Low Pressure Oil Research Articles

Design and realization of compressor data abnormality safety monitoring and inducement traceability expert system.

Centrifugal compressors are widely used in the oil and natural gas industry for gas compression, reinjection, and transportation. Fault diagnosis and identification of centrifugal compressors are crucial. To promptly monitor abnormal changes in compressor data and trace the causes leading to these data anomalies, this paper proposes a security monitoring and root cause tracing method for compressor data anomalies. Additionally, it presents an intelligent system design method for fault tracing in compressors and localization of faults from different sources. This method starts from petrochemical big data and consists of three parts: fault dynamic knowledge graph construction, instrument data sliding fault-tolerant filtering, and the fusion and reasoning of fault dynamic knowledge graph and instrument data variation monitoring. The results show that this method effectively overcomes the problems of false alarms and missed alarms based on fixed threshold alarm methods, and achieves 100% classification of two types of faults: non starting of the drive machine and low oil pressure by constructing a PCA (Principal Component Analysis)-SPE (Square Prediction Error)-CNN (Convolutional Neural Network) classifier. Combined with dynamic knowledge graph and NLP (Natural Language Processing) inference, it achieves good diagnostic results.

Hybrid Huff-n-Puff Process for Enhanced Oil Recovery: Integration of Surfactant Flooding with CO2 Oil Swelling

With increasing energy demands and depleting oil accessibility in reservoirs, the investigation of more effective enhanced oil recovery (EOR) methods for deep and tight reservoirs is imminent. This study investigates a novel hybrid EOR method, a synergistic approach of nonionic surfactant flooding with intermediate CO2-based oil swelling. This study is focused on the efficiency of surfactant flooding and low-pressure oil swelling in oil recovery. We conducted a fluorescence-based microscopic analysis in a microchannel to explore the effect of sodium dodecyl sulfate (SDS) surfactant on CO2 diffusion in Texas crude oil. Based on the change in emission intensity of oil, the results revealed that SDS enhanced CO2 diffusion at low pressure in oil, primarily due to SDS aggregation and reduced interfacial tension at the CO2 gas–oil interface. To validate the feasibility of our proposed EOR method, we adopted a ‘reservoir-on-a-chip’ approach, incorporating flooding tests in a polymethylmethacrylate (PMMA)-based micromodel. We estimated the cumulative oil recovery by comparing the results of two-stage surfactant flooding with intermediate CO2 swelling at different pressures. This novel hybrid approach test consisted of a three-stage sequence: an initial flooding stage, followed by intermediate CO2 swelling, and a second flooding stage. The results revealed an increase in cumulative oil recovery by nearly 10% upon a 2% (w/v) solution of SDS and water flooding compared to just water flooding. The results showed the visual phenomenon of oil imbibition during the surfactant flooding process. This innovative approach holds immense potential for future EOR processes, characterized by its unique combination of surfactant flooding and CO2 swelling, yielding higher oil recovery.

Optimizing Oil Distributor Port for Low-Pulsation Cam-Lobe Hydraulic Motors

High-end equipment always operate in low-speed and heavy-load working environments, highlighting the need for cam-lobe hydraulic motors with excellent speed stability (< 1 r/min) and ultrahigh-power rotary output (> 1 MW). The successful operation of cam-lobe hydraulic motors relies on the circulation supply of high- and low-pressure oil. However, the switching between high-/low-pressure oil controlled by the oil distributor inevitably causes an obvious pressure impact and speed pulsation, which directly reduces the speed stability of hydraulic motors. Therefore, an optimization design approach for the oil distributor port is proposed to minimize the speed pulsation of cam-lobe hydraulic motors. In the proposed approach, a simulation model that links the oil distributor port structural parameters with the hydraulic motor speed pulsation was developed to clarify the effect of the oil distributor structural parameters on speed pulsation. Then, an orthogonal analysis method was used to identify the optimized oil distributor port structural parameters while minimizing the hydraulic motor’s speed pulsation as much as possible. Finally, several experiments were conducted to validate the effectiveness and accuracy of the proposed optimization design approach. The experimental results indicate that the pulsation rate of the hydraulic motor equipped with the optimized oil distributor was 62.5% lower than that of the original motor at a working pressure of 25 MPa, which is consistent with the simulation results using the proposed optimization design approach. The findings of this study offer a feasible and effective approach to guide the design optimization of the oil distributor port for low-pulsation hydraulic motors.

