CN213087959U

CN213087959U - Fishing type bridge plug with seal sending function

Info

Publication number: CN213087959U
Application number: CN202021451628.0U
Authority: CN
Inventors: 廉军; 赵元; 刘晓鹏; 刘一唯
Original assignee: Shenyang Huawei Petroleum Machinery Manufacturing Co ltd
Current assignee: Shenyang Huawei Petroleum Machinery Manufacturing Co ltd
Priority date: 2020-07-22
Filing date: 2020-07-22
Publication date: 2021-04-30
Anticipated expiration: 2030-07-22

Abstract

The utility model discloses a can drag for formula bridging plug with send and seal function, this can drag for formula bridging plug includes plugging device, anchoring device and send the sealing device, send the sealing device to include the top connection, with top connection outer wall threaded connection's last helmet, go up the overcoat, with top connection inner wall threaded connection's adapter sleeve to form the seat hydraulic cylinder in the annular space between last overcoat and adapter sleeve, be equipped with the seat piston in the seat hydraulic cylinder and carry the pusher for plugging device with seat piston thrust, be equipped with the seat shear pin between last overcoat and pusher, the adapter sleeve is the thin, the thick solid core ladder reducing adapter sleeve in lower part in upper portion, is equipped with axial drain blind hole in the upper end of adapter sleeve, is equipped with on the drain blind hole wall and carries the feed liquor hole to seat in the hydraulic cylinder with the seat high pressure water. The fishing bridge plug has the advantages of simple structure, high reliability and the like, can be set by adopting smaller water pressure, and has good setting effect.

Description

Fishing type bridge plug with seal sending function

Technical Field

The utility model relates to a bridge plug that is used for sealing shaft bottom or selective layer fracturing to use, especially a can drag for formula bridge plug with send and seal function.

Background

When the oil field seals the well bottom or selects the stratum fracturing, need use special bridging plug to carry out the shutoff to the sleeve pipe, need salvage the deblocking to the bridging plug after the operation. In the prior art, a tubular connecting sleeve is generally adopted in a bailable bridge plug for downhole sealing or selective fracturing, for example, a variable well bridge plug disclosed in CN201092846Y, the area of the setting piston end of the bailable bridge plug adopting the tubular connecting sleeve is small, and the contact area between the upper end surface of the setting piston and high-pressure water is also small in the setting process, so that the thrust of the setting piston is limited in the setting process, and the setting effect can be ensured by adopting larger setting water pressure. In addition, when the salvageable bridge plug with the tubular connecting sleeve is used for setting, high-pressure water can enter the central hole in the lower portion of the bridge plug through the connecting sleeve, and the bridge plug setting is realized by suppressing pressure through the central hole of the bridge plug in the setting process, so that higher requirements are placed on sealing among the central tube, the rubber cylinder seat and the cone in the lower portion of the bridge plug, more sealing structures are required to be used, the structure of the salvageable bridge plug is complex, the manufacturing cost is high, and the working reliability is low.

SUMMERY OF THE UTILITY MODEL

The technical problem to be solved by the utility model is: the provided salvaging type bridge plug with the seal sending function has the advantages of simple structure, high reliability and the like, can be set by adopting smaller water pressure, and has good setting effect.

The technical scheme for solving the technical problem is as follows: a salvageable bridge plug with a seal sending function comprises a plugging device for sealing an annular space between a bridge plug main body and a sleeve, an anchoring device for clamping the bridge plug main body in the sleeve, and a sending and sealing device for driving the plugging device and the anchoring device to complete the setting action, wherein the sending and sealing device comprises an upper joint, an upper protective cap in threaded connection with the outer wall of the upper joint, an upper outer sleeve and a connecting sleeve in threaded connection with the inner wall of the upper joint, so that a setting hydraulic cylinder is formed in an annular space between the upper outer sleeve and the connecting sleeve, a setting piston and a push cylinder for transmitting the thrust of the setting piston to the plugging device are arranged in the setting hydraulic cylinder, a setting shear pin is arranged between the upper outer sleeve and the push cylinder, the connecting sleeve is a solid stepped reducing connecting sleeve with a thin upper part and a thick lower part, the upper end of the connecting sleeve is provided with an axial liquid guiding blind hole, and the wall of the liquid guiding blind hole is provided with a liquid inlet hole for conveying the setting high-pressure water into the setting hydraulic cylinder.

