CN218669303U

CN218669303U - Small-size soluble/drillable bridge plug matched with large casing internal diameter casing variable well

Info

Publication number: CN218669303U
Application number: CN202222720796.0U
Authority: CN
Inventors: 赵燕青; 刘星; 韦琦
Original assignee: Chongqing Shuangbiao Petroleum Engineering Technology Service Co ltd
Current assignee: Chongqing Shuangbiao Petroleum Engineering Technology Service Co ltd
Priority date: 2022-10-17
Filing date: 2022-10-17
Publication date: 2023-03-21
Anticipated expiration: 2032-10-17

Abstract

The utility model discloses a big sleeve pipe internal diameter cover becomes supporting soluble/drillable bridging plug of small-size of well, including the center tube, the cover of center tube upper portion is equipped with the push-up ring, the cover of center tube lower part is equipped with slips and guide shoe down, it has last cylinder protection ring, packing element, the packing element protection ring under floating, the packing element shoulder ring that floats, unsteady metal support ring and lower cone to overlap from last to down between the slip under and on the center tube, the equipartition is no less than 4 rows of anchoring tooth pieces on the slip down, slip length is set to 35-55mm down, equipartition is one row of alloy granule anchoring tooth piece on the cone down; the utility model discloses a single slips structure, through the length of slips under the extension and increase the briquetting on the slips down, increase slips inflation stroke, can increase packing element inflation stroke, make the sealed expansion rate of packing element can increase 15% -45%, enlarge the sealed diameter of packing element to make the diameter be 88mm or 83 mm's soluble/drillable bridging plug can satisfy the biggest latus rectum and use for 118.6mm sleeve pipe.

Description

Small-size soluble/drillable bridge plug matched with large casing internal diameter casing variable well

Technical Field

The utility model belongs to the technical field of a cementing method or device for shutoff well, crack or similar condition, specifically relate to a supporting small-size soluble/drillable bridge plug of big sleeve pipe internal diameter casing transform well.

Background

Currently, soluble/drillable bridge plugs have been widely used for formation packing during oil and gas well operations; the soluble/drillable bridge plug is adopted to carry out stratum packing, so that staged fracturing can be effectively realized, stratum stress is greatly changed along with vigorous development of an oil-gas well, or the deformation probability of a casing of the oil-gas well is sharply increased due to geological factors, the soluble/drillable bridge plug of the original specification and model which is conventionally matched after the casing is produced can not meet the casing packing requirement of a casing variation well, for example, the soluble bridge plug of a thick-wall casing with the outer diameter of 139.7mm and the through diameter of 118.6mm/114.3mm is usually adopted, the soluble/drillable bridge plug of 106mm-95mm is adopted, after the casing is expanded and attached, the inner diameter of the casing is reduced to be less than 95mm, the position where the soluble/drillable bridge plug with the outer diameter of 106mm-95mm is normally used is difficult to deform the casing, and the packing position is the small-size casing with the normal-size inner diameter, so that the soluble/drillable bridge plug is selected to meet the working requirement.

Disclosure of Invention

In view of this, an object of the present invention is to provide a large sleeve internal diameter matching small-size soluble/drillable bridge plug, which adopts a single slip structure, and increases the slip expansion stroke by extending the length of the lower slip and increasing the block on the lower slip, so as to enable the lower slip to expand and clamp in the large sleeve, and at the same time, utilize the floating metal support ring, the floating lower rubber sleeve protection ring and the floating rubber sleeve shoulder ring, so as to increase the rubber sleeve expansion stroke, so that the rubber sleeve sealing expansion rate can be increased by 15% -45%, and the rubber sleeve sealing diameter can be enlarged, thereby enabling the soluble/drillable bridge plug with a diameter of 88mm or 83mm to satisfy the use of the maximum through diameter of 118.6mm sleeve.

