CN218625389U

CN218625389U - Wellhead pipe string tie-back device

Info

Publication number: CN218625389U
Application number: CN202222882439.4U
Authority: CN
Inventors: 赵岩; 冯文龙; 孟祥斌; 杨树江; 高焕文
Original assignee: Tianjin Boshiqi Petroleum Engineering Technology Co ltd
Current assignee: Tianjin Boshiqi Petroleum Engineering Technology Co ltd
Priority date: 2022-10-31
Filing date: 2022-10-31
Publication date: 2023-03-14
Anticipated expiration: 2032-10-31

Abstract

The utility model discloses a well head tubular column tie-back device, which belongs to the technical field of petroleum industry and comprises a retractable slip overshot, a sealing mandrel, a sealing device and an oil pipe, wherein the sealing device comprises a sealing outer cylinder, a sealing piston, a push ring and an expansion rubber cylinder; the sealing mandrel with the cover of oil pipe junction is equipped with sealing device, and is concrete, sealed urceolus cover is established sealed mandrel with oil pipe grafting department, sealed urceolus inner chamber cover is equipped with the throw-out collar, throw-out collar both sides space forms first cavity and second cavity, first cavity endotheca is equipped with sealed piston, just sealed piston with the throw-out collar offsets, the cover is equipped with in the second cavity the inflation packing element. The problem of lack effective locking structure among the prior art, poor stability has the advantage that the leakproofness is strong, improves staff's operating efficiency is solved.

Description

Well head tubular column tie-back device

Technical Field

The utility model relates to a petroleum industry technical field, concretely relates to well head tubular column tie-back device.

Background

In recent years, coiled tubing machines are increasingly used due to convenient operation, short operation time and remarkable economic benefit in the maintenance process of oil and gas wells. With the popularization and application of coiled tubing devices, coiled tubing fractures sometimes occur in oil and gas wells. Because coiled tubing presents the characteristics of small outer diameter, thin wall, large flexibility and easy deformation, and the shape of the coiled tubing is mostly irregular after the coiled tubing is broken, the operation is limited by adopting a conventional fishing mode, the fishing effect is poor, and the fishing success rate is low.

Among the current literature, patent application No. CN201520916961.7, the name is a coiled tubing overshot, and it has realized the function of salvaging oil pipe through set up rotatory tooth piece at the overshot inner wall, but still has a great deal of problem among the prior art: (1) The fishing barrel has poor sealing performance, can only meet the fishing operation of the oil pipe, but cannot keep sealing so as to facilitate the subsequent operations such as well washing and the like; (2) The fishing barrel is not connected in a tie-back mode, an effective locking structure is lacked, the pipe column can move when the fishing barrel is under pressure, the sealing effect is influenced, and fishing failure is easy to occur.

Therefore, how to provide a wellhead tubular column tie-back device to realize the high-efficient salvage to the fracture oil pipe is the technical problem that technical personnel in the field need to solve urgently.

SUMMERY OF THE UTILITY MODEL

Therefore, the utility model provides a well head tubular column tie-back device to solve among the prior art oil pipe fishing barrel leakproofness poor, lack the problem of effective locking structure.

In order to achieve the above object, the present invention provides the following technical solutions:

according to the utility model provides a well head tubular column tie-back device, which comprises a retractable slip overshot, a sealing mandrel, a sealing device and an oil pipe, wherein the slip overshot is positioned at the upper end of the sealing mandrel and is detachably connected with the sealing mandrel; the upper end of the oil pipe is inserted into the lower end of the sealing mandrel, and the sealing device is sleeved at the joint of the sealing mandrel and the oil pipe.

Further, the sealing device comprises a sealing outer cylinder, a sealing piston, a push ring and an expansion rubber cylinder, the sealing outer cylinder is sleeved at the splicing position of the sealing mandrel and the oil pipe, the push ring is sleeved in an inner cavity of the sealing outer cylinder, a first cavity and a second cavity are formed in the space on two sides of the push ring, the sealing piston is sleeved in the first cavity and abuts against the push ring, and the expansion rubber cylinder is sleeved in the second cavity;

the sealing outer barrel is provided with a thread opening communicated with the first chamber _。 Furthermore, the sealing piston comprises a sealing part far away from the push ring and a reducing part close to the push ring, the inner wall of the sealing part is in sealing contact with the outer wall of the sealing mandrel, the outer wall of the sealing part is in sealing contact with the inner wall of the sealing outer barrel, the reducing part is abutted to the push ring, and when the sealing outer barrel is pressed, the reducing part is movably pushed in the sealing outer barrel along the vertical direction to extrude the push ring to extrude the expansion rubber barrel.

Further, the upper end of the sealing outer barrel is in threaded connection with the sealing mandrel, the lower end of the sealing outer barrel is bent by 90 degrees and is bent inwards to form a step surface, and an inner ring of the step surface is attached to the oil pipe.

Further, the expansion rubber cylinder comprises a middle rubber cylinder and two side rubber cylinders, and the middle rubber cylinder is located between the two side rubber cylinders.

