Mechanical analysis method of discontinuous directional rotary steering drilling tool assembly
A rotary steering and drilling tool assembly technology, applied in the field of oil and gas drilling, can solve the problems that finite element simulation modeling is difficult to deal with discontinuity and nonlinear uncertain contact problems.
Active Publication Date: 2020-07-17
YANGTZE UNIVERSITY +1
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[0004] In summary, the limit of vertical and horizontal bending method can only deal with single variable stiffness and continuous problems, and it is no longer applicable to multi-stiffness and discontinuous problems, and finite element simulation modeling is difficult to deal with discontinuous and nonlinear uncertainties contact problem
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[0080] This method mainly includes: ① establishment of mechanical model of discontinuous pointing rotary steerable drilling tool assembly and a direct calculation formula derivation; ② displacement, rotation angle and bending moment in discontinuous pointing rotary steerable drilling The establishment of the formula of shear force; ③The treatment of various connection methods in the discontinuous pointing rotary steerable drilling tool assembly; ④The determination of the length of the sixth section in the discontinuous pointing rotary steerable drilling tool assembly; ⑥Establishment of the equations of each segment in the non-continuous pointing rotatable steerable drilling tool assembly; Figure 1-8 The present invention is further described.
[0081] A mechanical analysis method for a discontinuous pointing rotary steerable drill tool assembly, characterized in that it includes the following steps:
[0082] (1) Establishment of mechanical model of discontinuous pointing rot...
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The invention relates to the field of oil and gas drilling, in particular to a mechanical analysis method of a non-continuous directional rotary steering drilling tool assembly. According to the method, ideas of a micro-element method and a finite element method are adopted, formulas of six connection modes are derived, auxiliary calculation is conducted through programming software (Matlab), andfinally mechanical analysis is conducted. Compared with an existing method and model, the method can better solve the multi-rigidity, non-continuity and non-linear contact problems of the non-continuity directional rotary steering drilling tool assembly; the popularization value is high. Therefore, the mechanical analysis time of the non-continuous directional rotary steering drilling tool assembly is greatly shortened, and the personnel cost is also reduced. A theoretical basis is provided for prediction of a well track, and a support is provided for structural optimization of directional rotary steering and evaluation of all parameters of a bottom drilling tool assembly.
Description
technical field [0001] The patent of the present invention relates to the field of oil and gas drilling, in particular to a mechanical analysis method of a discontinuous pointing rotary steerable drilling tool assembly. Background technique [0002] Pointing rotary steerable drilling tools represent the development trend of advanced drilling tools at present, while discontinuous pointing rotary steerable drilling tool assemblies are used in ultra-deep wells, high-difficulty directional wells, cluster wells, horizontal wells, extended-reach wells and lateral wells. It is more widely used in special craft wells. These special wells have high requirements on drilling accuracy, wellbore trajectory quality, drilling speed and efficiency, etc., so the mechanical analysis of discontinuous pointing rotary steerable drilling tool assembly is particularly important. The discontinuous directional rotary steerable drilling tool assembly includes a drill bit, a lower stabilizer, an ecce...
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Login to View More IPC IPC(8): G06F30/20E21B7/04G06F119/14
CPCE21B7/04
Inventor 夏成宇王志亮范宇吴鹏程王旭东钱利勤黄剑
Owner YANGTZE UNIVERSITY