A wellbore casing seat slurry internal packoff device

Abstract

The utility model relates to the technical field of plugging device, concretely is a kind of well circle seat mortar inner plugging device, including and the shape of well wall inner mouth compatible support ring, support ring is annular, detachably connected with plugging air bag on the outer ring surface of support ring, plugging air bag is annular, plugging air bag is used to and well wall is pasted to prevent mortar leakage.The utility model utilizes annular support ring and plugging air bag to carry out plugging to the mortar between well circle and well wall, by inflating plugging air bag, air bag can fill the gap between support ring and well wall, to avoid mortar to slide down to well along well wall inner side, make seat mortar more compact, make the connection between well circle and well wall more closely, improve construction quality.

Description

Technical Field

[0001] This utility model relates to the field of sealing device technology, specifically a well ring seat slurry internal sealing device. Background Technology

[0002] In many fields involving downhole operations, such as oil and gas extraction and groundwater resource protection, the sealing of the well casing is crucial. As a key transitional area connecting different structural layers within the well or between the wellbore and the formation, the sealing performance of the well casing directly affects the safety, stability, and economic benefits of downhole operations.

[0003] In existing technologies, prefabricated well rings are typically used. After the well wall is constructed, the well ring is placed on top of the well wall using mortar. However, since the inner opening of the well ring is generally smaller than the inner opening of the well wall, workers cannot directly seal and smooth the gap between the well wall and the well ring on the ground during grouting. They need to enter the well to perform a finishing operation to prevent mortar from being squeezed into the well during installation, resulting in an incomplete grouting and affecting the connection and compressive strength between the well ring and the well wall. Furthermore, if the well is deep, workers need to operate while suspended in mid-air or with one hand, making construction difficult and time-consuming. To address these shortcomings, we propose a well ring grouting internal sealing device. Utility Model Content

[0004] The purpose of this invention is to provide a well seat slurry internal sealing device to solve the problems mentioned in the background art.

[0005] This utility model is achieved through the following technical solution: a well ring seat grout sealing device, including a support ring adapted to the shape of the inner opening of the well wall, the support ring being annular, and a sealing airbag being detachably connected to the outer ring surface of the support ring, the sealing airbag being annular, the sealing airbag being used to fit against the well wall to prevent grout leakage.

[0006] Optionally, the inner ring surface of the support ring is detachably connected to two connecting seats. The support ring is composed of two semi-circular support plates. The connecting seats are detachably connected to the junction of the two support plates by bolts, and the support plates can rotate around the bolts.

[0007] Optionally, a hook is rotatably connected to the connecting seat via a rotating shaft. The side projection shape of the hook is U-shaped. The spacing between the upper and lower side walls of the hook is adapted to the thickness of the well ring. The hook is used to suspend the support ring on the well ring.

[0008] Optionally, a control handle is fixedly provided at the same end of both support plates near the connecting seat. The two control handles at the same end are symmetrically distributed from left to right. The control handles are used to open the two support plates to form a support ring.

[0009] Optionally, the two control handles located at the same end of the two support plates are connected by a limiting groove, and the control handles are provided with spring ropes for the limiting grooves to be wound around; when the two support plates cooperate to form an annular support ring, the spring ropes are in a stretched state, and the height of the control handles is higher than the height of the bolts.

[0010] Optionally, a connecting washer is fixedly provided on the inner annular surface of the sealing airbag opposite the position of the bolt. The connecting washer is used for the bolt to be inserted to connect the sealing airbag and the support ring. The sealing airbag has an air port, which passes through one of the support plates and extends into the inner side of the support ring.

[0011] Compared with the prior art, this utility model provides a well seat slurry internal sealing device, which has the following beneficial effects:

[0012] 1. This utility model utilizes an annular support ring and a sealing airbag to seal the mortar between the well ring and the well wall. By inflating the sealing airbag, the airbag can fill the gap between the support ring and the well wall, thereby preventing the mortar from sliding down the inner side of the well wall into the well, making the mortar more compact, making the connection between the well ring and the well wall tighter, and improving the construction quality.

[0013] 2. This utility model uses hooks to suspend the device on the well ring, and uses control handles to control the opening or closing of the support ring, allowing workers to complete the installation of the device on the ground and inflate the airbag through the air inlet on the ground, without the need for workers to enter the well, making the construction process more convenient and faster, and improving safety. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the sealing airbag structure of this utility model;

[0016] Figure 3 This is a schematic diagram of the support ring, connecting seat, hook, control handle and spring rope structure of this utility model;

[0017] Figure 4 This is a schematic diagram of the connecting seat and hook structure of this utility model;

[0018] Figure 5 This is a schematic diagram of the control handle structure of this utility model;

[0019] Figure 6 This is a schematic diagram of the structure of this utility model in use.

