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2024 SPE Asia Pacific Oil and Gas Conference and Exhibition, APOGCE 2024

作者： Zhang, Jiawei Wang, Qing Du, Shiliang Zhuo, Lubin Liu, Wei Ling, Bo CNPC Engineering Technology R&D Company Limited Beijing China China National Oil and Gas Exploration and Development Company Limited Beijing China Drilling and Production Technology Research Institute PetroChina Qinghai Oilfield Company Gansu Dunhuang China

ISBN: (纸本)9781959025269

Downhole vibration, such as backward or chaotic whirling, is one of the primary causes for drill string failure during drilling operation. Understanding drilling dynamics is crucial for determining the mechanism of vibration and fatigue accumulation so as to mitigate risk of drill string failure. Drilling dynamics or vibration data can either be obtained from real-time measurement or simulation based on dynamics model, which plays a crucial role for drilling optimization in pre-drill planning phase. An advanced 4D drilling dynamics model, which considers the interaction between drill bit and formation, impact and friction between drill string and wellbore, constraints exerted on drill string and drill bit, is proposed to simulate the distribution and variation of 3D displacement, velocity, acceleration as well as the stress state of entire drill string within specified time period. This time domain model allows exploration of the full range of dynamics response under different drilling scenarios, which helps to optimize the performance and reliability of BHA as well as WOB/RPM selection. Moreover, drill string fatigue life prediction can also be achieved by combing simulated stress state and fatigue accumulation theory. Simulation shows that BHA with smaller- sized drill collar or fewer stabilizers are more susceptible to backward and even chaotic whirling while drilling. Also, inappropriate WOB/RPM combinations such as low WOB with high RPM could also cause the onset of severe lateral vibration. High frequency bending stress, mainly concentrated on BHA and caused by lateral vibration, is the main reason for rapid fatigue accumulation and continuous severe vibration could even result in drill string fatigue failure within hours. These findings helped to justify the 5 consecutive BHA failure and 1 washout while drilling the 171/2" wellbore with 7621 ft length of an ultra-deep well. Simulation also showed that downhole lateral vibration severity was significantly redu

关键词： Drill collars

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research Progress of Micro-CT in the Field of Petroleum engineering 13th

Research Progress of Micro-CT in the Field of Petroleum Engi...

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13th International Field Exploration and development Conference, IFEDC 2023

作者： Ye, Zhi-Lin Lu, Hai-Wei Gao, Xiang Liu, Jian-Quan Jin, Yi CNPC Engineering Technology R&D Company Limited Beijing China Research Institute of Petroleum Exploration and Development Beijing China Drilling and Production Technology Research Institute PetroChina Jidong Oilfield Company Hebei China

ISBN: (纸本)9789819704675

Computerized Tomography (CT) technology has gained wide development in the field of petroleum geology due to its unique advantages in rapid, high-precision, non-destructive analysis, and three-dimensional imaging for microstructure analysis. This article reviews the research progress of CT scanning technology in the field of petroleum engineering in recent years and summarizes its applications in reservoir microstructure, rock and mineral properties, digital core simulation, and non-destructive analysis of rubber materials. Quantitative characterization information such as reservoir pore structure, mineral composition, particle size distribution, and fracture identification can be obtained through three-dimensional image analysis. By constructing digital cores, rock physical properties such as elasticity, permeability, electrical properties, and oil-water distribution can be further studied. In addition, CT scanning and imaging technology have also been gradually applied to defect analysis in rubber materials, providing new technical means for predicting their failure behavior. The construction of digital cores based on CT scanning technology has become a research hotspot in the petroleum field, providing technical support for the three-dimensional visualization and fine quantitative characterization of rock structures. In the future, achieving the integration of digital core data and constructing an application platform from core to reservoir, from micro to macro scales, is the development trend of high-precision CT scanning combined with computer technology. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Computerized tomography

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Revealing and Solving the Hidden Hinders for Efficient Shale Gas Drilling Based on Data Analytics and Machine Learning

Revealing and Solving the Hidden Hinders for Efficient Shale...

