Soluble blanking plug

Abstract

The soluble blanking plug comprises a body and a soluble plugging core arranged in an inner cavity of the body, a glass plate and a ceramic isolation plate are arranged at the positions, located on the two sides of the soluble plugging core, of the inner cavity of the body respectively, the glass plate is bonded to one side of the soluble plugging core through high-temperature glue, and a shear pin is further fixedly connected to the outer side of the body in a penetrating mode. The shear pin abuts against the outer side of the ceramic isolation plate. The use of the soluble blanking plug designed by the utility model can fully cover the field of drilling under pressure in an oil and gas field, and compared with the existing blanking plug, the soluble blanking plug can reduce the secondary blocking risk of a production pipe column and reduce the secondary development cost of an oil and gas well to the maximum extent.

Description

Technical Field

[0001] The utility model relates to the relevant field of plugging devices, and more specifically, to a soluble plugging device. Background Art

[0002] During the process of drilling oil and gas wells under pressure, a plugging device needs to be connected to the bottom of the first pipe string to prevent the bottom hole pressure from flowing out of the wellhead through the channel in the pipe string, causing a blowout accident. The existing plugging device plug is made of iron material, which sometimes carries the risk of being carried into the production pipe main by oil and gas, causing the channel to be blocked and unable to produce. In addition, it needs to be salvaged or drilled and ground, which is too expensive. Utility Model Content

[0003] 1. Technical issues to be solved

[0004] The purpose of the utility model is to provide a soluble plug to solve the related problems raised in the above background technology.

[0005] 2. Technical solution

[0006] A soluble plug comprises a main body and a soluble plugging core arranged in an inner cavity of the main body, wherein the inner cavity of the main body is provided with a glass plate and a ceramic isolation plate at both sides of the soluble plugging core, the glass plate is bonded to one side of the soluble plugging core by high-temperature glue, and the outer side of the main body is also fixedly connected with shear nails, and the shear nails abut against the outer side of the ceramic isolation plate.

[0007] Preferably, the inner cavities at the upper and lower ends of the main body are respectively provided with female threads and male threads.

[0008] Preferably, the soluble plugging core is made of magnesium-based soluble material.

[0009] Preferably, a shear nail sealing ring is sleeved and connected to the outer side of the body, the shear nail sealing ring is fixedly connected to the body by bolts, and the shear nail sealing ring is sleeved on the outer side of the shear nail.

[0010] Preferably, the contact surfaces of the soluble plugging core, the shear nail sealing ring, the ceramic isolation plate and the body are all provided with sealing pairs.

[0011] 3. Beneficial effects

[0012] Compared with the prior art, the advantages of the utility model are: the soluble plug designed by the utility model is connected to the bottom of the tubing, which can effectively isolate the pressure from the bottom of the well from gushing out of the wellhead and prevent blowout accidents. After the tubing is lowered to the designed depth, the pressure is built up from the channel inside the tubing, and the soluble plugging core of the plugger can be knocked down to the bottom of the well, so that the oil and gas production channel can be unblocked. The soluble plugging core will undergo a dissolution reaction with the formation water containing minerals at the bottom of the well, and will be discharged back out of the wellhead in the later blowout stage, which can minimize the risk of secondary blockage of the production tubing and reduce the secondary development costs of oil and gas wells. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the utility model;

[0014] Figure 2 It is a schematic diagram of the cross-sectional structure of the utility model.

[0015] Explanation of the numbers in the figure: 1-main body, 2-glass plate, 3-high temperature glue, 4-soluble plugging core, 5-sealing pair, 6-shear pin, 7-shear pin sealing ring, 8-ceramic isolation plate. DETAILED DESCRIPTION

[0016] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0017] In the description of the present invention, "plurality" means two or more than two, unless otherwise clearly and specifically defined.

