In the late production period of gas well, complex drainage gas recovery technology is the important measure for raising the recovery efficiency of gas reservoir.
分析并提出气井各生产阶段的工艺技术措施与对策，气井生产后期应用复合型排水采气技术是提高气藏采收率的重要措施。
This reservoir belong to weak water blocking type and the recovery efficiency can be improved greatly with water drainage gas production.
提出该气藏属弱水堵气藏，可用排水采气法大幅度提高采收率。
The partial ventilator in the coal mine is an important equipment in mine digging, its dependability and efficiency affect directly the safety of gas drainage.
局部通风机是煤矿井下掘进过程的重要设备，其使用的可靠性和效能直接影响着瓦斯的安全排放。
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