大宁-吉县区块深层煤层气井间压窜主控因素分析及防治对策  

Analysis of the main controlling factors of intra-well frac hit between deep coalbed methane in Daning-Jixian block and research on countermeasures to prevent and control it

作　　者：陈明 孙俊义 王立伟 余莉珠 田浩年 王大猛 古现锋 尹泽松 张欢 CHEN Ming;SUN Junyi;WANG Liwei;YU Lizhu;TIAN Haonian;WANG Dameng;GU Xianfeng;YIN Zesong;ZHANG Huan(Linfen Branch,Petrochina Coalbed Methane Company Limited,Taiyuan 030032,China)

机构地区：[1]中石油煤层气有限责任公司临汾分公司,山西太原030032

出　　处：《煤炭科学技术》2025年第3期218-225,共8页Coal Science and Technology

基　　金：中国石油天然气股份有限公司前瞻性基础性资助项目(2021DJ2301)。

摘　　要：随着深层煤层气水平井的规模建产,其井间压窜问题也日益突显,严重影响邻近生产井的正常生产,为了避免与减缓井间压窜事件的发生以及促进压窜井的高效复产,以鄂尔多斯盆地东缘大宁—吉县区块深层煤层气水平井为研究对象,系统开展井间压窜评估。首先,依据压窜井压窜前后的产气、产液、氯离子浓度等生产及试验参数变化特征,建立井间压窜影响程度的量化指标,将其压窜影响程度按由弱至强划分为3级,依次为Ⅰ(弱干扰)、Ⅱ(中等干扰)、Ⅲ(强干扰)。然后,基于大宁—吉县区块客观地质条件和开发生产实践认识,运用多因素的灰色关联分析法,评价了开发部署(井间距离、水平段位置、垂深)、地质(天然裂缝强度)、工程(平均单簇用液规模、射孔簇数、单段用液规模、施工排量)、排采(母井生产时间)等四大类九小项影响因素,最终确定井间距离、母井生产时间、平均单簇用液规模、天然裂缝为大宁—吉县区块深层煤层气水平井压窜的主要控制因素,并基于此形成了对应的预防对策。最后,基于井间压窜影响程度的强弱及压窜主控因素分析,按照压窜井由弱至强的排液需求,从而针对性、差异化的形成了常规排液、强排措施、连油分段排液、更换采气工艺等4类高效复产措施。现场试验表明,该研究成果对大宁—吉县区块深层煤层气减小井间压窜及高效复产具有重要的指导意义。With the large-scale construction and production of deep coalbed methane horizontal wells,the problem of inter-well frac hit has become more and more obvious,which seriously affects the normal production of neighboring wells.In order to avoid and slow down the occurrence of inter-well frac hit and promote the efficient recovery of tampered wells,we systematically carry out the evaluation of inter-well frac hit by taking the deep coalbed methane horizontal wells of Daning-Jixian block in the eastern edge of Ordos Basin as the research object.Firstly,based on the production and experimental parameters such as gas production,liquid production and chloride ion concentration before and after the pressure frac hit,the quantitative indexes of the influence degree of the pressure frac hit between wells were established,and the influence degree of the pressure frac hit was classified into three grades from weak to strong,which wereⅠ(weak interference),Ⅱ(medium interference)andⅢ(strong interference)in the order of the degree of influence of the pressure frac hit.Then,based on the objective geological conditions of Daning-Jixian block and the understanding of development and production practice,using the multi-factor gray correlation analysis method,we evaluated four categories and nine sub-factors of influencing factors,such as devel-opment and deployment(distance between wells,location of horizontal section,vertical depth),geology(strength of natural fracture),en-gineering(average scale of single-cluster fluid,number of perforation clusters,scale of single-section fluid,and construction displacement),and drainage and extraction(production time of the parent well),the distance between wells,production time of the parent well,average single-cluster fluid size,and natural fracture were identified as the main control factors for the pressure frac hit of deep-seated coalbed methane horizontal wells in Daning-Jixian block,and corresponding preventive countermeasures were developed based on these factors.Finally,based on t

关 键 词：深层煤层气 大宁—吉县区块 压窜 分级分类 灰色关联 防治对策 

分 类 号：TE375[石油与天然气工程—油气田开发工程]