CN111720090A

CN111720090A - Packer assembly capable of being unsealed and swelling in case of liquid

Info

Publication number: CN111720090A
Application number: CN202010496817.8A
Authority: CN
Inventors: 孙新; 海沙尔·哈里别克; 阿里木江·司迪克; 茹鲜古丽·艾山
Original assignee: Petrochina Co Ltd
Current assignee: Petrochina Co Ltd
Priority date: 2020-06-03
Filing date: 2020-06-03
Publication date: 2020-09-29

Abstract

The invention provides a packer assembly capable of being unsealed and swelling in case of liquid, which comprises: a liner tube; the rubber sleeve is sleeved outside the liner tube and is made of a rubber material which expands when meeting liquid. The technical scheme of the invention effectively solves the problem that the packer cannot be unset or has large outer diameter after unset when being inflated by liquid in the prior art, and is difficult to trip.

Description

Packer assembly capable of being unsealed and swelling in case of liquid

Technical Field

The invention relates to the technical field of oil and gas field development, in particular to a packer assembly capable of being unsealed and swelling in the presence of liquid.

Background

Horizontal wells have been used in various oil fields as an economical and effective completion for the development of low-permeability and ultra-low-permeability reservoirs. For an oil reservoir with bottom water, the fracturing is easy to communicate with the bottom water to cause water to flow out of a certain perforation section, so that high water content of the whole well produced liquid is caused, the horizontal well section is not fully used, and the development benefit is influenced.

The horizontal well isolation and production pipe column technology is one of key technologies for ensuring the stable production of the horizontal well, and requires a pipe column structure to have higher safety and to realize long-time effective isolation. At present, the packer that can be taken in commonly used has more stable operation performance of taking off, but sealed validity period is short, and the structure is complicated, pulls the center tube through external force when taking out, activates deblocking mechanism, and the packer damages easily when taking out. The existing packer capable of expanding in the presence of liquid is simple in structure, a rubber sleeve is sleeved on a central pipe column in the presence of liquid, the outer diameter of the rubber sleeve is consistent with that of a sleeve after the rubber sleeve expands in the presence of liquid, an oil sleeve annulus is sealed, and the service life is long. When the deblocking, directly pull the center tube, because the external diameter is great after the packing element inflation, carry that the string process card string risk is high and there is the pumping effect, well control risk and environmental protection risk are great.

Disclosure of Invention

The invention mainly aims to provide a packer assembly capable of achieving deblocking and swelling in the presence of liquid, and aims to solve the problems that a conventional removable packer in the prior art is short in sealing validity period and poor in deblocking performance in the presence of liquid.

In order to achieve the above object, the present invention provides a packer assembly for a releasable liquid-swellable seal, comprising: a liner tube; the rubber sleeve is sleeved outside the liner tube and is made of a rubber material which expands when meeting liquid.

Further, a deblocking fluid swellable packer assembly further comprises: the first retaining ring is positioned outside the liner tube and at the first end of the liner tube; the second retaining ring is detachably sleeved outside the liner tube and is positioned at the second end of the liner tube; the rubber sleeve is positioned between the first retaining ring and the second retaining ring.

Further, in the initial state, the height of the rubber sleeve is less than or equal to the height of the first guard ring or the height of the second guard ring, and the height of the rubber sleeve after encountering liquid is higher than the height of the first guard ring and the height of the second guard ring.

Further, the height of the first guard ring is the same as the height of the second guard ring.

Further, the second guard ring is provided with a first through hole, and the liner pipe is provided with a second through hole which is arranged corresponding to the first through hole.

Further, the packer assembly further comprises a central pipe and a shear pin, a groove is formed in the outer wall of the central pipe, the groove is correspondingly formed in the first through hole and the second through hole, and the shear pin can penetrate through the first through hole, the second through hole and the groove to fix the second retaining ring, the liner pipe and the central pipe together.

Further, the shear pins are made of soluble materials.

Further, the deblocking fluid-swellable packer assembly further comprises a seal disposed between the base tubular and the liner.

Further, an annular groove is disposed on the center tube, and the seal member is at least partially disposed within the annular groove.

Furthermore, but the deblocking meets liquid expanded packer subassembly still includes the connecting pipe, is provided with the external screw thread on the outer wall of center tube, the inner wall of connecting pipe be provided with the internal thread of external screw thread looks adaptation.

