煤田地质与勘探2025，Vol.53Issue(6)：181-190,10.DOI:10.12363/issn.1001-1986.24.12.0775
致密气-深部煤层气协同开发化学暂堵全通径老井筒重构技术
Chemical temporary plugging-based full-bore reconstruction technology for old wellbores for the collaborative production of tight-sand gas and deep coalbed methane
摘要
Abstract
[Objective]In China,the Ordos Basin boasts abundant coal-measure gas resources,holding considerable po-tential for resource development.As the development deepens,the proportion of depleted,stripper,and inefficient wells for tight-sand gas in coal measures has gradually decreased year by year.The collaborative production of tight-sand gas and deep coalbed methane(CBM)has emerged as a significant approach to effectively releasing production capacity.[Methods]To achieve the reconstruction of old wellbores and commingled production of new and old layers,this study proposed a technology of chemical temporary plugging-based full-bore reconstruction of old wellbores of tight-sand gas combined with the large-scale production of deep CBM.Specifically,a chemical temporary plugging material system was developed based on the concept of dynamic chemical temporary plugging through large-particle bridging,medium-particle filling,and adaptive powder plugging.In combination with the fractal theory and the plugging layer instability criterion,this study constructed a multi-purpose calculation model for the permeability and strength of plugging layers.Accordingly,it proposed an optimized ratio of particle sizes 3-4 mm,1-2 mm,and 0.15 mm at 1∶2∶4 to plug low-pro-ductivity and inefficient old layers.This created favorable conditions for the fracturing and stimulation of deep coal seams.The proposed technology was applied to the field test conducted in the Linxing-Shenfu Block in the Ordos Basin,validating the rationality and feasibility of the proposed wellbore reconstruction technology and composite temporary plugging material system.[Results and Conclusions]Field implementation of the optimized composite temporary plug-ging agent achieved full-bore wellbore reconstruction based on chemical temporary plugging,effectively plugging the stimulated reservoirs in the old well,with the pressure born by the plugging layer exceeding 60 MPa.The fracturing pro-cess using smooth casings,integrated variable-viscosity slickwater,and temporary plugging knots was employed to stim-ulate the deep coal seams.The pressure was maintained stable in the proppant injection stage,with no leakage sites or fracturing liquid division observed.Therefore,large-scale volume fracturing of the deep coal seams lying below the tight-sand gas layer was successfully achieved.The results of this study are expected to provide technical support for both the succeeding production of tight-sand gas pay zones in old wells and the collaborative production of tight-sand gas and CBM.关键词
深部煤层气/致密气井/化学暂堵剂/粒度分布/井筒重构/协同开发Key words
deep coalbed methane(CBM)/tight-sand gas well/chemical temporary plugging agent/particle size distri-bution/wellbore reconstruction/collaborative production分类
能源科技引用本文复制引用
杨帆,谭章龙,胡家晨,安琦,李宇,杨睿月,林俊文,孙泽宁,井美洋..致密气-深部煤层气协同开发化学暂堵全通径老井筒重构技术[J].煤田地质与勘探,2025,53(6):181-190,10.基金项目
国家自然科学基金项目(52274014) （52274014）
