CN208280936U

CN208280936U - The flexible gas gasket of common screw thread oil pipe hermetic seal

Info

Publication number: CN208280936U
Application number: CN201820868886.5U
Authority: CN
Inventors: 裴春来; 陆静兰
Original assignee: Nantong Zhongjie Petroleum Research Instrument Co Ltd
Current assignee: Nantong Zhongjie Petroleum Research Instrument Co Ltd
Priority date: 2018-06-05
Filing date: 2018-06-05
Publication date: 2018-12-25
Anticipated expiration: 2028-06-05

Abstract

The utility model discloses an elastic gas sealing gasket used for air sealing of ordinary threaded oil pipes. The elastic gas sealing gasket is in the shape of a cylinder as a whole and just fills in the "J-shaped area", thereby eliminating the disadvantage of eddy currents on the sealing performance. Affected, the wall surface of the elastic gas gasket is corrugated, and the two ends of the elastic gas gasket are respectively abutted against the end surfaces of the two male buckles. Under the action of external force, the distance between the two ends, that is, the elastic gas gasket The height of the gasket can be changed. When the height becomes smaller, the corrugations on the wall surface will be more dense, and it will be closer to the inner wall of the coupling, thereby enhancing the sealing effect at the connecting thread; in addition, the elastic gas gasket is It is placed directly in the oil pipe, so the elastic gas seal can be taken out of the oil pipe and reused, thereby further reducing the cost of use.

Description

The flexible gas gasket of common screw thread oil pipe hermetic seal

Technical field

The utility model relates to gas well, gas drive injection-production wells etc. the gasket used in well existing for gas medium, especially It is related to the flexible gas gasket of common screw thread oil pipe hermetic seal.

Background technique

In gas well, gas drive injection-production well, due to the presence of gas medium, the requirement to tubing seal ability is higher than commonly Oil, well；Nowadays use the tubing string of special hermetic seal button-type to improve tubing string mostly in gas well and gas drive injection-production well Sealability, but special button-type oil pipe cost is prohibitively expensive, considerably increases note and adopts cost, and due to special hermetic seal button-type The particularity of material generally requires to carry out whole replacements to oil pipe in recompletion operation.

Common screw thread oil pipe is also referred to as flat to buckle oil pipe, cheap, but since button-type limits, thread root and tooth peak Gap form potential leakage path, hermetic seal ability is limited, be often unable to satisfy note adopt during hermetic seal want It asks.Although the hermetic seal ability of flat button oil pipe can be improved by using high-performance thread sealing grease, due to the smearing of stop-leak compound Amount and smearing mode are distinctly claimed, and are restricted by On-the-spot factor and operating process, can not fully meet requirement, so that stop-leak compound Using effect be difficult to ensure.

Therefore, common flat button oil pipe is selected, and takes a kind of seal approach being simple and efficient, note can be greatly reduced Cost is adopted, note is improved and adopts efficiency；

In addition, when two common screw thread oil pipes in tubing coupling by fastening, as shown in fig. 1, female screw thread oil pipe/connect Hoop female thread 001 and public 002 box cupling of screw thread oil pipe are fixed, by the box face 003 and male silk of female screw thread oil pipe/box cupling female thread 001 The pin thread end face 005 and box cupling inner wall 004 for detaining oil pipe 002 form a groove, and the groove is generally referred to as " J-shaped in industry Area "；Gas is in oil pipe during flow at high speed, it will is formed and is vortexed in " J-shaped area ", generated under-voltage area, be unfavorable at screw thread Sealing；Even more serious, gas can generate erosion effect here, have an adverse effect to the sealing effect at female thread.

The present inventor has done depth to existing common screw thread oil pipe hermetic seal device and " J-shaped area " due to the above reasons, Enter research, goes out to be able to solve the completely new gasket of these problems to be designed.

Utility model content

In order to overcome the above problem, present inventor has performed sharp study, a kind of flexible gas gasket and close is designed Encapsulation method, the flexible gas gasket is integrally cylindrical, is just filled in " J-shaped area ", to eliminate vortex to sealing The wall surface of the adverse effect of performance, the flexible gas gasket is corrugated, which is connected to respectively On two pin thread end faces, under external force, the spacing between the both ends, i.e., the height of the described flexible gas gasket can be with It is varied, when its height becomes smaller, the ripple on wall surface is more intensive, and is more adjacent to box cupling inner wall, to enhance Sealing effect at connection screw thread；In addition, since the flexible gas gasket is directly placed in oil pipe, so the bullet Property gas seal can take out and reuse from oil pipe, use cost be further decreased, to complete the utility model.