Design and analysis of a novel rotary inertance hydraulic converter with the continuous controlling turntable

The inertance hydraulic converter is an energy-efficient hydraulic component, its output efficiency and dynamic performance are seriously affected by the switched valve. This paper proposed an innovative a rotary inertance hydraulic converter (RIHC), which uses a continuous controlling turntable to determine the ratio of the high pressure oil and the low pressure oil to change the output energy, instead of the discrete controlling of the switched valve. The working principle and mechanical design of the RIHC are described, and mathematical models are established. The effects of the key variables on energy efficiency are evaluated using numerical analysis. The operating performance is analyzed based on simulation, and a control strategy to achieve stable system output is proposed. The results provide a foundation for theoretical research and practical application of the novel RIHC.

STRUCTURAL OPTIMIZATION OF JET PUMP BASED ON BP NEURAL NETWORK

With the increasing drilling depth, problems follow, such as the lifting height of the liquid in the well and increased pump operation. Therefore, improving the production efficiency of deep wells is a hot spot in the current oil drilling and production industry. This paper designs a new jet pump that can be mined for high and low-pressure oil layers according to the oil wells’ inter-layer contradiction. The FLUENT software is used to simulate the new jet pump, analyze the pump efficiency factors of the jet pump and the physical properties of the fluid, and the BP neural network is used to optimize the structure of the jet pump. The results show that the maximum pump efficiency of spout distance, duct diameter, duct distance, and spread angle is 2.61-5.22 mm, 6.393-8 mm, 42.5-53.2 mm, and 6-9°, respectively. The best spout distance, duct diameter, duct distance, and spread angle are 2.74 mm, 6.80 mm, 46.5 mm, and 7.4°after being optimized by the BP neural network model presented in this paper and the optimized pump efficiency is improved by 9.45%.

A low density micro-foam workover fluid for deep and ultra-deep wells with low-pressure coefficient and high inorganic salt

The leakage of workover fluid often occurs in the workover operation of low-pressure oil wells due to the pressure coefficient is generally less than 1.0, which leads to the slow recovery of oil well productivity or even failure to recover. The performance of workover fluid will directly affect the degree of damage and production of oil and gas wells. In this paper, SBX (Water+0.5% sodium dodecyl sulfate SDS+0.5% dodecyl dimethyl betaine BS-12 +0.7% polyurethane thickener XH-ZC-5) has been found to be a very effective temperature-resistant and salt-resistant low-density micro-foam workover fluid. Warning Blender experimental results showed that the half-life and foaming volume of SBX were 3084 min and 360 mL, respectively. Microscopic experiments demonstrated that the particle size of the foam gradually became smaller and the foam became denser with the increase of foam stabilizer XH-ZC-5 concentration. The foam stabilizing mechanism of XH-ZC-5 was mainly to keep the foam in a lower surface energy state by reducing the surface tension, and to increase the liquid viscosity of the foam to maintain the strength and elasticity of the liquid film. Besides, the tolerance of SBX to NaCl and CaCl2 was 20% and 15%, respectively. The half-life and foaming volume of SBX after thermal aging at 150 °C for 16 h were 2562 min and 430 mL, respectively. At the same time, the anti-oil pollution experiment indicated that SBX had good anti-pollution ability to crude oil when the crude oil concentration was less than 15%. The static suspended sand experiment showed that the settling time of carbonate sand particles with sizes of 2.1 cm and 1.7 cm in SBX foam was 550 times and 1160 times that in tap water, respectively. What’s more, the density and filtration loss of SBX at 150 °C were 0.64 g/cm3 and 9.6 mL, respectively. SBX was a non-Newtonian fluid at 150 °C, and the power-law model of the foam system was τ = 2.187ŕ0.419. SBX is of great significance to the workover operation of deep and ultra-deep wells with low-pressure coefficient and high inorganic salt.

