CN210068065U - Segmented well completion packer - Google Patents

Abstract

The utility model provides a segmented well completion packer, which comprises an upper joint component, a lower joint component and a plugging component connected between the upper joint component and the lower joint component, wherein the plugging component comprises a central tube and a corrugated tube capable of protruding in the radial direction, and the corrugated tube is sleeved on the outer side of the central tube to form an annular space for injecting cement slurry; and the upper joint assembly or the lower joint assembly is provided with an injection assembly for injecting cement slurry into the annular space. The utility model has the advantages of can effectively seal pressure-bearing in high temperature high pressure environment.

Description

Segmented well completion packer

Technical Field

The utility model relates to an oil well completion field especially relates to a segmentation well completion packer.

Background

The oil and gas production process usually needs segmented steam injection and segmented production, and the existing mode usually uses a casing packer to seal an annular space between a casing and an oil pipe, and then carries out fracturing and yield increasing operation. After the packer is lowered into a preset well depth through a feeding pipe column, the rubber sleeve is expanded and deformed in a hydraulic pressure mode, a mechanical force mode and the like, and therefore the oil sleeve annulus is sealed.

However, at present, as oil and gas production drills towards deeper strata, complex conditions such as underground high temperature, high pressure, high sulfur content and the like are more and more, and the conventional casing packer cannot meet the well completion requirements, and the conventional casing packer is mainly characterized in that: 1) the pressure of the packer is insufficient; 2) the conventional packer is seriously influenced by temperature and has low temperature resistance; 3) the shoulder of a traditional compression-type rubber cylinder is easy to tear when compressed. Therefore, the existing casing packer is easy to lose sealing effect under the high-temperature and high-pressure environment, cannot meet the use requirement and is difficult to complete the well.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to overcome prior art not enough, provide a segmentation well completion packer that can effectively seal the pressure-bearing in high temperature high pressure environment.

In order to solve the technical problem, the utility model provides a technical scheme does:

a segmented well completion packer comprises an upper joint component, a lower joint component and a plugging component connected between the upper joint component and the lower joint component, wherein the plugging component comprises a central pipe and a corrugated pipe capable of radially protruding, and the corrugated pipe is sleeved on the outer side of the central pipe to form an annular space for injecting cement slurry; and the upper joint assembly or the lower joint assembly is provided with an injection assembly for injecting cement slurry into the annular space.

As a further improvement of the above technical solution:

the injection assembly comprises an injection channel and a check valve, one end of the injection channel extends to the outer side of the upper joint assembly or the lower joint assembly, the other end of the injection channel is communicated with the annular space, and the check valve is arranged on the injection channel.

The injection channel comprises a horizontal section and a vertical section which are communicated with each other, the horizontal section is communicated with the annular space, and the check valve is arranged on the vertical section.

And two ends of the corrugated pipe are respectively installed on the upper joint component and the lower joint component through a connecting installation sleeve.

The connecting and mounting sleeve is an annular mounting sleeve, annular grooves are formed in the upper joint assembly and the lower joint assembly, and the annular mounting sleeve is fixedly mounted in the annular grooves.

And two ends of the central pipe are respectively in threaded connection with the upper joint assembly and the lower joint assembly.

The upper joint component comprises an upper joint, a lifting short section and a coupling which are sequentially connected, and the upper joint is connected with the corrugated pipe and the central pipe.

The lower joint component comprises a lower joint and a connecting joint which are connected with each other, and the connecting joint is connected with the corrugated pipe and the central pipe.

The injection assembly is arranged on the upper joint or the connecting joint.

Compared with the prior art, the utility model has the advantages of:

the utility model discloses a shutoff subassembly includes center tube and bellows, and the bellows encloses with the center tube and closes the annular space that forms injected cement thick liquid, and is equipped with the injection subassembly on top connection subassembly or the lower clutch subassembly to inject into cement thick liquid to annular space. When cement slurry is injected into an annular space, the corrugated pipe expands outwards to extrude the well wall so as to seal the annular space between the well wall and the packer and form a closed layer section, so that the problems of poor temperature resistance, easy tearing and the like caused by the adoption of a compression type rubber sleeve are avoided, and the sealing effect of the packer is ensured; simultaneously, the annular space length that the center tube and bellows enclose to close and form compares the compression packing element and increases by a wide margin to make the same increase by a wide margin of closed interval section length, the pressure-bearing performance of packer is excellent. Namely the utility model discloses can realize permanent seal, guarantee the effective sealed pressure-bearing of packer in high temperature high pressure environment simultaneously, satisfy the well completion operation requirement.

Drawings

The present invention will be described in more detail hereinafter based on embodiments and with reference to the accompanying drawings. Wherein:

figure 1 is the structure schematic diagram of the segmented completion packer of the utility model.

The reference numerals in the figures denote:

1. an upper joint assembly; 11. an upper joint; 12. lifting the short section; 13. a coupling; 2. a lower adapter assembly; 21. a lower joint; 22. connecting a joint; 3. a plugging component; 31. a central tube; 32. a bellows; 33. an annular space; 4. an injection assembly; 41. an injection channel; 42. a check valve; 5. and connecting the mounting sleeve.

Detailed Description

The invention will be described in further detail with reference to the drawings and specific examples, but the scope of the invention is not limited thereto.

