CN201056991Y

CN201056991Y - Special screwed joint of petroleum sleeve pipe

Info

Publication number: CN201056991Y
Application number: CNU2007200964746U
Authority: CN
Inventors: 潘贵荣; 曹良伟; 谭淑英; 米寿荣; 王领; 刘良跃; 赵景芳; 孙东征; 卢长林
Original assignee: China National Offshore Oil Corp CNOOC; CNOOC Oil Base Group Co Ltd
Current assignee: China National Offshore Oil Corp CNOOC; CNOOC Energy Technology and Services Ltd
Priority date: 2007-06-20
Filing date: 2007-06-20
Publication date: 2008-05-07
Anticipated expiration: 2017-06-20

Abstract

The utility model discloses a special screwed connector of a petroleum sleeve pipe, and the special screwed connector is composed of a sleeve pipe external thread element and a coupler internal thread element. The taper ratio of the sleeve pipe and the coupler is 1: 11.76, the screw pitch is 6.35 mm, the angle of a thread form carrying surface is 3 degrees, and the angle of a thread form induction lateral surface is 25 degrees; a step is arranged at the connection end of the sleeve pipe and the coupler, a dummy club is arranged in the coupler, and the end surface of the step is tightly contacted with the end surface of the dummy club. The end surface of the step of the sleeve pipe is a concave conical surface, and the taper half angle is 5 degrees; the end surface of the dummy club of the coupler is fitted with the concave taper of the end surface of the step of the sleeve pipe. The height of the screw thread of the sleeve pipe is 1.7 mm, and height of the screw thread of the coupler is 1.75 mm. The utility model has the advantages that the operation is simple, the operating efficiency is high, the connection performance is stable and reliable, the mass production can be achieved, and the requirement of the oil field operation can be satisfied, and therefore, the localization of the special petroleum pipe thread sleeve pipe can be realized.

Description

Petroleum casing pipe special thread joint

Technical field

The utility model relates to a kind of nipple, particularly a kind of special screw thread joint that is applicable to that petroleum casing pipe connects.

Background technology

At present, the sleeve pipe connecting thread joint that is used for oil field operation has two kinds of forms usually, a kind of is API (American Petroleum Institute) standard thread joint, a kind of special thread joint of right and wrong API standard, and the API standard thread that is used for sleeve pipe is comparatively general with the buttress thread joint, it is slow that it exists (1) screw thread to tighten speed, the thread alternating phenomenon easily takes place, machine tightly need be with reference to warning triangle, thereby cause inefficiency (2) to be prone to the screw thread tightening torque and cause the tendency that box cupling outwards expands and sleeve pipe inwardly dwindles when excessive, thread gluing phenomenon, i.e. torque resistant poor-performing easily take place.The existence of above-mentioned shortcoming greatly reduces oil field operation efficient, but not the special thread joint of API standard adopts the special button of import mostly, especially offshore oilfield, because environmental factor is abominable, thereby adopt import special thread joint to overcome above shortcoming in a large number and improve oil field operation efficient simultaneously, satisfying the demand in offshore oil great development stage, but the raising of cost of winning needs the homemade special factor of buckleing with comprehensive each side of our independent research.At above-mentioned present situation, need on the basis of trapezoidal partially and some external special buttons, be improved, produce the petroleum casing pipe nipple that is applicable to various oil field operations.

The utility model content

The utility model has solved in the above-mentioned prior art Petroleum Production buttress thread and has been not easy make-up and has gone up button slower, cause screw thread thread gluing technical problem easily, a kind of easy and simple to handle, high efficiency, the reliable and stable petroleum casing pipe special thread joint of switching performance are provided.

In order to solve the problems of the technologies described above, the technical scheme that the utility model petroleum casing pipe special thread joint is achieved is: be made of sleeve pipe external thread piece and box cupling inner thread piece, the tapering of described sleeve pipe and box cupling is 1: 11.76, the spiral shell square is 6.35mm, described form of thread bearing surface angle is 3 °, and it is 25 ° that the described form of thread imports the side angle; Described sleeve pipe is positioned at the box cupling link and is provided with step, in the described box cupling boss is set, and described step end face closely contacts with described raised head face.

The utility model petroleum casing pipe special thread joint, wherein, described sleeve pipe step end face is the indent conical surface, its tapering half-angle is 5 °; Recessed taper matches in described box cupling raised head face and the sleeve pipe step end face.The screw thread tooth depth of described sleeve pipe is 1.7mm, and the screw thread tooth depth of described box cupling is 1.75mm.