[0020] In the diagram: 1. Support ring; 101. Support plate; 2. Sealing airbag; 201. Connecting gasket; 202. Air port; 3. Connecting seat; 301. Bolt; 302. Rotating shaft; 4. Hook; 401. Anti-slip texture; 5. Control handle; 501. Limit groove; 502. Spring rope. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figure 1 - Figure 6 A well ring seat grout sealing device includes a support ring 1 adapted to the shape of the well wall's inner opening. The support ring 1 is annular, and a sealing airbag 2 is detachably connected to the outer annular surface of the support ring 1. The sealing airbag 2 is annular and is used to fit against the well wall to prevent grout leakage. After the support ring 1 and sealing airbag 2 enter the wellhead, inflation of the sealing airbag 2 allows it to fit against the annular inner opening of the well wall. The support ring 1 then supports the sealing airbag 2 against the well wall, improving stability and preventing grout from leaking into the wellhead from the gap between the well ring and the well wall, thus avoiding a loose connection between the well ring and the well wall.

[0023] Specifically, the inner ring surface of the support ring 1 is detachably connected to two connecting seats 3. The support ring 1 is composed of two semi-circular support plates 101. The connecting seats 3 are detachably connected to the junction of the two support plates 101 by bolts 301. Therefore, the same end of the two support plates 101 is connected together by the connecting seats 3.

[0024] Bolt 301 and connecting seat 3 are threaded together, and support plate 101 and bolt 301 are rotatably connected. Therefore, support plate 101 can rotate around bolt 301. When the two support plates 101 are flipped downwards around bolt 301 to overlap, the support ring 1 is crescent-shaped. The support plate 101 is made of steel sheet with good elasticity so that the device can overlap into a crescent shape when passing through the wellhead. It can also apply appropriate pressure to the support plate 101 to make it bend, so that the device can pass through the wellhead more easily.

[0025] Furthermore, a hook 4 is rotatably connected to the connecting seat 3 via a rotating shaft 302. The side projection of the hook 4 is U-shaped, and the spacing between the upper and lower side walls of the hook 4 is adapted to the thickness of the well ring. The hook 4 is used to suspend the support ring 1 on the well ring. This prevents the support ring 1 and the sealing airbag 2 from falling to the bottom of the well during use, facilitating operation by the staff.

[0026] Among them, such as Figure 4 As shown, the rotating shaft 302 is distributed horizontally, and the hook 4 can rotate up and down around the rotating shaft 302, so that the hook 4 is fitted on the inner ring surface of the well ring. The top wall and bottom of the hook 4 have several anti-slip textures 401 to increase the friction between the hook 4 and the well ring, making the hook 4 more stable in the suspension state, improving the overall stability of the device, and avoiding poor sealing effect caused by the movement of the device.

[0027] To enable the support ring 1 and the sealing airbag 2 to be expanded after entering the wellhead, control handles 5 are fixedly provided at the same end of both support plates 101 near the connecting seat 3. The control handles 5 are fixedly connected to the inner annular surface of the support plate 101, and the two control handles 5 at the same end are symmetrically distributed left and right. The control handles 5 are used to expand the two support plates 101 to form the support ring 1. This allows the operator to control the support plate 101 to rotate around the bolt 301 via the control handles 5, thereby changing the support ring 1 from a crescent shape to a circular shape. This eliminates the need for personnel to enter the well; operation can be performed from the surface, making the operation more convenient and faster.

[0028] Furthermore, the two control handles 5 located at the same end of the two support plates 101 are connected by a limiting groove 501. A spring rope 502 is provided on the control handle 5 for the limiting groove 501 to be wound around, so as to prevent the spring rope 502 from falling off and causing the connection between the two control handles 5 to break.

[0029] When the support ring 1 is in a ring shape, the position of the control handle 5 is higher than that of the bolt 301. During the opening and closing of the support plate 101, the distance between the two control handles 5 connected by the spring rope 502 is the largest when the control handle 5 is at the same height as the bolt 301. When the two support plates 101 are fully opened and form a circular plane, the distance between the control handles 5 decreases. Therefore, when the support ring 1 and the sealing airbag 2 are in a ring shape and supported on the well wall, the spring rope 502 is in a horizontally inward retracted state, that is, in a stretched state. At this time, the tension applied by the spring rope 502 to the control handle 5 can resist the horizontal outward tension that occurs when the left and right support plates 101 fall, ensuring that the left and right support plates 101 will not fall, further improving the stability of the device, and enabling the support ring 1 and the sealing airbag 2 to stably fit against the well wall, achieving the purpose of sealing.

