CN115949370A - Light ring type dissolvable bridge plug - Google Patents

Abstract

The invention discloses an aperture type dissolvable bridge plug, which belongs to the technical field of oil layer plugging equipment, and is sleeved on a tubular shaft, the tubular shaft is sleeved on a mandrel, the bridge plug comprises an upper pressing ring, an upper slip component, an upper slip pressing platform, a first pressing ring, an upper cone, an aperture structure, a lower cone, a second pressing ring, a lower slip pressing platform, a lower slip component, a lower pressing ring and a positioning pushing sleeve which are sequentially arranged, the upper cone is a hollow cone with a downward conical surface, the bottom of the upper cone extends into the aperture structure, the lower cone is a hollow cone with an upward conical surface, the top of the lower cone extends into the aperture structure, the aperture structure comprises a plurality of arc-shaped metal sheets which are sequentially overlapped, a pulley device is arranged in the middle of the inner wall of each arc-shaped metal sheet, and a sliding rail matched with the pulley device is arranged on the outer wall of the adjacent arc-shaped metal sheets. The diaphragm type dissolvable bridge plug with the structure realizes variable-diameter setting through the force application of the upper and lower cones to the diaphragm structure, and the blocking effect is stable and durable.

Description

An aperture type dissolvable bridge plug

technical field

The invention relates to the technical field of oil layer plugging equipment, in particular to an aperture type dissolvable bridge plug.

Background technique

In the exploration and production of oil fields, a temporary plugging process is needed to block the current production layer so as to facilitate the exploitation of other production layers. After the process is completed, contact temporary plugging to establish the connection between the production layer and the wellbore. The flow channel realizes the oil and gas production of oil and gas wells. Although the plugging technology of bridge plugs has been widely used in the process of development and reconstruction, there are the following technical problems in the bridge plugs. The plugging effect of the bridge plugs is unstable after the completion of the setting process and cannot be plugged In the current production layer, the bridge plug cannot play the role of plugging, so that the production cannot be carried out normally. At the same time, it is also found that the permanent bridge plug is not completely dissolved, and there are a lot of insoluble substances such as rubber, which need to be salvaged manually. Consumed time and manpower.

Contents of the invention

The purpose of the present invention is to provide an aperture-type dissolvable bridge plug, which realizes variable-diameter setting by applying force to the aperture structure from the upper and lower vertebral bodies, and the sealing effect is stable and long-lasting.

In order to achieve the above purpose, the present invention provides an aperture type dissolvable bridge plug, which is sleeved on the tube shaft, and the tube shaft is sleeved on the mandrel, and is characterized in that it includes an upper pressure ring, an upper clip The shoe assembly, the upper slip table, the first pressure ring, the upper cone, the aperture structure, the lower cone, the second pressure ring, the lower slip table, the lower slip assembly, the lower pressure ring and the positioning push sleeve, all The above-mentioned upper vertebral body is a hollow cone with the conical face facing down, the bottom of the upper vertebral body extends into the aperture structure, and the lower vertebral body is a hollow cone with the conical face facing upwards, and the bottom of the lower vertebral body The top protrudes into the aperture structure, and the aperture structure includes several arc-shaped metal sheets overlapped in sequence, a pulley device is arranged in the middle of the inner wall of the arc-shaped metal sheet, and a pulley device is arranged on the outer wall adjacent to the arc-shaped metal sheet. There are slide rails matched with the pulley assembly.

Preferably, the top of the upper pressure ring is provided with an extruding boss, the upper pressure ring is fixed on the top of the upper slip assembly, and the top of the upper slip pressing platform extends into the upper slip assembly between the tube axis.

Preferably, the positioning push sleeve is fixedly connected to the lower pressure ring, the lower pressure ring is fixedly connected to the lower slip assembly, and the bottom end of the lower slip pressing table extends into the lower slip assembly between the tube axis.

Preferably, the upper slip table is connected to the first pressure ring, the lower end surface of the first pressure ring is in contact with the upper end surface of the upper vertebral body, and the lower slip table is connected to the The second pressure ring is connected, and the upper end surface of the second pressure ring is in contact with the lower end surface of the lower vertebral body.

