doi:10.16186/j.cnki.1673-9787.2020.3.2

Received:2019/07/24

Revised:2019/09/26

Published:2020/05/15

Productivity characteristics and influencing factors of coalbed methane wells in Yuw-ang block of Laochang mining area in eastern Yunnan and western Guizhou provinces

FANG Xiaojie1,2, WU Caifang1,2, LIU Xiaolei1,2, ZHANG Shasha1,2, LIU Ningning1,2

1.School of Resource and Earth Science， China University of Mining and Technology， Xuzhou  221116 ， Jiangsu， China;2.Key Laboratory of Coalbed Methane Resource and Reservoir Formation Process， Ministry of Education ，Xuzhou  221116 ， Jiangsu， China

Abstract:In order to study the main factors that influence the productivity of coalbed methane wells in multiseam development area， taking Yuwang block of Laochang mining area in eastern Yunnan and western Guizhou provinces as the research area， the characteristics of gas and water production of coalbed methane wells were studied based on the geological data in the area， and the key factors affecting the productivity of CBM wells were revealed， then the preliminary suggestion of CBM drainage systems were put forward. The results showed that the number of low -yielding CBM wells in Yuwang block accounted for 73% of the total CBM wells. The main factors affecting gas well productivity included geological factors and drainage factors. Geological factors included in-situ stress and permeability， and drainage factors included water production rate and well shutdown times. The research suggested that coalbed methane exploration and development should be carried out inlocations or sections with medium-low in-situ stress and high permeability in this area. In the initial stage of CBM well drainage， the daily water amount should be controlled within 1.5~3 m³/d. After gas production started， the daily water amount should be controlled within 1~1.8 m³/d， and the number of shutdowns should be reduced throughout the drainage process

Key words:eastern Yunnan and western Guizhou provinces;Laochang mining area;Yuwang block;coalbed methane well;productivity charalteristic;geological factor;drainage factor

滇东黔西老厂矿区雨汪区块煤层气井产能特征及其影响因素_房孝杰.pdf