CN220226811U - Large-diameter removable bridge plug - Google Patents

Abstract

The utility model discloses a large-drift diameter removable bridge plug, which comprises an upper joint, a first end ring, a setting starting pin, a lower cone and a bidirectional slip, wherein a third shearing pin is arranged on the upper joint, the inner wall of the upper joint is connected with a central pipe through threads, the inside of the upper joint is connected with a plug through threads, an O-shaped sealing ring is arranged on the outer side of the plug and forms a seal with the central pipe, and a locking ring sleeve is arranged on the outer side of the first end ring through threads.

Description

Large-diameter removable bridge plug

Technical Field

The utility model relates to the field of oil and gas reservoir exploitation, in particular to a large-drift-diameter removable bridge plug.

Background

In the production of oil and gas wells, it is often necessary to temporarily seal the wellbore for a period of time in order to seal the bottom hole pressure for other drilling and completion operations. Conventional techniques typically involve running a bridge plug to effect occlusion. The bridge plugs are usually mechanical bridge plugs, no through holes are formed in the middle of the bridge plugs, and after the bridge plugs are blocked, the channel is required to be re-established by putting a drilling and grinding tool into the drilling and grinding tool for grinding and removing, so that extra high construction cost is generated in some ultra-deep wells or offshore oil fields with high cost, and the bridge plugs are designed to be in a recyclable form;

after the plugging is finished, a special recovery tool is required to be put into the plugging to carry out unsealing recovery, and the unsealing recovery mechanism of the removable bridge plug is usually positioned at the top of the tool, so that impurities and sediments on the upper part of the bridge plug can be accumulated at the top of the tool after the bridge plug plugs a casing pipe is plugged, the unsealing recovery of the bridge plug at the later stage is at great risk, the removable bridge plug is generally manufactured by high-strength alloy steel which cannot be drilled and ground, and once the unsealing fails, the great risk of the well is caused, and even the major repair is required.

Disclosure of Invention

The utility model aims to provide a large-diameter removable bridge plug to solve the problems that in the background art, a deblocking recovery mechanism for the removable bridge plug is usually arranged at the top of a tool, which can cause impurities and sediments on the upper part of the bridge plug to be accumulated on the top of the tool after the bridge plug blocks a packer casing, so that huge risks are caused to deblocking recovery of the bridge plug at the later stage, and the removable bridge plug is usually manufactured by adopting high-strength alloy steel which cannot be drilled and ground, and once deblocking fails, huge risks are caused to the well and even overhaul is needed.

In order to achieve the above purpose, the present utility model provides the following technical solutions: the utility model provides a big latus rectum removable bridging plug, includes top connection, first end ring, setting start pin, lower cone and two-way slips, be provided with the third on the top connection and cut the pin, the top connection inner wall has the center tube through threaded connection, the inside jam that has through threaded connection of top connection, O type sealing washer and form sealedly with the center tube is installed in the jam outside, there is the catch cover first end ring outside through threaded connection, the center tube lower extreme has the deblocking pawl through threaded connection, the guide way that evenly offered of deblocking pawl lower part, the lower joint is installed to deblocking pawl lower part joint, the inside through connection of lower joint has the deblocking pin nail, deblocking pin nail surface bottom is connected with the deblocking ring that fixes with the center tube.

Preferably, the outer side of the first end ring is connected with a locking ring sleeve through threads, the inner wall of the locking ring sleeve is connected with a locking ring through threads, and a fixing pin is arranged between the locking ring sleeve and the locking ring.

Preferably, the second end ring has been cup jointed in the center tube outside, the center tube outside is located second end ring one side position department and has cup jointed an end packing element, center tube outside is located an end packing element one end and has cup jointed a well packing element, the quantity of second end ring and end packing element all sets up to two and sets up with the central line symmetry of well packing element.

Preferably, the second shear pin is installed in the two-way slips outside, the center tube outside is located second end ring one end position department and has cup jointed the cone, the inside through connection of cone has first shear pin, the fixed slot has evenly been seted up to two-way slips middle part, the mid-mounting of center tube has and grabs the ring.

Preferably, the sawtooth screw thread has all been seted up to the catch inside and outside, and is the design of opening C type, unidirectional sawtooth screw thread has been seted up in the center tube outside, the catch inside is provided with unidirectional sawtooth screw thread and matches with unidirectional sawtooth screw thread on the center tube.

