Research On Sucker Rod Pump Mixing Light Oil Lifting Technology In In-situ Combustion Production Well

Rod pump lifting method is a commonly used technology in in-situ combustion production wells,but with the extension of fire flooding time,many production wells have already entered into the responding period.It is a great difference between in-situ combustion and conventional lift in heavy oil that increasing gas production during the fire flooding responding period may significantly affected the lifting process.In addition,suitable blending diluting oil technology is necessary in lifting process,however,the flowing channels of dilute oil and produced gas are the same,that's the casing tubing annulus.As a result,blending diluting oil process and final effect can be affected by reverse flowing gas.Therefore,studying on the diluted crude oil lift is of great importance.In this paper,a fire flooding concept model was established using mathematical modeling method and production performance at different conditions were studied.Also,possible problems of in-situ combustion technology were analyzed and two viscosity reduction process including electrical heating and blending diluting oil were designed and assessed.The results indicated that blending diluting oil technology was more suitable for fire flooding production wells.At last,a wellhead spiral shunt was designed to overcome contradictions between gas production and oil diluting.Meanwhile,CFD method was used to simulate the flow field of the wellhead shunt so that pressure distribution diagram,flow velocity distribution diagram and gas-liquid distribution cloud map could be obtained,on the basis of which,diluting lifting process was researched.Final results showed that spiral wellhead shunt had good gas and light oil diversion efforts.