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RESEARCH ON THE OPTIMAL PERFORMANCE OF TASKS UNDER REDUNDANCY CONDITIONS IN THE CASE OF A ROBOT WITH FIVE DEGREES OF FREEDOM
The fulfillment of programmed tasks by industrial robots in redundant conditions occurs when a robotic system has more degrees of freedom than would be necessary to accomplish the task. From the point of view of mechanical modeling of robotic structures, this translates into the fact that the number of motor coordinates of the robot is greater than would be necessary and sufficient to ensure the position and orientation of the robot's end effector required by the task. In such situations, there is the possibility of optimally performing the programmed task under the conditions of meeting certain criteria that may refer to better accessibility of the robot's workspace in the presence of obstacles, achieving a minimum in terms of movements at the level of the robot's motor axes or obtaining motor coordinate values as far as possible from the edges of their variation ranges. The paper analyzes the case of a robot with five rotation modules whose task is to ensure a trajectory imposed at the origin of the coordinate system attached to its end effector. The redundancy case is analyzed by imposing as an optimization criterion the achievement of a minimum of displacements at the motor axes level of the analyzed robot. Finally, the results obtained for the variation of motor coordinates in the case of a linear interpolation of the end effector movement are presented. -
ANALYSIS OF PINDA RESERVOIRS IN THE MOTOBA FIELD: METHODOLOGY, LITHOLOGICAL CHARACTERISTICS, AND POTENTIAL ZONES FOR WATER INJECTION
Marlin Agolo Monza Joël Etshekodi Lohadje Louis Lungu Malutshi Jean Manteke Kabay Franck Tondozi Keto Dan Tshimini Mutelu5/27/202510.51865/JPGT.2025.01.15engineering; technologyThe paper presents a comprehensive study of the Pinda reservoirs in the Motoba field, Democratic Republic of Congo (DRC), highlighting the methodology adopted to collect and process geological and petrophysical data. The analysis focuses on the LP1, LP2, and LP3 layers, with the primary objective of locating suitable areas for the establishment of injector and producer wells. The analysis includes data collection and processing, followed by result interpretation to create maps of isobaths and iso-values of hydrocarbons in place. Tools such as Grapher and ArcGIS were used to visualize this information. The history of the Motoba field, discovered in 1975, is also discussed, illustrating the challenges and successes of production, particularly the water injection initiated in 1998 and resumed in 2011. The regional geology and stratigraphy of the Pinda formation are described, emphasizing the lithological complexity and diagenetic processes that have influenced reservoir quality. The study reveals that the Lower Pinda reservoir is divided into sub-units, each exhibiting distinct petrophysical characteristics. Data on porosity, saturation, and clay content were analyzed to establish a dynamic model for evaluating hydrocarbons in place. The results from the isobath maps show significant depth variation, identifying favorable areas for well implantations, particularly in the Northwest, East, and Southeast. Recovery factor analyses and GOR indicate opportunities for resource optimization, with regions identified as suitable for water injection. In conclusion, this paper underscores the importance of a methodical approach in reservoir evaluation and strategic planning of injection operations in the Motoba field. -
PICK AND PLACE ROBOTIC CELL SIMULATION USING RoboDK SOFTWARE
Traian-Andrei Pană Gabriela Bucur5/23/202510.51865/JPGT.2025.01.14engineering; technologyn the era of advanced technology, the automation of industrial processes has become an essential element for improving efficiency and productivity. One of the most relevant aspects of this phenomenon is the development of robotic systems capable of performing repetitive tasks with a precision and speed superior to human ones. The objective of the work is the design and implementation of a robotic arm intended to perform the "pick and place" function, an essential process in numerous industrial fields, from product manufacturing to logistics and assembly. Pick and place involves picking an object from a specific location and placing it in another position. This task, while seemingly simple, is fundamental to the production flow of many industries. For example, in automobile manufacturing, components must be handled with care to ensure the quality and integrity of the final product. In logistics, robotic arms are used to organize goods in warehouses, reducing handling time and human error. The article presents the structure and operating specifications for the Doosan Robotics M1013 robot, as well as the RoboDK software, with its main features and application areas. After defining the specifications and selecting the hardware components, such as servo motors, sensors and control modules of the manufacturing cell, we move on to the design stage, where a 3D model of the robotic arm will be created. This model will allow the simulation of the robot's operation and the anticipation of possible problems, before the physical construction. -
RESEARCH ON THE KINEMATICS OF A MECHANISM WITH A TRIAD AS A COMPONENT