Preferably, the lower joint is internally provided with a groove, the lower end of the deblocking pawl is provided with a bulge, and the bulge and the groove are matched with each other.

Compared with the prior art, the utility model has the beneficial effects that:

the utility model is characterized in that the deblocking mechanism is positioned at the bottommost part and is not influenced by bottom hole impurities and sediments, the bridge plug is also provided with a structure capable of being provided with a soluble plug, after the soluble plug is dissolved, the bridge plug can become a recyclable intubation packer with a large inner diameter, and the recyclable intubation packer can be recycled at the later stage or can be used as a packer at the bottom hole for a long time.

Drawings

FIG. 1 is a schematic view of the overall structure of a large-diameter removable bridge plug according to the present utility model;

FIG. 2 is a cross-sectional view of a large diameter removable bridge plug integral center tube according to the present utility model.

In the figure: 1. an upper joint; 2. a first end ring; 3. a lock ring sleeve; 4. blocking; 5. a third shear pin; 6. an O-shaped sealing ring; 7. fixing pins; 8. a locking ring; 9. a second end ring; 10. an end rubber cylinder; 11. a middle rubber cylinder; 12. a central tube; 13. an upper cone; 14. setting a starting pin; 15. a fixing groove; 16. capturing rings; 17. a two-way slip; 18. a first shear pin; 19. a lower cone; 20. a second shear pin; 21. a guide groove; 22. deblocking pawl; 23. deblocking the pin; 24. and (5) unsealing the ring.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1-2, the present utility model provides a technical solution: the large-diameter removable bridge plug comprises a removable bridge plug main body, a removable bridge plug external structure, a removable bridge plug sealing part and a removable bridge plug anchoring part;

the removable bridge plug body consists of an upper joint 1, a central tube 12, a deblocking pawl 22, a deblocking ring 24 and a lower joint 25, wherein a third shear pin 5 is arranged on the upper joint 1 and can be connected with a special setting tool for setting the bridge plug when the bridge plug is in a well, the upper joint 1 and the central tube 12 are connected through threads, a plug 4 is connected inside the upper joint 1 through threads, an O-shaped sealing ring 6 is arranged on the plug 4 to form a seal with the central tube 12, the plug 4 can be made of insoluble metal or soluble metal or drillable material, the lower end of the central tube 12 is connected with the deblocking pawl 22 through threads, the lower end of the deblocking pawl 22 is provided with a bulge and is a pawl mechanism, the lower part is provided with guide grooves 21 uniformly distributed, and the bulge is connected with grooves of the lower joint 25 and is fixed through the deblocking ring 24 and the deblocking pin 23;

the external structure of the removable bridge plug is a sitting and blocking locking mechanism consisting of a first end ring 2, a lock ring sleeve 3, a setting starting pin 14, a fixing pin 7 and a lock ring 8, wherein the first end ring 2 can form abutting joint with a sitting sleeve of a setting tool when the bridge plug is set, the end ring 2 is in threaded connection with the lock ring sleeve 3, the lock ring 8 is in threaded connection with the lock ring sleeve 3 and can prevent the lock ring 8 from rotating relative to the lock ring sleeve 3 through the fixing pin 7, saw tooth threads are designed inside and outside the lock ring 8, the design is an open C-shaped design, the outer side of a central tube 12 is provided with unidirectional saw tooth threads, unidirectional saw tooth threads are arranged inside the lock ring 8 and are matched with unidirectional saw tooth threads on the central tube 12, so that the lock ring sleeve 3 and the lock ring 8 can only move towards the right, and can be locked by unidirectional saw tooth when moving towards the left;

the removable bridge plug sealing part consists of a second end ring 9, an end rubber cylinder 10 and a middle rubber cylinder 11, wherein the second end ring 9, the end rubber cylinder 10 and the middle rubber cylinder 11 are sequentially sleeved on the outer circle of a central tube 12, the removable bridge plug sealing part consists of a two-way slip 17, an upper cone 13 and a lower cone 19, the two-way slip 17 and the central tube 12 are fixed through a second shearing pin 20 and are fixed through a first shearing pin 18 with the upper cone 13, uniformly distributed fixing grooves 15 are formed in the middle of the two-way slip 17, and a grab ring 16 is arranged in the middle of the central tube 12 and used for lifting the two-way slip 17 during deblocking to help better deblocking;