Further, the O-shaped rings comprise a first O-shaped ring, a second O-shaped ring and a third O-shaped ring, the first O-shaped ring is wound between the sealing mandrel and the sealing outer cylinder, the second O-shaped ring is wound between the sealing mandrel and the inner wall of the sealing portion, and the third O-shaped ring is wound between the outer wall of the sealing portion and the inner wall of the sealing outer cylinder.

Furthermore, a gap is reserved between the reducing part and the sealing outer cylinder, and a gap is reserved between the reducing part and the sealing mandrel.

Further, the step surface is provided with an annular horn mouth.

The utility model has the advantages of as follows:

1. the O-shaped ring and the sealing device are adopted, the oil pipe can be movably inserted up and down after being connected back, the high-pressure sealing effect is achieved, and the sealing performance is good; just the utility model discloses simple structure, convenient operation is applicable to the sleeve pipe tieback of all kinds of wells.

2. Be provided with the inflation packing element in the sealing device, realized preventing that tie-back oil pipe from being scurried on the pressure, stability is high, prevents to insert oil pipe back and rotates, has overcome the not enough that lacks effective locking structure among the prior art.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.

The structure, ratio, size and the like shown in the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by people familiar with the technology, and are not used for limiting the limit conditions which can be implemented by the present invention, so that the present invention has no technical essential significance, and any structure modification, ratio relationship change or size adjustment should still fall within the scope which can be covered by the technical content disclosed by the present invention without affecting the efficacy and the achievable purpose of the present invention.

Fig. 1 is a schematic view of a cross-sectional structure of a wellhead tubular column tie-back device provided by the present invention;

fig. 2 is a schematic view of a sealing device provided by the present invention;

in the figure: 1. a retractable slip overshot; 2. sealing the mandrel; 3. a sealing device; 301 sealing the outer cylinder; 302, spirally tapping; 303 sealing the piston; 3031 a sealing part; 3032 reducing the diameter; 304, pushing a ring; 305 expanding the rubber cylinder; 3051 edge packing element; 3052, a rubber cylinder; 306 a first O-ring; 307 a second O-ring; 308 a third O-ring; 4. an oil pipe.

Detailed Description

The present invention is described in terms of specific embodiments, and other advantages and benefits of the present invention will become apparent to those skilled in the art from the following disclosure. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in figure 1, the embodiment of the application provides a well head tubular column tie-back device, aims at solving the leakproofness that exists among the prior art poor, lacks effective locking structure scheduling problem, and through the structure of this application, it is good to have realized grafting oil pipe leakproofness, and locking structure stability is high, has avoided oil pipe to insert the back and has rotated the scheduling problem.

As shown in fig. 1, the slip overshot specifically comprises a retractable slip overshot 1, a sealing mandrel 2, a sealing device 3 and an oil pipe 4, wherein the slip overshot 1 is positioned at the upper end of the sealing mandrel 2 and is detachably connected with the sealing mandrel 2; the upper end of the oil pipe 4 is inserted at the lower end of the sealing mandrel 2, and the sealing device 3 is sleeved at the joint of the sealing mandrel 2 and the oil pipe 4. In the embodiment, the retractable slip overshot 1 is detachably connected with the sealing mandrel 2, so that the sealing device 3 with the corresponding size is selected according to the size of the oil pipe 4 in the well; the oil pipe 4 passes through the inner cavity of the sealing device 3, and the upper end of the oil pipe is inserted at the lower end of the sealing mandrel 2.

Wherein, sealing device 3 includes sealed urceolus 301, screw thread trompil 302, sealed piston 303, throw-out collar 304 and inflation packing element 305, sealed urceolus 301 cover is established sealed dabber 2 with oil pipe 4 grafting department, sealed urceolus 301 inner chamber cover is equipped with throw-out collar 304, throw-out collar 304 both sides space forms first cavity and second cavity, the cover is equipped with in the first cavity sealed piston 303, just sealed piston 303 with throw-out collar 304 offsets, the second cavity endotheca is equipped with inflation packing element 305.

A spiral opening 302 is further formed in the sealing outer cylinder 301, and the spiral opening 302 is communicated with the first chamber; specifically, the threaded opening 302 is used for installing a pressure test connector and connecting a pressure test pump to pressurize the first chamber;

compared with the prior art, the sealing device 3 of this application, sealing piston 303 is including keeping away from the sealing portion 3031 of push ring 304 with being close to push ring 304's reducing portion 3032, sealing portion 3031 inner wall with sealing mandrel 2 outer wall sealing contact, sealing portion 3031 outer wall with sealing urceolus 301 inner wall sealing contact, reducing portion 3032 with push ring 302 offsets, and during the pressurized, reducing portion 3032 is in sealing urceolus 301 is along upper and lower direction activity promotion push ring 304 extrusion expansion rubber cylinder 305, expansion rubber cylinder 305 receives the extrusion inflation, embraces tight oil pipe 4, forms oil pipe 4 external seal.

Wherein, be provided with the screw thread on the sealed urceolus 301, with 2 threaded connection of sealed dabber, sealed urceolus 301 lower extreme is 90 degrees crooked inboard and forms the step face, step face inner ring with the laminating of oil pipe 4, the step face sets up to ring horn mouth, and the oil pipe 4 of being convenient for is pegged graft into sealing device 3.

