Dynamic frictional resistance torque calculating method

Abstract

The invention relates to a dynamic frictional resistance torque calculating method; firstly a finite element value model based on a whole well service tubing string system is built, then boundary conditions are applied on the value model, finally an effective algorithm is employed to calculate and analyze frictional resistance torque received by a service tubing string in a narrow and long well shaft. The dynamic frictional resistance torque calculating method based on the whole well service tubing string system dynamics comprises the following steps: building a whole well shaft and the service tubing string so as to form the finite element grid model; endowing physics attributes on the finite element value model, and defining boundary conditions of the service tubing string; combining a kinetic equation with a tubing string-well shaft interaction model so as to describe a frictional resistance torque equation under tubing string dynamic behavior; using a value algorithm to carry out dynamics calculation for the finite element value model, and extracting frictional resistance torque key parameters for evaluation analysis. The dynamic frictional resistance torque calculating method comprehensively consider tubing string vertical, horizontal and twist three-dimensional coupled dynamics behavior characteristics, can truly reflect real drilling condition of the service tubing string, thus providing reference basis for field drilling well tubing string design, borehole track optimization, and well bore quality control.

Description

technical field [0001] The present invention relates to a dynamic friction torque calculation method, which is based on the dynamic friction torque calculation method of the whole well service pipe string system dynamics, uses the finite element method to simulate and calculate the dynamic behavior characteristics of the service pipe string in complex working conditions in real time, The frictional torque of the pipe string is analyzed and evaluated by parameters such as the axial force, contact force, friction force and torque of the pipe string. The invention can provide reference for drilling design, pipe string combination design, drilling parameter optimization, equipment type selection, real-time monitoring and control of wellbore track quality, and evaluation of the limit extension ability of drilling wells, etc. for on-site construction. The invention can be widely used in the field of petroleum, natural gas and coal exploration and development. Background technique ...

AI Technical Summary

Problems solved by technology

The present invention can also provide solutions for field engineers to solve problems such as drilling design, optimizing pipe string combination, seeking suitable drilling parameters, and optimizing wellbore trajectory.

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