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2024 8th International Conference on Electrical, Mechanical and Computer engineering (ICEMCE)

作者： Haiqiu Zhou Yuguang Ye Weiheng Cheng Yixin Gu Qijun Guo Tuo Zhou Bahedaer Yue Xiao Fuhua Jiang Shiying Zhou CNPC Engineering Technology R & D Company Limited Beijing China China National Oil and Gas Exploration and Development Co. Ltd. Beijing China

ISBN: (数字)9798331506230

ISBN: (纸本)9798331506247

Temperature and pressure are important factors affecting the density of drilling fluid. As exploration and development gradually progress to deep layers and deep waters, formation temperature and pressure are getting higher and higher. Ignoring the influence of temperature and pressure on the density of drilling fluid will lead to large deviations in drilling hydraulic calculations and increase the probability of accidents such as lost circulation and overflow. In this paper, the density change of a set of field oil-based drilling fluids is measured through laboratory experiments. The temperature range is 20-180°C, and the pressure range is 0.1 MPa-180 MPa. A high-temperature and high-pressure density prediction model for oil-based drilling fluids is established based on the weighted linear regression method. Based on the established model, the high-temperature and high-pressure density of the experimental drilling fluid is predicted. The results show that the prediction error is less than 5%, and the calculation accuracy is high, which can guide on-site operation and construction.

关键词： drilling Temperature measurement Temperature distribution Fluids Accuracy density measurement Oils Computational modeling Linear regression Predictive models

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Triple-Cladding Ytterbium doped Fiber for 12 kW Single Module

Triple-Cladding Ytterbium Doped Fiber for 12 kW Single Modul...

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2023 Asia Communications and Photonics Conference/2023 International Photonics and Optoelectronics Meetings, ACP/POEM 2023

作者： Meng, Yue Xu, Zuying Shi, Xudong Li, Yu Liu, Tianying Li, Can Yan, Xiao Zheng, Wei Wang, Heng Yu, Jiangang Zhao, Zhiyong Tang, Ming Yangtze Optical Fibre and Cable Joint Stock Limited Company Optical Fiber R&d Center Everfoton Technologies Corp Oration Limited State Key Laboratory of Optic Al Fiber and Cable Manufactu Re Technology Wuhan30070 4 China Everfoton Technologies Corp Oration Limited Optical Fiber R&d Center Wuhan China & National Engineering Laboratory for Next Generation Internet Access System Wuhan China

ISBN: (纸本)9798350312614

High power continuous-wave ytterbium-doped fiber lasers have unique advantages such as high electro-optical efficiency, excellent beam quality and good thermal management, and are widely used in industrial materials processing and scientific research. However, multi-kW (\geqslant 10kW) high-power fiber lasers has encountered numerous technology challenges in double-cladding fibers. In this work, we designed and fabricated a triple-cladding ytterbium doped fiber with large core diameter by using Modified Chemical Vapor deposition (MCVd) combined with all-gas-phase doping method. An excellent laser performance could be demonstrated for such a fiber with an output power of more than 10 kW and a slope efficiency of 82%, no Transverse Mode instability (TMI) is observed. Long-term laser stability at 12 kW-level was carried out in a master oscillator power amplifier (MOPA) laser system for 500 hours with power degradation less than 1%, meanwhile a stimulated raman scattering (SrS) suppression ratio that is larger than 45dB was obtained. © 2023 IEEE.

