CN211287616U

CN211287616U - Bridge plug

Info

Publication number: CN211287616U
Application number: CN201921730394.0U
Authority: CN
Inventors: 国际
Original assignee: Dongying Huachen Petroleum Equipment Co ltd
Current assignee: Dongying Huachen Petroleum Equipment Co ltd
Priority date: 2019-10-15
Filing date: 2019-10-15
Publication date: 2020-08-18
Anticipated expiration: 2029-10-15

Abstract

The utility model provides a bridge plug. Relates to the technical field of oilfield water injection downhole tools. The lower end of the central tube is in threaded connection with an anti-collision ring, a push ring is arranged below the step at the upper part of the central tube, and slips, a cone and a protective bowl are sequentially sleeved between the push ring and the anti-collision ring in a symmetrical manner by taking the rubber cylinder as the center; be equipped with a plurality of springs between centrum and the bowl that protects, it has one-way sawtooth groove to open on the centrum, and the center is equipped with one-way sawtooth, is equipped with the thrust ring in the ring channel of center tube, and the slips is overall structure, and it has to be no less than six axial bar grooves to open on the face of the cylinder outside the slips. The utility model discloses a set up whole slips, thrust collar, prevent that the bridging from receiving the impact deformation and taking place to sit in advance at the in-process of going into the well and seal the phenomenon, sit and seal the position more accurate, set up one-way sawtooth and one-way sawtooth groove, guaranteed that the compression of packing element is reliable, set up the deformation wriggling that the spring can take the initiative the elastic compensation packing element, make the packing element resume best encapsulated situation, the utility model discloses used primary material all can dissolve, removes the drilling link from, and it is old and useless to reduce the operation.

Description

Bridge plug

The technical field is as follows:

the utility model belongs to the technical field of the oil field instrument in the pit and specifically relates to a bridging plug.

Background art:

in recent years, along with the rapid development of the economy of China and the continuous attenuation of oil and gas field development and non-renewable resources, the position and the meaning of the method for exploiting unconventional oil and gas are known by more and more attention of people. The unconventional oil and gas resources in China are quite rich, the exploration potential is quite huge, but because the reservoir has the characteristics of extremely low permeability, low porosity, obvious compactness and the like, the multi-layer fracturing technology needs to be improved in order to improve the single-well yield, particularly the staged fracturing technology of the horizontal well, and the bridge plug is an extremely important underground layered plugging tool for staged fracturing of the horizontal well.

At present, soluble bridge plug adopts novel magnalium alloy material as a neotype shale gas fracturing and reforms transform instrument with layering segmentation, and conventional shale gas exploitation mainly prevents to set in advance through the design of shear pin on the centrum, because on-the-spot technology restriction, appears a large amount of sleeve pipe deformation circumstances in the work progress, leads to soluble bridge plug to be extremely easily existing in the in-process under and meets and block, set in advance and seal abnormal phenomena such as, leads to construction cycle extension, risk such as operating cost increase.

The utility model has the following contents:

in order to solve the problem, the utility model provides a bridge plug.

The technical scheme of the utility model is that: a bridge plug comprises a central tube, wherein the lower end of the central tube is in threaded connection with an anti-collision ring, a push ring is arranged below the step at the upper part of the central tube, and a slip, a cone and a protective bowl are sequentially sleeved between the push ring and the anti-collision ring in a symmetrical manner by taking a rubber cylinder as a center;

wherein, a plurality of springs are arranged between the cone body and the protective bowl along the circumferential direction and are arranged in holes formed on the circumference of the end surface of the protective bowl;

the size of the unidirectional sawtooth and the unidirectional sawtooth groove are in clearance fit connection, and the unidirectional sawtooth groove are in a so-called unidirectional direction and point to the center of the rubber cylinder as a direction;

the size of the inner hole of the protective bowl is larger than the maximum outer diameters of the unidirectional sawteeth and the unidirectional sawtooth grooves;

the protective bowl is in contact with the ring surface of the rubber cylinder, an annular groove is formed in the central pipe, a thrust ring is arranged in the annular groove, and the outer diameter of the thrust ring is larger than the inner diameter of the protective bowl;

the slips be an overall structure, it has six axial bar grooves to open on the slip outer cylinder face to be no less than, this bar groove divide into the independent slips of being no less than six interconnect with overall structure's slips.

And when the spring is installed, the spring is in a maximum compression state.

The slips are characterized in that a plurality of ceramic cylindrical teeth are embedded outside the slips.

The middle part of the inner hole of the rubber cylinder is provided with a V-shaped ring groove.

The outer diameters of the push ring, the rubber cylinder, the ceramic cylindrical teeth, the cone, the protective bowl and the anti-collision ring are the same as the outer diameter of the push ring.

