Design And Mechanical Analysis Of Multilateral Well Tieback And Deflector Equipments

Based on system research of multilateral well tieback and deflector equipments'working conditions, the author designed a structure model of tieback and deflector equipments,and primary mechanic problems are fixed on.Since connecting thread of the deflector equipment transfers loads, the mechanicalmodel of the connecting thread is set up. Meanwhile a compatibility equation of connectingthread under make-up torque and axial load is derived. By solving the equations, stress andstrength analysis of teeth, connecting part and contacting surface of connecting thread is studied.And it can provide the reference for designing and optimizing parameters of this new type ofthread. In order to ascertain the configurations of tieback equipments, the finite elementanalysis models of ellipse casing forming simulation and double-layer casing are established.Making using of exercise FEA software ANSYS, the nonlinear deforming abilities of ellipsecasing is investigated through two different methods. By this way, deformation and stress stateof round casing subjected to non-uniform distributed loading is presented, and it is found outN80 grade casing steel has small spring back. Moreover, discusses the double nonlinear problem ofdouble-layer casing of tieback equipments, when it is forming two branches in borehole. Thenwe use ANSYS to construct a kind of novelty and logical finite element contact model ofdouble-layer casing, basically settle the design and calculate of double-layer casing contactmodel.The author workouts special programs make design parametric and automatic. Makinguse of post program can get stress and displacement curve convenient and give the reference ofmultilateral well tieback and deflector equipments design.