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56th U.S. rock Mechanics/Geomechanics Symposium

作者： Li, Xingbao Ban, Fansheng Zhu, Yujie Luo, Jiangwei Chen, Shaoyun Jin, Sheng Che, Zhenhua dong, Jingnan The Second Gas Production Plant of Petro China Changqing Oilfield Company Yulin China CNPC Engineering Technology R&D Company Limited Beijing China China University of Petroleum Beijing China Drilling Engineering Technology Research Institute Daqing Drilling and Exploration Engineering Company Daqing China Petroleum Engineering Research Institute of Dagang Oilfield Tianjin China Sinopec Zhongyuan Oilfield Engineering Service Management Center Henan China

ISBN: (纸本)9780979497575

drilling mud loss is of crucial importance in drilling. Lost circulation will extend the well construction period, cause investment losses, and even cause serious downhole accidents. In the Mizhi block of Changqing Oilfield targeted by this research, serious leakage occurred in many wellbore drilling processes, which has seriously affected the development of the block and caused economic losses. This paper focuses the mud loss during the drilling process of more than 200 wells in the Mizhi block, and counts the key loss data such as the lost horizons, the amount of lost drilling fluid, the average leak rate, and the density of the drilling fluid, and fully analyzes the possible reasons of the lost circulation. Collecting logging data, modeling geomechanics of some key wells and formations and taking cores. Finally, the geomechanical model is established. Analyzing the logging data and the specific leakage situation, the leakage mainly comes from fracture, and the leakage horizons mainly locate at the bottom of the Liujiagou Formation, the entire interval of the Shiqianfeng Formation and the top of the Shihezi Formation. Most of the mud loss sections are sand-mudstone interbeds. Geomechanical analysis shows that the rock mechanical strength of the entire interval is difficult to support the stability of the wellbore under the drilling fluid density of 1.1 grams per cubic meter, but the block loss pressure is generally between 1.1-1.2 grams per cubic meter. Collapse and leakage coexist in the wellbore. This study gives the method of drilling fluid optimization, and gives the possible reasons for the leakage from the perspective of geomechanics, which has important guiding significance for the further development of the Mizhi block. © 2022 ArMA, American rock Mechanics Association.

关键词： drilling fluids

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Case study: In-situ stress characteristics and fracture zone activation analysis of Changning shale gas in Sichuan Basin 55

Case study: In-situ stress characteristics and fracture zone...

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55th U.S. rock Mechanics / Geomechanics Symposium 2021

作者： Zhaowei, Chen Hu, Cao Yuanhui, Shi Jianhui, dong CNPC Engineering Technology R&D Company Limited Beijing China Beijing China Sinopec Jianghan Petroleum Engineering Co. Ltd Hubei Qianjiang China CNPC Emergency coordination office Beijing China

ISBN: (纸本)9781713839125

In the Changning Shale Gas development blocks in Sichuan Basin, casing deformation seriously restricted the efficient development of shale gas. Based on stress quadrilateral principle, the in-situ stress model of Changning area is established. The seismic and microseismic data were used to analyze the characteristics of fracture zone. Based on the principle of critical stress fault, the mechanical activity of fracture zone was analyzed. Finally, the in-situ stress characteristics, fracture zone development and fracture zone activity of Fuling block and Barnett block were discussed. The results showed that Changing area is in the reverse strike slip stress mode, and the difference between the shear stress and the sliding resistance on the fracture zone with high dip angle is the minimum, which is the internal reason why the fracture zone is easy to be activated. The sliding resistance on the fracture zone is greatly reduced by fracturing operation, which is the external reason for the fracture zone sliding induced by fracturing. This result states the geomechanical reasons of casing deformation in Changning area, which provides theoretical significance to solve the problem of casing deformation in Changning area. Copyright © 2021 ArMA, American rock Mechanics Association.

关键词： deformation

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Evaluation of Well Performance of Child Wells with Complex Fracture Hits from Parent Wells 55

Evaluation of Well Performance of Child Wells with Complex F...

