检索结果-内蒙古大学图书馆

SSRN 2023年

作者： Hu, Jinchuan Chen, Yu Jia, Cunqi Hou, TengFei Qi, Peng CNPC Engineering Technology Research and Development Company Limited China

Steam-Assisted Gravity Drainage (SAGD) is an effective thermal method for bitumen recovery around the world. Steam injected releases latent heat at the chamber edge, and bitumen heated and condensate flow to the bottom producer under gravity. One important control that affects SAGD performance is the thermal transmission beyond the edge of steam chamber. Some classical theories used to ignore convection and think conduction as the dominant mechanism to transfer heat. Although some studies have been carried on convection induced by pressure gradient or thermal expansion, few people focus on the influence of reservoir properties considering thermal transmission beyond the edge of steam chamber. In this article, based on fundamental theories, a semi-analytical model of thermal transmission is derived, in which reservoir properties are variational with the change of temperature and pressure, and more accurate temperature profile and reservoir properties profile are acquired compared with the models with constant reservoir properties. Under the circumstances of changing properties of reservoir, the relation between conduction and convection beyond the edge of steam chamber is contrastively analyzed, yielding the result that the ratio of convection and conduction gradually decreases. In the mobile oil region, convection is the dominant mechanism, whereas conduction and convection transfer heat together as distance increases. This study also analyzes the effect of parameters on heat transfer performance and temperature profile, such as steam temperature and the chamber edge propagation speed, and gives suggestions on enhancing heat efficiency and reducing steam usage. © 2023, The Authors. All rights reserved.

关键词： Thermal expansion

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research on Cement Sheath Integrity Under High Temperature During In-Situ development for Shale Oil Well 28th

Research on Cement Sheath Integrity Under High Temperature D...

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28th International Conference on Computational and Experimental engineering and Sciences, ICCES 2022

作者： Guo, Xueli Qi, Fengzhong Yu, Yongjin Jin, Jianzhou Guo, Yuchao Ji, Hongfei Cheng, Yongqin Zhao, Zhengyang CNPC Engineering Technology R&D Company Limited Beijing China Research Institute of Petroleum Exploration and Development Beijing China China University of Petroleum Beijing China

ISBN: (纸本)9783031020964

The temperature is as high as 500 °C at the bottom of shale oil wells during in-situ development. During shale oil production, the fluids with high temperature are transmitted to the wellhead, and the wellbore temperature will rise extremely, which greatly affects the cement sheath integrity. In this paper, the linear expansion coefficient of cement stone under the temperature of 500 ℃ were measured. Based on the experimental data and the field data of shale oil well, the stage finite element modeling method was adopted to establish a casing-cement-formation (CCF) model considering the temperature and pressure coupling. The results revealed that the linear expansion coefficient of cement stone decreases linearly with the increase of temperature. When the temperature was less than 250 ℃, the cement stone expanded. However, when the temperature exceeded 250 ℃, it shrank. The maximum shrinkage ratio can be 25 × 10–6/℃ for the temperature of 500 ℃. The circumferential stress of the inner wall of cement sheath first increased rapidly, then slowly decreased to be stable. The larger the cement stone shrink ratio was, the greater the circumferential stress was. The maximum circumferential stress can exceed 10 MPa for the shrink ratio of 25 × 10–6/℃. It can be concluded that the circumferential stress appears in a tensile state under high temperature conditions, which can easily lead to the failure of the cement sheath seal. The strength of the cement stone should be considered when designing the cement slurry property. In addition to the decay performance, the expansion of the cement stone should also be designed to ensure that the cement stone does not shrink when subjected to high temperature conditions. © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Cements

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Study On Shear & Tensile Activation Of Hydraulic Fracturing In Natural Fractured Reservoirs

Study On Shear & Tensile Activation Of Hydraulic Fracturing ...

