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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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detecting Harmful Vibrations in the drilling Industry Through Time Series Classification

Detecting Harmful Vibrations in the Drilling Industry Throug...

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Intelligent data and Security (IdS), IEEE International Conference on

作者： Fei Zhao Hao Wang Mian Chen Bo Gao College of Petroleum Engineering China University of Petroleum Beijing China CNPC Engineering Technology R&D Company Limited Beijing China China Petroleum Technology and Development Corporation Beijing China

ISBN: (数字)9798350389487

ISBN: (纸本)9798350389494

Petroleum and natural gas are pivotal in the energy sector, with drilling as the primary extraction method involving machine-driven drill bits for excavating underground and retrieving resources. Similar to various industrial processes, drilling efficiency is significantly affected by vibration-related issues, influencing petroleum extraction outcomes. To systematically identify vibrations during drilling, we developed a data collection system covering both surface and downhole components. The surface component primarily records parameters observed during drilling, while the downhole part integrates into the drilling tool, positioned near the drill bit to capture three-axis vibration signals. The amalgamation of data from both surface and downhole components facilitates the annotation of harmful vibrations. Using LSTM-FCN, we enhance vibration identification by processing surface and downhole data. Our SampleFusion (SF) algorithm further improves recognition by combining LSTM for surface and FCN for downhole data. This integrated approach enhances real-time monitoring and classification of drilling vibrations, contributing to industry efficiency and safety.

关键词： drilling Vibrations Time series analysis real-time systems Classification algorithms Safety Security

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design and Analysis of the Coaxial Magnetic Gears with Halbach PM arrays for downhole Electric drilling Tools

Design and Analysis of the Coaxial Magnetic Gears with Halba...

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International Conference on Electrical Machines and Systems (ICEMS)

作者： Aiguo Wang Xiaolong Zhao Longhui Liu Jin Cheng Han Qiao Hongwei Wang Jin Wang CNPC Engineering Technology R&D Company Limited Beijing China School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

This paper presents the design and analysis of a magnetic gear reducer with Halbach permanent magnet (PM) arrays developed for downhole electric drilling tools. 2d finite element simulation technology is used to investigate the performance benefits which can be obtained by the coaxial magnetic gears from applying the Halbach PM arrays. It is discovered that using the Halbach PM arrays can improve the radial magnetic field distribution of the air gap of the magnetic gears, increase the air gap flux density harmonics which is used to transfer torque and decrease air gap flux density harmonics undesired. After applying Halbach PM arrays, the output torque density increases by about 37.5%, the total losses of the magnetic gears are reduced by 34.2%, and the cogging torque is reduced by 45%, compared to the traditional design with radial magnetized PMs.

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Anomalous Behavior detection for Cloud Infrastructures via Transformer-represented Prior Knowledge

Anomalous Behavior Detection for Cloud Infrastructures via T...

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IEEE International Conference on Smart Cloud (SmartCloud)

作者： Fei Zhao Mian Chen Bo Gao Yi Cui reyu Gao Yan ding College of Petroleum Engineering China University of Petroleum Beijing China CNPC Engineering Technology R&D Company Limited Beijing China

With the rapid progression and increasing industrial relevance of cloud computing, the stability of cloud systems has become increasingly critical as they are handling a vast number of requests. To ensure this stability, the operational status of cloud servers, indicated by key performance indicators such as CPU load, network bandwidth, memory allocation, and disk 1/0 operations, must be continuously monitored. Any changes in these metrics could signify potential system malfunctions like network intrusion or hardware faults due to user activities. However, given the cyclical nature of the utilization metrics, which often exhibit, minute, hour, or daily patterns, merely setting thresholds may not effectively detect these anomalous behaviors. To address this, our research capitalizes on the advantages of the Transformer model, incorporating cyclical prior knowledge to extract these periodic patterns from the metrics, thereby enhancing the detection efficacy. Experimental results show that our proposed approach outperforms the Transformer model, improving the anomalous detection accuracy by 1.7 %, with the comprehensive evaluation metric (Fl score) surpassing 0.88.

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Two-Stage Active-Flux Observer for Position Sensorless Control of PMSM drives with Output Filter

Two-Stage Active-Flux Observer for Position Sensorless Contr...

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International Conference on Electrical Machines and Systems (ICEMS)

作者： Aiguo Wang dongdong Chen Lingyu Tao Fei Han Zhijian Hu Hongwei Wang Han Qiao Jin Wang CNPC Engineering Technology R&D Company Limited Beijing China School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

This paper presents a two-stage active-flux observer for sensorless control of permanent magnet synchronous machines (PMSMs) in a case where the inverter output is filtered by a LC filter. First, a full-order active-flux observer is presented taking the LC filter into consideration. Stator voltages, stator currents and the active flux can be observed without additional measurements except the inverter output currents. Then, the feedback matrix of the observer is designed according to the stabilization algorithm, guaranteeing sufficient stability margin and a good performance in a wide-speed range. Based on the full-order observer, a two-stage observer is proposed to reduce the computation burden. Furthermore, an adaptive law is derived for rotor speed estimation. Finally, the effectiveness of the proposed observer is verified by comprehensive simulation and experiments.

