CN216811639U

CN216811639U - Metal sealing bridge plug with starting limiting ring

Info

Publication number: CN216811639U
Application number: CN202220361013.1U
Authority: CN
Inventors: 张国锋; 陈龙; 李光泉; 褚晓丹; 冯德华; 方俊明; 张俊
Original assignee: Sinopec Jianghan Petroleum Engineering Co ltd Shale Gas Extraction Technology Service Co; Sinopec Oilfield Service Corp; Sinopec Jianghan Petroleum Engineering Co Ltd
Current assignee: Sinopec Jianghan Petroleum Engineering Co ltd Shale Gas Extraction Technology Service Co; Sinopec Oilfield Service Corp; Sinopec Jianghan Petroleum Engineering Co Ltd
Priority date: 2022-02-22
Filing date: 2022-02-22
Publication date: 2022-06-24
Anticipated expiration: 2032-02-22

Abstract

The utility model relates to a metal sealing bridge plug with a starting limit ring, which comprises a cone, the starting limit ring, a sealing ring, an O-shaped ring, a slip, anchoring teeth and a guide shoe, wherein the cone is provided with a groove; the cone is provided with a sealing ball seat, an inclined conical surface, an upper step, an inner hole and an outer ratchet; the slips are provided with a left stress hole, a left slot, a first round hole, a right slot, a right stress hole, a boss, an inner conical surface and an inner ratchet; the guide shoe is provided with a groove, an inclined plane, a second round hole, an internal thread and a threaded hole, and the groove is in cross installation fit with the boss. The utility model has the advantages of few parts, convenient assembly, short whole body, light weight and high dissolution speed, has the start limiting ring for preventing early start, greatly reduces the risk of setting and releasing when the bridge plug does not reach the designated position in the process of putting the bridge plug into the shaft, has high construction safety and stable performance, and is more favorable for application in a horizontal well with a long horizontal section.

Description

Metal sealing bridge plug with starting limiting ring

Technical Field

The utility model relates to the technical field of underground sectional tools in the petroleum and gas industry, in particular to a metal sealing bridge plug with a starting limiting ring.

Background

At present, the pumping bridge plug and multi-stage perforation combined staged fracturing technology is widely applied to unconventional oil and gas exploration and development processes of shale oil and gas at home and abroad and the like. The segmented bridge plug adopted in the technology is mainly made of easily drilled composite materials, after fracturing is completed, the segmented bridge plug made of the materials needs to use coiled tubing equipment to drill and remove all bridge plugs to recover an underground production channel, fragments are left in the underground during bridge plug drilling and removing process, and the problems of high safety risk, long construction period, high operation cost and the like exist. In recent years, on-site construction is gradually trying to use a segmented bridge plug made of a soluble material, and after fracturing is completed, the bridge plug is dissolved by using downhole liquid, so that a bridge plug drilling-out procedure is not needed, the construction period is greatly shortened, and the cost is saved.

But the appearance structure of the bridge plug made of soluble materials is similar to that of the bridge plug made of composite materials at present, and the structure of anchoring by slips and sealing by rubber is adopted, so that the structure has the following problems: 1. the volume is large, the soluble rubber is low in dissolution speed, the purpose of rapid dissolution cannot be achieved, and the next construction procedure is influenced; 2. the design structure for preventing the early start is not available, and the bridge plug is probably started in advance when the bridge plug is lowered into a shaft due to crack of a slip of the bridge plug or expansion of a rubber cylinder caused by collision with a sleeve or liquid pressure fluctuation, so that the bridge plug is not reached to a specified position, and construction accidents are caused.

Disclosure of Invention

The utility model aims to solve the technical problem of providing a metal sealing bridge plug with a starting limit ring, which has the advantages of small volume, high dissolving speed and high construction safety.

The technical scheme adopted by the utility model for solving the technical problems is as follows: constructing a metal sealing bridge plug with a starting limit ring, which comprises a cone, the starting limit ring, a sealing ring, an O-shaped ring, a slip, anchoring teeth and a guide shoe;

the cone is provided with a sealing ball seat, an inclined conical surface, an upper step, an inner hole and an outer ratchet; the starting limiting ring and the sealing ring are sleeved on the outer side of the oblique conical surface, and the outer ratchet is arranged on the surface of the oblique conical surface;

the slip is provided with a left stress hole, a left slot, a first round hole, a right slot, a right stress hole, a boss, an inner conical surface and an inner ratchet; the inclined conical surface is matched with the inner conical surface, the outer ratchet is matched with the inner ratchet, the bosses are uniformly distributed at the right end of the slip body along the circumference, the first round hole is arranged at the middle position of the left slot and the right slot along the axis, and the anchoring teeth are fixed in the first round hole;

the guide shoe is provided with a groove, an inclined plane, a second round hole, an internal thread and a threaded hole, the groove is in cross installation and matching with the boss, the second round hole is uniformly distributed on the guide shoe body along the circumference, the anchoring teeth are installed in the second round hole, the internal thread is used for being connected with a bridge plug setting joint, and a fastening screw is installed in the threaded hole.

