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2022 SPE EuropEC - Europe Energy Conference featured at the 83rd EAGE Annual Conference and Exhibition, EUrO 2022

作者： Ma, Weizhen Guan, Zhichuan Yan, Yan Li, Cheng School of Petroleum Engineering China University of Petroleum China Northeast Petroleum University China CNPC Engineering Technology R&D Company Limited

ISBN: (纸本)9781613998656

The CO2 physical parameters are greatly influenced by the wellbore temperature and pressure during the offshore burial process, but the existing model does not take this into account resulting in poor calculation accuracy, which brings large errors to the later wellbore load calculation and wellbore integrity evaluation. Based on heat transfer and other basic theories, a wellbore temperature and pressure calculation model was established. the calculation method of CO2 physical parameters required for the model was determined, and finally the established model was solved by iterative calculations to obtain the temperature and pressure distribution of the wellbore and the change law of physical parameters, and the effect of injection parameters on the wellbore temperature and pressure was analyzed. Taking a buried well in the South China Sea as an example, the analysis found that as the well depth increased, the wellbore temperature and pressure increased approximately linearly, and constant pressure specific heat capacity, Nusselt number and convective heat transfer coefficient of CO2 fluid increased, while the density, viscosity, friction coefficient, thermal conductivity and Prandtl number decreased. An increase in injection temperature decreases the temperature gradient, but has little effect on the pressure gradient and bottomhole temperature and pressure;an increase in injection volume decreases the temperature gradient and increases the pressure gradient, and the bottomhole temperature can be effectively regulated by the injection volume;the injection pressure has a certain effect on the temperature gradient at low pressure, but has a most no effect on the pressure gradient, and the bottomhole pressure can be effectively regulated by the injection pressure. © 2022, Society of Petroleum Engineers.

关键词： Iterative methods

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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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development of High Temperature resistant Soft Metal Sealing Components in downhole Tools

Development of High Temperature Resistant Soft Metal Sealing...

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2024 International Petroleum technology Conference, IPTC 2024

作者： Guo, Huijuan Li, Jianghao Song, Xiping Guodong, david Zhan Wang, Baodong Drilling Mechanical Department CNPC Engineering Technology R&D Company Limited China State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing China Drilling Technology Division EXPEC Advanced Research Center Saudi Aramco Saudi Arabia

ISBN: (纸本)9781959025184

The sealing components plays the role of sealing and pressure resistance of downhole tools, which is a key component that determines the safe and reliable operation of downhole tools. With the development of oil and gas exploitation towards deep and ultra-deep wells, the performance requirements of sealing components for downhole tools are gradually improved. rubber materials are prone to aging and deterioration in downhole high temperature and corrosive environment, resulting in sealing failure and difficulty in maintaining good sealing for a long time. Soft metal materials have the characteristics of high temperature resistance, high sealing pressure and corrosion resistance. The application of high temperature resistant soft metal materials in petroleum engineering sealing components can better solve the problem of aging failure of rubber sealing components, which is of great significance for ensuring the safety of downhole sealing. Based on the introduction of the application of soft metal materials in petroleum engineering, this paper studies the refining method of copper-based soft metal materials, and determines the formula of soft metal materials with excellent performance by analyzing the microstructure of soft metal materials. Based on the developed soft metal material, the high temperature tensile mechanical properties test, high temperature elastic modulus test were carried out. The feasibility of using copper-based soft metal as sealing element in petroleum engineering was analyzed, and the soft metal sealing element for expansion pipe sealing was designed. The research results show that: (1) Metal material seals have been widely studied at home and abroad, and some products have been maturely applied in the market, with good mechanical properties and sealing performance. (2) By adding Ga, rh, Si and other alloying elements to copper metal, the metal wettability, temperature resistance and elastic properties of the material can be improved, and the seal

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A dynamic managed pressure well-control method for rapid treatment of gas kick in deepwater managed pressure drilling

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Petroleum Science 2022年第5期19卷 2297-2313页

