石油钻采工艺2024，Vol.46Issue(1)：119-129,11.DOI:10.13639/j.odpt.202305042
煤层气水平井筛管密集分段径向射流增透方法
Dense segmented radial jetting stimulation method of screen tube in coalbed methane horizontal well
摘要
Abstract
The permeability of coal near shaft wall is low for the reservoir damage,and the space of conventional segmented hydraulic jetting is long.A method of dense segmented radial jet with pre-drilled holes as nozzles was proposed to improve the permeability of coal near shaft wall,and the spring-hydraulic packer and liquid injection nipple were designed and optimized for horizontal well completion with pre-drilled liner.The calculation model of single pre-drilled hole radial jetting and seepage increment ratio of coal breaking cave near shaft wall are established.The number of pre-drilled holes per meter,exit jetting velocity of pre-drilled hole and flow rate were optimized.The influence of permeability ratio Kγ between the solid intrusive zone and the filtrate intrusive zone and the depth of solid intrusion zone Hs on the seepage increment ratio of coal near the shaft wall is analyzed.The results show that the spring-hydraulic packer with a design of non-skeleton rubber cylinders,radial sliders,and strong tensile spring,which improves the stability of high-frequency sealing of the dense segmented radial jetting tools within the pre-drilled liner,achieving completion and reservoir stimulation in one trip for coalbed methane horizontal well.Under the conditions of Hs=3.5 cm and Kγ=0.01,the radial hydraulic jetting space of the pre-drilled liner was reduced to the pre-drilled hole space of 0.05 m,and the seepage increment ratio of coal methane horizontal well increased by 5.5%with dense segmented radial jetting.The research results provide technical guidance for solving the reservoir damage challenge in coalbed methane horizontal wells completed with pre-drilled liner,and theoretical basis for permeability enhancement operations in coal near shaft wall.关键词
煤层气/水平井/密集分段/筛管完井/渗流增量比Key words
coalbed methane/horizontal well/dense segmentation/screen tube completion/seepage increment ratio分类
石油、天然气工程引用本文复制引用
毕延森,高德利,鲜保安..煤层气水平井筛管密集分段径向射流增透方法[J].石油钻采工艺,2024,46(1):119-129,11.基金项目
国家自然科学基金"复杂结构井工厂立体设计建设基础研究"(编号:52234002) （编号:52234002）
国家自然科学基金"煤层气低产储层靶向改造增产关键理论及技术基础"(编号:42230814). （编号:42230814）
