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Abu dhabi International Petroleum Exhibition and Conference 2022, AdIPEC 2022

作者： Chang, Long Zou, Lingzhan Wang, Haige Yu, Yangfei Liu, Qi Zhuo, Lubin Yu, Jing Wu, Baocheng Xu, Jiangwen Shi, Jiangang CNPC Engineering Technology R&D Company Limited PetroChina Xinjiang Oilfield Company China

ISBN: (纸本)9781613998724

The Triassic Baikouquan Formation reservoir in the Mahu Sag, Junggar Basin is characterized by tight sandy conglomerate oil reservoir with long drilling cycle and great fracturing difficulty. The factory drilling and fracturing techniques of horizontal wells for the Ma131 Well Block of Mahu Oilfield have been determined by regional geological characteristics research and optimization scheme design. The key technologies for horizontal well drilling speed improvement were explored by designing small three-stage wellbore structure, customizing the PdC bit properly, optimizing drilling tool combination, and selecting the drilling fluid with inhibition and plugging ability. The factory reservoir stimulation technique carried out horizontal well hydraulic fracturing with small well spacing for two sets of beds, and adopted bridge plug + clustering perforation staged fracturing and slick water + gel composite fracturing technology. 12 wells in a drilling pad were arranged in the demonstration area with the depth of 5000m, the distance between adjacent sections was 150m or 100m, with the horizontal section length of 1800m. Batching drilling operation pattern was adopted, with 3⁃well drilling for each of rig. rapid inclining prevention drilling through vertical sections adopted PdC bit + screw + MWd, with high rotary speed and high flow rate. In the build-up section, radical drilling parameters was used to improve the top drive rotary speed and release the torque. In the horizontal sections, rotary steering tool + low speed high torque screw was adopted. The application of this technology achieved good results, with average drilling cycle of 48.3 d and average rOP of horizontal section increased by 77%. The fracturing construction adopted high pad fluid ratio, high sand ratio and high pump rate. More than 10,000 m3 fluid was injected in a single well with high-intensity proppant injection. The factory operation was carried out in the order of construction from the two sides

关键词： Horizontal wells

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Low-Tension-Gas Flood in a High-Temperature and Heterogeneous Sandstone reservoir

Low-Tension-Gas Flood in a High-Temperature and Heterogeneou...

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2024 SPE Improved Oil recovery Conference, IOr 2024

作者： Abdullah, Mohammad B. delshad, Mojdeh Niu, Fangya Mohanty, Kishore Sepehrnoori, Kamy Li, Jianshen Zhou, Nancy C. Lu, Meng Miao, Jijun The University of Texas at Austin AustinTX United States CNPC Engineering Technology R&D Company Limited Beijing China CNPC USA KatyTX United States SimTech KatyTX United States

ISBN: (纸本)9781959025245

This study explores Low-Tension-Gas (LTG) flooding as a hybrid low-tension surfactant and nitrogen gas-enhanced oil recovery method for a high-temperature (90-100°C), heterogeneous (permeability 0.06 µd-1180 md), sandstone reservoir. We began with history-matching two corefloods, an outcrop, and a reservoir core, employing the in-house UTCHEM simulator. Flow parameters were derived from these core floods, and fluid properties were ascertained from lab experiments. A 0.6-acre pilot-scale model in UTCHEM, based on field data and geostatistics, was used to simulate the LTG process. The comprehensive field scale sensitivity study indicates an additional oil recovery factor (rF) between 11-18% from LTG injection, influenced primarily by residual oil saturation to waterflood, injection rate, LTG slug size, and surfactant concentration. Gravity segregation between gas and microemulsion phases, affected by reservoir vertical heterogeneity, emerged as a critical factor. A lower kv/kh ratio led to a more stable front with a moderate gas override. An optimal chemical injection design involves 1 wt% surfactant concentration within 1 pore volume of LTG slug. Higher injection rates resulted in increased oil recovery and shorter pilot duration, though constrained by field operational limits. Adjusting foam quality during LTG injection affected gravity segregation, necessitating further lab experiments for correlation with gas mobility reduction. Foam shear thinning could enhance field foam injectivity without significantly impacting cumulative oil recovery. Increasing the injection rate within allowable injection bottomhole pressure is recommended for field implementation to prevent fracture induction. This is the first study that extensively explores the impact of reservoir and design parameters for LTG injection for challenging reservoir conditions. Copyright © 2024, Society of Petroleum Engineers.

