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development and performance evaluation of a high temperature resistant, internal rigid, and external flexible plugging agent for water-based drilling fluids

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Petroleum 2023年第1期9卷 33-40页

作者： Zhe Xu Jinsheng Sun Li Li Kaihe Lv Jingping Liu Zhiwen dai Xianfa Zhang Zonglun Wang School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580China CNPC Engineering Technology R&D Company Limited Changping10206China Oil&Gas Technology Research Institute of Changqing Oilfield Company Xi'an710000China

during the drilling process for oil and gas production,a larger number of drilling fluids invade the formation,causing severe formation damage and wellbore collapsing,which seriously hinders the efficient production of deep oil and *** several plugging agents have been developed for efficient fracture sealing in recent years,the development of high-performance plugging agents with self-adaptive ability and high-temperature resistance remain a ***,we report the synthesis of an internal rigid and external flexible plugging agent PANS by reversed-phase emulsion polymerization with nano-silica as the rigid core and poly(acrylamide-co-N-vinylpyrrolidone)as a flexible *** plugging agent has a median particle size of 10.5μm and can self-adapt to seal the microfractures and fractures in the formation,leading to an effective reduction in the filtration loss of bentonite water-based drilling fluid under both low temperature and low pressure(LTLP)and high temperature and high pressure(HTHP)*** addition,compared with the neat nano-silica(500 nm),the sealing efficiency of PANS toward 100–120 mesh sand bed was increased by 71.4%after hot rolling at 180°C.

关键词： Internal rigidity External flexibility Plugging agent Filter loss reduction Plugging performance

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research on Fault diagnosis System of Key drilling Equipment Based on Internet of Things 13th

Research on Fault Diagnosis System of Key Drilling Equipment...

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13th International Field Exploration and development Conference, IFEdC 2023

作者： Luo, Xue-Li Jin, Yi Yang, Xiao-Guang Jia, deng Su, Yong Zhang, Yi Wang, Yong-Chao Chen, Bing-deng Bai, Han-Qin CNPC Engineering Technology R&D Company Limited Beijing China Beijing Kembl Petroleum Technology Co. Ltd. Beijing China

ISBN: (纸本)9789819702718

As the important equipment in the oil drilling rig system, the operation status of drilling pump and winch directly affects the safety and efficiency of oilfield drilling production. The existing inspection and maintenance of drilling equipment mainly rely on manual patrol inspection and post-maintenance. The intelligent monitoring and health diagnosis technology of drilling key equipment can help to realize the life cycle management of drilling key equipment and significantly improve the level of drilling equipment evaluation business. For the health monitoring and fault diagnosis analysis of drilling pump and winch, this paper focuses on the research and design of the online monitoring and fault diagnosis system of drilling pump and winch using the Internet of Things technology. This system can realize remote real-time monitoring and fault diagnosis of the drilling process, reduce the workload of on-site personnel, improve the management efficiency of equipment, and more safely ensure the exploration and development of oil and gas resources. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Failure analysis

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Critical Length Analysis for Linear Growth of Frictional resistance of Moving Flexible Screen String in Horizontal Borehole 13th

Critical Length Analysis for Linear Growth of Frictional Res...

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13th International Field Exploration and development Conference, IFEdC 2023

作者： Wang, Yong-Hong Gao, Xiang Liu, Xin-Yang Hu, Zhong-Zhi CNPC Engineering Technology R&D Company Limited Beijing102206 China School of Mechanical Engineering Sichuan University of Science and Engineering Sichuan644000 China

ISBN: (纸本)9789819702558

Aiming at the sand control problem of screen in ultra-short radius horizontal well, the influence factors of motion resistance and extension length of flexible screen are studied. Therefore, based on the theory of multi-body dynamics, a mathematical model of the downhole motion resistance of the flexible screen with spherical hinge connection was established, and the simulation model of the motion resistance of the flexible screen was constructed by AdAMS software, and the influence of multiple factors on the model of the pipe string was analyzed. The results show that the motion resistance of flexible screen increases exponentially with the increase of the total length of screen and the friction coefficient. There is a critical length with linear increase of motion resistance, and the main factors affecting the critical length are the length of screen element and the friction coefficient. Under limited thrust, increasing the length of the screen unit and reducing the downhole friction coefficient are beneficial to improve the critical length of flexible screens in downhole operations. In addition, considering the accumulation rate of downhole resistance, a local weight reduction method for flexible screen is proposed, which can not only improve the critical length, but also ensure the reliability and safety of the screen operation. This study aims to provide a theoretical basis for mastering the change law of motion resistance and extension length of flexible screen with spherical hinge connection, and provide a reference for the optimization design of flexible screen. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Friction

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development and Application of Wireless Strain Test System in the Bearing Capacity Test of Oil derrick 13th

Development and Application of Wireless Strain Test System i...

