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12th International Field Exploration and development Conference, IFEdC 2022

作者： Tian, Yu-Meng Zhao, Yi-Peng Li, Jin Cui, Meng CNPC Engineering Technology R&D Co. Ltd. Beijing China

ISBN: (纸本)9789819919635

The determination of drilling fluid rheological parameters plays an important role in the calculation of drilling circulation friction. The traditional method uses the least squaresmethod to solve the problem. For the Power Lawand Herschel-Bulkley models, by taking the logarithm to linearize of the equation, and then solved by linear regression. This method is not solved in the nonlinear space, it is not the optimal solution to the equation, is only the optimal solution in the linear space. In this paper, according to the characteristics of Power Law and Herschel- Bulkley rheological equations, the gradient descentmethod is used to calculate the local optimal solution of the rheological model. By selecting an appropriate initial value, the iterative algorithm can quickly and stably converge to the target solution range, and obtain accurate rheological parameters. This algorithm directly solves in nonlinear space, so the result is the optimal solution, and has higher precision than traditionalmethods. It is also proved by practical examples, the parameters of the Power Law and Herschel-Bulkley rheological models obtained by this method have higher precision. This method can be applied to the optimization selection of drilling fluid rheological models, and evaluation of drilling fluid property. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2023.

关键词： drilling fluids

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CGdS near-bit geosteering drilling system and its first application in Niger 7

CGDS near-bit geosteering drilling system and its first appl...

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7th International Conference on downhole Measurement and Control, ICdMC 2024

作者： Pan, Xingming Li, Jiran Sui, Yuan Tang, Yuzhe Zhang, Haibo Shi, Qian 1Beijing Petroleum Machinery Co. Ltd Beijing 102206 China 2CNPC Engineering Technology R&D Company Limited Beijing 102206 China

The Niger project is one of the important exploration and development cooperation projects of China National Petroleum Corporation in West Africa. The dibeilla N-1 block of Agadem oilfield in Niger faces challenges such as frequent interlayers and susceptibility to encountering faults during drilling. According to the deployment requirements of the plan, the block will be developed using a mixed well network of horizontal and vertical wells, and the upper sand body will need to be developed using horizontal wells. The dogleg angle of the inclined wellbore should be controlled within 2~4.5 (°)/30m, and the target thickness should be only 3m. Conventional guiding tools represented by MWd(Measurement While drilling) cannot achieve effective and efficient reservoir identification and trajectory adjustment in thin oil layers due to their zero length of around 10 meters. Therefore, a geological guiding tool that can achieve near drill bit measurement is needed. Therefore, in order to successfully complete the horizontal section drilling and guidance engineering, maximize the drilling encounter rate of high-quality reservoirs, communicate favorable layers to achieve oil reservoir benefit development, it is decided to use CGdS(cnpc Geological drilling System) near bit geological guidance tool to implement horizontal section drilling. The system is equipped with gamma, resistivity, and engineering parameter measurements at a distance of 3 meters from the drill bit, providing multiple basis for precise directional guidance of the formation. In the dibeilla N-1 block of Niger, a total of 6 wells were applied, with an average reservoir drilling encounter rate of 85.38% and a mechanical drilling speed of 12.31 m/h. The first application of this system overseas has provided valuable experience for similar domestic work. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Horizontal wells

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New design method of unequal taper thread(UTT)pairs and its application in API NC38 thread improvement

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Petroleum 2023年第3期9卷 439-453页

作者： Hangming Liu Yangye He Jifang Wan Lin Chen Xianzhong Yi Song Hou Yanbin Wang dongxu He Gang Li Cooperative Innovation Center of Unconventional Oil and Gas Yangtze University(Ministry of Education&Hubei Province)Wuhan430100China School of Mechanical Engineering Yangtze UniversityJingzhou434023China College of Safety and Ocean Engineering China University of Petroleum-BeijingBeijing102249China CNPC Engineering Technology R&D Company Limited Beijing102206China Changqing Drilling Company of CNPC Chuanqing Drilling Engineering Company Limited Xi'an710018China MOE Key Laboratory of Petroleum Engineering China University of Petroleum-BeijingBeijing102249China Shengli Oilfield Company SINOPECDongying257051China

