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川南矿区已发现的气藏,主要是碳酸盐岩裂缝—孔隙型气藏。经过20多年的勘探、开发,证实这类气藏储层产状和储渗体类型复杂,具有纵向上多产层、横向上多裂缝系统、气水关系复杂等特点。许多气井都因在生产的一定阶段产出大量地层水,又不能及时排出井筒积液,使气产量急剧递减,并最终导致水淹。使气井水淹的水,不一定都来自主产层,往往有的来自不产气的高含水层。对来自非产层的水,若采用常规的排水采气工艺,尽管也可降低井底流
Gas reservoirs that have been discovered in the southern Sichuan mining area are mainly carbonate fracture-pore gas reservoirs. After more than 20 years of exploration and development, these reservoirs have been proven to be complicated in reservoir type and reservoir type. They have the characteristics of multi-layer in the longitudinal direction, multi-fracture system in the horizontal direction, and complicated gas-water relationship. Many gas wells are producing large amounts of formation water at a certain stage of production, and can not discharge wellbore fluid in time, drastically reducing gas production and eventually flooding. The water flooded by a gas well does not always come from the main producing layer, but often comes from a high-water-bearing layer that does not produce gas. For the water from the non-pay zone, if the conventional drainage and gas production process is adopted, the bottom hole flow can be reduced