RESEARCH AND APPLICATION ON MULTIPLE - SAND EXPLOITTION TECHNOLOGY IN BAOSHAN GAS FIELD OF YUN'NAN PROVINCE

The gas reservoirs of Baoshan Gas Field are shallow, unconsolidated sandstone, water bearing and lithologic, whose times belongs to Neogene system. There are many thin producing zones in vertical section, which are poor connectivity in horizon. The reserves of most gas reservoirs are very small and their outputs are very low. So the demand of natural gas is exceeding its supply. The pilot field experiments of the multiple - sand commingled production technology were carried out with two gas wells of the gas field have achieved success. As a result, not only the gas production and the developing reserves are enhanced in a large scale to assure the balance of the demand and the supply of the natural gas, but also the problems of water and sandstone production are controlled effectively to prolong the water - free gas production period and the lives of the gas wells, and to enhance the recovery efficiency of the reserves of the gas reservoirs, so as to improve the effect of development evidently. In addition, implementing the technology of the multiple sand commingled production can enhance the rate of gas production, accelerate the pace of development and shorten the payback period, in order to realize the three - dimensional and highly efficient development of this small gas field.