CN210033311U

CN210033311U - Oil casing anti-reflux device and oil casing

Info

Publication number: CN210033311U
Application number: CN201920136466.2U
Authority: CN
Inventors: 李太仁; 周振强; 韩昭来; 沈彦德; 张春生
Original assignee: Panjin Yaxing Kechuang Industrial Co Ltd
Current assignee: PANJIN LIAOHE OIL FIELD JINHUAN INDUSTRY Co.,Ltd.
Priority date: 2019-01-27
Filing date: 2019-01-27
Publication date: 2020-02-07
Anticipated expiration: 2029-01-27

Abstract

The utility model discloses an oil casing prevents device against current, include: the valve block, the side circumference of valve block is provided with valve thread, through valve thread is fixed with oil sheathed tube body hole screw thread threaded connection, runner and valve pocket have set gradually from a left side right side in the valve block, runner and valve pocket intercommunication, be provided with spring and valve head in the valve pocket, the right-hand member of spring and the being connected of valve pocket, the left end is connected with the valve head right-hand member, the left end of valve pocket is the conical surface, the valve head be with the conical surface tapered block that cooperatees and use, the valve pocket right-hand member communicates with oil sheathed tube body. Correspondingly, still provide an oil casing, include: the anti-reflux device for the oil casing comprises a casing body, wherein the oil casing is connected with the anti-reflux device in a threaded manner. Utilize the oil casing anti-reflux device of this application, can prevent that shaft bottom oil gas from upwelling along the tubular column hole is contrary under the pressure effect, be favorable to improving construction fail safe nature.

Description

Oil casing anti-reflux device and oil casing

Technical Field

The utility model relates to an oil gas bores tubular product threaded connection technical field, in particular to oil casing prevents device and oil casing against current.

Background

In the development process of the petroleum industry, along with the development of oil well gas drilling operation towards the direction of larger well depth, higher pressure and temperature and more severe working condition conditions and the progress of the oil drilling and production technology, the API standard threaded joint commonly used for the special oil pipe is difficult to meet the development requirements of oil fields. Although the API round thread has a relatively excellent sealing performance, the connection strength of the thread part is only 60% to 80% of that of the body part, and the API partial rectangular thread has a relatively high connection strength but an unsatisfactory sealing performance. Therefore, various manufacturers of large petroleum-dedicated pipes in the world are dedicated to developing special threaded oil well pipes with superior joint strength and sealing performance.

The pressure in the well under the deep well or the abnormal well condition is suddenly increased, oil and gas at the well bottom can reversely flow upwards along the inner hole of the pipe column under the action of the pressure, the light overflow causes the heavy overflow to cause blowout, and the problems to be solved by the oil sleeve are all solved urgently.

Disclosure of Invention

The utility model aims at providing an oil casing prevents device and oil casing against current.

In order to realize the utility model discloses a purpose, the utility model provides an oil casing prevents device against current, include: the valve block, the side circumference of valve block is provided with valve screw thread 14, through valve screw thread 14 is fixed with 1 hole screw thread 10 threaded connection of oil sheathed tube body, runner 11 and valve pocket 15 have set gradually from the left hand right side in the valve block, runner 11 and valve pocket 15 intercommunication, be provided with spring 13 and valve head 12 in the valve pocket 15, the right-hand member of spring 13 and being connected of valve pocket 15, the left end is connected with valve head 12 right-hand member, the left end of valve pocket 15 is the conical surface, valve head 12 for with the conical surface matches the toper piece that uses, 15 right-hand members of valve pocket and 1 intercommunication of oil sheathed tube body.

Correspondingly, still provide an oil casing, include: the anti-reflux oil casing pipe comprises a pipe body 1, wherein the oil casing pipe is connected with the anti-reflux device through internal threads.

The pipe comprises a pipe body 1 and is characterized by further comprising a coupling 2, wherein the pipe body 1 is connected through the coupling 2, a sawtooth supporting surface 4 is arranged in the middle of the outer circumference of the coupling 2, the sawtooth supporting surface 4 is in a sawtooth shape, an included angle a of the sawtooth supporting surface is 60 degrees, and the tooth height h is 2.5 mm.

The structure at the two ends of the coupling 2 is different, an internal thread 5 and an internal thread sealing conical surface 6 are arranged at one end of the inner circumference of the coupling, an internal inclined surface 3 is arranged at the inner circumference of the other end of the inner circumference of the coupling, the structure at the two ends of the pipe body 1 is different, an external thread 8 is arranged on the outer circumference of one end of the pipe body 1, an external inclined surface 9 is arranged at the other end of the external thread sealing conical surface 7, the external thread sealing conical surface 7 and the internal thread sealing conical surface 6 are respectively arranged at the front end of the external thread.

Wherein, the tooth form of the internal thread 5 and the external thread 8 is rectangular.

The tooth profiles of the internal thread 5 and the external thread 8 are identical in rectangular structure, the tooth height is 2.25mm, and the thread pitch P is 6.35 mm.

Compared with the prior art, the beneficial effects of the utility model are that, utilize the oil jacket pipe anti-reflux device of this application, can prevent that shaft bottom oil gas from upwelling along the tubular column hole is contrary under the pressure effect, be favorable to improving construction fail safe nature.

Drawings

Fig. 1 is a schematic structural view of the oil casing anti-backflow device of the present invention;

fig. 2 is a schematic structural view of the oil casing of the present invention;

FIG. 3 is a schematic view of the coupling structure of the present invention;

FIG. 4 is a schematic view of the structure of the coupling sawtooth support surface of the present invention;

fig. 5 is a schematic view of the tube structure of the present invention;

in the figure: 1-tube body, 2-coupling, 3-inner inclined plane, 4-sawtooth supporting plane, 5-inner thread, 6-inner thread sealing conical surface, 7-outer thread sealing conical surface, 8-outer thread, 9-tube body outer inclined plane, 10-inner hole thread, 11-flow passage, 12-valve head, 13-spring, 14-valve thread, 15-valve cavity, h-tooth height, a-tooth included angle and D-tube body outer diameter.