Fig. 1 shows an embodiment of the segmented completion packer of the present invention, which is effective for segmented completion of a desired segmented formation, mainly for high temperature wells and for segmented completion requiring a permanently cased well. In this embodiment, the segmented completion packer comprises an upper joint assembly 1, a lower joint assembly 2 and a plugging assembly 3, wherein the plugging assembly 3 is connected between the upper joint assembly 1 and the lower joint assembly 2. The plugging component 3 comprises a central pipe 31 and a corrugated pipe 32, wherein the corrugated pipe 32 is sleeved outside the central pipe 31 to form an annular space 33 for injecting cement slurry; the lower joint assembly 2 is provided with an injection assembly 4 for injecting cement slurry into the annular space 33, the bellows 32 being radially expandable during injection of cement slurry. In other embodiments, the injection assembly 4 may also be provided on the upper joint assembly 1.

The corrugated pipe 32 of the utility model expands outwards to extrude the wall of a well when cement paste is injected into the annular space 33, so as to achieve the purpose of sealing the annular space between the wall of a well and the packer, and form a closed layer section, thereby avoiding the problems of poor temperature resistance, easy tearing and the like when a compression type packing element is adopted, and ensuring the sealing effect of the packer; meanwhile, the length of an annular space 33 formed by enclosing the central tube 31 and the corrugated tube 32 is greatly increased compared with that of a compression rubber sleeve, and the length of the corrugated tube 32 can reach more than 70-80 cm generally, so that the length of a closed layer section is also greatly increased, and the pressure-bearing performance of the packer is excellent. Namely the utility model discloses can realize permanent seal, guarantee the effective sealed pressure-bearing of packer in high temperature high pressure environment simultaneously, satisfy the well completion operation requirement.

Further, the injection assembly 4 comprises an injection channel 41 and a check valve 42. One end of the injection channel 41 extends to the outer side of the lower joint assembly 2, and the other end of the injection channel 41 is communicated with the annular space 33, so that cement can be conveniently and effectively squeezed into the annular space 33 by a cement injection pipe column through the injection channel 41; a check valve 42 is provided on the injection passage 41 to prevent backflow of the cement slurry injected into the annular space 33. In other embodiments, when the injection member 4 is mounted on the upper joint member 1, one end of the injection passage 41 extends to the outside of the upper joint member 1.

Further, the injection passage 41 includes a horizontal section communicating with the annular space 33 and a vertical section extending to the outside of the lower joint assembly 2, and the check valve 42 is provided on the vertical section. The injection channel 41 is compact in layout, and effective injection of cement slurry is facilitated.

As shown in fig. 1, both ends of the bellows 32 are respectively mounted to the upper joint assembly 1 and the lower joint assembly 2 through a coupling mounting sleeve 5. In this embodiment, the connection mounting sleeve 5 is an annular mounting sleeve, the upper joint assembly 1 and the lower joint assembly 2 are both provided with annular grooves, the annular mounting sleeve is welded and mounted in the annular grooves, and the corrugated pipe 32 is welded and fixed with the connection mounting sleeve 5. The connecting strength of the corrugated pipe 32 is guaranteed, and the corrugated pipe is convenient to install and simple in structure.

In this embodiment, two ends of the central tube 31 are respectively connected with the upper joint component 1 and the lower joint component 2 by screw threads. The top connection assembly 1 comprises a top connection 11, a lifting nipple 12 and a coupling 13 which are connected in sequence, wherein the corrugated pipe 32 is connected with the top connection 11 in a welding mode, and the central pipe 31 is connected with the top connection 11 in a threaded mode. The lower joint assembly 2 comprises a lower joint 21 and a connecting joint 22 which are connected with each other, wherein the corrugated pipe 32 is connected with the connecting joint 22 in a welding mode, the central pipe 31 is connected with the connecting joint 22 in a threaded mode, and the injection assembly 4 is arranged on the connecting joint 22. In other embodiments, the injection assembly 4 may also be provided on the upper joint 11.

While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. The present invention is not limited to the particular embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims (9)

1. A segmented well completion packer comprises an upper joint component, a lower joint component and a plugging component connected between the upper joint component and the lower joint component, and is characterized in that the plugging component comprises a central tube and a corrugated tube capable of protruding in the radial direction, and the corrugated tube is sleeved on the outer side of the central tube to form an annular space for injecting cement slurry; and the upper joint assembly or the lower joint assembly is provided with an injection assembly for injecting cement slurry into the annular space.

2. The segmented completion packer of claim 1, wherein the injection assembly comprises an injection passage and a check valve, wherein one end of the injection passage extends outside of the upper or lower sub assembly, the other end of the injection passage communicates with the annular space, and the check valve is disposed on the injection passage.

3. The segmented completion packer of claim 2, wherein the injection passage comprises a horizontal segment and a vertical segment in communication with each other, the horizontal segment being in communication with the annular space, the check valve being disposed on the vertical segment.

4. The segmented completion packer of any one of claims 1 to 3, wherein both ends of the bellows are mounted to the upper and lower sub assemblies by a coupling mounting sleeve, respectively.

5. The segmented completion packer of claim 4, wherein the connection mounting sleeve is an annular mounting sleeve, and annular grooves are formed in the upper joint assembly and the lower joint assembly, and the annular mounting sleeve is fixedly mounted in the annular grooves.

6. The segmented completion packer of any one of claims 1 to 3, wherein both ends of the base pipe are threadedly connected to the upper and lower sub assemblies, respectively.

7. The segmented completion packer of claim 6, wherein the upper sub assembly comprises an upper sub, a riser sub and a collar connected in series, the upper sub being connected to the bellows and the base pipe.

8. The segmented completion packer of claim 7, wherein the lower sub assembly comprises an interconnecting lower sub and a connection sub, the connection sub being connected to the bellows and base pipe.

9. The segmented completion packer of claim 8, wherein the injection assembly is disposed on the upper sub or connection sub.

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