Preferably, the radius of the tube axis is smaller than the inner diameter of the lower end surface of the upper vertebral body and the inner diameter of the upper end surface of the lower vertebral body, and the inner diameter of the lower end surface of the upper vertebral body and the inner diameter of the upper end surface of the lower vertebral body are less than The initial state inner diameter of the aperture structure.

Preferably, the outermost end of the arc-shaped metal sheet is provided with a leak-proof rubber strip, and the leak-proof rubber strip is in contact with the outer wall of the adjacent arc-shaped metal sheet.

Preferably, thin metal sheets are respectively arranged at the center of the upper surface and the lower surface of the aperture structure.

Therefore, the present invention adopts a kind of aperture type dissolvable bridge plug with the above-mentioned structure. The upper and lower vertebral bodies are respectively pressed by the upper and lower slip assemblies. diameter, to achieve the setting effect, and its sealing effect is stable and long-lasting; and the overall use of dissolvable materials avoids the problem of incomplete dissolution of the existing permanent bridge plug and the need for manual salvage.

The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

Description of drawings

Fig. 1 is a schematic structural view of an embodiment of an aperture type dissolvable bridge plug of the present invention;

2 is a top view of the initial state of the aperture structure of the embodiment of the present invention;

Fig. 3 is a top view of the blocking state of the aperture structure of the embodiment of the present invention;

Fig. 4 is a schematic diagram of the outer wall structure of the arc-shaped metal sheet according to the embodiment of the present invention.

reference sign

1. Mandrel; 2. Tube shaft; 3. Extrusion boss; 4. Upper pressure ring; 5. Upper slip assembly; 6. Upper slip pressure table; 7. First pressure ring; 8. Upper vertebral body ;9. Aperture structure; 10. Arc-shaped metal sheet; 11. Lower vertebral body; 12. Second pressure ring; 13. Lower slip pressure platform; 14. Lower slip assembly; 15. Lower pressure ring; 16. Positioning Push tube; 17, slide rail; 18, leak-proof rubber strip; 19, metal sheet.

Detailed ways

The technical solutions of the present invention will be further described below through the accompanying drawings and embodiments.

Example

As shown in the figure, an aperture type dissolvable bridge plug is sheathed on the tube shaft 2 , and the tube shaft 2 is sleeved on the mandrel 1 . The bridge plug includes an upper pressure ring 4, an upper slip assembly 5, an upper slip pressure table 6, a first pressure ring 7, an upper cone 8, an aperture structure 9, a lower cone 11, a second pressure ring 12, The lower slip press table 13, the lower slip assembly 14, the lower pressure ring 15 and the positioning push sleeve 16.

The upper vertebral body 8, the lower vertebral body 11 and the aperture structure 9 are all made of dissolvable materials, but their corrosion resistance should be slightly higher than that of the bridge plug itself. The material of the pressing table 13 may be the same as or different from that of the existing slip pressing table. Among them, the first pressure ring 7 and the second pressure ring should be sufficient to support the pressure conduction between the slip pressure table and the cone, and require high strength.

The top of the upper pressure ring 4 is provided with an extruding boss 3 , the upper pressure ring 4 is fixed on the top of the upper slip assembly 5 , and the upper pressure ring 4 exerts force on the upper slip table 6 through the upper slip assembly 5 . Under the action of the axial force, the top end of the upper slip table 6 extends into the space between the upper slip assembly 5 and the tube shaft 2 to play the role of setting seal. The upper slip table 6 is connected with the first pressure ring 7, the lower end surface of the first pressure ring 7 is in contact with the upper end surface of the upper vertebral body 8, and the upper slip table 6 presses the upper vertebral body 8 through the first pressure ring 7 .