Research on Downhole Blocking and Acidizing Technology for Low Pressure Oil and Gas Wells in Old Oil and Gas Fields

Carboniferous reservoirs in old areas pose significant challenges due to their large depths, often exceeding 3000 m and sometimes reaching up to 5000 m. These wells frequently encountered pressure gradients below 0.5 and in some cases below 0.3. This difficulty in fluid flow makes it challenging to effectively control and stimulate gas production. To address these challenges, we conducted acid stimulation trials using a variety of techniques, including conventional acid, downwelling acid dissociation, and newly tested surfactant acids. Among these techniques, surfactant acids have demonstrated superior dissolution properties in downwelling acid stimulation experiments. Its distinctive properties, such as enhanced flow characteristics and improved performance in low-pressure environments, make surfactants a promising option for future stimulation operations in low-pressure gas wells. In conclusion, our experiments have shown that the use of surfactant acid for down-well acid stimulation in low-pressure gas wells can effectively address the challenges faced in the oil and gas wells in old oil and gas fields. These discoveries have led to the development of more efficient gas production techniques in similar geological formations. Further research and application of surfactant acid can lead to enhanced stimulation results and increased gas recovery in low-pressure gas wells.

K9 자주포 엔진용 오일펌프 조립체의 개선에 관한 연구*

This paper is on the improvement of the oil pump assembly for preventing low oil pressure symptoms of the K9 Self-Propelled howitzer engine. Although the TBO(Time Between Overhauls) of K9 self-propelled howitzer engine is 1,500 engine operating hours, 13.37 % of K9 Self-Propelled howitzer engines which were operated for only hundreds of hours suffered low oil pressure symptoms and failed to operate normally. Detailed investigation into the engine was conducted to establish the cause and generation mechanism of the symptoms and it was found that oil leakage due to abrasive wear of pressure relief valve piston housing occurred in the oil pump assembly. To prevent abrasive wear of piston housing, new design concept and design parameters of pressure relief valve have been proposed. Performance, durability and system installation test on the prototype based on the proposed design were followed and results validated the proposed design. Oil pump assembly based on this study is applied to mass production.

Design Consideration and Performance Evaluation of a Coconut Oil Extracting Machine

Abstract: Extraction of virgin coconut oil from coconut kernel is a major influential step for their commercialization. There are many extraction processes among which cold and hot extraction are conventional extraction processes. This paper focused on the design, construction and testing of a coconut extractor using fresh-dry process based on the low pressure oil extraction method production of virgin coconut oil to reduce the settling time of oil. Additionally, tests carried out on the machine were the oil quality test, yield comparison with conventional oil extractors and user experience. The drying motor of 1500hp was used for grinding and a 12V Dc motor converted to an AC drive was used for conveying to the extraction chamber. A heating element of 3KW was incorporated in the extraction chamber which was properly lagged to avoid heat losses. Results obtained showed that it takes 800 seconds of heating time at 70oC to actually extract oil from dried coconut under different parameter such as drying temperature, extraction time and moisture content. The production efficiency of machine was calculated to 69.5% and the machine performance was certified good. Oil quality was recorded at 0.46% free fatty acid. The designed extractor yielded approximately 20.7% of oil against 14.1% as recorded from traditional methods. User experience was rated an average of 8.47 on a maximum scale of 10 with ratings obtained from experts (7.5) experienced users (8.7) and non- experienced users (9.2). The production machine is novel for easier, safer and more economical extraction of virgin coconut oil over the traditional and conventional methods.

Optimization and Performance Evaluation of Foam Acid Systems for Plugging Removal in Low Pressure Oil and Gas Reservoirs

Foam acidization has unique advantages such as low damage, low filtration, low friction, high efficiency, excellent retardation, and fast liquid discharge rate, which is suitable for stimulation and reconstruction of low-pressure oil and gas reservoirs that have been developed over many years. It is obtained that the main chemical components of downhole plugging materials include vegetable oil, fatty acids and their esters, silicone oil, amide polymers, and additional organic components, as well as non-organic components, elemental sulfur, ferrous sulfide, iron disulfide, silicon dioxide, mineral salts, etc. The performance of foam acid was investigated by experiments, including the effective range of action of active acids, reducing filtration, increasing temperature resistance and high-temperature stability of foam acid deep wells. The new foam acid system is developed and optimized to suitable for low-pressure deep well acidification operations. Experimental evaluation optimized the acid foaming agent and foam stabilizer and developed a new foam acid formulation with foam stability, filter loss reduction, temperature resistance, and easy backflow performance. The experimental condition is that the temperature is 90 °C, the foam quality can reach more than 70% when mixed for more than 30 s, the average half-life is 38.75 min, and the liquid separation rate is 19.90 s/mL. Its suspension is better than that of conventional hydrochloric acid, its corrosion rate is 1.872 g/m2·h, and the flowback rate of foam acid residue reaches 97%. Experimental evaluation has shown that the developed foam acid features high surface activity, stable foam, strong temperature resistance, significant speed and corrosion suppression, and excellent drainage assist performance. Dynamical simulation evaluation of reservoir core foam acidification demonstrated that the foam features long-life, strong suspension capacity, excellent rheology, low filtration, and significant acidization and plug removal effects, and can be used in stimulating the medium-deep, high-temperature, and low-pressure oil and gas reservoirs.

