成熟区块煤层气加密井堵漏工艺优选  

Plugging technology optimization of coalbed methane infill well in mature block

作　　者：李蜀涛 朱韩友 尹中山 钱程 张秀军 周瑞琦 牟必鑫 皇扶杉 丁飞飞 LI Shutao;ZHU Hanyou;YIN Zhongshan;QIAN Cheng;ZHANG Xiujun;ZHOU Ruiqi;MOU Bixin;HUANG Fushan;DING Feifei(Sichuan Institute of Energy Geology,Chengdu 610500,China;Sichuan Geological Survey and Research Institute,Chengdu 610500,China)

机构地区：[1]四川省能源地质调查研究所,四川成都610500 [2]四川省地质调查研究院,四川成都610500

出　　处：《煤炭工程》2024年第1期70-77,共8页Coal Engineering

基　　金：构造复杂矿区煤层气立体开发关键技术应用与研究(102201017);工技公司山西地区煤层气钻机及钻井技术服务专有协议(102101103)。

摘　　要：为解决沁水盆地成熟区块加密井钻井施工过程中井漏的问题,基于研究区块实钻井身结构,建立三维井筒裂缝模型,采用Ansys-Fluent软件分别模拟常规堵漏浆、承压堵漏浆、凝胶堵漏浆在地层裂缝中的流动情况,并利用现场施工实例对仿真结果进行验证。结果表明:堵漏耗时方面,凝胶堵漏<承压堵漏<常规堵漏;固井环空水泥返高方面,凝胶堵漏>承压堵漏>常规堵漏;完井承压耗时方面,凝胶堵漏<承压堵漏<常规堵漏;结合三种堵漏工艺的优缺点表明:若发生单点漏失,且漏失层位明确,则采用凝胶堵漏效果较好;若漏失点较多,且漏失层位不明确,则采用承压堵漏效果较好。此外,优选堵漏工艺结合井口加压工艺相对于常规静止堵漏工艺,堵漏耗时更短,漏失地层承压能力更高,堵漏效果更好,且所需承压设备现场易制作,操作简单,适用性更强。In order to solve the problem of lost circulation during infill drilling in mature blocks of the Qinshui Basin,a 3D well bore fracture model was developed based on the study of the actual well bore structure in the blocks,Ansys-Fluent software was used to simulate the flow of conventional plugging,pressurized plugging,gel plugging in formation fractures,and the simulation results were verified in field construction.The results show that,the time of plugging ranks as:gel plugging<pressure plugging<conventional plugging;the return height of cementing annulus cement ranks as:gel plugging>pressure plugging>conventional plugging.Combining with the advantages and disadvantages of the three lost circulation techniques,it is shown that the effect of gel plugging is better if a single point loss occurs and the lost circulation location is clear;if it is a multi-points leakage,and the leakage location is not clear,then the pressurized plugging is better.In addition,compared with the conventional static plugging technology,the optimized plugging technology combining with wellhead pressure technology has the advantages of less plugging time,higher pressure bearing capacity of the lost formation and better plugging effect,and the required pressure bearing equipment is easy to make on the spot,which is of simple operation and stronger applicability.

关 键 词：沁水盆地 煤层气 井漏 堵漏工艺 常规堵漏 承压堵漏 凝胶堵漏 

分 类 号：TD166[矿业工程—矿山地质测量]