CN211666676U - Anti-creeping sealed insertion tube - Google Patents

Abstract

The utility model discloses a prevent sealed intubate of wriggling formula, including the center tube, the center tube upper end is connected with the top connection, and the center tube is outside from last to still having connected gradually elasticity screens short circuit and last seal cover down, and the center tube lower extreme still is connected with the lower extreme, wherein goes up seal cover and elasticity screens short circuit threaded connection, and wherein the top connection lower extreme has still opened spacing spline, and elasticity screens short circuit outer wall still has outside outstanding slot boss screens key. In the process that the anti-creeping sealed insertion tube creeps upwards, due to the limitation of the slot boss clamping key and the alignment clamping groove on the expansion tube, the elastic clamping short section, the sealing sleeve and the sealing rubber sleeve slide downwards on the central tube and return to the original position again after creeping downwards, so that the insertion tube sealing mechanism and the expansion tube are kept in a relatively static state, and the sealing failure caused by the creeping of the tubular column is avoided.

Description

Anti-creeping sealed insertion tube

Technical Field

The utility model belongs to the technical field of oil field development, concretely relates to sealed intubate of anti-creep formula.

Background

After an oil well is broken in a production process, effective treatment needs to be carried out in order to timely recover production, the situation that a casing is corroded and perforated, and a large section of the inner wall is corroded and leaked is solved. However, the existing expansion pipe back-inserting and separate mining process has two types of bottom back-inserting and top back-inserting, but the creeping of the pipe column cannot be prevented, so that the sealing and pressure-bearing effect is poor, and the time is shortened. In addition, the bottom back-inserting process of the expansion pipe needs to preset a sealing inserting barrel, an overflowing channel in the sealing inserting pipe is small and easy to block, the anti-creeping capacity and the sealing effect cannot be guaranteed, and oil pipe measurement operation cannot be carried out in the later stage.

Disclosure of Invention

The utility model aims to provide a: aiming at the problems of the top and bottom back-inserting process of the expansion pipe patching back-inserting and isolating mining technology, the anti-creeping sealed insertion pipe which is simple in structure and can prevent creeping is provided, so that the insertion pipe sealing mechanism and the expansion pipe are kept in a relatively static state, the creeping resistance of the insertion pipe is improved, and the back-inserting and isolating mining sealed pressure-bearing effect is ensured.

The utility model aims at realizing through following technical means, a prevent sealed intubate of wriggling formula, including the center tube, the center tube upper end is connected with the top connection, and the center tube is outside from last to still having connected gradually elasticity screens short circuit and last seal cover down, and the center tube lower extreme still is connected with the lower extreme, wherein goes up seal cover and elasticity screens short circuit threaded connection, and wherein the top connection lower extreme has still opened spacing spline, and elasticity screens short circuit outer wall still has outside outstanding slot boss screens key.

And sealing ring grooves are formed in the inner wall and the outer wall of the upper sealing sleeve, and O-shaped sealing rings are connected in the sealing ring grooves.

The lower end of the upper sealing sleeve is connected with a lower sealing sleeve, the thickness of the lower sealing sleeve is smaller than that of the upper sealing sleeve, and the inner wall and the outer wall of the lower sealing sleeve are both connected with sealing rubber sleeves.

The surface of the sealing rubber sleeve is of a concave-convex alternate structure.

The sealing rubber sleeve is connected to the inner wall and the outer wall of the lower part of the upper sealing sleeve through vulcanization.

The center tube is made of stainless steel.

The invention has the beneficial effects that: 1. the surface of the sealing rubber sleeve is of a concave-convex alternate structure, so that the rubber sleeve is convenient to fill and seal, and meanwhile, the phenomenon that the rubber sleeve deforms or falls off from the sealing sleeve due to the fact that the rubber sleeve is too large in adhesion force between the rubber sleeve and corresponding sealing surfaces (the outer wall of the central pipe and the inner wall of the expansion pipe) due to the fact that the pipe column creeps can be prevented.

2. In the process that the anti-creeping sealed insertion tube creeps upwards, due to the limitation of the slot boss clamping key and the alignment clamping groove on the expansion tube, the elastic clamping short section, the sealing sleeve and the sealing rubber sleeve slide downwards on the central tube and return to the original position again after creeping downwards, so that the insertion tube sealing mechanism and the expansion tube are kept in a relatively static state, and the sealing failure caused by the creeping of the tubular column is avoided.

Drawings

FIG. 1 is a schematic view of a creep-resistant sealed cannula;

FIG. 2 is a schematic view of the anti-creep sealed cannula after insertion into the inflation tube;

in the figure 11, the upper joint; 12. a central tube; 13. an elastic clamping short section; 14. sealing sleeves; 15. sealing the rubber sleeve; 16. a lower joint; 17. limiting splines; 18. a slot boss clamping key; 19. a lower sealing sleeve; 20. an O-shaped sealing ring; 21. a creep-resistant sealed cannula; 22. and (4) expanding the tube.