As a further improvement of the utility model: the anchoring device comprises an upper cone and a lower cone, a plurality of slips are arranged between the upper cone and the lower cone, a slip outer sleeve is arranged outside each slip, and an upper slip reset spring and a lower slip reset spring are arranged between each slip and the slip outer sleeve.

As a further improvement of the utility model: the plugging device comprises a fishing head and an inner central tube connected with the fishing head, wherein an outer central tube is sleeved outside an inner central tube, a rubber tube upper pressing ring, a rubber tube base and a rubber tube lower pressing ring are sleeved on the outer central tube, a rubber tube assembly is sleeved on the rubber tube base, and a stepping locking spring is arranged between the rubber tube base and the outer central tube.

As a further improvement of the utility model: the lower end of the outer central tube is connected with the lower cone through external threads, and a plurality of axial collapse joints which are arranged at equal angles are arranged at the external threads at the lower end of the outer central tube.

As a further improvement of the utility model: the upper end surface of the setting piston is provided with a ring groove which enables the setting high-pressure water entering the setting hydraulic cylinder from the liquid inlet hole to act on the upper end surface of the setting piston.

As a further improvement of the utility model: the lower end of the connecting sleeve is provided with an axial fishing head accommodating blind hole.

Has the advantages that: the utility model discloses a can drag for formula bridging plug with send and seal function, owing to adopted the thin, thick solid core ladder reducing adapter sleeve in lower part in upper portion, be equipped with axial drain blind hole in the upper end of adapter sleeve, be equipped with on drain blind hole wall and carry the seat high pressure water to the technical characteristic who sits the feed liquor hole in the seal hydraulic cylinder, make the utility model discloses a can drag for formula bridging plug with send and seal the function and sit when sealing, the center tube part below the adapter sleeve can not bear the seat and seal liquid pressure, consequently, the seal structure of the following part of adapter sleeve is simpler than can drag for formula bridging plug among the prior art relatively, because simple structure, part are less for the reliability of bridging plug is higher, and the adapter sleeve that adopts this kind of structure can increase and sit and seal piston end face area, thereby adopts less water pressure just to sit and seal, and sits effectually sealed. Because the technical characteristics that an upper slip reset spring and a lower slip reset spring are arranged between each slip and the slip outer sleeve are adopted, the slips are not prone to tilting and have better reset effect in the deblocking process, and the phenomenon that the slips and the sleeve are blocked in the deblocking process can be effectively prevented. Because adopted plugging device includes the fishing head, with the interior center tube of fishing head connection, the cover is equipped with outer center tube in the center section of thick bamboo outside, and the cover is equipped with clamping ring, packing element seat, packing element lower clamping ring on the packing element on outer center tube, and the cover is equipped with the packing element subassembly on the packing element seat, is equipped with the technical characterstic of step-by-step lock spring between packing element seat and outer center tube, can prevent to sit and seal in-process and sit and seal back packing element resilience or packing element not hard up, makes to sit and seal more firmly. Because the lower end of the outer central tube is connected with the lower cone through the external thread, the external thread at the lower end of the outer central tube is provided with a plurality of axial collapse seams arranged at equal angles, during the unsealing process, the internal support at the lower end of the outer central tube is lost after the inner central tube is lifted, and the radial collapse is generated after the internal thread at the lower end of the outer central tube is stressed when the outer central tube is lifted, so that the outer central tube can be quickly separated from the lower cone, the clamping of the anchoring device is prevented, and the success rate of the unsealing is improved. Owing to adopted the up end of setting the piston to be equipped with the technical characteristic that makes the setting water under high pressure act on the annular on setting the piston up end by the feed liquor hole entering into the setting hydraulic cylinder, the up end that makes the setting piston can paste the lower terminal surface installation of tight top connection, and can not influence the start-up of setting the piston when setting, makes the utility model discloses a can drag for formula bridging plug with send and seal the function more compact structure. The technical characteristic that the axial fishing head containing blind hole is arranged at the lower end of the connecting sleeve is adopted, so that the length of the bridge plug feeding and sealing device can be effectively reduced while the setting liquid is prevented from entering the central pipe, the manufacturing cost is saved, and the construction operation is more convenient.