作者： Hong-Wei Yang Jun Li Ji-Wei Jiang Hui Zhang Bo-Yun Guo Geng Zhang Wang Chen China University of Petroleum-Beijing Beijing102249China China University of Petroleum-Beijing at Karamay Karamay834000XinjiangChina CNPC Engineering Technology R&D Company Limited Beijing102206China University of Louisiana at Lafayette LafayetteLA70504USA

during deepwater managed pressure drilling(MPd),the gas kick may occur in abnormally high-pressure *** the traditional well control method is adopted,the treatment time is long and the advantage of early gas kick detection of MPd is *** dynamic managed pressure well-control(MPWC)method can be used to rapidly treat gas kick in deepwater *** this paper,considering the effect of large-variable-diameter annulus and complex wellbore temperature in deepwater drilling,a simplified model of non-isothermal gas-liquid two-phase flow was established for dynamic deepwater MPWC *** this model,the response characteristics of outlet flow and wellhead backpressure were *** results indicated that the gas fraction,outlet liquid flow rate,pit gain and wellhead backpressure presented complex alternating characteristics when gas moved upwards in the wellbore due to the large-variable-diameter *** outlet liquid flow rate would be lower than the inlet flow rate and the pit gain would decrease before the gas moved to the *** variation trend of the wellhead backpressure was consistent with that of the pit *** the gas-liquid mixture passed through the choke,the expansion or compression of the gas caused part of the choke pressure drop to be supplemented or unloaded,delaying the response rate of the wellhead *** wellbore temperature,borehole diameter and seawater depth had different effects on outlet flow rate,pit gain and wellhead *** research could provide a new idea for well control methods in deepwater managed pressure drilling.

关键词： Gas kick Managed pressure well-control Gas-liquid two-phase flow Wellhead backpressure Outlet flow characteristics deepwater managed pressure drilling

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development and Application of Full Vector Geosteering Comprehensive Analysis Software-OneSteer 11th

Development and Application of Full Vector Geosteering Compr...

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11th International Field Exploration and development Conference, IFEdC 2021

作者： Lin, Wang Wu, dong Liu, Lifeng Zhu, Weixing Xue, Hongzhi CNPC Engineering Technology R&D Company Limited Beijing China PetroChina Research Institute of Petroleum Exploration and Development Beijing China

ISBN: (纸本)9789811921483

Horizontal well technology is a favorable means for the efficient development of "deep, low permeability, offshore, unconventional" and other complex reservoirs, and its key is to improve the drilling rate of the target geological body. Based on the analysis of the business process and requirements of geosteering, aiming at the geological characteristics of China's continental shale, carbonate and glutenite reservoirs, the key technical problems such as geo-steering based stratigraphic structure model modeling, main LWd instrument curve forward modeling, interactive geological model editing, dynamic extraction of stratigraphic parameters, multi-information fusion seismic inversion and so on have been solved, and a full vector geosteering comprehensive analysis software named OneSteer was developed. The software is applied to the field geo-steering analysis of carbonate reservoir in southwest of China and shale reservoirs in Xinjiang oilfields, which improves the drilling encounter rate, reduces the drilling risk, improves the drilling efficiency, and achieves satisfactory results. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Extraction

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Analysis of Low-Pressure Operation Stability of Underground Hydrogen Storage Salt Cavern 56

Analysis of Low-Pressure Operation Stability of Underground ...

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56th U.S. rock Mechanics/Geomechanics Symposium

作者： dong, Jingnan Zhuang, Xiaoqian Gong, danni Ban, Fansheng Zhang, Yingbin CNPC Engineering Technology R&D Company Limited Beijing China China University of Petroleum-Beijing Beijing China HydroChina-ITASCA R&D Center Hangzhou China