Specifically, the purpose of this utility model is to provide with a kind of flexible gas of common screw thread oil pipe hermetic seal Gasket, the gasket include the elastic component 1 being mounted between pin thread end face 005 and box face 003.

Wherein, the elastic component 1 is cylindrical.

Wherein, the end of the elastic component 1 is abutted with pin thread end face and box face respectively.

Wherein, the cylinder-shaped wall surface of the elastic component 1 is abutted with box cupling inner wall 004.

Wherein, the deformation when end is squeezed of elastic component 1, cylindrical wall face out expansion, cylinder-shaped wall surface It is adjacent to box cupling inner wall 004；

The deformation when elastic component 1 is under pressure inside wall surface, the end are expanded to two sides, two end difference It is adjacent to pin thread end face 005 and box face 003.

Wherein, the elastic component 1 includes the side wall 3 between the end 2 and two ends 2 of both side ends；

The end 2 is annular in shape, squeezes side wall 3 for abutting with pin thread end face, and from both ends,

The longitudinal cross-section of the side wall 3 is corrugated.

Wherein, the ripple includes the arc section 4 and straightway 5 of alternately connection；The arc section 4 forms wave crest and wave Paddy；

Preferably, shape, the size of multiple arc sections 4 are all consistent；

Preferably, the size of multiple straightways 5 is consistent.

Wherein, the multiple straightway 5 is set parallel to each other.

Wherein, the end 2 is connected with the arc section 4 of side wall 3；

Preferably, which leans on 3 inner cavity of proximal wall.

The utility model also provide it is a kind of using flexible gas gasket described above to common screw thread oil pipe hermetic seal Method,

This method comprises the following steps:

Step 1: smearing stop-leak compound in the upper and lower ends of the flexible gas gasket；

Step 2: smearing stop-leak compound on the screw thread of common screw thread oil pipe；

Step 3: gasket being put into the inner connecting end of box cupling female thread, so that the end 2 of flexible gas gasket and box cupling The box face of female thread comes into full contact with；The side wall 3 of flexible gas gasket comes into full contact with the box cupling inner wall of box cupling female thread；

Step 4: the pin thread machine of public screw thread oil pipe tightly being held and screws in box cupling female thread and screws, is that oil pipe machine is tight by hydraulic tongs Upper button, the standard that oil pipe is tightened to setting tightens position, and guarantees that operating process is gentle, finally makes flexible gas gasket End 2 and the pin thread end face of public screw thread oil pipe come into full contact with；

Step 5: coordinating operation machine is directly gone into the well after buckleing on oil pipe, during underground work, pin thread end face and box end Face squeezes gasket from upper and lower two sides, while mine gas expansion squeezes gasket from inside to outside, real under dual external force Existing hermetic seal of the gasket to common screw thread oil pipe.

Beneficial effect possessed by the utility model includes:

(1) according to the flexible gas gasket and encapsulating method of common screw thread oil pipe hermetic seal provided by the utility model It can play the role of enhancing sealing by filling elastic component on the basis of not changing common screw thread oil pipe inherent structure, To realize the efficient sealed of low cost；

(2) according to the flexible gas gasket and encapsulating method of common screw thread oil pipe hermetic seal provided by the utility model Structure is simple, easy to operate, can obtain good sealing effect on the basis of increasing operator's labor intensity；

(3) according to the flexible gas gasket and encapsulating method of common screw thread oil pipe hermetic seal provided by the utility model Middle setting elastic component, which can either axially be adjacent to pin thread end face and box face, so that the elastic component It is fitted closely between pin thread oil pipe, female thread oil pipe, additionally it is possible to make in the side wall and box cupling of elastic component along radial direction Wall fits closely, and under the double action of internal gas pressure and external axial force, the above-mentioned fitting for fitting closely place is more firm Gu so that sealing effect is reliable and stable.

Detailed description of the invention

Fig. 1 shows structural schematic diagram when two common screw thread oil pipes in tubing coupling by fastening in the prior art；

Fig. 2 shows carry out common dope with flexible gas gasket according to a kind of preferred embodiment of the utility model The structural schematic diagram of pipe hermetic seal；

Fig. 3 shows the structural schematic diagram of the flexible gas gasket according to a kind of preferred embodiment of the utility model；

Fig. 4 shows the partial enlarged view of circled positions in Fig. 3；

Fig. 5 shows static pressure testing result table figure in embodiment；

Fig. 6 shows dynamic pressure testing result table figure in embodiment.