The rubber cylinder is soluble rubber, and the rest elements are soluble materials of magnesium-aluminum alloy.

The utility model discloses following beneficial effect has: the utility model discloses a set up whole slips, thrust collar, prevent that the bridging from receiving the impact deformation and taking place to sit in advance at the in-process of going into the well and seal the phenomenon, sit and seal the position more accurate, set up one-way sawtooth and one-way sawtooth groove, guaranteed that the compression of packing element is reliable, set up the deformation wriggling that the spring can take the initiative the elastic compensation packing element, make the packing element resume best encapsulated situation, the utility model discloses used primary material all can dissolve, removes the drilling link from, and it is old and useless to reduce the operation.

Description of the drawings:

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

FIG. 2 is a cross-sectional view of the slip of FIG. 1.

In the figure, 1-a central tube, 2-a push ring, 3-a slip, 4-a ceramic cylindrical tooth, 5-a cone, 6-a spring, 7-a protective bowl, 8-a rubber cylinder, 9-a thrust ring, 10-a one-way sawtooth, 11-a one-way sawtooth groove, 12-an anti-collision ring and 13-a strip-shaped groove.

The specific implementation mode is as follows:

the present invention will be further explained with reference to the accompanying drawings:

as shown in fig. 1 and fig. 2, the bridge plug comprises a central tube 1, wherein the lower end of the central tube 1 is in threaded connection with an anti-collision ring 12, a push ring 2 is arranged below the step at the upper part of the central tube 1, and a slip 3, a cone 5 and a protective bowl 7 are sequentially sleeved between the push ring 2 and the anti-collision ring 12 in a symmetrical manner by taking a rubber cylinder 8 as a center;

wherein, between the cone 5 and the bowl 7, a plurality of springs 6 are arranged in the holes formed on the circumference of the end surface of the bowl 7 along the circumferential direction, and the springs 6 are arranged between the cone 5 and the bowl 7, so that after the rubber cylinder is compressed, the thrust generated by the compression of the springs still exists on the two sides of the rubber cylinder, and when the two sides of the rubber cylinder are subjected to local deformation and creep when being impacted by pressure, the thrust generated by the springs can actively and elastically compensate the deformation and creep of the rubber cylinder, so that the rubber cylinder can recover the optimal sealing state;

an inner hole of the cone 5 is provided with a one-way sawtooth groove 11, at least three one-way sawtooth grooves 11 are arranged on one side of the cone 5 close to the rubber cylinder 8, one-way sawteeth 10 are correspondingly arranged on the central tube 1, the one-way sawteeth 10 on the central tube 1 extend to the rubber cylinder 8, the size of the one-way sawteeth 10 and the one-way sawtooth grooves 11 is in clearance fit connection, the one-way sawteeth are in a one-way shape, the one-way sawteeth 11 and the one-way sawteeth 10 are all in a direction of the center of the rubber cylinder 8, the cone 5 can only move towards the center of the rubber cylinder 8, the cone 5 is prevented from moving reversely under the reaction force of the rubber cylinder 8;

the inner hole of the protective bowl 7 is larger than the maximum outer diameters of the unidirectional sawteeth 10 and the unidirectional sawtooth grooves 11, and the unidirectional sawteeth 10 on the central pipe 1 are accommodated;

the protective bowl 7 is in contact with the ring surface of the rubber cylinder 8, an annular groove is formed in the central tube 1, a thrust ring 9 is arranged in the annular groove, the outer diameter of the thrust ring 9 is larger than the inner diameter of the protective bowl 7, the thrust ring 9 prevents the protective bowl 7 and the cone 5 from moving towards the rubber cylinder 8, and the protective bowl 7 and the cone 5 can not move towards the rubber cylinder 8 unless the thrust ring 9 is broken when the design pressure is exceeded;

slips 3 be an overall structure, it has six axial bar grooves 13 to be no less than to open on 3 outer cylindrical surfaces of slips, this bar groove 13 divide into overall structure's slips 3 and is no less than six independent slips of interconnect, overall structure's slips is only when the slips is receiving push ring and anticollision ring promotion, the connecting band fracture of connecting independent slips just can rise under the conical surface effect of centrum, because the connection design of slips has certain intensity, can bear the deformation of bridging plug well descending in-process, impact, prevent to produce and sit in advance and seal.

When the spring 6 is installed, the spring 6 is in a maximum compression state so as to keep the two sides of the rubber cylinder to bear the maximum thrust.

Slips 3, it has a plurality of pottery cylinder teeth 4 that inlay outside slips 3 can be better to bite the wall of a well, improves and hangs the effect.