API standard threads are the most commonly used thread configurations for drill pipe joints in the petroleum *** with the increasing application of horizontal wells and extended-reach wells in drilling engineering,drill pipe joint threads are subjected to complex loads,and drill pipe joint thread breakage accidents occur *** API NC38 threaded pair used in the SU36-8-4H2 well suffered a fracture *** analysis found that the fracture sites were located near the root of the first engagement pin-thread where the stress was ***,it is necessary to find an alternative method to reduce the largest stress of NC38 ***,a new design method of unequal taper thread(UTT)pairs is proposed that the taper of pin thread,slightly smaller than the taper of matched-box thread,is not equal to one of *** the UTT pairs of API NC38 thread,the taper of box thread is kept as the standard taper of 1:6,but the taper of pin thread is,respectively,1:6.1(UTT-I),1:6.2(UTT-Ⅱ),1:6.3(UTT-Ⅲ)and 1:6.4(UTT-IV).The 3d finite element models of four UTT pairs and one standard pair based on NC38 thread were developed,and the mechanical properties of five thread pairs bearing such typical working loads as torque,axial compression,axial tension,bending moment,internal and external pressure,were *** results show that four UTT pairs are superior to the standard pair of API NC38,and UTT-Ⅲ has the most performance in all of four UTT *** with the standard pair of API NC38,UTT-Ⅲ pair can improve the bearing capacity such as torsion strength,compression strength,tensile strength,bending strength,strength against internal and external pressure,by 24.8%,13.2%,22%,9.99%and 14.2%,*** new design method of UTT pair enhances the bearing capacity of API NC38 thread,and has been applied in Changqing drilling company of cnpc Chuanqing drilling engineering company *** UTT-thread pair method is not only applicable f

关键词： Unequal taper thread pairs NC38 thread improvement rotary shouldered connection thread Failure analysis drill pipe joint

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Bottom hole pressure prediction based on hybrid neural networks and Bayesian optimization

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Petroleum Science 2023年第6期20卷 3712-3722页

作者： Chengkai Zhang rui Zhang Zhaopeng Zhu Xianzhi Song Yinao Su Gensheng Li Liang Han College of Petroleum Engineering China University of Petroleum(Beijing)Beijing102249China College of Artificial Intelligence China University of Petroleum(Beijing)Beijing102249China National Key Laboratory of Petroleum Resources and Engineering China University of Petroleum(Beijing)Beijing102249China CNPC Engineering Technology R&D Company Limited Beijing102206China

Many scholars have focused on applying machine learning models in bottom hole pressure (BHP) prediction. However, the complex and uncertain conditions in deep wells make it difficult to capture spatial and temporal correlations of measurement while drilling (MWd) data with traditional intelligent models. In this work, we develop a novel hybrid neural network, which integrates the Convolution Neural Network (CNN) and the Gate recurrent Unit (GrU) for predicting BHP fluctuations more accurately. The CNN structure is used to analyze spatial local dependency patterns and the GrU structure is used to discover depth variation trends of MWd data. To further improve the prediction accuracy, we explore two types of GrU-based structure: skip-GrU and attention-GrU, which can capture more long-term potential periodic correlation in drilling data. Then, the different model structures tuned by the Bayesian optimization (BO) algorithm are compared and analyzed. results indicate that the hybrid models can extract spatial-temporal information of data effectively and predict more accurately than random forests, extreme gradient boosting, back propagation neural network, CNN and GrU. The CNN-attention-GrU model with BO algorithm shows great superiority in prediction accuracy and robustness due to the hybrid network structure and attention mechanism, having the lowest mean absolute percentage error of 0.025%. This study provides a reference for solving the problem of extracting spatial and temporal characteristics and guidance for managed pressure drilling in complex formations.

关键词： Bottom hole pressure Spatial-temporal information Improved GrU Hybrid neural networks Bayesian optimization

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Plugging performance and mechanism of an oil-absorbing gel for lost circulation control while drilling in fractured formations

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Petroleum Science 2022年第6期19卷 2941-2958页

作者： Ying-rui Bai Li-Yao dai Jin-Sheng Sun Guan-Cheng Jiang Kai-He Lv rong-Chao Cheng Xiao-Sen Shang School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580ShandongChina CNPC Engineering Technology R&D Company Limited Beijing102206China College of Petroleum Engineering China University of Petroleum(Beijing)Beijing102249China

Lost circulation of drilling fluid is one of the most common engineering problems in the drilling process of fractured *** this study,an oil-absorbing polymer gel synthesized using compound monomers with rigid and flexible chains was applied to control the oil-based drilling fluid loss while *** microstructure,oil-absorbing performance,and plugging performance the gel was investigated.A large number of dense pores on the surface of the gel were observed,which allowed the oil molecules to enter the internal space of the *** initial oil absorption capacity of the gel was fast,and it increased with the increase in the temperature and decrease in the particle size,reaching 20.93 g/g at140℃.At a high temperature of 140℃,the bearing pressure capacity of the gel formula containing particles of different particle sizes reached 7.6 MPa for a fracture of a width of 3 mm,showing that the oil-absorbing gel have excellent plugging performance at high *** mechanism of the gel was investigated through visualized fracture plugging *** show that the dynamic migratio n,particle-swelling,particle-bridging,particle-aggregation,deformation-filling,and compaction-plugging contribute to the whole lost circulation control process,reflecting that the plugging performance can be effectively enhanced by improving the aggregation and filling degrees of the gel with different particle sizes.

