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57th US rock Mechanics/Geomechanics Symposium

作者： Sun, Yuqi Liu, Li Jiang, Haichao Yu, Jinping Ji, Guodong Wu, Qiang Chen, Changchang CNPC Engineering Technology R&D Company Limited Beijing102206 China International Engineering Company BHDC Tianjin300450 China

ISBN: (纸本)9780979497582

Non-planar PdC cutters are widely used to solve these problems of wear and breakage of conventional PdC cutters when drilling hard rock formations. In this paper, the finite element method is adopted to study the rock-breaking characteristics of non-planar PdC cutters. The effects of the cutting parameters on the rock-breaking efficiency of a non-planar PdC cutter are analyzed. The mechanical specific energy (MSE) of non-planar PdC cutters is smaller. The rate of penetration (rOP) is higher, and the aggressiveness is stronger. The influence of different cutting parameters on the rock-breaking efficiency of four types of PdC cutters is analyzed. The results indicate that the optimum cutting depth is in the range of 1.5-2 mm, and the optimum cutting angle is in the range of 15°-20°. Based on the finite element simulation results, a personalized PdC bit is designed and successfully applied to Yang101HXX-3 well. The research results can provide a theoretical basis for the selection, structure optimization, drilling bit design, and application of efficient PdC bits. © 2023 57th US rock Mechanics/Geomechanics Symposium. All rights reserved.

关键词： Finite element method

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design of Automatic Feeding device for 15,000 Meter Class Liquid drilling Fluid Additives 13th

Design of Automatic Feeding Device for 15,000 Meter Class Li...

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13th International Field Exploration and development Conference, IFEdC 2023

作者： Xiao, Jian-Qiu Yang, Hui Shao, Qiang Hu, Zhi-Jian Han, Fei Li, Xing-Yue CNPC Engineering Technology R&D Company Limited Beijing China CNPC Oilfield Technology Service Co. Ltd. Beijing China

ISBN: (纸本)9789819702558

In order to improve automation, efficiency, and HSE level during drilling fluid preparation and maintenance of ultra-deep and extra-deep wells, an automatic feeding device for 15000 m class liquid drilling fluid additives was developed. The automatic feeding device of liquid drilling fluid additives is composed of liquid storage tanks, liquid conveying pumps, pipeline control valves and auxiliary devices. The liquid drilling fluid additives can be quickly transported to the liquid storage tanks by the suction pumps for temporary storage. When the drilling fluid is prepared or maintained, the drilling fluid additives can be quickly transported to the mud mixing system by the liquid metering pumps. It enables accurate, automatic, high-speed dosing of liquid additives into the mud mixing system for increased job flexibility and ease of use. The operator controls and monitors operations using human-computer interaction interface mounted on the control cabinet’s touchscreen. Operation parameters are set using the human-computer interaction interface. An information area on the touchscreen displays real-time system status whenever the system is running. The development of the device will create basic conditions for the automatic and intelligent of drilling fluid preparation and maintenance, and improve and the level of on-site HSE. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Tanks (containers)

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Feasibility Evaluation of rF Heating Heavy Oil reservoir Based on the Interaction Between rocks and Electromagnetic Waves 58

Feasibility Evaluation of RF Heating Heavy Oil Reservoir Bas...

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

作者： Wang, Zhengxu Guo, Qingfeng Cai, Xiao Zhang, Jingtian Zhao, Qing Li, Bo Chen, Xuefeng Gao, Haiyang CNPC Engineering Technology R&D Company Limited Beijing China PetroChina Tarim Oilfield Company Xinjiang Korla China

ISBN: (纸本)9798331305086

Currently, radio frequency (rF) heating is emerging as an alternative to steam thermal recovery methods, owing to its numerous advantages including cleanliness, environmental friendliness, and cost-effectiveness. Achieving maximum heating distance and temperature during rF heating hinges on understanding the interaction between rF electromagnetic waves and rocks. To address this, the present study elucidates the rF heating mechanism, establishes geometric and mathematical models accounting for rock properties, and validates the mathematical model using laboratory experiments. The calculations reveal that lower specific heat, thermal conductivity, relative permittivity, and density of rocks, coupled with higher rock electrical conductivity, contribute to higher maximum reservoir temperatures. Additionally, the maximum heating distance increases with decreasing specific heat and density of rocks. Optimal values of thermal conductivity, relative permittivity, and electrical conductivity exist, maximizing the heating distance. These findings provide crucial guidance for optimizing rock properties, enhancing maximum heating temperature, and extending heating distances before implementing rF heating technology. Copyright 2024 ArMA, American rock Mechanics Association.

