关键词: 致密气藏, 排水采气, 泡沫排水, 速度管柱, 柱塞气举, 智能化

Abstract: The gas-water relation is complicated in Sulige tight gas reservoirs with a wide scope of formation water distribution. The gas well in the area is usually water-bearing. The unique low permeability, low pressure, and low abundance of such gas reservoirs lead to insufficient gas supply capacity, low gas production and rapid decline in gas wells, and serious liquid accumulation in the entire life cycle. To keep production of the tight gas field stable and cost-effective, three backbone technologies – foam drainage, velocity string and plunger gas lift – were developed as the main technological series of drainage gas recovery and the key auxiliary tools. As a result, the technological policy for drainage gas recovery was formulated for the life cycle of a gas well to meet the need for differentiated applications at the gas fields. Focusing on the special well conditions, the horizontal well plunger drainage gas recovery technology and casing plunger drainage gas recovery technology were developed to effectively solve the bottlenecks for application of the complicated wellbore drainage gas recovery technology. The 50.8mm-diameter coiled tubing completion and production integration technology was developed to satisfy the demand for high-efficiency drainage of gas wells, saving the production cost. The intelligent gas-well management platform was established to liberate manpower from on-site management and bring the gas wells under intelligent management. The drainage gas recovery technology was studied in the light of the existing technological bottlenecks. It is necessary to continue the research on the characteristic technological series of tight gas drainage recovery, make continuous breakthroughs in the lower limit of recoverable tight gas volume and further promote high-quality development of gas fields.