Structure Size Optimization and Internal Flow Field Analysis of a New Jet Pump Based on the Taguchi Method and Numerical Simulation

Interlayer contradiction (high-pressure oil that prevents low-pressure oil from being extracted) has always been the main factor affecting the oil-recovery efficiency of the many oil-bearing series in shale oil wells in Eastern Shandong, China. If steps to deal with interlayer contradiction are not taken, Shengli Oilfield’s oil-recovery efficiency will be significantly reduced after a certain period of exploitation. Furthermore, as the drilling depth increases, the formation-fluid supply capacity of Shengli Oilfield becomes worse and further increases the difficulty of oil recovery as well as production costs. In order to improve the oil-recovery efficiency of shale oil wells in Eastern Shandong and realize cost reductions and efficiency increases, we designed a new jet pump in this study. The pump can be used for oil recovery according to the principle of Venturi jet propulsion, as the required power fluid is not a high-pressure fluid injected from the ground, but rather high-pressure oil that is present in the formation. Through the analysis of the overall structure of the new jet pump, it was found that the pump could not only transform the existing interlayer contradiction (co-mining of high and low oil layers by utilizing interlayer contradiction), but also had the characteristics of a simple structure and low production costs. Since the structural dimensions of the jet pump and the physical characteristic parameters of the fluid have significant impacts on pump efficiency, we first analyzed the internal flow field of the jet pump by using numerical simulations and found that the throat–nozzle distance, area ratio, throat length–diameter ratio, diffuser angle, and flow ratio had the most significant impacts on pump efficiency. After obtaining the specific numerical range of the abovementioned structural parameters when the pump efficiency was as its maximum, an orthogonal array designed according to the Taguchi method was used to conduct experiments. According to a range analysis and an analysis of variance, at an unchanged flow ratio (0.3156), the new jet pump achieved the highest efficiency (31.26%) when the throat–nozzle distance was 2.62 mm, the throat length was 46 mm, the throat diameter was 6.8 mm, and the diffuser angle was 7.5°. In comparing its efficiency with that before optimization, we noticed that the efficiency was significantly improved by about 10%. These research results not only offer a new idea for the existing oil-recovery mode, but also introduce a new method for optimizing the structure of jet pumps.

Process Design of an Integrated Virgin Coconut Oil (VCO) Processing Technology

Virgin Coconut Oil (VCO) is a product obtained from fresh coconut that has been very famous in the market due to its several uses. The research aims to: design a process for the production VCO that utilizes both fresh-dry and fresh-wet methods; determine the weights of recovered coconut waste materials, VCO recovery of the three production lines, and investigate the possible utilization of these wastes to produce value-added commodities; and develop a conceptual design of the production of VCO that applies to a small-medium scale coconut community or farm in the Philippines. Preparation of raw materials includes splitting and grating of coconut meat and milk extraction. A conceptual design for the integrated method applicable to a small-medium scale coconut community in the Philippines was developed employing three assembly lines: (1) the low-pressure oil extraction via centrifugation method; (2) the fresh-dry process through low-pressure oil extraction method; and (3) the fresh-wet process through modified kitchen method that produces the clearest oil with VCO recovery of 18.43%, 25% and 16.5% for VCO production lines 1, 2 and 3 respectively. The VCO produced is expected to qualify in the Asian and Pacific Coconut Community (APCC) VCO Standards. The weight of all recovered materials and wastes were accounted for.

Effect of oil pressure upon filament wound basalt/glass fibers hybrid polymer based composite pipes subjected to low velocity impact

In this study, low-velocity impact tests were applied to E-glass fiber (GFR) and basalt fiber reinforced (BFR) filament-wound hybrid composite pipes. The BFR/GFR hybrid pipes were subjected to low-velocity impact tests when they were oil-unfilled, oil-filled at 0 bar (unpressurized oil) and low oil pressure at 5 bar. Impact energies were applied as 15 J, 20 J and 25 J, respectively. After the experiments, the dynamic behaviors and damage formation within the samples were evaluated in terms of type and severity.

