The practice and effect analysis of gas production with plunger drainage in tight sandstone gas reservoirs: Taking Bajiaochang Xusi gas reservoir as an example

Abstract

The Bajiaochang Xusi gas reservoir has the characteristics of low porosity, low permeability and high water saturation, and is a typical tight sandstone gas reservoir. Gas wells are generally low in productivity and generally produce water. Gas wells carry fluid smoothly under the conditions of large pressure difference in the initial stage of production. However, as the formation pressure drops, the ability of gas wells to carry fluid weakens. Some wells can only maintain production through indirection. The Tibetan production organization has brought difficulties. For gas wells with low production, low pressure, high water content, and easy accumulation of liquids, Xusi gas reservoirs have carried out drainage gas recovery technology tests such as bubble drainage and plunger gas lift, and comprehensively selected plunger gas lift as the main drainage of the block. Gas production process measures, and promoted and applied. At present, the plunger gas lift drainage gas production technology has been implemented in 13 wells, accounting for 48% of the total wells, and the measured production accounted for 31% of the total production. It is already in the stage of wide application. Through this measure, the stable liquid carrying of water-producing gas wells was realized, the productivity of gas wells was maintained, and the production decline was delayed. The production decline was controlled at about 6%, and good application effects were achieved.