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2023 SPE/IATMI Asia Pacific Oil and Gas Conference and Exhibition, APOG 2023

作者： Zhang, Yang Qiao, Yan Zhou, Fujian Ren, Dengfeng Liu, Yuzhang Bai, Jie China University of Petroleum Beijing China CNPC Engineering Technology R&D Company Limited China PetroChina Tarim Oilfield Company China Research Institute of Petroleum Exploration & Development China

ISBN: (纸本)9781613999813

The most fundamental purpose of reservoir stimulation is to maximize stimulation volume. For reservoirs developed with natural fractures, the maximization of fracture activation (tensile & shear activation) area should be pursued. Many scholars have studied the mechanical conditions of natural fractures activation, and used stress shadow to optimize cluster spacing. However, there is a lack of in-depth research on fracture propagation law, relationship between fracture activation and stress shadow, and factors affecting natural fracture activation. In this paper, numerical simulation methods are used to establish a true three-dimensional hydraulic fracturing model for reservoirs with natural fractures, and the quantitative evaluation indicators of stress shadow area and activation degree of natural fractures are formed. By studying the effects of different natural fracture properties, mechanical and engineering parameters on fracture propagation, stress shadow and natural fracture activation, the main controlling factors affecting fracture propagation and turning, the relationship between fracture activation and stress shadow, and changing rules of fracture activation are clarified. Finally, the fracture turning and accuracy of model are verified by microseismic monitoring data. Studies have shown that large-scale, high-density natural fractures, high net pressure, low in-situ stress difference, and moderate stress-fracture angle (30°~60°) can easily divert the propagation of hydraulic fractures instead of expanding in the horizontal maximum principal stress (Shmax) direction. Fracture tensile activation has a strong positive correlation with stress shadow area, that is, tensile activation leads to the increase of stress shadow area, while fracture shear activation has almost no correlation. Fracture tensile & shear activation area is in a competitive relationship, and shear fractures are dominant when the stressfracture angle is 45-60°, the in-situ stress differenc

关键词： Stresses

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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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research and Application of Digital Monitoring System for Pulse Current Cathodic Protection of Oil Pipeline

Research and Application of Digital Monitoring System for Pu...

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International Petroleum and Petrochemical technology Conference 2023, IPPTC 2023

作者： Gao, Bao-Yuan Li, Zhao-Hui Huan, Tan Drilling and Production Engineering Technology Research Institute CNPC Chuanqing Drilling Engineering Company Limited Sichuan China National Engineering Laboratory for Low-permeability Oil and Gas Field Exploration and Development Shaanxi China

The transportation of crude oil mainly relies on long-distance buried oil pipelines, which are generally made of steel pipes. Oil leakage often occurs due to corrosion, causing environmental pollution and unsafe accidents. A digital monitoring system for pulse current cathodic protection of oil pipelines was studied, with a focus on the composition and functions of the digital monitoring system for pulse current cathodic protection of oil pipelines. In 2022, the system was applied on two oil pipelines in Tongzhai operation area of the Third Oil Production Plant of Changqing oil field. The system realized the pulse current cathodic protection of oil pipelines to prevent corrosion. At the same time, it can digitally monitor the pulse current cathodic Conservation status status and adjust the working state of the potentiostat, and cooperate with the pulse current cathodic protection monitoring expert system for auxiliary analysis, which has received good economic and social benefits. © Published under licence by IOP Publishing Ltd.

关键词： Cathodic protection

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Analysis of the Reasons for Shutdown of Wells during the Stable Production Stage of Low-pressure and Low-permeability Gas Field development

Analysis of the Reasons for Shutdown of Wells during the Sta...

