| As the cutting-edge technology for oilfield development in the world today,intelligent well technology is one of the important technologies to improve oil recovery,optinize reservoir management and realize economic and efficient development of oil and gas fields.Through the literature research on the development status of smart well technology and intelligent well flow control valve flow control technology at home and abroad,it is found that domestic research on smart well technology is still in its infancy compared with foreign advanced intelligent well technology,and many studies still remain in the research.In the theoretical research and experimental phase of the laboratory,relatively mature intelligent well system equipment has not yet appeared.Based on the research on key technologies of deepwater intelligent completion downhole flow control in the 13th Five-Year National Science and Technology Major Project,this paper firstly analyzes the intelligent well technology of several oilfield service companies abroad,and first establishes the intelligent well flow control valve.The flow model of the first production layer and the second production layer in the underground is used to derive the calculation formula of the flow control valve output calculation formula and the flow control valve integrated flow coefficient,and the flow control valves of four different flow path structures are respectively solved.The flow rate under different pressure difference and the theoretical value of the integrated flow coefficient,secondly,the numerical simulation of the internal flow channel of the flow control valve is carried out,and the flow field distribution result of the flow control valve is obtained,fron which the flow control valve outlet flow and comprehensive are obtained.The simulation results of the flow coefficient are used as a comparison of the theoretical solution results.Subsequently,the rationality of the simulation results is verified by the calculation of the boundary layer grid,the grid independence verification and the experimental comparison.In addition,the flow field is also solved.Results the erosion control of the flow control valve was carried out to solve ordinary carbon steel and tungsten carbide.The erosion rate and erosion of gold,silicon carbide ceramics and tungsten carbide metal obtained the comparison of erosion resistance of four materials,and the,naterials with the best erosion resistance were selected,and four different structures were selected.The erosion analysis of the flow channel shows that the stepless speed control flow control valve has additional erosion wear effect on the throttle valve sleeve at the intermediate opening degree,which provides a structural optimization for the stepless speed control flow control valve.The new idea and the erosion rate at different slope angles at the entrance of the orifice are obtained,and the conclusion that the erosion resistance is optimal when the groove angle is 35 degrees is obtained,and the sand grains of different sizes are also obtained.The erosion under the diameter was studied.The results of the erosion rate increase whcn the grain size is larger than 250 microns are obtained,which provides a reference for the design of the downhole sand control device.In addition,based on the solution results of the flow field,the flow-solid coupling analysis of the flow control valve is carried out,and the deformation and stress distribution of the flow control valve during the fluid inflow process are obtained.The mechanical strength of the flow control valve under the action of the fluid is checked.Finally,based on the configuration the flow field inside the flow control valve is optimized.The flow field inside the flow control valve is more stable by opening the steady flow hole.The optimized flow rate increases to 26 times the growth rate of the orifice flow area the above. |
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