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57th US rock Mechanics/Geomechanics Symposium

作者： He, Aiguo Ma, Qingyuan Pang, Yuhan Zhang, Xujia Yin, Guojun Lu, Yunhu Xu, Nan Guan, Yueyang CNPC Engineering Technology R&D Company Limited Beijing China China Unversity of Petroleum Beijing China Beijing University of Chemical Technology Beijing China Oil and Gas Engineering Research Institute of Jilin Oilfield Company China

ISBN: (纸本)9780979497582

Breakthrough pressure, as an index to measure the sealing capacity of cap capillary, has always been the focus of gas storage seal integrity research. In this paper, using the method of SY-T5778-2013 to measure the rock gas breakthrough pressure, a breakthrough pressure test was carried out on the rock samples from the cover of the hydrogen storage reservoir of Well Jintanmao 17, and the influence law of the alternate load, porosity, permeability and breakthrough gas on the breakthrough pressure was analyzed. The results show that: (1) the breakthrough pressure of rock is mainly controlled by the permeability and other parameters, and the permeability is negatively correlated with the breakthrough pressure;(2) The alternating load before the yield point increases the core breakthrough pressure, and the alternating load after the yield point causes the core breakthrough pressure to decrease;(3) The air breakthrough pressure of mudstone is greater than the helium breakthrough pressure under the same conditions. The research results have guiding significance for comprehensive evaluation of gas storage cap bed dynamics. © 2023 57th US rock Mechanics/Geomechanics Symposium. All rights reserved.

关键词： Hydrogen storage

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Feasibility study on short radius sidetracking technology of old well in Hoja Gulluk Gas Field - A case study of H-1 well 6

Feasibility study on short radius sidetracking technology of...

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2023 6th International Workshop on Environment and Geoscience, IWEG 2023

作者： Li, Hangyuan Zhou, Tuo Jin, Yulai Zhou, Haiqiu Xiao, Yue Gu, Yixin Baletabieke, Bahedaer CNPC Engineering Technology R&D Company Limited Beijing102206 China College of Petroleum Engineering Beijing China National Engineering Research Center for Oil and Gas Drilling and Completion Technology Beijing China

The Hojaguruk block is located in the central and eastern region of the Amu darya river. The reservoir is a hard carbonate reservoir with abnormally high pressure formation, which makes well control difficult. The reservoir is covered with a thick salt paste layer, and it is difficult to drill directional well in the salt paste layer. As the central and eastern parts of the right bank of the Amu darya river enter the late stage of development, the production capacity of old lying Wells is insufficient and the reservoir energy power is reduced. Therefore, it is urgent to transform old Wells with short radius sidetracking drilling technology and revive lying Wells to improve the production of single well and achieve the goal of stable production and increase production. Based on a comprehensive analysis of the geological characteristics, development situation and technical difficulties of short radius sidetracking in the area where well H-1 is located, this paper analyzes and demonstrates the determination of the cutting point of sidetracking technology, the optimization of the well trajectory design scheme and the analysis and demonstration of the ultra-short radius sidetracking technology, and considers all factors comprehensively to study and determine that the ultra-short radius sidetracking technology is suitable for this well condition. It can meet the requirements of reservoir development design. It is suggested to carry out the key test of the ultra-short radius sidetracking technology, and promote the application in the developed blocks in the central and eastern part of the Amu darya Project, so as to provide research ideas and directions for tapping the potential operations in other blocks. © Published under licence by IOP Publishing Ltd.

关键词： Horizontal wells

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New understanding of non-uniform propagation mechanism of horizontal fractures in shallow high-permeability reservoirs and research on main controlling factors 58

New understanding of non-uniform propagation mechanism of ho...

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

作者： Qiao, Yan Zhang, Yang Shang, Litao Chen, Xidi Chen, Zhao Lei, Fan Bai, Jie CNPC Engineering Technology R&D Company Limited BeiJing China PetroChina Daqing Oilfield Company Daqing China PetroChina Zhejiang Oilfield Company Hangzhou China PetroChina Tuha Oilfield Company HaMi China Research Institute of Petroleum Exploration & Development BeiJing China

ISBN: (纸本)9798331305086

The Changyuan block of daqing oilfield in China has a shallow reservoir burial depth (100md), is in the late stage of development, and has a high water content (>95%).Hydraulic fracturing produced non-uniformly propagating horizontal *** present, the mechanism and controlling factors of non-uniform propagation of horizontal fractures are not well *** this paper, based on the geological numerical model of Changyuan block, the non-uniform propagation of horizontal fracture is *** main conclusions are as follows: the horizontal fracture will expand in the direction of large fracture initiation stress difference (minimum horizontal principal stress - vertical stress);the main controlling factors for the non-uniform propagation of horizontal fracture are construction net pressure, temporary plugging distance, fracture initiation stress difference and its non-uniformity;with the increase of the fracture initiation stress difference non-uniformity, horizontal fractures increased flow conductivity, and the cumulative oil production volume will be *** micro-seismic monitoring results show that the non-uniform propagation law of horizontal fracture is in line with the actual *** is of great significance for the redevelopment of the shallow layer of the old oilfield. Copyright 2024 ArMA, American rock Mechanics Association.

