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Design and Mechanical Analysis of Multilateral Well Tieback and Deflector Equipments

Author: ZhangZuo
Tutor: LiuJuBaoï¼›LuoMin
School: Daqing Petroleum Institute
Course: Engineering Mechanics
Keywords: Branch wells Tieback device Reentrant device Finite Element Nonlinear Contact analysis
CLC: TE242
Type: Master's thesis
Year: 2006
Downloads: 346
Quote: 2
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Abstract


Branch well designed according to the actual downhole conditions tieback and re-entry device , the tieback design and re-entry device structure model to determine the major mechanical problem to be solved . Reentrant device , load transfer between the sleeve threaded connections to achieve this end, the establishment of a reentrant device connecting thread preload mechanical model , deformation coordination equation derived pretension role connecting thread special program prepared by the Delphi software calculated the approximate solution , so as to carry out the screw threads , stress analysis and strength of threaded joints and contact with the end face of the check and laid the foundation for this new type of connection thread structure design and parameters preferred to provide a theoretical basis . In addition , the finite element analysis model of the double casing nonlinear the the the oval casing tieback device molding nonlinear finite element computation model and downhole branch . Nonlinear elastic-plastic deformation characteristics oval casing , the application of the finite element analysis software ANSYS using two different methods , the round casing in a non- uniform deformation under load and stress state , and to determine the casing very small the material N80 steel plastic deformation amount of springback deformation . Dual nonlinear problem of double casing tieback device underground branch of the non - linear theory , a novel , reasonable contact nonlinear finite element model is constructed with ANSYS platform , basically solved the double-layer sleeve contact design calculations . Prepared special program , making the oval sleeve forming a finite element model and double casing contact nonlinear finite element model , modeling , solving parameters , automation , dedicated post-processing programs used in ANSYS , can facilitate the draw items to the stress and displacement curve chart , back to the branch well received, and re-entry device is designed to provide a reference .

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