In the above scheme, the cone is further provided with an upper bayonet which is a square groove, the guide shoe is further provided with a lower bayonet, and the lower bayonet is matched with the upper bayonet.

In the scheme, the angle of the sealing ball seat is 30-60 degrees, and the roughness is 0.8-1.6.

In the scheme, the angle of the oblique conical surface is 5-10 degrees, and the roughness is 0.8-1.6.

In the above scheme, the outer ratchet and the inner ratchet are triangular and spiral.

In the scheme, the anchoring teeth are mounted in the first circular hole in a bonding mode through the fastening glue, and the highest point of each anchoring tooth is 1-2mm higher than the outer circular surface of the slip.

In the scheme, the axis of the first round hole and the axis of the slip form an included angle of 10-25 degrees.

The metal sealing bridge plug with the starting limit ring has the following beneficial effects:

1. the metal sealing bridge plug with the starting limiting ring provided by the utility model has the advantages of few parts, convenience in assembly, short whole body, light weight and high dissolving speed compared with a conventional soluble bridge plug without a rubber cylinder structure.

2. The metal sealing bridge plug with the starting limiting ring has a structural design for preventing early starting, the situation that the bridge plug is set when the bridge plug does not reach a specified position in the process of descending the bridge plug into a shaft can not occur, and the construction safety is high.

3. The metal sealing bridge plug with the start limiting ring provided by the utility model is completely made of water-soluble magnesium-aluminum alloy, is not influenced by the dissolution speed of rubber, and has stable performance and low cost compared with the conventional soluble bridge plug.

Drawings

The utility model will be further described with reference to the following drawings and examples, in which:

FIG. 1 is a profile view of a metal seal bridge plug with an activation limit ring according to the present invention;

FIG. 2 is a half-sectional view of a metal seal bridge plug with an activation limit ring according to the present invention;

FIG. 3 is a view of the external ratchet configuration of the metal seal bridge plug with activation limit ring of the present invention;

FIG. 4 is a view of the internal ratchet configuration of the metal seal bridge plug with activation limit ring of the present invention;

in the figure: 1-cone, 2-start limiting ring, 3-sealing ring, 4-O-shaped ring, 5-slip, 6-anchoring tooth and 7-guide shoe, 101-upper bayonet, 102-sealing ball seat, 103-inclined conical surface, 104-upper step, 105-inner hole, 106-outer ratchet, 201-inner conical surface, 301-inner conical surface, 302-outer conical surface, 303-O ring groove, 501-left stress hole, 502-left cutting seam, 503-first round hole, 504-right cutting seam, 505-right stress hole, 506-boss, 507-inner conical surface, 508-inner ratchet, 701-groove, 702-inclined surface, 704-lower bayonet, 704-second round hole, 705-inner thread, 706-threaded hole.

Detailed Description

For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

As shown in fig. 1-2, the metal seal bridge plug with an activation limiting ring of the utility model comprises a cone 1, an activation limiting ring 2, a seal ring 3, an O-ring 4, slips 5, anchoring teeth 6 and a guide shoe 7.

The cone 1 is made of low-hardness water-soluble magnesium-aluminum alloy materials and is designed with an upper bayonet 101, a sealing ball seat 102, an inclined conical surface 103, an upper step 104, an inner hole 105 and an outer ratchet 106. The upper bayonet 101 is a square groove. The sealing ball seat 102 has an angle of 30-60 deg. and a roughness of 0.8-1.6, and cooperates with the sealing ball to seal the inner bore 105. The angle of the oblique taper 103 is 5-10 deg., and the roughness is 0.8-1.6. The upper step 104 is matched with the bridge plug push cylinder, so that the bridge plug can be prevented from shaking in the process of descending into a shaft. The outer ratchet teeth 106 are of a triangular helical design.

The start limiting ring 2 is made of low-strength water-soluble magnesium-aluminum alloy material and is designed with an inner conical surface 201. The start limiting ring 2 is sleeved outside the cone 1, and the inner conical surface 201 is attached to the inclined conical surface 103 without seams. When the starting limit ring 2 is pushed from right to left, the starting limit ring 2 is propped off due to the increase of the outer diameter of the inclined conical surface 103, and the horizontal pushing force required during the propping off is 10-30 kN. A slit may be cut in the start limit ring 2 to reduce the amount of horizontal thrust required when the start limit ring 2 is propped open.

