Research On Easy Inclined Strata Impact On The Drilling Rate And Measures Of Anti-deflection

In drilling engineering,from overall observation almost not all finished drilling's the borehole trajectory is vertical. Many factors caused by this situation, especially in strata structure complex areas, produce well deflection Angle is larger which lead to slow penetration rates and drilling costs increased quickly. Even because of wells body structure gravely deviates from design rail and cannot finish initial exploration and development purposes. In subsequent production technology accidents, such as sucker rod breaking a leak, lifter, tube, and damage etc closely related well deflection. At the end of 19th century, Drilling workers and scientific and technical staff began researches on reasons which produce well deflection and prevention measures. Up to now designed many prevent inclined measures aimed at preventing in different parts. Although some control measures has certain effect to prevent inclined and rectifying inclined, but also sacrificed drilling speed. For example pendulum assembly in rectifying inclined process need small bit weight, increased drilling total time and the drilling cost, affected well construction cycle, so the contradiction must be solved between inclining prevention and play fast. In HaiTa area, its rock layer is complex, so to solve the problem about preventing inclined or playing fast in HaiTa area, it need to find a both economical and practical prevent inclined measure to enhance the oblique penetration rate.This paper firstly discusses the rock properties in research, on the elastic-plastic theory basis and combining with finite element analysis method, using the finite element analysis software ABAQUS, established the dynamics of drill-rock interaction finite element model. To Su 42 based on actual drilling parameters, combined with sophomore year section rock characteristics, analyses the interaction with the rock and drill, calculated the displacement and drill bit, to provide the theory basis which prove the composite drill has the vortex move, prevent inclined function.Through the comparative analysis of the big grinding turn the drilling rock record can get the average rate of penetration in composite drilling is faster than in turntable role, but relative to the other rock of drilling speed is also lower, there is a need to further improve the low penetration rate, and low the drilling costs.Finally discussed the conventional prevent inclined measures prevent inclined mechanism and modern vertical drilling technology, based on this analysis of the oblique ability design drill. For the application of prevent inclined measures in HaiTa area's easy inclined strata, and puts forward the application of inclined measures scheme, by composite PDC bit, use eyeful drill combination principle to put the appropriate lifter in drilling tools bottom, and combine the composite drilling to drill.