CN212803155U

CN212803155U - Single slip type staged fracturing soluble bridge plug

Info

Publication number: CN212803155U
Application number: CN202021929722.2U
Authority: CN
Inventors: 曾斌; 杨超; 刘涛; 陈霖
Original assignee: Sichuan Jiebeitong Energy Technology Co ltd
Current assignee: Sichuan Jiebeitong Energy Technology Co ltd
Priority date: 2020-09-07
Filing date: 2020-09-07
Publication date: 2021-03-26
Anticipated expiration: 2030-09-07

Abstract

The utility model discloses a soluble bridging plug of single slips formula staged fracturing, include the dabber that is made by soluble material, dabber left end surface is equipped with the support step, be equipped with support ring, upper back ring, packing element, lower back ring, lower support ring, lower cone in proper order on the dabber on support step right side, the right-hand member of lower cone links to each other with lower slips, the slips surface is equipped with the slips tooth down, slips left end internal surface is equipped with the conical surface that matches with the lower cone, slips right-hand member links to each other with the anticollision guide shoe down; a one-way locking structure is arranged between the lower cone and the mandrel, and the locking direction of the one-way locking structure is along the axial direction of the mandrel and is far away from the direction of the anti-collision guide shoe; and an inner rubber cylinder annular space is arranged in the rubber cylinder, and the rubber cylinder is connected with the mandrel in a sealing manner. The utility model discloses simple structure, anchoring force are strong, take place great deformation undergauge when serious at the sleeve pipe, can repeat and go into the layering fracturing assigned position smoothly.

Description

Single slip type staged fracturing soluble bridge plug

Technical Field

The utility model relates to a layering staged fracturing construction tool technical field, in particular to soluble bridge plug of single slips formula staged fracturing.

Background

At present, with the rapid development of society, the energy demand is continuously increased, conventional oil and gas resources are continuously reduced, unconventional oil and gas resources are greatly exploited, and in addition, the unconventional oil and gas resources which are discovered at present are very rich, mainly including some compact shale gas, shale oil, coal bed gas and the like. However, unconventional oil and gas resources face development difficulties of low permeability and even ultra-low permeability, and how to improve the recovery ratio of a low-permeability oil and gas reservoir gradually becomes a problem to be continuously solved in the oil and gas development field at home and abroad. At present, the cable composite bridge plug perforation combined staged fracturing technology is widely adopted as a development mode for improving the yield of a single well. However, after construction operation, the composite bridge plug has large drilling and grinding chips and low drilling and grinding efficiency, the chips easily block the ground flow, the construction period and the cost are increased, and when the casing pipe deforms seriously in the construction process, the bridge plug is difficult to drop and cannot reach the construction position. In addition, most of the existing bridge plugs are of double-slip structures, and the existing bridge plugs are long in length, so that the pressure bearing capacity is reduced, the size is large, and the bridge plugs are inconvenient to trip into a well.

SUMMERY OF THE UTILITY MODEL

To the above problem, the utility model aims at providing a soluble bridge plug of single slips formula staged fracturing, it has characteristics such as simple structure, anchoring force are strong, and takes place great deformation undergauge seriously at the sleeve pipe, can go into the separate layer fracturing assigned position smoothly.

The technical scheme of the utility model as follows:

a single slip type staged fracturing soluble bridge plug comprises a mandrel made of a soluble material, wherein a supporting step is arranged on the outer surface of the left end of the mandrel, an upper supporting ring, an upper back ring, a rubber cylinder, a lower back ring, a lower supporting ring and a lower cone are sequentially arranged on the mandrel on the right side of the supporting step, the right end of the lower cone is connected with a lower slip, slip teeth are arranged on the outer surface of the lower slip, a tapered surface matched with the lower cone is arranged on the inner surface of the left end of the lower slip, and the right end of the lower slip is connected with an anti-collision guide shoe; a one-way locking structure is arranged between the lower cone and the mandrel, and the locking direction of the one-way locking structure is along the axial direction of the mandrel and is far away from the direction of the anti-collision guide shoe; and an inner rubber cylinder annular space is arranged in the rubber cylinder, and the rubber cylinder is connected with the mandrel in a sealing manner.

Preferably, the outer diameter of the lower slip is 80mm, the outer diameter of the lower slip formed after the slip teeth are assembled is 83mm, and the outer diameter of the anti-collision guide shoe is 88 mm.