[0030] It should be noted that a connecting washer 201 is fixedly installed on the inner annular surface of the sealing airbag 2, opposite the bolt 301. The connecting washer 201 is used for the bolt 301 to be inserted to connect the sealing airbag 2 and the support ring 1. Therefore, the support ring 1, the sealing airbag 2, the connecting seat 3, and the hook 4 can be connected as a whole for easy carrying. The connecting washer 201 and the sealing airbag 2 can be connected by means of bonding, rubber vulcanization molding, etc. The connecting washer 201 has a threaded hole for the bolt 301 to be threaded and fixed. The sealing airbag 2 has an air port 202, which passes through one of the support plates 101 and extends into the inside of the support ring 1. Therefore, the operator can connect an air guide pipe to the air port 202 and use an air inflator or other equipment on the ground to inflate or deflate the sealing airbag 2, so that the sealing airbag 2 fits against the well wall to achieve sealing, or can be removed from the well wall. The entire process does not require staff to enter the well, making construction more convenient and ensuring worker safety.

[0031] The working principle and usage process of this utility model are as follows: First, fold the support ring 1 into a crescent shape, hang the hook 4 at one end on the well ring, and squeeze and bend the support piece 101 to make the device pass through the well ring and be inserted into the well until the hook 4 at the other end is locked on the other side of the well ring. Then, pull the control handle 5 on the two support pieces 101 to open the two support pieces 101, forming a circular support ring 1, and use the spring rope 502 to keep the support ring 1 from falling.

[0032] Then, the sealing airbag 2 is inflated using an air inflator, so that the sealing airbag 2 expands and fits against the inner annular surface of the well wall, filling the gap between the support ring 1 and the well wall and well ring, ensuring that the mortar used for grouting will not be squeezed out in the well, avoiding the problem of insufficient mortar at the connection and subsequent sinking and shaking of the well ring.

[0033] After inflation is complete, the device appears as follows inside the well wall: Figure 6 As shown in the diagram, mortar is then filled into the gaps between the well ring and the top of the well to prevent it from falling into the well from the inside of the well wall. After the mortar hardens, the sealing airbag 2 is deflated, and the support ring 1 can be folded and removed to complete the construction.

[0034] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0035] Although embodiments of the present invention 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 to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A wellhead seat slurry internal sealing device, characterized in that: Comprises a support ring (1) adapted to the shape of the inner opening of the well wall, wherein the support ring (1) is annular, a blocking air bag (2) is detachably connected to the outer circumferential surface of the support ring (1), the blocking air bag (2) is annular, and the blocking air bag (2) is used for fitting with the well wall to prevent mortar leakage; Two connecting seats (3) are detachably connected to the inner circumferential surface of the support ring (1), the support ring (1) is composed of two semi-annular support pieces (101), the connecting seats (3) are detachably connected at the junction of the two support pieces (101) through bolts (301), and the support pieces (101) can rotate around the bolts (301).

2. The wellhead seat slurry plugging device according to claim 1, characterized in that: A hook (4) is rotatably connected to the connecting seat (3) through a rotating shaft (302), the side projection shape of the hook (4) is a U-shape, the distance between the upper and lower side walls of the hook (4) is adapted to the thickness of the well ring, and the hook (4) is used for suspending the support ring (1) on the well ring.

3. The wellhead seat slurry plugging device according to claim 2, characterized in that: A control handle (5) is fixedly arranged at the same end of the two support pieces (101) close to the connecting seat (3), the two control handles (5) at the same end are distributed symmetrically left and right, and the control handles (5) are used to expand the two support pieces (101) to form the support ring (1).

4. The wellhead seat slurry plugging device according to claim 3, characterized in that: The two control handles (5) at the same end of the two support pieces (101) are connected through a limiting groove (501), and a spring cord (502) for the limiting groove (501) to wind around is arranged on the control handle (5); when the two support pieces (101) cooperate with each other to form the annular support ring (1), the spring cord (502) is in a stretched state, and the height of the control handle (5) is higher than that of the bolt (301).

5. The wellhead seat slurry plugging device according to claim 1, characterized in that: A connecting gasket (201) is fixedly arranged at a position on the inner circumferential surface of the blocking air bag (2) facing the bolt (301), the connecting gasket (201) is used for the insertion of the bolt (301) to connect the blocking air bag (2) and the support ring (1), the blocking air bag (2) is provided with an air port (202), and the air port (202) penetrates through one of the support pieces (101) and extends into the inner side of the support ring (1).

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