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2024 SPE Asia Pacific Oil and Gas Conference and Exhibition, APOGCE 2024

作者： Zhang, Jiawei Zhuang, Tao Ji, Guodong Huang, Hongchun Ding, Zhen Yang, Zhaoliang CNPC Engineering Technology R&D Company Limited Beijing China China Petroleum Technical Service Corporation Limited Beijing China CNPC ChuanQing Drilling Engineering Company Limited Sichuan Chengdu China Engineering Technology Research Institute PetroChina Southwest Oil & Gas Field Company Sichuan Chengdu China

ISBN: (纸本)9781959025269

Despite annual production of shale gas exceeding 20 billion cubic meters from Sichuan basin in China, its cost-effective development has been constrained by lengthy drilling cycle of horizontal sections caused by downhole complex such as leakage, stuck pipe, multiple drilling trips due to frequent downhole tool failure, low ROP, bit wear and other related challenges. Progress has been realized in reducing NPT and increasing ROP due to extensive effort in complex prevention and drilling optimization in the last few years. However, little attention has been paid to the influence of downhole vibration and bit wear misjudgment on efficient shale gas drilling. This paper presents the revealing and solving of these two hidden hinders based on data analytics and machine learning. Various sources of data, including over 300 cases of bit records, lithology, elemental logging and downhole vibration measurements from drilled formation for selected representative drill bits, as well as the data from full-scale indoor experiments, were collected for analysis and comparison. The characteristic of bit vibration and rock-breaking efficiency, obtained from five specifically designed 8-1/2″ PDC bits with different levels of worn cutting teeth which were used to drill artificial cores with varying degrees of heterogeneity, were evaluated with data from bit records and downhole measurements. Furthermore, identification of bit wear states was realized to reduce unnecessary POOH by combing RFA and data from bit records. It's revealed that severe downhole vibration, caused by formation heterogeneity and reflected in mineral composition when crossing different layers, is one of previously overlooked causes for downhole tool failure and premature bit wear. Consequently, trajectory optimization was proposed to reduce downhole vibration. Experimental results suggested the wear value of 2-2 should be defined as "critical wear value" for PDC bit as significant difference in rock-breaking perfor

关键词： Drills

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Equivalent circulating density calculation after gas kick considering temperature and pressure 58

Equivalent circulating density calculation after gas kick co...

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58th US Rock Mechanics / Geomechanics Symposium 2024, ARMA 2024

作者： Jiang, Zhenxin Tao, Zhenyu Wang, Zheng Zhang, Wenbo Liu, Yuhan Liu, Jitong Fu, Jing Fan, Honghai Sun, Lewang Engineer Technology Research Institute Xinjiang Oilfield Company Xinjiang China China University of Petroleum Beijing China CNPC Engineering Technology Research and Development Company Limited Beijing China Colorado School of mines United States

ISBN: (纸本)9798331305086

Deep water is rich in oil and gas resources, which is of great significance to world energy. However, its reservoir geological conditions are complex, the drilling safety density window is narrow, the wellbore pressure is difficult to control, overflow, kick and other accidents are prone to occur, and there are high temperature and high pressure phenomena. In order to deal with a gas kick through managed pressure drilling in time after the gas kick, it is necessary to comprehensively consider the effects of temperature and pressure on the density and rheology of drilling fluid, and accurately calculate the bottom hole ECD after gas kick. Based on the wellbore multiphase flow model and considering the influence of temperature and pressure on the density and rheology of drilling fluid, combined with the special process flow of deep water managed pressure drilling, a more accurate ECD calculation method for deep water managed pressure drilling after gas kick is established in this paper. Verified by the data of well M in a sea area of China, the error of this method is 2% with high accuracy, which provides the basis for field managed pressure drilling. Copyright 2024 ARMA, American Rock Mechanics Association.

关键词： Drilling fluids

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research on Welding Process of Duplex Stainless Steel S31803 2

Research on Welding Process of Duplex Stainless Steel S31803

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2022 2nd International Conference on Advanced Manufacturing technology and Electronic Information, AMTEI 2022

作者： Liu, Jian Niu, Huli He, Yazhang Zhang, Yinuo Sun, Xinyan CNPC Engineering Technology Research Company Limited Tianjin300451 China CNPC Key Laboratory of Offshore Engineering Tianjin300451 China

The welding test of duplex stainless steel S31803 pipe was carried out by means of argon tungsten arc welding as backing, hot welding, and manual arc welding as filling and covering. The mechanical properties, microstructure, phase ratio, and corrosion resistance of the welded joint were studied and analyzed through the test method. The results show that the appropriate welding parameters can control the proportion of ferrite and austenite, the mechanical properties, ferrite content, and pitting resistance of welded joints to meet the relevant requirements of the standard, and the established welding process has a good guiding role for the welding of duplex stainless steel in gathering and transmission pipelines. © Published under licence by IOP Publishing Ltd.

关键词： Ferrite

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research and Application of Flexible Fracturing Manifold in Volumetric fracturing

Research and Application of Flexible Fracturing Manifold in ...