关键词： fiber laser high-power long-term reliability photo-darkening triple cladding

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development and Performance Evaluation of a New Type of Temperature resistant Surfactant for Ultra-deep Well Casing Flushing

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SSrN 2024年

作者： Song, Hanxuan Guo, Jixiang Kiyingi, Wyclif Wang, Xiwen He, Aiguo Li, Jiao Guo, Jixiang Chen, Xiangwei Wang, Li State Key Laboratory of Petroleum Resource and Prospecting China University of Petroleum Beijing China Unconventional Petroleum Research Institute China University of Petroleum Beijing102249 China CNPC Engineering Technology R&D Company Limited

during the ultra-deep well drilling process, drilling fluid tends to remain in the casing, contaminating it and affecting the progress of completion engineering. To address this issue, a screening method was employed to select non-ionic surfactants, with fatty alcohol polyoxyethylene ether (AEO-7) being chosen among various types. To overcome the temperature resistance issue of AEO-7, Phthalic anhydride (PA) was introduced into AEO-7, and neutralization reaction with NaHCO3 was carried out to synthesize a novel surfactant (SEO). High-temperature and high-pressure precipitation testing equipment and high-temperature cleaning equipment were set up to study the temperature-resistant cleaning performance of SEO. results indicate that surfactant SEO maintains good solubility in high-temperature environments in the solution through ionic bonding. At 200°C, the cleaning efficiency of SEO solution for different types of drilling fluid residues exceeds 95%. Additionally, SEO adsorption on metal surfaces can inhibit Cl- corrosion. Combined with micro-mechanism characterization results, SEO can disperse solid particles, adsorb organic phases, reduce interfacial tension, and achieve efficient cleaning. Field experimental results show that the surface tension retention rate of well-flushing fluid after cleaning is 95.8%, with a solid particle content of 5.4g/L, meeting onsite requirements and broad application prospects. © 2024, The Authors. All rights reserved.

关键词： Surface active agents

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A comprehensive case study on lost circulation of Changqing Mizhi Block in perspective of geomechanics 56

A comprehensive case study on lost circulation of Changqing ...

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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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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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Experimental Investigation on Fracture Growth for Integrated Hydraulic Fracturing in Multiple Gas Bearing Formations

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SSrN 2022年

作者： Tan, Peng Jin, Yan Fu, Shihao Chen, Zhaowei CNPC Engineering Technology R&D Company Limited Beijing102206 China China University of Petroleum Beijing102249 China

Whether hydraulic fracture could connect different gas-bearing zones was the key to jointly extract the multiple natural gases of coalbed methane, shale and other tight gases by integrated hydraulic fracturing in coal measure strata (CMS). In this paper, a several groups of combination samples comprised of artificial rocks were prepared, and true triaxial hydraulic fracturing experiments were conducted to stimulate the hydraulic fracture propagation and penetration behavior. The effects of in-situ stress, injection rate, natural fracture and well type on fracture growth were studied. The main results were as follows: (1) Fracture geometries in CMS presented strong asymmetric, nonplanar extension and unilateral expansion features in the vertical plane. (2) With higher value of vertical stress difference coefficient and injection rate, fracture vertical extension was larger and the possibility of fracture connecting adjacent gas bearing layer was bigger. (3) There was huge difference in fracture extension behavior between vertical and horizontal well. In vertical well, the main fracture presented "+" shape and fully communicated natural coal cleats system. In horizontal well, fracture height growth was not enough and fracture patterns vertically presented "H" or "T" shape, since the hydraulic fracture was easy to turn direction when propagating to natural weak planes. In addition, the fracture vertical extension ability increased with vertical stress difference coefficient rising. (4) Natural fractures could induce fracture turning and branching, which improved fracture network complexity and caused fracturing fluid loss and hydraulic energy dissipation. Thus, choosing shale or coal layer with developed natural fractures as fracturing layer was unhelpful for integrated fracturing operation. Besides, fracturing operation efficiency could be enhanced by higher fracturing fluid viscosity, injection rate and gradient sanding. These results could provide theoretical guidan

关键词： Hydraulic fracturing

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Green Preparation of Force-Sensitive Micro-Capsules and Their Application in Self-Healing of Cement Sheath