ISBN: (纸本)9780979497575

In order to meet today's increasing fluctuations in energy demand, large-scale underground salt rock gas storage is widely used in the storage of fuels, including natural gas, oil and hydrogen. From the perspective of macroscopic structure and stratigraphic structure, the Jintan salt deposit in China has good sealing properties, and is an ideal solution mining area for the construction of salt rock gas storage. Salt rock has extremely low permeability and self-repairing properties, which greatly increase the sealing performance of the gas storage. Underground salt cavern hydrogen storage has been proved feasible in some area worldwide. The molecular weight of hydrogen is extremely low, so it has high requirements on the sealing performance of hydrogen storage, especially in terms of long-time storage. In this paper, two geo-mechanical models are established as one single-cavern configuration and 4-cavern configuration to analyze the stability of the hydrogen storage in terms of cavity volume shrinkage, stress distribution of rock mass around caverns, and surface subsidence. Through numerical simulation using FLAC3d, the evolution law under long-time low-pressure conditions is investigated. The tightness and stability of the trap conditions of the salt interval are studied, and the reasonable low operating pressure range of the salt rock hydrogen storage is proposed. The study found that under the condition of ensuring the stability of the salt cavity, the gas storage should keep the operating pressure from 8 MPa to 9 MPa at the depth around 800 to 1000 m. The long-term constant pressure operation at lower and higher limit did not see obvious salt cavity tensile stress concentration areas within 30 years, and the salt cavity expansion area was concentrated in the local area. For most salt cavern hydrogen storages of 800 to 1000 meters depth, 8.27 MPa is an acceptable operational pressure. Considering the surface subsidence, it is necessary to pay more attention when

关键词： Mining

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Insights into the carbonate/bicarbonate ion-induced failure mechanism of bentonite in drilling fluids

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Journal of Molecular Liquids 2025年 417卷

作者： deng, Xuefei Lv, Kaihe Qiao, Huotong Li, Jian Sun, Jinsheng Huang, Ning Fan, Junhao Liao, Ting Qingdao266580 China CNPC Engineering Technology R&D Company Limited Beijing102200 China Engineering Technology Department of CNPC Chuanqing Drilling Engineering Co. Ltd. Chengdu610000 China

during deep oil and gas drilling, drilling fluids are often polluted with carbon dioxide (CO2). The intrusion of CO2 can affect bentonite performance, leading to deterioration or even failure of drilling fluids. To further investigate the influence of CO2 pollution on the bentonite and its failure mechanism, Na2CO3 simulation experiments were conducted. Performance evaluation showed that as the concentration of HCO3− and CO32− increased, the viscosity, filtration loss, and mud cake permeability of drilling fluids significantly increased. Meanwhile, the drilling fluid foaming was particularly evident. Mechanism studies indicated that the adsorption of HCO3− and CO32− on the bentonite diminished the electrostatic interactions and interlayer spacing between particles, leading to the particles aggregation and a decrease in Zeta potential, ultimately causing the hydration film on the bentonite to become thinner. Simultaneously, this also led to a decline in the dispersibility of bentonite. This study can offer a new research thread for the failure mechanism of bentonite under CO2 pollution and indicate the direction for the study of drilling fluid resistance to acidic gas pollution. © 2024 Elsevier B.V.

关键词： drilling fluids

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research on online correction method of dynamic ampacity parameters of submarine cable based on optical fiber temperature measurement 4

Research on online correction method of dynamic ampacity par...

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2024 4th International Conference on Optics and Communication technology, ICOCT 2024

作者： Li, Cunyi Zhang, Bo Hu, Peng Huo, Peng New Energy Engineering Technology Company Limited Beijing100034 China National Energy Wind Power Operation Technology R&D Center Xian710309 China

ISBN: (纸本)9781510685734

An on-line correction method for dynamic ampacity parameters of submarine cables based on optical fiber temperature measurement is proposed. First, through sensitivity analysis, find the material parameters that have a greater impact on the calculation of the current carrying capacity of IEC60853. Then, in the submarine cable real-time monitoring system, current data that meets certain characteristics and corresponding fiber temperature measurement data are extracted, and the conductor temperature is calculated by the thermal circuit method. Compared with the conductor temperature calculated by IEC60853, particle swarm optimization algorithm is used to modify the material parameters online, so as to reduce the error of IEC60853 in calculating the dynamic current carrying capacity. Finally, a 220KV three-core photovoltaic composite submarine cable from an offshore wind farm in Yancheng is taken as an example to verify the effectiveness of the method. © 2024 SPIE.