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55th U.S. rock Mechanics / Geomechanics Symposium 2021

作者： Liu, Chuxi Liu, Ziping Shen, Jianguo Zhang, Ping Wang, Yonghong Yang, Zhenzhou Yu, Wei Sepehrnoori, Kamy The University of Texas at Austin AustinTX United States CNPC Chuanqing Drilling Engineering Company Limited Chengdu China CNPC Engineering Technology R&D Company Limited Beijing China Sim Tech LLC HoustonTX United States

ISBN: (纸本)9781713839125

An efficient numerical method using simple structured grids for accurate modelling of shale production with complex hydraulic fractures and natural fracture networks is very important to evaluate the impacts of frac hits. In this study, we applied a powerful non-intrusive EdFM (Embedded discrete Fracture Model) method in conjunction with a traditional reservoir simulator with structured grids to simulate shale gas production under different degrees of frac hits. Through the non-intrusive EdFM method, natural fractures that are connected with primary hydraulic fractures can be easily embedded into the structured grids without the need of unstructured grids and local grid refinement. We built a field-scale shale gas reservoir model with a parent/child horizontal well set and a stochastic distribution of inter well natural fractures. We performed a short term (3-year) production simulation with a flowing bottomhole pressure constraint that has a similar decline trend to the field observation. The gas flow rate and cumulative gas production for the three designed frac hits scenarios are plotted and compared. In addition, pressure distributions in matrix and fractures, and drainage volumes for the three designed scenarios after 1 year and 3 years of production are visualized and compared. Understanding the impact of inter well frac hits on well performance in shale reservoirs with the non-intrusive EdFM method provides significant insights for the spacing/drilling job optimization of unconventional resources. © 2021 ArMA, American rock Mechanics Association

关键词： Stochastic systems

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A Novel Method to determine the drilling Fluid density for Gypsum-Salt Layer

A Novel Method to Determine the Drilling Fluid Density for G...

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2021 Abu dhabi International Petroleum Exhibition and Conference, AdIP 2021

作者： Liu, Jitong Li, Wanjun Zhou, Haiqiu Gu, Yixin Jiang, Fuhua Zhang, Guobin Zhou, Shiying Liu, Haixiao Liao, Chao Wang, Shengqiang Zhou, Zhifeng CNPC Engineering Technology R&D Company Limited China National Offshore Oil Corporation China Xibu Drilling Directional Well Co. Ltd

ISBN: (纸本)9781613998342

The reservoir underneath the salt bed usually has high formation pressure and large production rate. However, downhole complexities such as wellbore shrinkage, stuck pipe, casing deformation and brine crystallization prone to occur in the drilling and completion of the salt bed. The drilling safety is affected and may lead to the failure of drilling to the target reservoir. The drilling fluid density is the key factor to maintain the salt bed's wellbore stability. The in-situ stress of the composite salt bed (gypsum-salt -gypsum-salt-gypsum) is usually uneven distributed. Creep deformation and wellbore shrinkage affect each other within layers. The wellbore stability is difficult to maintain. Limited theorical reference existed for drilling fluid density selection to mitigate the borehole shrinkage in the composite gypsum-salt layers. This paper established a composite gypsum-salt model based on the rock mechanism and experiments, and a safe-drilling density selection layout is formed to solve the borehole shrinkage problem. This study provides fundamental basis for drilling fluid density selection for gypsum-salt layers. The experiment results show that, with the same drilling fluid density, the borehole shrinkage rate of the minimum horizontal in-situ stress azimuth is higher than that of the maximum horizontal in-situ stress azimuth. However, the borehole shrinkage rate of the gypsum layer is higher than salt layer. The hydration expansion of the gypsum is the dominant reason for the shrinkage of the composite salt-gypsum layer. In order to mitigate the borehole diameter reduction, the drilling fluid density is determined that can lower the creep rate less than 0.001, as a result, the borehole shrinkage of salt-gypsum layer is slowed. At the same time, it is necessary to improve the salinity, filter loss and plugging ability of the drilling fluid to inhibit the creep of the soft shale formation. The research results provide technical support for the safe drilling

关键词： Boreholes

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research and application of supramolecular gel plugging agent in abnormal pressure reservoir 10

Research and application of supramolecular gel plugging agen...

