地面煤层气井水力压裂改造渗透率反演及主控因素  

Permeability inversion and main control factors of hydraulic fracturing transformation of surface coalbed methane wells

作　　者：李庚 陈本良 梁兴[2] 丁海[3] 李琰庆[5] 方惠京[3] 丰安祥 王勃 解志在 曹腾飞 周韬 LI Geng;CHEN Benliang;LIANG Xing;DING Hai;LI Yanqing;FANG Hujing;FENG Anxiang;WANG Bo;XIE Zhizai;CAO Tengfei;ZHOU Tao(Safe Coal Mining Engineering Technology Research Institute Com pany Limited,Huainan 232001,China;Zhejiang oilfield branch,China National Petroleum Com pany Limited,Hangzhou 311100,China;Eaploration Research Institute,Anhui Provincial Bureau of Coal Geology,He fei 230088,China;Information Research Institute of Emergency Management Department,Beijing 100029,China;Huainan Mining(Group)Company Limited,Huainan 232001,China)

机构地区：[1]平安煤炭开采工程技术研究院有限责任公司,安徽淮南232001 [2]中国石油天然气股份有限公司浙江油田分公司,浙江杭州311100 [3]安徽省煤田地质局勘查研究院,安徽合肥230088 [4]应急管理部信息研究院,北京100029 [5]淮南矿业(集团)有限责任公司,安徽淮南232001

出　　处：《建井技术》2025年第2期73-81,共9页Mine Construction Technology

基　　金：2024年安徽省自然资源厅公益性地质工作项目(2024-g-1-6)。

摘　　要：储层改造是目前煤层气开发的关键技术之一,渗透率反演是评价储层改造效果的关键参数。基于滇东黔西10口开发井排采数据,利用试井法反演了压裂改造后的储层渗透率,划分了压裂曲线类型并对储层改造效果进行了定性评价,分析了地质因素与工程因素对改造效果的影响。研究区开发井储层改造渗透率介于0.38~64.10 mD,改造前后渗透率变化幅度介于4~293倍之间。研究表明:较高的原位渗透率、较高的原生碎裂结构煤占比有利于储层改造效果,改造渗透率随其增大而增大;较大的埋深、较高的地应力条件不利于储层改造,改造渗透率随其增大而减小;较大的压裂液强度、携砂液强度、加砂强度、携砂液排量有利于储层渗透率的改造,改造渗透率随其增加而增大;较高的砂比不利于储层改造,改造渗透率随其值的增加而减小;合层压裂并不能增强渗透率的改造效果,储层改造渗透率随压裂层数的增加而减小。在进行多煤层储层改造时,应优选埋深较浅、地应力较低且原位渗透率较大、原生碎裂结构煤占主导的煤层,并适当加大压裂液、携砂液、加砂强度,减小砂比,进行单一煤层压裂。Reservoir reform is one of the key technologies for CBM development.The permeability inversion is a key parameter for evaluating the effect of reservoir reform.Based on the drainage data of 10 development wells in the research area,the well test method was used to invert the reservoir permeability after fracturing transformation,the type of fracturing curve was divided,and the reservoir reformation effect was qualitatively evaluated,the influence of geological factors and engineering factors on the transformation effect is analyzed.The permeability of the reservoir development in the study area is between 0.38 and 64.10 mD,and the variation of the permeability before and after the transformation is between 4 and 293 times.The research shows that the higher in-situ permeability and higher proportion of primary fractured coal are beneficial to the reservoir reconstruction effect,and the modified permeability increases with the increase;the larger buried depth and higher ground stress condition is not conducive to the reservoir transformation,and the transformation permeability decreases with the increase;the larger fracturing fluid strength,the sand-carrying fluid strength,the sand-adding strength,and the sand-carrying liquid displacement are beneficial to the transformation of the reservoir permeability.The higher sand ratio is not conducive to the reservoir transformation,and the modified permeability decreases with the increase of its value;the combination of cracking does not enhance the permeability of the transformation,the reservoir transformation permeability it decreases as the number of fracturing layers increases.When carrying out multi-coal reservoir reconstruction,it is preferred to have a shallower buried depth,lower in-situ stress and larger in-situ permeability,and the primary fractured coal dominates the coal seam,and appropriately increase the fracturing fluid,sand-carrying fluid,Adding sand strength,reducing sand ratio,and performing single coal lamination cracking.

关 键 词：渗透率 改造效果 主控因素 水力压裂 煤层气 

分 类 号：TE37[石油与天然气工程—油气田开发工程]