Study On The Technology Of Downhole Gas-water Separator

In order to prevent the flooding of gas well, a highly efficient and compact downhole gas-liquid separator with simple structure is developed, so as to realize downhole gas-liquid separation, injection of the water and exploitation of nature gas. This will largely reduce the cost of lift and disposal, prolong development life-span, enhance gas recovery, abate the pollution, and simplify surface device and management. It will play an important roll in the economic and social benefit. The state-of-the-art of gas-liquid separation, gas-liquid-two-phase simulation, droplet collision and coalescence, and numerical simulation is reviewed in the thesis. The diagnosis method of gas well water accumulation is proposed. The downhole nature gas parameters for some gas well of Shengli oil field are calculated. The gas turbulent flow and the gas-liquid turbulent flow are simulated with CFD software FLUENT. Laboratory testing system is used to measure separation efficiency of auger separator. A comparison among the laboratory testing, the numerical results and calculated results reveals that they have the same develop trends though there exists a little deviation. The CFD method is available for the complex auger flow field. The CFD method is a powerful tool for the optimum design of auger separator.