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10th Global Conference on Materials Science and engineering, CMSE 2021

作者： Baletabieke, B. Gu, Y.X. Zhou, T. duan, d.X. Liu, J.T. Kong, X.J. Qian, F. Li, W.J. Zhong, Z. Xiang, Y. Jing, N. Li, J.Y. CNPC Engineering Technology R&D Company Limited Beijing102206 China China National Oil and Gas Exploration and Development Corporation Beijing100034 China

The Aktobe project is the largest oil and gas producing area of PetroChina in Central Asia. However, after years of exploitation, the pressure of the reservoir has dropped, making it difficult to increase the production of a single well. Both the Kenkyak block and North Troyes block of the project have induced fractured leakage, and frequent leakage affects safe and efficient drilling and completion operations and production. Therefore, the research on leakage prevention and control technology is very necessary. This article focuses on the characteristics of the cracks in the high-pressure area of the Kenkyak block and the cracks in the low-pressure area of the North Troyes block. Aiming at the fracture characteristics of the high-pressure zone in the Kenkyak block and the low-pressure zone in North Troyes block, and taking advantage of the synergistic effect of supramolecules, a supramolecular plugging-while-drilling agent was developed based on the deformable fiber composite gel. It forms a strong adhesion plugging layer on the inner wall of the leakage channel through the strong adhesion force, and it achieves a good plugging effect. The 300-500md sand disc bearing pressure could reach 700psi when adding 3% agent, and the bearing pressure of 3-5d permeability sand disc could reach above 450psi. A supramolecular static plugging agent was also developed based on the dilatant gel. It is rich in strong shear reversible gel with supramolecular structure, which guarantees its pumpability and plugging performance. The effective rate of one-time plugging is over 80%, and the viscosity is greatly reduced after the gel is broken for 72hr, which benefits the reservoir protection. © 2021 Institute of Physics Publishing. All rights reserved.

关键词： Adhesion

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Study on the design method of distorted model testing for cementing casing string systems based on the similarity of stiffness and mass

Journal of Engineering Research (Kuwait)

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Journal of engineering research (Kuwait) 2025年

作者： Wang, Liyan Yin, Yiyong Qi, Linshan Qu, Congfeng Yu, Yongjin Liu, Binhui Xia, Xiujian College of Engineering China Agricultural University Beijing 100083 China CNPC Engineering Technology R&D Co. Ltd Beijing 102206 China

In the test design of large-scale scaled models (complete similarity models) of the cementing casing string systems (CCSS), the large length-diameter ratio of the casing string causes the wall thickness of model too thin to manufacturing. Therefore, this study proposes a test design method based on similarity in stiffness and mass for the unequal scale scaled models (distorted similarity models) of the CCSS. Firstly, a dynamic model of the CCSS is established and solved by the separation of variables method and modal superposition method. The accuracy of the dynamic model and the efficiency of the solution are verified by tests and finite element analysis respectively. Then, based on the dynamic model and its analytical solution, the equation analysis method is used to derive the similarity criteria for the complete similarity model of the system. Based on theoretical calculations, it is found that the predicted vibration characteristics and dynamic response results of the prototype system through the complete similarity model are highly accurate. To further solve the problem of difficulty in manufacturing complete similarity model tests with large scaling ratios, considering the similarity of the quality and stiffness of the CCSS, the similarity criteria for the distorted similarity model of the CCSS is derived. In order to achieve high accuracy in theoretical calculation and prediction, the length-diameter ratio of the model needs to be greater than 60. The correctness of predicting the prototype dynamic response through the distorted similarity criterion is verified through theoretical models and test, and a detailed process for designing the similarity model experiment of the CCSS is provided. Finally, robustness analysis, sensitivity analysis, and uncertainty analysis are conducted on the dynamic response and similarity criteria of the CCSS under different parameters. The analysis results indicate that the similarity criterion can accurately predict the vibrati

