doi:10.16186/j.cnki.1673-9787.2020.1.2

Received:2019/04/06

Revised:2019/05/23

Published:2020/01/15

Interlayer interference analysis of the multi-layer drainage for multiple seams CBM inLaochang mining area of eastern Yunnan province

ZHANG Erchao1,2, WU Caifang1,2, DANG Guangxing1,2, ZHANG Shasha1,2

1.Key Laboratory of CBM Resources and Dynamic Accumalation Process， Ministry of Education， China University qfMining and Technology ，Xuzhou  221008 ， Jiangsu， China;2.School of Resources and Geoscience， China University of Mining and Technology， Xuzhou  221008 ， Jiangsu， China

Abstract:In order to study the interlayer interference behavior during the multi-layer drainage of coalbed methane （ CBM ） wells in multiple coal seams area， taking multi-layer drainage of coalbed methane well in Laochang mining area of eastern Yunnan province as the sample， the geological conditions of CBM and the production practice of CBM wells were studied， and the dynamic process of interlayer interference and its influencing factors was discussed. The results showed that， reservoir pressure and interlayer spacing were important factors that affected the exploitation of multi-layer CBM drainage in this area. Using numerical simulation software Eclipse， the drainage and production performance of existing coalbed methane wells were studied， the influences of reservoir pressure and interlayer spacing on multi-layer drainage were analyzed. Finally， the interlayer interference coefficient A was introduced to quantify the interlayer interference. The introduction of interlayer interference coefficient A could effectively determine the selection scheme of coalbed mining， which was of theoretical significance for the selection of coalbed mining horizons.

Key words:Laochang mining area;multiple coal seams;CBM;multi-layer drainage;interlayer interference;quantitative characterizationinterference coefficient

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