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Tubing Depth Optimization Study of Horizontal Well Drainage and Gas Production in WeiYuan Shale Gas Field 12

Tubing Depth Optimization Study of Horizontal Well Drainage ...

2022 International Conference on Acoustics, Fluid Mechanics and engineering, AFME 2022 and the 12th Green''s Function Seminar, GFS 2022

作者： Che, Mingguang Liu, Jie Bu, Chengzhong Dong, Kai Research Institute of Petroleum Exploration and Development PetroChina Beijing China Yangtze University Hubei Wuhan China Cnpc Chuanqing Drilling Engineering Company Limited Chengdu Sichuan China Cnpc Great Wall Drilling Engineering Company Limited Beijing China

Timely production with a tube in shale gas wells can effectively ensure the stable decline of gas wells. However, there is no in-depth study on which position of tubing is the most favorable for the stable production of gas wells and whether the wellbore trajectory has an impact on this position. To determine the reasonable end of tubing (EOT), firstly, through the gas water flow experiment of the whole wellbore test device of a horizontal well, the characteristics of liquid accumulation in the test section and the liquid discharge at the outlet are analyzed. The results show, when the horizontal section inclines upward and the end of the tubing reaches 1/3 of the horizontal section, the gas flow carrying liquid is the smallest. Then, OLGA software is used to simulate the wellbore effusion in the production process of gas wells with different tubing depths under different wellbore trajectories. The results show when the horizontal section inclines upward and the end of the tubing arrives at 1/3 of the horizontal section, the cumulative production of the gas well is the largest. Based on comprehensive analysis, it is most favorable for horizontal shale gas wells when the end of the tubing is about 1/3 of the horizontal section. © Published under licence by IOP Publishing Ltd.

关键词： Shale gas

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Vibration condition analysis based on surface-underground engineering measurement parameters 7

Vibration condition analysis based on surface-underground en...

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7th International Conference on Downhole Measurement and Control, ICDMC 2024

作者： Fan, Jinchao Fang, Chao Xu, Zhaohui Lin, Zili CNPC Engineering Technology R&D Company Limited Beijing102206 China National Engineering Research Center of Oil & Gas Drilling and Completion Technology Beijing102206 China

Accurate identification of abnormal vibration conditions is an important guarantee for drilling safety. In the process of deep oil and gas and unconventional oil and gas production, only the surface parameters can not effectively identify the abnormal vibration conditions in the drilling process. It is an important method to accurately identify abnormal vibration conditions to obtain the engineering parameters near the bit by using downhole parameter measurement tools and analyze the data combined with the surface logging data. To solve the above problems, this paper firstly studies the storage downhole parameter measurement tool, which can obtain the parameters of weight on bit, speed, torque, temperature, pressure and acceleration near the bit position. Finally, field tests are carried out, and the experimental results show that the tool can effectively obtain engineering parameters near the bit position, and can effectively identify abnormal downhole vibration conditions based on surface-downhole parameters, which can provide strong support for drilling operations. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Infill drilling

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Intelligent Prediction and Key Factor Analysis to Lost Circulation from Drilling data based on Machine Learning

Intelligent Prediction and Key Factor Analysis to Lost Circu...

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2022 International Conference on Computer Graphics, Artificial Intelligence, and Data Processing, ICCAID 2022

作者： Wen, Guangyao Chen, Huailong Zhou, Tuo Gao, Chengwu Baletabieke, Bahedaer Zhou, Haiqiu Wang, Shan CNPC Amu Darya River Gas Exploration & Development Company Beijing102299 China CNPC Engineering Technology R&D Company Limited Beijing102206 China Beijing Chen Yu Jin Yuan Science and Technology Company Limited Beijing100010 China

ISBN: (纸本)9781510663350

Lost circulation during drilling wells is very detrimental since it greatly increases the non-productive time and operational cost, also seriously lead to wellbore instability, pipe sticking, blow out, etc... However, in the process of drilling wells, geological characteristics and operational drilling parameters all may have impacts to the lost circulation. This makes the establishment of the relations between the lost circulation and drilling factors very challenging. In this paper, we tested five different kernel function (linear, quadratic, cubic, medium Gaussian and fine Gaussian) derived support vector regression (SVR) models and four-layer artificial neural network (ANN). By combining their accuracy and time efficiency, the ANN is regarded as the optimal predictor of lost circulation. By training ANN using different combination of drilling features, we concluded that depth, torque, hanging weight, displacement, entrance density and export density are the key factors to accurate predict the lost circulation. The corresponding trained ANN network can achieve 99.2% accuracy and evaluate whether a drilling feature vector corresponds to lost circulation or not in milliseconds. © 2023 SPIE.