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International Petroleum and Petrochemical technology Conference 2024, IPPTC 2024

作者： Chai, Long Bai, Mingwei Ye, Sai Che, Haoyang Yang, Min Changqing Downhole Technology Company CNPC Chuanqing Drilling Engineering Company Limited China National Engineering Laboratory for Exploration and Development of Low-permeability Oil and Gas Fields China

In order to solve the problems of high pressure pipe valves in Volumetrictric fracturing, such as large demand of high pressure pipe and valve parts, high pressure manifold for fracturing complex connection, fracturing pipeline connections are complex, long fracturing construction preparation period. The economy and timeliness of pipeline connection seriously affect the speed and efficiency of Volumetrictric fracturing operations. This paper designed and developed the high pressure flexible composite pipe and carried out its performance evaluation test. Combined with Volumetrictric fracturing operation conditions, supporting functional modular manifold system, overcome flexible pipeline and rigid pipeline fast connection technology, flexible fracturing manifold system was formed. Through the large-scale field application in the unconventional reservoir Volumetric fracturing field, The flexible fracturing manifold is compared with the conventional high-pressure pipe valve connection and the single pipe universal connection, the flexible fracturing manifold can reduce the use of high-pressure pipe valves by 1/3, increase the efficiency of fracturing manifold connection by 50%, and reduce the labor intensity by 50%, enables efficient, reduce high pressure manifold connection points by 70%. The timeliness and safety of fracturing manifold connections have been greatly improved. Flexible fracturing manifold fundamentally change the connection mode of Volumetrictric fracturing high-pressure manifold, and realizes the speed and efficiency of reservoir transformation. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： High pressure pipelines

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Implications for fault reactivation and seismicity induced by hydraulic fracturing

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Petroleum Science 2024年第2期21卷 1081-1098页

作者： Zi-Han Sun Ming-Guang Che Li-Hong Zhu Shu-Juan Zhang Ji-Yuan Lu Chang-Yu Jin Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines School of Resources and Civil Engineering and Key Laboratory of Liaoning Province on Deep Engineering and Intelligent TechnologyNortheastern UniversityShenyang110819LiaoningChina Research Institute of Petroleum Exploration&Development PetroChina Company LimitedBeijing100084China The Exploration and Development Research Institute of Daqing Oilfield Limited Company Daqing163458HeilongjiangChina

Evaluating the physical mechanisms that link hydraulic fracturing(HF) operations to induced earthquakes and the anticipated form of the resulting events is significant in informing subsurface fluid injection operations. Current understanding supports the overriding role of the effective stress magnitude in triggering earthquakes, while the impact of change rate of effective stress has not been systematically addressed. In this work, a modified critical stiffness was brought up to investigate the likelihood, impact,and mitigation of induced seismicity during and after hydraulic fracturing by developing a poroelastic model based on rate-and-state fraction law and linear stability analysis. In the new criterion, the change rate of effective stress was considered a key variable to explore the evolution of this criterion and hence the likelihood of instability slip of fault. A coupled fluid flow-deformation model was used to represent the entire hydraulic fracturing process in COMSOL Multiphysics. The possibility of triggering an earthquake throughout the entire hydraulic fracturing process, from fracturing to cessation, was investigated considering different fault locations, orientations, and positions along the fault. The competition between the effects of the magnitude and change rate of effective stress was notable at each fracturing stage. The effective stress magnitude is a significant controlling factor during fracturing events, with the change rate dominating when fracturing is suddenly started or stopped. Instability dominates when the magnitude of the effective stress increases(constant injection at each fracturing stage) and the change rate of effective stress decreases(the injection process is suddenly stopped). Fracturing with a high injection rate, a fault adjacent to the hydraulic fracturing location and the position of the junction between the reservoir and fault are important to reduce the Coulomb failure stress(CFS) and enhance the critical stiffness as

关键词： Hydraulic fracturing Coulomb failure stress Rate-and-state fraction model Linear stability analysis Critical stiffness Seismically induced fault

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What is Learned from Polymer Flooding Practices in Offshore Reservoirs?

What is Learned from Polymer Flooding Practices in Offshore ...