关键词： Lost circulation Oil-absorbing gel Oil absorption capacity Plugging mechanism Fractured formation

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research Status and Progress of Foam drainage-Gas recovery technology in Shale Gas Wells 13th

Research Status and Progress of Foam Drainage-Gas Recovery T...

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13th International Field Exploration and development Conference, IFEdC 2023

作者： Jin, Yi Xie, Jia-Jun Gao, Xiang Liu, Jian-Quan Ye, Zhi-Lin Sun, Xun Chang, Qi-Fan CNPC Engineering Technology R&D Company Limited Beijing China Changning Branch of Petro China Southwest Oil and Gas Field Company PetroChina Southwest Oil and Gas Field Company Beijing China China University of Petroleum Beijing China

ISBN: (纸本)9789819702596

Shale gas is an important unconventional energy. Because of its special geological structure and complex well depth structure, it is difficult to exploit and will produce wellbore fluid accumulation in the production process. These problems can be effectively solved through drainage and gas production technology. Foam drainage-gas recovery technology is a relatively mature technology, which is widely used in major shale gas fields in China and abroad. The critical part of the technology is the selection and filling of foaming agent. For the foam drainage gas production technology for shale gas wells, investigated the technical status, studied the process optimization method and foam drainage agent injection method, and introduced the latest intelligent foam drainage and composite drainage and production technologies which are based on the characteristics of shale gas. Besides that, the article described the characteristics of foam drainage agent are summarized, and the preparation and application of high-performance composite foam drainage agent with temperature resistance, salt resistance, acid resistance, good stability and strong liquid carrying capacity and proposed the development direction of intelligent foam drainage, combined drainage technology and composite foam drainage agent. This research provides references for the foam drainage-gas recovery technology in shale gas wells in China. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Gases

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AdLM-LWd: Adaptive deep Learning Model for Lithology Identification from Logging- While-drilling data with Online Learning Mechanism

ADLM-LWD: Adaptive Deep Learning Model for Lithology Identif...

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New Trends in Computational Intelligence (NTCI), International Conference on

作者： Ziyun Zhao Wang Lin Lingzhi Jing Yumeng Tian Weihong Guo CNPC Engineering and Technology R&D Company Limited Beijing China

ISBN: (数字)9798331517021

ISBN: (纸本)9798331517038

Accurate lithology identification from Logging-While-drilling (LWd) data is crucial for optimizing drilling operations and enhancing reservoir characterization in the oil and gas industry. However, the lack of standardized datasets and the need for real-time adaptability in varying geological environments pose significant challenges. This study addresses these issues through three key contributions. First, a comprehensive dataset for lithology identification is constructed, combining LWd features with corresponding lithology labels, providing a valuable resource for deep learning applications in this field. Second, a novel deep learning model is proposed, integrating 2d convolution and bidirectional LSTM to effectively capture both spatial and temporal features of LWd data. The model demonstrates high stability and performance across various metrics in extensive cross-validation tests. Lastly, an Adaptive Incremental Learning Algorithm (AILA) is introduced, incorporating online learning mechanisms and dynamic adaptation strategies to enhance the model's real-time adaptability. These advancements contribute to more accurate and adaptive lithology identification systems, which potentially improve real-time decision-making in drilling operations and lead to more efficient and cost-effective exploration and production processes.

关键词： deep learning Learning systems drilling Adaptation models Accuracy Incremental learning Heuristic algorithms Geology real-time systems data models

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Experimental Investigation of Fracture Initiation Pressure reduction Mechanism through A New Hydraulic Pre-Pressurized Approach 10

Experimental Investigation of Fracture Initiation Pressure R...

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10th Academic Conference of Geology resource Management and Sustainable development 2022

作者： Zhang, Yang Pan, Zhikun Liu, Yuzhang Zhou, Fujian Yao, Jiang Ben, Li China University of Petroleum-Beijing Beijing China Engineering Technology R&D Company Limited CNPC Beijing China Bohai Drilling Engineering Company Limited CNPC China

