Desorption of methane gas is controlled by the static pressure of formation water. Drainage of formation water provides pressure difference and space for gas desorption.
地层水的静水压力控制了甲烷气的解吸作用，地层水的排出可为气体的解吸提供压力差和空间。
2
Compared with gravity drainage system, it has the advantages of small pipe diameter and installing space, non-sloped suspended pipe, less sewage connecting and underground pipes and etc.
与重力排水系统相比，具有管径小、管道安装要求空间小、悬吊管无坡度、下水道连接管和埋地管少等优点。
3
The contamination or damage to spacecraft can be avoided during the space conjunction and spacedrainage of liquid for spacecraft, if the appropriate measures are taken.