Multi-body dynamic quick analysis modeling method for rotary steering drilling system

Abstract

The invention relates to a multi-body dynamic quick analysis modeling method for a rotary steering drilling system. The method comprises the following steps of: (1) establishing a structural unit mechanical model according to structural information of the drilling system; (2) establishing constraint models which comprises a speed constraint model, an angular velocity constraint model, a rigid body-beam clamped constraint model and a beam-beam clamped constraint model; (3) establishing an acting force model; (4) establishing a drilling system parameterized model; and (5) importing a computation model file into a multi-body dynamic simulation program to perform dynamic analysis of the drilling system so as to finish modeling. Since the mechanical model of the drilling system is established on the basis of a multi-body dynamic basic principle, rotary motion and dynamic analysis of rotary steering whole well drill string system are realized, and a well bore path is dynamically predicted. The method can be widely applied to the fields of oil-gas fields and coal bed methane exploitation.

Description

technical field [0001] The invention relates to a modeling method, in particular to a multi-body dynamics rapid analysis modeling method of a rotary steerable drilling system. Background technique [0002] In directional drilling, rotary steerable technology has significant advantages over other directional control technologies. The Rotary Steerable System (RSS: Rotary Steerable System) completely abandons the traditional slide-steering method, and automatically, continuously and flexibly adjusts the well deviation and azimuth while the drill string is rotating, which greatly improves the drilling speed and safety. Trajectory control has high precision, which is a guiding method to meet the development needs of closed-loop automatic drilling. RSS has yielded benefits in many field applications worldwide, however the surface driven and steerable driven approach of RSS has also resulted in increased drilling problems. The use of RSS has brought about a major problem, that is...

AI Technical Summary

Problems solved by technology

[0005] At present, the development of rotary steerable tools in my country still adopts the traditional design method, that is, the cycle of product design-prototype development-test-modification design-prototype manufacture-test, each link is accompanied by the design, manufacture and test of the physical prototype , long R&D cycle and high R&D cost

However, it is difficult to study the mechanical characteristics of the rotary steerable drilling system and the prediction and control of the wellbore trajectory under complex conditions with the existing sliding steerable drilling and traditional drill string dynamics theory and analysis methods.

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