The positioning push sleeve 16 is fixedly connected with the lower pressure ring 15 , the lower pressure ring 15 is fixedly connected with the lower slip assembly 14 , and the bottom end of the lower slip pressing table 13 extends between the lower slip assembly 14 and the tubular shaft 2 . The lower slip press 13 is connected to the second press ring 12, the upper end surface of the second press ring 12 is in contact with the lower end surface of the lower vertebral body 11, and the lower slip press 13 presses the lower vertebral body 11 through the second press ring 12 . The first pressure ring 7 is in close contact with the upper vertebral body 8, and the second pressure ring 12 is in close contact with the lower vertebral body 11, and its function is to prevent the loss of the axial force on the bridge plug during transmission. The tight connection between the upper slip pressure table 6 and the first pressure ring 7 and the close connection between the lower slip pressure table 13 and the second pressure ring 12 is to prevent loss during axial force transmission. At the same time, the existence of the first pressure ring 7 and the second pressure ring 12 can prevent the metal friction between the upper and lower slip tables and the upper and lower vertebral bodies in direct contact, avoid material loss, and thus affect performance.

The upper vertebral body 8 is a hollow cone with the conical surface facing downwards, the bottom of the upper vertebral body 8 extends into the aperture structure 9, the lower vertebral body 11 is a hollow cone with the conical surface facing upwards, and the top of the lower vertebral body 11 extends into the aperture Inside structure 9. The degree of slope of the upper vertebral body 8 and the lower vertebral body 11 determines the movement time of the aperture structure 9 , the greater the slope of the slope, the faster the movement of the aperture structure 9 is completed. The radius of the tubular shaft 2 is smaller than the inner diameter of the lower end surface of the upper vertebral body 8 and the inner diameter of the upper end surface of the lower vertebral body 11, so that the upper vertebral body 8 and the lower vertebral body 11 can easily slide along the tubular shaft 2 under the action of axial force . The lower end surface of the upper vertebral body 8 and the upper end surface of the lower vertebral body 11 have a matching snap-in structure, so that the upper vertebral body 8 and the lower vertebral body 11 are locked after contact, which can prevent the upper and lower vertebral bodies from retreating so that the aperture structure 9 Retraction makes the blocking effect invalid.

The aperture structure 9 includes 15 arc-shaped metal sheets 10 overlapping one after another, the inner edges of the arc-shaped metal sheets 10 form an inner circular surface, and the outer edges of the arc-shaped metal sheets 10 form an outer circular surface. The thickness and quantity of the arc-shaped metal sheets 10 determine the expanded radius of the aperture structure 9 to a certain extent, which affects the sealing effect of the bridge plug, so it can be designed according to actual needs.

The middle part of the inner wall of the arc-shaped metal sheet 10 is provided with a pulley device, and the pulley device is perpendicular to the axial direction, and the outer wall of the adjacent arc-shaped metal sheet 10 is provided with a slide rail 17 matched with the pulley device. The pulley device and slide rail 17 can prevent the arc-shaped metal sheet 10 from falling off during the movement, resulting in failure of the sealing effect. By limiting the moving distance of the pulley device on the slide rail 17, the radius of the expanded outer circle of the aperture structure 9 can be changed, so it can be flexibly adjusted according to actual needs.

The inner diameter of the lower end surface of the upper vertebral body 8 and the inner diameter of the upper end surface of the lower vertebral body 11 are smaller than the inner diameter of the aperture structure 9 in the initial state. The upper and lower hollow circle surfaces of the aperture structure 9 are provided with thin metal sheets 19, which are used to fix the initial shape of the arc-shaped metal sheet 10 and prevent the upper and lower vertebral bodies from moving closer to the aperture structure 9 under axial force during the transportation of the bridge plug. , so that the aperture structure 9 is forced to expand outward in advance. The expanded part will affect the transportation of the bridge plug, and at the same time, it will increase the radius of the environment after the bridge plug is transported to the designated location, so as to prevent the aperture structure 9 from being unable to play the blocking role of the bridge plug after the outward movement under force is completed.

When the upper vertebral body 8 and the lower vertebral body 11 are respectively subjected to the axial force and move closer to the aperture structure 9, the metal sheet 19 is first crushed, and then the conical surfaces of the upper and lower vertebral bodies push the inner circular surface to expand outward, and the arc-shaped metal sheet 10 Forced motion, pulley device starts to move along slide rail 17, makes the outer edge of arc-shaped metal sheet 10 move from outside to inside along the outer wall of adjacent arc-shaped metal sheet 10, and the trajectory of each arc-shaped metal sheet 10 is same. Compared with the aperture structure 9 of the initial state, the aperture structure 9 of the blocked state finally formed has a reduced coverage area of the adjacent arc-shaped metal sheet 10, and the radius of the inner circular surface is the same as the radius of the upper end surface of the upper vertebral body 8 and the radius of the lower vertebral body. The lower end faces of the bodies 11 have the same radius.

