CN202360042U

CN202360042U - Double shoulder highly anti-twisting drill pipe joint

Info

Publication number: CN202360042U
Application number: CN201120304542XU
Authority: CN
Inventors: 赵钧羡
Original assignee: JIANGSU HEXIN PETROLEUM MACHINERY CO Ltd
Current assignee: JIANGSU HEXIN PETROLEUM MACHINERY CO Ltd
Priority date: 2011-08-18
Filing date: 2011-08-18
Publication date: 2012-08-01
Anticipated expiration: 2021-08-18

Abstract

The utility model discloses a double shoulder highly anti-twisting drill pipe joint, including a male joint and a female joint, wherein the male joint connected with the female joint by a screw thread cooperation, the root step surface of the outside thread of the male joint is tightly combined with the end portion step surface of the internal screw thread of the female joint, the thread end surface of the male joint is tightly combined with the root surface of the internal screw thread of the female joint, and the root step surface and the end surface of the outside thread of the male joint are corresponding to the end portion step surface and the root surface of the internal screw thread of the female joint to form an annular closed chamber. Two ends of the threaded connection of the male joint and the female joint are both provided with tight combination, load is dispersed, the stress phenomenon at the root of the outside thread is mitigated, the closed chamber forms a buffer area, which is good for protecting the screw thread and raising screw thread joint strength, the eddy current problem caused in that an annular groove exists in the inner wall connection of a single sealing surface joint is avoided, and steam rushing phenomenon at the connection of the screw thread is avoided because of the enhanced sealing. The joint anti-twisting intensity is effectively raised, and the usage life is prolonged.

Description

A kind of pair of high antitorque tool joint of shoulder

[technical field]

The utility model relates to a kind of field drilling and uses oil drilling tools, relates in particular to a kind of high antitorque high strength petroleum tool joint.

[background technology]

Tool joint is an important component of realizing that oil drill rocker connects, and its condition of work is very abominable, and stressing conditions is very complicated.In normal rotary drilling process, multiple static load and dynamic loadings such as joint will receive pretension, tension and compression, reverses, bending, external and internal pressure, and to receive the corrosiveness of drilling mud and stratum media.Existing tool joint is to produce according to the structural shape of AP I standard 7 and SY/T5290 joint of petroleum drill rod; By male joint and female joint with being threaded; Outer thread root step surface and the sealing of internal thread end face jam-packed form single sealing surface, and thread root and sealing surface lean on very closely.Incomplete investigation through tower being referred to drilling tool failure shows that all kinds of drilling tool failures mainly are the external screw thread fractures, secondly is to thread off.One of major reason that causes joint fails is the load concentration of connecting thread, particularly near the thread root of sealing shoulder, causes serious stress concentration, the fatigue fracture of spiral shell buckle, and excessive deformation causes scrapping too early.Consult Fig. 2, have only single sealing surface 9 between the male joint 8 of existing tool joint, the female joint 10, there is annular recess 7 the inwall junction, and the screw thread two ends do not have closed cavity.

[utility model content]

The technical problem that the utility model solves is the weak point that overcomes existing tool joint, provides a kind of and can alleviate screw thread stress concentration phenomenon, improves the joint torsional strength, the high antitorque high strength petroleum tool joint that prolongs its application life.

In order to solve the problems of the technologies described above, the technical scheme that the utility model adopts is: a kind of pair of high antitorque tool joint of shoulder, comprise male joint and female joint, and said male joint is connected with said female joint threaded engagement,

The external screw thread root step surface of said male joint and the internal threaded end step surface of female joint are combined closely; Combine closely in the root surface of the screw thread end face of said male joint and the internal thread of female joint; The internal threaded end step surface of the external screw thread root step surface of said male joint and end face and female joint and corresponding formation annular closed chamber, root surface, said annular closed chamber radial clearance equals the tooth height of screw thread.

The utility model beneficial effect compared with prior art is: combine closely owing to all form at the two ends of the screw connection point of male and female joint; Load is disperseed, alleviate the stress phenomena of external screw thread root, respectively there is a closed cavity at the screw thread two ends simultaneously; Form buffer area; Help protecting screw thread, improve the bonding strength of screw thread, the joint of double-sealing face pattern is because the inwall junction is directly level and smooth continuous; The eddy current problem of avoiding single sealing surface joint to produce because of the annular recess that has the inwall junction, and the enhancing of sealing is avoided the threaded connection place vapour to occur scurrying phenomenon.These all can effectively improve the joint torsional strength, prolong its application life.

