Research Of Water Drainage And Gas Production By Gas Lift In EastSiChuan Carboniferous Gas Reservoirs

SiChuan Carboniferous Gas Reservoirs locate at the east basin,most part of the basin is edge water ,and in the small is bottom water.Water body is pretty active in the small which has a big effect on the development of the gas reservoir. The water breakthrough of gas reservoir infinitely limit the productivity of the well.If it can't be treat and control in time ,there will be an obviously decrease of the gas reservoir final recovery and entire development benifit.Wherefore,the research of water drainage and gas production by gas lift has a significant realism effect.In this paper, stimulation and gas lift technology were analyzed. Physical property parameters and IPR and TPR and horizontal well flow was discussed in research of technology of water drainage and gas production,established maths models of wellbore temperature field and transient gas-liquid two-phase flow in gas wells producing water.Designing method of water drainage and gas production by gas lift was researched.The working and test parameters of gas lift valve werediscussed.The top valve model was established considered formation accept fluid ability,which was proved correct in the practice.In the research of nitrogen gas-lift, transient wellbore pressure and temperature prediction model was established base on hasan method and transient gas-liquid two phase flow in gas wells producing water.The software of water drainage and gas production by gas lift was programmed based on the theory model.The result has fulfilled the request of the in-stu.