SSRN

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SSrN 2024年

作者： Zhang, Chi Xia, Xiujian Zhai, Xianzhi Ying, Yujie Hu, Miaomiao Guo, Jintang School of Chemical Engineering and Technology Tianjin University Tianjin300350 China CNPC Engineering Technology R&D Company Limited Beijing102206 China Zhejiang312300 China Haihe Laboratory of Sustainable Chemical Transformations Tianjin300051 China Beijing University of Chemical Technology China

Micro-capsule has been considered the most promising self-healing material, while the complex and high temperature polymerization process, and environmental unfriendly raw materials limits its wide application. Herein, the green micro-capsule composed of epoxy resin and calcium alginate were prepared at room temperature via needle drop method,O/W/O emulsion method and spraying method. The effects of preparation methods on the water absorption, encapsulation rate of micro-capsules were revealed, and the differences in the self-healing efficiency of cement containing these green micro-capsules were also studied. Among all samples, the micro-capsules prepared by O/W/O emulsion method (MCE-2) owned the highest water absorption 60.13% and the highest epoxy resin content 48.1%. Compared with the blank samples, adding micro-capsules improved the liquidity of cement slurry and facilitated the hydration process, related to the release of extra water. While, the micro-capsules caused additional defects in the cement matrix and weakened the compressive strength of cement. In the self-healing measurement, the composites with MCE-2 showed the biggest mass transfer pressure and least permeability before and after repair. The higher water absorption of MCE-2 significantly increased greater mass transfer resistance to block the erosion of external fluids before repair, and the higher epoxy resin content could ensure stronger sealing effect after repair, achieving the best self-healing performance. © 2024, The Authors. All rights reserved.

关键词： Water absorption

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The Effect of trajectory optimization on wellbore stability of bedding shale of Longmaxi Formation in Changning, Sichuan, China 56

The Effect of trajectory optimization on wellbore stability ...

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56th U.S. rock Mechanics/Geomechanics Symposium

作者： Chao, F. Qian, W. Hongwei, J. Zhaowei, C. Ying, W. Xiao, F. Wenbao, Z. Shaoyun, C. National Engineering Research Center for Oil&Gas Drilling and Completion Technology Beijing China Drilling Technology Department CNPC Engineering Technology R&D Co. Ltd Beijing China Drilling Engineering Technology Research Institute of Daqing Drilling and Exploration Engineering Company Heilongjiang Daqing China

ISBN: (纸本)9780979497575

The development of weak plane of Longmaxi formations brings great challenges to the safe drilling of horizontal wells. Since 2018, hundreds of sticking problems caused by wellbore instability occur every year. It is seriously restrict the efficient development of shale gas. In order to clarify the mechanism of wellbore instability and take methods to solve the problems, the wellbore stability model was studied in well NingA. Based on lithology division, rock mechanical parameter profiles of different lithology are established, and formation pore pressure and original in-situ stress are restored. Consider the role of intermediate principal stress, the wellbore stability analysis models of weak plane failure criteria and Modified Lade criterion are established. According to the model, the drilling fluid column pressure (collapse pressure) to maintain the wellbore stability is calculated. Properly increasing the density of drilling fluid above the collapse pressure is an effective solution to wellbore stability, but there may be a certain risk of leakage. By properly optimizing the well trajectory in the collapse section, it can maintain the wellbore stability and avoid leakage due to excessive drilling fluid density. Therefore, it is recommended to adjust the mud weight as required based on the trajectory of the planned well which can greatly improve the wellbore safety. © 2022 ArMA, American rock Mechanics Association.

关键词： Horizontal wells

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research and Application of Micro-Expansion and Anti-Channeling Cement Slurry System in Agadem Oilfield

Research and Application of Micro-Expansion and Anti-Channel...

