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design Method for Planner Coils under Magnetic Shielding Cylinder 38

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

引用

38th Youth Academic Annual Conference of Chinese Association of Automation, YAC 2023

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

ISBN: (纸本)9798350303636

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 (Bx coil), and 9.0×10-2 to 1.20×10-2 (Bz coil), the maximum |δ2| were reduced from 1.30 × 10-1 to 4.0 × 10-2 (dBx/dz coil), and 2.0 × 10-2 to 1.5 × 10-2 (dBz/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. © 2023 IEEE.

关键词： high permeability materials magnetic field coils mirror image method target field method

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Machine Learning-based Sweet Spot Prediction Method for Canada Tight Sandstone Gas reservoir

Machine Learning-based Sweet Spot Prediction Method for Cana...

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2024 SPE/AAPG/SEG Unconventional resources technology Conference, UrTC 2024

作者： Chen, Zan Fang, Yexin Yuan, Qian Su, Hao Yao, Yili Chen, Yu Sinopec Petroleum Exploration and Production Research Institute China CNPC Engineering Technology R&D Company Limited China Oil & Gas Technology Research Institute Changqing Oilfield Company Xi’an China

A prediction method for the EUr (Estimated Ultimate recovery) of tight sandstone gas reservoirs based on a composite machine learning approach was proposed and applied in the M tight sandstone reservoir in Canada. This method extrapolated geological parameters such as porosity and brittleness index using a Conditional Generative Adversarial Network (CGAN). By combining supervised and unsupervised machine learning methods, a prediction model linking geological-engineering parameters with single-well EUr was established. Based on this model, the fracturing parameters were optimized using the Bayesian optimization algorithm. Following above three steps, a comprehensive EUr distribution map for the entire operating area was created. By comparing it with the actual EUr, it was found that this method has a high prediction conformity rate, providing guidance for actual production. Copyright 2024, Unconventional resources technology Conference (UrTeC).

关键词： Machine learning

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New Understanding of Matrix-Fracture dual Media reservoir damage Based on Pressure-Controlled Fracturing 58

New Understanding of Matrix-Fracture Dual Media Reservoir Da...

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58th US rock Mechanics / Geomechanics Symposium 2024, ArMA 2024

作者： Zhang, Yang Qiao, Yan Zhang, Shiling Wu, Hongjun Bai, Jie Guo, Xudong Li, Senmu CNPC Engineering Technology R&D Company Limited BeiJing China Research Institute of Petroleum Exploration & Development BeiJing China PetroChina Tuha Oilfield Company HaMi China

ISBN: (纸本)9798331305086

The Tarim Oilfield Krasu tectonic zone is deeply burial, high temperature, low porosity and permeability, and constitutes the complex matrix-fracture dual media seepage channels. reservoir damage evaluation for such reservoirs is important for subsequent development. In this study, we firstly processed the fracture network in the reservoir core by controlled-pressure fracturing to improve the fracture tortuosity, and verified the reasonableness of this method by CT scanning and shape factor calculation. Then, based on the dual-media condition, we establish the water/oil-lock damage evaluation method, the stress-sensitive evaluation method, the fluid-sensitive evaluation method, and the in-well fluid damage evaluation method. Based on the above methods, the sensitivity of matrix-fracture dual-media reservoirs is moderately strong for water-oil locking, stress, and fluid salinity, moderately weak for liquid alkalinity, weakest for liquid flow rate. In-well fluid damage replacement experiments show that reservoir damage caused by first contact is the most important factor of reservoir damage during the whole process of drilling-completion-reconstruction. For deep tight reservoirs, fracturing fluid is easy to cause serious reservoir damage, and it is necessary to pay attention to reservoir protection during fracturing in low-yield blocks. Copyright 2024 ArMA, American rock Mechanics Association.

关键词： Fracturing fluids

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Water Shutoff and Conformance Improvement for Lamadian Oilfield in daqing Using a Novel Polymer System: Experimental Study, Simulation, and Pilot Tests

Water Shutoff and Conformance Improvement for Lamadian Oilfi...

