煤层气田老井网立体开发方式探讨  

Discussion on the three-dimensional development model of the old well pattern in coalbed methane field

作　　者：李俊[1] 张聪[1] 张建国[1] 彭鹤[1] 崔新瑞[1] 朱敏[1] LI Jun;ZHANG Cong;ZHANG Jianguo;PENG He;CUI Xinrui;ZHU Min(Huabei Oilfield Shanxi CBM Branch Company of Huabei Oilfield Company PetroChina,Changzhi 046000,China)

机构地区：[1]中石油华北油田山西煤层气勘探开发分公司,山西长治046000

出　　处：《煤田地质与勘探》2020年第5期73-80,共8页Coal Geology & Exploration

基　　金：国家科技重大专项课题(2016ZX05042-005);中国石油天然气股份有限公司科学研究与技术开发项目(2018D-5006-37)。

摘　　要：为提高煤层气开发区块储量动用程度,当单井产量进入递减期后,需进行开发方案调整,通过调层或补层等措施实现增产稳产。在时间上,认为投产时应优先开发主力煤层,待进入递减期后,对次主力煤层进行补层合采;在空间上,结合开发动态,利用层次分析法,确定影响产量的主控指标及其权重,再对不同煤层求取各指标差值,归一化处理后精细确定井区的主力煤层分布特征;通过对地质储量与采出气量进行网格化处理,求取剩余储量分布特征,最终通过主力煤层分布与对应的剩余储量分布的叠加,确定最佳的开发顺序;并针对不同的开发顺序优化压裂和排采工艺。提出的煤层气老井网内立体开发方式,在樊庄区块郑村井区已取得好的应用效果,提高了煤层气采收率,实现了区块长期稳产,对多煤层发育的区块,该技术具有推广借鉴意义。In order to increase the degree of production of CBM development blocks,when the production of a single well enters a decline period,the development plan needs to be adjusted,and the production increase and stability can be achieved through the measures such as layer adjustment or layer compensation.In terms of time,it is believed that the main coal seam should be developed first when it is put into production.After the decline period,the secondary main coal seam should be supplemented and combined;in space,combined with the development dynamics,the analytic hierarchy process is used to determine the main control indicators that affect the output and their weights,and then calculate the difference of each index for different coal seams,and after normalization,the distribution characteristics of the main coal seams in the well area are finely determined;the remaining reserves distribution characteristics are obtained by gridding geological reserves and produced gas.Finally,through the superposition of the main coal seam distribution and the corresponding remaining reserves distribution,the best development sequence is determined;and the fracturing and drainage technology is optimized for different development sequences.The proposed three-dimensional development method in the old CBM well pattern has achieved good development results in the Zhengcun well area of the Fanzhuang block,and finally realized the long-term stable production of the block and improved the recovery rate.For blocks with multiple coal seams,it is of significance for promotion.

关 键 词：煤层气 层次分析法 立体开发 层间干扰 郑村井区 

分 类 号：P618.11[天文地球—矿床学]