关键词： Multilayer neural networks

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Rock cutting image recognition based on color and texture feature fusion 7

Rock cutting image recognition based on color and texture fe...

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7th International Conference on Downhole Measurement and Control, ICDMC 2024

作者： Zhang, Yihao Li, Zhongbing Han, Xiong Southwest Petroleum University School of Electrical Engineering and Information Chengdu610500 China CNPC Chuangqing Drilling Engineering Company Limited Technology of Drilling and Production Engineering Research Institute China

In the realm of oil exploration, there is an increasing demand for precise lithological analysis, particularly in the rapid and accurate identification of fine rock cutting images. Therefore, a novel rock cutting image recognition method based on the fusion of color and texture features is proposed. This method utilizes the color histogram and grayscale co-occurrence matrix techniques to extract color and texture features from target images, respectively. Compared with the traditional single-feature recognition methods, this integrated feature method can greatly improve the accuracy of fragment recognition and ensure more accurate fragment classification by designing the feature fusion structure of the fragment image feature set. The model is established by using the support vector machine (SVM) classifier to realize the automatic classification and recognition of cuttings images. This not only reduces the time and labor intensity of manual operation, but also improves the efficiency and speed of cuttings analysis, which meets the needs of modern efficient drilling operations. More detailed and accurate stratigraphic data can be provided by high precision rock chip identification and lithology analysis. These data have important reference value for geologists to analyze stratigraphic structure and distribution, determine the location and distribution of underground oil and gas layers, and optimize drilling decisions and operation plans. Experimental results show that the method achieves an overall recognition accuracy of more than 90% in the task of detecting 126 rock chip images for conglomerate, 153 for mudstone, and 150 for sandstone, and up to 94% for mudstone and sandstone. It is proved that the recognition method proposed in this paper can better classify sandstone, mudstone and conglomerate in rock chips with high recognition accuracy. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Sandstone

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Modelling Thermal Geomechanical Effects on Heat Transfer Ahead of a Steam Chamber and Production During Sagd

SSRN

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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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Experimental research Regarding the Flow Pattern and Pressure Drop in a Slurry Composed of Polypropylene-Particles 9

Experimental Research Regarding the Flow Pattern and Pressur...

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9th International Conference on Advances in Machinery, Materials Science and engineering Applications, MMSE 2023

作者： Fan, Jinchao Xu, Zhaohui Fang, Chao Lin, Zili Cnpc Engineering Technology R&d Company Limited China National Engineering Research Center for Oil and Gas Drilling and Completion Technology China

ISBN: (纸本)9781643684383

Pipelines used for product transportation require regular cleaning. A new method has emerged using slurry for the cleaning process, during which the flow pattern and pressure drop in the slurry are essential. The flow of slurry containing polypropylene particles was investigated using a laboratory-scale, closed-circuit pipeline facility. While the slurry was pumped, the pressure drop was measured, and the flow pattern was observed regarding particle type, slurry particle concentration, and slurry flow velocity. The results showed that after the critical flow velocity, the particles mixed uniformly with the water in the pipe, increasing the pressure drop in conjunction with the flow velocity. Although a higher particle mass fraction and small particle size reduced the critical flow velocity, the mass fraction and particle size had no significant influence on the pressure drop. This research establishes a solid foundation for the practical application of this cleaning method. © 2023 The Authors.

关键词： Flow patterns

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Discussion on the Method of Carbon Emission Accounting in China’s Oil and Gas Production Process 12th

Discussion on the Method of Carbon Emission Accounting in Ch...

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12th International Field Exploration and development Conference, IFEDC 2022

作者： Kang, Jing-Cheng Li, Xin-Yu Luo, Bei-Wei Yang, Pei-Guang Chen, Hua PetroChina Research Institute of Petroleum Exploration and Development Beijing100083 China CNPC Bohai Drilling Engineering Company Limited Langfang065007 China

ISBN: (纸本)9789819919635

China has formulated a clear carbon emission reduction target, for which all industries need to formulate a standardized carbon emission account¬ing system. However, most of the related researches in the field of oil production are aimed at the whole oil industry system. There is a lack of carbon emission accounting research applicable to each oil and gas production unit starting from the specific oil and gas production process. This paper analyzes the principle of the cur¬rent general carbon emission accounting technology, and summarizes the carbon emission accounting specifications for the petroleum system. Based on the Green¬house Gas Emissions Accounting Method Guidelines issued by China’s National development and Reform Commission as a standard, the process of actual carbon emission accounting for specific oil and gas production units is simulated. And studies the problems existing in the actual carbon emission accounting. Through the research, it is concluded that: 1, At present, the carbon emission accounting method used in oil and gas production is improved from the census method, and the theory is formulated with clear specifications, but there are certain problems in the actual implementation.2,The oil and gas industry lacks accurate carbon emission factor parameters, and a case study of the full-process carbon emission accounting of typical projects should be carried out. 3, Most of the current publicly available data are calculated from old oil and gas production parameters, which most likely exaggerate the carbon emissions of China’s oil and gas industry. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2023.