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2023 Abu dhabi International Petroleum Exhibition and Conference, AdIP 2023

作者： Lu, Meng Singh, Harpreet Li, Jianshen Huang, Qiushi Ma, Chi Shan, Gaojun du, Qinglong Cai, Meng Wang, Haitao Liu, Xiangbin Qiao, Yan Chen, Huan Chen, Zhao Nie, Cong CNPC USA Corp HoustonTX United States CNPC Engineering Technology R&D Company Limited Beijing China PetroChina Daqing Oilfield Company Heilongjiang Daqing China

ISBN: (纸本)9781959025078

Primary recovery and extensive waterflooding lead to preferential pathway for the water between injectors and producers, resulting in low sweep efficiency and lower oil recovery. The Lamadian Oilfield in daqing has been waterflooded for 50 years, where various methods have been tried to reduce the high water-cut. This paper presents a novel water conformance control system that has been successfully applied to reduce water-cut and increase the oil production from Lamadian Oilfield. The polymer system containing swelling particles and delayed polymer gelling agents to form plugs and block high permeability channels was tested in the laboratory through sandpack and coreflood experiments at reservoir temperature using injection brine from the Lamadian Oilfield. With injection concentration of polymer ranging between 1200-4500 ppm and crosslinker between 1200-1600 ppm, the experimental tests showed formation of strong plugs in-situ with delayed time of 4-18 days. This system also had low polymer/crosslinker's retention. The lab-measured parameters for rock-fluid interaction were used as input in a history-matched numerical reservoir simulator. Several scenarios with different injection schemes were simulated to investigate the volume of plugs formed, maximum distance travelled by the gelling agents from the injectors before forming plug, and their impact on the surrounding production wells. Simulation results showed that the formation of the plug was the most robust at the front of the crosslinker-polymer system, and the region between the injectors and the front showed formation of secondary plugs by the particles. An optimal scenario was selected for pilot tests. Field tests for 2 well groups with a total of 16 wells started in december 2021 that were successfully completed by April 2022. Field test results show the targeted high-perm channels were blocked, resulting in a significant increase in oil production (up to 15%) in the majority (71%) of the surrounding produ

关键词： Control systems

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design and Analysis of the Coaxial Magnetic Gears with Halbach PM arrays for downhole Electric drilling Tools 26

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

引用

26th International Conference on Electrical Machines and Systems, ICEMS 2023

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

ISBN: (纸本)9798350317589

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. © 2023 IEEE.

关键词： Torque

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Solving Method for Three-dimensional Circular Arc Well-Path Planning Model 11th

Solving Method for Three-Dimensional Circular Arc Well-Path ...

引用

11th International Field Exploration and development Conference, IFEdC 2021

作者： Tang, Xue-ping Hong, di-feng Su, Yi-nao Gao, Wen-kai Teng, Xin-miao CNPC Engineering Technology R&D Company Limited Beijing China

ISBN: (纸本)9789811921483

In order to solve the three-dimensional circular arc well-path planning model simply, effectively and accurately, two typical models of three-section and five-section well-path and their parameter combinations are discussed. Based on the analytical formula of the three-section model, the algorithms for solving various combinations are given. By analyzing the five-section model, a nonlinear constraint equation with 7 design parameters is obtained, which proves that only some combinations have analytical solutions, and then suitable solution methods are selected for different combinations. In order to solve the problem of nonlinear constraint equations, it is proposed that an accurate solution method for three-dimensional well-path planning model combined with analytical and piecewise iterative method, and the algorithm flows of typical parameter combinations are proposed, which satisfies the problem of solving three-dimensional well-path planning model. Using the model and the solving method in this article, the three-dimensional well-path design software is developed, which has been applied in the Venezuelan MPE-3 block development program and the extened-reach cluster horizontal well plans of the 8th platform in Zhuanghai block of dagang field in China. It can satisfy the requirements of the three-dimensional well-path planning for various types. It is proven that the solving method in this paper is simple, effective, fast, accurate, easy to program, and has application value in the design of directional wells and horizontal wells. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Three dimensional computer graphics

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Characteristics of conicl diamond tooth for breaking hard rock under vibratory percussion 57

Characteristics of conicl diamond tooth for breaking hard ro...

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57th US rock Mechanics/Geomechanics Symposium

作者： Ji, ran Shi, Huaizhong Sun, Zhaowei Chen, Han Xiong, Chao Song, Hengyu China University of Petroleum - Beijing Beijing China CNPC Engineering Technology R&D Company Limited Beijing China