The structural approach to mechanisms from the perspective of component kinematic groups shows that as the class of component groups increases, the complexity of the mechanisms that contain them also increases. From this perspective, it is obvious that solving problems related to the kinematics of these mechanisms also becomes much more difficult to put into practice. In such cases, when mechanisms contain kinematic groups of a class greater than two, determining the analytical expressions of the parameters that establish the configuration of the mechanism during operation is extremely difficult. Therefore, in such cases, the development of some numerical calculation algorithms is indicated. The present paper analyzes the operation of a mechanism that has a triad as a component, in which one of the component kinematic joint is translational. To determine the variation of the position parameters, an iterative numerical calculation algorithm was developed and transposed into a computer program that allows the simulation of the functioning of the analyzed mechanism. Finally, the variation curves of these parameters over a kinematic cycle are presented, for a working configuration of the analyzed mechanism. -
MINI-FALL OFF TESTS AS A COST-EFFECTIVE TOOL FOR RESERVOIR CHARACTERIZATION AND DST DECISION-MAKING IN DEEPWATER CONVENTIONAL RESERVOIRS
Eghbal Motaei Tarek Ganat Seyed Mehdi Tabatabai5/19/202510.51865/JPGT.2025.01.12engineering; technologyThis research introduces a methodology employing Mini-Fall Off injection tests to enhance reservoir characterization and inform Drill Stem Testing (DST) decision-making in deepwater conventional reservoirs. The methodology begins with log-driven permeability estimation, which is corrected using mobility data from Wire Formation Tester (WFT) point results. Despite these corrections, uncertainties persisted regarding the dominant permeability, which is crucial for ensuring the minimum required deliverability for DST. To address these uncertainties and flow assurance challenges, the Mini-Fall Off injection test was employed to estimate permeability within the target flow zone unit of the conventional reservoir. This approach allowed for precise permeability assessment in specific zones, thereby enhancing the overall understanding of reservoir quality and well deliverability. The Mini-Fall Off test provided critical Value of Information (VOI) by revealing that the well deliverability did not meet the minimum required flow rates for DST, leading to the cancellation of DST and substantial cost savings. The application of Mini-Fall Off tests demonstrates a significant advancement in reservoir assessment strategies, offering a cost-effective and efficient alternative to traditional methods. By integrating log-driven permeability data with WFT-derived mobility data and employing the Mini-Fall Off test, the methodology provides a comprehensive framework for reducing uncertainties and optimizing resource allocation in the oil and gas industry. Furthermore, this technique underscores the importance of VOI in data acquisition and decision-making processes throughout the asset lifecycle, from exploration to development. The results of this study highlight the potential for Mini-Fall Off tests to become a standard practice in reservoir characterization, particularly in deepwater conventional reservoirs where cost and efficiency are paramount. This work presents a novel, cost-effective approach to obtaining accurate reservoir characterization, thereby demonstrating its potential to optimize operational efficiency and resource management in the oil and gas sector. -
THE IMPACT OF FEATURE SELECTION AND DATA PRE-PROCESSING ON ML MODELS
Alexandru-Carlos Vlad Emilian Marian Iovanovici5/11/202510.51865/JPGT.2025.01.11engineering; technologyThis research aims to identify issues with datasets that affect the training of machine learning models. The paper demonstrates the impact of feature processing on the model evaluation metrics. Initially, the paper evaluates unprocessed categorical features based on customized rules. The results of the seven evaluated algorithms show very low metric values. The demonstration is conducted on a dataset with 16 features for predicting depression among students. The dataset consists of 7,022 records. The issue of depression was chosen because it involves many features, which facilitate the analysis of the correlations between them. Moreover, the large number of features and records allowed for the analysis of generalization capacity by training on different dataset scenarios for all seven algorithms. The demonstration shows that data pre-processing generates better results when the inputs are exclusively numerical. Subsequently, the research demonstrates the importance of individually analyzing the contribution of each parameter within the model. The study encompasses three categories of tests, which are implemented using the ML.NET framework in the C# programming language. -
RESEARCH ON THE GENERATION OF INTERPOLATED MOVEMENTS IN THE CASE OF A ROBOTIC MECHANISM WITH ANTHROPOMORPHIC STRUCTURE
The implementation of robotic system commands, along with the design of the component mechanisms, contributes to their correct functioning while performing various tasks. In this sense, the precise generation of interpolated movements at the level of the end effectors from the component of robotic mechanisms is particularly important in the optimal performance of tasks in many industrial applications. Compared to the point-to-point commands, the interpolated commands are intended to pilot the robotic mechanisms so that their final effectors follows an imposed trajectory in the operational space of the robot with an imposed hourly law. The paper presents a method for generating interpolated movements in the case of a robotic system whose active mechanism has an anthropomorphic structure. The presented method uses the differential model of the analyzed robotic system. The introduced interpolation is linear, and the hourly law used is in the form of a polynomial of the fifth degree. Within the simulations performed, the four possible configurations of the anthropomorphic robotic mechanism that allow the achievement of the imposed task were highlighted. Finally, for one of these configurations, the variation curves of the coordinates corresponding to the actuation motors for a certain task are established. -
