高煤阶煤层气井压降扩展规律研究及应用——以沁水盆地樊庄区块为例
Research on Pressure Drop Expansion Law and Application of High-Rank Coalbed Methane Wells——A Case Study of Fanzhuang Block in Qinshui Basin
吴浩宇 1刘忠 1鲁秀芹 1张晨 1张倩倩 1王子涵2
作者信息
- 1. 华北油田公司勘探开发研究院,河北 062550;中国石油天然气集团有限公司煤层气开采先导试验基地,河北 062550
- 2. 华北油田公司勘探开发研究院,河北 062550
- 折叠
摘要
文章以沁水盆地樊庄区块直井为研究对象,综合考虑因排采降压差异导致的储层渗透率动态变化这一特征,通过搭建应力-压缩性-渗透性三者之间的关系,构建了适用于高煤阶煤储层的气-水流动模型,同时分别对单相产水阶段、两相采气阶段的压降扩展规律进行了量化分析,理清了樊庄区块煤层气井压降扩展规律,从而优化了现场单井排采制度.结果表明:在采气阶段存在最佳提气速度,其次确定了影响煤储层压降扩展的6个主控因素,拟合得到了采气阶段-最佳提气速度预测公式,为樊庄区块及类似地区煤层气井的排采管控提供了指导依据.
Abstract
The paper focuses on the vertical wells in the Fanzhuang Block of Qinshui Basin.By compre-hensively considering the dynamic changes in permeability caused by variations in drainage pressure,a gas-water flow model suitable for high-rank coal seams is constructed by establishing the relationship be-tween stress,compressibility,and permeability.Meanwhile,the pressure drop expansion law during both the single-phase water production stage and the two-phase gas-water production stage is quantitatively an-alyzed,clarifying the pressure drop expansion patterns of the coalbed methane wells in Fanzhuang block,and optimizing the field drainage system for single wells.The results indicate that there is an optimal gas extraction rate during the gas extraction stage.Additionally,six main control factors affecting the pressure drop expansion in coal reservoirs are determined,and a prediction formula for the optimal gas extraction rate during the gas extraction stage is developed,guiding the drainage management and control of coalbed methane wells in Fanzhuang Bock and similar areas.
关键词
沁水盆地/高煤阶煤储层/渗透率变化差异/压降量化指标/最佳提气速度Key words
Qinshui Basin/high-rank coal reservoir/permeability dynamic variation/quantitative pres-sure drop indicator/optimal gas extraction rate引用本文复制引用
出版年
2024
NETL
NSTL
万方数据