Preferably, the one-way locking structure comprises a lock ring positioned between the lower cone and the mandrel, and the contact surface of the lock ring and the lower cone is provided with mutually matched latch teeth.

Preferably, the upper back ring and the lower back ring, and the upper support ring and the lower support ring are symmetrically arranged with respect to the rubber tube.

Preferably, the support step and the part of the upper support ring close to the mandrel are adjacently and closely arranged, and the support step and the part of the upper support ring far from the mandrel are not closely arranged and form an included angle I; the lower cone and the part of the lower support ring, which is close to the mandrel, are adjacently and closely arranged, and the lower cone and the part of the lower support ring, which is far away from the mandrel, are not closely arranged, and an included angle II is formed between the lower cone and the part of the lower support ring; the first included angle and the second included angle are acute angles, and the angle of the first included angle is larger than that of the second included angle.

Preferably, the lower slip is of an integral structure and is divided into 6 pieces on the integral structure, and 4 slip teeth are uniformly distributed on each piece of the lower slip.

Preferably, a guide groove is axially formed between two adjacent lower slips, and a guide column matched with the guide groove is arranged on the lower cone.

Preferably, the right end of each lower slip is provided with a groove sunken towards the left end of the mandrel, and the left end of the anti-collision guide shoe is provided with a bulge matched with the groove.

Preferably, the right end of the anti-collision guide shoe is provided with a flow guide hole.

Preferably, the outer surface of the anti-collision guide shoe is provided with a plurality of anti-abrasion teeth, the anti-abrasion teeth are uniformly distributed in the radial direction of the anti-collision guide shoe to form two rows, and the two rows of anti-abrasion teeth are distributed in a staggered mode.

The utility model has the advantages that:

the utility model is a single slip type bridge plug, which has the characteristics of simple structure, strong anchoring force and the like, and can smoothly drop into a layered fracturing designated position when the sleeve pipe has large deformation and serious necking; the well fluid is made of soluble materials, and can be dissolved by the well fluid along with the lapse of time after the setting is finished, so that the later salvaging procedures are reduced, the blockage and the drill sticking of a well fluid return pipeline are avoided, and the well fluid return efficiency is improved; the full drift diameter of the sleeve can be realized without drilling and grinding the drift well, and the operation cost is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

FIG. 1 is a schematic structural view of the single slip type staged fracturing soluble bridge plug of the present invention;

fig. 2 is the structural schematic diagram of an embodiment of the single slip type staged fracturing soluble bridge plug unidirectional locking structure of the present invention.

Reference numbers in the figures:

1-mandrel, 2-supporting step, 3-upper supporting ring, 4-upper back ring, 5-rubber cylinder, 6-lower back ring, 7-lower supporting ring, 8-lower cone, 9-lower slip, 10-slip tooth, 11-anti-collision guide shoe, 12-one-way locking structure, 13-rubber cylinder inner annular space, 14-guide groove, 15-guide column, 16-groove, 17-bulge, 18-guide hole and 19-anti-abrasion tooth.

Detailed Description

The present invention will be further explained with reference to the drawings and examples.

It should be noted that, in the present application, the embodiments and the technical features of the embodiments may be combined with each other without conflict.

It is noted that, unless otherwise indicated, 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.

In the present application, the terms "first", "second", and the like are used for distinguishing similar objects, and not for describing a particular order or sequence order, unless otherwise specified. It is to be understood that the terms so used; the terms "upper", "lower", "left", "right", and the like are used generally with respect to the orientation shown in the drawings, or with respect to the component itself in a vertical, or gravitational orientation; likewise, "inner", "outer", and the like refer to the inner and outer relative to the contours of the components themselves for ease of understanding and description. The above directional terms are not intended to limit the present invention.