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International Petroleum and Petrochemical technology Conference 2023, IPPTC 2023

作者： Wei-Shi, Zheng Drilling and Production Engineering Technology Research Institute CNPC Chuanqing Drilling Engineering Company Limited Sichuan China National Engineering Laboratory for Low-permeability Oil and Gas Field Exploration and Development Shaanxi China

With the extension of the development time of the Sulige gas field, the stage of increasing reserves and production has entered a stable production stage. The number of shut down wells is increasing, and the impact on production is also increasing, which is extremely unfavorable for the stable production of the gas field. Therefore, strengthening the management of shut down wells is becoming increasingly important. This article collects, organizes, and analyzes data from 202 shut down wells in the central region of the Sulige gas field based on geological understanding of the reservoir, fluid composition, logging data, water gas ratio, and gas production profile testing. The results show that wellbore fluid accumulation and water lock damage, wellbore scaling, energy depletion, poor reservoir properties, and throttle failure are the main factors causing shut down wells, This provides an important reference basis for formulating production resumption measures and gas increase targets for shut down wells. © Published under licence by IOP Publishing Ltd.

关键词： Oil field equipment

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research and Application of Intelligent Water Source Well Air Defense Pumping and Dry Burning technology

Research and Application of Intelligent Water Source Well Ai...

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International Petroleum and Petrochemical technology Conference 2023, IPPTC 2023

作者： Gao, Bao-Yuan Li, Zhao-Hui Zheng, Wei-Shi Drilling and Production Engineering Technology Research Institute CNPC Chuanqing Drilling Engineering Company Limited Sichuan China National Engineering Laboratory for Low-permeability Oil and Gas Field Exploration and Development Shaanxi China

The surface water injection technology for developing low permeability reservoirs comes from the water supply of water source wells. The groundwater resources in oil fields are limited, with high water consumption and a decrease in water level, lacking effective monitoring methods. In recent years, there have been frequent occurrences of unsafe waste of electrical energy due to dry burning during pumping in water source wells, which has seriously affected the normal water injection of oilfield formations. In order to prevent dry burning of water source wells by pumping air, research on intelligent air defense dry burning technology for water source wells has been carried out. The automatic pump stop alarm at low water level and the automatic pump start at high water level avoid the phenomenon of dry burning during pumping in the water source well, ensure the normal operation of the water source well, and ensure sufficient water injection from the source. Reduce employee labor intensity and achieve the goal of optimizing human resources. Associate the start and stop status of the water source well with the tank position of the water injection station to achieve automatic water distribution and inventory, achieve digital management and fine management, and achieve the goal of reducing costs and increasing efficiency, which has promotion value. © Published under licence by IOP Publishing Ltd.

关键词： Surface waters

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Effect of Alternating Load on Sand Production of Gas Storage 12th

Effect of Alternating Load on Sand Production of Gas Storage

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12th International Field Exploration and development Conference, IFEDC 2022

作者： Zhang, Yu-Da Yuan, Guang-Jie Dong, Jing-Nan Xia, Yan Ban, Fan-Sheng Zang, Chun-Yang Research Institute of Petroleum Exploration and Development Beijing China CNPC Engineering Technology R&D Company Limited Beijing China College of Petroleum Engineering Liaoning Petrochemical University Liaoning China

ISBN: (纸本)9789819919635

Energy types are constantly changing due to the change of demand, and natural gas as a clean energy is gradually accepted by the world at present. In order to ensure the stable supply of natural gas, long-term, safe and effective means of peak regulation have emerged, and gas storage has developed rapidly in recent years. The injection and production condition of gas storage changes with the demand of gas peak adjustment. The formation pressure increases and the matrix stress decreases during gas injection. The formation pressure decreases and the matrix stress increases during gas recovery. Compared with production wells, injection and production wells of gas storage are more susceptible to shear stress and tensile stress under the action of alternating loads, so the phenomenon of sand production in gas storage is very common. In this paper, based on the sand production simulation device of gas storage, the influence of alternating load on sand production of gas storage is discussed through indoor experiment. In the experiment, the magnitude and times of applying alternating load are mainly changed to observe the sand production of core. The experimental results show that the core is more likely to produce sand under the action of alternating load, and the amount of sand produced gradually increases with the increase of the number of alternating load. Unconsolidated sandstones also produce sand when the alternating load is lower than the initial sand-producing pressure. The influence of alternating load on sand production of gas storage provides theoretical and experimental basis for sand production prediction and sand control completion method optimization. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2023.

