A Mechanics Analysis Method for Bottom Hole Assembly with Angle

A bottom hole assembly and analysis method technology, applied in the direction of instrumentation, geometric CAD, design optimization/simulation, etc., can solve problems such as inaccurate calculations, achieve the effects of reducing drilling costs and increasing drilling rates

Active Publication Date: 2022-04-12
YANGTZE UNIVERSITY +1
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  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a mechanical analysis method for BHAs with curved angles, which can accurately process the screwed rod angles, and solve the current problem of BHAs with curved angles or even with multiple curved angles. Inaccurate calculations when performing mechanical analysis

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  • A Mechanics Analysis Method for Bottom Hole Assembly with Angle
  • A Mechanics Analysis Method for Bottom Hole Assembly with Angle
  • A Mechanics Analysis Method for Bottom Hole Assembly with Angle

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Embodiment Construction

[0067] combined with Figure 1-8 The present invention is further described:

[0068] A method for mechanical analysis of a bottom hole assembly with an angle, comprising the following steps:

[0069] 1. Simplify the BHA with curved corners:

[0070] The following assumptions are made for BHAs with bends: the deformation between BHAs with bends is small elastic deformation; the weight on bit acts on the center of the drill bit, and the center of the drill bit is located on the borehole axis; It is a rigid body, the diameter of the borehole is the outer diameter of the drill bit and there is no change in borehole size; the point contact between the stabilizer and the well wall.

[0071] 2. Body mechanics analysis of bottom hole assembly with curved angle:

[0072] Take a micro-element with length dx at any position of the bottom hole assembly beam column with a bend, and establish a coordinate system with the center of the A section as the zero point. The force analysis is a...

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Abstract

The invention relates to a mechanical analysis method for an angled bottom drilling tool assembly, which belongs to the technical field of oil and gas drilling tools. This invention proposes a method that can accurately deal with the bending angle of the screw for the problem of the bottom hole assembly with the angle when modeling the bottom hole assembly with the angle, which can solve the current problem of the bottom hole assembly with the belt. Inaccurate mechanical calculations due to corners or multiple corners. 2. The present invention is based on the micro-element method and the continuous beam theory to establish the overall mechanical model of the bottom drilling tool assembly with a curved angle and the method of programming calculation using MATLAB software, which can quickly solve the deformation of the bottom drilling tool assembly with a curved angle Equation, get the corresponding deformation diagram, rotation angle diagram, bending moment diagram and shear force diagram.

Description

technical field [0001] The invention relates to a mechanical analysis method for an angled bottom drilling tool assembly, which belongs to the technical field of oil and gas drilling tools. Background technique [0002] Bottom hole assembly usually consists of drill bit, screw rod, stabilizer, drill pipe, drill collar and some special joints. Among them, there are two types of common BHAs with curved angles, one is the curved shell drilling tool with structural angles on the screw drilling tool body, and the other is composed of bent joints on the screw drilling tool body Curved Shell Drilling Tools. The former is easy to process and maintain because the corner is on the screw housing, while the latter is more flexible. BHAs with bends are often used for directional operations in horizontal well sections, so mechanical analysis of BHAs with bends in horizontal well sections is required. [0003] Downhole, the bottom hole assembly is deformed under the action of drilling p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20G06F30/17G06F119/14
Inventor 夏成宇黄壮范宇吴鹏程王旭东钱利勤黄剑
Owner YANGTZE UNIVERSITY
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