Research On Key Tools Of Paired Horizontal Well Magnetic Positioning Technology

Heavy oil is an important component of hydrocarbon energy in the world.However,due to its high viscosity and poor fluidity,it is difficult to flow even under reservoir conditions.Therefore,high-temperature steam stimulation,steam flooding and steam assisted gravity drainage(SAGD)are the main methods of heavy oil recovery.Domestic by pilot test confirmed that the SAGD mining way compared with other two kinds of heat recovery is higher,can amount to 60%,the technical implementation method is as follows:it is near the bottom of the reservoir to the location of the drill a horizontal parallel horizontal Wells,the upper horizontal well steam injection,injection steam up overlap in formation formed in the cavity,and constantly expand to the top and side with the crude oil heat exchange,heating oil and steam condensation water discharge to the bottom in the production of horizontal well by gravity,reoccupy lifting method for production.The magnetic guidance measurement technology used to drill SAGD pairs of horizontal Wells is monopolized by several large foreign companies and is very expensive to use.In view of the above reasons,on the basis of previous studies on magnetic guidance technology,this paper carried out research on key tools of horizontal well magnetic positioning technology.The specific research contents are as follows:(1)By collecting domestic and foreign literature on magnetic positioning technology,carefully reading,analyzing and summarizing,on the basis of previous studies,the research on magnetic positioning algorithm was carried out,and the spatial magnetic positioning model was established,According to this mathematical model,the magnetic positioning software was compiled.(2)The structure and parameters of the magnetic source generator are designed,and the strength of its components is checked.The penetrability analysis of the magnetic source generator under different curvature and friction coefficient was carried out,and the pump pressure required for smooth tool entry was calculated by combining the analysis results.Combined with rain-flow counting method,the fatigue analysis and optimization of the structure were carried out to improve the life cycle of the instrument.(3)The analysis and optimization of rubber plug driven by magnetic source generator are completed by finite element simulation.The results show that the maximum equivalent stress can be reduced by increasing the radius of the arcs in the branches.By improving the hardness of the rubber plug and the thickness of the rubber cup,the compression resistance of the rubber cup can be improved.(4)The mechanical structure of the detection system in magnetic positioning technology was studied,and the sealing performance was analyzed under different working conditions.According to the analysis,the higher the pre-compression ratio,the greater the contact stress,which is consistent with the Hertz contact theory,but the increase of the pre-compression ratio will lead to the increase of the stress on O-type sealing ring,so it should be appropriate to choose the pre-compression ratio of the sealing ring.Under different medium pressure,the sealing effect of O-ring under the condition of 15%compression rate is analyzed,and the contact pressure distribution of two contact surfaces along the contact surface path is obtained.To sum up,the key technologies of magnetic positioning in horizontal Wells are formed in this paper through the relevant theoretical research and software compilation of magnetic positioning,the research of magnetic source generator structure and the analysis and optimization of driving rubber plug structure,the research of mechanical components of detection system and the analysis of sealing performance.