CONTRIBUTION TO THE GEOLOGICAL AND PETROLEUM STUDY OF THE WEST-CONGOLIAN BASIN – CASE OF CARBONATES IN THE KITOBOLA REGION IN CENTRAL CONGO, D.R. CONGO
Ravely Nsieto Lusakueno Saint Bob Nsasa Bazona César Tambashie Okitafumba Gardiner Samba Vanga Grace Tshimanga Kamba Anselme Mavambou Mbadou4/30/202510.51865/JPGT.2025.01.09engineering; technologyPrevious studies carried out in the West-Congolian basin have highlighted potential formations that could play a major role in a petroleum system. In order to complete and enrich the geological and petroleum dossier of the said basin, a field trip to the Kitobola locality in the province of Central Congo was necessary to sample, analyze and describe the carbonate formations that outcrop there, in order to detect their importance from a petroleum point of view by describing and analyzing their mineralogical characteristics, and geochemical characteristics of these rocks, as well as evaluating their basic petrophysical parameters, notably porosity and permeability, in order to determine the role they might play in a petroleum system. Samples were sent to CRGM laboratories for petrographic, petrophysical and geochemical analyses, which revealed the presence of limestones (mudstones, wackestones and pelmicrite) with low porosity ranging from 1.18 to 1.49% and near-zero permeability between 0.2 and 0.5 mD. Geochemical analyses revealed a TOC ranging from 0.9 to 1.3 and high proportions of calcium oxide CaO associated with the limestones. As a result, these formations cannot be used as reservoirs, but rather as blankets, given their low porosity and near-zero permeability. On the other hand, they would make excellent source rocks in a petroleum system, given their very satisfactory TOC values. This article provides new information on the intrinsic characteristics (petrographic, petrophysical and geochemical) of the carbonate formations outcropping in the Kitobola region of the West Congolian Basin, while also highlighting potential source rocks or blankets. -
A CONCRETE DROPOUT NEURAL NETWORK FOR SHEAR SONIC LOG PREDICTION
Ephraim Ojoajogu Enemali Sulaiman Alhaji Dodo Ibrahim Ibraheem Salaudeen Mahmud Abubakar Abdulmalik4/22/202510.51865/JPGT.2025.01.08engineering; technologyAssessing the risk associated with drilling and wellbore stability studies requires the shear sonic log. These logs apart from distinguishing formation fluid from lithology are needed to obtain geo-mechanical rock parameters required for the safe design of rock fracturing. Although sonic logs are of great importance, they are usually not obtained due to the limiting cost of acquisition. Neural networks have been used to generate these logs to save cost, but these networks are prone to overfitting. The dropout rate has been proposed to tackle this problem, however selecting the optimum dropout probability rate can be challenging manually or expensive computation wise. This research therefore investigated concrete dropout, a dynamic technique for adapting the dropout rate of a neural network to the data. The concrete dropout technique was applied to an artificial neural network (ANN) and a convolutional neural network (CNN) model to predict the shear sonic log with Monte Carlo simulation. Comparison was also made with the deterministic ANN and CNN models which had no dropout layers added and a Bayesian-optimized multilayer perceptron (MLP) model. These models were trained and validated with four (4) wells from the Volve field, using features with the highest correlation. The Concrete dropout ANN was found to outperform both the deterministic versions and the MLP model with R2, RMSE, MSE and MAE scores of 0.9548, 3.6415, 2.4433 and 0.0179 respectively. The neural networks built in this study showed an enhanced predictive performance with concrete dropout addition over the networks with no dropout added, showing that the technique was able to adapt the dropout rate to fit the nature of data and improve performance, which finds great application in real time deployment. The findings of this study also proposed a cost-effective way of sampling and averaging multiple outputs from a single neural network model, leading to enhanced predictive performance as the addition of concrete dropout allowed the network output distributions rather than point predictions. -
DETERMINATION OF AREAS SUITABLE FOR THE DETECTION OF GEOLOGICAL STRUCTURES IN THE LOKORO SUB-BASIN USING THE MAGNETIC METHOD