关键词： rock mechanics

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Active control of the fluid pulse based on the FxLMS

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Petroleum 2024年第4期10卷 745-758页

作者： Hai Yang Jie Liu Zexing Yang Haibo Liang Lizao Zhang Jialing Zou School of Mechanical and Electrical Engineering Southwest Petroleum UniversityChengdu610500China Chengdu Drainage Co. LtdChengdu610023China CNPC Engineering Technology R&D Company Limited Beijing102200China

In petroleum engineering,the performance of drilling fluid is the key factor affecting the drilling *** fluid rheology can be measured by tube *** pulsation will cause measurement deviation of differential pressure and flow velocity data during measurement,and it accumulates when the flow curve is ***,the accuracy of drilling fluid rheological pipe measurement is seriously *** view of the problem of fluid pulsation can seriously affect the accuracy of tube *** paper proposed an algorithm based on Filtered-x least mean square(FxLMS).First,the active control strategy is studied,the mathematical model of electric regulating valve control is established,the FxLMS algorithm of variable step length is studied,the simulation model of the control system is established,and the control effect of different algorithms is *** dynamic experimental platform of fluid pulse active control for drilling fluid rheological pipe measurement is designed and *** experimental data show that:after active control,the average relative error of drilling fluid shear force decreased by 179.6%,the average relative error of plastic viscosity decreased by 78.1%,and the average relative error of the apparent viscosity decreased by 25.5%.It proves that the active control algorithm can improve the accuracy of tube measurement more effectively.

关键词： drilling fluid Active control Fluid pulsation FXLMS rheology

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Study on rF Heating Mode of Heavy Oil reservoir rocks Based on Two Antenna Elements distributed along the Horizontal Well 58

Study on RF Heating Mode of Heavy Oil Reservoir Rocks Based ...

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

ISBN: (纸本)9798331305086

To achieve precise heating of reservoir layers with varying thicknesses using the rF (radio frequency) heating method while minimizing thermal energy loss, a novel solution is proposed leveraging a multi-antenna configuration. In this configuration, consisting of two antenna elements, the application of equal and distinct voltages to the antenna elements is categorized based on the diverse characteristics of the reservoir. Additionally, the impact of inter-antenna element distances on temperature profiles was thoroughly examined within these configurations. research results indicate that these configurations can effectively address varying heat requirements of the reservoir, whether necessitating more, less, or no additional heat, through the adjustment of both distance and voltage. This comprehensive approach offers a viable solution to enhancing the efficiency of heavy oil reservoir heating processes during rF heating in horizontal wells at the operational level. Copyright 2024 ArMA, American rock Mechanics Association.

关键词： Crude oil

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Case Studies of a Novel digital Twin System for real-Time Early Identification and Warning of Pipe Stuck

Case Studies of a Novel Digital Twin System for Real-Time Ea...

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2024 International Petroleum technology Conference, IPTC 2024

作者： Zhang, Jiawei Wang, Qing Zou, Lingzhan Yu, Jingping Li, Jijun Yang, Yun Zhang, Yang Zhao, Zhixue CNPC Engineering Technology R&D Company Limited Beijing China CNPC Daqing Exploratory & Drilling Engineering Company Daqing China CNPC CCDC Drilling & Production Technology Research Institute Xi'an China Drilling Engineering Technology Research Institute of CNPC Daqing Drilling Engineering Company Daqing China

