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In order to study the influence factors of particle carrying capacity of foam fluid during the reverse circulation washing process, a model of reverse circulation well washing by foam fluid was established based on finite element method. The influence of injection temperature and foam quality on the particle carrying capacity of foam fluid was analyzed. The numerical simulation results show that the injection temperature of foam fluid increases from 15 °C to 80 t, the carrying rate decreases by about 7. 3%. The foam quality of foam fluid increases from 0. 65 to 0.95, the particle carrying rate increases by about 8. 3%. The results show that the particle carrying capacity of foam fluid decreases with the injection temperature increase during the reverse circulation washing process of foam fluid. The foam quality of foam fluid has a greater influence on the particle carrying capacity than the injection temperature. The viscosity is an important factor to determine the particle carrying capacity of foam fluid when other conditions are unchanged. [ABSTRACT FROM AUTHOR]

During the lifting process of heavy oil, the temperature and pressure in the wellbore decrease due to the change of ground temperature, resulting in an increase in viscosity and precipitation of dissolved gas, which eventually leads to waxing of oil and blockage of oil wells. As a cost-effective oil recovery process, the continuous hot water circulation heating process in the hollow sucker rod can effectively prevent heavy oil from waxing in the well bore. Under the premise of meeting the production requirements of heavy oil wells, in order to optimize the penetration depth of the continuous pipe, the investment cost is reduced. A two-dimensional axisymmetric steady-state model of the wellbore heating temperature field is established, and the depth of the different continuous tubes is selected to calculate t he temperature distribution in the well bore. The studies have shown that different penetration depths of continuous tubes have a greater impact on well bore temperature; the depth of 700~1200 m under the continuous pipe can meet the requirements of anti-wax and viscosity reduction, and the continuous pipe can be deep down to 700 m to maximize cost savings. [ABSTRACT FROM AUTHOR]