CN210317218U

CN210317218U - Annulus high-pressure fluid string tail pipe hanger

Info

Publication number: CN210317218U
Application number: CN201921196546.3U
Authority: CN
Inventors: 方坤贤
Original assignee: Renqiu Huabei Petroleum Huakun Drilling And Production Machinery Co Ltd
Current assignee: Renqiu Huabei Petroleum Huakun Drilling And Production Machinery Co Ltd
Priority date: 2019-07-27
Filing date: 2019-07-27
Publication date: 2020-04-14
Anticipated expiration: 2029-07-27

Abstract

The utility model belongs to the technical field of drilling equipment, provided and prevented annular space high pressure fluid cluster liner hanger for hang the tail pipe in the sleeve pipe lower part, including the body, still establish a plurality of seal assembly at tail pipe and bushing department including establishing in proper order, the queue lower extreme that a plurality of seal assembly constitutes is provided with keeps off the piece, keeps off the fixed cover of piece and establishes in the body outside, and every seal assembly all establishes the rubber seal spare at tail pipe and bushing department including the cover, and the rubber seal spare outside cover is equipped with the metal expansion spare. Through the technical scheme, the problem that the annular high-pressure fluid string is formed and the well cementation quality is affected after the isolation type liner hanger in the prior art is used for a long time due to the poor sealing effect on the annular space is solved.

Description

Annulus high-pressure fluid string tail pipe hanger

Technical Field

The utility model belongs to the technical field of drilling equipment, a prevent annular space high pressure fluid cluster liner hanger is related to.

Background

In the process of well drilling and completion, in order to separate different geological strata and prevent collapse of a well wall caused by different stratum pressures, one or more layers of sleeves are required for well cementation, each layer of sleeves is cemented by cement, an annular space is formed between each layer of sleeves, and the annular space is filled therein and can generate annular high pressure due to expansion with heat and contraction with cold under the influence of temperature during production. The tail pipe hanger is a downhole tool for hanging a tail pipe on an upper casing string, is one of casing accessories, and realizes tail pipe hanging and annular sealing by using the packing type tail pipe hanger, so that a large amount of casing, cement and construction cost can be saved, the load of a drilling machine is reduced, the construction pressure is reduced, and an oil-gas layer is protected. In the prior art, the sealing effect of the isolation type liner hanger on an annular space is poor after the isolation type liner hanger is used for a long time, and annular high-pressure fluid strings can be formed to influence the well cementation quality.

SUMMERY OF THE UTILITY MODEL

The utility model provides a prevent annular space high pressure liquid cluster liner hanger has solved among the prior art sealed effect poor to the annular space after the long-time use of packer formula liner hanger to make annular space high pressure liquid cluster, influence the problem of well cementation quality.

The technical scheme of the utility model is realized like this: the sealing device comprises a body and a plurality of sealing assemblies sequentially sleeved at the joint of a tail pipe and a sleeve, wherein a stopper is arranged at the lower end of a queue formed by the plurality of sealing assemblies, the stopper is fixedly sleeved at the outer side of the body, each sealing assembly comprises a rubber sealing element sleeved at the joint of the tail pipe and the sleeve, and a metal expansion element is sleeved at the outer side of the rubber sealing element.

Furthermore, a one-way locking device is arranged on the upper side of a queue formed by a plurality of sealing components, the one-way locking device comprises a locking short section fixedly arranged on the outer side of the body, the outer surface of the locking short section is provided with a locking part,

the sealing assembly is characterized by further comprising a one-way locking ring sleeved on the outer side of the locking short section, wherein ratchet teeth are arranged on the inner surface of the one-way locking ring, and the locking part is matched with the ratchet teeth to enable the one-way locking ring to move towards the sealing assembly in a one-way mode.

Further, the one-way locking ring is made of metal, a sleeve is sleeved on the outer side of the one-way locking ring, the outer surface of the one-way locking ring is connected with the inner wall of the sleeve, and the sleeve is made of rubber.