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13th International Field Exploration and development Conference, IFEdC 2023

作者： Jia, deng Zhou, Zhi-Xiong Yang, Xiao-Guang Luo, Xue-Li Li, Yang Jin, Ling Zuo, Wei-dong Zhang, Na Ma, Ying CNPC Engineering Technology R&D Company Limited Beijing China Beijing Kembl Petroleum Technology Co. Ltd. Beijing China

ISBN: (纸本)9789819702718

In order to ensure the safe production of oil drilling equipment, about 2000 sets of in-service oil drilling rigs and workover rigs need to be tested and evaluated every year, covering daqing, Changqing, southwest, Tarim, dagang and other major oil and gas fields as the key equipment of the drilling rig system, the bearing capacity of the derrick is directly related to the safety of production. In view of the complex data transmission line, low efficiency and high labor intensity of the wired strain tester, a wireless strain testing system with the function of testing and analyzing the bearing capacity of derrick is developed the integration of wireless transmission of derrick bearing capacity test data, on-line analysis and load capacity evaluation is realized. Through the quasi-calibration of Beijing Institute of Metrology and Field Test of Oil derrick, it is proved that the research results have high accuracy in strain detection (JJG623–2005), strong stability, high efficiency, low power consumption, friendly interpersonal interface and broad application prospects. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Bearing capacity

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Evaluation of the combined influence of geological layer property and in-situ stresses on fracture height growth for layered formations

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Petroleum Science 2024年第5期21卷 3222-3236页

作者： Peng Tan Zhao-Wei Chen Liu-Ke Huang Qing Zhao Sha-rui Shao CNPC Engineering Technology R&D Company Limited Beijing102206China National Engineering Research Center for Oil&Gas Drilling and Completion Technology Beijing102206China School of Civil Engineering and Geomatics Southwest Petroleum UniversityChengdu610500SichuanChina Shale Gas Research Institute Southwest Oil&Gas Field CompanyChengdu610500SichuanChina

Fracture geometry is important when stimulating low-permeability reservoirs for natural gas or oil production. The geological layer(GL) properties and contrasts in in-situ stress are the two most important parameters for determination of the vertical fracture growth extent and containment in layered rocks. However, the method for assessing the cumulative impact on growth in height remains ambiguous. In this research, a 3d model based on the cohesive zone method is used to simulate the evolution of hydraulic fracture(HF) height in layered reservoirs. The model incorporates fluid flow and elastic deformation, considering the friction between the contacting fracture surfaces and the interaction between fracture components. First, an analytical solution that was readily available was used to validate the model. Afterwards, a quantitative analysis was performed on the combined impacts of the layer interface strength, coefficient of interlayer stress difference, and coefficient of vertical stress *** results indicate that the observed fracture height geometries can be categorized into three distinct regions within the parametric space: blunted fracture, crossed fracture, and T-shaped ***, the results explained the formation mechanism of the low fracture height in the deep shale reservoir of the Sichuan Basin, China, as well as the distinction between fracture network patterns in mid-depth and deep shale reservoirs.

关键词： deep shale Hydraulic fracturing HF propagation Fracture interaction Cohesive zone method

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Study on Fracture Propagation in Tight Sandstone by Large-Scale Physical Simulation Experiments 12th

Study on Fracture Propagation in Tight Sandstone by Large-Sc...

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12th International Field Exploration and development Conference, IFEdC 2022

作者： Li, Jia-Ying Qi, Chun-Yan Wu, Bo-Hong Gu, Ye Zhou, Tuo CNPC Engineering Technology R&D Company Limited Beijing China CNPC Research Institute of Petroleum Exploration and Development Beijing China

ISBN: (纸本)9789819919635

Physical simulation experiment on hydraulic fracturing is an effective and reliablemethod to understand the initiation and propagation of hydraulic fractures. However, shale and cement samples are mostly used in current experiments, while tight sandstone is seldom studied. Besides, the experiments are usually conducted with single-stage fracturing, ignoring the interaction between fractures in the actual fracturing. In this paper, a pioneer large-scale physical simulation experiment is conducted by multi-stage hydraulic fracturing to reveal the initiation and propagation of fracture in tight sandstone. Two groups of tight sandstone samples were prepared as the size of 28 × 28 ×36,where four circular notches were designed on the wellbore to represent fracturing clusters. The tests were performed by a large block polyaxial stress frame and the acoustic emissions data were observed to indicate the features of fracture complexity. Consequently, the effects of hydraulic fracture interaction, pumping rate and rate pulsing on fracture propagation were studied. The results showed that the simple fractures were mainly formed in tight sandstone, while the complex fractures were rarely formed since the mutual inhibition between fractures under stress shadow. The fracture initiation and breakdown pressures increase gradually with the pump rate, while the rate change has no significant effect on the fracture radius. The rate pumping can effectively increase fracture complexity, further improving the effect of reservoir stimulation. This work successfully reveals the effects of different factors on fracture initiation and propagation, offers an innovative method of physical simulation experiment on hydraulic fracturing, and provides a significant reference for fracturing design optimization of tight sandstone. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2023.

