Mechanical analysis method of push-type rotary steering drilling tool assembly
A drilling tool assembly and rotary steerable technology, which is applied in directional drilling, instrumentation, electrical digital data processing, etc., can solve problems such as variable section of drilling tool assembly that cannot be solved
Active Publication Date: 2020-07-17
YANGTZE UNIVERSITY +1
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Problems solved by technology
[0007] The purpose of the present invention is to provide a mechanical analysis method that can solve the problem of variable cross-section of the push-on rotary steerable drilling tool assembly that cannot be solved by the existing mechanical models and methods
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Embodiment 1
[0135] Embodiment 1: Static push-back rotary steerable drilling tool assembly structure and related parameters are: Φ215.9mm PDC drill bit
[0136] +Φ197mm rotary guide tool+Φ187mm drill collar+Φ212mm stabilizer+Φ135mm flexible nipple+Φ171.45mm non-magnetic drill collar.
[0137] The static push-on rotary steerable BHA contains 5 places of variable stiffness (B, C, E, F, H), and the specific parameters are as follows in Table 1:
[0138]
[0139] Embodiment 1 is analyzed using the mechanical analysis method of the present invention, and the steps are as follows (see the description attached
[0140] Figure 6 ):
[0141] (1) Reasonable simplification and equivalent treatment of the push-by rotary steerable drill tool assembly;
[0142] It is assumed that the deformation of the push-on rotary steerable drilling tool assembly including the drill bit, rotary steerable tool, stabilizer, flexible joint, and drill collar is an elastic small deformation; the diameter of the bor...
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The invention belongs to the technical field of petroleum drilling tools, and particularly relates to a mechanical analysis method of a pushing type rotary steering drilling tool assembly. According to the method, when the mechanical model is established for the push-type rotary steering drilling tool assembly, the problem of multiple different rigidities among the drill strings is considered, thepush-type rotary steering drilling tool assembly with infinite rigidities can be processed according to the real situation, and the analysis result is closer to the real situation. 2, a mechanical analysis model of the pushing type rotary steering drilling tool assembly is established by utilizing an infinitesimal method and a continuous beam theory, a deformation equation of the drilling tool assembly can be solved, and a corresponding displacement curve, a corner curve, a bending moment curve and a shearing force curve are obtained; 3, the influence rule of different factors on the lateralforce of the drill bit of the push-type rotary steering drilling tool assembly is analyzed; the structural parameters of the pushing-leaning type rotary steering drilling tool assembly are optimally designed according to the obtained rule so as to improve the lateral force of a drill bit of the pushing-leaning type rotary steering drilling tool assembly, and therefore the research thought providedby the invention provides a design theoretical basis for improving the deflecting capacity of a pushing-leaning type rotary steering drilling tool. The method can be widely applied to the field of oil-gas field and coalbed methane development.
Description
technical field [0001] The invention belongs to the technical field of petroleum drilling tools, and in particular relates to a mechanical analysis method of a push-on rotary steerable drilling tool assembly. Background technique [0002] In the process of directional drilling, the push-by rotary steerable drilling tool assembly can conveniently adjust the well deviation and azimuth while the drill string is rotating, and complete the drilling work such as directional deflection build-up, deflection increase and deflection stabilization, thus greatly improving the directional The efficiency and safety of drilling make the well trajectory control precision high, and are widely used in complex drilling processes such as directional wells, horizontal wells and horizontal lateral wells. [0003] The force and deformation analysis of the push-on rotary steerable drilling tool assembly is an important theoretical basis for optimizing the structural design of the push-on rotary ste...
Claims
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IPC IPC(8): G06F30/20E21B7/06G06F119/14
CPCE21B7/06
Inventor 夏成宇陈锟范宇吴鹏程王旭东钱利勤黄剑
Owner YANGTZE UNIVERSITY