CN2764923Y

CN2764923Y - Double shoulder hermetic sealing drill pipe joint

Info

Publication number: CN2764923Y
Application number: CN 200520039379
Authority: CN
Inventors: 赵鹏
Original assignee: Baoshan Iron and Steel Co Ltd
Current assignee: Baoshan Iron and Steel Co Ltd
Priority date: 2005-01-31
Filing date: 2005-01-31
Publication date: 2006-03-15
Anticipated expiration: 2015-01-31

Abstract

The utility model relates to a drill pipe for petroleum drilling, particularly a double shoulder hermetic sealing drill pipe joint. The utility model mainly solves the problem of the hermetic seal of a joint of the drill pipe. The double shoulder hermetic sealing drill pipe joint is provided with an outer thread joint and an inner thread joint which is connected with the outer thread joint in a thread mode, wherein the outer thread joint is provided with an outer thread which axially extends between a radially outward outer shoulder and a radially inward inner end surface, and the outer thread joint comprises a ring type groove which axially extends between the outer shoulder and the outer thread and a front end part which axially extends between an inner end surface and the outer thread. The inner thread joint is provided with an inner thread which axially extends between a radially outward outer end surface and a radially inward inner shoulder, the inner thread joint comprises a borehole part which axially extends between an outer surface and the inner thread and a back end part which axially extends between the inner shoulder and the inner thread, and a polytetrafluoroethylene sealing ring is arranged between the ring type groove and the borehole part. The utility model is suitable for the testing construction of the drill pipe of high difficulty air wells, such as deep wells, ultradeep wells, directional wells, horizontal wells, big declined wells, etc.

Description

Two shoulder hermetic seal tool joints

Technical field: the utility model relates to a kind of oil drilling drilling rod, particularly a kind of pair of shoulder hermetic seal tool joint.

Background technology: the drilling rod that is used for oil drilling is made by the API standard production.Its structure is tool joint pin of each butt welding and a tool joint box at the drill pipe body two ends.

Fig. 1 is the schematic diagram of API standard tool joint.This tool joint is made up of male connection 21 and the female adapter 22 that is threaded with it.Male connection 21 has between a radially outer outer shoulder 23 and the radially inner inner face 25 axially extended external screw thread 27 and axially extended base portion 29 between shoulder 23 and the external screw thread 27 outside.Female adapter 22 have a radially outer outer face 24 and one radially inner between the inclined-plane 26 axially extended internal thread 28 and between internal thread 28 and outer face 24 axially extended bore hole part 30.The outer shoulder 23 of male connection 21 is L1 to the length of inner face 25, and the outer face 24 of female adapter 22 is L2 to the length on interior inclined-plane 26.

The moment of torsion that above-mentioned joint bears is between outer shoulder 23 and the outer face 24 and the moment of friction between external screw thread 27 and the internal thread 28.

According to the design of API standard, the torsion strength of above-mentioned joint is generally 80% of body, can occur failure accidents such as bloated button of female adapter and the fracture of male connection screw thread when therefore above-mentioned joint in use runs into excessive torque.

In order to solve the low problem of joint torsion strength, generally take to change the interior inclined-plane 26 of female adapter 22 into footpath inwardly shoulder, the outer face 25 of male connection 21 is contacted with it, form extra moment of friction, improve the torsional strength of joint with this.

According to this thinking, United States Patent (USP) 4548431,5449336,5492375,5908212,6330004 and Chinese patent 92114303.6,98806866.4 have proposed scheme separately respectively.Though adopt the joint of these scheme manufacturings that higher torsional strength can be provided, good hermetic seal ability can not be provided.

United States Patent (USP) 4595219 provides another solution route.As shown in Figure 2, adopt the joint of this scheme manufacturing to have good hermetic seal ability, but the torsional strength of this joint is equal to the API modular connection.

Along with the development of drilling technology, the oil field user presses for a kind of higher torsional strength that both had, and the tool joint that has good hermetic seal ability again is to satisfy the needs of drill stem testing in the drillng operation.