As shown in fig. 1-2, a single slip type staged fracturing soluble bridge plug comprises a mandrel 1 made of a soluble material, wherein a supporting step 2 is arranged on the outer surface of the left end of the mandrel 1, an upper supporting ring 3, an upper back ring 4, a rubber cylinder 5, a lower back ring 6, a lower supporting ring 7 and a lower cone 8 are sequentially arranged on the mandrel 1 on the right side of the supporting step 2, the upper back ring 4 and the lower back ring 6, the upper supporting ring 3 and the lower supporting ring 7 are symmetrically arranged relative to the rubber cylinder 5, the right end of the lower cone 8 is connected with a lower slip 9, slip teeth 10 are arranged on the outer surface of the lower slip 9, a tapered surface matched with the lower cone 8 is arranged on the inner surface of the left end of the lower slip 9, and the right end of the lower slip 9 is connected with an anti-collision guide shoe 11; a one-way locking structure 12 is arranged between the lower cone 8 and the mandrel 1, and the locking direction of the one-way locking structure 12 is along the axial direction of the mandrel 1 and is far away from the anti-collision guide shoe 11; an inner rubber cylinder annular space 13 is arranged in the rubber cylinder 5, the rubber cylinder 5 is connected with the mandrel 1 in a sealing mode, and therefore the overall sealing performance of the bridge plug can be improved. The arrangement of the supporting steps 2 and the slip teeth 10 can provide strong anchoring force for the bridge plug when the bridge plug is pressurized.

In the above embodiment, optionally, the functional components of the bridge plug except the slip teeth 10 are made of materials with different dissolution rates, the dissolution rate is determined according to the functions of the functional components, the slip teeth 10 are cylindrical alloy particles or cylindrical ceramic particles, optionally, the outer surfaces of the slip teeth 10 are coated with hard coatings, and the strength of each slip tooth 10 is the same. Therefore, on one hand, the requirements of normal construction such as pumping and fracturing on the site can be met, and on the other hand, when abnormal conditions such as casing change wells, perforating gun string faults, ground fracturing equipment faults and other uncontrollable factors occur, the abnormal conditions can be processed in the site within a certain time.

In a particular embodiment, the mandrel 1 is integrally formed with the support step 2.

In a specific embodiment, the outer diameter of the lower slip 9 is 80mm, the outer diameter of the lower slip 9 formed after the slip teeth 10 are assembled is 83mm, and the outer diameter of the bump guide 11 is 88 mm. The external diameter of smaller size can make the utility model discloses it is more smooth to go into down when the sleeve pipe takes place to deform.

In a specific embodiment, the one-way locking structure 12 comprises a lock ring positioned between the lower cone 8 and the mandrel 1, and the contact surface of the lock ring and the lower cone 8 is provided with mutually matched latch teeth which can prevent the lock ring from moving along the axial direction of the mandrel 1 to the direction away from the crashworthy guide shoe 11.

In a specific embodiment, the support step 2 and the part of the upper support ring 3 close to the mandrel 1 are adjacently and closely arranged, and the support step 2 and the part of the upper support ring 3 far from the mandrel 1 are not closely arranged and form an included angle I; the lower cone 8 and the part of the lower support ring 7 close to the mandrel 1 are adjacently and closely arranged, and the lower cone 8 and the part of the lower support ring 7 far from the mandrel 1 are not closely arranged and form an included angle II; the first included angle and the second included angle are acute angles, and the angle of the first included angle is larger than that of the second included angle. The first included angle and the second included angle can guarantee that when the rubber sleeve 5 expands, the upper supporting ring 3 and the lower supporting ring 7 can be sufficiently spread open, and the rubber sleeve is protected while expansion of the rubber sleeve to a greater extent is guaranteed.

In order to enhance the anchoring force and improve the stability, optionally, the lower slip 9 is of a unitary structure and is divided into 6 pieces on the whole, and 4 slip teeth 10 are uniformly distributed on each piece of the lower slip 9.

In order to make the segments more uniform when the lower slips 9 are set, optionally, a guide groove 14 is axially arranged between two adjacent segments of the lower slips 9, and a guide post 15 matched with the guide groove 14 is arranged on the lower cone 8. In order to prevent the mandrel 1 from being blocked during the flowback, optionally, a groove 16 recessed toward the left end of the mandrel 1 is formed at the right end of each lower slip 9, a protrusion 17 matched with the groove 16 is formed at the left end of the anti-collision guide shoe 11, and a flow guide hole 18 is formed at the right end of the anti-collision guide shoe 11.

In a specific embodiment, the outer surface of the anti-collision guide shoe 11 is provided with a plurality of anti-wear teeth 19, the anti-wear teeth 19 are uniformly distributed in the radial direction of the anti-collision guide shoe 11 to form two rows, and the anti-wear teeth 19 in the two rows are distributed in a staggered manner. So can play wear-resisting protection's effect, improve at the in-process of going into the well the utility model discloses a life.