The sealing ring 3 is made of high-extensibility water-soluble magnesium-aluminum alloy material, the extensibility is 15-25%, and the sealing ring is provided with an inner conical surface 301, an outer circular surface 302 and an O-ring groove 303. The sealing ring 3 is sleeved outside the cone 1, and the inner conical surface 301 is attached to the inclined conical surface 103 without seams. The left side of the sealing ring 3 is tightly attached to the right side of the start limiting ring 2. When the sealing ring 3 is pushed from right to left, the overall diameter of the sealing ring 3 is increased due to the increase of the outer diameter of the inclined conical surface 103, but the sealing ring is not broken until the outer circular surface 302 is tightly attached to the inner wall of the sleeve, and the sealing ring 3 seals the annular gap between the cone 1 and the sleeve to isolate the pressure on two sides.

The O-shaped ring 4 is made of water-soluble rubber materials and is arranged in the O-shaped ring groove 303, when the outer circular surface 302 of the sealing ring 3 is tightly attached to the inner wall of the sleeve, the O-shaped ring 4 is cooperated with an annular gap between the sealing cone 1 and the sleeve to achieve the purpose of enhancing the sealing effect, but whether the O-shaped ring is arranged or not can be selected according to the requirements of an application party.

The slip 5 is made of high-strength water-soluble magnesium-aluminum alloy materials and is provided with a left stress hole 501, a left slit 502, a first round hole 503, a right slit 504, a right stress hole 505, a boss 506, an inner conical surface 507 and an inner ratchet 508. Slips 5 are sleeved outside the cone 1, and the left side of the slips 5 is tightly attached to the right side of the sealing ring 3. The left slot 502 cuts the slip 5 body from the right to the left but keeps a distance at the left end and is not cut, the right slot 503 cuts the slip 5 body from the left to the right but keeps a distance at the right end and is not cut, the slot widths of the left slot 502 and the right slot 503 are not 0.2-1mm, 4-8 slots are designed respectively, and the slots are evenly distributed on the slip 5 body along the circumference. The left stress hole 501 is arranged at the top end of the left side of the left slot 502, the right stress hole 505 is arranged at the top end of the right side of the right slot 504, and the diameters of the left stress hole 501 and the right stress hole 505 are slightly larger than the slot width of the slot. The first round holes 503 are arranged at the middle positions of the left slot 502 and the right slot 504, 2-4 round holes are arranged in each row along the axis of the slip 5, the round holes are evenly distributed on 8-16 rows on the body of the slip 5 along the circumference, and the axis of the first round holes 503 and the axis of the slip 5 form an included angle of 10-25 degrees. The bosses 506 are designed with 4-8 and are evenly distributed at the right end of the slip 5 body along the circumference. The inner conical surface 507 is fitted with the inclined conical surface 103 without seams, the inner ratchet 508 is in a triangular spiral design, and the direction of the triangle is opposite to that of the outer ratchet 106.

The anchoring teeth 6 are made of ultra-high hardness water-soluble magnesium-aluminum alloy materials, high-strength ceramics or hard alloys, and are mounted in the first round holes 503 in a bonding mode through high-temperature fastening glue, and the highest points of the anchoring teeth 6 are 1-2mm higher than the outer circular surface of the slips 5 after mounting.

When the slips 5 are pushed from right to left, the outer diameter of the inclined conical surface 103 is increased to enable the slips 5 to be uniformly opened along the left slot 502 and the right slot 504 until the anchoring teeth 6 bite the inner wall of the casing, and the bitten anchoring teeth 6 can prevent the slips 5 from being pushed from left to right, so that hydraulic pressure from the left side of the metal sealing bridge plug can be borne when the sealing ball seat 102 is matched with a setting ball to seal the inner hole 105 and the sealing ring 3 seals an annular space between the cone 1 and the casing. The left stress hole 501 and the right stress hole 505 are used for preventing the opened slips 5 from being broken along the left cut 502 and the right cut 504, so that the slips 5 are kept as a whole after being opened, which is beneficial to ensuring that all the anchoring teeth 6 can keep the same force to bite the inner wall of the casing, and the capability of the anchoring teeth 6 for resisting the hydraulic force from the left side of the metal seal bridge plug is enhanced. When the slips 5 are pushed from right to left, the inner ratchet 508 is matched with the outer ratchet 106, and under the action of the outer ratchet 106, the inner ratchet 508 can only move from right to left but cannot move from left to right, so that the reverse movement is prevented.

