CN201412077Y

CN201412077Y - Negative-buckle threaded sleeve similar to trapezoid

Info

Publication number: CN201412077Y
Application number: CN2009200816584U
Authority: CN
Inventors: 吴宗明
Original assignee: CHENGDU MINJIANG PRECISION TOOL Co Ltd
Current assignee: CHENGDU MINJIANG PRECISION TOOL Co Ltd
Priority date: 2009-06-10
Filing date: 2009-06-10
Publication date: 2010-02-24
Anticipated expiration: 2019-06-10

Abstract

The utility model discloses a negative-buckle threaded sleeve similar to a trapezoid, which comprises a sleeve main body. An internal thread joint is arranged at one end of the sleeve main body, and an external thread joint is arranged at the other end of the sleeve main body. The internal thread joint is screwed together with the external thread joint of the other sleeve by a thread so as to forma continuous sleeve set. An inclination angle between the surfaces of a thread carrying surface and a torque table shoulder on the internal thread joint and the external thread joint is negative 9 DEG plus/minus 10 minutes. The internal thread joint and the external thread joint form a negative-buckle structure similar to the trapezoid after being mutually screwed. To sum up, the negative-bucklethreaded sleeve adopts reasonable as well as simple structure, and is convenient for processing; the negative-buckle threaded structure similar to the trapezoid can bear high axial compressing and bending load, has strong capability of resisting bending, and effectively improves the air tightness and connecting intensity of the sleeve.

Description

A kind of trapezoidal partially negative button threaded sleeve

Technical field

The utility model relates to the oil-well drilling equipment field, is specifically related to a kind of trapezoidal partially negative button threaded sleeve.

Background technology

Tubing and casing---being called for short sleeve pipe is to require the degree of depth machinery converted products high, that consumption is big in the petroleum engineering.Using screw thread that single tubing and casing is connected into reaches thousands of meters and can bear hundreds of atmospheric long strings to constitute the tubulose high-pressure bottle.APISPEC 5B standard code casing threads commonly used is round thread (writing a Chinese character in simplified form CSG) and buttress thread (writing a Chinese character in simplified form BCSG).China's oil gas field generally adopts this two kinds of nipples usually.Exploration and development along with China's oil gas, especially the functional performance that increases all oil sleeve joint of wells such as deep-well, ultradeep well, high-pressure gas well, directional well, sulfide hydrogen proposes higher requirement, the incompatibility requirement of the tightness of API round thread and buttress thread, bonding strength, corrosion resistance, various countries launch the development and application of special thread joint one after another for this reason, with requirements such as the tightness that improves sleeve pipe, bonding strengths.

The utility model content

Technical problem to be solved in the utility model is to overcome above-mentioned defective, provides a kind of tightness and bonding strength all high trapezoidal partially negative button threaded sleeve.

The technical problem that the utility model proposed is to solve like this: a kind of trapezoidal partially negative button threaded sleeve, comprise sleeve body, one end of sleeve body is provided with female adapter, the other end is provided with male connection, female adapter is screwed in to constitute continuous sleeve pipe group by screw thread with the male connection of another root sleeve pipe, angle of inclination between screw thread bearing surface in described female adapter and male connection surface and the torque shoulder surface is-9 ° ± 10 ', female adapter after spinning mutually and male connection have constituted trapezoidal partially negative buckle structure.

In sum, the utility model is rational in infrastructure simple, easy to process, and this trapezoidal partially negative button helicitic texture can bear very high axial compression and bending load, and bending resistance is strong, has effectively improved the tightness and the bonding strength of sleeve pipe.

Description of drawings

Fig. 1 is the structural representation after the trapezoidal partially negative button threaded sleeve of the utility model connects.

Fig. 2 is a structural representation under existing BCSG external screw thread and the female thread portion released state.

Fig. 3 is a structural representation under existing BCSG external screw thread and the female thread portion bonding state;

Fig. 4 is a form of thread structural representation under the A part sleeve pipe released state among Fig. 1;

Fig. 5 is a form of thread structural representation under the A part thimble joint state among Fig. 1;

Wherein: 1-sleeve body, 2-female adapter, 3-male connection, 4-torque shoulder, 5-screw thread bearing surface.

The specific embodiment

Below in conjunction with accompanying drawing the specific embodiment of the present utility model is described in detail.

Shown in Fig. 1,4,5, a kind of trapezoidal partially negative button threaded sleeve, comprise sleeve body 1, one end of sleeve body 1 is provided with female adapter 2, the other end is provided with male connection 3, female adapter 2 is screwed in to constitute continuous sleeve pipe group by screw thread with the male connection 3 of another root sleeve pipe, screw thread bearing surface 5 surface in described female adapter 2 and the male connection 3 and the angle of inclination between torque shoulder 4 surfaces be-9 ° ± 10 ', female adapter 2 after spinning mutually and male connection 3 have constituted trapezoidal partially negative buckle structure.

Shown in Fig. 2,3, being reference perpendicular to the casing axis direction, traditional sleeve approaching face angle is 10 °, angle position between screw thread bearing surface 5 and the torque shoulder 4 close be+3 °, the helicitic texture of this sleeve pipe is traditional inclined to one side trapezium structure, its thread seal is lower, be subjected to the time spent of doing of interior pressure, stretching and crooked combined load when the BCSG structure, torque shoulder and the screw thread bearing surface bending normal stresses that will superpose, the contact pressure of its torque shoulder reduces, thereby its sealing load reduces.

Shown in Fig. 4,5, being reference perpendicular to the casing axis direction, the approaching face angle is constant, still be 10 °, and the pass, angle position of improving between rear sleeve screw thread bearing surface 5 and the torque shoulder 4 is-9 °, the helicitic texture of this sleeve pipe is trapezoidal partially negative buckle structure, its thread seal is higher, be subjected to the time spent of doing of interior pressure, stretching and crooked combined load when the BCSG structure, torque shoulder and the screw thread bearing surface bending normal stresses that will superpose, the contact pressure of its torque shoulder increases on the contrary, thereby its sealing load improves.The difference structure of the utility model and traditional sleeve is: the screw thread bearing surface and the torque shoulder face between angle position relation change has taken place, angular relationship ° is changed into-9 ° by original+3, change by 12 ° of angles makes the stressing conditions of screw thread bearing surface also change thereupon, has improved the tightness and the bonding strength of sleeve pipe effective and reasonablely.

-9 ° the numerical value that minimum angles is not limited among the embodiment to be exemplified between screw thread bearing surface of the present utility model and the torque shoulder, this numerical value is the angle numerical value when the most desirable by each character parameter of test of many times rear sleeve, but should be as qualification of the present utility model.

Claims

1, a kind of trapezoidal partially negative button threaded sleeve, comprise sleeve body (1), one end of sleeve body (1) is provided with female adapter (2), the other end is provided with male connection (3), female adapter (2) is screwed in to constitute continuous sleeve pipe group by screw thread with the male connection (3) of another root sleeve pipe, it is characterized in that: the angle of inclination between screw thread bearing surface (5) in described female adapter (2) and the male connection (3) surface and torque shoulder (4) surface is-9 ° ± 10 ', female adapter (2) and male connection (3) after spinning have mutually constituted trapezoidal partially negative buckle structure.