The present invention will be described in further detail with reference to the accompanying drawings and examples.

Detailed Description

[ example 1 ]

As shown in fig. 1 and 2, the anti-creeping sealed insertion tube comprises a central tube 12, wherein the upper end of the central tube 12 is connected with an upper joint 11, the outside of the central tube 12 is sequentially connected with an elastic short clamping joint 13 and an upper sealing sleeve 14 from top to bottom, the lower end of the central tube 12 is further connected with a lower joint 16, the upper sealing sleeve 14 is in threaded connection with the elastic short clamping joint 13, the lower end of the upper joint 11 is further provided with a limiting spline 17, and the outer wall of the elastic short clamping joint 13 is further provided with a cutting boss clamping key 18 protruding outwards.

The upper end of the central pipe 12 is in threaded connection with an upper joint, the lower end of the central pipe 12 is in threaded connection with a lower joint 16, the central pipe 12 is further sequentially connected with an elastic clamping short joint 13 and an upper sealing sleeve 14 from top to bottom, wherein the upper end of the elastic clamping short joint 13 is in threaded connection with the lower end of the upper joint, the elastic clamping short joint 13 is in threaded connection with the upper sealing sleeve 14, the lower end of the upper joint 11 is further provided with a limiting spline 17, the limiting spline 17 is used for abutting against the upper end of an expansion pipe 22 when the expansion pipe 22 is inserted, the creep-resistant type creep-resistant sealing insertion pipe 21 is prevented from being continuously inserted, and a slotting boss clamping key 18 on the elastic clamping short joint 13 is clamped into an alignment clamping groove in a return-insertion.

In the process of upward creeping of the creep-preventing type sealing insertion tube 21, due to the limitation of the slotted boss clamping key 13 and the alignment clamping groove on the expansion tube 22, the elastic clamping short section 13, the sealing sleeve and the sealing rubber sleeve 15 slide downwards on the central tube and return to the original position again after creeping downwards, so that the insertion tube sealing mechanism and the expansion tube 22 are kept in a relatively static state, and sealing failure caused by creeping of a tube column is avoided.

[ example 2 ]

As shown in fig. 1 and 2, in embodiment 1, the inner and outer walls of the upper sealing boot 14 are both provided with sealing ring grooves, and O-rings 20 are connected in the sealing ring grooves. Sealing rings on the inner wall seal against the upper gland 14 and the central tube 12, and sealing rings on the outer wall seal against the outer wall of the upper gland 14 and the inner wall of the expansion tube 22.

The lower end of the upper sealing sleeve 14 is connected with a lower sealing sleeve 19, the thickness of the lower sealing sleeve 19 is smaller than that of the upper sealing sleeve 14, and the inner wall and the outer wall of the lower sealing sleeve 19 are both connected with sealing rubber sleeves 15.

The lower end of the upper sealing sleeve 14 is connected with a lower sealing sleeve 19 which are integrally formed, the thickness of the lower sealing sleeve 19 is smaller than that of the upper sealing sleeve 14 and is connected in the middle of the upper sealing sleeve 14, so that a space is reserved between the inner wall of the lower sealing sleeve 19 and the outer wall of the central tube 12, a space is also reserved between the outer wall of the lower sealing sleeve 19 and the inner wall of the expansion tube 22, and sealing rubber sleeves 15 are connected to the inner wall and the outer wall to fill the reserved space.

The surface of the sealing rubber sleeve 15 is of a concave-convex alternate structure.

The sealing rubber sleeve 15 is connected to the inner wall and the outer wall of the lower part of the upper sealing sleeve 14 through vulcanization.

So that when the anti-creeping sealing cannula 21 is inserted into the expansion pipe 22, the sealing rubber sleeve 15 on the outer wall of the lower sealing sleeve 19 is matched and sealed with the inner wall of the expansion pipe 22.

The sealing rubber sleeve 15 is connected to the inner wall and the outer wall of the lower sealing sleeve 19 in a vulcanization mode, the surface of the sealing rubber sleeve 15 is of a concave-convex alternate structure, the rubber sleeve is convenient to fill and seal, and meanwhile, the phenomenon that the rubber sleeve deforms or falls off from the upper sealing sleeve 14 and the lower sealing sleeve 19 due to the fact that the rubber sleeve and a corresponding sealing surface, namely the outer wall of the central tube 12 and the inner wall of the expansion tube 22, are too large in adhesion force caused by the creeping of a tubular column can be prevented.

The central tube 12 is made of stainless steel. And the outer surface is treated by rust-proof chromium plating.

The minimum inner diameter of the central tube 12 is the minimum inner diameter of the cannula, and is the same as the inner diameter of the completion oil tube without reducing diameter.