关键词： Cementing casing string system Complete similarity model distorted similarity model Equation analysis method Model test

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Integration Cementing technology for Ultra-deep HTHP High Salinity and High Hydrogen Sulfide Well 11th

Integration Cementing Technology for Ultra-deep HTHP High Sa...

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11th International Field Exploration and development Conference, IFEdC 2021

作者： Gu, Yi-xin Baletabieke, Bahedaer Chen, Chi Han, Fei Qian, Feng Xiao, Yue Xiang, Ying Jing, Ning du, Yu Xiao, Xu CNPC Engineering Technology R&D Company Limited Beijing China Exploration Division PetroChina Southwest Oil and Gasfield Company Chengdu China China National Oil and Gas Exploration and Development Company Ltd. Beijing China China Petroleum Longhui Automation Engineering Co. Ltd. Langfang China China Petroleum Maintenance and Emergency Repair Company Langfang China

ISBN: (纸本)9789811921483

Well-M15 is an ultra-deep exploratory well deployed by cnpc in the Mingebulak project. Its geological conditions are complex, with the characteristics of high temperature, high pressure, high salt, high hydrogen sulfide, and ultra-deep——"four highs and one super". In the process of cementing, there are problems such as low displacement efficiency, easy mixing of cement slurry, complex formation pressure layers, and high requirements for casing accessories and special well-entry tools, which seriously affect the sealing effect and cementing quality. In view of the above difficulties, the cement slurry design of Well-M15 is based on the optimization of the mature system formula. Choose solid anti-salt fluid loss agent G33S for the second-spud, and choose matrix anti-invasion and anti-channeling agent BCG-200L for the third-spud, which has good salt resistance, temperature resistance and channeling resistance. At the same time, for the purpose of salt resistance, each level of casing cement slurry system is optimized to improve the specific cement slurry formula to meet the cementing needs. Large-size casing floating shoes and floating hoops focus on erosion resistance, while deep well cementing tools focus on high temperature and pressure resistance, which effectively guarantees cementing operations. The successful drilling of Well-M15 has set a series of new records for cnpc’s overseas projects, including the deepest casing of the same size, the largest injection volume, the longest one-time sealing section, the deepest application of graded cementing technology, and the highest density of cement slurry. At the same time, it has also created a new record of quality qualification rate and quality rate of deep well liner cementing in Uzbekistan, providing a reference for the cementing of deep wells and complex wells in similar blocks in the future. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Hydrogen sulfide

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design Method for Planner Coils under Magnetic Shielding Cylinder

Design Method for Planner Coils under Magnetic Shielding Cyl...

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Youth Academic Annual Conference of Chinese Association of Automation (YAC)

作者： Zhihong Wu Zhuo Wang Xia Xie Haoying Pang Wenfeng Fan Hongyu Pei School of Instrumentation and Optoelectronic Engineering Beihang University Beijing China CNPC Engineering Technology R & D Company Limited Beijing China

A novel strategy using the target field method (TFM) to design uniform and gradient magnetic field coils is proposed thereby addressing the coupling effect of magnetic field coils with high permeability materials. By combining the mirror method and Green’s function to solve the coupling effect between the magnetic field generated by the coil of the cylindrical structure and the externally enclosed high permeability material, the magnetic field generated on the inner surface of the magnetic shield and on the boundary of the magnetic field coil is finally calculated accurately. Compared with the design method that does not consider the magnetic field coupling effect, the field deviation is reduced from 3.3 × 10 −1 to 3.9 × 10 −2 (B x coil), and 9.0×10 −2 to 1.20×10 −2 (B z coil), the maximum |δ 2 | were reduced from 1.30 × 10 −1 to 4.0 × 10 −2 (dB x /dz coil), and 2.0 × 10 −2 to 1.5 × 10 −2 (dB z /dz coil). The proposed design strategy is validated by simulation analysis, and the research methodology of this strategy can be further applied to the development of core apparatus for magnetic field regulation and compensation of atomic sensors.

