A Mechanics Analysis Method of Discontinuous Pointing Rotary Steerable BHA
A technology of rotary steering and drilling tool assembly, which is applied in the field of oil and gas drilling, can solve problems such as discontinuity and nonlinear uncertain contact problems that are difficult to deal with in finite element simulation modeling, and achieve faster mechanical analysis time, lower costs, and higher The effect of promoting value
Active Publication Date: 2022-04-12
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vertical and horizontal bending method can only deal with single variable stiffness and continuous problems, and it is no longer applicable to multi-stiffness and discontinuous problems, and finite element simulation modeling is difficult to deal with discontinuous and nonlinear uncertainties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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[0073] 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.
[0074] A mechanical analysis method for a discontinuous pointing rotary steerable drill tool assembly, characterized in that it includes the following steps:
[0075] (1) Establishment of mechanical model of discontinuous pointing rot...
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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. The present invention adopts the idea of micro-element method and finite element method, and first deduces the formulas of the six connection modes, then uses programming software (Matlab) to perform auxiliary calculations, and finally conducts mechanical analysis. Compared with the existing methods and models, this method can better solve the multi-stiffness, discontinuity and nonlinear contact problems of the discontinuous pointing rotary steerable drilling tool assembly. It has high promotional value. This greatly speeds up the mechanical analysis time of the discontinuous pointing rotary steerable drilling tool assembly, and also reduces the cost of personnel. It provides a theoretical basis for the prediction of the wellbore trajectory, and also provides support for the structural optimization of the pointing rotary steerable and the evaluation of the parameters of the bottom hole 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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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