Research Institute of Petroleum Exploration and Development,East China Company,SINOPEC Management Office of Unconventional Resource Exploration and Development,East China Company,SINOPEC

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 orderto improve the production scope of the coal bed methane resouces under the condition ofthe multi seams and to discover the related drainageand controlsystem in conbiation wth the miurti and thi seans.large varied space between seans low permeabilityof ther geological features of the Zhejin Block.thepaper analyzed the causes of the " up seam exposed.1ow seam non-desorption and low producion eficiency of a single well" cured in the actual development pocess . with the comparison analysis on the drainage control and the production effect of the combied drainage well n the mutiseams.based on th discussion onte ltuid level reduction.casing pressure control and gas production and water production variation aw,the couping relationship betveen the pressure reducion and adsopton was defined. T'he stucy showed tat the " low velocity low casing-lader type pressure reducton' drainage system coud mest the combied dainage fech ical equrements of the multi seams and could effectively improve the single well production of the coal bed methane.

国家科技重大专项资助项目(2011ZX05035)；