CN202090853U

CN202090853U - Double-shoulder drilling tool joint structure with stress releasing groove

Info

Publication number: CN202090853U
Application number: CN2011201981054U
Authority: CN
Inventors: 贺培基; 刘海春; 曾浩
Original assignee: BAOTOU FOUND PETROLEUM MACHINERY Co Ltd
Current assignee: FENGDA PETROLEUM EQUIPMENT CO., LTD.
Priority date: 2011-06-01
Filing date: 2011-06-01
Publication date: 2011-12-28
Anticipated expiration: 2021-06-01

Abstract

The utility model relates to a double-shoulder drilling tool joint structure with a stress releasing groove, which comprises a joint and is characterized in that a main shoulder, connecting thread and an auxiliary shoulder are arranged on the joint, the main shoulder and the auxiliary shoulder are respectively arranged at two ends of the connecting thread, the main shoulder is arranged at the larger-diameter end of the connecting thread, and the auxiliary shoulder is arranged at the small-diameter end of the connecting thread. The stress releasing groove is arranged at the root portion of the connecting thread. The double-shoulder drilling tool joint structure has the advantages that the stress releasing groove is arranged at the root portion of the connecting thread so that full buckling height of the tail end of the thread is ensured, stress conditions during joint connection of effectively are improved, and extreme loading resistant capability of the joint is improved. Two shoulders are respectively arranged at two ends of the connecting thread of the double-shoulder drilling tool joint, the main shoulder has the functions of sealing and torsion resistance, the auxiliary shoulder can change integral stress conditions of the thread and a joint connecting face, thereby enabling stress distribution of the thread section to be even, and enabling an integral thread form to bear effects of torsion fundamentally and to be more reasonable in stress.

Description

Two shoulder tool joint structures of band stress relief grooves

Technical field

The utility model relates to a kind of two shoulder tool joint structures with stress relief grooves, belongs to oil, gas drilling field of tool.

Background technology

In oil, gas drilling process, the working condition very severe of drill string, stressing conditions is very complicated, and for common tool joint (separate unit is takeed on unstressed release groove), joint is a link the weakest in the drilling tool, very easily loses efficacy in drilling process.Along with deepening continuously of petroleum resources exploitation, be the direction of the development of drilling well instantly to the probing of bad ground, deep formation, deep-well, ultradeep well and high strength drilling well are had higher requirement to tool joint.Normally used conventional joint design has two kinds, and a kind of is separate unit shoulder belt stress relief grooves, and this kind joint design very easily lost efficacy under strong torsional interaction, causes the down-hole thread gluing easily, expands and detain or the dropout accident; A kind of is two unstressed release grooves of shoulder, this kind joint design has solved the problem of thread failure under strong torsional interaction, but easy skewness of joint sealing face place contact pressure and the big end of the joint engagement first ridge place easily form stress and concentrate, and very easily ftracture herein, fracture failure.Therefore, how tool joint being improved, is to press for finishing of task instantly.

Summary of the invention

The purpose of this utility model provides and a kind ofly can satisfy deep-well, ultradeep well and high strength drilling well requirement, two shoulder tool joint structures of the band stress relief grooves of band stress relief grooves.

The purpose of this utility model realizes in the following manner:

The utility model comprises joint, it is characterized in that: be provided with main shoulder, connecting thread, slave station shoulder on joint, major and minor shoulder lays respectively at the two ends of connecting thread, and main shoulder is at the big end of connecting thread diameter, and the slave station shoulder is at the small end of connecting thread diameter; Root at connecting thread has stress relief grooves.

Described joint is male joint or female joint, and male joint and female joint are mated mutually.

