Plunger Lift Drainage Water Gas Production Technology Research For Well Startup Continuous Production

Plunger lift is a method of artificial lift which uses a free plunger traveling up and down the tubing in a cyclic manner to lift the fluids from the reservoir to the surface. The use of the plunger as a solid sealing interface between the expanding gas and the liquid slug helps to prevend gas breaking through the slug and decreases the fallback of liquids, which serves the efficiency of lifting liquids. Plunger lift is one of most efficient lift manner in intermittent lift. But Plunger lift has to close well to resume the stratum pressure, at the same time, the plunger often can't drop to the bottom of the well by well wall friction, resulting in the low drainage gas efficiency. On the basic of the former study and patent technics named temperature control umbrella plunger, considering the shortcoming of the routine plunger drainage gas, The paper brings forward open well continuous productions drainage gas technics. It has established plunger gas lift dynamic parameter model, and has simulated drop courses of the plunger in several flow patterns. For example, whether plunger can drop to bumper of the bottom well or not, several flow pattern limit in wellbore, the flowing velocity of the plunger in several flow pattern, the run-cycle of the plunger, gas output and drainage water everyday, etc. Considering the primarily principle of the plunger lift and testing condition of Szechwan gas fields these years, The paper has amended and perfected the model, predigested the calculation course, and worked out plunger gas lift optimizing design program. The calculation result of the programme can coincide with fact result of the well spot by example testing of well spot. It provides the theory bases for extending and applying of the technics...