The middle part of the inner hole of the rubber cylinder 8 is provided with a V-shaped ring groove which can buffer the compression force of the rubber cylinder, and the rubber cylinder is easy to deform.

The outer diameters of the push ring 2, the rubber cylinder 8, the ceramic cylindrical teeth 6, the cone 5, the protective bowl 7 and the anti-collision ring 12 are the same as the outer diameter of the push ring 2, and the outer circles with the same diameter are beneficial to smooth descending of the bridge plug.

The rubber cylinder 8 is soluble rubber, other elements are soluble materials made of magnesium-aluminum alloy, after the setting is completed, the stratum above the bridge plug can be fractured, slips on the bridge plug are dissolved after a period of time, supporting force cannot be provided enough, the bridge plug becomes loose, the bridge plug begins to enter a dissolving link, then metal of the whole bridge plug can be completely dissolved, the middle rubber barrel is dissolved, and finally the whole soluble bridge plug only has insoluble ceramic particles.

The setting tool pushes the push ring and the anti-collision ring, the upper slips and the lower slips push the upper and lower cones and the retaining bowl, the end face of the retaining bowl shears the thrust ring, when the thrust reaches a designed value, the thrust ring is broken by the shearing force, the upper slips and the lower slips push the upper and lower cones and the retaining bowl to approach the rubber cylinder, the rubber cylinder deforms to perform setting, the setting tool continues to push the push ring and the anti-collision ring, the connecting band between the individual slips is broken, and the slip monomer is outwards spread and anchored on the inner wall of the sleeve pipe.

The utility model discloses a set up whole slips, thrust collar, prevent that the bridging from receiving the impact deformation and taking place to sit in advance at the in-process of going into the well and seal the phenomenon, sit and seal the position more accurate, set up one-way sawtooth and one-way sawtooth groove, guaranteed that the compression of packing element is reliable, set up the deformation wriggling that the spring can take the initiative the elastic compensation packing element, make the packing element resume best encapsulated situation, the utility model discloses used primary material all can dissolve, removes the drilling link from, and it is old and useless to reduce the operation.

Claims

1. A bridge plug comprising a central tube (1), characterized in that: the lower end of the central tube (1) is connected with an anti-collision ring (12) through threads, a push ring (2) is arranged below the step at the upper part of the central tube (1), and a slip (3), a cone (5) and a protective bowl (7) are sequentially sleeved between the push ring (2) and the anti-collision ring (12) in a symmetrical manner by taking a rubber cylinder (8) as a center;

wherein, a plurality of springs (6) are arranged between the cone body (5) and the protective bowl (7) along the circumferential direction and are arranged in holes formed on the circumference of the end surface of the protective bowl (7);

the inner hole of the cone body (5) is provided with one-way sawtooth grooves (11), at least three one-way sawtooth grooves (11) are arranged on one side of the cone body (5) close to the rubber cylinder (8), one-way sawteeth (10) are correspondingly arranged on the central tube (1), the one-way sawteeth (10) on the central tube (1) extend to the position of the rubber cylinder (8), the one-way sawteeth (10) and the one-way sawtooth grooves (11) are in clearance fit connection in size, and are in one-way direction and all point to the center of the rubber cylinder (8) as the direction;

the inner hole of the protective bowl (7) is larger than the maximum outer diameters of the unidirectional sawteeth (10) and the unidirectional sawtooth grooves (11);

the protective bowl (7) is in contact with the ring surface of the rubber cylinder (8), an annular groove is formed in the central tube (1), a thrust ring (9) is arranged in the annular groove, and the outer diameter of the thrust ring (9) is larger than the inner diameter of the protective bowl (7);

slips (3) be an overall structure, it has not less than six axial bar grooves (13) to open on slips (3) outer cylinder face, this bar groove (13) divide into the independent slips of interconnect of not less than six with overall structure slips (3).

2. A bridge plug as claimed in claim 1, wherein: and when the spring (6) is installed, the spring (6) is in a maximum compression state.

3. A bridge plug as claimed in claim 1, wherein: the slips (3) are characterized in that a plurality of ceramic cylindrical teeth (4) are embedded outside the slips (3).

4. A bridge plug as claimed in claim 1, wherein: the middle part of the inner hole of the rubber cylinder (8) is provided with a V-shaped ring groove.

5. A bridge plug as claimed in claim 1, wherein: the outer diameter of the push ring (2), the rubber cylinder (8), the ceramic cylindrical teeth (4), the cone body (5), the protective bowl (7) and the anti-collision ring (12) is the same as the outer diameter of the push ring (2).

6. A bridge plug as claimed in claim 1, wherein: the rubber sleeve (8) is soluble rubber, and the rest elements are soluble materials of magnesium-aluminum alloy.