In order to achieve the purpose, the utility model relates to a supporting small-size soluble/drillable bridge plug of big sleeve pipe internal diameter, including the center tube, center tube upper portion cover is equipped with push ring, center tube lower part cover is equipped with slips and guide shoe down lie in on the center tube and push ring and down between the slips from last to the cover be equipped with down go up cartridge protection ring, packing element, float down packing element protection ring, float packing element shoulder ring, metal support ring and lower cone float, the equipartition has to be no less than 4 rows of fixture blocks on the slips down, slips length sets up to 35-55mm down.

Furthermore, a row of alloy particle tooth blocks used for anchoring and limiting the lower slip are uniformly distributed on the lower cone close to the middle part of the conical surface.

Furthermore, a conical surface used for supporting the floating metal support ring during setting is arranged on the side wall, close to the floating metal support ring, of the lower cone.

Furthermore, a sleeve sleeved on the central tube extends from the side wall of the lower cone close to the floating metal support ring, and a sawtooth groove for fixing the floating metal support ring is formed in the sleeve.

Further, a compression gap is arranged between the floating metal support ring and the side wall of the lower cone.

The beneficial effects of the utility model reside in that:

the utility model discloses the supporting small-size soluble/drillable bridge plug of big sleeve pipe internal diameter adopts single slips structure, through the length of slips under the extension and the fixture block on the slip under the increase, increase slips expansion stroke, slip can expand the joint in big sleeve pipe under making the soluble/drillable bridge plug of small-size, utilize unsteady metal-support ring simultaneously, the packing element protection ring and the packing element shoulder ring that floats under floating, can increase packing element expansion stroke, it is 15% -45% to make the sealed expansion ratio of packing element can increase, enlarge packing element sealing diameter, thereby make the diameter can satisfy the biggest latus rectum for the use of 118.6mm sleeve pipe for 88mm or 83 mm's bridge plug.

Drawings

FIG. 1 is a schematic structural view of the small-sized soluble/drillable bridge plug of the large casing internal diameter of the present invention;

fig. 2 is a schematic structural diagram of another embodiment of the present invention, which is a large casing pipe inner diameter matched with a small-sized soluble/drillable bridge plug.

Reference numerals: 1-guide shoe; 2, pulling slips down; 3-lower cone; 4-floating metal support ring; 5-a rubber cylinder; 6-push up the ring; 7-a central tube; 8-floating lower rubber cylinder protection ring; 9, gluing a cylinder protection ring; 10-floating rubber cylinder shoulder ring; 11-compression gap: 12-a fixture block; 13-alloy particle dental block.

Detailed Description

The following detailed description of the preferred embodiments of the present invention will be made with reference to the accompanying drawings.

As shown in fig. 1-2 the utility model discloses the supporting soluble/drillable bridge plug of small-size of big sleeve pipe internal diameter structural schematic diagram, the utility model relates to a supporting soluble/drillable bridge plug of small-size of big sleeve pipe internal diameter, including

center tube

7, 7 upper portion covers of center tube are equipped with

push ring

6, 7 lower part covers of center tube are equipped with slips 2 and guide 1 down lie in on the center tube 7 between push ring 6 and the slips 2 down from last to the cover be equipped with last cylinder protection ring 9, packing element 5, float down packing element protection ring 8, float packing element shoulder ring 10, float metal support ring 4 and cone 3 down, the equipartition has to be no less than 4 rows of fixture blocks on the slips 2 down, 2 length sets up to 35-55mm down.

This embodiment is through adopting single slips structure, through the length of extension slips down and increase the fixture block on the slips down, increase slips expansion stroke, make the slip can expand the joint in big sleeve under the soluble/drillable bridge plug of small-size, utilize simultaneously unsteady metal-support ring, unsteady rubber cylinder protection ring down and unsteady rubber cylinder shoulder ring, can increase the rubber cylinder expansion stroke, make the sealed expansion rate of rubber cylinder can increase and be 15% -45%, enlarge the sealed diameter of rubber cylinder, thereby make the diameter be 88mm or 83 mm's bridge plug can satisfy the use of the sleeve pipe of biggest latus rectum 118.6 mm.

