页岩水平井水力压裂裂缝扩展及防窜三维地质模拟

doi:10.7657/XJPG20230611

摘要/Abstract

摘要：

四川盆地页岩气水平井大多通过大段多簇细分切割技术进行压裂改造，由于大排量和大规模施工以及加密井完钻，井间干扰严重，导致页岩气井产能降低。优化增产措施和完井策略，明确水力压裂裂缝扩展规律，对降低井间压窜风险尤为重要。利用三维地质力学模型，在考虑储集层非均质性、地应力各向异性、裂缝间相互作用以及缝网分布的情况下，进行了相邻2口水平井的水力压裂裂缝扩展和防窜模拟。研究结果表明，水平应力差、天然裂缝密度和用液强度较大，逼近角和簇间距较小，均会导致较大的压窜风险。

关键词: 四川盆地, 页岩气, 三维地质力学模型, 裂缝扩展, 数值模拟, 水平井, 压窜, 井间干扰, 水力压裂

Abstract:

In the Sichuan basin, most of horizontal shale gas wells are stimulated by subdivided fracturing with large-stage and multi-cluster. Large-scale operations at high displacement and well infilling are often associated with severe inter-well interferences, leading to a decrease in well productivity. Optimizing stimulation treatments and well completion strategies and understanding the hydraulic fracture propagation rules are crucial to reducing the risk of inter-well frac-hit. Based on a 3D geomechanical model and with consideration to reservoir heterogeneity, in-situ stress anisotropy, interaction between fractures, and fracture network distribution, hydraulic fracture propagation and frac-hit prevention were simulated for two adjacent horizontal wells. The results show that large horizontal stress difference, natural fracture density and fluid intensity, or small approach angle and cluster spacing, may induce a high risk of frac-hit.

Key words: Sichuan basin, shale gas, 3D geomechanical model, fracture propagation, numerical simulation, horizontal well, frac-hit, inter-well interference, hydraulic fracturing

中图分类号:

TE357

王挺, 汪杰, 江厚顺, 续化蕾, 姚自义, 南冲. 页岩水平井水力压裂裂缝扩展及防窜三维地质模拟[J]. 新疆石油地质, 2023, 44(6): 720-728.

WANG Ting, WANG Jie, JIANG Houshun, XU Hualei, YAO Ziyi, NAN Chong. 3D Geological Simulation of Hydraulic Fracture Propagation and Frac-Hit Prevention in Horizontal Shale Gas Wells[J]. Xinjiang Petroleum Geology, 2023, 44(6): 720-728.

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水平应力差/MPa	A井		B井		相接裂缝半长/m
水平应力差/MPa	所在段	所在簇	所在段	所在簇	相接裂缝半长/m
0	1	3	1	4	320
0	5	2	6	1	321
7	1	3	2	1	451
7	2	4	3	3	456
15	3	4	4	2	564
15	4	4	5	3	568