Chadrack Lulaila Mongoto Franck Tondozi Keto Dody Maponda André Yelembangu Ngwey Yves Bolokole Mpehenzale4/18/202510.51865/JPGT.2025.01.07engineering; technologyThis work focuses on identifying potential areas in the Lokoro sub-basin, a strategic region located in the south-western part of the central Congolese basin. Covering an area of 51,759 km², this sub-basin encompasses the Mai-Ndombe province. Mapping the geological structures of this area is essential for highlighting hydrocarbon potential, a crucial aspect for future tenders. The study is based on the processing and analysis of magnetic data collected in the Lokoro sub-basin. The magnetic method, which evaluates the distortions of rocks buried in the earth's crust, enables the interpretation of magnetic anomalies linked to subsoil susceptibility. This approach provides clues to geological formations likely to accumulate hydrocarbons, offering valuable insight to prospectors. The anomalies detected may indicate the presence of geological structures favorable for hydrocarbon accumulation. By deepening our understanding of the geological structures of the Lokoro sub-basin, this research facilitates the exploration and exploitation of petroleum resources in this promising region. In sum, this study is a crucial step in revealing the hidden potential of the Lokoro sub-basin and in guiding petroleum exploration efforts in this resource-rich area. -
TECHNO-ENVIRONMENTAL PLANNING OF AN EXPLORATION CAMPAIGN IN PROTECTED AREAS – THE CASE OF THE BOMBO-LUMENE HUNTING ESTATE AND RESERVE (D.R. CONGO)
Prosper Aida Monkenya Osée Mayinga Mayinga Jacques Moliba Bakanza Shams Mbudi Diambu Jonathan Nsimba Kanga Louis Ekaa3/3/202510.51865/JPGT.2025.01.06engineering; technologyPlanning is a strategic approach that determines the orientations and objectives of a society in relation to the evolution of its territory. It serves as an appropriate tool for promoting sustainable development. In this context, the primary aim of this study was to design an exploration campaign in protected areas to minimize the potential risks that this initiative could pose to the well-being of local populations. Furthermore, it is crucial to establish new perspectives that could assist exploration engineers in conducting their various studies under normal and safe conditions. Through the techniques, methods, and tools applied during this study, we have discovered a central structure in our study area, which we consider a significant element that could certify the presence of a hydrocarbon deposit. Planning thus proves to be one of the most effective solutions for successfully carrying out an exploration campaign in protected areas, with the objective of minimizing the negative impact on the targeted site. By integrating appropriate management strategies and involving stakeholders, we can ensure a harmonious coexistence between exploration activities and environmental preservation. -
APPLICATION OF PHOTO-INTERPRETATION AND REMOTE SENSING TECHNICS FOR GEOLOGICAL MAPPING – CASE OF THE REGION OF ZAGORA, MOROCCO
Emmanuel Biba Kalengo Arice Ingrid Sogui Ilias Kacimi Divin Kuniema Boniface Lumpungu2/27/202510.51865/JPGT.2025.01.05engineering; technologyThe current era of digital technology has opened up endless possibilities for exploring and understanding our world. Among these advances, Geographic Information Systems (GIS) and remote sensing have revolutionized our ability to study and interpret geological phenomena without being physically present on the ground. The objective of this study therefore aims to use these tools to develop a more in-depth understanding of the geology of the Zagora province, a region of Morocco, using Landsat 9 images to produce a detailed geological map of the region characterized by a diversity of geological formations thus coupling the photo-interpretation approach and the Random Forest supervised classification algorithm. The results highlighted lithostratigraphic units, hydrographic networks and faults with great precision. The integration of these two methods provided complementary information, improving the accuracy and detail of the geological mapping of the area and highlights the importance of remote sensing tools and GIS for geological analysis and resource management. -
IMPROVEMENT OF THE DRINKING WATER SUPPLY NETWORK BY STRENGTHENING PRODUCTION USING DRILLING TECHNICS – CASE OF THE MOKALI QUARTER IN THE KIMBANSEKE TOWNSHIP, DR CONGO
Emmanuel Biba Kalengo Glory Munkama Ley Luyi Mpata Samuel Diangitukulu Leonard Kabeya Mukeba Yakasham2/24/202510.51865/JPGT.2025.01.04engineering; technologyEveryone is aware that access to or the search for drinking water is one of the major problems that bother all of humanity. The quarter of MOKALI, in the Kimbanseke township in the Democratic Republic of Congo, also faces challenges in ensuring an adequate supply of drinking water. Current infrastructures, designed several decades ago, are struggling to meet the growing demands of the population. This study focuses on improving the drinking water supply network by strengthening water production through the implementation of advanced drilling technics. Recent studies have highlighted the effectiveness of drilling as a method of accessing deeper aquifers, less prone to contamination and more sustainable over time [1]. In Mokali quarter, the integration of these techniques has not only improved water availability, but also reduced reliance on surface water sources, which are often polluted and unreliable [2],[3]. The use of rotary drilling technology, in particular, has enabled the extraction of high-quality groundwater from depths previously considered inaccessible [3]. The implementation of these technics was coupled with the modernization of the water distribution network, ensuring that the increase in production capacity directly translates into better access for the local population [3],[4]. The results of this study indicate a significant reduction in water shortage incidents and an overall improvement in public health outcomes in Mokali quarter. The success of this project suggests that similar strategies could be applied effectively in other regions facing comparable challenge. -
OCCUPATIONAL RISK ASSESSMENT FOR CHEMICAL LABORATORY STAFF WORKING IN CHROMATOGRAPHY – SAMPLING – WASTEWATER ANALYSIS WITHIN S.C. ROMPETROL QUALITY CONTROL LLC