during construction, a setting tool is used for descending the tool into a well, a pull rod of the setting tool is connected with the upper joint 1 through the third shearing pin 5, a push cylinder of the setting tool is in mutual abutting connection with the first end ring 2, the upper joint 1 and the mandrel are relatively static during setting, the push cylinder of the setting tool pushes the external part of the removable packer to the right, when overcoming the shearing value of the setting starting pin 14, the rubber barrel combination is compressed, the bidirectional slips 17 are protruded upwards and anchored on a sleeve, the one-way locking mechanism consisting of the locking ring sleeve 3 and the locking ring 8 locks the setting state, and when further improving the setting force, the third shearing pin 5 is sheared, and the bridge plug is successfully set in the sleeve to be sealed;

because the plug 4 can be made of drillable or dissolvable materials, when the production channel needs to be reestablished, the plug 4 can be drilled or ground or the plug 4 can be dissolved, and the bridge plug is converted into a cannula packer with a large diameter;

when the tool needs to be unsealed, the unsealing tool is put into the ground, the unsealing pin 23 on the unsealing ring 24 is sheared by the unsealing tool, the tool is pulled upwards through the internal thread at the upper joint 1, the pawl of the unsealing pawl 22 loses the support of the unsealing ring 24 under the action of pulling force, and contracts inwards, so that the lower end of the central tube 12 is disconnected with the lower joint 25, and the bridge plug rubber barrel is lifted upwards further, the slips retract, and the bridge plug rubber barrel is completely unsealed and recovered.

It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims (6)

1. The utility model provides a big latus rectum removable bridging plug, includes top connection (1), first end ring (2), sets up start pin (14), lower cone (19) and two-way slips (17), its characterized in that: the novel sealing device is characterized in that a third shearing pin (5) is arranged on the upper joint (1), a central tube (12) is arranged on the inner wall of the upper joint (1) through threaded connection, a plug (4) is arranged inside the upper joint (1) through threaded connection, an O-shaped sealing ring (6) is arranged on the outer side of the plug (4) and is sealed with the central tube (12), a locking ring sleeve (3) is arranged on the outer side of the first end ring (2) through threaded connection, an unsealing pawl (22) is arranged at the lower end of the central tube (12) through threaded connection, a guide groove (21) is uniformly formed in the lower portion of the unsealing pawl (22), a lower joint (25) is arranged at the lower portion of the unsealing pawl (22) in a clamping connection mode, and an unsealing ring (24) fixed with the central tube (12) is connected to the bottom of the outer surface of the unsealing pin (23).

2. A large diameter removable bridge plug as defined in claim 1, wherein: the inner wall of the lock ring sleeve (3) is connected with a lock ring (8) through threads, and a fixing pin (7) is arranged between the lock ring sleeve (3) and the lock ring (8).

3. A large diameter removable bridge plug as defined in claim 1, wherein: the center tube (12) outside has cup jointed second end ring (9), center tube (12) outside is located second end ring (9) one side position department and has cup jointed end packing element (10), center tube (12) outside is located end packing element (10) one end and has cup jointed well packing element (11), the quantity of second end ring (9) and end packing element (10) all sets up to two and sets up with the central line symmetry of well packing element (11).

4. A large diameter removable bridge plug as defined in claim 1, wherein: the second shearing pin (20) is installed in two-way slips (17) outside, last cone (13) have been cup jointed in center tube (12) outside being located second end ring (9) one end position department, go up cone (13) inside through-connection and have first shearing pin (18), fixed slot (15) have evenly been seted up in two-way slips (17) middle part, mid-mounting of center tube (12) has and grabs ring (16).

5. A large diameter removable bridge plug as defined in claim 2, wherein: the inner side and the outer side of the lock ring (8) are respectively provided with a sawtooth thread, the lock ring is of an open C-shaped design, the outer side of the central tube (12) is provided with a unidirectional sawtooth thread, and the inside of the lock ring (8) is provided with a unidirectional sawtooth thread which is matched with the unidirectional sawtooth thread on the central tube (12).

6. A large diameter removable bridge plug as defined in claim 1, wherein: the lower joint (25) is internally provided with a groove, the lower end of the deblocking pawl (22) is provided with a bulge, and the bulge and the groove are matched with each other.