Summary of the invention: the purpose of this utility model is the female adapter that obtains a male connection and be threaded with it, its torsional strength is higher than the API standard tool joint, have good hermetic seal ability simultaneously, and can exchange with the API standard tool joint and use.For achieving the above object, the solution that the utility model proposes is: a kind of pair of shoulder hermetic seal tool joint has

(1) male connection, described male connection has axially extended external screw thread between a radially outer outer shoulder and the radially inner inner face, and described male connection comprises an axially extended ring shaped slot and an axially extended fore-end between described inner face and external screw thread between shoulder and the external screw thread outside described;

Outside described the length of shoulder to inner face greater than shoulder outside the male connection of API standard drilling rod to the length of inner face, but less than the outer face of API standard drill pipe box length to interior inclined-plane;

One is used for the female adapter that is threaded with described male connection, described female adapter has in a radially outer outer face and one are radially inner axially extended internal thread between the shoulder, and described female adapter comprises one at axially extended bore hole part between described external surface and the internal thread and one axially extended rear end part between shoulder and the internal thread in described;

From the length of described outer face to interior shoulder greater than shoulder outside the male connection of API standard drilling rod to the length of inner face, but less than the outer face of API standard drill pipe box length to interior inclined-plane;

Between described ring shaped slot and described bore hole part, teflin ring is arranged.

(2) described external screw thread is 1: 6 from the tapering that first external screw thread adjacent with described fore-end extends radially outwardly into last external screw thread adjacent with described ring shaped slot.

(3) described internal thread is 1: 6 from the tapering that first internal thread adjacent with described bore hole part extends radially inwardly to last internal thread adjacent with described rear end part.

(4) when described male connection and described female adapter were manually tightened, the interior shoulder of the inner face of described male connection and described female adapter had the gap of 0～0.5mm.

The beneficial effects of the utility model are: compared with prior art, the utility model improves the structure of API standard tool joint, joint torsional strength after the improvement is higher than the API standard tool joint, have good hermetic seal ability simultaneously, and can exchange with the API standard tool joint and use.

Description of drawings:

Fig. 1 is an API standard tool joint structural representation

Fig. 2 is United States Patent (USP) 4595219 tool joint structural representations

Fig. 3 is the utility model structural representation

Among Fig. 3: 1-male connection, 2-female adapter, the outer shoulder of 3-, 4-outer face, shoulder in the 5-inner face, 6-, 7-external screw thread, 8-internal thread, 9-ring shaped slot, 10-bore hole part, 11-fore-end, 12-rear end part, 13-teflin ring.

Among Fig. 1: 21-male connection, 22-female adapter, the outer shoulder of 23-, 24-outer face, inclined-plane in the 25-inner face, 26-, 27-external screw thread, 28-internal thread, 29-base portion, 30-bore hole part

The specific embodiment:

Below the utility model is described in further detail:

Fig. 3 is a schematic diagram of the present utility model.Male connection 1 has axially extended external screw thread 7 between a radially outer outer shoulder 3 and the radially inner inner face 5; Axially extended ring shaped slot 9 is arranged between shoulder 3 and the external screw thread 7 outside, axially extended fore-end 11 is arranged between inner face 5 and external screw thread 7.

External screw thread 7 is 1: 6 from the tapering that first external screw thread adjacent with fore-end 11 extends radially outwardly into last external screw thread adjacent with ring shaped slot 9.

Outer shoulder 3 arrives the length L 1 of inner face 25 to the length L 3 between the inner face 5 greater than the outer shoulder 23 of API standard drilling rod male connection 21, but arrives the length L 2 on interior inclined-plane 26 less than the outer face 24 of API standard drill pipe box 22.

Female adapter 2 have a radially outer outer face 4 and one radially inner in axially extended internal thread 8 between the shoulder 6; Axially extended bore hole part 10 between external surface 4 and internal thread 8, axially extended rear end part 12 between interior shoulder 6 and internal thread 8.

Internal thread 8 is 1: 6 from the tapering that first internal thread adjacent with bore hole part 10 extends radially inwardly to last internal thread adjacent with rear end part 12.

Outer face 4 is arrived the length L 1 of inner face 25 to the length L 4 between the interior shoulder 6 greater than API standard drilling rod male connection 21 outer shoulders 23, but arrives the length L 2 on interior inclined-plane 26 less than the outer face 24 of API standard drill pipe box 22.

