Double-pipe deflector tool for multilateral well completion
Multilateral well drilling and completion technologies present such characteristics as efficient utilization of well slots and enhanced oil recovery.However,accurately controlling the friction during the insertion and extraction of the double-pipe deflector in multilateral well completion presents one challenge.To address this issue,a double-pipe deflector tool was developed for multilateral well completion,enabling simultaneous reinsertion and sealing of production strings in both the original hole and the branch hole.A three-stage finite element simulation model was established to analyze the insertion and extraction processes of the deflector tool in the reconnecting sleeve.Furthermore,the effects of the friction coefficient,the separation angle between the main and lateral wellbores,and the bias azimuth of deflector on insertion resistance,extraction resistance,and equivalent stress were analyzed.The influence of friction coefficient on maximum equivalent stress is slightly,while greater on travelling resistance.The separation angle between the main and lateral wellbores influences the maximum equivalent stress and travelling resistance greatly.The influence of bias azimuth on maximum equivalent stress is slightly,while greater on travelling resistance.Thus,smaller bias azimuth had better be maintained during operation,which is suggested within 45°.The performance of the tool was verified through ground test and experimental well test.The results show that the numerical model and analysis method developed effectively simulate the insertion and extraction processes of the deflector tool.Compared to traditional simplified methods,the error in resistance calculated is reduced to 13%from 55%,and the production rate of the experimental well is increased by 50%compared to neighboring wells.This finding validates the effectiveness of the tool,which provides a technical support for the design and operation of multilateral well tools.
万方数据
维普
