A bridge plug setting tool

Abstract

This utility model proposes a bridge plug setting tool, belonging to the field of oil extraction. It solves the problems of unstable setting, low pressure transmission efficiency, poor stroke control accuracy, complex operation, and easy failure under high pressure and high temperature environments found in existing setting tools. It includes a central tube, a limiting cap, a setting piston, and a pressure guiding cylinder. The central tube has a flow channel inside, and a limiting boss is provided on its side wall. The setting piston is slidably sleeved on the outside of the central tube, located below the limiting boss. The pressure guiding cylinder is sleeved on the outside of the setting piston, and its inner wall is slidably connected to the outer wall of the limiting boss. The upper end of the pressure guiding cylinder is connected to the limiting cap, located above the limiting boss. The central tube, setting piston, pressure guiding cylinder, and limiting boss together form a hydraulic chamber, which communicates with the flow channel through a channel. It is mainly used for bridge plug setting.

Description

Technical Field

[0001] This utility model belongs to the field of oil extraction, and in particular relates to a bridge plug setting tool. Background Technology

[0002] In oil extraction, effective plugging of the lower oil or bottom water layers in oil and water wells is crucial for ensuring extraction efficiency and safety. Traditional bridge plug setting tools have several shortcomings: some setting tools have low pressure transmission efficiency, resulting in insufficient setting force, unstable bridge plug anchoring, and a tendency to loosen and shift; some setting tools have poor stroke control precision and inconsistent setting action, which may lead to insufficient sealing of the rubber sleeve or insufficient clamping force of the slips, affecting the plugging effect; and some setting tools have poor compatibility with bridge plugs, are complex to operate, and increase operation time and labor costs.

[0003] Furthermore, traditional setting tools are prone to component wear or functional failure in high-pressure, high-temperature downhole environments, leading to setting failure and requiring secondary well workover operations, further increasing extraction costs. Therefore, developing a drillable bridge plug setting tool that features efficient pressure transmission, precise stroke control, stable and reliable structure, and convenient operation is of significant practical importance. Utility Model Content

[0004] In view of this, the present invention aims to propose a bridge plug setting tool to solve the technical problems of existing setting tools, such as unstable setting, low pressure transmission efficiency, poor stroke control accuracy, complex operation, and easy failure under high pressure and high temperature environment, so as to ensure that the bridge plug achieves accurate and reliable setting downhole.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a bridge plug setting tool, comprising a central tube, a limiting cap, a setting piston, and a pressure guiding cylinder. The central tube has a flow channel inside, and a limiting boss is provided on the side wall of the central tube. The setting piston is slidably sleeved on the outside of the central tube, and the setting piston is located below the limiting boss. The pressure guiding cylinder is sleeved on the outside of the setting piston, and the inner wall of the pressure guiding cylinder is slidably connected to the outer wall of the limiting boss. The upper end of the pressure guiding cylinder is connected to the limiting cap, and the limiting cap is located above the limiting boss. The central tube, setting piston, pressure guiding cylinder, and limiting boss together form a hydraulic cavity, which is connected to the flow channel through a channel.

[0006] Furthermore, the limiting cap is slidably sleeved on the outside of the central tube.

[0007] Furthermore, the lower end of the central tube is connected to a bridge plug, and the upper end of the central tube is connected to a tubular column.

[0008] Furthermore, both the upper and lower ends of the central tube are provided with threads, and the central tube is connected to the tube column and bridge plug through the threads at the upper and lower ends.

[0009] Furthermore, the seated piston is provided with a hydraulic groove, which is connected to the hydraulic chamber.

[0010] Furthermore, a sealing ring is provided on the inner side of the setting piston.

[0011] Furthermore, a sealing ring is provided on the outer side of the setting piston.

[0012] Furthermore, a sealing ring is provided on the outer wall of the limiting boss.

[0013] Furthermore, the pressure guide cylinder is provided with an exhaust port.

[0014] Furthermore, the pressure guide cylinder is threadedly connected to the limiting cap.

[0015] Compared with the prior art, the beneficial effects of this utility model are: This utility model provides a bridge plug setting tool, which precisely controls the stroke of the setting piston through the limiting cap, ensuring the consistency of the setting action, avoiding insufficient or excessive setting due to stroke deviation, and making the clamping force of the bridge plug and the sealing effect of the rubber sleeve stable and reliable.

[0016] This invention features highly efficient pressure transmission. The pressure guide cylinder, in conjunction with the setting piston, can efficiently convert the pressure medium in the oil pipe into setting force, ensuring that the setting pin of the bridge plug is precisely sheared. At the same time, it ensures that the slips are fully expanded and the rubber sleeve is effectively expanded, thereby improving the anchoring and sealing performance of the bridge plug.

[0017] This utility model has a stable structure and strong adaptability. All components are made of 35CrMo alloy steel, which can adapt to the high temperature environment of 150℃ and high pressure conditions downhole. The threaded connection design of the central tube and the bridge plug makes it compatible with various types of drillable bridge plugs, improving the versatility of the tool.

