贵州织金区块多煤层合采煤层气排采制度研究  

Study on combined coalbed methane drainage system of multi seams in Zhijin Block,Guizhou

作　　者：彭兴平[1] 谢先平[2] 刘晓[2] 杨松[2] 

机构地区：[1]中国石化华东分公司石油勘探开发研究院,江苏南京210011 [2]中国石化华东分公司非常规资源勘探开发指挥部,江苏南京210011

出　　处：《煤炭科学技术》2016年第2期39-44,共6页Coal Science and Technology

基　　金：国家科技重大专项资助项目(2011ZX05035)

摘　　要：为了提高多煤层条件下煤层气资源动用规模,探索相应排采管控制度,结合织金区块煤层多而薄、层间距变化大、渗透率低等地质特征,分析了在实际开发过程中造成上部煤层裸露而下部煤层未解吸、单井产能低效的原因;通过对多煤层合采气井的排采控制与生产效果的对比分析,在探讨液面降幅、套压控制与产气、产水变化规律的基础上,明确了降压与解吸之间的耦合关系。研究表明:"低速-低套-阶梯式降压"排采制度满足多煤层合采技术要求,可以有效提高煤层气单井产能。In order to improve the production scope of the coal bed methane resources under the condition of the multi seams and to discover the related drainage and control system,in combination with the multi and thin seams,large varied space between seams,low permeability of other geological features of the Zhejin Block,the paper analyzed the causes of the ＂ up seam exposed,low seam non-desorption and low production efficiency of a single well＂ occurred in the actual development process. With the comparison analysis on the drainage control and the production effect of the combined drainage well in the multi seams,based on the discussion on the liquid level reduction,casing pressure control and gas production and water production variation law,the coupling relationship between the pressure reduction and adsorption was defined. The study showed that the ＂ low velocity- low casing- ladder type pressure reduction＂ drainage system could meet the combined drainage technical requirements of the multi seams and could effectively improve the single well production of the coal bed methane.

关 键 词：排采制度 阶梯式降压 多煤层 合采气井 织金区块 

分 类 号：TE377[石油与天然气工程—油气田开发工程]