CN217735444U

CN217735444U - Soluble bridge plug

Info

Publication number: CN217735444U
Application number: CN202221553218.6U
Authority: CN
Inventors: 张继; 袁吉祥
Original assignee: Qiaofeng Technology Chengdu Co ltd
Current assignee: Qiaofeng Technology Chengdu Co ltd
Priority date: 2022-06-21
Filing date: 2022-06-21
Publication date: 2022-11-04
Anticipated expiration: 2032-06-21

Abstract

A soluble bridge plug belongs to the technical field of drilling and production equipment of oil and gas reservoirs and comprises a hollow mandrel, a slip, a conical body and a rubber plug, wherein the conical body comprises a small end and a large end; the hollow mandrel and the conical body are connected in a sliding manner through the check teeth, so that the hollow mandrel and the conical body can only move towards the axial approaching direction; the rubber plug is coaxially sleeved on the outer wall of the conical section of the conical body; one end of the hollow mandrel, which is positioned at the small end, is provided with an annular boss extending outwards in the radial direction; the slips are located between the annular boss and the rubber plug. The utility model discloses only adopt a slips, a conical body, overall structure is simple, and hollow core axle and conical body realize unidirectional movement through the backstop tooth moreover, can compress tightly slips and plug after the removal and continuously provide the packing force for it, and the slips need not to design into high strength construction and provides radial chucking tubular column, the axial compresses tightly the power of plug, and consequently the slips can be done lessly, and the later stage of being convenient for is dissolved, can be in order to accelerate deblocking speed.

Description

Soluble bridge plug

Technical Field

The utility model belongs to the technical field of the oil gas is hidden bores and adopts equipment technique and specifically relates to the separation equipment of in-process is adopted to the brill, specifically is a soluble bridging plug.

Background

The layered fracturing refers to a process of dividing a well into a plurality of intervals and then performing individual fracturing on the reservoir layer of each interval, and is a common oil and gas stimulation measure. The stratum separation of the technology relates to well section separation equipment such as a packer and a bridge plug, wherein the bridge plug has the characteristics of less construction procedures, short period and accurate blocking position, and has a wide application range.

At present, the type of bridge plug has a variety, wherein soluble bridge plug has adopted dissolvable material, it cuts apart the later stage and can dissolve under the stratum condition and need not operations such as drilling and milling, therefore it is paid much attention to, its fundamental principle is as shown in figure 1, it is coaxial cover establishes slips 2 on hollow core axle 1, conical body 3, plug 4, conical body 3, slips 2, when using, utilize the setting instrument to compress tightly two slips 2 to the centre, two slips 2 promote two conical body 3 and remove compression plug 4 and make its radial expansion seal the annular cavity between tubular column 5 and the bridge plug, then continue to compress tightly two slips 2, thereby two slips 2 along the inclined plane of conical body 3 radial expansion chucking on tubular column 5 inner wall, can prevent axial expansion like this, radial contraction, the later stage drop into the setting ball shutoff hollow core axle again can, the utility model discloses an object is to optimize the above-mentioned structure, provide a soluble bridge plug of single card that the structure is comparatively simple.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing a soluble bridge plug, this soluble bridge plug adopts single slips, structure comparatively simple.

The utility model provides a technical scheme is: a soluble bridge plug comprises a hollow mandrel, slips, a cone and a rubber plug, wherein the cone comprises a small end and a large end, and the diameter of the large end is larger than that of the small end; the hollow core shaft is characterized in that the outer wall of the hollow core shaft is in sliding connection with the inner wall of the cone body through the check teeth, so that the hollow core shaft and the cone body can only move towards the axial approaching direction; the rubber plug is coaxially sleeved on the outer wall of the conical section of the conical body; one end of the hollow mandrel, which is positioned at the small end, is provided with an annular boss extending outwards in the radial direction; the slips are located between the annular boss and the rubber plug.

As a specific embodiment of the present invention, the hollow core shaft is located the one end of main end is fixed with two or more than two tooth plates that extend axially along the hollow core shaft and can be expanded radially outward to compress tightly the inner wall of the cone, the non-return tooth is located the outer wall of the tooth plate.

Further, the blade is made of an elastic material.

As a specific embodiment of the present invention, in order to prevent the rubber plug from being damaged or compressed during the process of dropping into the bridge plug, the outer diameter of the rubber plug is not greater than the outer diameter of the slip.

Further, the slips with the conical body is through shearable round pin fixed connection, certainly, also can with the conical body with hollow for the dabber shearable round pin fixed connection, its effect is similar, mainly avoid the bridge plug to remove the in-process, annular boss extrusion conical body.

As a specific embodiment of the present invention, the slips are located a part of the outside of the cone is located outside the cone and there is an annular cavity between the cone and the slips, i.e. the slips are not tightly attached to each other.

The utility model discloses the technological effect who plays is:

(1) The utility model discloses only adopt a slips, a conical body, for two slips structures, overall structure is more simple.

(2) The utility model discloses a well cavity dabber and conical body realize single direction movement through the backstop, can compress tightly slips and plug after the removal and continuously provide the packing force for it, and the slips need not to design into high strength construction and provides radial chucking tubular column, the axial and compress tightly the power of plug, therefore the slips can be done lessly, and the later stage of being convenient for is dissolved, can be in order to accelerate deblocking speed.