关键词： Sensitivity analysis

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Numerical Simulation of Effects of Shock Waves on the Integrity of Cement Sheath

Numerical Simulation of Effects of Shock Waves on the Integr...

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2022 International Petroleum technology Conference, IPTC 2022

作者： Zhan, Guodong david Xu, Jianhui Aljohar, Abdulwahab Guo, Huijuan Drilling Technology Division EXPEC Advanced Research Center Saudi Aramco Saudi Arabia CNPC Engineering Technology R&D Company Limited China

ISBN: (纸本)9781613998335

With the application of electrical explosion technology in the oil industry, such as plugging removal, wax removal and micro-cracks generation near the wellbore zone, the impact of shock wave generated by the electrical explosion on cement sheath cannot be ignored. To study the effect of electrical explosion downhole application on the integrity of cement sheath during the operation, a numerical simulation was used. A composite model of casing-cement sheath-rock is established in AUTOdYN. The propagation process of shock waves in the composite and the damage to cement sheath are studied. The results show that the shock wave propagates through the perforation hole in the liquid and keeps a high pressure in the perforated area. In the nonperforated area, the shock wave decays greatly after passing through the casing pipe. When the cement sheath and rock are subjected to the shock waves, the damage area extends outward from the perforation hole. The cement sheath and rock are mainly subjected to the tensile and shear damage by the shock waves. What is more, the casing deformation caused by shock waves may also contribute to the damage of cement sheath behind the casing. Copyright © 2022, International Petroleum technology Conference.

关键词： Shock waves

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Pilot Tests of Enhanced Oil recovery by Integrating Conformance Control Treatment and Surfactant Flooding for Low Permeability reservoirs

Pilot Tests of Enhanced Oil Recovery by Integrating Conforma...

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Abu dhabi International Petroleum Exhibition and Conference 2022, AdIPEC 2022

作者： Zhou, Nancy Chun Lu, Meng Liu, Yajun Li, Jianshen Liu, Fuchen Li, Wenhong Wu, Xinwei rao, Tianli Zhao, Kun Yang, Lu Wang, Yajun Gu, renchao CNPC USA United States CNPC Engineering Technology R&D Company Limited PetroChina Changqing Oilfield Company National Engineering Laboratory for Exploration Development of Low-Permeability Oil & Gas Fields China

ISBN: (纸本)9781613998724

For fractured low permeability reservoirs, there are challenges to enhance oil recovery after water flooding with high water cut contents. Because of unsatisfied surfactant polymer flooding, we explored the integrated EOr techniques of conformance control treatment and surfactant flooding. This paper analyzes the results of pilot tests with four injectors and 16 producers and concludes the effectiveness of integrated EOr techniques. Based on lab results of conformance control core flooding tests and surfactant based chemical EOr reservoir core flooding experiments, we did pilot simulation studies to develop pilot design parameters. Then through history match and detailed compositional simulation, we made EOr integrated technology design and compared several injection scenarios by predicting the potential performance. Finally, an integrated EOr technique with two conformance control treatments and surfactant flooding was selected and executed for three injectors in the interested pilot block. For the fourth injector, only surfactant flooding was used to compare. Lab results of conformance control core flooding tests showed the efficiency of plugging and a good fluid diversion performance of conformance polymer agents. Surfactant based chemical EOr reservoir core flooding experiments resulted from 70% to 98% residual crude oil recovery. The experimental data obtained was implemented in a numerical simulator model to find the potential incremental recovery associated with conformance control treatments and chemical flooding. A refined sector model used to further evaluate the effect of them. Positive simulation results boost pilot tests. Five fluid injection slugs including the cleaning slug, pre-flooding slug, near wellbore plugging slug, in deep conformance control slug, and surfactant flooding slug were run for three injectors in the range of eight to ten months of treatment. In the interested pilot block, the monthly decreasing rate of oil production dropped from 3

关键词： Low permeability reservoirs

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