Use the utility model discloses the time, send the bridging plug to the sleeve pipe in the selected layer position department, start the setting instrument, the setting instrument promotes the thrust ring and slides along the dabber, extrudees the packing element, makes the radial expansion of packing element hug closely the interior wall of sleeve pipe, the thrust ring continues to move and promotes down the cone, the internal conical surface that the slips made down mechanism atress and is strutted the extension down, the slips separates from the weak point fracture down to, slips tooth anchoring in the interior wall of sleeve pipe, the setting is accomplished.

The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiments, and although the present invention has been disclosed with the preferred embodiments, it is not limited to the present invention, and any skilled person in the art can make some modifications or equivalent embodiments without departing from the scope of the present invention, but all the technical matters of the present invention are within the scope of the present invention.

Claims

1. A single slip type segmented fracturing soluble bridge plug is characterized by comprising a mandrel made of a soluble material, wherein a supporting step is arranged on the outer surface of the left end of the mandrel, an upper supporting ring, an upper back ring, a rubber cylinder, a lower back ring, a lower supporting ring and a lower cone are sequentially arranged on the mandrel on the right side of the supporting step, the right end of the lower cone is connected with a lower slip, slip teeth are arranged on the outer surface of the lower slip, a conical surface matched with the lower cone is arranged on the inner surface of the left end of the lower slip, and the right end of the lower slip is connected with an anti-collision guide shoe; a one-way locking structure is arranged between the lower cone and the mandrel, and the locking direction of the one-way locking structure is along the axial direction of the mandrel and is far away from the direction of the anti-collision guide shoe; and an inner rubber cylinder annular space is arranged in the rubber cylinder, and the rubber cylinder is connected with the mandrel in a sealing manner.

2. The single-slip segmented fracturing soluble bridge plug according to claim 1, wherein the outer diameter of the lower slip is 80mm, the outer diameter of the lower slip formed after the slip teeth are assembled is 83mm, and the outer diameter of the anti-collision guide shoe is 88 mm.

3. The single slip segmented fracturing soluble bridge plug according to claim 1, wherein the one-way locking structure comprises a locking ring between the lower cone and the mandrel, and the contact surface of the locking ring and the lower cone is provided with mutually matched clamping teeth.

4. The single slip segmented frac soluble bridge plug of claim 1 wherein said upper and lower back rings, said upper and lower support rings are all symmetrically disposed about said packing element.

5. The single slip segmented fracturing soluble bridge plug according to claim 4, wherein the support step and the part of the upper support ring close to the mandrel are adjacently and closely arranged, and the support step and the part of the upper support ring far from the mandrel are not closely arranged and form an included angle I; the lower cone and the part of the lower support ring, which is close to the mandrel, are adjacently and closely arranged, and the lower cone and the part of the lower support ring, which is far away from the mandrel, are not closely arranged, and an included angle II is formed between the lower cone and the part of the lower support ring; the first included angle and the second included angle are acute angles, and the angle of the first included angle is larger than that of the second included angle.

6. The single-slip segmented fracturing soluble bridge plug according to claim 1, wherein the lower slip is of a monolithic structure and is divided into 6 pieces on the whole, and 4 slip teeth are uniformly distributed on each piece of the lower slip.

7. The single-slip segmented fracturing soluble bridge plug as claimed in claim 6, wherein a guide groove is axially arranged between two adjacent lower slips, and a guide column matched with the guide groove is arranged on the lower cone.

8. The single-slip segmented fracturing soluble bridge plug as claimed in claim 6, wherein each lower slip right end is provided with a groove recessed towards the mandrel left end, and the anti-collision guide shoe left end is provided with a protrusion matching with the groove.

9. The single slip segmented fracturing soluble bridge plug according to claim 1, wherein the right end of the anti-collision guide shoe is provided with a diversion hole.

10. The single-slip segmented fracturing soluble bridge plug as claimed in any one of claims 1 to 9, wherein the outer surface of the anti-collision guide shoe is provided with a plurality of anti-abrasion teeth, the anti-abrasion teeth are uniformly distributed in the radial direction of the anti-collision guide shoe to form a double row, and the anti-abrasion teeth of the double row are distributed in a staggered manner.