Drawings

The following describes the fishing type bridge plug with seal sending function in detail with reference to the accompanying drawings.

Fig. 1 is a schematic axial sectional structure diagram of the fishing type bridge plug with a seal sending function of the present invention;

FIG. 2 is a radial cross-sectional view of the external thread portion at the lower end of the outer central tube in the retrievable bridge plug with a seal delivery function of the present invention;

FIG. 3 is a schematic view of the axial cross-section structure of the landing plug with seal delivery function separated from the seal delivery device after the landing;

fig. 4 is a schematic view of the axial section structure of the fishable bridge plug with seal sending function after complete unsealing.

Detailed Description

As shown in fig. 1, the utility model discloses a can drag for formula bridging plug with send and seal function, include with the bridging plug main part and the sheathed tube annular space confined plugging device, with bridging plug main part card solid the anchor device in the sheathed tube to and drive plugging device and anchor device accomplish the device of sending that sets the action.

The sending and sealing device comprises an upper joint 1, an upper protective cap 2 and an upper outer sleeve 3 which are in threaded connection with the outer wall of the upper joint, a connecting sleeve 6 in threaded connection with the inner wall of the upper joint, so that a setting hydraulic cylinder is formed in an annular space between the upper outer sleeve and the connecting sleeve, a setting piston 4 and a push cylinder 5 for transmitting the thrust of the setting piston to the plugging device are arranged in the setting hydraulic cylinder, a setting shear pin 27 is arranged between the upper outer sleeve and the push cylinder, the connecting sleeve is a solid stepped reducing connecting sleeve with a thin upper part and a thick lower part, the upper end of the connecting sleeve is provided with an axial liquid guiding blind hole 31, the lower end of the connecting sleeve is provided with an axial fishing head accommodating blind hole 28, the wall of the liquid guide blind hole is provided with a liquid inlet hole 30 for conveying the setting high-pressure water into the setting hydraulic cylinder, and the upper end surface of the setting piston is provided with a ring groove 29 for enabling the setting high-pressure water entering the setting hydraulic cylinder from the liquid inlet hole to act on the upper end surface of the setting piston.

Plugging device is including fishing for head 7, with the interior center tube 14 of fishing for the head and being connected, and including center tube outside cover be equipped with outer center tube 13, on the center tube cover be equipped with on the packing element clamping ring 8, packing element seat 9, packing element clamping ring 15 down, the cover is equipped with the packing element subassembly on the packing element seat, the packing element subassembly includes two end packing elements 10 and a middle packing element 11, is equipped with spacer ring 12 between end packing element and middle packing element, is equipped with step-by-step locking spring 16 between packing element seat and outer center tube. The inner wall of the rubber cylinder seat, the inner wall of the inner central tube, the outer wall of the inner central tube and the inner wall of the outer central tube are provided with annular shoulder structures which can enable the outer central tube, the inner central tube and the rubber cylinder seat to be sequentially hung. A complete setting shear pin 26 is arranged between the connecting sleeve and the outer central pipe, and a deblocking shear pin 25 is arranged between the outer central pipe and the inner central pipe.

The anchoring device comprises an upper cone 17 and a lower cone 21, a plurality of slips 19 are arranged between the upper cone and the lower cone, a slip outer sleeve 18 is arranged outside each slip, an upper slip reset spring and a lower slip reset spring 20 are arranged between each slip and the slip outer sleeve, a lower protective cap 22 is arranged below each slip outer sleeve, a bottom plug 23 for sealing the lower end of a central hole of the bridge plug is arranged at the lower end of the lower cone, and the lower end of an outer central pipe is connected with the lower cone through external threads.

As shown in fig. 2, a plurality of longitudinal collapse slits 24 arranged at equal angles are formed at the external thread connecting the lower end of the outer central tube and the lower cone.