关键词： Sand

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research and Application of Online Corrosion Monitoring System for Gas Pipelines 13th

Research and Application of Online Corrosion Monitoring Syst...

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13th International Field Exploration and development Conference, IFEDC 2023

作者： Gao, Bao-Yuan Li, Zhao-Hui Gao, Shi-Hui Drilling and Production Engineering Technology Research Institute CNPC Chuanqing Drilling Engineering Company Limited Chengdu China National Engineering Laboratory for Low-Permeability Oil and Gas Field Exploration and Development Xian China Oil and Gas Technology Research Institute of PetroChina Changqing Oil Field Branch Xian China

ISBN: (纸本)9789819702596

The corrosion damage of natural gas pipelines will seriously reduce the structural strength, load-bearing capacity, and reliability of pipelines, shorten their service life, and increase operational risks. In response to the current situation of natural gas pipeline corrosion, conventional manual testing can no longer meet on-site needs. The current online monitoring technologies for natural gas pipelines have limitations, such as excavation and testing of the remaining wall thickness of natural gas pipelines, which will inevitably have a certain negative impact on the pipeline in addition to high costs. A natural gas pipeline corrosion online monitoring system has been developed, and the article introduces the composition of the online monitoring system Calculation and online monitoring steps for corrosion measurement. The corrosion data collector analyzes and processes the corrosion signals of natural gas pipelines, uploads them to the remote control center, and after processing by the monitoring system, obtains accurate corrosion data and calculates the corrosion situation, determines the corrosion status of natural gas pipelines, locates the anti-corrosion layer, evaluates the aging status of the corrosion layer, identifies the operating parameters of natural gas pipelines, guides the selection and use of corrosion inhibitors, and adjusts the injection of corrosion inhibitors, Guide the implementation plan of forced impressed current cathodic protection for natural gas pipelines, and conduct online parameter warning through remote monitoring of SCADA system. This system has the characteristics of fast, accurate, and highly automated detection of corrosion resistance, effectively controlling the corrosion of natural gas pipelines. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Gases

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Application of Digital Rock technology in Carbonate Tight Gas development 12th

Application of Digital Rock Technology in Carbonate Tight Ga...

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12th International Field Exploration and development Conference, IFEDC 2022

作者： Qi, Chun-Yan Zhang, Les-Lie Li, Jia-Ying Deng, Hui Gu, Ye Yan, You-Jun CNPC Engineering Technology R & D Company Limited Beijing China CNPCUSACorporation HoustonTX United States Exploration and Development Research Institution PetroChina Southwest Oil and Gas Field Company Sichuan Chengdu China

ISBN: (纸本)9789819919635

With the continuous development of unconventional oil resources such as tight oil and gas in China, it is becoming increasingly more important to understand the microscopic characteristics and flow mechanism of tight oil and gas reservoirs through lab studies. It is both time consuming and costly to perform core flow tests in the very low permeability rock samples for field development. This paper described the application of high-resolution digital rock technology performed in North America in the microscopic description and flow mechanism study of the Dengsi carbonate tight gas formation in the central Sichuan area. The study mainly includes: (1) The design and application of multi-scale, multi-resolution different imaging techniques to re-construct a full-diameter digital rock model to realize the three-dimensional characterization of the microscopic pores, vugs and fractures distribution of different reservoir types in the tight matrix;(2) Constructing digital rock models of different resolution and digital fluid models based on field sample and data;(3) Characterizing the permeability and porosity of digital rock models of different resolution and benchmarked against lab measurements to determine the best combination of imaging techniques;(4) Simulation of gas-water relative permeability and recovery from primary depletion at reservoir conditions. Comparing the digital core analysis with experimental results shows that the digital rock technology can be used for the evaluation of tight gas formations and flow mechanisms with high resolution, low cost, and much reduced time. Digital rock models can also be reused which most time is not possible in the lab. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2023.

关键词： Tight gas

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