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Experimental and Numerical Study on Transient Heat and Mass Transfer of Cryogenic Fluid in Wellbore during Cryogenic Fracturing 55

Experimental and Numerical Study on Transient Heat and Mass ...

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

作者： Zhang, Hongyuan Zou, Lingzhan Zhuo, Lubin Bi, Wenxin Li, Bing Yu, Jing Huang, Zhongwei CNPC Engineering Technology R&D Company Limited Beijing China China University of Petroleum Beijing China

ISBN: (纸本)9781713839125

Cryogenic nitrogen is a promising hydraulic fracturing fluid with high cracking efficiency for tight formation reservoir. Predicting the temperature field in wellbore accurately is of great importance for the feasibility evaluation and parameters design of cryogenic fracturing. A laboratory experiment is conducted to investigate the heat transfer intensity of liquid nitrogen (LN2) in a circular tube under conditions similar to fracturing. A prediction model of heat transfer coefficient for LN2 is derived. A transient numerical model is developed to simulate the fluid flow and thermal behaviors of liquid nitrogen in the tubing. The transient heat and mass transfer characteristics of liquid nitrogen in tubing during cryogenic fracturing is simulated. The downhole fluid temperature is calculated and the temperature distributions in the fracturing string and annulus are obtained as a function of time. The typical temperature curve for downhole fluid is presented as well. The results showed that the co-injection fracturing pattern adopted in filed for cryogenic fracturing has inherent shortcomings. It can’t transport LN2 effectively to well bottom. High pressure in annulus improves the heat transfer between annulus fluid and fracturing string, which result in a dramatic decrease on the casing temperature, and would induce a low temperature damage to cement sheath. © 2021 ArMA, American rock Mechanics Association.

关键词： Flow of fluids

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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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Study on the loss control performance of smart adhesive lost circulation materials with ethylene vinyl acetate copolymer (EVA) 2

Study on the loss control performance of smart adhesive lost...

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2nd International Conference on Advanced Materials and Intelligent Manufacturing, ICAMIM 2021

作者： Lei, Shaofei Bai, Yingrui Sun, Jinsheng Lv, Kaihe Zhang, Shupei Qiu, Jiaxian Shandong Qingdao266580 China CNPC Engineering Technology R&D Company Limited Beijing102206 China

The conventional lost circulation materials (LCMs) particles of seal in the formation are in linear contact. Therefore, there is no cohesive force interaction, which is susceptible to pressure fluctuations, resulting in lost circulation and control failure. In response to these problems, this paper tested the high-temperature adhesion properties of EVA in the viscous flow transition zone through high-temperature adhesion experiments;then a smart adhesive LCMs is prepared using thermoplastic EVA resin with conventional LCMs;finally, through the high-temperature and high-pressure plugging experiment, the system's performance for sealing fractures was tested. The experiment results show that the smart adhesive LCMs have good plugging performance and can bond LCMs in the fracture to form a high-strength sealing with a pressure-bearing capacity of up to 9.3MPa. © 2021 Institute of Physics Publishing. All rights reserved.

关键词： Adhesives

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A new method for predicting the density of drilling fluid based on non-parametric regression under HTHP

A new method for predicting the density of drilling fluid ba...

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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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Lithology-controlled stress variations of Longmaxi shale–Example of an appraisal wellbore in the Changning area

Rock Mechanics Bulletin

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rock Mechanics Bulletin 2022年第1期1卷 53-68页

作者： Xiaodong Ma Shihuai Zhang Xiaowen Zhang Jiandong Liu Juan Jin Wei Cheng Weidong Jiang Guangming Zhang Zhaowei Chen Mark d.Zoback ETH Zürich Department of Earth SciencesSwitzerland Research Institute of Petroleum Exploration&Development PetroChinaChina Key Laboratory of Oil&Gas Production CNPCChina CNPC Engineering Technology R&D Company Limited China Stanford University Department of GeophysicsUnited States

The Longmaxi shale is an extensive,prolific unconventional play in southwestern *** development in the Changning area is affected by ineffective hydraulic fracturing(HF)stimulation,fault reactivation and casing *** is suspected that the stress contrast within and between the shale reservoirs and the formations above and below matters to hydraulic fracture propagation and reservoir *** this end,the Longmaxi shale in the Changning area deserves a dedicated quantification of the in situ stress state and its *** this study,we re-visit the available data from one of the play’s first appraisal wellbores(X01)for an integrated geomechanics study,focusing on profiling the stress across the Longmaxi and its adjacent *** geophysical logs and other stress indicators,we re-interpret its stress profile in the context of lithological *** resulting stress variations are modeled primarily through a viscoplastic stress relaxation framework,compared with the results via the frictional equilibrium and an elastic theory(the Extended Eaton model).We offer some discussions on the differences and similarities of these stress profiling methods,and examine their applicability to Longmaxi shale in the Changning *** objective is to connect the lithology-controlled stress variations to the first-order complexities(HF ineffectiveness and fault reactivation)that have been observed in the area to date.

关键词： China shale formations

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