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Method for quickly evaluating torsional property of degraded drill rod connector

A technology of drill pipe joint and evaluation method, which is applied in the field of oilfield drilling

Inactive Publication Date: 2017-01-11
SHANGHAI UNIV
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  • Application Information

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Problems solved by technology

[0005] Aiming at the problems existing in the current method for evaluating the mechanical properties of downgraded drill pipe joints under complex load conditions, the purpose of the present invention is to provide a method for evaluating the torsional performance of downgraded drill pipe joints to ensure the safe use of downgraded drill pipe joints

Method used

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  • Method for quickly evaluating torsional property of degraded drill rod connector
  • Method for quickly evaluating torsional property of degraded drill rod connector
  • Method for quickly evaluating torsional property of degraded drill rod connector

Examples

Experimental program
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Embodiment

[0031] Example: A rapid evaluation method for the torsional performance of a degraded drill pipe joint is used to determine the torsional strength of a degraded drill pipe joint.

[0032] Using this evaluation method to evaluate a degraded drill pipe joint, the main parameters measured are shown in Table 1.

[0033]

[0034] Use CAD geometric modeling software to establish a three-dimensional geometric model of the downgraded drill pipe joint, such as figure 2 shown. Use the finite element pre-processing software to mesh the degraded drill pipe joint, and establish its three-dimensional finite element model, as shown in image 3 shown.

[0035] The material used for the drill pipe joint is isotropic elastic-plastic material, and the measured elastic modulus is 2.06×10 5 MPa, Poisson's ratio is 0.29, and the true stress-plastic strain data of the material are shown in Table 2. Considering the influence of thread grease containing 40-60% by weight of zinc powder, the coe...

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Abstract

The invention provides a method for quickly evaluating the torsional property of a degraded drill rod connector, and the method comprises the steps: carrying out the grid dividing of a three-dimensional geometric model of the degraded drill rod connector through employing finite-element preprocessing software on the basis of measuring the geometric structure parameters and material mechanics property parameters of the degraded drill rod connector; building a three-dimensional finite element model of the degraded drill rod connector, employing nonlinear finite element analysis software ABAQUS for calculation, and obtaining three-dimensional stress characteristics of the degraded drill rod connector under the action of a complex load; and calculating the torsional property of the degraded drill rod connector on the basis. The method can evaluate the torsional property of the degraded drill rod connector under the action of the complex external loads: make-up torque, axial tension and working torque, and evaluates the safety of the degraded drill rod connector. The system is of great significance to the knowing of the load limit of the degraded drill rod connector, the guiding of the application of the degraded drill rod connector, and the guaranteeing of the safety of drilling operation.

Description

technical field [0001] The invention relates to the technical field of oilfield drilling, in particular to a method for quickly evaluating the torsional performance of a degraded drill pipe joint. Background technique [0002] The drill pipe joint is the weak link of the drill string. It is prone to wear to varying degrees during use, which makes the wall thickness thinner and affects the strength of the joint. The API standard gives the grading basis of the drill pipe body and joints, but does not give the torsional strength of the degraded drill pipe joints. With the number of deep wells, ultra-deep wells and extended-reach horizontal wells increasing year by year, the torsional performance of drill tool joints has received more and more attention. Therefore, there is a great need for a rapid evaluation method that can effectively determine the torsional performance of degraded drill pipe joints. [0003] The experimental method is a reliable method for evaluating the co...

Claims

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Application Information

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IPC IPC(8): G01M13/00
CPCG01M13/00
Inventor 狄勤丰陈锋王文昌冯少波张鹤陈薇
Owner SHANGHAI UNIV
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