An effective Occupational Health and Safety risk assessment is crucial for identifying potential hazards in the workplace and implementing measures to minimize harm. By evaluating risks, organizations can create a safer environment for employees, ensuring compliance with safety regulations and enhancing overall productivity. Regular assessments foster proactive safety culture and prevent accidents before they occur, ultimately promoting employee well-being and reducing organizational liabilities. This article aimed to analyze and assess the risks of injury and illness, identify the preventive and protective measures necessary to ensure a healthy and safe working environment, so as to highlight the importance of assessing the occupational risks associated with the jobs of chemical laboratory workers within the investigated company, focusing in particular on chromatography, sampling and waste water analysis activities. The results of the research facilitated the adoption of the most suitable measures to mitigate the risks highlighted as being located in the field of unacceptability. Through the careful and systematic examination of the activities carried out by chemical laboratories and the identification of potential hazards and related risks, practical and effective solutions to protect workers safety and health were already implemented. -
ASSESSMENT AND REDUCTION OF ENVIRONMENTAL RISKS RELATED TO THE TRANSPORT, STORAGE AND DISTRIBUTION OF PETROLEUM PRODUCTS IN KINSHASA – A SEP-CONGO CASE STUDY
Gracias Kingombe Manianga Albert Mbosei Lobota Alfred Ngangura Amisi Denis Esongo Lomonde Augustin Bangama Kabongo Jean Iyolo Lungembo2/2/202510.51865/JPGT.2025.01.02engineering; technologyAssessing and managing environmental risks in the oil industry is crucial to ensuring operational safety and corporate sustainability. In the case of Sep-Congo in Kinshasa, where petroleum product transport, storage and distribution activities are intensive, a proactive approach is required. Petroleum products present hazards such as toxicity, flammability and volatility, requiring rigorous risk identification. Dynamic risk assessment methods, such as DyPASI and DRA, enable potential accident scenarios to be updated in real time by incorporating data on past incidents and monitoring safety indicators. These approaches provide a visual representation of risks and help to make informed decisions to minimize hazards. By integrating these methodologies, Sep-Congo can strengthen its safety measures and ensure effective operation in the face of environmental challenges. -
COMPLIANCE WITH OCCUPATIONAL SAFETY PRACTICES AMONG COOKING GAS REFILL STATION ATTENDANTS IN EFFURUN AND ENVIRONS, DELTA STATE, NIGERIA
Joyce Omuwa Okologume Godwin Asibor1/17/202510.51865/JPGT.2025.01.01engineering; technologyTo minimize the risk of accidents and injuries, it is essential to assess how safety protocols are being adhered to in the workplace. Many attendants working at stations that refill cooking gas in the gas retail sector are found in this study location, Delta State of Nigeria. Such workers are exposed to numerous risks that can lead them to get injured, gas leakage, and fire. This study assessed the compliance of cooking gas refill station attendants in Effurun and its environs in Delta State with occupational safety practices. The study used cross-sectional and descriptive designs such as observations and interviews for qualitative data collection. The data was presented quantitatively as numerical values, from which statistical inferences were drawn. The study found that knowledge of safety practices among cooking gas refill station attendants in Effurun and its environs was generally good, especially regarding personal protective equipment (PPE) usage (85.4%), fire extinguishers (100%), and familiarity with workplace safety practices (95.8%). The study's results showed statistically significant associations and relationships between the respondents' age with awareness and knowledge (p=0.041) and duration of work time (p=0.018). Additionally, the general practice of safety measures was found to be high. However, some cooking gas refill stations had poor design and siting, which could increase the vulnerability to occupational accidents within the stations. To improve compliance, assessing occupational safety practices should be a top priority. This will positively influenced organizational improvement approaches and hazard management at cooking gas refilling stations in Nigeria. -
NUMERICAL MODELING OF CONVECTIVE AND MOLECULAR TRANSPORT MECHANISMS OF HYDROGEN IN DEPLETED GAS RESERVOIRS
Rami Doukeh Timur-Vasile Chiș Laura-Ștefania Păun Alexandra Mohanu Mihai Adrian Albulescu Doru Bogdan Stoica12/7/202510.51865/JPGT.2025.02.15engineering; technologyThis study presents a numerical investigation of hydrogen injection and migration in a depleted natural gas reservoir, integrating convective and molecular transport mechanisms. A 2D simulation model based on real geological data was developed using a discretized mesh and realistic operational parameters, including 15 active injection wells each delivering 250,000 Sm³/day. Four main operational scenarios were analyzed: continuous injection over 120 days and three subsequent cycles incorporating post-injection relaxation intervals of 5, 10, and 15 days. Results show that continuous injection leads to stable reservoir behavior, with progressive pressure buildup and efficient gas accommodation. However, the introduction of relaxation periods reveals improved gas redistribution and saturation homogeneity, especially in the 15-day case, where hydrogen diffusion becomes significantly more uniform across the reservoir volume. Despite minimal differences in global pressure between relaxation scenarios, only the extended relaxation phase ensures optimal pore space utilization and mitigates localized overpressure risks. These findings emphasize the critical role of tailored injection-relaxation cycles in maximizing hydrogen storage efficiency and maintaining reservoir integrity, contributing to the optimization of underground hydrogen storage strategies in depleted gas formations. -
