Optimization Design of Sucker Rods for Directional Wells with High Pour Point Crude Oil

At present, the crude oil in the newly put into production block of Y Oilfield has a high gum and wax content, and directional wells account for more than 90% of the total number of oil wells. The wellbore structure of directional wells leads to complex mechanical effects of the rod string, making it difficult to accurately predict the hanging point load of the pumping unit, resulting in unreasonable design of the rod string in newly put into production oil wells. The phenomenon of eccentric wear and rod breakage of the pumping rod often occurs. In order to improve the scientificity of sucker rod design for directional wells with high pour point crude oil, a computational mathematics model for calculating wellbore temperature field of high pour point crude oil electric heat tracing viscosity reduction process was established using the basic theory of heat transfer, the distribution of viscous force on sucker rod was analyzed, the influence of well deviation on suspended point load was considered, and the technical method for axial maximum and minimum load of sucker rod in directional wells was given. According to the modified Goodman diagram, the reasonable rod string combination for directional wells was optimized, Make the lifting plan design of directional wells more reasonable and scientific.