COMPUTER SIMULATION OF CASING DEFORMATION

According to the elastoplastic finite element method the computer imitation software of the casing deformation has been written.Using this software,an uniform or non uniform force acting on casing can be easily imitated and the process of elastoplastic deformation can be observied.It is a new method in the casing deformation reaserch.The paper first put forward the new concept and expression for casing compressive strength under non uniform force,so it may compare the decreased degree of the compressive strength with that of uniform load acting on casing.Running the software of casing deformation,an effective method of resisting non uniform load on casing Pipe-in-Pipe combination is found,it is being applied at present in Huabei oil field.