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Wide and deep Cross Network for the rate of Penetration Prediction

SSRN

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SSrN 2023年

作者： Pei, Zhijun Song, Xianzhi Ji, Yong Yin, Tianshi Tian, Shouceng Li, Gensheng Beijing102249 China State Key Laboratory of Petroleum Resources and Prospecting Beijing102249 China CNPC Engineering Technology R&D Company Limited Beijing102206 China

rate of penetration (rOP) prediction is of great significance for drilling optimization. However, the current intelligent rOP prediction models are mostly based on complete data-driven, and the mobility and stability of the model need to be improved. Based on the analysis of the modified Young's rOP equation, there are linear, nonlinear, and cross-multiplication relationships between rOP and multiple drilling parameters. Therefore, the deep neural network (dNN) model, known for its strong nonlinear fitting ability, is difficult to fully mine the hidden information of drilling data. Based on the wide and deep learning (WdL)model and deep and cross neural network (dCN) model, an innovative wide and deep cross neural network (WdCN) was proposed in this research to fit the complex correlation between multiple drilling parameters and rOP. Using the drilling data of two ultra-deep wells in Tarim Oilfield, the intelligent rOP prediction models of dNN, WdL, dCN, and WdCN were established, and four cases were established to evaluate the fitting ability and migration ability of the models. The results show that the mean relative error (MrE) of the WdCN rOP prediction model in adjacent wells is the lowest at 11.36%, and the maximum increase is 7% compared to the dNN model, showing a high fitting ability and migration ability. © 2023, The Authors. All rights reserved.

关键词： Neural network models

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Micro/nano structured oleophobic agent improving the wellbore stability of shale gas wells

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Petroleum Exploration and development 2022年第6期49卷 1452-1462页

作者： GENG Yuan SUN Jinsheng CHENG rongchao QU Yuanzhi ZHANG Zhilei WANG Jianhua WANG ren YAN Zhiyuan rEN Han WANG Jianlong CNPC Engineering Technology R&D Co.Ltd. Beijing 102206China School of Petroleum Engineering China University of Petroleum(East China)Qingdao 266580China

Through embedding modified nano-silica particles on the surface of polystyrene using the method of Pickering emulsion polymerization,a kind of nano/micro oleophobic agent named OL-1 was *** effects of OL-1 on the rock surface properties and its performance in inhibiting the oil phase imbibition into the rock were *** performance and mechanisms of OL-1 in improving the wellbore stability of shale gas wells were evaluated and ***-1 could absorb on the surface of the shale core to form a membrane with a micro-nano two-stage roughness,making the surface energy of the core decrease to 0.13 mN/m and the contact angle of the white oil on the core surface increase from 16.39°to 153.03°.Compared with the untreated capillary tube,when immersed into 3#white oil,the capillary tube treated by OL-1 had a reversal of capillary pressure from 273.76 Pa to-297.71 Pa,and the oil imbibition height inside the capillary tube decreased from 31 mm above the external liquid level to 33 mm below the external liquid *** amount of oil invading into the rock core modified by OL-1 decreased by 64.29%compared with the untreated *** shale core immersed into the oil-based drilling fluids with 1%OL-1 had a porosity reduction rate of only 4.5%.Compared with the core immersed in the drilling fluids without OL-1,the inherent force of the core treated by 1%OL-1 increased by 24.9%,demonstrating that OL-1 could effectively improve the rock mechanical stability by inhibiting oil phase imbibition.

关键词： shale wellbore stability oil-based drilling fluids oleophobic agent micro-nano composites wettability reversal

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