关键词： Horizontal wells

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Study and Application on Expandable Tubular Open Hole Clad technology 11th

Study and Application on Expandable Tubular Open Hole Clad T...

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11th International Field Exploration and development Conference, IFEdC 2021

作者： Jia, Tao Zhang, Quan-li Xu, Bing-gui He, Fei Chen, Ying-yan CNPC Engineering Technology R&D Company Limited Beijing China Southwest Oil and Gas Field Company of PetroChina Chengdu China Chuanxi Drilling Company of CNPC Chuanqing Drilling Engineering Company Limited Chengdu China

ISBN: (纸本)9789811921483

The designed casing program is difficult to meet the requirements of actual drilling in deep or complex wells as the complexity formation pressure system is difficult to predict in the formation. A casing program extended scheme based on expandable tubular open hole clad technology (OHC) is proposed in order to solve the sudden complex pressure system formation or severe leakage formation in the deep well or complex well drilling. The technical principle and characteristics of OHC are elaborated and the key techniques and parameters are analyzed in this paper. The macro and micro performance tests and evaluation methods of the high-performance expandable tube after expansion are proposed and then the safety application boundary of the high-performance expandable tube is confirmed. Field application of OHC was carried out in Ning X well which is a shale gas well in southwest oil and gas field in dec 2020. The purpose of the installation was to clad the 8–1/2 in. hole section with severe leakage, solve the drilling problems caused by the insufficient design casing program, reduce the non-production time caused by lost circulation, and ensure the safe drilling in pay formation. 2480 feet of 7–5/8 in. expandable tube was set in 8–1/2 in. hole that had been under-reamed. Following the successful expansion of the expandable tube, the drift diameter is 7–1/2 in. The field application indicates that the OHC can effectively clad the complex formation, treat the severe leakage and extend the casing program. The technology provides an effective solution to achieve the goal of safe drilling and exploration and development. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Expandable tubes

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Formation mechanism and reservoir quality evaluation in tight sandstones under a compressional tectonic setting: the Jurassic Ahe Formation in Kuqa depression, Tarim Basin, China

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Petroleum Science 2025年第3期 998-1020页

作者： dong Li Gui-Wen Wang Kang Bie Jin Lai de-Wen Lei Song Wang Hai-Hua Qiu Hong-Bo Guo Fei Zhao Xing Zhao Qi-Xuan Fan National Key Laboratory of Petroleum Resources and Engineering China University of Petroleum (Beijing) College of Geosciences China University of Petroleum (Beijing) Research Institute of Petroleum Exploration and Development Tarim Oilfield Company CNPC R&D Center for Ultra-Deep Complex Reservoir Exploration and Development CNPC Exploration Division Xinjiang Oilfield Company CNPC

The northern structural belt of Kuqa depression is adjacent to the South Tianshan orogenic belt, which are characterized by complex geological conditions. The reservoir quality of the Jurassic Ahe Formation is controlled by sedimentation, diagenesis, and tectonics, and show complex pore structure and strong heterogeneity, thereby hindering effective natural gas exploration and development. Core, thin sections,cathodoluminescence(CL), scanning electron microscopy(SEM), conventional well logs and image logs are used to characterize the petrological characteristics and pore systems. Then a comprehensive analysis integrating sedimentation, diagenesis, and tectonics is performed to unravel the reservoir formation mechanism and distribution of reservoir quality. results show that reservoir properties are generally environmentally selective. Coarse grained sandbodies(gravelly sandstones) formed in high depositionalenergy have the best physical properties, while fine sandstone and mudstone with low depositional energy is easily to be tightly compacted, and have poor reservoir quality. Porosity usually decreases with compaction and cementation, and increases due to dissolution. Clay minerals filling pores result in a deterioration of the pore structure. Microfracture formed by fracturing can connect the matrix pores,effectively improving the reservoirs' permeability. The differential distribution of fractures and in-situ stress plays an important role in modifying reservoir quality. The in-situ stress has obvious control over the matrix physical properties and fracture effectiveness. The matrix physical properties are negatively correlated with the value of horizontal stress difference(Δσ). As the value of Δσ increases, the pore structure becomes more complex, and the macroscopic reservoir quality becomes poor. The smaller the strike divergence between the natural fracture and SHmax, the lower the value of Δσ in the fracture layers is, and the better the fracture effectivene

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research and application of underbalanced drilling technology for deep shale gas horizontal wells in southern Sichuan 57

Research and application of underbalanced drilling technolog...

