Abstract:

The quantity of the water production and the number of water producing wells of water-rich blocks of Ma5 gas reservoir in Jingbian gas field increase rapidly, with an expanding water-rich area, so it damages the exploitation of the gas reservoir seriously. Based on classifying the gas reservoir as waterrich region, water invaded region and gas region, the reasons of expanding the water body in four aspects and the methods to control water in three ways are discussed and proposed. The original gas-water distribution is the basis for the expansion of water production areas. The difference of reservoir properties is the potential cause of water-rich regions expanding. The storage and transport capacity of water bodies is determined by the characteristics of micro-pore structure. Under the imbalance of formation pressure, which caused by exploration, water flows from water regions to gas regions. To control water and produce gas, three ways are proposed. Make sure various types of well operating in the proper drawdown pressure. The types of gas wells should fit recovering gas and draining water,the drawdown pressure should be ensured to meet the well normal production. The development strategy of “Draining water inside and keeping pressure outside”, “Taking drainage as key measure”, “Controlling the balance of block pressure” is proposed.

Key words: water-rich area, reservoirs, physical property, micro-pore structure, water controlling and gas recovery, Jingbian gas field