Optimization of multi-stage cluster spacing in deep coal seam horizontal wells considering cleat
CHE Hengda
HUANG Hao
CHEN Mingzhong
KONG Xiangwei
GUO Lianglin
ZHANG Hao
Abstract：In order to study the horizontal well multi-segment multi-cluster fracture extension in the deep coal reservoir where the cleat fissures are developed,a multi-segment multi-cluster fracture extension model is created based on the extended finite element and taking into account the inter-seam interference and the induced stress field.With the secondary development of pre-processing in Python language,a large number of approximately orthogonal cleat fissures were added into the model.The effects of cluster spa-cing,fracturing sequence and segment spacing on multi-fracture extension were analyzed,and the advantages and disadvantages of fracturing effect were verified by querying the number of fracture-communicating cutting groups.The simulation results show that when the cluster spacing is 20 m and the segment spacing is 40-45 m,the number of fracture communication cutting groups is relat-ively high,and the fracture length is optimal due to the small influence of inter-seam interference and induced stress field;at the as-pect of the influence of different fracturing sequences on the extension of multi-fractures,the fracturing effects are ranked from ex-cellent to poor:sequential fracturing>alternating fracturing>synchronous fracturing.The results of modeling and field application are in good agreement,with 96.5%for the second fracturing section and 93.4%for the third fracturing section.
Keywords：deep coal-rock reservoirsegmented cluster fracturingcleat fissureinduced stressextended finite element
Publication Date：2024-11-20
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 69-76 )