沁水盆地柿庄南区块煤层气井储层压降类型及排采控制分析

为了充分认识柿庄南区块煤层气井储层压力变化特征及其对煤层气井产量的影响，基于对柿庄南区块储层地质参数的分析及实际生产数据的剖析，对不同类型生产井的储层压降类型进行分析归类，并结合排采异常井对气井低产原因、排采控制方法及储层敏感效应进行具体分析。结果表明:柿庄南区块煤层气井储层压降可分为快速下降型、中期稳定型及缓慢下降型3种类型，其中快速下降型井更有利于煤层气高产稳产，但若降压速率超过快速下降型井的最大降压速率反而会使储层受到压敏、速敏效应，降低储层渗透率，同时导致压降漏斗扩展受限，最终抑制煤层气井达到高产稳产。 

Analysis on the type of reservoir pressure drop and drainage control of coalbed methane well in the southern block of Shizhuang

In order to fully understand the reservoir pressure variation characteristics of coalbed methane wells in the southern block of Shizhuang and based on the analysis of reservoir geological parameters and the analysis of actual production data, the reservoir pressures of different types of production wells are analyzed. The specific analysis of the drainage control and reservoir sensitivity effects is also carried out based on the abnormal wells. The results showed that the reservoir lamination of coalbed methane wells in the southern block of Shizhuang can be divided into three types, namely type of rapid pressure drop, type of medium-term stability and type of slow pressure drop. Among them, most high gas production wells are of the type of rapid pressure drop, but too fast drainage and depressurization speed will cause reservoirs to be subjected to various sensitive effects, reduce reservoir permeability, and various factors lead to limited expansion of pressure drop funnels. Finally, the coalbed methane well is inhibited from reaching high yield.