关键词： Specifications

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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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Fracture Geometries and Breakdown Pressures of Multi-Branch Radial Borehole Fracturing Influenced by Horizontal Stress Difference 57

Fracture Geometries and Breakdown Pressures of Multi-Branch ...

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57th US Rock Mechanics/Geomechanics Symposium

作者： Yong, Yuning Guo, Zhaoquan Tian, Shouceng Wang, Tianyu Sheng, Mao Liao, Lulu Beijing China Beijing Petroleum Machinery Company Limited CNPC Engineering Technology R&D Company Limited Beijing China Sinopec Research Institute of Petroleum Engineering Beijing China

ISBN: (纸本)9780979497582

Multi-branch radial boreholes can be drilled and combined with hydraulic fracturing to efficiently stimulate tight gas reservoirs. This paper experimentally investigates how horizontal stress difference affects fracture geometry and breakdown pressure in multi-branch radial borehole fracturing by a true triaxial fracturing device. Six artificial rocks (395 mm ×395 mm ×395 mm) were cast for the experiments, which are divided into two groups by the azimuth of the radial borehole. The results show that fracture geometries are controlled by the rectification of a single radial borehole, the extrusion between the adjacent radial borehole row, and the deflection of the maximum horizontal stress. Fracture propagation is affected by the dynamic variation of the three effects. Decreasing the stress difference is favorable for fracture propagation along the radial borehole axis, while it lifts the breakdown pressure. Decreasing the azimuth lifts fracture extension distance parallel to the radial borehole axis and reduces the breakdown pressure. This research sheds light on the feasibility of radial borehole fracturing for reservoirs under various stress differences. © 2023 57th US Rock Mechanics/Geomechanics Symposium. All Rights Reserved.

关键词： Boreholes

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Key Safe Drilling technology and Application of Highly Deviated Well for High-Pressure Gas Reservoirs in Western the Right Bank of the Amu Darya River 13th

Key Safe Drilling Technology and Application of Highly Devia...

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13th International Field Exploration and development Conference, IFEDC 2023

作者： Li, Gan-Lu Zhong, Zhao Liu, Ji-Tong Cheng, Wei-Heng Ye, Dong-Qing Zhou, Hai-Qiu Zhang, Wei Xiao, Yue CNPC Engineering Technology R&D Company Limited Beijing China National Engineering Research Center of Oil & Gas Drilling and Completion Technology Beijing China AM River Natural Gas Company Beijing China

ISBN: (纸本)9789819702558

The west of Amu Darya Right Bank has complex geologic conditions and active shallow groundwater. The middlesalt-gypsum layers of Kemalian stage contain lenticular high-pressure saline aquifer, and the lower Kalov-Oxfordian reservoir develops high-pressure gas layer and high sulfur content. Complexities such as water invasion, gas kick, wellbore instability and leakage are prone to occur during drilling. The integrated application of suitable characteristic technologies such as wellbore structure optimization technology, strong inhibitive anti-sloughing drilling fluid technology and creep-resistant salt layer drilling fluid technology has effectively solved the problem of safe drilling of highly deviated wells in high-pressure gas reservoirs. This paper focuses on the optimization design of wellbore structure, drilling fluid technology for salt gypsum layer and safe drilling technology for salt gypsum layer. The subject ideas of several technologies in this paper are based on the properties of salt-gypsum layer and wellbore stability. This paper optimizes the seal-point, forms the three-section drilling program. The strong inhibition and anti-collapse drilling fluid system for upper layer and the polysulfonate under saturated-saturated brine drilling fluid system for salt-gypsum layer, and the salt-gypsum layer safe drilling technology are optimized. The integrated application of the above technologies reduces the occurrence of serious drilling fluid leakage, casing collapse and other complexities. The salt-gypsum layers are successfully drilled, and the cementing quality is guaranteed, the risks of safe drilling of highly deviated wells for high-pressure gas reservoirs in this area are effectively reduced, which provides reference for similar reservoirs. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Aquifers

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