Preferably, the internal thread root step surface of the external screw thread root step surface of said male joint and end face, female joint and root surface is a smooth flat.

Preferably, to equal the tooth of screw thread high for said annular closed chamber radial clearance.

Preferably, the long 45～49mm of external screw thread root closed cavity, the long 21～24mm of internal thread root closed cavity.

[description of drawings]

Accompanying drawing described herein is the further understanding that is used to provide the utility model, constitutes the application's a part, but do not constitute improper qualification the utility model, in the accompanying drawings:

Fig. 1 is the structural representation of the utility model;

Fig. 2 is existing single sealing surface tool joint structural representation.

Description of reference numerals: 1-male joint; 2-external seal face; 3-external screw thread root closed cavity; The 4-female joint; 5-internal thread root closed cavity; The 6-inner sealing surface; The 7-annular recess; The 8-male joint; The single sealing surface of 9-; The 10-female joint.

[specific embodiment]

To combine accompanying drawing and specific embodiment to specify the utility model below, be used for explaining the utility model in the illustrative examples and the explanation of the utility model, but not as the qualification to the utility model.

With reference to shown in Figure 1; The utility model discloses the high antitorque tool joint of a kind of pair of shoulder; Comprise male joint 1 and female joint 4; Said male joint 1 is connected with said female joint 4 threaded engagement; The external screw thread root step surface of said male joint 1 and the internal threaded end step surface of female joint 4 are combined closely, and combine closely in the root surface of the screw thread end face of said male joint 1 and the internal thread of female joint 4, the internal threaded end step surface of the external screw thread root step surface of said male joint 1 and end face and female joint 4 and corresponding formation annular closed chamber, root surface; Be external seal face 2 and inner sealing surface 6, the internal thread root step surface of the external screw thread root step surface of said male joint 1 and end face, female joint 4 and root surface are smooth flat.The tooth that said annular closed chamber radial clearance equals screw thread is high.External screw thread root closed cavity 3 long 45～49mm, internal thread root closed cavity 5 long 21～24mm.

The utility model male joint 1 links together with female joint 4 usefulness taper pipe threads; Male joint external screw thread root step surface and screw thread end face are combined closely with the screw thread end face and the root step surface of female joint internal thread respectively, form double-sealing face, i.e. external seal face 2 and inner sealing surface 6; There are external screw thread root closed cavity 3 and internal thread root closed cavity 5 in the two ends of threaded connection place; The tooth that its radial clearance equals screw thread is high, external screw thread root closed cavity 3 long 46mm, internal thread root closed cavity 5 long 23mm.Male and female inner nosepiece wall junction is directly level and smooth to link to each other.

High antitorque high strength petroleum tool joint forms with the female joint that has internal thread 4 cooperations by having externally threaded male joint 1; Improvements are that male joint 1 externally threaded root step surface and screw thread end face are combined closely with the screw thread end face and the root step surface of female joint internal thread respectively; Form double-sealing face, an annular closed chamber is respectively arranged between thread root and end face and the above-mentioned junction.

Owing to all form at the two ends of the screw connection point of male and female joint 4 and to combine closely; Load is disperseed, alleviate the stress phenomena of external screw thread root, respectively there is a closed cavity at the screw thread two ends simultaneously; Form buffer area; Help protecting screw thread, improve the bonding strength of screw thread, the joint of double-sealing face pattern is because the inwall junction is directly level and smooth continuous; The eddy current problem of avoiding single sealing surface joint to produce because of the annular recess that has the inwall junction, and the enhancing of sealing is avoided the threaded connection place vapour to occur scurrying phenomenon.These all can effectively improve the joint torsional strength, prolong its application life.

The above in the spiritual category that does not break away from the utility model creation, is familiar with the protection domain that this technological various simple covert and modification that those skilled in the art did still belongs to the utility model only with the convenient the utility model of explaining.

Claims

1. high antitorque tool joint of two shoulders; Comprise male joint and female joint; Said male joint is connected with said female joint threaded engagement; The external screw thread root step surface of said male joint and the internal threaded end step surface of female joint are combined closely; Combine closely in the root surface of the screw thread end face of said male joint and the internal thread of female joint, the internal threaded end step surface of the external screw thread root step surface of said male joint and end face and female joint and corresponding formation annular closed chamber, root surface is characterized in that: said annular closed chamber radial clearance equals the tooth height of screw thread.