关键词： Gases

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Opportunities,Challenges and Countermeasures for Construction of China's CCUS Industrial System

Opportunities,Challenges and Countermeasures for Constructio...

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2024国际石油石化技术会议

作者： Bing LI Bo ZHOU Pingliang FANG JingYU Liu HE Boyu SI CNPC Engineering Technology R&D Company Limited

Under the national 'dual carbon' goal,it is a Chinese strategic choice to develope carbon dioxide capture,utilization and storage(CCUS) vigorously in order to reduce carbon dioxide emissions and ensure future energy security,which is also an essential approach to foster ecological civilization and achieve sustainable ***,Chinese CCUS technology has been laid the solid foundation for widespread *** industrial developmen,with a mature CCUS technology and industrial system in *** China's carbon trading market and the establishment of industrial policies and financial ecosystem have been built,CCUS has entered a fast lane of rapid ***,compared to foreign counterparts in the CCUS industry,China's future industrial system and its development still face numerous challenges concerning technology advancement,industrial integration,as well as policy *** light of both domestic and international circumstances,this paper analyzes the status quo of CCUS demonstration projects,CCUS industrial systems,CCUS technologies and policies at home and abroad,and points out the problems and shortcomings of China's CCUS industry in key technology breakthroughs,formation of industrial clusters,market mechanisms and policy incentives through benchmark-based research,and proposes recommendations for future developments in the CCUS industry by focusing on establishing a productive system with innovative technology that benefits the entire industrial chain;achieving large-scale deployment through emerging industrial chains;promoting coordinated growth among enterprises along the entire value chain;as well as strengthening relevant laws and regulations.

关键词： Opportunities,Challenges and Countermeasures for Construction of China's CCUS Industrial System

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research Progress of Micro-CT in the Field of Petroleum engineering 13th

Research Progress of Micro-CT in the Field of Petroleum Engi...

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13th International Field Exploration and development Conference, IFEdC 2023

作者： Ye, Zhi-Lin Lu, Hai-Wei Gao, Xiang Liu, Jian-Quan Jin, Yi CNPC Engineering Technology R&D Company Limited Beijing China Research Institute of Petroleum Exploration and Development Beijing China Drilling and Production Technology Research Institute PetroChina Jidong Oilfield Company Hebei China

ISBN: (纸本)9789819704675

Computerized Tomography (CT) technology has gained wide development in the field of petroleum geology due to its unique advantages in rapid, high-precision, non-destructive analysis, and three-dimensional imaging for microstructure analysis. This article reviews the research progress of CT scanning technology in the field of petroleum engineering in recent years and summarizes its applications in reservoir microstructure, rock and mineral properties, digital core simulation, and non-destructive analysis of rubber materials. Quantitative characterization information such as reservoir pore structure, mineral composition, particle size distribution, and fracture identification can be obtained through three-dimensional image analysis. By constructing digital cores, rock physical properties such as elasticity, permeability, electrical properties, and oil-water distribution can be further studied. In addition, CT scanning and imaging technology have also been gradually applied to defect analysis in rubber materials, providing new technical means for predicting their failure behavior. The construction of digital cores based on CT scanning technology has become a research hotspot in the petroleum field, providing technical support for the three-dimensional visualization and fine quantitative characterization of rock structures. In the future, achieving the integration of digital core data and constructing an application platform from core to reservoir, from micro to macro scales, is the development trend of high-precision CT scanning combined with computer technology. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Computerized tomography

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design Method and reliability Analysis of deep Well Casing Strength

Design Method and Reliability Analysis of Deep Well Casing S...

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International Petroleum and Petrochemical technology Conference 2024, IPPTC 2024

作者： Yaxuan, Wang Jiayu, He Hongzhi, Xue Zhiyong, Wei Wang, Lin Weixing, Zhu CNPC Engineering Technology R&D Company Limited Beijing102206 China EnerTech-Drilling & Production Co. CNOOC Energy Technology & Servies Limited Tianjin300452 China

With the development of the petroleum industry, more and more oil fields are beginning to engage in deep well exploration. deep well casing is an important drilling equipment in oilfield development, which is a key factor in ensuring wellbore stability, maintaining production safety, and improving production capacity. However, due to the high requirements for equipment in drilling operations, problems in the design, manufacturing, and installation of deep well casing can easily lead to issues such as poor wellbore stability, oil leakage, and drilling accident safety. Therefore, the performance and reliability evaluation of deep well casing has become a key issue. This article summarizes the research progress of deep well casing strength design methods and reliability analysis through extensive research on existing literature. The main content includes the working principle, design standards, and advantages and disadvantages of different methods of deep well casing, aiming to provide reference for the design and use of deep well casing. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： deep oil well drilling

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Numerical analysis of fracture propagation behavior in hot dry rock during radial borehole fracturing 57

Numerical analysis of fracture propagation behavior in hot d...