EVALUATION OF THE CONTRIBUTION OF HYDRAULIC FRACTURING OF THE CENOMANIAN RESERVOIR TO THE PRODUCTIVITY OF WELLS IN THE MAKELEKESE FIELD, DEMOCRATIC REPUBLIC OF CONGO
Emmanuel Balu Phoba Dona Kampata Mbwelele Dieudonné Yenga Zidiaposo André Yelembangu Ngwey Jean Iyolo Lungembo12/5/202510.51865/JPGT.2025.02.14engineering; technologyThe Democratic Republic of Congo, with its Coastal Basin, represents a major source of liquid and gaseous hydrocarbons. This study explores the use of hydraulic fracturing as a method to enhance production in the Makelekese-08 (MS-08) and Makelekese-10 (MS-10) wells within the Makelekese field. As many oil fields in the region mature, it becomes essential to adopt advanced techniques to maximize the extraction of remaining reserves. The primary objective of this research is to assess the impact of hydraulic fracturing by analyzing fracture propagation and its influence on reservoir productivity. Specific objectives include characterizing the lithological and petrophysical properties of the Cenomanian reservoir, including porosity and permeability. Providing a detailed description of the fracturing treatment, including the fluids, additives, and injection parameters. Analyzing production variations before and after fracturing, demonstrating increases of up to three times the initial production. This study aims to fill a gap in quantitative assessments and local geological data regarding hydraulic fracturing in the Coastal Basin. By integrating geological, petrophysical, and operational analyses, it offers significant insights into reservoir stimulation and its effectiveness in enhancing hydrocarbon recovery. -
PIPE SORTING SYSTEM – FROM DESIGN TO IMPLEMENTATION
Bogdan Cojocaru Cristina Popescu Gabriela Bucur Emil Gocan12/3/202510.51865/JPGT.2025.02.13engineering; technologyThis paper presents the design, development, and validation of an automated pipe sorting system built as a small-scale prototype integrating mechanical structures, infrared sensing, and Arduino-based control. The project follows the complete engineering workflow, beginning with concept generation and functional decomposition, continuing with iterative prototyping, subsystem testing, and final integration. The system performs pipe transportation, length measurement through timed sensor interruption, and robotic sorting using a 6-DOF arm. Emphasis is placed on experimental calibration, modular programming, and problem-solving strategies that address challenges such as sensor sensitivity, mechanical alignment, and communication constraints. Results show that the prototype achieves consistent classification for four pipe lengths, demonstrating that low-cost components and systematic testing can yield a reliable model of industrial automation. The project can also be expanded diversifying the types of pipes that can be sorted, increasing measurement accuracy, as well as using AI techniques in decision-making mechanism. The study highlights the educational value and scalability potential of modular, resource-efficient automation design. -
THE INFLUENCE OF DIGITALISED MAINTENANCE DATA ON OPTIMISING PREDICTIVE MAINTENANCE IN THE SOUTH AFRICAN PETROCHEMICAL INDUSTRY
This study investigates the impact of digitalising maintenance data on the optimisation of predictive maintenance practices within the South African petrochemical industry. A conceptual model framework was developed through a systematic literature review. The framework explored the relationship between current maintenance practices, centred around Computerised Maintenance Management Systems (CMMS), and the projected benefits of digitalised predictive maintenance. A questionnaire was administered to maintenance and operations personnel to determine the status of maintenance data usage, perceptions of digitalisation benefits and organisational readiness indicators within the South African petrochemical industry. Findings indicate that while maintenance data are already utilised for operational decisions, much of it is manually collected and input into CMMS platforms. There is a clear opportunity for digital transformation, even though the supporting infrastructure remains partially developed. The results affirm that digitalising maintenance data can significantly improve predictive maintenance capabilities and decision-making effectiveness. Recommendations highlight the need for further research into how maintenance personnel, especially those from older or less technologically exposed cohorts, can be supported in embracing digital tools. The study’s managerial implications underscore the necessity for leadership to address human-centric challenges when deploying data-driven maintenance strategies and to foster a culture that enables digital transformation in maintenance environments. -
COMPREHENSIVE CHARACTERIZATION OF RESERVOIR VARIABILITY WITH THE ROCK TYPING METHODOLOGY: A CASE STUDY OF FIELD F-A, BREDASDORP BASIN, OFFSHORE SOUTH AFRICA
