3D Geological Simulation of Hydraulic Fracture Propagation and Frac-Hit Prevention in Horizontal Shale Gas Wells

doi:10.7657/XJPG20230611

Abstract

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

CLC Number:

TE357

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.

Figures/Tables 10

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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