ISBN: (纸本)9781959025184

Pipe stuck serves as one of the primary downhole accidents in drilling industry with consequences ranging from minor inconvenience to severe complications. despite the variation on its cause and mechanism, this downhole accident could be prevented or avoided based on early identification of its unique symptom or data behavior, provided intervention or remediation measures are taken promptly. While conventional prediction or recognition methods, which rely on the fluctuation amplitude and curve trends of surface drilling parameters, are subject to user experience and human error, it's often the case that their timeliness cannot be guaranteed. A novel digital twin system, based on the deviation of hook load, torque and SPP (Standpipe Pressure) from theoretical modeled values and rOC (rate of Change) of these three actual parameters, is developed for real-time early identification and warning of pipe stuck while drilling. A PSrI (Pipe Stuck risk Index) ranging from 0%-100% is proposed based on rOC and deviation for comprehensive evaluation regardless of drilling state. Both T&d and wellbore hydraulics models are adopted to model the theoretical hook load, torque and SPP within preset computing cycle. rOC and deviation thresholds, corresponding to three different risk levels as low (green), medium(yellow) and high(red), were obtained by using rFA (random Forest Algorithm) based on data of historical wells with and without pipe stuck accidents. Preventive or intervention measures are generally mandatory for on-site personnels or engineers once high-risk (red) alert is identified by the system. Several case studies are outlined to exhibit that the occurrence of pipe stuck accidents could be detected typically between 30 minutes and 2 hours ahead during back-reaming and tripping operations, which proved its potential for early identification and prevention of this downhole accident in real-time drilling. Cost containment and operational efficiency could be created with sys

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Experimental Investigation of Fracture Initiation Pressure reduction Mechanism through A New Hydraulic Pre-Pressurized Approach 10

Experimental Investigation of Fracture Initiation Pressure R...

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10th Academic Conference of Geology resource Management and Sustainable development 2022

作者： Zhang, Yang Pan, Zhikun Liu, Yuzhang Zhou, Fujian Yao, Jiang Ben, Li China University of Petroleum-Beijing Beijing China Engineering Technology R&D Company Limited CNPC Beijing China Bohai Drilling Engineering Company Limited CNPC China

ISBN: (纸本)9781713867821

Hydraulic fracturing is one of the most effective ways to promote oil and gas production, especially for unconventional hydrocarbon resources. However, for some unconventional reservoirs, such as ultra-deep tight sandstone formation and local stress intensified shale formation, the fracture initiation pressure is extremely high thus impeding hydraulic fracture initiation and extension. This paper provides a new hydraulic Pre - pressurized approach for the deduction of fracture initiation pressure. The 8 cm × 8 cm × 10 cm cuboid rock matrix was used to investigate the effect of pre-pressurized Pore pressure on the hydraulic fracture initiation pressure. results showed that as the pore pressure increased, the fracture initiation pressure decreased and a critical pre-pressurized pore pressure value existed. If the pore pressure exceeds this value, the hydraulic fracture initiation pressure would not be reduced. The hydraulic pressurized rate would decrease with the increase of pre-pressurized pore pressure. CT scan was also conducted and it indicated that the number of initialized hydraulic fractures around the wellbore has a positive relationship with the value of pre-pressurized pore pressure. Some additives such as acid and surfactant were also added to the fracturing fluid, according to the pre-pressurized experiments. The fracturing fluid with acid can reduce the fracture initiation pressure on a relatively big scale, while the fracturing fluid with surfactant can increase the complexity of hydraulic fracture networks. The experimental results clarify the mechanism of "pre-pressurized " to reduce rock fracture pressure, and form the optimization method of "pre-pressurized " modification fluid system formula regulation. The research results can provide a reference for field optimization of modification fluid system. © Geology resource Management and Sustainable development *** rights reserved.

关键词： Hydraulic fracturing

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research on the recognition and Characterization of Fractures in Coal rock Based on CT Scanning

Research on the Recognition and Characterization of Fracture...

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International Petroleum and Petrochemical technology Conference 2024, IPPTC 2024

作者： Ye, Zhilin Qu, Shiyuan Liu, Jianquan Gao, Xiang Jin, Yi CNPC Engineering Technology R&D Company Limited China Research Institute of Petroleum Exploration and Development China