Omar Derder Mimonitu Opuwari11/19/202510.51865/JPGT.2025.02.11engineering; technologyThis research categorizes the sandstone reservoir rock type (PRT) and flow units (FU) by the inaugural effort to amalgamate Winland and MLP studies for the classification of flow units in the Bredasdorp Basin, Offshore South Africa. Within a system of structural and stratigraphic traps lies the upper shallow marine sandstone reservoir, which is the primary target. Shelf and fluvial sandstones are the secondary targets. Shallow marine and shelf sandstones compose quartz-rich, mature reservoirs featuring stable, laterally extensive flow units, whereas fluvial sandstones are classified as less mature lithic types with more heterogeneous flow units influenced by geometry and diagenesis. This study used cores and well logs data from five different wells provided by the Petroleum Company of South Africa (PetroSA). The quantitative identification and classification of rock types and flow units within the reservoir are accomplished by integrating standard and specialized core analysis with a comprehensive core description. The reservoir rocks mostly comprise shale, lithic, siltstone, and sandstone, varying from very fine to medium grain size. Windland R35 analysis. Modified Lorenz plotting, statistical clustering, lithofacies identification, flow capacity evaluation, and storage capacity evaluation was used to classify the rock types and five flow units in the Bredasdorp reservoir. Low quality reservoir is represented by the first group, which includes PRT5 and Nano-port types. Intermediate qualities reservoirs are represented by PRT4 and PRT3, Micro-Meso port types, which include shale, siltstone, and very fine to fine sandstones. High quality reservoirs, including PRT1 and PRT2, Meso-Mega port types, also composed of fine to medium sandstones. The litho-facies (SM4) demonstrate the largest porosity exceeding 17.5 %, permeability surpassing 200 mD, and superior flow unit characteristics with pore throat size more than 20 µm in comparison to the other petrofacies. The litho-facies (SM3) demonstrate relatively high porosity and permeability, while litho-facies (SM2) demonstrate moderate values when compared to litho-facies (SM3). Conversely, the lithofacies of shallow marine (SM1) and fluvial (F) environments demonstrate the lowest porosity, below 13%, permeability under 1.5 mD, and a minimal pore throat of 1 µm among the four litho-petrofacies found in the deposits. -
SEDIMENTARY BASINS AND HYDROCARBON RESOURCES ON A GLOBAL SCALE: INSIGHTS FROM ROMANIA
Daniela-Doina Neagu Elena-Rodica Stoica-Negulescu11/19/202510.51865/JPGT.2025.02.10engineering; technologyGlobal economies and infrastructure still depend heavily on petroleum-based products. Despite significant initiatives aimed at transitioning to renewable energy, the oil and gas sector continues to play a key role in shaping both the global economy and political landscape. Organizations like the U.S. Energy Information Administration, the U.S. Geological Survey, and the BP Statistical Review of World Energy have gathered extensive data reflecting this ongoing reliance. Oil reserves are not uniformly distributed across the globe. The Middle East holds the majority of the world's confirmed reserves, followed by countries such as United States and the Canada, as well as regions in Latin America, Africa, and the former Soviet states. Hydrocarbon deposits of a basin, or even part of it, led to the concept of an oil province that is mainly based on the analysis of geological setting. The defining of a petroleum system or province considers several criteria: geographic criteria (especially the extent and volume of rocks of interest); geological criteria (type of basin and its classification, stratigraphy) and petroleum criteria (potential and volume of discoveries, type of reservoir). After classifying giant oil fields according to basin and tectonic setting, several conclusions were drawn and a hierarchy was established: passive continental margins facing large ocean basins host of about 31% of giant deposits; continental rifts and overlying sag basins contain about 30% of the world's largest oil fields; the final collision belts between two continents form major basin that contains for approximately 24% of global giant fields; and continental arcs at convergent plate boundary, strike-slip systems, and subduction margins together host 15% of the world's giant fields. Looking ahead, the direction of oil exploration will be influenced not only by the quantity and type of resources available in the mentioned areas, but also by geopolitical dynamics and technological advances. Improved seismic imaging and detailed reservoir analysis are expected to play a greater role, especially in the development of unconventional resources such as tight oil, tight gas and shale formations. Romania can be considered the second largest oil producer and the third largest gas producer in the EU. Most known oil and gas fields in Romania have reached maturity, but the exploration of deeper structures has led to several recent discoveries. Current research techniques based on high-resolution seismic images correlated with a complex geophysical well investigation are expected to reveal new hydrocarbon accumulations both onshore areas (in orogenic or foreland type basins) and offshore in the western Black Sea basin. In order to have a clear picture of the development directions for oil and gas fields, this study analyzed data and statistics provided by specialized institutions and literature, synthesizing them in a clear and suggestive way possible according to the diagram below. The paper represents a first step in guiding future exploration efforts. -