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57th US rock Mechanics/Geomechanics Symposium

作者： Fu, Li Yang, Henglin Ye, Xinqun Wang, Yuan Chen, Gang Yuan, Guangjie Zhang, Heng Wang, Zixin CNPC Engineering Technology R&D Company Limited Beijing China National Engineering Research Center of Oil & Gas Drilling and Completion Technology Beijing China Petro China Oil & Gas and New Energy Company Beijing China

ISBN: (纸本)9780979497582

deep shale gas has become an important alternative resource for shale gas development in China, and the number of horizontal wells drilled is increasing year by year. However, the rate of penetration, bottom hole temperature and leakage in horizontal section are seriously restricted by the high mud weight. Firstly, an underbalanced drilling technology strategy and mud weight reduction implementation process in shale reservoir are proposed. Secondly, based on the identification of abnormal high pressure mechanism, the pore pressure prediction model is optimized, and the fluid-solid-thermal coupling collapse pressure prediction model of fractured shale reservoir is established according to the characteristics of shale bedding. Finally, combined with the three-dimensional geological model, the safety window distribution of mud weight is clarified, and the favorable area of underbalanced drilling operation is divided. The underbalanced drilling technology has been tested in 10 horizontal wells. Compared with the conventional drilling wells, the rate of penetration, temperature control and leakage control is obviously improved. When the mud weight is reduced by 0.2 ~ 0.45g/cm3, the bottom hole circulation temperature is reduced by 3 ~ 8 °C, the average rate of penetration is increased by 17 %, and the average leakage and loss time of single well are reduced by 239m3 and 207h respectively. © 2023 57th US rock Mechanics/Geomechanics Symposium. All rights reserved.

关键词： Horizontal wells

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Crude oil wax:A review on formation,experimentation,prediction,and remediation techniques

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Petroleum Science 2022年第5期19卷 2343-2357页

作者： Wyclif Kiyingi Ji-Xiang Guo rui-Ying Xiong Li Su Xiao-Hui Yang Shi-Ling Zhang Unconventional Petroleum Research Institute China University of PetroleumBeijing102249China Sinopec Northwest Oil Field Branch UrumqiXinjiang830011China CNPC Engineering Technology R&D Company Limited BeijingChina

Wax deposition during crude oil production,transportation,and processing has been a headache since the early days of oil *** may lead to low mobility ratios,blockage of production tubing/pipelines as well as fouling of surface and processing facilities,among *** snags cause massive financial constraints increasing projects’*** of meticulous research have been dedicated to this problem that is worth a ***,this paper reviews the mechanisms,experimentation,thermodynamic and kinetic modeling,prediction,and remediation techniques of wax *** overall assessment suggests that available models are more accurate for single than multi-phase flows while the kind of remediation and deployment depend on the environment and severity *** severe cases,both chemical and mechanical are synergistically ***,future prospective research areas that require attention are ***,this review could be a valuable tool for novice researchers as well as a foundation for further research on this topic.

关键词： Oil wax Phase modeling Inhibitors dispersants Multi-phase flow

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Optimization Model of Fracture Parameters of Shale Gas Fracturing Horizontal Well Based on Genetic Algorithm

Optimization Model of Fracture Parameters of Shale Gas Fract...

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2023 Middle East Oil, Gas and Geosciences Show, MEOS 2023

作者： Zhao, Xurong Lan, Tian Tang, Zekai Mu, Lingyu Hu, Lianbo Song, Zhigang Chen, Zhiming Zhou, Yicheng China University of Petroleum at Beijing China CNPC Engineering Technology R&D Company Limited China King Fahd University of Petroleum and Minerals Saudi Arabia

ISBN: (纸本)9781613999806

Based on a genetic algorithm and field production data, this paper reasonably optimizes the fracture parameters of multistage fractured horizontal wells (MFHWs). First, a mathematical model of MFHWs in shale gas reservoir is proposed under the conditions of variable production and variable pressure. Then, the main factors affecting well production are determined by sensitive analysis. Finally, the production prediction model based on a genetic algorithm (GA) is used to optimize the fracture parameters of the Fuling shale gas reservoir. The results show that in the study area, the number of fractures in typical wells is 10, and the fracture half-length is 90m, and the fracture conductivity is 15.24md.m. The effective fracture half-length is the main parameter affecting production, so the effective fracture half-length and effective fracture number should be increased reasonably, and the support concentration should be increased properly. What's more, the optimal solution of fracture half-length is 160m, and the optimal solution of fracture number is 8, and the optimal solution of fracture conductivity is 20 md·m. This paper provides a new idea based a genetic algorithm for optimizing fracture parameters of shale gas wells in the Fuling area. Copyright © 2023, Society of Petroleum Engineers.