The preferred embodiment, it has one row to be used for carrying out the spacing alloy granule dental block 13 of anchoring to slips 2 down to be close to conical surface middle part equipartition on the lower cone 3, and this structure of this embodiment is favorable to carrying out anchoring fixed to slips 2 inflation position down, moves to slips 2 direction down through lower cone 3, makes slips 2 expand down, and the inflation is to alloy granule dental block 13 position department, makes slips 2 joint down in big sleeve pipe.

In a preferred embodiment, the side wall of the lower cone 3 close to the floating metal support ring 4 is provided with a tapered surface for supporting the floating metal support ring in setting, and this embodiment is favorable for extruding the floating metal support ring 4, so that the floating metal support ring 4 can act on the floating rubber sleeve shoulder ring 10 and the rubber sleeve 5, and the rubber sleeve 5 has good sealing performance after being extruded and expanded.

In a preferable embodiment, the lower cone 3 extends to form a sleeve sleeved on the central tube near the side wall of the floating metal support ring, and the sleeve is provided with a sawtooth groove for fixing the floating metal support ring, the structure of the embodiment is favorable for installing and positioning the upper rubber sleeve protection ring 9, the rubber sleeve 5 and the floating lower rubber sleeve protection ring 8, in the working process of the bridge plug, the rubber sleeve 5 and the lower cone 3 slide downwards along the central tube 7 by pressurizing the upper rubber sleeve protection ring 9 and the rubber sleeve 5, the rubber sleeve 5 is simultaneously extruded, the lower cone 3 starts to extrude the lower slip 2, the lower slip 2 is clamped in the large sleeve, after the lower slip 2 is clamped and fixed in place, the upper rubber sleeve protection ring 9 and the rubber sleeve 5 continuously move downwards, the rubber sleeve 5 is further extruded, the expansion stroke of the rubber sleeve is increased, the limit teeth in the floating metal support ring 4 are withdrawn from the sawtooth groove, the floating metal support ring 4 expands under the action of the conical surface of the lower cone 3, the top edge of the expanded rubber sleeve 5 is supported, and the sealing performance of the rubber sleeve is improved.

In the preferred embodiment, a compression gap 11 is arranged between the floating metal support ring and the side wall of the lower cone, and the structure of the embodiment is beneficial to increasing the expansion stroke of the rubber cylinder.

Finally, it is noted that the above-mentioned preferred embodiments illustrate rather than limit the invention, and that, although the invention has been described in detail with reference to the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the scope of the invention as defined by the appended claims.

Claims

1. The utility model provides a supporting small-size soluble/drillable bridge plug of big sleeve pipe internal diameter casing change well, includes the center tube, center tube upper portion cover is equipped with and pushes up the ring, center tube lower part cover is equipped with slips and guide shoe down, its characterized in that: an upper rubber cylinder protection ring, a rubber cylinder, a floating lower rubber cylinder protection ring, a floating rubber cylinder shoulder ring, a floating metal support ring and a lower cone are sleeved between an upper push ring and a lower slip on the central tube from top to bottom, at least 4 rows of clamping blocks are uniformly distributed on the lower slip, and the length of the lower slip is set to be 35-55mm.

2. The large casing internal diameter casing variable well matched small size dissolvable/drillable bridge plug of claim 1, wherein: and a row of alloy particle tooth blocks for anchoring and limiting the lower slip are uniformly distributed on the lower cone close to the middle part of the conical surface.

3. The large casing internal diameter casing variable well matched small size soluble/drillable bridge plug of claim 1 or 2, wherein: and a conical surface for supporting the floating metal support ring during setting is arranged on the side wall, close to the floating metal support ring, of the lower cone.

4. The large casing internal diameter casing variable well matched small size dissolvable/drillable bridge plug of claim 3, wherein: the lower cone is provided with a sleeve sleeved on the central tube in an extending way close to the side wall of the floating metal support ring, and the sleeve is provided with a sawtooth groove for fixing the floating metal support ring.

5. The large casing internal diameter casing variable well matched small size dissolvable/drillable bridge plug of claim 4, wherein: and a compression gap is arranged between the floating metal support ring and the side wall of the lower cone.