The utility model discloses a can drag for seat of formula bridging plug and seal in-process with send and seal the function: when the oil pipe is pressurized, setting high-pressure water enters the setting hydraulic cylinder through the liquid inlet hole to push the setting piston, when the pressure reaches 5-6MPa, the setting shear pin is cut off, the setting piston moves downwards, the push cylinder pushes the rubber cylinder upper press ring, the rubber cylinder seat and the upper cone to move downwards, and the slips are expanded and anchored on the inner wall of the sleeve. And the anchoring back setting piston continues to move downwards, the rubber cylinder upper pressure ring and the rubber cylinder seat move downwards to enable the rubber cylinder to generate radial expansion, and the annular space of the oil sleeve is sealed. When the pressure is continuously increased to a certain pressure, the setting shear pin is completely sheared off, and the oil pipe lifting and conveying device is separated from the plugging device. The set state is shown in figure 3.

The utility model discloses a can drag for deblocking in-process of formula bridging plug with send and seal function: the fishing head is fished by a fishing device, the inner central pipe is lifted, the inner central pipe loses the support of the lower end of the outer central pipe, when the inner central pipe is continuously lifted after being hung on the outer central pipe, the lower end of the outer central pipe is separated from the lower cone, the outer central pipe is continuously lifted after being hung on the rubber cylinder base, the rubber cylinder base moves upwards to enable the rubber cylinder to form a rebound distance, the rubber cylinder rebounds and is unlocked, and the slips are restored and unlocked under the action of the reset spring. The unsealed state is shown in FIG. 4.

Claims

1. The utility model provides a can drag for formula bridging plug with send and seal function, includes the plugging device that closes the annular space between bridging plug main part and the sleeve pipe, with the anchoring device of bridging plug main part card solid in the sleeve pipe to and drive plugging device and anchoring device and accomplish the send the sealing device of setting action, characterized by: the device comprises an upper joint, an upper protective cap, an upper outer sleeve and a connecting sleeve, wherein the upper protective cap is in threaded connection with the outer wall of the upper joint, the connecting sleeve is in threaded connection with the inner wall of the upper joint, a setting hydraulic cylinder is formed in an annular space between the upper outer sleeve and the connecting sleeve, a setting piston and a pushing cylinder for conveying the thrust of the setting piston to a plugging device are arranged in the setting hydraulic cylinder, a setting shear pin is arranged between the upper outer sleeve and the pushing cylinder, the connecting sleeve is a solid core stepped variable-diameter connecting sleeve with a thin upper part and a thick lower part, an axial liquid guiding blind hole is arranged at the upper end of the connecting sleeve, and a liquid inlet hole for conveying setting high-pressure water into the setting hydraulic cylinder is.

2. The bailable bridge plug with send and seal function of claim 1, wherein: the anchoring device comprises an upper cone and a lower cone, a plurality of slips are arranged between the upper cone and the lower cone, a slip outer sleeve is arranged outside each slip, and an upper slip reset spring and a lower slip reset spring are arranged between each slip and the slip outer sleeve.

3. The bailable bridge plug with send and seal function of claim 1, wherein: the plugging device comprises a fishing head and an inner central tube connected with the fishing head, wherein an outer central tube is sleeved outside an inner central tube, a rubber tube upper pressing ring, a rubber tube base and a rubber tube lower pressing ring are sleeved on the outer central tube, a rubber tube assembly is sleeved on the rubber tube base, and a stepping locking spring is arranged between the rubber tube base and the outer central tube.

4. A retrievable bridge plug with a send seal function as claimed in claim 3, wherein: the lower end of the outer central tube is connected with the lower cone through external threads, and a plurality of axial collapse joints which are arranged at equal angles are arranged at the external threads at the lower end of the outer central tube.

5. The bailable bridge plug with send and seal function of claim 1, wherein: the upper end surface of the setting piston is provided with a ring groove which enables the setting high-pressure water entering the setting hydraulic cylinder from the liquid inlet hole to act on the upper end surface of the setting piston.

6. A bailable bridge plug with a send seal function according to any one of claims 1 to 5, wherein: the lower end of the connecting sleeve is provided with an axial fishing head accommodating blind hole.