When the expansion pipe is used, as shown in fig. 2, the expansion pipe 22 is subsidized to a predetermined sleeve leakage pipe position through the subsidizing device, after the lower part of the completion pipe string is connected with the telescopic anti-creeping sealing insertion pipe 21 and is inserted into the back insertion sealing section on the inner side of the upper part of the expansion pipe 22, the lower end of the limiting spline 17 on the upper joint 11 is in contact limiting with the upper edge of the expansion pipe, and meanwhile, the slot boss clamping key 18 on the elastic clamping short section 13 is clamped into the alignment clamping groove in the back insertion sealing section of the expansion pipe. The limiting spline 17 on the upper joint 11 is mainly used for judging whether the inserting pipe is inserted back to the place according to the change of the hanging weight of the pipe column after the inserting pipe is inserted to the place. Meanwhile, after the slot boss clamping key 18 on the elastic clamping short section 13 is clamped into the alignment clamping groove in the expansion pipe back-insertion sealing section, the whole of the upper sealing sleeve 14 and the lower sealing sleeve 19 of the insertion pipe and the sealing rubber sleeve 15 and the expansion pipe can be ensured to be in a static sealing state, the creeping of the pipe column is converted into the creeping sealing of the inner surfaces of the upper sealing sleeve 14, the lower sealing sleeve 19 and the sealing rubber sleeve 15 and the rust-proof chromium-plated central pipe 12, and the creeping between the insertion pipe and the expansion pipe 22 is converted into the creeping inside of the insertion pipe. The lower end of the sealed insertion pipe can be connected with a tail pipe, a sieve pipe, a plug and the like according to a specific design scheme.

During construction, firstly, the expansion pipe 22 patching device is placed into a shaft according to a design scheme to design a patching position, then, ground is pressed according to a patching process to complete patching, so that the expansion pipe 22 is anchored with the inner wall of the sleeve in a sealing manner, and after patching is completed, the lower sliding block fishing spear is used for fishing out the bottom plug. And then connecting the anti-creeping sealed insertion pipe 21 with a well completion pipe string according to the design and putting the pipe string into the well, slowly putting the pipe string when the insertion pipe is about 30m away from the upper edge of the expansion pipe until the hanging weight of the pipe string descends by about 5t (the maximum resistance of the slotting boss clamping key 17 entering the expansion pipe is 1 t), and the hanging weight does not increase, which indicates that the lower end of the limiting spline 17 on the upper joint is propped against the upper edge of the expansion pipe 22 at the moment, and simultaneously the slotting boss clamping key 18 on the elastic clamping short section 12 is clamped into the aligned clamping groove in the reinsertion sealing section of the expansion pipe 22, and then lifting the pipe string to descend by 2t to complete the reinsertion of the insertion pipe. At the moment, the upper oil sleeve annulus is separated from the oil layer, and the broken water of the upper stratum sleeve can only be stored in the oil sleeve annulus and is not communicated with the oil layer any more, so that the back-inserting and separate production is realized, and the productivity of the oil well is ensured to be effectively exerted.

If the oil well needs to examine the pump or when taking measures the operation, need not to salvage or handle expansion pipe 22, only need increase 2~3KN pulling force on the basis of former tubular column hanging weight, extract the intubate and play the production tubular column (hanging weight resumes to former hanging weight after when extracting the intubate, the hanging weight just can increase after the tubular column still need go upward about 1m, this is mainly because seal cover and sealed gum cover 15 need slide down to central tube 12 lower extreme and top in the lower clutch upper end after, the pulling force of tubular column can only transmit to elasticity screens nipple 13), after accomplishing the operation, go into the well again after inspection and the maintenance scalable intubate sealing member and to inserting sealed, continue to separate to adopt production can.

Claims (6)

1. A creep-resistant sealed cannula, comprising: including center tube (12), center tube (12) upper end is connected with top connection (11), center tube (12) outside from last to still being connected gradually elasticity screens short circuit (13) and last seal cover (14) down, center tube (12) lower extreme still is connected with lower clutch (16), wherein go up seal cover (14) and elasticity screens short circuit (13) threaded connection, wherein top connection (11) lower extreme has still opened spacing spline (17), elasticity screens short circuit (13) outer wall has outside outstanding slot boss screens key (18) in addition.

2. A creep resistant sealed cannula according to claim 1, wherein: and sealing ring grooves are formed in the inner wall and the outer wall of the upper sealing sleeve (14), and O-shaped sealing rings (20) are connected in the sealing ring grooves.

3. A creep resistant sealed cannula according to claim 1 or 2, wherein: go up seal cover (14) lower extreme and be connected with lower seal cover (19), lower seal cover (19) thickness is less than last seal cover (14), and lower seal cover (19) inner wall and outer wall all are connected with sealed gum cover (15).

4. A creep resistant sealed cannula according to claim 3, wherein: the surface of the sealing rubber sleeve (15) is of a concave-convex alternate structure.

5. A creep resistant sealed cannula according to claim 3, wherein: the sealing rubber sleeve (15) is connected to the inner wall and the outer wall of the lower part of the upper sealing sleeve (14) through vulcanization.

6. A creep resistant sealed cannula according to claim 1, wherein: the central tube (12) is made of stainless steel.

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