Between ring shaped slot 9 and bore hole part 10, teflin ring 13 is arranged.

When male connection 1 and female adapter 2 were manually tightened, the inner face 5 of male connection 1 and the interior shoulder 6 of female adapter 2 had the gap of 0～0.5mm, i.e. 0≤L4-L3≤0.5mm.

Because outer shoulder 3 arrives the length L 1 of inner face 25 greater than the outer shoulder 23 of API standard drilling rod male connection 21 to the length L 3 between the inner face 5, but the length L 2 on interior inclined-plane 26 is arrived in the outer face 24 less than API standard drill pipe box 22, so has guaranteed the interchangeability of male connection 1 with API standard drill pipe box 22.

Because the length L 1 of inner face 25 is arrived in outer face 4 greater than API standard drilling rod male connection 21 outer shoulders 23 to the length L 4 between the interior shoulder 6, but the length L 2 on interior inclined-plane 26 is arrived in the outer face 24 less than API standard drill pipe box 22, so has guaranteed the interchangeability of female adapter 2 with API standard drilling rod male connection 21.

When button or down-hole moment of torsion are excessive on the super moment of torsion, the inner face 5 of male connection 1 reduces until disappearance with the gap of the interior shoulder 6 of female adapter 2, make blank area form a rigid body, improved the torsional strength and the bending resistance of joint, made the torsional strength of joint be higher than the API standard tool joint.

Owing between ring shaped slot 9 and bore hole part 10, have teflin ring 13, so tool joint has good hermetic seal ability.

Select the 51/2FH tool joint for use, its external diameter is 184.15mm, and internal diameter is 88.9mm, and the joint yield strength is 827MPa, and when manually tightening, the interior shoulder of the inner face of male connection and female adapter has the gap of 0.15mm.Through calculating, API standard tool joint torsional strength is 98.3kNm, and the utility model joint torsional strength is 140.1kNm, has improved 42.5%.Owing between male connection and female adapter, have teflin ring, so tool joint has good hermetic seal ability.

Estimate feasibility and prospect that invention is applied: because torsional strength of the present utility model is higher than the API standard tool joint, has good hermetic seal ability simultaneously, and can exchange with the API standard tool joint and use, therefore be specially adapted to the drill stem testing construction of highly difficult wells such as deep-well, ultradeep well, directional well, horizontal well, high angle hole.

Claims

1, a kind of pair of shoulder hermetic seal tool joint, have a male connection and a female adapter that is threaded with it, it is characterized in that: described male connection has axially extended external screw thread between a radially outer outer shoulder and the radially inner inner face, described male connection comprises an axially extended ring shaped slot and an axially extended fore-end between described inner face and external screw thread between shoulder and the external screw thread outside described, outside described the length of shoulder to inner face greater than shoulder outside the male connection of API standard drilling rod to the length of inner face, but less than the outer face of API standard drill pipe box length to interior inclined-plane; Described female adapter has in a radially outer outer face and one are radially inner axially extended internal thread between the shoulder, described female adapter comprises one at axially extended bore hole part between described external surface and the internal thread and one axially extended rear end part between shoulder and the internal thread in described, from the length of described outer face to interior shoulder greater than shoulder outside the male connection of API standard drilling rod to the length of inner face, but less than the outer face of API standard drill pipe box length to interior inclined-plane; Between described ring shaped slot and described bore hole part, teflin ring is arranged.

2, according to claim 1 pair of shoulder hermetic seal tool joint is characterized in that: described external screw thread is 1: 6 from the tapering that first external screw thread adjacent with described fore-end extends radially outwardly into last external screw thread adjacent with described ring shaped slot.

3, according to claim 1 pair of shoulder hermetic seal tool joint is characterized in that: described internal thread is 1: 6 from the tapering that first internal thread adjacent with described bore hole part extends radially inwardly to last internal thread adjacent with described rear end part.

4, according to claim 1 pair of shoulder hermetic seal tool joint, it is characterized in that: when described male connection and described female adapter were manually tightened, the interior shoulder of the inner face of described male connection and described female adapter had the gap of 0～0.5mm.