The expansion packing element 305 includes well packing element 3051 and limit packing element 3052, well packing element 3051 is located two in the middle of the limit packing element 3052, when receiving pressure extrusion, expansion packing element 305 expands, and limit packing element 3052 hugs closely oil pipe 4 and forms the annular space sealed.

In this embodiment, the O-rings of the present application include a first O-ring 306, a second O-ring 307, and a third O-ring 308, where the first O-ring 306 is wound between the sealing core shaft 2 and the sealing outer cylinder 301, the second O-ring 307 is wound between the sealing core shaft 2 and the inner wall of the sealing portion 3031, and the third O-ring 308 is wound between the outer wall of the sealing portion 3031 and the inner wall of the sealing outer cylinder 301, so that a sealed space is formed between the sealing core shaft 2 and the sealing portion 3031, and when the pressure is applied to the first chamber through the spiral air hole 302, the sealing portion 3031 can be pressed, so as to push the push ring 304.

The embodiment of the utility model provides a use as follows:

selecting a sealing device 3 with a corresponding size according to the size of an oil pipe 4 in a well, lowering the sealing device to connect with a feeding oil pipe 4, and fishing the oil pipe 4 through a retractable slip overshot 1;

step two, slowly lifting the oil pipe 4, pulling out the retractable slip overshot 1 and the sealing device 3 to a wellhead, connecting the sealing outer cylinder 301 with a pressure test pump, slowly pressurizing, starting expansion of the expansion rubber cylinder 305 in the second chamber, closing a stop valve to keep pressure, and keeping the annulus sealed, wherein the annular space between the retractable slip overshot 1 and the sealing device 3 and the oil pipe 4 is filled with the sealing rubber cylinder 305;

thirdly, connecting a circulating pipeline and a circulating pump to the upper end of the retreating type slip overshot 1, and starting the pump to circularly wash the well; after the circulation operation is finished, the operation is stopped, the stop valve of the pressure test pump is opened, the pressure is released, the expansion rubber sleeve 305 in the second chamber retracts after the second chamber is stood, and the sealing between the retreating type slip fishing barrel 1 and the sealing device 3 and the oil pipe 4 is released.

Although the invention has been described in detail with respect to the general description and the specific embodiments, it will be apparent to those skilled in the art that modifications and improvements can be made based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of this invention without departing from the spirit thereof.

Claims

1. A wellhead pipe string tie-back device is characterized by comprising a retractable slip overshot, a sealing mandrel, a sealing device and an oil pipe, wherein the slip overshot is positioned at the upper end of the sealing mandrel and is detachably connected with the sealing mandrel; the upper end of the oil pipe is inserted into the lower end of the sealing mandrel, and the sealing device is sleeved at the joint of the sealing mandrel and the oil pipe.

2. The wellhead string tie-back device according to claim 1, wherein the sealing device comprises a sealing outer cylinder, a sealing piston, a push ring and an expansion rubber cylinder, the sealing outer cylinder is sleeved at the joint of the sealing mandrel and the oil pipe, the push ring is sleeved in an inner cavity of the sealing outer cylinder, a first cavity and a second cavity are formed in the space on two sides of the push ring, the sealing piston is sleeved in the first cavity and abuts against the push ring, and the expansion rubber cylinder is sleeved in the second cavity;

the sealing outer barrel is provided with a first cavity, and the sealing outer barrel is provided with a thread opening communicated with the first cavity.

3. The wellhead string tieback device according to claim 2, wherein the sealing piston comprises a sealing portion far away from the push ring and a reducing portion close to the push ring, the inner wall of the sealing portion is in sealing contact with the outer wall of the sealing mandrel, the outer wall of the sealing portion is in sealing contact with the inner wall of the sealing outer cylinder, the reducing portion abuts against the push ring, and when the reducing portion is pressed, the reducing portion moves in the sealing outer cylinder in the vertical direction to push the push ring to extrude the expansion rubber cylinder.

4. The wellhead string tie-back device according to claim 3, wherein the upper end of the outer sealing barrel is in threaded connection with the sealing mandrel, the lower end of the outer sealing barrel is bent by 90 degrees and is bent inwards to form a step surface, and the inner ring of the step surface is attached to the oil pipe.

5. The wellhead string tie-back device according to claim 4, wherein the expansion rubber sleeve comprises a middle rubber sleeve and side rubber sleeves, and the middle rubber sleeve is positioned between the two side rubber sleeves.

6. The wellhead string tie-back device according to claim 5, further comprising a first O-ring, a second O-ring, and a third O-ring, the first O-ring being disposed around the sealing mandrel and the sealing outer cylinder, the second O-ring being disposed around the sealing mandrel and the sealing inner wall, and the third O-ring being disposed around the sealing outer wall and the sealing outer cylinder inner wall.

7. The wellhead string tieback device of claim 3, wherein a gap is provided between the reduced diameter portion and the outer seal barrel, and a gap is provided between the reduced diameter portion and the seal mandrel.

8. The wellhead string tie-back device according to claim 4, wherein the step surface is provided as an annular flare.