Detailed Description

The present invention will be described in further detail with reference to the following drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It should be noted that "connected" and words used in this application to express "connected," such as "connected," "connected," and the like, include both direct connection of one element to another element and connection of one element to another element through another element.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when used in this specification the singular forms "a", "an" and/or "the" include "specify the presence of stated features, steps, operations, elements, or modules, components, and/or combinations thereof, unless the context clearly indicates otherwise.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Spatially relative terms, such as "above … …", "above … …", "above … …", "above", and the like, may be used herein for ease of description to describe the spatial relationship of one component or module or feature to another component or module or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the component or module in use or operation in addition to the orientation depicted in the figures. For example, if a component or module in the figures is turned over, components or modules described as "above" or "above" other components or modules or configurations would then be oriented "below" or "beneath" the other components or modules or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The components or modules may also be oriented in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

As shown in fig. 1-5, the utility model provides an oil casing anti-reflux device, including: the valve block, the side circumference of valve block is provided with valve screw thread 14, through valve screw thread 14 is fixed with 1 hole screw thread 10 threaded connection of oil sheathed tube body, runner 11 and valve pocket 15 have set gradually from the left hand right side in the valve block, runner 11 and valve pocket 15 intercommunication, be provided with spring 13 and valve head 12 in the valve pocket 15, the right-hand member of spring 13 and being connected of valve pocket 15, the left end is connected with valve head 12 right-hand member, the left end of valve pocket 15 is the conical surface, valve head 12 for with the conical surface matches the toper piece that uses, 15 right-hand members of valve pocket and 1 intercommunication of oil sheathed tube body.

Utilize the oil casing anti-reflux device of this application, can prevent that shaft bottom oil gas from upwelling along the tubular column hole is contrary under the pressure effect, be favorable to improving construction fail safe nature.

When the coupling type oil casing is used in a buckling assembly mode on site, a gap between a conventional elevator and a coupling is large and sways, the coupling cannot be buckled easily, a safety slip is clamped on the outer circle of the coupling to strengthen fixation, and the sawtooth-shaped slip teeth of the safety slip cannot clamp the smooth outer circle surface of the coupling easily; the design of the sawtooth supporting surface is beneficial to clamping and fixing the safety slip, and is convenient for field operation and construction.

Due to the design of the welding inclined plane, the risk point of failure of one thread is reduced, and the overall safe working efficiency of the product is effectively improved; the sealing conical surface design effectively improves the air sealing performance of the threaded joint and simultaneously ensures that the threaded joint can provide internal pressure resistance and connection strength equivalent to those of a pipe body under the condition of high composite bearing capacity;

The machinability is good, the labor time is saved, and the cost is also reduced; the quality control of large-scale production is guaranteed, the quality risk of the threaded connection part can be effectively reduced, the comprehensive quality safety coefficient of the whole oil jacket pipe column is improved, and the popularization and the development of products are facilitated; the tooth shape of the rectangular thread is wider, the axial load bearing capacity is strong, and the connection strength is high.

Wherein the outer diameter D of the product is 127.0 mm-479.4 mm.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides an oil casing prevents device against current which characterized in that includes: the valve block, the side circumference of valve block is provided with valve screw thread (14), through valve screw thread (14) are fixed with oil sheathed tube body (1) hole screw thread (10) threaded connection, runner (11) and valve pocket (15) have set gradually from left to right in the valve block, runner (11) and valve pocket (15) intercommunication, be provided with spring (13) and valve head (12) in valve pocket (15), the right-hand member of spring (13) and being connected of valve pocket (15), the left end is connected with valve head (12) right-hand member, the left end of valve pocket (15) is the conical surface, valve head (12) be with the conical surface cooperation conical surface piece that uses, valve pocket (15) and oil sheathed tube body (1) intercommunication.

2. An oil bushing, comprising: comprises a pipe body (1) internally threaded with an oil casing anti-backflow device as claimed in claim 1.

3. The oil casing according to claim 2, characterized by further comprising a coupling (2), wherein the pipe bodies (1) are connected through the coupling (2), a sawtooth supporting surface (4) is arranged in the middle of the outer circumference of the coupling (2), the sawtooth supporting surface (4) is in a sawtooth shape, the included angle a is 60 degrees, and the tooth height h is 2.5 mm.

4. An oil casing according to claim 3, characterized in that, the two ends of the coupling (2) have different structures, one end of the inner circumference of the coupling is provided with an internal thread (5) and an internal thread sealing conical surface (6), the inner circumference of the other end is provided with an internal inclined surface (3), the two ends of the pipe body (1) have different structures, the outer circumference of one end of the pipe body (1) is provided with an external thread (8) and an external thread sealing conical surface (7), the other end of the pipe body is provided with an external inclined surface (9), the external thread sealing conical surface (7) and the internal thread sealing conical surface (6) are respectively arranged at the front end of the external thread (8) and the rear end of the internal thread (5), and the external inclined.

5. An oil bushing according to claim 4, characterized in that the tooth profiles of the internal thread (5) and the external thread (8) are rectangular.

6. An oil bushing according to claim 5, characterized in that the teeth of the internal thread (5) and the external thread (8) are identical rectangular structures, the tooth height is 2.25mm, and the pitch P is 6.35 mm.