The guide shoe 7 is made of a fast-dissolving water-soluble magnesium-aluminum alloy material and is provided with a groove 701, a slope 702, a lower bayonet 703, a second round hole 704, an internal thread 705 and a threaded hole 706. The designed number of the grooves 701 is consistent with that of the bosses 506, the grooves 701 are evenly distributed at the left end of the guide shoe 7 body along the circumference, and the grooves 701 and the bosses 506 are in cross installation and matching, so that the slip 5 and the guide shoe 7 cannot rotate relatively. The chamfer 702 is of a symmetrical design and functions to facilitate the passage of a metal seal bridge through a potential barrier as it is being driven into the well. When the plug is drilled, the drilling and removing residual part of the previous metal sealing plug can be pushed down to the next metal sealing plug to be drilled, the lower bayonet 703 and the upper bayonet 101 can be matched with each other, and the drilling and removing residual part of the previous metal sealing plug is prevented from rotating along with the drill bit in the plug drilling process. 6-12 second round holes 704 are designed and evenly distributed on the guide shoe 7 body along the circumference, and anchoring teeth 6 are installed in the second round holes 704 and are used for preventing parts of the metal seal bridge plug from being worn and damaged due to contact with the casing wall when the metal seal bridge plug enters the well. The internal thread 705 is connected with a bridge plug setting joint, and is used for driving the internal thread 705 to move from right to left when a metal sealing bridge plug is started, so that the guide shoe 7, the slip 6, the sealing ring 3 and the start limiting ring 2 simultaneously move from right to left, the start limiting ring 2 is broken, the outer circular surface 302 of the sealing ring 3 is tightly attached to the inner wall of the sleeve, the anchoring teeth 6 arranged on the slip 6 bite the inner wall of the sleeve, and finally the internal thread 705 is broken, so that the setting process of the metal sealing bridge plug is realized. The threaded hole 706 can be provided with a fastening screw, and the auxiliary internal thread 705 is connected with the bridge plug setting joint without loosening.

While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the utility model as defined in the appended claims.

Claims

1. A metal sealing bridge plug with a starting limit ring is characterized by comprising a cone (1), the starting limit ring (2), a sealing ring (3), an O-shaped ring (4), a slip (5), anchoring teeth (6) and a guide shoe (7);

a sealing ball seat (102), an inclined conical surface (103), an upper step (104), an inner hole (105) and an outer ratchet (106) are arranged on the cone (1); the starting limiting ring (2) and the sealing ring (3) are sleeved on the outer side of the inclined conical surface (103), and the outer ratchet (106) is arranged on the surface of the inclined conical surface (103);

the slip (5) is provided with a left stress hole (501), a left slot (502), a first round hole (503), a right slot (504), a right stress hole (505), a boss (506), an inner conical surface (507) and an inner ratchet (508); the inclined conical surface (103) is matched with an inner conical surface (507), the outer ratchet (106) is matched with an inner ratchet (508), the bosses (506) are uniformly distributed at the right end of the slip (5) body along the circumference, the first round hole (503) is arranged at the middle position of the left slot (502) and the right slot (504) along the axis, and the anchoring tooth (6) is fixed in the first round hole (503);

be equipped with recess (701), inclined plane (702), second round hole (704), internal thread (705) and screw hole (706) on guide shoe (7), recess (701) with boss (506) cross arrangement cooperation, second round hole (704) are in along circumference evenly distributed on guide shoe (7) body, install in second round hole (704) anchor tooth (6), internal thread (705) are used for with bridge plug seat joint connection, install fastening screw in screw hole (706).

2. The metal sealing bridge plug with the starting limit ring is characterized in that an upper bayonet (101) is further arranged on the cone (1), the upper bayonet (101) is a square groove, a lower bayonet (703) is further arranged on the guide shoe (7), and the lower bayonet (703) is matched with the upper bayonet (101).

3. The metal sealing bridge plug with activation limit ring of claim 1, characterized in that the sealing ball seat (102) angle is 30-60 ° and roughness is 0.8-1.6.

4. The metal sealing bridge plug with start limit ring according to claim 1, characterized in that the angle of the oblique tapered surface (103) is 5-10 ° and the roughness is 0.8-1.6.

5. The metal sealing bridge plug with activation limit ring of claim 1, wherein the outer ratchet (106) and the inner ratchet (508) are triangular spiral.

6. The metal sealing bridge plug with the starting limit ring as recited in claim 1, characterized in that the anchoring tooth (6) is mounted in the first round hole (503) by a fastening glue, and the highest point of the anchoring tooth (6) is 1-2mm higher than the outer circular surface of the slip (5).

7. The metal seal bridge plug with activation limit ring of claim 1, wherein the first circular hole (503) axis is at an angle of 10-25 ° to the slip (5) axis.