[0018] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "set / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0019] See also Figure 1-2 A soluble plug includes a body 1 and a soluble plugging core 4 arranged in the inner cavity of the body 1. A glass plate 2 and a ceramic isolation plate 8 are respectively arranged on both sides of the soluble plugging core 4 in the inner cavity of the body 1. The glass plate 2 is bonded to one side of the soluble plugging core 4 by a high-temperature adhesive 3. A shear nail 6 is fixedly connected to the outer side of the body 1, and the shear nail 6 abuts against the outer side of the ceramic isolation plate 8. A shear nail sealing ring 7 is also sleeved and connected to the outer side of the body 1. The shear nail sealing ring 7 is fixedly connected to the body 1 by bolts, and the shear nail sealing ring 7 is sleeved on the outer side of the shear nail 6. The contact surfaces of the soluble plugging core 4, the shear nail sealing ring 7, the ceramic isolation plate 8 and the body 1 are all provided with a sealing pair 5.

[0020] in:

[0021] Body 1: The body is designed with threads connected to the pipe string, with a female thread at the upper end and a male thread at the lower end. The soluble plug is installed in the body and blocked by a step to prevent it from being pushed out of the wellhead during drilling.

[0022] Glass plate 2: The glass plate is installed on the upper end of the soluble plugging core. After being coated with high-temperature glue, it is pressed to expel the air inside the colloid to prevent the existence of gaps after the colloid solidifies.

[0023] High temperature glue 3: The high temperature glue is applied on the soluble plugging core to form an isolation film to prevent the leaked liquid from the pipe column from contacting the soluble plugging core, causing a dissolution reaction and leading to accidents.

[0024] Soluble plug 4: Made of magnesium-based soluble material, it is used to isolate the bottom hole pressure to prevent the pressure in the well from escaping to the wellhead during drilling, causing accidents. It will dissolve when in contact with water containing minerals.

[0025] Sealing pair 5: The sealing pair is installed on the parts to play a sealing and isolation role to prevent liquid or gas from passing through.

[0026] Shear pins 6: Prevent falling objects from knocking the soluble plug to the bottom of the well during the drilling process. When the plug needs to be knocked down, water pressure or air pressure is applied to the soluble plug, and the soluble plug moves downward to cut the shear pins.

[0027] Shear nail sealing ring 7: Make sure there is no cross-pressure hole on the periphery of the body to prevent the soluble plugger from being connected in the middle of the pipe string, making it impossible to pressure test the pipe string later.

[0028] Ceramic isolation plate 8: installed at the lower end of the soluble plugging core, it withstands the bottom hole pressure and cooperates with the sealing pair to isolate the contact between the liquid in the well and the soluble plugging core.

[0029] Based on the above structural design, the soluble plug is connected to the bottom of the pipe string, which can effectively isolate the pressure from the bottom of the well from gushing out of the wellhead and prevent blowout accidents. After the pipe string is lowered to the designed depth, the pressure is suppressed from the channel inside the pipe string, and the soluble plug of the plug can be knocked down to the bottom of the well, so that the oil and gas production channel can be unblocked. The soluble plug will dissolve and react with the formation water containing minerals at the bottom of the well, and will be discharged back out of the wellhead in the later blowout stage, which can minimize the risk of secondary blockage of the production pipe string and reduce the secondary development costs of oil and gas wells.

[0030] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A soluble plugging device, comprising a body (1) and a soluble plugging core (4) arranged in the inner cavity of the body (1), characterized in that: A glass plate (2) and a ceramic isolation plate (8) are respectively arranged on both sides of the soluble plugging core (4) in the inner cavity of the body (1); the glass plate (2) is bonded to one side of the soluble plugging core (4) by means of high-temperature glue (3); and a shear nail (6) is fixedly connected and penetrated through the outer side of the body (1), and the shear nail (6) abuts against the outer side of the ceramic isolation plate (8).

2. A soluble plug according to claim 1, characterized in that: The inner cavities at the upper and lower ends of the body (1) are respectively provided with female threads and male threads.

3. A soluble plug according to claim 1, characterized in that: The soluble plugging core (4) is made of magnesium-based soluble material.

4. A soluble plug according to claim 3, characterized in that: A shear nail sealing ring (7) is sleeved and connected to the outer side of the body (1); the shear nail sealing ring (7) is fixedly connected to the body (1) via bolts; the shear nail sealing ring (7) is sleeved on the outer side of the shear nail (6).

5. A soluble plug according to claim 4, characterized in that: The contact surfaces of the soluble plugging core (4), the shear nail sealing ring (7), the ceramic isolation plate (8) and the body (1) are all provided with sealing pairs (5).

Images