Drawing reference numeral explanation:

1- elastic component

The end 2-

3- side wall

4- arc section

5- straightway

Mother's 001- screw thread oil pipe/box cupling female thread

002- public affairs screw thread oil pipe

003- box face

004- box cupling inner wall

005- pin thread end face

Specific embodiment

The utility model is further described below by drawings and examples.Illustrated by these, this is practical new The characteristics of type and advantage will become more apparent from clear.

Dedicated word " exemplary " means " being used as example, embodiment or illustrative " herein.Here as " exemplary " Illustrated any embodiment should not necessarily be construed as preferred or advantageous over other embodiments.Although each of embodiment is shown in the attached drawings In terms of kind, but unless otherwise indicated, it is not necessary to attached drawing drawn to scale.

According to the flexible gas gasket of common screw thread oil pipe hermetic seal provided by the utility model, such as Fig. 2, Fig. 3 and Shown in Fig. 4, which includes the elastic component 1 being mounted between pin thread end face and box face.

The elastic component 1 is just filled in " J-shaped area ", eliminates the adverse effect of " J-shaped area " to tubing seal；Specifically For, when two common screw thread oil pipes in tubing coupling by fastening, as shown in fig. 1, female screw thread oil pipe/box cupling female thread 001 fixes with public 002 box cupling of screw thread oil pipe, by the box face 003 and male screw thread oil pipe of female screw thread oil pipe/box cupling female thread 001 002 pin thread end face 005 and box cupling inner wall 004 form a groove, and the groove is generally referred to as " J-shaped area " in industry；Gas In oil pipe during flow at high speed, it will formed and be vortexed in " J-shaped area ", generate under-voltage area, under-voltage area can destroy neighbouring spiral shell Line seal area eliminates vortex and under-voltage area, makes naturally after the described elastic component is filled in " the J-shaped area " The sealing effect and service life in thread seal area are enhanced.

Preferably, the elastic component 1 is whole cylindrical, outer diameter and mother's screw thread oil pipe/box cupling female thread 001 Internal diameter at box cupling inner wall 004 is consistent, the internal diameter of the internal diameter of the elastic component 1 and public screw thread oil pipe 002 Unanimously, it so that the fluid flow rate flowed therethrough is stablized, avoids generating vortex.

Preferably, the end of the elastic component 1 is abutted with pin thread end face and box face respectively, and is deposited each other In biggish contact area, contact surface is smooth, and contact is close, and in the case where being pressed against each other, contact surface is in seal shape State.

Preferably, the cylinder-shaped wall surface of the elastic component 1 is abutted with box cupling inner wall, the wall surface tool of the elastic component 1 It is flexible, it can more closely be attached on box cupling inner wall under external force, protect the threaded connection near box cupling inner wall close Seal region.

In one preferred embodiment, the deformation when end is squeezed of elastic component 1, cylindrical wall towards Outer expansion, cylindrical wall face paste immediately bind round inner wall；

The deformation when elastic component 1 is under pressure inside wall surface, the end are expanded to two sides, two end difference It is adjacent to pin thread end face and box face,

When being all under pressure inside the end of the elastic component 1 and wall surface, the wall surface of elastic component is enabled to naturally It more closely is attached on box cupling inner wall, so that the end of elastic component is adjacent to pin thread end face and box face respectively.

The wall surface of elastic component 1 is made of steel disc, rubber, high molecular polymer elastomeric material, in the feelings of proof strength Has enough elasticity, toughness under condition.

The maximum outside diameter of the side wall 3 is having a size of 69~73mm, and the minimum diameter of the side wall 3 is having a size of 60~64mm.

In one preferred embodiment, the elastic component 1 includes positioned at the end 2 and two ends of both side ends Side wall 3 between 2；

The end 2 is annular in shape, for being abutted with pin thread end face, and from both ends extruding side wall 3, the end 2 it is interior Diameter size is consistent with the internal diameter of elastic component 1, and the outer diameter of the end 2 is consistent with the outer diameter of elastic component 1；

The height dimension of the end 2 is 3.2mm, and the internal diameter of end 2 is 60~64mm, the outer diameter of end 2 For 69~73mm.

Preferably, the internal diameter of end 2 is consistent with the cylindrical circular internal diameter of whole institute of elastic component 1, all basis Internal diameter design at the box cupling inner wall 004 of female screw thread oil pipe/box cupling female thread 001, so that internal flow is in flow process, For fluid cross-section without mutation, flow velocity is steady.

