Spiral tooth v-shaped anti-eccentric wear coupling

Abstract

The invention provides a spiral tooth V-shaped anti-bias grinding joint hoop, which can prevent the abrasion between an oil tubing string and a joint hoop and can be used for prolonging the maintenance-free period of an oil gas well. The spiral tooth V-shaped anti-bias grinding joint hoop mainly comprises an upper internal thread joint, a lower internal thread joint, a table shoulder, a rear cone, spiral teeth, a main cone body and a front sphere; the rear cone adopts a 90-degree conical structure and avoids the rapid change of the section and rigidity of a base body; the unique V-shaped structure of the main cone body forms a converged wedge-shaped gap to generate a dynamic pressure liquid film and enable the anti-bias grinding joint hoop to be separated from an oil pipe wall; the special structure of the tooth surfaces of the spiral tooth and a V-shaped spiral tooth sleeve are combined to form the continuous stable dynamic pressure liquid film again, so the dynamic pressure liquid film formed at the conical surface of the main cone is thickened, the oil tubing string and the joint hoop are completely separated and bias grinding is eliminated; well fluid in the annular space of the rod pipe is continuously stirred by the V-shaped spiral structure of the spiral tooth sleeve, so sand particles are favorably discharged out of the well; the well fluid is enabled to form the continuous stable flows and the dynamic pressure liquid film at the conical surface of the main cone is protected due to the spherical structure of the front sphere.

Description

technical field [0001] The invention relates to a downhole mechanical appliance for preventing contact and friction between a tubing string and a sucker rod coupling during oil and gas well suction operations, in particular to an anti-eccentric wear joint for preventing coupling wear and prolonging the repair-free period of oil and gas wells. hoop. Background technique [0002] At present, the development of most oil and gas fields in my country has entered the middle and late stages. Phenomena such as heavy oil and high water content are very common, and the problem of eccentric wear between the tubing string and the coupling in the rod suction system is becoming more and more serious. [0003] The most direct cause of eccentric wear of the coupling is the contact between the tubing string and the coupling in the pumping operation of oil and gas wells, which is the most direct cause of eccentric wear. Transfer the eccentric wear between the tubing string and the coupling t...

AI Technical Summary

Problems solved by technology

[0005] In order to effectively solve the problem of eccentric wear between oil and gas well tubing strings and couplings and overcome the shortcomings of existing anti-eccentric wear technologies and methods, the purpose of this invention is to provide a new type of anti-eccentric wear coupling for the first time, that is, to develop and apply to Spiral tooth V-shaped coupling for anti-eccentric wear in oil and gas wells

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