Flow Control Device Design And Deployment Research In Heavy Oil Thermal Recovery Horizontal Wells

Due to the heterogeneity of heavy oil reservoirs,the "heel-toe effect" of long horizontal wells,deviation of wellbore trajectories and reservoir interlayers,problems such as coning,uneven inflow profiles,uneven development of steam chambers,poor thermal development effects,and low recovery rates may occurred.ANSYS Fluent was used to conduct CFD simulation analysis on the inside of the flow control device.The application effect of the flow control device in the thermal production horizontal well in heterogeneous heavy oil reservoirs,wellbore trajectory deviations reservoirs and interlayers reservoir was studied by CMG simulation.The following conclusions have been obtained:Through ANSYS Fluent,the internal temperature field,pressure field,flow field,turbulence intensity and turbulent kinetic energy distribution of the flow control device were simulated when the fluid was pure water phase,pure oil phase,pure gas phase,oil-water two-phase.Obtain the law that the flow control device could provide different pressure drops for different fluids.By analyzing the pressure difference between the inlet and outlet of the fluid flowing through the device at different flow rates,it was obtained that the higher the flow rate,the higher the pressure drop provided.The application effect of the flow control device in the thermal recovery horizontal well of heterogeneous heavy oil reservoir was simulated by CMG.The simulation results showed that in heterogeneous reservoirs,high-permeability zones were prone to steam coning,steam chambers were developed first,and the oil production of high-permeability zones was much greater than other horizontal sections.After the flow control device was deployed in the corresponding well section,steam coning was effectively suppressed.It could restrict the inflow of the high-permeability strip and promote the inflow of other horizontal sections.The inflow profile of horizontal wells was more balanced,and the steam cavity developed more uniformly.The deployment of flow control devices could reduce steam consumption by 50%,increase cumulative oil-steam ratio by 15.9%,and increase cumulative oil production by 15%.The application effect of the flow control device in the thermal recovery horizontal well of the wellbore trajectory deviations reservoir was simulated by CMG.In the case of large deviations in local wellbore trajectories,steam coning was likely to occur in the well sections with close horizontal well spacing.The completion of the flow control device could provide additional pressure drop,limit the inflow near the well section,and balance the pressure distribution of the horizontal well.The deployment of flow control devices could increase the cumulative oil-steam ratio by 28% and the cumulative oil production by 22%.The application effect of the flow control device in the thermal recovery horizontal well in the interlayer reservoir was simulated by CMG.Steam coning was prone to occur in the horizontal well section close to the interlayer,which inhibited the development of steam chambers and caused steam loss.After the flow control device was deployed in the corresponding wellbore section,steam coning was effectively suppressed and the steam chamber developed to other well sections.Balanced the steam distribution in the horizontal well section.Studies had shown that it could increase the daily oil production rate,cumulative oil production and increase the cumulative oil-steam ratio.