The longitudinal cross-section of the side wall 3 is corrugated, and the transversal cross-section of the side wall 3 is annular in shape；

The longitudinal cross-section refers to the section by tubular structure axis, and the transversal cross-section refers to perpendicular to tubular structure The section of axis.

In one preferred embodiment, as shown in Fig. 2, Fig. 3 and Fig. 4, the ripple includes the circle of alternately connection Segmental arc 4 and straightway 5；The arc section 4 forms wave crest and trough；It will not be connected directly each other between arc section and arc section, It will not be connected directly each other between straightway and straightway；

Preferably, shape, the size of multiple arc sections 4 are all consistent；Each arc section 4 is substantially mutually the same, so that It is uniformly contacted between side wall and box cupling inner wall 004, each other stress equalization；The more preferably described arc section is semicircle；

It is highly preferred that the inner radii of arc section 4 is having a size of 0.8~1.2mm；The outer radii of arc section 4 having a size of 1~ 1.7mm, the thickness of arc section are 0.2~0.5mm；

Preferably, the length dimension of multiple straightways 5 is consistent with each other, the thickness of multiple straightways also that This is consistent；So that the corrugated waveform that 3 longitudinal cross-section of side wall is in is waveform of uniform size, i.e., the described side wall 3 On be provided with uniform ripple struction, the size that each ripple outwardly protrudes is consistent, on the cylinder-shaped wall surface of elastic component 1 by Pressing force be uniformly distributed, i.e., the pressing force being subject on each ripple is consistent, elastic component wall surface entirety uniform force.

It is furthermore preferred that the size of multiple straightways 5 is consistent, the length value of multiple straightways 5 is all 1.7~ 2.1mm, the thickness value of straightway 5 are 0.2~0.5mm.

In one preferred embodiment, the multiple straightway 5 is set parallel to each other, i.e., straightway all with the circle The axis of tubular wall surface is vertical, so that each ripple is evenly distributed on side wall, it is ensured that uniform force.

Preferably, the end 2 is connected with the arc section 4 of side wall 3；The arc section 4 is complete, has enough pressure-bearing energy Power, convex structure are not easy to deform because of external force pressure；

Preferably, as shown in Fig. 3, Fig. 4, which leans on 3 inner cavity of proximal wall, and the cambered surface of the circular arc is towards side wall 3 Inside, can be to a greater degree outwardly against deformation, while to end 2 supported on both sides when by pressure from inside to outside；It is excellent End 2 described in selection of land and side wall 3 are integrally formed.

The utility model also provides a kind of airtight to common screw thread oil pipe using flexible gas gasket as described above The method of envelope,

This method comprises the following steps:

Step 1: smear stop-leak compound in the upper and lower ends of the flexible gas gasket, prevent gasket and pin thread end face, There is spin friction breakage under the action of torque in the excessive end for leading to gasket of box face frictional force；

Step 2: smearing stop-leak compound on the screw thread of common screw thread oil pipe, improve screw thread self seal ability, reduce screw thread Own frictional drag reduces labor intensity of operating staff；

Step 4: the pin thread machine of public screw thread oil pipe tightly being held and screws in box cupling female thread and screws, is that oil pipe machine is tight by hydraulic tongs Upper button, the standard that oil pipe is tightened to setting tightens position, and guarantees that operating process is gentle, finally makes flexible gas gasket End 2 and the pin thread end face of public screw thread oil pipe come into full contact with；The pin thread machine is tightly held and is screwed into mother on as male screw thread oil pipe One end in screw thread oil pipe.

Embodiment

According to the flexible gas gasket of common screw thread oil pipe hermetic seal provided by the utility model, which includes The elastic component 1 being mounted between pin thread end face 005 and box face 003, the elastic component 1 include being located at both side ends Side wall 3 between end 2 and two ends 2；The longitudinal cross-section of the side wall 3 is corrugated；The ripple includes alternately connecting Arc section 4 and straightway 5；

Shape, the size of multiple arc sections 4 are all consistent, and the inner radii of arc section 4 is having a size of 1mm；Arc section 4 Outer radii is 0.3mm having a size of 1.3mm, the i.e. thickness of arc section；

The size of multiple straightways 5 is consistent, and the length value of multiple straightways 5 is all 1.9mm, straightway 5 Thickness value is 0.3mm.

The height dimension of the end 2 is 3.2mm, and the internal diameter of end 2 is 62mm, and the outer diameter of end 2 is 71mm。

The maximum outside diameter of the side wall 3 is having a size of 71mm, and the minimum diameter of the side wall 3 is having a size of 62mm.

