| 页岩油藏多段水平井压后关井阶段压力扩散数学模型研究 |
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| 引用本文： | 赵振峰.页岩油藏多段水平井压后关井阶段压力扩散数学模型研究[J].地质与勘探,2022,58(3):686-695. |
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| 作者姓名： | 赵振峰 |
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| 作者单位： | 中国石油长庆油田分公司油气工艺研究院,低渗透油气田勘探开发国家实验室,陕西西安 710018,中国地质大学(北京),非常规天然气地质评价与开发工程北京市重点实验室,北京 100083 |
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| 基金项目： | 国家科技重大专项项目《致密油富集规律与勘探开发关键技术》课题四“致密油储层高效体积改造技术”（ 编号: 2016ZX05046-04）资助 |
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| 摘 要： | 多段多簇水平井压裂技术作为页岩油藏的重要开发手段已经得到了广泛认同，压后关井能充分发挥渗吸的作用，提高单井压后产量，但目前压裂液渗吸作用区域一直是困扰油藏工程师的重要难题。本文以陇东页岩油藏多段压裂井为研究对象，基于物质平衡原理，利用渗流力学和岩石力学理论，建立了压裂施工过程中和压后关井过程中流体压力扩散数学模型，研究了压力扩散和压裂液波及体积随时间的变化关系。结果表明：压裂液波及体积随关井时间的增加逐渐增加，但增加的幅度会逐渐降低。储层渗透率越小，孔隙度越大，压裂施工时间越长，关井阶段井底压力越高，地层能量越高。该结果可为页岩油藏最佳关井时间的确定提供理论支持。
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| 关 键 词： | 页岩油藏 水平井压裂 压力扩散 压后关井 数学模型 陇东页岩油藏 |
| 收稿时间： | 2020/11/27 0:00:00 |
| 修稿时间： | 2021/8/10 0:00:00 |
Pressure diffusion at the shut-in stage of multi-section horizontal wells in shale oil reservoirs |
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| Zhao Zhenfeng.Pressure diffusion at the shut-in stage of multi-section horizontal wells in shale oil reservoirs[J].Geology and Prospecting,2022,58(3):686-695. |
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| Authors: | Zhao Zhenfeng |
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| Institution: | Oil & Gas Technology Research Institute Petro China Changqing Oilfield Company, State Engineering Laboratory of Low-permeability Oil & Gas Field Exploration and Development, Xi''an,Shaanxi; School of Energy Resources, China University of Geosciences( Beijing), Beijing Key Laboratory of Unconventional Natural Gas Geology Evaluation and Development Engineering, Beijing |
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| Abstract: | The multi-stage and multi-cluster horizontal well fracturing technology has been widely recognized as a vital development method for shale oil reservoirs. In this method, shut-in after fracturing can fully make full use of imbibition and increase the output of a single well after fracturing. The area of fracturing fluid imbibition remains, however, a major difficult problem puzzling reservoir engineers. This paper takes multi-stage fracturing wells in Longdong shale oil reservoirs as the research object to address this issue. Based on the principle of material balance, using seepage and rock mechanics theories, a mathematical model of fluid pressure diffusion during fracturing and shut-in after fracturing is established, and the relationship between pressure diffusion and the swept volume of fracturing fluid over time is studied. The results show that the swept volume of fracturing fluid increases gradually with the growth of shut-in time, while the increase amplitude can gradually decrease. The lower the reservoir permeability, or the greater the porosity, or the longer the fracturing construction time, the higher the bottom hole pressure during the shut-in stage, and formation energy becoming higher. This result provides a theoretical support for determining the optimal shut-in time for shale oil reservoirs. |
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| Keywords: | shale oil reservoir horizontal well fracturing pressure diffusion shut-in after fracturing mathematical model Longdong shale oil reservoirs |
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