Extending Co2 Eor and Associated Storage to Low-Pressure Oil Reservoirs by Adding Rich Gas Components to the Injection Stream

Extending Co2 Eor and Associated Storage to Low-Pressure Oil Reservoirs by Adding Rich Gas Components to the Injection Stream

ANALYSİS OF THE İMPACT OF PHYSİCAL AND CHEMİCAL FEATURES OF THE NATURAL GAS TO THE PARAMETERS OF THE GAS TRANSPORT SYSTEM

Definition of the technological regimes of the natural gas transportation system is co-related with the physical and chemical features of the gas. The results of the chemical analyses of gas in the gas turbine compressor station are laid out in the article: various levels of changes of the composition of gas at various points are described. Technological losses of gas are determined, as the result of change in its specific weight in the process of compression, cooling down and separation at the compressor station. Gas losses in the sub water main gas pipelines are analyzed. Changes of the content of the gas carbonate in the composition of the gas are analyzed, its degradation alongside the pipeline and existence of the CO2 in the composition of the low-pressure oil associated gas is described in comparison with the high-pressure natural gas, which is 3,8 times more. The problems, caused by the presence of the gas carbonate in the composition of the natural gas, are highlighted. The physical properties of natural gas are characterized by its specific gravity, temperature, pressure, volume and other parameters, and chemical properties by its composition, stability of gas-forming components. It should be noted that the physical and chemical properties of gas vary within certain limits, depending on the time, both on the reservoir and on the same reservoir. Therefore, in order to regulate the parameters of the gas transportation system, it is necessary to periodically examine and take into account the physical and chemical properties of the gas. Keywords: Natural gas, carbon dioxide,compressor station, gas pipeline, gas well.

The Fractographic Investigation of an Aeroengine Accessory Gearbox Quill Shaft

Abstract This paper analyzes the fracture of the quill shaft. An investigation of a twin-engine trainer aircraft incident has been reported. The incident occurred due to the right electric generator out and low oil pressure. The main failure based on the warnings and the subsequent incident was identified. The failure involved the fatigue fracture of the quill shaft on the J85 turbojet engine's accessory drive gearbox (ADG) and Input Drive Assembly (IDA). It was determined that the fracture had been originated by the torsional loads impacting the quill shaft that connects the ADG and IDA. The quill shaft was broken as the loads excessed the limit values designed by the manufacturer as a system protection part. Although the main failure was successfully identified, further analysis regarding the reaching to the triggering cause of the fracture was performed. Through the detailed fractographic and metallographic studies, the root-cause of the fracture was determined as the misalignment of the quill shaft between ADG as the driving unit and IDA as the driver unit.

Preface

The 2020 International Conference on Energy Saving and Environmental Protection and Civil Engineering (ESEPCE2020) was held on August 7-9, 2020 in Shanghai, China. Although the impact of covid-19, most participants were still highly enthusiastic about participating in this conference. In order to comply with the control and prevention of the pandemic covid-19, ESEPCE2020 was adjusted to be held online conference to avoid crowd gathering and physical contact. ESEPCE2020 will focus on green architecture, intelligent architecture, design of practicality and artistic. The conference aims to provide opportunities for the delegates to exchange new ideas and application experiences face to face, to establish business or research relations and to find global partners for future collaboration.During the conference, the conference model was divided into three sessions, including keynote speeches, oral presentations and online Q&A discussion. In the keynote speeches session, keynote speakers were each allocated 30-40 minutes to hold their speeches. More than fifty scholars from different renowned universities attended this conference. We are honored to invite Prof. Nazri bin Ali from Faculty of Civil Engineering, Universiti Teknologi Malaysia to serve as our Conference Chair and made amazing keynote speeches on Hydrological Effect On Slope Stability Analysis. This keynote discusses some of the previous failures, the type of failures, the causes of failures, and summaries some suggestions to lessen future occurrence. And we are glad to invite Prof. Shijian Lu from Sinopec Petroleum Engineering Corporation and China University of Petroleum(East China) as keynote speakers to made amazing speeches about Key technology and application of low partial pressure CO2 capture, transportation and oil displacement storage surface engineering. His projects have implemented CO2 emission reduction effectively, promoted the development of national green economy and protected the environment. In the oral presentations session, some scholars were given about 5-10 minutes to perform their oral presentations one by one. In the Q&A session, all participants were invited to join in academic groups to discuss and explore the academic issues after the presentations. The discussion session will last 40 minutes.The proceedings collected the latest research and results in the field of Energy Saving, Environmental Protection and Civil Engineering. The topic of this collection is related to energy saving and environmental protection technology, Internet+Environmental protection, architecture and urban planning, civil and structural engineering and so on. All manuscripts published in the proceeding have been through rigorous review and process to meet the requirements of International publication standard.We would like to express our sincere gratitude to the Chairman, the distinguished keynote speakers, as well as all the participants. We also want to thank the publisher for publishing the proceedings. We are grateful to all those who have contributed to the success of ESEPCE2020. We hope that all participants and other interested readers benefit scientifically from the proceedings.Committee member, Conference Chair, Organizing Committees, Technical Committees are available in the pdf.