ISBN: (纸本)9781713867821

Hydraulic fracturing is one of the most effective ways to promote oil and gas production, especially for unconventional hydrocarbon resources. However, for some unconventional reservoirs, such as ultra-deep tight sandstone formation and local stress intensified shale formation, the fracture initiation pressure is extremely high thus impeding hydraulic fracture initiation and extension. This paper provides a new hydraulic Pre - pressurized approach for the deduction of fracture initiation pressure. The 8 cm × 8 cm × 10 cm cuboid rock matrix was used to investigate the effect of pre-pressurized Pore pressure on the hydraulic fracture initiation pressure. results showed that as the pore pressure increased, the fracture initiation pressure decreased and a critical pre-pressurized pore pressure value existed. If the pore pressure exceeds this value, the hydraulic fracture initiation pressure would not be reduced. The hydraulic pressurized rate would decrease with the increase of pre-pressurized pore pressure. CT scan was also conducted and it indicated that the number of initialized hydraulic fractures around the wellbore has a positive relationship with the value of pre-pressurized pore pressure. Some additives such as acid and surfactant were also added to the fracturing fluid, according to the pre-pressurized experiments. The fracturing fluid with acid can reduce the fracture initiation pressure on a relatively big scale, while the fracturing fluid with surfactant can increase the complexity of hydraulic fracture networks. The experimental results clarify the mechanism of "pre-pressurized " to reduce rock fracture pressure, and form the optimization method of "pre-pressurized " modification fluid system formula regulation. The research results can provide a reference for field optimization of modification fluid system. © Geology resource Management and Sustainable development *** rights reserved.

关键词： Hydraulic fracturing

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double network self-healing hydrogel based on hydrophobic association and ionic bond for formation plugging

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Petroleum Science 2022年第5期19卷 2150-2164页

作者： Ying-rui Bai Qi-Tao Zhang Jin-Sheng Sun Guan-Cheng Jiang Kai-He Lv School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580ShandongChina CNPC Engineering Technology R&D Company Limited Beijing102206China College of Petroleum Engineering China University of Petroleum(Beijing)Beijing102249China

Self-healing hydrogels have attracted tremendous attention in the field of oil and gas drilling and production engineering because of their excellent self-healing performance after physical *** this study,a series of double network self-healing(dN_(SA))hydrogels based on hydrophobic association and ionic bond were prepared for plugging pores and fractures in formations in oil and gas drilling and production *** mechanical,rheological,and self-healing properties of the dN_(SA)hydrogels were *** revealed that the dN_(SA)hydrogels exhibited excellent mechanical properties with a tensile stress of 0.67 MPa and toughness of 7069 kJ/cm^(3) owing to the synergistic effect of the double *** addition,the dN_(SA)hydrogels exhibited excellent compression resistance,notch insensitivity,and self-healing *** dN_(SA)-2 hydrogel was granulated and made into gel particles with different particle sizes and used as a plugging *** self-healing mechanism of dN_(SA)-2 hydrogel particles in fractures was explored,and it’s plugging effect on fractures of different widths and porous media of different permeabilities were *** results revealed that the plugging capacity of the dN_(SA)-2 hydrogel particles for a fracture with width of 5 mm and a porous medium with a permeability of 30μm^(2) was 3.45 and 4.21 MPa,respectively,which is significantly higher than those of commonly used plugging agents in the *** dN_(SA)hydrogels with excellent mechanical and self-healing properties prepared in this study will provide a new approach for applying hydrogels in oil and gas drilling and production engineering.

关键词： Self-healing hydrogel Hydrophobic association Ionic bond Mechanical property rheological property Formation plugging

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Exploration of Precise Guidance technology for Thin reservoir In The West of The right Bank of The Amu darya river 13th

Exploration of Precise Guidance Technology for Thin Reservoi...

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13th International Field Exploration and development Conference, IFEdC 2023

作者： Gu, Yi-Xin Jin, Yu-Lai Hu, Chao Zhang, Liang Xiao, Yue Cheng, Wei-Heng Zhou, Hai-Qiu Li, Hang-Yuan Baletabieke, Bahedaer Li, Jing CNPC Engineering Technology R&D Company Limited Beijing102206 China College of Petroleum Engineering Beijing China National Engineering Research Center for Oil and Gas Drilling and Completion Technology Beijing China CNPC Chuanqing Drilling and Production Engineering Research Institute Beijing China AM River Natural Gas Company Beijing China Tianjin Petroleum Vocational and Technical College Tianjin China

ISBN: (纸本)9789819702558

The right bank of the Amu darya river is rich in natural gas resources and has huge development potential. At present, the main development block is the central and eastern part. With the development process, the recoverable reserves are decreasing year by year. The Baker Hughes Auto Trak rotary steerable tool was selected to address the drilling engineering challenges facing the development of thin reservoirs in the West. The research shows that the drilling method using conventional inclined tool combined with rotary steerable tool can effectively improve the control accuracy of well trajectory and improve the effective drilling rate of reservoir. A set of drilling assembly suitable for the thin reservoir is formed, which provides reliable engineering technical support for the safe and efficient development of gas fields. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Energy resources

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