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57th US rock Mechanics/Geomechanics Symposium

作者： Zou, Wenchao Huang, Zhongwei Sun, Yaoyao Wu, Xiaoguang Long, Tengda Huang, Pengpeng Yu, Huiyong China University of Petroleum-Beijing Beijing China CNPC Engineering Technology R&D Company Limited Beijing China Engineering Technology Research Institute of Xinjiang Oilfield Company Xinjiang China

ISBN: (纸本)9780979497582

radial well fracturing is a promising stimulation method, which shows great potential in addressing the issues suffere in enhanced geothermal system (EGS), such as poor connectivity and difficulty in controlling the fracturing paths. To determine th applicability of radial borehole fracturing in Hdr, a THM-FdEM coupling model for studying the fracture propagation behavior o radial borehole fracturing is established. Firstly, the reliability of the coupled THM model is validated by radial borehole fracturin experiments. Then, the effects of azimuth, number, length and spatial distribution of radial boreholes on fracture propagation behavio are analyzed. The results show that implementing radial borehole fracturing in Hdr can overcome the adverse effects of in-situ stress allowing fractures to expand in the desired direction. Increasing the number and azimuth of radial borehole while decreasing thei length can increase the angle of fractures deviating from the direction of maximum horizontal principal stress. In the case of double branch, a branch angle of 60°can result in stress interference between radial boreholes, inhibiting fracture propagation from the to of the radial borehole. The research findings of this study are expected to provide valuable guidance for the field application of radia borehole fracturing in Hdr geothermal reservoirs. © 2023 57th US rock Mechanics/Geomechanics Symposium. All rights reserved.

关键词： Boreholes

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Study on Parameters Optimisation of Fracturing Stages & Perforation Clusters in Luzhou deep Shale Gas Horizontal Wells Based on Integrated drilling and Logging data

Study on Parameters Optimisation of Fracturing Stages & Perf...

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2023 Asia Pacific Unconventional resources Symposium, APUr 2023

作者： Yuan, L. Hu, S.L. Mu, L.Y. Wang, d.L. Yang, X.T. Song, Y. Wang, J.C. CNPC Engineering Technology R&D Company Limited China CNPC Oilfield Service Company Limited China PetroChina Southwest Oil and Gas Field Branch China PetroChina Xinjiang Oilfield Branch China

ISBN: (纸本)9781959025146

Considering the high temperature environment and high operation cost, only a small number of deep shale gas horizontal wells in Luzhou would conduct logging in horizontal sections. If the neighboring wells were rather far away, it would be difficult to accurately obtain the reservoir heterogeneity along the lateral;therefore, most completions were designed geometrically, with little or no guidance for the location optimizations of fracturing intervals & perforation clusters. In such a case, it was most likely to occur a low opening rate of perforation clusters in the same stage, resulting in a poor stimulation effect. For the first time, this paper proposed a novel optimization method for the fracturing parameters of horizontal sections based on integrated drilling & logging data. Firstly, the available data type was evaluated. If the logging data was missing, geometrically designed stages and clusters would be relocated based on drilling data;otherwise, it could be easily accessible by logging data. Then, when relocating, the drilling data (torque, drilling pressure, mechanical drilling speed, etc.) were used to calculate the rock mechanical specific energy (rMSE) along the lateral. Next, the rMSE values were calibrated with the indoor rock mechanics experiments to establish a standard classification of Luzhou deep shale rock hardness. Finally, based on the principle of similar rock hardness, the perforation clusters in the same fracturing stage were re-positioned to ensure their locations at the same or adjacent rock hardness level. The above design method was applied and verified in Luzhou deep shale gas wells, the results demonstrated that, after the geometrically distributed segments & clusters were adjusted and relocated, their positions had a high matching rate of 85.47% with the optimized design of fracturing segments & perforation clusters using logging data. What’s more, the VideoLog technology was utilized to observe the erosion of the perforation holes a

关键词： rock mechanics

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A Three-dimensional Model for the Formation Pressure in Wellbores under Uncertainty

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Fluid dynamics & Materials Processing 2023年第9期19卷 2305-2314页