Compared with prior art, the beneficial effects of the utility model are: thread pitch has strengthened, and can tighten fast, thereby increase work efficiency; Tapering has strengthened, and can overcome cross threading and thread gluing bad phenomenon effectively; Form of thread side angle is reasonable in design, has reduced screw thread link closely resistance and moment of torsion, has overcome the tendency that box cupling outwards expands and sleeve pipe inwardly dwindles; The face of holding out against of sleeve pipe and box cupling is that the conical surface closely contacts, and last button is convenient, need not check warning triangle.Owing to adopt above-mentioned technical characterictic, the utility model connects stable, tightens also and can keep stable performance even cross moment of torsion.

Description of drawings

Fig. 1 is the structure chart of the utility model petroleum casing pipe special thread joint;

Fig. 2 is the partial enlarged drawing at the place of A shown in Fig. 1;

Fig. 3 is the external screw thread thread form schematic diagram at the place of C shown in Fig. 1.

Be the explanation of Reference numeral in the Figure of description below:

---sleeve pipe B's P---box cupling 1---is threaded

2---step 3---step end face 4---raised head faces

---length of bench α---step end face angle beta---thread form imports the side angle to L

γ---thread form carrying side angle S---pitch

The specific embodiment

Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.

As Fig. 1, Fig. 2 and shown in Figure 3, the utility model petroleum casing pipe special thread joint is made of sleeve pipe P external thread piece and box cupling B inner thread piece, the tapering of described sleeve pipe P and box cupling B be 1: 11.76 bigger than 1: 16 the tapering of buttress thread of prior art, be not easy to take place cross threading and thread gluing phenomenon; As shown in Figure 3, pitch S=6.35mm, spiral shell moment ratio prior art buttress thread pitch is big, can tighten fast, thereby increase work efficiency; Form of thread bearing surface angle γ=3 °, form of thread importing side angle beta=25 °; The screw thread tooth depth of described sleeve pipe P is 1.7mm, and the screw thread tooth depth of described box cupling B is 1.75mm; Described sleeve pipe P is positioned at box cupling B link and is provided with a moment of torsion step 2, and its length L=12 have reduced screw thread and tightened power, has reduced the tendency that box cupling B outwards expands and sleeve pipe P inwardly dwindles; In the described box cupling B boss is set, described step end face 3 is the indent conical surface, the tapering half-angle α of its step end face=5 °, described step end face 3 closely contacts with described raised head face 4, when promptly going up button, push up on the raised head face 4 of box cupling B inner thread piece, therefore by sleeve pipe P external thread piece moment of torsion step end face 3, need not check warning triangle during last button, operation is very easy.The utlity model has stable switching performance, can keep stable performance even the mistake moment of torsion tightens also;

The utility model can reach batch process, satisfies the demand of oil field operation, thereby realizes the production domesticization of special oil pipe thread sleeve pipe.

Although in conjunction with the accompanying drawings preferred embodiment of the present utility model is described above; but the utility model is not limited to the above-mentioned specific embodiment; the above-mentioned specific embodiment only is schematic; rather than it is restrictive; those of ordinary skill in the art is under enlightenment of the present utility model; not breaking away under the scope situation that the utility model aim and claim protect, can also make a lot of forms, these all belong within the protection of the present utility model.

Claims

1. petroleum casing pipe special thread joint, be made of sleeve pipe external thread piece and box cupling inner thread piece, it is characterized in that: the tapering of described sleeve pipe and box cupling is 1: 11.76, and pitch is 6.35mm, described form of thread bearing surface angle is 3 °, and it is 25 ° that the described form of thread imports the side angle; Described sleeve pipe is positioned at the box cupling link and is provided with step, in the described box cupling boss is set, and described step end face closely contacts with described raised head face.

2. according to the described petroleum casing pipe special thread of claim 1 joint, it is characterized in that: described sleeve pipe step end face is the indent conical surface, and its tapering half-angle is 5 °; Recessed taper matches in described box cupling raised head face and the sleeve pipe step end face.

3. according to claim 1 or 2 described petroleum casing pipe special thread joints, it is characterized in that: the screw thread tooth depth of described sleeve pipe is 1.7mm, and the screw thread tooth depth of described box cupling is 1.75mm.