The utility model has the advantages that: the root at connecting thread is opened stress relief grooves, guarantees the complete button height of screw tip, and the stress state in the time of can effectively improving the joint connection effectively improves the ability of the anti-extreme loads of joint.Two shoulders are made at two shoulder tool joint connecting threads two ends respectively, promptly main shoulder and slave station shoulder, main shoulder plays sealing and certain torque resistant effect, the slave station shoulder is to bear pressure one regularly at main shoulder, in order to prevent screw thread fracture thread gluing, one secondary pressure distribution defence line that whole joint expands and detains, threads off and be provided with, can change the whole force-bearing situation of screw thread and even joint contact surfaces, make the stressed distribution of thread segment more even, and make whole tooth form bear twisting force substantially, the tooth form more reasonable stress.In addition, because button shape is identical with the conventional joint of API, so can dock with existing API standard normal joint, interchangeability is not affected, the hydrophthalmia of two shoulder male and female buttons directly docks, and very close to each other or internal diameter varies has been improved the fluid property of suppressing grouting, reduced turbulent influence, made chip removal and well cementation performance more stable.

Description of drawings

Fig. 1 is a male and female connector-fitting structure schematic diagram of the present utility model;

Fig. 2 is a male joint structural representation of the present utility model;

Fig. 3 is a female joint structural representation of the present utility model.

The specific embodiment

With reference to accompanying drawing, the utility model comprises joint 1, is provided with main shoulder 3, connecting thread 2, slave station shoulder 5 on joint 1, and major and

minor shoulder

3,5 lays respectively at the two ends of connecting thread 2, main shoulder 3 is at the big end of connecting thread 2 diameters, and slave station is takeed on 3 small ends at connecting thread 2 diameters; Root at connecting thread 2 has stress relief grooves 4, and joint 1 is divided into male joint and female joint, and male joint and female joint are mated mutually.In main shoulder one side, take on a side at slave station for the root of male joint connecting thread for the root of female joint connecting thread.

The utility model is opened stress relief grooves at the root of connecting thread, avoided because terminal button-type insufficient height, rotate to local distortion increase, the stress concentration phenomenon that causes this moment in connection, reduced the danger that ftractures herein, ruptures, the joint contact pressure is evenly distributed, pressure on the sealing surface no longer concentrates on a certain position, but relatively is evenly distributed on the whole sealing surface, more helps joint sealing; Because screw thread has certain taper, the big end of the engagement first ridge snapping presses power to be reduced greatly, and such pressure distribution state can effectively improve the ability of the anti-extreme loads of joint.Of the present utility model pair of shoulder tool joint structure comprises the structure of male joint and female joint, and main shoulder, connecting thread, slave station shoulder are arranged on the joint, and major and minor shoulder lays respectively at the two ends of connecting thread.Main shoulder is the same with the conventional joint of API with threaded portion, main shoulder is a sealing shoulder, also bearing simultaneously huge torque pressure, reach enough big at moment of torsion, when exceeding the allowable stress of material, the contact end face will be out of shape, and the male joint shoulder very easily pierces in the female joint button, cause female joint to swell, until dropout.In order to overcome this deficiency, increase compressive resistance slave station shoulder at male and female diameter of thread small end.Like this, under strong torsional interaction, major and minor shoulder bears the component-pressure under the torsional interaction simultaneously, make the pressure of main shoulder reduce half, just the supporting capacity of main circular bead surface has increased by one times again, the anti-button that expands of joint, dropout performance also are doubled, and can satisfy requirement high-strength, ultradeep well fully.

Connecting thread adds man-hour, and the length of stress relief grooves and slave station shoulder will be controlled in the suitable margin of tolerance, and the male and female reach needs identical, and button-type and tapering are controlled in the critical field.During use, the every tooth of male and female button-type will mesh fully, and after two shoulder joints screw, after main shoulder withstands, the slave station shoulder need leave suitable gap, can play sealing function to guarantee main shoulder, simultaneously, after being increased to a certain degree, moment of torsion on the slave station shoulder top, plays the effect that the two shoulders of anti-high torque bear pressure.

The utility model mainly is used on drill pipe of oil well and the drill collar.

Claims

1. two shoulder tool joint structures with stress relief grooves, comprise joint, it is characterized in that: on joint, be provided with main shoulder, connecting thread, slave station shoulder, major and minor shoulder lays respectively at the two ends of connecting thread, main shoulder is at the big end of connecting thread diameter, and the slave station shoulder is at the small end of connecting thread diameter; Root at connecting thread has stress relief grooves.

2. two shoulder tool joint structures of band stress relief grooves according to claim 1, it is characterized in that: described joint is male joint or female joint, and male joint and female joint are mated mutually.