Method for Determining Limit Working Torque of Double Shoulder Tool Joint

Abstract

The embodiment of the invention provides a determining method of the limit operating torque of a double-shoulder drilling tool joint. The determining method comprises following steps of obtaining the limit operating torque calculation model of the double-shoulder drilling tool joint according to the structure parameters of a to-be-measured double-shoulder drilling tool joint; obtaining the limit operating torque corresponding to each preset axial tension of the double-shoulder drilling tool joint according to the limit operating torque calculation model, wherein there is at least one axial tension, the axial tension and the limit operating torque are in one-to-one correspondence. According to the method of the invention, the limit operating torque calculation model is obtained according to accurate measurement and calculation of the double-shoulder drilling tool joint; the actual stress distribution features can be reflected fully; the limit operating torque of the double-shoulder drilling tool joint can be determined accurately; and the accidents resulted from drilling tool joint failures in drilling processes can be effectively reduced.

Description

technical field [0001] The embodiments of the present invention relate to the fields of petroleum engineering and machinery, in particular to a method for determining the limit working torque of a double-shoulder drill joint. Background technique [0002] Drilling tools are the main tools used to transmit power and transport drilling fluid, especially in the process of drilling in oil and gas fields. With the increase in the number of deep wells, ultra-deep wells, and extended-reach horizontal wells year by year, drill tool joints, especially drill pipe joints The torsional performance of drilling tools has received more and more attention, so drilling tool failure accidents will bring huge economic losses. [0003] In the prior art, the commonly used methods for evaluating the service performance of drilling tools include the following two methods: The first method provides the calculation of the torsional strength of the drill pipe joint based on the assumed complex load c...

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Problems solved by technology

[0005] The embodiment of the present invention provides a method for determining the limit working torque of the double-shoulder tool joint, so as to solve the problem that the actual stress distribution characteristics cannot be fully reflected in the prior art, and the limit working torque of the double-shoulder tool joint cannot be accurately determined. As a result, there are a large number of safety accidents caused by the failure of the drill tool joint during the drilling process.

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