[0018] This invention is convenient and efficient to operate. The connection between the tool and the bridge plug and the setting process are simple to operate. The setting can be completed by controlling the pressure inside the oil pipe, which reduces the operation steps and time, and reduces labor costs and operation risks. Attached Figure Description

[0019] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0020] Figure 1 This is a half-sectional structural diagram of a bridge plug setting tool according to the present invention;

[0021] Figure 2 This is a schematic diagram of the bridge plug setting tool and the bridge plug connection structure described in this utility model.

[0022] In the picture:

[0023] 1-Central tube, 2-Limit cap, 3-Setting piston, 4-Pressure guide cylinder. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present utility model can be combined with each other, and the described embodiments are only some embodiments of the present utility model, not all embodiments.

[0025] See Figure 1-2 This embodiment describes a bridge plug setting tool, which includes a central tube 1, a limiting cap 2, a setting piston 3, and a pressure guiding cylinder 4. The central tube 1 has a flow channel inside, and a limiting boss is provided on the side wall of the central tube 1. The setting piston 3 is slidably sleeved on the outside of the central tube 1, and the setting piston 3 is located below the limiting boss. The pressure guiding cylinder 4 is sleeved on the outside of the setting piston 3, and the inner wall of the pressure guiding cylinder 4 is slidably connected to the outer wall of the limiting boss. The upper end of the pressure guiding cylinder 4 is connected to the limiting cap 2, and the limiting cap 2 is located above the limiting boss. The central tube 1, the setting piston 3, the pressure guiding cylinder 4, and the limiting boss together form a hydraulic cavity, and the hydraulic cavity communicates with the flow channel through a channel.

[0026] In this embodiment, the limiting cap 2 is slidably sleeved on the outside of the central tube 1. The lower end of the central tube 1 is connected to a bridge plug, and the upper end of the central tube 1 is connected to a tubing column. Both ends of the central tube 1 are threaded, and the central tube 1 is connected to the tubing column and the bridge plug through the threads at both ends. The setting piston 3 has a hydraulic groove, which communicates with the hydraulic chamber. Sealing rings are provided on the inner and outer sides of the setting piston 3 and on the outer wall of the limiting boss. The pressure guiding cylinder 4 has an exhaust hole, and the pressure guiding cylinder 4 is threadedly connected to the limiting cap 2.

[0027] The central tube 1 serves as the core support and power transmission component of the setting tool. One end of it is connected to the central tube of the bridge plug via a thread to efficiently transmit pressure and power to the bridge plug; the other end can be connected to the tubing string to enable the tool to be lowered and operated.

[0028] The limit cap 2 passes through the central tube 1 and is connected to the pressure guide cylinder 4 by threads. It is used to precisely limit the stroke range of the setting piston, ensure the consistency and accuracy of the setting action, and avoid damage to the bridge plug component due to excessive piston movement.

[0029] The setting piston 3 is sleeved on the outside of the central tube 1 and can slide along the axial direction of the central tube 1. Driven by the hydraulic pressure of the well, the setting piston can generate axial thrust, push the pressure guide cylinder 4 to move, and thus drive the setting sleeve of the bridge plug to move.

[0030] The pressure guide cylinder 4 is fitted on the outside of the setting piston 3, and its interior is connected to the oil pipe. It is used to accurately transmit the pressure medium in the oil pipe to the setting piston 3, control the movement rhythm and force of the setting piston 3, and realize the effective transmission of pressure.

[0031] The central tube 1 passes through the central hole of the limiting cap 2, the setting piston 3, and the pressure guiding cylinder 4. The limiting cap 2 is fixed to the upper end of the pressure guiding cylinder 4 by threads, and limits the downward limit position of the setting piston 3 by cooperating with the limiting boss. The setting piston 3 is located between the central tube 1 and the pressure guiding cylinder 4, and is located below the limiting boss. Its inner side is in sliding cooperation with the central tube 1, and its outer side is in contact with the pressure guiding cylinder 4. The lower end of the pressure guiding cylinder 4 cooperates with the setting sleeve of the bridge plug. The pressure guiding cylinder 4 can move in the opposite direction to the central tube 1 under the push of the setting piston 3.

[0032] During operation, the lower end of the center tube 1 of the setting tool is connected to the bridge plug and lowered to the predetermined downhole depth along with the tubing string. Pressure is applied to the tool through the tubing, with a pressure range of 18-20 MPa. The pressure medium flows into the hydraulic chamber through the orifice of the center tube 1. Under pressure, the setting piston 3 experiences a downward thrust, and the pressure guide cylinder 4 moves downward relative to the center tube under the force of the setting piston 3. Simultaneously, the center tube moves upward relative to the pressure guide cylinder under the pulling force of the external tubing string; the two movements are in opposite directions. This reverse movement, through the threaded connection between the center tube 1 and the bridge plug center tube, is converted into a pulling force on the bridge plug center tube and a thrust on the bridge plug setting sleeve. This force is sufficient to shear off the bridge plug setting pin. Subsequently, the upper and lower slips of the bridge plug are pushed into the upper and lower cones respectively and spread out, firmly gripping the inner wall of the casing. At the same time, the side and middle rubber sleeves are compressed and expanded under pressure, tightly fitting against the inner wall of the casing to achieve a seal. The locking ring engages and locks with the serrated teeth of the bridge plug's central tube, completing the setting process of the bridge plug. After setting is completed, rotating the tubing string in the forward direction will separate the setting tool from the bridge plug. After the tubing string is pulled out, the bridge plug remains securely in the well.