Drawings

In order to more clearly illustrate the technical solution of the embodiments of the present invention, the drawings which are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and that for those skilled in the art, other related drawings can be obtained according to these drawings without inventive efforts.

FIG. 1 is a schematic diagram of a prior art dual slip dissolvable bridge plug;

FIG. 2 is a partial cross-sectional view of the present soluble bridge plug;

FIG. 3 is a half sectional view of the cone;

fig. 4 is a perspective view of the hollow mandrel.

Detailed Description

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

To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined to clearly and completely describe the technical solutions of the embodiments of the present invention, and obviously, the described embodiments are 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 work belong to the protection scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention.

Examples

Referring to FIGS. 2-4, FIG. 2 is a partial cross-sectional view of the present dissolvable bridge plug, and FIG. 3 is a half cross-sectional view of the cone; fig. 4 is a perspective view of the hollow mandrel. The soluble bridge plug of this embodiment comprises a hollow mandrel 1, slips 2, cone 3 and plug 4.

The conical body 3 is a hollow structure and comprises a small end 31 and a large end 32, wherein the diameter of the large end 32 is larger than that of the small end 31, and the large end 32 is provided with a ball seat 33.

The hollow mandrel 1 is also of a hollow structure, one end of the hollow mandrel 1 is provided with an annular boss 11 extending outwards in the radial direction, the other end of the hollow mandrel 1 is fixed with six tooth sheets 12 extending axially along the hollow mandrel 1 and capable of expanding outwards in the radial direction, and the outer walls of the tooth sheets 12 are provided with non-return teeth 121.

The hollow mandrel 1 is provided with one end with the non-return teeth 121 and is inserted into the hollow part of the conical body 3 from the small end 32 of the conical body 3, the non-return teeth 121 are also arranged on the inner wall of the hollow part of the conical body 3, the tooth plate 12 is made of elastic materials such as spring steel, so that the outer wall of the tooth plate 12 compresses the inner wall of the hollow part of the conical body 3, the non-return teeth 121 of the two are mutually meshed to form a non-return structure, and the conical body 3 and the hollow mandrel 1 can only move in a one-way direction along the axial direction and cannot move in a reverse direction.

The rubber plug 4 is coaxially sleeved on the inclined plane of the conical section of the conical body 3, the slip 2 is also coaxially sleeved on the outer wall of the residual hollow mandrel 1, one end of the slip compresses the annular boss 11, and the other end of the slip compresses the rubber plug 4. A part of the slips is sleeved outside the cone 3, but the wall surfaces of the slips are not in pressing contact, so that an annular cavity 7 exists between the cone 3 and the slips 2.

When the hollow mandrel 1 is pushed axially to move axially along the conical body 3, the annular boss 11 pushes the slip 2 to move, the slip 2 pushes the rubber plug 4 to move, the rubber plug 4 radially expands to separate a gap between the pipe column and the outer wall of the bridge plug, and the hollow mandrel 1 is further pushed, so that the slip 2 is contacted with the conical inclined surface of the conical body 3 and continuously slides to radially expand to press the inner wall of the pipe, and the whole body is fixed in the pipe column.

In addition, in order to prevent the bridge plug from being separated in advance due to misoperation before reaching the target well section position, the outer diameter of the rubber plug 4 is not larger than that of the slip 2, the slip 2 is fixedly connected with the conical body 3 through the shearable pin 6, and the rubber plug 4 can be compressed only after the hollow mandrel 1 moves to cut off the shearable pin 6 in the pushing process of the setting tool in the later period.

In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and should not be construed as limiting the present invention.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the embodiments of the present invention are all covered by the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A soluble bridge plug comprises a hollow mandrel, slips, a cone and a rubber plug, wherein the cone comprises a small end and a large end, and the diameter of the large end is larger than that of the small end; the conical body is coaxially sleeved on the outer wall of the hollow mandrel, at least one part of the slip is coaxially sleeved on the outer wall of the conical body,

the outer wall of the hollow mandrel is in sliding connection with the inner wall of the conical body through the non-return teeth, so that the hollow mandrel and the conical body can only move towards the axial approaching direction;

the rubber plug is coaxially sleeved on the outer wall of the conical section of the conical body;

one end of the hollow mandrel, which is positioned at the small end, is provided with an annular boss extending outwards in the radial direction; the slips are located between the annular boss and the rubber plug.

2. A soluble bridge plug according to claim 1, wherein: and two or more than two tooth sheets which axially extend along the hollow mandrel and can radially and outwards expand to press the inner wall of the conical body are fixed at one end of the hollow mandrel, which is positioned at the large end, and the non-return teeth are positioned on the outer wall of the tooth sheets.

3. A soluble bridge plug according to claim 2, wherein: the tooth blade is made of elastic material.

4. A soluble bridge plug according to claim 1, wherein: the outer diameter of the rubber plug is not larger than that of the slips.

5. A soluble bridge plug according to claim 1, wherein: the slips and the conical body are fixedly connected through a shearable pin.

6. A soluble bridge plug according to claim 1, wherein: the cone is fixedly connected with the hollow mandrel through a shearable pin.

7. A soluble bridge plug according to any one of claims 1 to 6, wherein: and a part of the slip, which is positioned on the outer wall of the conical body, is positioned on the outer side of the conical body, and an annular cavity is formed between the conical body and the slip.