贵州六盘水煤层气井产气下降阶段负压排采技术研究
Study on Negative Pressure Drainage Technology for Declining Gas Production Stage of Coalbed Methane Wells in Liupanshui of Guizhou
邓宇 1杨晓盈 1吴文飞 1王军2
作者信息
- 1. 贵州煤层气能源开发有限公司,贵州 553000
- 2. 贵州能源集团有限公司,贵州 550081
- 折叠
摘要
目前排水降压采气是煤层气井开采的主要方式,开采过程中会达到产气下降阶段,常出现自然产量不断降低成为低产低效井.为治理该类煤层气井,需要促进煤层气的解吸、扩散和渗流,煤层气负压排采技术多次取得很好的增产效果,根据煤层负压排采技术增产因素可以逐步完善该技术的理论基础,负压排采技术在增大生产压差的同时,可能会产生煤储层解堵、促进井间干扰以及增加渗透率等效果,能最大限度降低废弃压力,提高煤层气的最终采收率.研究认为六盘水大河区块煤层气井产气量下降阶段使用负压排采技术是可行的.
Abstract
Currently,gas recovery by water drainage is the main method for coalbed methane well pro-duction,During the extraction process,gas production will enter a declining stage,often leading to the continuous decrease of natural production and becoming low-production and low-efficiency wells.To man-age such wells,it is necessary to promote the desorption,diffusion and seepage of coalbed methane,and the negative pressure drainage technology for coalbed methane has achieved a good effect in increasing production many times.By studying the factors contributing to production increase using negative pressure drainage technology of coal seam,the theoretical basis of this technology can be progressively improved.Negative pressure drainage technology may produce the effects of coal reservoir plugging removal,promo-ting inter-well interference and increasing permeability while increasing the production pressure differ-ence.This can minimize abandoned pressure and improve the final recovery rate of coalbed methane.The study concludes that using negative pressure drainage technology during the declining gas production stage of coalbed methane wells in Dahe Block of Liupanshui is feasible.
关键词
煤层气/负压排采/增产/可行性Key words
Coalbed methane/negative pressure drainage/increasing production/feasibility引用本文复制引用
基金项目
贵州省科技计划项目(黔科合战略找矿[2022]ZD001)
出版年
2024
NETL
NSTL
万方数据