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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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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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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 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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Experimental study on the evolution law of breakthrough pressure of mudstone cap under alternating load 57

Experimental study on the evolution law of breakthrough pres...

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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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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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A New Magnetic Ranging technology Achieves the Accuracy and Operational Flexibility Needed for Plugging Complex Old Wells of Underground Gas Storage 12th

A New Magnetic Ranging Technology Achieves the Accuracy and ...

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12th International Field Exploration and development Conference, IFEdC 2022

作者： Che, Yang Qiao, Lei Yuan, Guang-Jie Lin, Sheng-Jie du, Wei-Qiang Wang, Chen-Long Zhu, Xiao-Yu CNPC Engineering Technology R&D Company Limited Beijing China National Engineering Research Center for Oil & Gas Drilling and Completion Technology Beijing China North East Petroleum University Daqing China

ISBN: (纸本)9789819919635

Using depleted gas fields to store natural gas is one of the most common underground gas storage (UGS) all over the world. However, many abandoned wells with complex conditions such as downhole fishes or broken casings affect the sealing property of UGS. Thus, it is essential to plug these wells that minimize the risk of leakage. But traditional inclinometer technology is challenging to meet the measurement accuracy due to the cumulative error. A new method based on magnetic ranging technology has been developed and successfully applied in the UGS project to overcome the problem of plugging complex wells. The main technical idea is to drill a new well called relief well around the target well. Then, the electromagnetic wave is excited to the formation, and the magnetic signal generated by the electromagnetic wave will be gathered in the target well at the same time. due to the different conductivity, most of the signals will gather along the ferromagnetic string of the target well. Next, the array gradiometer of the magnetic ranging tool will receive the corresponding magnetic signals. Through accurate calculation, the relative position (distance and direction) between the two wells is given. According to the relative position measurement, the BHA (Bottom Hole Assembly) is used to drill forward repeatedly until the new well connects to the target well completely. Meanwhile, error model and geology-engineering integration are also considered to obtain the target spot and its TVd (true vertical depth). The magnetic ranging technology has several advantages, including lower cost and lower risk for the operator. Theoretically, various laboratory tests were conducted to demonstrate the ability to provide reliable and accurate ranging data for relatively good positioning. Practically, the paper presents field trials exclusively with three typical complex wells of UGS to validate the proposed concept. The results of laboratory tests show excellent agreement on position mea

关键词： Gas industry

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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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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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research and Application of Multilevel Wellbore Quality Quantification Method Based on Random Forest Algorithm 13th

Research and Application of Multilevel Wellbore Quality Quan...

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13th International Field Exploration and development Conference, IFEdC 2023

作者： Xiao, Yue Zhou, Tuo Li, Hangyuan Kong, Xiangji Song, Lu diao, Shunong Liu, Jitong Zhong, Zhao Jin, Yulai Li, Bingrou CNPC Engineering Technology R&D Company Limited Beijing102206 China China National Oil and Gas Exploration and Development Corporation Beijing China National Engineering Research Center for Oil and Gas Drilling and Completion Technology Beijing China College of Petroleum Engineering Beijing China

ISBN: (纸本)9789819702558

The quality of drilling wellbore is crucial for oilfield companies to evaluate the construction acceptance of drilling operations, evaluate the wellbore quality before cementing operations, and smoothly implement subsequent casing and electrical logging tools. At present, the evaluation of wellbore quality only requires dispersed trajectory parameters of different well sections (well inclination angle, dog leg angle, target range), and only considers whether the trajectory parameters are within the qualified range during completion acceptance. A quantitative scoring method for wellbore quality has not yet been developed, which is not conducive to the evaluation of well quality by oilfield enterprises during drilling completion acceptance. In this paper, the key parameters such as deviation measurement interval, dogleg degree, maximum deviation and target hit are comprehensively considered. Based on the comprehensive method of mathematical statistics and Matlab programming calculation, a multi-level quantitative scoring model of well bore quality is established. The key parameters in the multi-level quantitative model of well bore quality are determined by using the main control factor analysis method of random forest algorithm. Taking the A oil field as an example, a quantitative scoring was conducted on the quality of 74 drilled wells in 2021 to evaluate the effectiveness of the operation team in controlling well quality. The analysis results showed that for the A oil field, the importance of factors affecting well quality was as follows: maximum inclination > Target radius > dog leg = survey interval. Crew 1 had better control over well quality, and the proportion of high-quality wells in 2021 decreased compared to 2020, The analysis results of the multi-level well bore quality quantification method based on random forest algorithm proposed in this paper are in line with the field work practice, which provides a theoretical basis for well bore quality quantificati

关键词： MATLAB

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