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2023 Offshore technology Conference, OTC 2023

作者： Guo, Hu Wang, Zhengbo Dang, Sisi Wen, Rui Lyu, Xiuqin Liu, Huifeng Yang, Meng China University of Petroleum-Beijing CNPC Research Institue of Petroleum Exploration Development PetroChina Xinjiang Oilfield Company Sinopec Northwest Oilfield Company CNPC Engineering Technology R&D Company Limited

ISBN: (纸本)9781613999745

Polymer flooding is very promising chemical enhanced oil recovery technique because it has been widely field tested in many oil fields and commercially applied in several countries in onshore reservoirs. The understanding of polymer flooding mechanisms is still developing, even though the principal mechanism was sweep efficiency increase due to reduced mobility ratio of water and oil due to reduced mobility of water. The incorporation of polymer flooding mechanisms and practical challenges make some projects fail to attain economical or technical goal. For offshore reservoirs, the polymer flooding becomes more difficult because of limited space and harsh reservoirs. Although there were hundreds of polymer flooding field tests in onshore reservoirs, polymer flooding in offshore reservoirs remains limited. In this paper, the previous onshore polymer flooding lessons and findings were briefly reviewed to look into the mechanisms which can guide the design of polymer flooding in offshore reservoirs. Then, the lessons learned from previous offshore reservoirs were reviewed. Advices were given to improve the field test performance. it is conclude that low concentration polymer solution with moderately-low viscosity should be injected into offshore reservoirs to keep displacing pressure between injectors and producers. The injected polymers should have good transportation ability which avoids the formation blockage. The optimum injection timing remains to be further investigated because the evidences. The injection rate should be controlled to avoid well casing damage which has been observed in onshore reservoirs. Except for Bohai oilfield, the formation blockage was not reported in offshore reservoirs. However, the microfracture can form in injectors which improved the injectivity of polymers as long as the injected polymers have good transportation capacity. © 2023, Offshore technology Conference.

关键词： Reservoirs (water)

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Optimized Drilling Status Recognition for Oil Drilling Using Artificial Intelligence: Empirical research and Methodology 13th

Optimized Drilling Status Recognition for Oil Drilling Using...

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13th International Field Exploration and development Conference, IFEDC 2023

作者： Yang, Xin-Yi Cui, Meng Zhang, Yan-Long Jing, Ling-Zhi Ji, Yong Shi, Xiao-Yan CNPC Engineering Technology Research&D Company Limited Beijing China National Engineering Research Center of Oil & Gas Drilling and Completion Technology Beijing China

ISBN: (纸本)9789819702718

This study focuses on the application of modern artificial intelligence (AI) techniques to improve the accuracy of drilling status recognition in the oil drilling industry, with the aim of enhancing safety and efficiency. To address the limitations of existing research in evaluation methods and practical applications, we constructed a unified drilling status dataset, introduced a more scientific evaluation criterion, the F1 score, and conducted a comprehensive evaluation and improvement of existing oil drilling status recognition methods. This paper provides an in-depth analysis of various drilling status characteristics and explores the applicability and limitations of different AI algorithms in drilling status recognition. Based on these findings, we propose optimized general drilling status recognition algorithms and validate the performances in real drilling status. Our research offers valuable insights and guidance for future oil drilling status recognition studies and is expected to promote safer and more efficient development in the oil drilling industry. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Deep learning

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development of an Oil-Well Downhole Behavior Classification Method Based on Pressure Parameters 1

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13th International Field Exploration and development Conference, IFEDC 2023

作者： Feng, Xin Jia, Heng-Tian National Engineering Research Center of Oil and Gas Drilling and Completion Technology CNPC Engineering Technology R&D Company Limited Beijing China

ISBN: (数字)9789819704798

ISBN: (纸本)9789819704781

Automated processing of downhole engineering parameters and intelligent classification of working conditions play an important role in improving production efficiency and promoting the production process of oil fields. However, in the offline interpretation process of long-term downhole pressure parameters, the huge amount of data storage and uncertain downhole noise and interference can seriously affect and delay the interpretation of engineering parameters. At the same time, inaccurate and incomplete collection of downhole parameter feature extraction methods, improper selection, and optimization of downhole behavior classification mechanisms, etc., can seriously restrict the rapid and accurate extraction of pressure features, making the correct classification of downhole working conditions face greater challenges. In this paper, wavelet, time-domain, and gradient features of the downhole pressure parameters were extracted, and three methods including, neural network, support vector machine and K-nearest neighbor method, were used to classify the working conditions. By comparing the processing results under the interaction of different types of features and different behavior classification mechanisms, a classification method for downhole working conditions based on pressure parameters was optimized. The results show that the application of the optimal behavior classification method based on the optimal multi-feature has both small deviation in pressure parameters and high accuracy in working condition classification. This method provides a feasible data analysis method for downhole parameters. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Classification (of information)

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