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Mechanical analysis method for bottom drilling tool assembly with bend

A bottom hole assembly and analysis method technology, applied in the direction of instruments, electrical digital data processing, geometric CAD, etc., can solve problems such as inaccurate calculations

Active Publication Date: 2020-07-28
YANGTZE UNIVERSITY +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Mechanical analysis method for bottom drilling tool assembly with bend
  • Mechanical analysis method for bottom drilling tool assembly with bend
  • Mechanical analysis method for bottom drilling tool assembly with bend

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Embodiment Construction

[0069] combined with Figure 1-8 The present invention is further described:

[0070] A method for mechanical analysis of a bottom hole assembly with an angle, comprising the following steps:

[0071] 1. Simplify the BHA with curved corners:

[0072] The following assumptions are made for BHAs with bends: the variation between BHAs with bends

[0073] The shape is a 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 axis of the borehole; the well wall is regarded as rigid

[0074] The diameter of the wellbore is the outer diameter of the drill bit and there is no change in the size of the wellbore; the point contact between the stabilizer and the well wall.

[0075] 2. Body mechanics analysis of bottom hole assembly with curved angle:

[0076] 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 cen...

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Abstract

The invention relates to a mechanical analysis method for a bottom drilling tool assembly with a bend, and belongs to the technical field of oil and gas drilling tools. The method capable of accurately processing the screw bend is provided for solving the problem that the bottom drilling tool assembly has the bend during modeling of the bottom drilling tool assembly with the bend, and the problemthat at the present stage, due to the fact that the bottom drilling tool assembly has the bend or multiple bends, mechanical calculation is inaccurate can be solved. 2, an integral mechanical model ofthe bottom drilling tool assembly with the bend is established based on an infinitesimal method and a continuous beam theory, and a MATLAB software programming calculation method is applied, so thata deformation equation of the bottom drilling tool assembly with the bend can be quickly solved, and a corresponding deformation diagram, a corner diagram, a bending moment diagram and a shearing force diagram are obtained.

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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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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