| 基于连续损伤的水平井射孔-近井筒三维破裂模拟 |
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| 引用本文： | 孙峰,薛世峰,逄铭玉,唐梅荣,张翔,李川.基于连续损伤的水平井射孔-近井筒三维破裂模拟[J].岩土力学,2019,40(8):3255-3261. |
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| 作者姓名： | 孙峰 薛世峰 逄铭玉 唐梅荣 张翔 李川 |
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| 作者单位： | 1. 中国石油大学（华东） 储运与建筑工程学院，山东 青岛 266580；
2. 中国石油长庆油田油气工艺研究院，陕西 西安 710021 |
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| 基金项目： | 国家自然科学基金（No. 51304230）；中央高校基本科研业务费专项（No. 16CX05001A）；国家留学基金委项目（No. 201706455025）。 |
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| 摘 要： | 射孔作为井筒与储层之间的液流通道，是水力压裂过程中的重要可控性参数。为研究水平井射孔-近井筒破裂机制，采用岩层变形-流体渗流方程描述应力状态变化，应用连续损伤破裂单元表征三维破裂位置与形态演化，并开发有限元求解程序模拟分析了射孔对水平井初始破裂压力、破裂位置及近井筒裂缝复杂性的调控作用。通过与解析模型及射孔压裂物理模型试验结果对比，验证了模型及有限元程序的有效性；水平井破裂压力数值分析结果与现场测试数据吻合较好。研究表明：射孔可调控水平井破裂压力与初始破裂位置，同时对近井筒区域裂缝扩展形态影响显著。通过优化射孔参数可以引导初始破裂向最优破裂面扩展、有效降低破裂压力，减小由于螺旋射孔空间排布引起的水平井近井筒裂缝迂曲与复杂程度，提高致密油气藏压裂改造效果。
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| 关 键 词： | 连续损伤 水平井 射孔参数 近井筒破裂形态 数值模拟 |
| 收稿时间： | 2018-05-17 |
3D simulation of fracture growth from perforation to near-wellbore in horizontal wells based on continuum damage model |
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| SUN Feng,XUE Shi-feng,PANG Ming-yu,TANG Mei-rong,ZHANG Xiang,LI Chuan.3D simulation of fracture growth from perforation to near-wellbore in horizontal wells based on continuum damage model[J].Rock and Soil Mechanics,2019,40(8):3255-3261. |
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| Authors: | SUN Feng XUE Shi-feng PANG Ming-yu TANG Mei-rong ZHANG Xiang LI Chuan |
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| Institution: | 1. College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao, Shandong 266580, China;
2. Oil and Gas Technology Research Institute, PetroChina Changqing Oilfield Company, Xi’an, Shaanxi 710021, China |
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| Abstract: | Perforation provides fluid conduit between wellbore and reservoir, hence it is an important controllable parameter for hydraulic fracturing stimulations. Focusing on the mechanism of fracture growth from perforation to near-wellbore in horizontal wells, a hydro-mechanical coupling model was used to analyze the stress change, together with continuum-based damage elements to characterize the three-dimensional fracture propagation and geometry evolution. A finite element program was developed to investigate the effects of perforation on fracture initiation pressure, failure location and near-wellbore fracturing complexity. The model was validated against the results of analytical model and perforation fracture experiments. The simulation results of horizontal well fracture initiation pressure were coincided well with the records of field test. The results indicate that: perforation can be used to control the fracturing pressure and propagation behavior of the initial fracture, which has a further effect on the fracture geometry of near-wellbore region in horizontal wells. Optimizing perforation parameters can lead initial fracture extend toward the preferred fracture plane. The results could help to decrease the fracture pressure, reduce the tortuosity and complexity of near-wellbore fracture caused by the helical perforations, and improve the fracturing stimulation effects of tight oil and gas reservoirs. |
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| Keywords: | continuum damage horizontal well perforation parameters near-wellbore fracture geometry numerical simulation |
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