The gas reservoir has extremely high maximum efficient rate, and the characteristic feature is containing one phase of water nearly saturated with gas except small proportion of free gas bubbles. The sand of reservoir is very loose containing high percentage of fine grain sand and causes remarkable sand troubles. This is one of the most important technical problems to be solved. The better location of gas wells is on the structurally lower synclinal area, because the content of methane is also higher than those of structurally higher area.