关键词： Genetic algorithms

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driving Cost reduction in CCUS Projects: Innovating Qualification Technologies to replace Expensive CrA with Cost-Efficient Glass Fiber Polymer Composites

Driving Cost Reduction in CCUS Projects: Innovating Qualific...

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Offshore technology Conference, OTC 2025

作者： Zhao, L. dunne, T. ren, J.X. Li, W.H. Cheng, P. CNPC USA HoustonTX United States CNPC Engineering Technology R&D Company Limited Beijing China

ISBN: (纸本)9781959025610

The imperative role of Carbon Capture, Utilization, and Storage (CCUS) in achieving the global carbon emissions reduction target of 15-20% by 2050 is widely recognized. However, the sluggish progress in CCUS deployment stems primarily from substantial initial capital outlays, notably attributed to the use of costly Corrosion-resistant Alloys (CrA). These alloys are essential due to the corrosion challenges posed by supercritical CO2 from the capture facility to the injection wells. Glass Fiber reinforced Polymer Composite (GFPC), with its high corrosion resistance and excellent mechanical strength, emerges as a costefficient alternative to CrAs. despite this potential, GFPC faces challenges related to limited data, poor understanding of degradation mechanisms, especially in supercritical CO2, and difficulties in evaluating its operational lifespan. To expedite the adoption of GFPC, this study systematically investigates the degradation mechanisms of GFPC in CCUS injection wells and introduces an industry-crucial model for qualifying GFPC grades for long-term usage as downhole liners. Conventional GFPC tubular qualification methods involve excessively long aging tests (e.g., 417 days as per ISO 14692) with overly conservative safety margins, making qualification cost- and time-prohibitive. To overcome this challenge, a mature GFPC grade with over 50 years of field deployment data was chosen, and a novel accelerated lab testing method (completed in 56 days) was established by plotting mechanical property decay as a function of time at temperatures below its glass transition temperature. Systematic investigations, employing various characterization tools, were conducted to analyze microstructure changes, polymer/fiber bond alterations, and thermomechanical property variations. A numeric degradation model was developed by correlating lab test results with long-term field data to provide a reasonable evaluation of the long-term application of GFPC as liner materials in s

关键词： Corrosion resistant alloys

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Numerical Simulation of Proppant Heterogeneous distribution in Shale Gas reservoirs

Numerical Simulation of Proppant Heterogeneous Distribution ...

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2023 Abu dhabi International Petroleum Exhibition and Conference, AdIP 2023

作者： Hou, Tengfei Zhang, Yang Shang, Litao Zhang, Shiling Xiao, Fengchao Bai, Haoli Sun, Xun Qiao, Yan Xu, Gang Zhang, Qingyao CNPC Engineering Technology R&D Company Ltd Beijing Beijing China China University of Petroleum Beijing China The Exploration Department of PetroChina Qinghai Oilfield Company Gansu Dunhuang China

ISBN: (纸本)9781959025078

Slickwater fracturing with high injection rate and large volume has been widely used in the development of shale reservoirs, while the proppants cannot distribute uniformly in fracture networks, usually in the forms of sand-bed, separated pillars and local displacement. Thus, there are still some key issues need to be figured out for better fracturing design, such as the proppant placement status in complex fractures, and how to achieve effectively propped fractures, etc. In this paper, a three-dimensional proppant transport model is established by dense discrete Phase Model (ddPM). The flow field and concentration distribution of the proppants were analyzed, by tracking the trajectory of proppants in different types of complex fractures. Besides, the placement status of particles in the primary and secondary fractures was analyzed. In addition, we also conducted the research on proppant transportations in perf clusters. Finally, according to actual fracturing treatment schedule, three different sizes of proppants were gradually injected and the distribution law of the proppants was studied. Based on the concentration distribution of proppants in the complex fractures, fractures can be divided into four zones: pure fluid zone, critical suspension zone, flowing slurry zone and settling bed zone, while the critical suspension zone and flowing slurry zone of secondary fracture are smaller than primary fracture. Besides, the proppants concentration entering into the fractures far from the entrance is more than that entering the fractures near the entrance. The ratio of proppant concentration into each perf cluster (3 clusters per stage) is about 1:1.5:2, while that concentration ratio is 1:1.25:1.6:2 in four clusters per stage scenario, while the proppant concentration is inversely proportional to the amount of proppant and liquid injected. The proppants of 100 mesh injected in the early stage migrates to the far end of the fracture, and some enters into the branch frac

关键词： Proppants

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