By applying the technical scheme of the invention, the packer assembly capable of deblocking and swelling in the presence of liquid can solve the problems of short effective period and poor deblocking performance of the conventional packer capable of being classified in the presence of liquid, and avoids the problems of horizontal well lying and even production halt caused by pipe column blocking due to poor deblocking performance of the packer.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 shows a schematic structural view of an embodiment of a deblocking fluid-swellable packer assembly according to the invention.

Wherein the figures include the following reference numerals:

10. a liner tube; 20. a rubber sleeve; 30. a first guard ring; 40. a second guard ring; 50. a central tube; 60. shearing the nails; 70. a seal member; 80. and (4) connecting the pipes.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

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

Exemplary embodiments according to the present application will now be described in more detail with reference to the accompanying drawings. These exemplary embodiments may, however, be embodied in many different forms and should not be construed as limited to only the embodiments set forth herein. It is to be understood that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art, in the drawings, the thicknesses of layers and regions are exaggerated for clarity, and the same devices are denoted by the same reference numerals, and thus the description thereof will be omitted.

As shown in fig. 1, the deblocking fluid-swellable packer assembly of this embodiment comprises: liner 10 and rubber casing 20. The rubber sleeve 20 is sleeved outside the liner tube 10, and the rubber sleeve 20 is made of rubber which expands when meeting liquid.

Use the technical scheme of this embodiment, packer subassembly includes bushing pipe 10 and rubber casing 20, when needs take out center tube 50, is provided with bushing pipe 10 between center tube 50 and the rubber casing 20, and when center tube 50 took out like this, rubber casing 20 was difficult to damage, and then has avoided the horizontal well problem of laying a well or even stopping production. The technical scheme of this embodiment has solved packer and the direct fit of center tube among the prior art effectively, and the problem of packer easy damage.

When unsealing, the connecting tube 80 and the central tube 50 are directly lifted up to cut the shear pin 60; the liner 10, rubber casing 20, first grommet 30 and second grommet 40 remain in the well due to friction between the rubber casing 20 and the casing. The grind shoe is re-run and the remaining components are drilled out. The liner tube 10, the first retaining ring 30 and the second retaining ring 40 are made of a material easy to drill and wear, including but not limited to aluminum alloy, polymer material (glass fiber reinforced plastic, PPBI, PI or PEEK), etc., the PPBI is polypropylene, the PI is polyimide, and the PEEK is polyetheretherketone.

As shown in fig. 1, the packer assembly of the present embodiment further includes: a first grommet 30 and a second grommet 40. The first grommet 30 is located outside the liner 10 and at a first end of the liner 10. Second grommet 40 removably fits over the exterior of liner conduit 10 and is located at the second end of liner conduit 10. The rubber sleeve 20 is located between the first grommet 30 and the second grommet 40. The provision of the first and

second grommets

30, 40 effectively protects the rubber sleeve 20. Specifically, the first guard ring 30 and the second guard ring 40 may be made of aluminum magnesium alloy.

As shown in fig. 1, in the solution of the present embodiment, in the initial state, the height of the rubber sleeve 20 is less than or equal to the height of the first guard ring 30 or the height of the second guard ring 40, and the height of the rubber sleeve 20 after encountering liquid is higher than the height of the first guard ring 30 and the height of the second guard ring 40. Therefore, when the packer assembly is placed into a horizontal well, the rubber sleeve 20 is not easy to damage, and after the rubber sleeve 20 is placed into the horizontal well, when water or oil-water mixture is encountered, the rubber sleeve 20 expands, and the rubber sleeve 20, the liner tube 10 and the wall surface of the horizontal well are matched to form separation. The packer assembly with the structure has the advantages of low processing cost and convenience in setting.

As shown in fig. 1, in the solution of the present embodiment, the height of the first guard ring 30 is the same as the height of the second guard ring 40. The first guard ring 30 and the second guard ring 40 with the structure have lower processing cost and convenient arrangement.

As shown in fig. 1, in the solution of the present embodiment, the second grommet 40 has a first through hole, and the liner 10 has a second through hole corresponding to the first through hole. The provision of the first and second apertures makes it easier to secure the second grommet 40 to the liner 10.