By the way that above-mentioned certain size parameter is arranged, so that the sealing effect of the gasket reaches optimum state, in static state It can works fine under pressure and dynamic pressure, it is ensured that the sealing effect of oil pipe, so that stable gas pressure in oil pipe, no gas leakage, Specifically, the gasket in the present embodiment 1 is mounted in common screw thread oil pipe,

Static pressure test is done to the oil pipe, pressure variation is as shown in Figure 5 in test:

As can be known from Fig. 5, under the action of 38-39Mpa pressure, which is able to maintain that good sealing effect, Without gas leakage in 2 hour inner oil tubes of test, pressure is stablized in oil pipe.

Dynamically pressure testing is done to the oil pipe again, test data such as following table one, pressure variation is as shown in Figure 6:

Table one

Time	Pressure (MPa)
		0:00	50.73
0:05	50.35
		0:10	50.03
0:15	49.83
		0:20	49.48
0:25	49.31
		0:30	48.95
0:35	48.78
		0:40	48.60
1:00	48.25
		1:30	47.90
2:00	47.73
		2:30	47.55
3:00	47.38
		3:30	47.20
4:00	47.03
		4:30	47.03
5:00	46.68
		5:30	46.68
6:00	46.54
		6:30	46.50
7:00	46.33
		7:30	46.33
8:00	46.33
		12:00	46.31

From in table one and Fig. 6 it is found that experienced 8 hours dynamic pressure act on after, which still is able to maintain Good sealing effect, without gas leakage in subsequent 4 hours inner oil tubes, pressure is stablized in oil pipe.

In the description of the present invention, it should be noted that term " on ", "lower", "inner", "outside", "front", "rear" etc. The orientation or positional relationship of instruction is to be merely for convenience of retouching based on the orientation or positional relationship under utility model works state State the utility model and simplify description, rather than the device or element of indication or suggestion meaning must have a particular orientation, with Specific orientation construction and operation, therefore should not be understood as limiting the present invention.

It combines preferred embodiment above the utility model is illustrated, but these embodiments are only models Example property, only play the role of illustrative.On this basis, a variety of replacements and improvement can be carried out to the utility model, these It each falls in the protection scope of the utility model.

Claims

1. An elastic gas gasket for air sealing of ordinary threaded oil pipes, characterized in that the gasket includes an elastic member (1) installed between the end surface (005) of the pin and the end surface (003) of the box.

2. A kind of elastic gas gasket for air sealing of ordinary threaded oil pipe according to claim 1, characterized in that,

The elastic member (1) is cylindrical.

3. A kind of elastic gas gasket for air sealing of common threaded oil pipe according to claim 2, characterized in that,

The ends of the elastic member (1) are in contact with the end faces of the male button and the female button respectively.

4. The elastic gas gasket for air sealing of a common threaded oil pipe according to claim 2, wherein:

The cylindrical wall surface of the elastic member (1) abuts against the inner wall (004) of the collar.

5. A kind of elastic gas gasket for air sealing of common threaded oil pipes according to any one of claims 1-4, characterized in that,

The elastic member (1) is deformed when the end is squeezed, the cylindrical wall surface expands outward, and the cylindrical wall surface is close to the inner wall of the coupling (004);

The elastic member (1) is deformed when pressure is applied inside the wall, and the ends expand to both sides, and the two ends are respectively attached to the end surface (005) of the male button and the end surface (003) of the female button.

6. The elastic gas gasket for air sealing of a common threaded oil pipe according to claim 1, wherein:

The elastic member (1) includes end pieces (2) located at the ends on both sides and a side wall (3) between the two end pieces (2);

The end (2) is in the shape of a ring, and is used to abut against the end face of the male buckle, and squeeze the side wall (3) from both ends,

The longitudinal section of the side wall (3) is corrugated.

7. The elastic gas gasket for air sealing of a common threaded oil pipe according to claim 6, wherein:

The corrugation includes arc segments (4) and straight segments (5) connected alternately; the arc segments (4) form crests and troughs;

The shapes and sizes of the plurality of arc segments (4) are consistent;

The dimensions of the plurality of straight line segments (5) are consistent.

8. The elastic gas gasket for air sealing of a common threaded oil pipe according to claim 7, wherein:

The plurality of straight line segments (5) are arranged parallel to each other.

9. The elastic gas gasket for air sealing of a common threaded oil pipe according to claim 7, wherein:

The end (2) is connected with the arc segment (4) of the side wall (3).

10. The elastic gas gasket for air sealing of ordinary threaded oil pipe according to claim 9, characterized in that,

The arc segment (4) is close to the inner cavity of the side wall (3).