GEOPRESSURE PREDICTION AND INTENSITY CHARACTERIZATION BASED ON FUZZY INFERENCE SYSTEM IN BARBADOS FIELD OF THE NIGER DELTA, NIGERIA
Olabanji Adeolu Ojo Oluwatoyin Abosede Oluwadare Jeremiah Ademola Balogun Kehinde Olubunmi Akinterinwa11/12/202510.51865/JPGT.2025.02.09engineering; technologyIn the paper we present a method of characterizing overpressure intensity in an oil field from wireline log with fuzzy inference system using well logs from Barbados field in the Niger Delta area of Nigeria. The method employs pressure coefficients obtained from the ratio of the pore pressure and the hydrostatic pressure as input into the fuzzy system. The lithostatic and hydrostatic pressures were derived from sonic and density log equations while the Hunt and Shi classifications were used to characterize the overpressure intensity, although with a slight modification. The plot of sonic log with depth in the wells followed a typical stepped-tiered configuration having a maximum of three episodes of abnormal pressure. The distribution of pressure coefficient (PC) increases from the left flank to the right flank of the field. Mild overpressure with PC values of 1.28, 1.35 and 1.53 were observed at shallowest depth and 1.33, 1.36 and 1.32 at intermediate depths. Strong overpressure with maximum PC values of 2.04, 2.46, 3.60 and 3.75 were observed in Barbados wells 1, 2, 3 and 4 respectively at greater depths. The result from this study has proven to be a dependable tool in the characterization of overpressure intensity as well as serve as a guide for predicting overpressure behavior in adjacent areas. Further work on pressure coefficient (PC) computation in the vicinity of well kicks, caving, loss of drilling mud, or possibly full blowout is welcomed from other workers. -
EVALUATION OF THE GEOCHEMICAL AND PETROGRAPHIC CHARACTERISTICS OF THE INKISI FORMATION IN THE SEDIMENTARY BASIN OF THE CENTRAL BASIN
Jean Iyolo Lungembo Joël Etshekodi Lohadje Serge Diemo Dona Kampata Mbwelele Adalbert Makutu Mangwayaya11/5/202510.51865/JPGT.2025.02.08engineering; technologyThe Congo Craton, located in the central depression, hosts an interior sedimentary basin covering over 800,000 km², subdivided into four intracontinental sub-basins: Busira, Lokoro, Lomami, and Bushimayi. The formation of this vast Neoproterozoic basin results from an initial stretching of the lithospheric crust followed by thermal subsidence, corresponding to the rebalancing of the lithosphere during the Pan-African orogenic cycle. This tectonic activity led to the formation of pull-apart basins, reflecting the generalized subsidence of the craton in the central depression. The general lithostratigraphic column of the basin comprises five sedimentary sequences, among which the Inkisi sandstone formation is central to our study as a potential reservoir rock. The analysis of the deposits and sedimentary evolution of this formation is essential for determining its porosity and permeability, key characteristics for a hydrocarbon reservoir. The choice of the southwestern part of the basin, specifically on the outskirts of the provincial city of Kinshasa, is motivated by the accessibility of this rock and the absence of in-depth studies in this area. This research aims to enhance the understanding of the geological characteristics of the Inkisi formation, particularly in a context that has never been studied in depth. Geochemical analysis and the assessment of the alteration state of the rocks will provide unprecedented information on their petrographic potential. By highlighting aspects such as porosity and permeability, this study offers new perspectives for oil exploration in the central depression. Despite the importance of the Inkisi formation, previous research has often overlooked a detailed analysis of its petrographic and sedimentary characteristics. Few studies have been conducted on the southwestern portion of the basin, particularly regarding geochemical properties and the alteration state. This study aims to fill these gaps by providing a comprehensive and integrated analysis that could serve as a basis for future research and the exploitation of natural resources in the region. -
AI-COORDINATED SELF-SUSTAINING FLOATING PLATFORM FOR COMPLETE ECOLOGICAL CONVERSION OF SUBMARINE PETROLEUM WASTE
This paper presents an integrated system comprising marine platform engineering, thermal processing technologies, and AI-based automation for ecological conversion of submarine petroleum waste into exportable electrical energy. The system combines a floating platform adapted from offshore wind technology, established thermal processing methods, and AI coordination to achieve autonomous operation. The platform engineering utilizes proven offshore wind stabilization principles for optimal performance in shallow water conditions (50-200m depth). The thermal processing integrates CO₂-protected pyrolysis with oxygen-enhanced gasification, while thermoelectric conversion systems capture energy across all temperature ranges. The AI coordination system manages real-time process optimization and autonomous operation. Building upon established research in petroleum waste treatment, this integrated approach addresses the complete technological chain from platform stability to energy export. Initial calculations indicate high thermal utilization efficiency with energy self-sufficiency plus surplus energy available for export. The platform maintains stable operation in marine conditions including waves up to 15m height and winds up to 30 m/s, demonstrating 95% operational uptime during severe weather events.
ISSN print: 2734–5319
ISSN online: 2972–0370
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