煤田地质与勘探2025，Vol.53Issue(4)：86-93,8.DOI:10.12363/issn.1001-1986.24.11.0746
深层煤系气水平井多簇射孔分段压裂参数优化
Parameter optimization for multistage horizontal well fracturing based on multi-cluster perforation for deep coal measure gas:A case study of the Jurassic Baijiahai area in the Junggar Basin
摘要
Abstract
[Objective]The multistage horizontal well fracturing based on multi-cluster perforation has emerged as an ef-fective approach for the efficient production of deep coal-measure gas(CMG).However,deep coals feature unique rock mechanical properties,fluid loss characteristics of reservoirs,and microfracture developmental characteristics,which differ significantly from those of unconventional shales,tight sandstones,and shallow coals.As a result,existing fractur-ing experience cannot be directly applied,highlighting the investigation of fracturing parameter optimization tailored for deep CMG production.[Methods]Focusing on deep CMG reservoirs in the Baijiahai area within the Junggar Basin,this study constructed a model of multistage horizontal well fracturing based on multi-cluster perforation for a composite geological structure composed of a roof,a floor,gangue,and coals.This model considered the effects of bedding and cleats in coals on fracture propagation and the fluid loss of reservoirs.Furthermore,critical reservoir parameters in the model were corrected using data derived from mini-fracture tests.These contributed to an elevated accuracy of the mod-el,which,therefore,allowed for the comprehensive characterization of the physical and mechanical properties of deep CMG reservoirs.The optimal fracturing fluid system for deep CMG reservoirs was selected through numerical simula-tion,and a method for designing the optimal pumping parameter combination under multiple objectives was developed.Finally,the simulation results were verified using microseismic data.[Results and Conclusions]The results indicate that compared to the low-viscosity slickwater and gelled systems,the variable-viscosity slickwater system was more suit-able for the fracturing of deep CMG reservoirs while also enjoying advantages in terms of fracture length,fracture width,and fracture equilibrium.The optimal parameter combination for fracturing in the target block was determined to in-clude three clusters per stage,a cluster spacing of 19 m,a proppant volume of 2.8 m3 per meter,and an injection rate of fracturing fluids of 16 m3/min.The microseismic monitoring results of test wells demonstrate that after parameter optim-ization,the fracture half-length and stimulated reservoir volume(SRV)increased by 57.2%and 12.3%,respectively.A comparison of fracture geometries under varying fracturing parameter combinations reveals that in deep CMG reser-voirs subjected to severe blocking by barriers,fractures typically cannot propagate in their height directions,necessitat-ing increasing their lengths and widths.Increasing the proppant volume and the injection rate of fracturing fluids can sig-nificantly increase fracture lengths and widths,playing a key role in improving reservoir fracturing performance.关键词
深层煤系气/水力压裂/准噶尔盆地/参数优化/数值模拟/微地震监测Key words
deep coal-measure gas(CMG)/hydraulic fracturing/Junggar Basin/parameter optimization/numerical sim-ulation/microseismic monitoring分类
石油、天然气工程引用本文复制引用
王波,金成洪,刘江,王志威,李申建,盛茂..深层煤系气水平井多簇射孔分段压裂参数优化[J].煤田地质与勘探,2025,53(4):86-93,8.基金项目
国家自然科学基金面上项目(52074315) （52074315）
