玛湖凹陷风城组页岩油藏水平井压裂裂缝扩展模拟

doi:10.7657/XJPG20220613

摘要/Abstract

摘要：

水力压裂是玛湖凹陷二叠系风城组页岩油藏有效的开发手段，但压裂裂缝扩展特征不明确。针对该区水平井压裂起裂难和加砂难的问题，亟需开展水力压裂模拟，明确天然裂缝、岩石力学性质和施工参数对压裂效果的影响。依据玛页1H井实际泵压、压裂液排量、加砂量等压裂施工参数，采用Abaqus软件和Petrel软件建立二维压裂裂缝扩展模型和三维水力压裂模型，开展压裂裂缝扩展数值模拟。结果表明，压裂改造效果与天然裂缝关系密切，天然裂缝发育处岩石抗拉强度越小，压裂裂缝越易被天然裂缝捕获；当压裂段内杨氏模量较大时，形成的压裂裂缝缝宽小，且多沿着天然裂缝走向扩展滑移，加砂难度大；当压裂段内杨氏模量较小时，形成的压裂裂缝缝宽较大，可直接穿过天然裂缝，加砂相对容易。

关键词: 玛湖凹陷, 风城组, 页岩油藏, 水平井, 压裂裂缝, 裂缝扩展, 数值模拟

Abstract:

Hydraulic fracturing is an effective method for developing the shale reservoirs in the Permian Fengcheng formation in the Mahu sag，but the propagation characteristics of hydraulic fractures are unclear. Maye-1H，a typical horizontal well in this area，suffered from difficulties in fracturing initiation and sand addition. Thus，it is urgent to carry out hydraulic fracturing simulation to clarify the impacts of natural fractures，rock mechanical properties，and operation parameters on fracturing effect. According to the actual operation parameters such as pump pressure，fracturing fluid displacement and added sand volume in Well Maye-1H，a 2D hydraulic fracture propagation model and a 3D hydraulic fracturing model were established by using Abaqus software and Petrel software，and then numerical simulation on hydraulic fracture propagation was performed. The results show that the fracturing effect is closely related to natural fractures. The lower the tensile strength of the rock where natural fractures are developed，the easier the hydraulic fractures tend to be captured by the natural fractures. When the Young’s modulus in the fractured interval is relatively large，the hydraulic fractures formed are small in width，and most of them propagate and slip along the natural fracture trend，making it difficult to add sand. When the Young’s modulus in the fractured interval is relatively small，the hydraulic fractures formed are large in width，and they can directly pass through the natural fractures，making sand adding relatively easy.

Key words: Mahu sag, Fengcheng formation, shale reservoir, horizontal well, hydraulic fracture, fracture propagation, numerical simulation

中图分类号:

TE357

余佩蓉, 郑国庆, 孙福泰, 王振林. 玛湖凹陷风城组页岩油藏水平井压裂裂缝扩展模拟[J]. 新疆石油地质, 2022, 43(6): 750-756.

YU Peirong, ZHENG Guoqing, SUN Futai, WANG Zhenlin. Simulation on Fracture Propagation During Hydraulic Fracturing in Horizontal Wells in Shale Reservoirs of Fengcheng Formation，Mahu Sag[J]. Xinjiang Petroleum Geology, 2022, 43(6): 750-756.

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