Test device and method for mechanical characteristics of simulation bottom hole assembly

Abstract

The invention relates to a test device and method for mechanical characteristics of a simulation bottom hole assembly, and belongs to the technical field of pipe string mechanical testing. The device comprises a simulation bottom hole assembly system, a driving system, a control system, a measuring system and a hoisting system, and is mainly composed of a test stand, a test bed, a hydraulic motor, a measuring and control instrument, a motor, an eddy current displacement sensor, a force measuring device, a computer, a signal acquisition module, a signal cable, a simulation drill string, a simulation wellbore, a wirerope and the like. The test method includes determining geometrical dimensions of the simulation drill string and the wellbore according to a similarity theory, subjecting the simulation drill string to stress calculation and designing the sensor according to a calculation result, hoisting the test bed to be at a needed hole drift angle through the hoisting system, loading an axial displacement and rotation speed to the simulation drill string through the driving system and the control system, and measuring axial force, lateral force and rotation angle of a simulation drill and a whirl motion law of the simulation drill string through the measuring system. According to the test device and method for the mechanical characteristics of the simulation bottom hole assembly, research quality of the mechanical characteristics of the simulation bottom hole assembly can be improved.

Description

technical field [0001] The invention belongs to the technical field of pipe string mechanics testing, relates to a test device for simulating the mechanical characteristics of a bottom hole assembly, and also relates to a test method using the test device, which is used to simulate the axial direction of a drill bit during rotary drilling. Force, lateral force, rotation angle and radial motion trajectory at different positions of the drill string are measured. Background technique [0002] In the process of petroleum exploration and development, drilling is an essential and basic link, which is characterized by capital and technology-intensive. The study of drill string mechanical properties is an important part of modern drilling engineering theory and technology. With the development of drilling technology in the direction of high temperature and high pressure wells, deep wells and ultra-deep wells, special process wells (including directional wells, horizontal wells, ext...

AI Technical Summary

Problems solved by technology

However, there are differences between the simulated bottom drill string and the actual steel drilling tool in this test device, and it is not possible to conduct comparative tests under various inclination angles

In 2008, Chinese patent 200810239189.4 proposed a measurement system for simulating the dynamic force of the bottom drill string, but only simulated the drill pipe and stabilizer without simulating the drill bit, and the end of the drill bit was fixed, which is different from the drill bit in the actual drilling process. The actual situation of the hinge support does not match

[0006] Surface measurement does not need to consider various complex conditions downhole, the structure design is relatively simple, and on-site installation is convenient, but this method requires accurate and appropriate processing of the boundary conditions of on-site testing

Images