ISBN: (纸本)9780979497582

The application of conicl PdC teeth to vibratory percussion drilling technology is expected to break deep hard rock efficiently and improve drilling efficiency. In this paper, the characteristics of conicl diamond tooth cutting and hard rock under percussion are investigated. Firstly, experiments on percussion compression of conicl diamond tooth into the broken rock were carried out to analyse the percussion energy and the characteristics of rock crushing pits. Secondly, a numerical model of the cutting process of conicl diamond tooth under the vibratory percussion was established. Three stages of rock-breaking by conical tooth cutting under high frequency number percussion are analyzed. Stress peaks with percussion of 6 times increased by 36.8% and 25.5% compared with percussion of 0 times and percussion of 3 times. There is the highest point of rock-breaking efficiency between percussion of 3 times and 4 times. Cutting force with percussion amplitude of 1.5mm increased by 42.7% compared with percussion amplitude of 0mm. The rock-breaking specific energy with percussion amplitude of 1.5 mm increased by 32.4% compared with percussion amplitude of 0 mm. This study provides a theoretical basis for the use of conical tooth in PdC drill bits under percussion. © 2023 57th US rock Mechanics/Geomechanics Symposium. All rights reserved.

关键词： rocks

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FdEM modeling on the fracture propagation behavior of hot dry rock subjected to cyclic soft fracturing 57

FDEM modeling on the fracture propagation behavior of hot dr...

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57th US rock Mechanics/Geomechanics Symposium

作者： Wu, Xiaoguang Yang, rui Li, Gensheng Huang, Pengpeng Huang, Zhongwei Liang, rui Long, Tengda State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum-Beijing China CNPC Engineering Technology R&D Company Limited China Downhole Service Company CNPC Chuanqing Drilling Engineering Company Limited China

ISBN: (纸本)9780979497582

Conventional hydraulic fracturing (HF) is an important way to develop Enhanced Geothermal Systems (EGS), but there are some problems such as high injection pressure and having trouble to create complex fracture network. To deal with those difficulties, Cyclic soft fracturing (CSF), an emerging technology, has been proposed, which adopts circulating stress waves to break down rock and forms a volumetric fracture network achieving oil and gas stimulation. In this paper, a numerical model of FdEM and a fully coupled thermal-fluid-solid solver are used to perform CSF experiments on hot dry rock (Hdr) in field scale. The influences of stress disturbance, fracture initiation and propagation and three key parameters on fracture morphology are analyzed. The research results show that CSF can indeed generate complex fracture network under parameter optimization of peak pressure and loading frequency. Compared with conventional HF, CSF forms a larger stress disturbance area and has bigger tensile stress at fracture tip, which may contribute to fracture propagation. Under large stress difference condition, with the increase of peak pressure, the fracture complexity increases first and then decreases. The results are expected to provide an insight into the stimulation mechanisms of CSF method in Hdr geothermal. © 2023 57th US rock Mechanics/Geomechanics Symposium. All rights reserved.

关键词： rocks

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development of a Wellbore Stability Prediction Model Using Multiple regression with Missing Core Samples: A Case Study of the Shunbei Oil and Gas Field 57

Development of a Wellbore Stability Prediction Model Using M...

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57th US rock Mechanics/Geomechanics Symposium

作者： Chang, Qifan Fu, Yun Zhou, Yitian Zheng, Lihui Li, Jie Jin, Yi China University of Petroleum Beijing Beijing China CNPC Engineering Technology R&D Company Limited Beijing China

ISBN: (纸本)9780979497582

The Shunbei oil and gas field, characterized by its intricate deep fault-karst reservoirs and fractured carbonate lithology, presents formidable challenges to wellbore stability during drilling and completion phases, precipitating adverse events such as wellbore collapse and fluid loss. This study embarks on addressing the paucity of data integral for effective wellbore stability prediction in this region, employing a tripartite methodological approach: identification of pertinent data and influential factors, enhancement of multiple regression accuracy, and selection of controlling factors. The study revealed that the multiple linear regression model delivered the most precise predictions for both the leakage rate and well diameter expansion rate. Crucial factors such as geodetic coordinates, drilling pressure, and azimuth were identified as exerting substantial influence on wellbore stability. By scrutinizing primary controlling factors and underscoring the crucial role of drilling pressure and displacement in averting collapse and leakage, this study provides invaluable insights applicable to actual production settings. This study, while enhancing understanding of wellbore stability through analyzing key factors, does not delve into quantitative control strategies. Nevertheless, it provides a practical framework for better management of wellbore collapse and leakage in Shunbei oil and gas field. © 2023 57th US rock Mechanics/Geomechanics Symposium. All rights reserved.

关键词： Lithology

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Two-Stage Active-Flux Observer for Position Sensorless Control of PMSM drives with Output Filter 26

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

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26th International Conference on Electrical Machines and Systems, ICEMS 2023

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

ISBN: (纸本)9798350317589

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. © 2023 IEEE.

关键词： Sensorless control

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