The outermost end of the arc-shaped metal sheet 10 is provided with a leak-proof rubber strip 18 , and the leak-proof rubber strip 18 is in contact with the outer wall of the adjacent arc-shaped metal sheet 10 . The leak-proof rubber strip 18 covers the connection gap between the two arc-shaped metal sheets 10 to prevent the solution of the bridge plug in the working environment from leaking into the space between the outer wall and the inner wall of the adjacent arc-shaped metal sheets 10, causing the pulley device and the slide rail to leak. 17 There is sediment in the memory, or the aperture structure 9 is invalid due to early corrosion. After the aperture structure 9 enters the sealing state, the anti-leakage rubber strip 18 can seal the gap on the outer circular surface and strengthen the sealing effect of the bridge plug. Compared with the existing permanent bridge plug, only the insoluble matter of the leak-proof rubber strip 18 exists in the entire bridge plug structure, which reduces the amount of residue after the bridge plug dissolves, and is more conducive to the convenience of construction.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: it still Modifications or equivalent replacements can be made to the technical solutions of the present invention, and these modifications or equivalent replacements cannot make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present invention.

Claims (7)

1. A diaphragm-type dissolvable bridge plug, which is sleeved on a tube shaft, and the tube shaft is sleeved on a mandrel, and is characterized in that it includes an upper pressure ring, an upper slip assembly, and an upper slip pressure ring arranged in sequence. Platform, first pressure ring, upper cone, aperture structure, lower cone, second pressure ring, lower slip press table, lower slip assembly, lower pressure ring and positioning push sleeve, the upper cone is a conical surface Downward hollow cone, the bottom of the upper cone extends into the aperture structure, the lower cone is a hollow cone facing upward, and the top of the lower cone extends into the aperture structure Inside, the aperture structure includes a number of arc-shaped metal sheets overlapped one after another, a pulley device is provided on the middle part of the inner wall of the arc-shaped metal sheet, and a pulley device corresponding to the pulley device is arranged on the outer wall of the adjacent arc-shaped metal sheet. Fitting rails. 2. A diaphragm type dissolvable bridge plug according to claim 1, characterized in that: the top of the upper pressure ring is provided with an extrusion boss, and the upper pressure ring is fixed on the top of the upper slip assembly. The top end, the top end of the upper slip pressing table protrudes between the upper slip assembly and the pipe shaft. 3. A diaphragm type dissolvable bridge plug according to claim 2, characterized in that: the positioning push sleeve is fixedly connected to the lower pressure ring, and the lower pressure ring is fixedly connected to the lower slip assembly , the bottom end of the lower slip pressing table extends into between the lower slip assembly and the pipe shaft. 4. A diaphragm-type dissolvable bridge plug according to claim 3, characterized in that: the upper slip pressure table is connected to the first pressure ring, and the lower end surface of the first pressure ring is connected to the first pressure ring. The upper end surface of the upper vertebral body is in contact, the lower slip pressure table is connected with the second pressure ring, and the upper end surface of the second pressure ring is in contact with the lower end surface of the lower vertebral body. 5. A diaphragm type dissolvable bridge plug according to claim 4, characterized in that: the radius of the tube axis is smaller than the inner diameter of the lower end surface of the upper vertebral body and the inner diameter of the upper end surface of the lower vertebral body, so The inner diameter of the lower end surface of the upper pyramidal body and the inner diameter of the upper end surface of the lower pyramidal body are smaller than the inner diameter of the initial state of the aperture structure. 6. A diaphragm-type dissolvable bridge plug according to claim 1, characterized in that: the outermost end of the arc-shaped metal sheet is provided with a leak-proof rubber strip, and the leak-proof rubber strip is adjacent to the The outer walls of the arc-shaped metal sheets are in contact. 7 . The aperture-type dissolvable bridge plug according to claim 6 , wherein a thin metal sheet is respectively arranged in the center of the upper surface and the lower surface of the aperture structure. 8 .

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