[0033] Before operation, check the integrity and flexibility of each component of the setting tool to ensure that the central tube 1, limit cap 2, setting piston 3, and pressure guide cylinder 4 are undamaged and free from jamming. Securely connect one end of the central tube 1 of the setting tool to the central tube of the bridge plug using threads, ensuring a tight and secure connection; connect the other end to the external tubing column to ensure the overall structural stability.

[0034] The operating string slowly lowers the bridge plug, connected to the setting tool, to the predetermined setting depth downhole. During the lowering process, the lowering speed is strictly controlled to be less than 2.5 meters per minute to prevent excessive instantaneous impact force from the hydrostatic column from causing premature shearing of the bridge plug setting pin, resulting in accidental setting midway.

[0035] Once the bridge plug reaches the predetermined depth, pressure is slowly and evenly applied into the setting tool through the tubing, raising the pressure to 18-20 MPa. During this process, the pressure change curve and tubing response are closely monitored to ensure stable pressure transmission. The pressure medium flows through the central tube 1 and into the hydraulic chamber via the orifice, pushing the setting piston 3 and the pressure guide cylinder 4 in opposite directions. The resulting force shears off the bridge plug setting pin, causing the bridge plug slips to open, the rubber sleeve to expand, and locking. After setting, the tubing is slightly lifted, and the setting effect is verified by observing changes in tubing resistance and pressure feedback. Once the bridge plug is confirmed to be firmly set, the tubing is rotated clockwise to separate the setting tool from the bridge plug. The tubing is then removed, completing the setting operation.

[0036] Before using the tool, a pressure test must be performed to ensure that all components function properly under a pressure of 18-20 MPa. During the lowering process, avoid violent shaking of the tubing string to prevent damage to the connection between the tool and the bridge plug. During the setting operation, the pressure must be increased slowly to avoid sudden high pressure causing impact damage to the tool and bridge plug.

[0037] The specific embodiments of this utility model disclosed above are merely illustrative of the present utility model. These specific embodiments do not exhaustively describe all details, nor do they limit the utility model to only the described embodiments. Many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it.

Claims

1. A bridge plug setting tool, characterized in that: It includes a central tube (1), a limiting cap (2), a setting piston (3), and a pressure guiding cylinder (4). The central tube (1) has a flow channel inside. A limiting boss is provided on the side wall of the central tube (1). The setting piston (3) is slidably sleeved on the outside of the central tube (1). The setting piston (3) is located below the limiting boss. The pressure guiding cylinder (4) is sleeved on the outside of the setting piston (3). The inner wall of the pressure guiding cylinder (4) is slidably connected to the outer wall of the limiting boss. The upper end of the pressure guiding cylinder (4) is connected to the limiting cap (2). The limiting cap (2) is located above the limiting boss. The central tube (1), the setting piston (3), the pressure guiding cylinder (4), and the limiting boss together form a hydraulic cavity. The hydraulic cavity is connected to the flow channel through a hole.

2. The bridge plug setting tool according to claim 1, characterized in that: The limiting cap (2) is slidably sleeved on the outside of the central tube (1).

3. The bridge plug setting tool according to claim 1, characterized in that: The lower end of the central tube (1) is connected to a bridge plug, and the upper end of the central tube (1) is connected to a tubular column.

4. The bridge plug setting tool according to claim 3, characterized in that: The central tube (1) is threaded at both the upper and lower ends, and the central tube (1) is connected to the pipe column and bridge plug through the threads at both the upper and lower ends.

5. The bridge plug setting tool according to claim 1, characterized in that: The seat piston (3) has a hydraulic groove, which is connected to the hydraulic chamber.

6. The bridge plug setting tool according to claim 1, characterized in that: A sealing ring is provided on the inner side of the setting piston (3).

7. The bridge plug setting tool according to claim 1, characterized in that: A sealing ring is provided on the outer side of the seated piston (3).

8. A bridge plug setting tool according to claim 1, characterized in that: A sealing ring is provided on the outer wall of the limiting boss.

9. A bridge plug setting tool according to claim 1, characterized in that: The pressure guide cylinder (4) has an exhaust hole.

10. A bridge plug setting tool according to claim 1, characterized in that: The pressure guide cylinder (4) is threadedly connected to the limiting cap (2).

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