Structure optimization and flow field simulation of plate type high speed on-off valve

There is a relatively complex flow state inside the high speed on-off valve, which often produces low pressure area and oil reflux in the high-speed opening and closing process of the spool, causing cavitation and vortex and other phenomena. These phenomena will affect the stability of the internal flow field of the plate valve and the flow characteristics of the high speed on-off valve. Aiming at the problems of small flow rate and instability of internal flow field, a new spool structure was designed. The flow field models of two-hole and three-hole plate spools with different openings were established, and software Ansys Workbench was chosen to mesh the model. The standard k-e turbulence model was selected for numerical simulation using Fluent software. The pressure distribution and velocity distribution under the same pressure and different opening degree were obtained. The structure and parameters of the optimization model were also obtained. The stability analysis of flow field under different pressure was carried out. The results demonstrate that the three-hole spool has a similar flow field change with the two-hole spool, but it does not create a low pressure zone, and the three-hole spool can work stably at 2 MPa or less. This method improves the appearance of low pressure area and oil backflow in the process of high speed opening and closing of spool. The stability of flow field and the flow rate of high speed switch valve are improved. Finally, the products designed in this paper are compared with existing hydraulic valve products. The results show that the three-hole plate type high speed on-off valve designed in this paper maintains the stability of the internal flow field under the condition of 200 Hz and large opening degree, and realizes the increase of flow rate.

Ultrathin microporous membrane with high oil intrusion pressure for effective oil/water separation

Hydrophilically-modified mesh filter membranes have been widely researched for oil/water separation due to their high permeating flux and excellent separation efficiency. However, the low oil pressure resistance of mesh membrane is a major drawback limiting its practical oil/water separation applications. In this work, we report an ultrathin microporous membrane developed via the decoration of a stainless steel mesh filter with electrospun poly(acrylic acid) grafted poly(vinylidene fluoride) (PAA-g-PVDF) nanofibers. The network structure of the nanofiber layer reduces the pore size of the stainless steel mesh to improve its oil pressure resistance, and simultaneously maintains a high active separation area to preserve the highly permeable feature of the mesh filter membrane. Therefore, this composite membrane exhibits high permeating flux (up to 53574 L m−2 h−1 under gravity) and high oil intrusion pressure (>6000 Pa) at the same time. Satisfactory permeating flux and separation efficiency are achieved in various oil/water separation experiments and multiple operating cycles, which demonstrate the great potential of the membrane for practical oily wastewater treatment applications.

Identifikasi Kerusakan Shaft Roda Gigi Pompa Oli Diesel Engine Dengan Menggunakan Metode Fault Tree Analysis

A damage to the oil pump drive shaft on one of the generator sets PT.X. Failure begins with an indication of a decrease in oil pressure where the oil pressure indicator points to the number 0 (zero). Based on the electronic control module (ECM) download data, it was noted that the unit had experienced 4 times low oil pressure warning and 4 times low oil pressure shutdown. During visual checking, the crankshaft suddenly stops spinning (jammed). To identify the initial damage associated with low oil pressure and the crankshaft stops rotating (crankshaft jammed), an oil pump component is dismantled. In a visual inspection found broken oil pump drive gear. In identifying oil pump failure and analysis using the Fault Tree Analysis method. Based on the FTA the oil pump failure is caused by 4 (four) factors including, 1. Oil quality, 2. Contamination control, 3, Material quality, and 4. Maintenance, from the four causes which are the main causes of control contamination, due to the presence of material metal above the axle goes to the oil pump. Based on the initial material test the broken gear begins with the outer circle and the final fracture in the center of the gear shaft, from the microstructure testing of the fracture shape there is no beachmark on the broken surface and the final shape of the rough fracture, that the gear shaft is broken in a short time.