Further, the rubber seal is the ring form, and includes ring one, ring two and ring three that connect gradually along axial direction, ring one with ring three symmetry sets up the both ends of ring two, ring one with the ring three outside all is equipped with the metal inflation piece, the radius of ring two is greater than the radius of ring one.

Further, two metal expansion pieces between two adjacent rubber sealing pieces are sleeved with each other.

Further, the metal expansion piece is made of red copper.

The utility model discloses a theory of operation and beneficial effect do:

1. the utility model discloses in set up a plurality of seal assembly at tail pipe and bushing junction, when tail pipe and bushing finish need seal the annular space, promote seal assembly, the queue that a plurality of seal assembly make up moves along thrust direction, according to the direction of motion, the queue head that a plurality of seal assembly make up is the lower extreme, be provided with the fender piece because of the queue lower extreme that a plurality of seal assembly make up, prevent seal assembly from moving downwards, downward thrust produces pressure to seal assembly, rubber seal spare pressurized deformation, radial length increases, axial length reduces, rubber seal spare radial length increases, produce radial pressure to the metal inflation spare, the metal inflation spare warp, radial length increases, axial length reduces, realize the sealing to the annular space; the metal expansion piece does not rebound after being deformed, and the metal expansion piece is sleeved outside the rubber sealing piece, so that the deformation of the rubber sealing piece is guaranteed, the rebound is avoided, the permanent sealing of an annular space is realized, the problem of poor sealing effect after long-time use is avoided, and annular high-pressure liquid strings are avoided, so that the well cementation quality is ensured, the service life of an oil well is prolonged, and the yield of the oil well is improved.

A plurality of seal assembly overlaps in proper order and establishes and seal in tail pipe and bushing department, and seal assembly's number can increase and decrease as required, has improved the utility model discloses a commonality. Compared with a rubber sealing element, the metal expansion piece can bear high temperature and high pressure, has the characteristics of compression deformation and no rebound, and is favorable for ensuring the sealing effect; simultaneously, rubber seal spare is with low costs, establishes the metal inflation piece at the rubber seal spare outside cover, can make full use of the two advantage, under the prerequisite of guaranteeing sealed effect, reduce cost.

2. Promote seal assembly, the queue that a plurality of seal assembly constitutes moves along thrust direction, according to the direction of motion, the queue end that a plurality of seal assembly constitutes is the upside, set up one-way locking device at the queue upside that a plurality of seal assembly constitutes, one-way catch downstream, compress tightly seal assembly, realize permanent seal, because the locking part of locking the nipple joint and the mating reaction of ratchet, one-way catch no longer returns, one-way catch and fender piece are fixed respectively at the upside and the downside of the queue that a plurality of seal assembly constitutes, realize the locking to the seal assembly position, the poor problem of sealed effect that the seal assembly displacement caused has been avoided.

3. The sleeve made of rubber is sleeved outside the one-way locking ring, the friction force of the rubber is large, and the sleeve is conveniently stressed, so that the one-way locking ring is conveniently operated; meanwhile, the rubber material is low in price, so that the cost is reduced.

4. The metal expansion piece is respectively sleeved on the outer sides of the first ring and the third ring, and the second ring is exposed, so that the radial extension of the metal expansion piece is facilitated, and the sealing property is ensured; the second ring is exposed, and the radius of the second ring is larger than that of the first ring so as to ensure the sealing property of an annular space at the second ring; compared with a rubber sealing element, the metal expansion piece is relatively high in price, and the metal expansion piece is sleeved on the outer sides of the first ring and the third ring, so that the sealing performance is guaranteed, and meanwhile, the cost can be reduced.

5. Two metal expansion pieces between two adjacent rubber seal pieces are mutually sleeved, and the partial overlapping of the two metal expansion pieces is realized through the sleeving, so that the sealing performance of the joint of the metal expansion pieces can be further enhanced.

Drawings

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

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is an enlarged view of a portion A of FIG. 1;

in the figure: 1-body, 2-seal assembly, 21-rubber seal, 211-ring one, 212-ring two, 213-ring three, 22-metal expansion piece, 3-one-way locking device, 31-sleeve, 32-one-way locking ring, 33-locking nipple, 4-catch.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a single embodiment.