关键词： Fracture

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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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Study on sealing integrity mechanism of salt cavern hydrogen storage under alternating load 57

Study on sealing integrity mechanism of salt cavern hydrogen...

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57th US rock Mechanics/Geomechanics Symposium

作者： He, Aiguo Ma, Qingyuan Liu, Tianen Li, Jingcui Zhang, Hong dai, Kun Lu, Yunhu CNPC Engineering Technology R&D Company Limited Beijing China China Unversity of Petroleum Beijing China

ISBN: (纸本)9780979497582

The sealing integrity of salt cavern hydrogen storage is an important technology and safety index of hydrogen storage. In the process of injection and production, the surrounding rock of hydrogen storage chamber is in the state of alternating load stress, and there is the risk of fatigue failure and leakage. Analysis of dynamic rock mechanics characteristics of surrounding rock of salt cavern hydrogen storage chamber under alternating load is the key to study the sealing integrity mechanism of salt cavern hydrogen storage chamber. Uniaxial tests, triaxial tests, cyclic loading and unloading tests and creep tests were carried out on rock samples from salt layer, interlayer and cap layer of hydrogen storage reservoir of Jintanmao 17 well by means of rock mechanics experimental machine rTr-1500. The deformation and failure characteristics, permeability, porosity, breakthrough pressure and other parameters of rock samples under alternating loads were discussed. Based on the results of the creep test, the Burgers creep model parameters for this block were fitted. The results show that: (1) in the triaxial cyclic loading and unloading experiment, the cyclic loading and unloading before the yield point decreases the porosity and permeability of the rock sample, while the cyclic loading and unloading after the yield point increases the porosity and permeability of the rock sample.(2) In the process of cyclic loading and unloading, the dissipative energy of cap rock is greater than that of interlayer, and with the increase of cycle times, the dissipative energy first decreases and then becomes stable.(3)Burgers creep model can well reflect the creep law of salt formation in the target block, and can be used to study the long-term stability of hydrogen storage cavity. The research results provide a scientific basis for the design and operation of salt cavern hydrogen storage. © 2023 57th US rock Mechanics/Geomechanics Symposium. All rights reserved.

关键词： Creep

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research on the rock cutting mechanism of non-planar PdC cutters based on the drucker-Prager criterion 57

Research on the rock cutting mechanism of non-planar PDC cut...

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57th US rock Mechanics/Geomechanics Symposium

作者： Sun, Yuqi Liu, Li Jiang, Haichao Yu, Jinping Ji, Guodong Wu, Qiang Chen, Changchang CNPC Engineering Technology R&D Company Limited Beijing102206 China International Engineering Company BHDC Tianjin300450 China

ISBN: (纸本)9780979497582

Non-planar PdC cutters are widely used to solve these problems of wear and breakage of conventional PdC cutters when drilling hard rock formations. In this paper, the finite element method is adopted to study the rock-breaking characteristics of non-planar PdC cutters. The effects of the cutting parameters on the rock-breaking efficiency of a non-planar PdC cutter are analyzed. The mechanical specific energy (MSE) of non-planar PdC cutters is smaller. The rate of penetration (rOP) is higher, and the aggressiveness is stronger. The influence of different cutting parameters on the rock-breaking efficiency of four types of PdC cutters is analyzed. The results indicate that the optimum cutting depth is in the range of 1.5-2 mm, and the optimum cutting angle is in the range of 15°-20°. Based on the finite element simulation results, a personalized PdC bit is designed and successfully applied to Yang101HXX-3 well. The research results can provide a theoretical basis for the selection, structure optimization, drilling bit design, and application of efficient PdC bits. © 2023 57th US rock Mechanics/Geomechanics Symposium. All rights reserved.

关键词： Finite element method

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design Method and reliability Analysis of deep Well Casing Strength

Design Method and Reliability Analysis of Deep Well Casing S...

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International Petroleum and Petrochemical technology Conference 2024, IPPTC 2024

作者： Yaxuan, Wang Jiayu, He Hongzhi, Xue Zhiyong, Wei Wang, Lin Weixing, Zhu CNPC Engineering Technology R&D Company Limited Beijing102206 China EnerTech-Drilling & Production Co. CNOOC Energy Technology & Servies Limited Tianjin300452 China

With the development of the petroleum industry, more and more oil fields are beginning to engage in deep well exploration. deep well casing is an important drilling equipment in oilfield development, which is a key factor in ensuring wellbore stability, maintaining production safety, and improving production capacity. However, due to the high requirements for equipment in drilling operations, problems in the design, manufacturing, and installation of deep well casing can easily lead to issues such as poor wellbore stability, oil leakage, and drilling accident safety. Therefore, the performance and reliability evaluation of deep well casing has become a key issue. This article summarizes the research progress of deep well casing strength design methods and reliability analysis through extensive research on existing literature. The main content includes the working principle, design standards, and advantages and disadvantages of different methods of deep well casing, aiming to provide reference for the design and use of deep well casing. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： deep oil well drilling

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