石油钻采工艺2025，Vol.47Issue(1)：121-130,10.DOI:10.13639/j.odpt.202411065
碎软低渗煤层顶板水平井定向压裂技术提高单井产量
Directional fracturing technology for cliff horizontal wells to increase single well production of fragmented soft and low-permeability coal seam
摘要
Abstract
In response to the problems of poor underground treatment effect and low gas production caused by low permeability and high gas content in the fragmented soft and low-permeability coal seam of Zhaozhuang Mine,as well as the difficulty in gas extraction due to low gas production in conventional vertical wells,directional fracturing technology for cliff horizontal wells is proposed to improve the efficiency of coalbed methane extraction and offer support for low-carbon green mining.Taking account of the drillability of cliff rock and hydration laboratory finds of mudstone,the well finish position of cliff horizontal well in mudstone or sandy shale neighbouring the coal seam is optimal.By combining well inclination,azimuth data,and near drill bit inclination data with directional operation software,precise control of wellbore trajectory is achieved,thus realizing safe and efficient drilling.Directional perforation fracturing is carried out in the horizontal section to effectively communicate the cliff horizontal wells with underlying coal seam.Adopting precise pressure control and extraction technology by screw pump enables long-term stable production of coalbed methane wells.The on-site test results show that by the end of 2024,the cumulative gas production of the experimental wells was 7.1156 million m3,with a maximum daily gas production of 11,200 m3/d.The daily gas production during the stable production period was 3,500-4,500 m3/d,keeping the stable production lasting for more than 5 years.This provides technical support and experience for advanced pre-extraction of coalbed methane and resource utilization in high gas,soft and low-permeability coal seams.It is recommended to further promote and apply coalbed methane development under similar geological conditions to improve the efficiency of coalbed methane extraction and boost the low-carbon and green development of the coal industry.关键词
碎软煤层/顶板水平井/井眼轨迹/定向压裂/控压排采Key words
fragmented soft coal seam/cliff horizontal well/wellbore trajectory/directional fracturing/pressure control and drainage分类
天文与地球科学引用本文复制引用
秦玉霞,李国富,张永成,刘亮亮,李德慧,张为,白杨..碎软低渗煤层顶板水平井定向压裂技术提高单井产量[J].石油钻采工艺,2025,47(1):121-130,10.基金项目
国家自然科学基金面上项目"煤层气水平井水力喷射分段造穴应力演化机理"(编号:52274014) （编号:52274014）
山西省重点研发计划项目"深部煤层气地质—工程一体化高效联动开发技术与工程示范"(编号:202202080301010) （编号:202202080301010）
山西省揭榜招标项目"煤层气储层三维精细地质建模方法及软件研发"(编号:20201101004). （编号:20201101004）