As shown in fig. 1-2, the sealing device comprises a body 1 and a plurality of sealing assemblies 2 sequentially sleeved at the joint of a tail pipe and a casing, wherein a stopper 4 is arranged at the lower end of a queue formed by the plurality of sealing assemblies 2, the stopper 4 is fixedly sleeved at the outer side of the body 1, each sealing assembly 2 comprises a rubber sealing element 21 sleeved at the joint of the tail pipe and the casing, and a metal expansion element 22 is sleeved at the outer side of the rubber sealing element 21.

The utility model discloses in set up a plurality of seal assembly 2 in tail pipe and bushing junction, when tail pipe and bushing finish need seal annular space, promote seal assembly 2, the queue that a plurality of seal assembly 2 are constituteed moves along thrust direction, according to the direction of motion, the queue head that a plurality of seal assembly 2 are constituteed is the lower extreme, be provided with fender piece 4 because of the queue lower extreme that a plurality of seal assembly 2 are constituteed, prevent seal assembly 2 to move downwards, downward thrust produces pressure to seal assembly 2, rubber seal 21 receives the compressive deformation, radial length increases, axial length reduces, rubber seal 21 radial length increases, produce radial pressure to metal expansion 22, metal expansion 22 warp, radial length increases, axial length reduces, realize the sealing to annular space; the metal expansion piece 22 does not rebound after deformation, and the metal expansion piece 22 is sleeved on the outer side of the rubber sealing piece 21, so that the deformation of the rubber sealing piece 21 is guaranteed, the rebound is avoided, the permanent sealing of an annular space is realized, the problem of poor sealing effect after long-time use is avoided, and annular high-pressure fluid clusters are avoided, thereby ensuring the well cementation quality, prolonging the service life of an oil well and improving the yield of the oil well.

A plurality of seal assembly 2 overlaps in proper order and establishes and seal in tail pipe and bushing department, and seal assembly 2's number can increase and decrease as required, has improved the utility model discloses a commonality. Compared with the rubber sealing element 21, the metal expansion element 22 can bear high temperature and high pressure, and the metal expansion element 22 has the characteristics of compression deformation and no rebound, so that the sealing effect is ensured; meanwhile, the rubber sealing element 21 is low in cost, the metal expansion piece 22 is sleeved on the outer side of the rubber sealing element 21, the advantages of the rubber sealing element and the metal expansion piece can be fully utilized, and the cost is reduced on the premise that the sealing effect is guaranteed.

Further, a one-way locking device 3 is arranged on the upper side of a queue formed by a plurality of sealing components 2, the one-way locking device 3 comprises a locking short section 33 fixedly arranged on the outer side of the body 1, a locking part is arranged on the outer surface of the locking short section 33,

the sealing assembly further comprises a one-way locking ring 32 sleeved on the outer side of the locking nipple 33, wherein ratchet teeth are arranged on the inner surface of the one-way locking ring 32, and the locking part is matched with the ratchet teeth to enable the one-way locking ring 32 to move towards the sealing assembly 2 in a one-way mode.

Promote seal assembly 2, the queue that a plurality of seal assembly 2 constitutes moves along thrust direction, according to the direction of motion, the queue end that a plurality of seal assembly 2 constitutes is the upside, queue upside that constitutes at a plurality of seal assembly 2 sets up one-way locking device 3, one-way catch 32 downstream, compress tightly seal assembly 2, realize permanent seal, because the cooperation of the locking portion of locking nipple joint and ratchet, one-way catch 32 no longer returns, one-way catch 32 fixes upside and the downside at the queue that a plurality of seal assembly 2 constitutes respectively with keeping off piece 4, realize the locking to seal assembly 2 position, the poor problem of sealed effect that the displacement of seal assembly 2 caused has been avoided.

Further, one-way lock ring 32 is the metal material, and one-way lock ring 32 outside cover is equipped with sleeve 31, and one-way lock ring 32 surface and sleeve 31 inner wall are connected, and sleeve 31 is the rubber material.