As shown in fig. 1, in the technical solution of this embodiment, the packer assembly further includes a base pipe 50 and a shear pin 60, a groove is provided on an outer wall of the base pipe 50, the groove is provided corresponding to each of the first through hole and the second through hole, and the shear pin 60 can be inserted into the first through hole, the second through hole and the groove to fix the second grommet 40, the liner 10 and the base pipe 50 together. The above-described structure is convenient for removing the base pipe 50, for example, when the base pipe 50 is dragged, the shear pins 60 are sheared by the force of the base pipe 50 and the liner pipe 10, so that the base pipe 50 can be removed without damaging the rubber casing 20.

As shown in fig. 1, in the solution of the present embodiment, the shear pin 60 is made of a soluble material. Such shear pins 60 do not cause pollution to the horizontal well, and the shear pins 60 slowly decompose in the oil-water mixture. Specifically, the soluble material is a material that is easily soluble in water or oil, for example, a metal with high activity such as an aluminum magnesium alloy. It should be noted that the first grommet 30 and the liner 10 are of an integral structure or the first grommet 30 and the liner 10 are connected by screw threads. The shear pin is the front clamping pipe column.

As shown in fig. 1, in the present embodiment, the packer assembly further includes a seal 70, the seal 70 being disposed between the base tubular 50 and the liner 10. The seal 70 is provided to provide a better seal between the base pipe 50 and the liner 10.

In the solution of the present embodiment, as shown in fig. 1, the sealing element 70 is an O-ring, and the central tube 50 is provided with an annular groove, in which the O-ring is at least partially disposed. The structure has lower processing cost and convenient arrangement. Specifically, the number of the O-rings is plural, and the plural O-rings are provided at intervals in the axial direction of the center pipe 50.

As shown in fig. 1, in the technical solution of this embodiment, the packer assembly further includes a connecting pipe 80, an external thread is provided on the outer wall of the central pipe 50, and an internal thread adapted to the external thread is provided on the inner wall of the connecting pipe 80. The connection pipe 80 is provided to facilitate the connection of the center pipe 50 to an external pipe. The external screw thread sets up the tip that is close to second retaining ring 40 at the middle line pipe, and above-mentioned structure processing cost is lower, sets up the convenience.

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 the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, 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.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A deblocking fluid swellable packer assembly, comprising:

a liner (10);

the rubber sleeve (20), the rubber sleeve (20) cover is established the outside of bushing pipe (10), rubber sleeve (20) are for meeting liquid inflation rubber material.

2. The deblocking fluid swellable packer assembly of claim 1, further comprising:

a first grommet (30), the first grommet (30) being located outside the liner (10) and at a first end of the liner (10);

the second retaining ring (40) is detachably sleeved outside the liner pipe (10) and is positioned at the second end of the liner pipe (10);

the rubber sleeve (20) is located between the first grommet (30) and the second grommet (40).

3. The deblocking fluid swellable packer assembly according to claim 2, wherein in an initial state, the rubber casing (20) has a height equal to or less than a height of the first grommet (30) or a height of the second grommet (40), and the rubber casing (20) has a height after exposure to fluid that is greater than the height of the first grommet (30) and the height of the second grommet (40).

4. A deblocking fluid swellable packer assembly according to claim 2 or 3, characterized in that the height of the first grommet (30) and the height of the second grommet (40) are the same.

5. The deblocking fluid-swellable packer assembly of claim 2, wherein the second grommet (40) has a first perforation and the liner (10) has a second perforation disposed in correspondence with the first perforation.

6. The deblocking fluid-swellable packer assembly of claim 5, further comprising a base pipe (50) and a shear pin (60), wherein a groove is disposed on an outer wall of the base pipe (50), the groove being disposed in correspondence with each of the first and second perforations, the shear pin (60) being insertable within the first, second and groove to secure the second grommet (40), the liner (10) and the base pipe (50) together.

7. The deblocking fluid-swellable packer assembly of claim 6, wherein the shear pins (60) are made of a dissolvable material.

8. The deblocking fluid-swellable packer assembly of claim 6, further comprising a seal (70), the seal (70) being disposed between the base pipe (50) and the liner (10).

9. The deblocking fluid-swellable packer assembly of claim 8, wherein an annular groove is disposed on the base pipe (50), and the sealing element (70) is at least partially disposed within the annular groove.

10. The deblocking fluid-swellable packer assembly according to claim 6, further comprising a connecting pipe (80), wherein an outer thread is provided on an outer wall of the base pipe (50), and an inner thread adapted to the outer thread is provided on an inner wall of the connecting pipe (80).