The Research On The Simulation Of Gas Pipeline Crossing By Directional Drilling Technology

It is a practical engineering project to research on the Simulation of gas pipeline crossing by Directional Drilling Technology, of which the purpose is to finish the simulation of pipeline crossing the river.The project will analyze the mechanical property of the technology of gas pipeline crossing river, and provide the important theory technical supports.This paper,fist of all,describes the characteristic, the system composition, and the construction procedure of Directional Drilling Technology.The design of the crossing curve and the calculation of the pull-back loading are theoretically analyzed.Secondly, the theory of the project contact problem and its finite element solution are analyzed.Several typical finite element equation are given, meanwhile, this paper studies the contact module of ANSYS, analyzes the contact element and face to face method, and summarizes the steps of the solid contact simulation by ANSYS.Thirdly, A finite element simulation module of pull-back pipeline in directional drilling is established.On this base, finite element simulation of pull-back pipeline which is under different parameters , such as crossing curve radius, penetration angle, excavate angle, caliber, wall thickness, and crossing rock strata ,is accomplished.At the same time, the changes of the pipeline mechanic property are summarized.Moreover, theory analysis of the curve strain about pipeline under gravity is finished, and the relationship between pipeline length and curve strain is obtained.Finally, according the given principle and the change of pull-back force, pipeline stress, pipeline contact stress, and contact press, the optimal values of the key parameters about Directional Drilling Curve are taken.Thus, this paper accomplishes the optimization value of the Directional Drilling Curve.