The sleeve 31 made of rubber is sleeved outside the one-way locking ring 32, the friction force of the rubber is large, and the sleeve 31 is conveniently stressed, so that the one-way locking ring 32 is conveniently operated; meanwhile, the rubber material is low in price, so that the cost is reduced.

Further, the rubber sealing element 21 is annular and comprises a first ring 211, a second ring 212 and a third ring 213 which are sequentially connected along the axial direction, the first ring 211 and the third ring 213 are symmetrically arranged at two ends of the second ring 212, the outer sides of the first ring 211 and the third ring 213 are both sleeved with the metal expansion element 22, and the radius of the second ring 212 is larger than that of the first ring 211.

The metal expansion piece 22 is respectively sleeved on the outer sides of the first ring and the third ring, and the second ring is exposed, so that the radial extension of the metal expansion piece 22 is facilitated, and the sealing property is ensured; the second ring is exposed, and the radius of the second ring is larger than that of the first ring so as to ensure the sealing property of an annular space at the second ring; the metal expansion member 22 is relatively expensive compared to the rubber seal member 21, and the metal expansion member 22 is only sleeved outside the ring one and the ring three, so that the cost can be reduced while the sealing performance is ensured.

Further, the two metal expansion members 22 between the adjacent two rubber seal members 21 are fitted to each other.

The two metal expansion pieces 22 between two adjacent rubber sealing elements 21 are sleeved with each other, and the two metal expansion pieces 22 are partially overlapped through the sleeving, so that the sealing performance of the joint of the metal expansion pieces 22 can be further enhanced.

Further, the metal expansion member 22 is made of red copper.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. Prevent annular space high pressure fluid cluster liner hanger for hang the tail pipe in the sleeve pipe lower part, including body (1), its characterized in that: the sealing device is characterized by further comprising a plurality of sealing assemblies (2) which are sequentially sleeved at the connection position of the tail pipe and the casing pipe, wherein blocking pieces (4) are arranged at the lower ends of queues formed by the plurality of sealing assemblies (2), the blocking pieces (4) are fixedly sleeved on the outer side of the body (1), each sealing assembly (2) comprises a rubber sealing element (21) sleeved at the connection position of the tail pipe and the casing pipe, and a metal expansion piece (22) is sleeved on the outer side of each rubber sealing element (21).

2. The anti-annulus high pressure string liner hanger of claim 1, wherein: a one-way locking device (3) is arranged on the upper side of a queue formed by a plurality of sealing components (2), the one-way locking device (3) comprises a locking short section (33) fixedly arranged on the outer side of the body (1), a locking part is arranged on the outer surface of the locking short section (33),

the sealing assembly is characterized by further comprising a one-way locking ring (32) sleeved on the outer side of the locking short section (33), wherein ratchet teeth are arranged on the inner surface of the one-way locking ring (32), and the locking part is matched with the ratchet teeth to enable the one-way locking ring (32) to move towards the sealing assembly (2) in a one-way mode.

3. The anti-annulus high pressure string liner hanger of claim 2, wherein: the one-way locking ring (32) is made of metal, a sleeve (31) is sleeved on the outer side of the one-way locking ring (32), the outer surface of the one-way locking ring (32) is connected with the inner wall of the sleeve (31), and the sleeve (31) is made of rubber.

4. The anti-annulus high pressure string liner hanger of claim 1, wherein: rubber seal (21) are the ring form, and include ring one (211), ring two (212) and ring three (213) that connect gradually along axial direction, ring one (211) with ring three (213) symmetry sets up the both ends of ring two (212), ring one (211) with ring three (213) outside all is equipped with metal expansion spare (22), the radius of ring two (212) is greater than the radius of ring one (211).

5. The anti-annulus high pressure string liner hanger of claim 1, wherein: two metal expansion pieces (22) between two adjacent rubber sealing pieces (21) are sleeved with each other.

6. The anti-annulus high pressure string liner hanger of claim 1, wherein: the metal expansion piece (22) is made of red copper.