Coal rock fractures play a vital role as key channels for gas migration and storage in the exploration and development of coalbed methane. The characteristics of these fractures, such as porosity distribution, specific surface area, and connectivity, directly impact the adsorption, diffusion, and permeability behaviors of coal reservoirs. Therefore, a detailed analysis of coal rock fracture characteristics is vital in assessing the extractability of coalbed methane and during its exploration and development process. Currently, techniques like imaging logging, seismic detection, and micro-CT are employed for characterizing and studying fractures at various scales. Among these, high-resolution non-destructive CT scanning technology, by constructing three-dimensional data models of core samples, enables a quantitative analysis of fracture distribution features and size parameters. Traditional digital image processing methods, such as threshold segmentation and binary segmentation, though advantageous in computational speed, have limitations in the accuracy of fracture identification. With the advancement of artificial intelligence technology, deep learning-based image processing techniques have increasingly become significant tools for fracture detection due to their powerful feature extraction capabilities. This study conducted micrometer-level CT scanning experiments on coal rock samples, using CT image processing technology to construct a digitalized coal rock core model. deep learning methods were applied for precise fracture identification, establishing an appropriate deep learning architecture and optimized parameters for coal rock fracture recognition. Furthermore, this paper provides a detailed quantitative characterization of the precisely identified fractures, offering robust technical support for the exploration and development of coalbed methane. The high-resolution nondestructive CT scanning technology and three-dimensional fracture network reconstruction

关键词： Computerized tomography

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Three-dimensional geomechanical model establishment and application based on complicated structures in yingxi area of qinghai oilfield 54

Three-dimensional geomechanical model establishment and appl...

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54th U.S. rock Mechanics/Geomechanics Symposium

作者： Qian, Wang Youyu, Wan Changkun, Cheng Shiduo, Liu Xinyuan, Feng Youmin, Liu CNPC Engineering Technology R&D Company Limited Beijing China Petrochina Qinghai Oilfield Company Dunhuang Gansu China

The Yingxi deep reservoir of Qinghai oilfield is very complicated. The reservoir has strong heterogeneity. The degree of fracture developed highly. The physical properties and in-situ stress vary widely. The geological structure is complex and there are many high-angle thrust faults. For such a complicated reservoir, the comprehensive evaluation in the stage of horizontal well design is an essential and important means to improve the production after hydraulic fracturing reconstruction. Well-seismic combination method is adopted to realize the expansion from "single well" to "reservoir". On the basis of one-dimensional geomechanical analysis, in combination with structural, geological and seismic data, the three-dimensional geomechanical parameter model was built, and detailed characterization of geomechanical parameters was described. Using advanced finite element simulator and large-scale parallel computing technology, a regional three-dimensional in-situ stress field model is established. On the basis of understanding the factors that affect the complexity of hydraulic fractures, it is realized that natural fractures, in-situ stress and brittleness are the main factors in the area. Completion quality index model is established by evaluating the characteristics of natural fractures, in-situ stress and brittleness. Combined with reservoir quality, the comprehensive evaluation index of reservoir was obtained. Fracturing stage optimization and perforation position optimization were carried out. © 2020 ArMA, American rock Mechanics Association

关键词： Fracture mechanics

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Progress in the application of graphene material in oilfield chemistry:A review

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Petroleum 2024年第2期10卷 175-190页

作者： Jinsheng Sun Yuanwei Sun Yong Lai Li Li Gang Yang Kaihe Lv Taifeng Zhang Xianfa Zhang Zonglun Wang Zhe Xu Zhiwen dai Jingping Liu School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580China CNPC Engineering Technology R&D Company Limited Changping10206China Nanchong Vocational and Technical College Nanchong637131China Oil&Gas Technology Research Institute of Changqing Oilfield Company Xi'an710000China CNPC Greatwall Drilling Fluids Company Panjin124000China

Graphene is a single atom thick crystal composed of carbon *** is the lightest,thinnest,strongest material that conducts heat and electricity well *** terms of application,by introducing oxygen-containing groups,graphene can be well dispersed in solvents,can be chemically modified and functionalized,or connected with other electroactive substances through covalent bond or non-covalent bond to form composite materials,which is conducive to further processing and *** application of graphene in oilfield chemistry started late,but developed *** has played an active role in drilling fluid,cementing fluid,fracturing fluid,displacement fluid and other oilfield working *** can enhance the temperature and salt resistance of working fluid and improve the effect of working *** this paper,several directions of graphene applications in oilfield chemistry,such as modified graphene,graphene copolymers and graphene nanoparticles,are reviewed in detail from the synthesis methods,action mechanisms and effects of graphene and its derivatives,and the frontier cases at this stage are *** the basis of the existing research,suggestions for the development direction of graphene materials in oilfield chemistry are given for a variety of graphene materials,aiming to provide guidance for the application of graphene in oilfield chemistry.

关键词： Oilfield chemistry Graphene Action mechanism Application Prospect

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