Method for quickly evaluating tensile property of degradation drill rod joint

A technology for drill pipe joints and evaluation methods, applied in special data processing applications, instruments, electrical digital data processing, etc.
CN106339529AInactive Publication Date: 2017-01-18SHANGHAI UNIV
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Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
SHANGHAI UNIV
Publication Date
2017-01-18
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

The invention provides a method for quickly evaluating the tensile property of a degradation drill rod joint. The method comprises the following steps: performing grid division on a degradation drill rod joint three-dimensional geometric model by using finite element pre-processing software on the basis of measuring a geometric structure parameter of the degradation drill rod joint and a mechanical property parameter of a material by using a special tool or facility, building the degradation drill rod joint three-dimensional geometric model, performing calculation by using nonlinear finite element analysis software ABAQUS to obtain a three-dimensional stress characteristic of the degradation drill rod joint under the action of a complicated load. On the basis of the three-dimensional stress characteristic, the tensile strength of the degradation drill rod joint can be calculated. The evaluation method can be used for evaluating the tensile property of the degradation drill rod joint under the action of a complicated external load such as a make up torque and an axial tension so as to evaluate the safety of the degradation drill rod joint. The method has very important significance for recognition of a load limit of the degradation drill rod joint, instruction for the use of the degradation drill rod joint and guarantee of the working safety of drilling.
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Description

technical field

[0001] The invention relates to the technical field of oil field drilling, in particular to a method for quickly evaluating the tensile 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 classification basis for the drill pipe body and joints, but does not give the tensile 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 tensile properties of drill tool joints have received more and more attention. Therefore, there is a great need for a rapid evaluation method that can effectively determine the tensile properties of degraded drill pipe joints.

[0003] The experimental method is a reliable method for evaluating the co...

Claims

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