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2021 Abu dhabi International Petroleum Exhibition and Conference, AdIP 2021

作者： Wang, Gang duan, dexiang Li, Wanjun Qian, Feng Qin, Zhengli Zhong, Zhao Zhou, Chuan Bahedaer, Baletabieke Jing, Ning Ye, dongqing Gao, Qingyun Xiao, Yue Li, Ganlu Liu, Jitong Zhang, Guobin Li, Shaohua CNPC Engineering Technology R and D Company Limited China National Oil and Gas Exploration and Development Company Ltd China College of Petroleum Engineering China University of Petroleum Beijing China CNPC Greatwall Drilling Company

ISBN: (纸本)9781613998342

The overall liner cementing qualification rate is only 40% in Agadem block of Niger, The cement slurry system used in the field has a UCA transition time of 43min, and an expansion rate of -0.03% in 24h, which result in a poor anti-gas channeling performance. The expansive agent and the anti-gas channeling toughening agent of anti-channeling agent were optimized through experiment study. A novel micro-expansion anti-gas channel cement slurry system which is suitable for Agadem block was obtained through experiment optimization study: 100% G +2 ∼ 4% fluid loss agent +3 ∼ 4.5% anti-channeling agent +1 ∼ 2% expansion agent-100S +0.15 ∼ 0.4% retarder +0 ∼ 0.3% dispersant +0 ∼ 0.25% defoamer + water. This new cement system has a good anti-gas channeling performance, the cement strength is 24.5-35.0MPa after 24hrs, the UCA transition time is 16-18min, and the expansion rate is 1.5-1.7%. At the same time, a cementing prepad fluid suitable for the block and the micro-expansion cement slurry system is selected to ensure the performance of the cement slurry's anti-channeling performance. The field test results proofs the good performance of the new cement system. The cementing qualification rate of Koulele W-5 well is 96%, and the second interface cementation is Good. The cementing qualification rate of Trakes CN-1 well is 100% which second interface cementation is Excellent. This paper has positive guidance and reference for cementing in Agadem block. © Copyright 2021, Society of Petroleum Engineers

关键词： Expansion

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Co-training Semi-supervised Learning Algorithm for Classification of Seismic Facies of Carbonate Tidal Channels 11th

Co-training Semi-supervised Learning Algorithm for Classific...

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11th International Field Exploration and development Conference, IFEdC 2021

作者： Wang, ru-yi Wang, Zhi-zhang Yang, Xiang-Tong Xu, Zhen-yong Guo, Fa-jun Downhole Operation Research Department CNPC Engineering Technology R&D Company Limited Beijing China College of Geosciences China University of Petroleum-Beijing Beijing China Research Institute of Petroleum Exploration and Development Beijing China Research Institute of Exploration and Development PetroChina Hua Bei Oilfield Company Shangqiu China

ISBN: (纸本)9789811921483

This primary goal of this study was to improve the accuracy of seismic identification of carbonate tidal channels and to achieve quantitative characterization of seismic facies. This paper is the first to present a co-training semi-supervised learning algorithm for use with seismic and drilling data to identify the sedimentary microfacies patterns of tidal channels within carbonate reservoirs. Co-training is a semi-supervised machine learning algorithm by which the feature dataset is split into two subsets, and a classifier is established for each feature subset. Each subset is re-trained based on the classification results of the other subset until the same classification results are obtained for most of the data in the two subsets. Taking the Mb1-3 subzone of the Mishrif Formation, West Qurna Oilfield-1 (Iraq) as an example, we employed zero-crossing-wrapping method to extract 18 seismic attributes of the target zone. The sliding window method was used to optimize 12 seismic attributes, and a hierarchical clustering algorithm based on correlation coefficients was used to group these seismic attributes. Using the two seismic attribute groups as feature data, we employed logistic regression, decision tree, and the k-nearest neighbor classifiers to conduct co-training semi-supervised learning for the classification and identification of tidal channels and lagoons. The results showed that the co-training semi-supervised learning algorithm improved the accuracy rate of each classifier, reduced background noise and clutter signals, and enhanced the continuity of the plane distribution of the tidal channel prediction results. In summary, the co-training semi-supervised learning algorithm significantly improved the efficiency of seismic facies identification of tidal channels. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Learning algorithms

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