作者： Jiawei Zhang Qing Wang Hongchun Huang Haige Wang Guodong Ji Meng Cui Hongyuan Zhang Strategic Planning and Technical Support Institute CNPC Engineering Technology R&D Co.Ltd.Beijing102206China

Formation pressure is the key parameter for the analysis of wellbore *** increasing drilling depth,how-ever,the behavior of this variable becomes increasingly *** this work,a 3d model of the formation pres-sure under uncertainty is *** a relevant algorithm is ***,the logging data of regional key drilling wells are collected and a one-dimensional formation pressure proﬁle along the well depth is ***,a 3d model of regional formation pressure of the hierarchical group layer is deﬁned by using the Kriging interpolation algorithm relying on a support vector machine(SVM)and the formation pressure of the drilled *** validate the method,the formation pressure of one pre-drilled well is compared with the well logging *** comparison reveals that the maximum relative error is less than 4.5%.The software based on this model is complemented by a computer visualization technology,which provides a relevant tool for under-standing and analyzing the 3d formation *** outcomes of this study are intended to support the char-acterization of areas with missing or poor 3d seismic data and provide more accurate information for the analysis of wellbore integrity.

关键词： Formation pressure with uncertainty well integrity kriging interpolation 3d pressure body

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Temperature distribution of Heavy Oil reservoirs under radio Frequency Heating and Analysis of Influencing Factors 57

Temperature Distribution of Heavy Oil Reservoirs under Radio...

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57th US rock Mechanics/Geomechanics Symposium

作者： Xiao, Jiexian Gao, deli dong, Xuelin Feng, Chaochao Wang, Zhengxu MOE Key Laboratory of Petroleum Engineering China University of Petroleum Beijing China CNPC Engineering Technology R&D Company Limited Beijing China

ISBN: (纸本)9780979497582

Heavy oil is increasingly gaining more concerns from all over the world. However, the steam methods applied broadly are gradually being abandoned due to low efficiency and high carbon emissions. Therefore, a radio frequency (rF) heating technology is proposed which mobilizes heavy oil by using rF electromagnetic wave (rF-EMW) rather than steam. To accurately obtain the temperature distribution of heavy oil reservoir, an electromagnetic-thermal coupling model is established initially. The model considers the thermal properties change the heavy oil reservoir with temperature. Afterward, the model is validated by experimental data. Finally, the influence of several key factors on the reservoir temperature are discussed. Calculation results display that the maximum heating radius of the rF heating technology is up to 10m, which indicates that rF heating has obvious technical advantages. The model considering the varying specific heat brings about lower reservoir temperature around the wellbore, and the maximum temperature is obviously higher than that in the case of varying thermal conductivity. In addition, the reservoir temperature can be enhanced by increasing the relative permittivity of reservoir, porosity, electrical conductivity and saturation of water. The research results are intended to provide important guidance for the field application of rF heating technology. © 2023 57th US rock Mechanics/Geomechanics Symposium. All rights reserved.

关键词： Temperature distribution

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Scheme design of annular pressure control by rupture disk technology 34th

Scheme design of annular pressure control by rupture disk te...

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34th International Ocean and Polar engineering Conference, ISOPE 2024

作者： Wang, Gang Lv, Shengming Xiang, Ying Liu, Yuhan Ye, Yu Ji, Fei Zhou, Tuo Jiang, Quanyu Cao, Jinyan CNPC Engineering Technology R&D Company Limited Beijing China China National Oil and Gas Exploration and Development Company Ltd Beijing China China University of Petroleum in Beijing Beijing China

ISBN: (纸本)9781880653784

deepwater oil and gas wells experience elevated wellbore temperatures during exploratory well testing and production well production, which generate expansion pressure and the phenomenon of elevated annulus pressure (APB). The annulus annulus pressure may trigger risks such as casing body damage, casing buckle leakage, etc., destroying the wellbore integrity of deepwater wells and posing serious safety risks to deepwater wellbore integrity. Therefore, deepwater oil and gas wells must adopt an annulus pressure management program. According to the engineering application experience, the rupture disk casing tool is a low-cost annulus pressure solution that is currently effective and widely used. In this paper, we study the pressure specification design of rupture disk to meet the requirement of annular pressure management in deepwater wells, and carry out the program design of rupture disk technology to control the annular pressure. When the annulus closure pressure exceeds the design threshold, the annulus high-pressure fluid overflows from the rupture disk, and the annulus closure pressure decreases, thus solving the problem of high annulus pressure. © 2024 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： rupture disks

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