CN115949370A

CN115949370A - Light ring type dissolvable bridge plug

Info

Publication number: CN115949370A
Application number: CN202310224632.5A
Authority: CN
Inventors: 刘宝胜; 刘文涛; 于硕; 卫嘉莉; 张跃忠
Original assignee: Taiyuan University of Science and Technology
Current assignee: Chengdu Yishenrui Technology Co ltd; XI'AN YUXING PETROLEUM MACHINERY OF NEW TECHNOLOGY DEVELOPMENT CO LTD
Priority date: 2023-03-10
Filing date: 2023-03-10
Publication date: 2023-04-11
Anticipated expiration: 2043-03-10
Also published as: CN115949370B

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

Light ring 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

A temporary plugging process is needed in exploration and exploitation of an oil field to plug a current production zone so as to implement exploitation of other production zones, and after the process is completed, the temporary plugging is contacted to establish a flow channel between the production zone and a shaft, so that oil extraction and gas production of an oil well and a gas well are realized. Although the plugging technology of the bridge plug is widely applied in the development and reconstruction processes, the bridge plug has the technical problems that the plugging effect of the bridge plug is unstable in the process after the setting is finished, the current production layer cannot be plugged, and the bridge plug cannot play a plugging role, so that the production cannot be normally carried out, and meanwhile, the phenomenon that the permanent bridge plug is incompletely dissolved, a large amount of insoluble substances such as rubber exist, and manual salvage is needed, so that the construction period and manpower are consumed.

Disclosure of Invention

The invention aims to provide an aperture type dissolvable bridge plug, which realizes variable-diameter setting by applying force to an aperture structure through upper and lower cones, and has stable and lasting plugging effect.

In order to achieve the purpose, the invention provides an aperture type dissolvable bridge plug which is sleeved on a tubular shaft, wherein the tubular shaft is sleeved on a mandrel, and the aperture type dissolvable bridge plug is characterized in that: including last clamping ring, last slips subassembly, last slips pressure platform, first clamping ring, go up centrum, aperture structure, centrum, second clamping ring, slips pressure platform, slips subassembly down, clamping ring and location push away the cover down in the last clamping ring that sets gradually, it is the hollow cone of conical surface down to go up the centrum, the bottom of going up the centrum stretches into in the aperture structure, the centrum is the hollow cone of conical surface up down, the top of centrum stretches into down in the aperture structure, the aperture structure includes a plurality of overlap joint's arc sheetmetal in proper order, the inner wall middle part of arc sheetmetal is provided with pulley gear, and is adjacent be provided with on the outer wall of arc sheetmetal with pulley gear matched with slide rail.

Preferably, the top of going up the clamping ring is provided with the extrusion boss, it fixes to go up the clamping ring go up the top of slips subassembly, the top of going up slips pressure table stretches into go up the slips subassembly with between the hollow shaft.

Preferably, the positioning push sleeve is fixedly connected with the lower pressing ring, the lower pressing ring is fixedly connected with the lower slip assembly, and the bottom end of the lower slip pressing table extends into the space between the lower slip assembly and the tubular shaft.

Preferably, go up the slips and press the platform with first clamping ring is connected, the lower terminal surface of first clamping ring with the up end of going up the centrum contacts, down the slips press the platform with the second clamping ring is connected, the up end of second clamping ring with the lower terminal surface of centrum contacts down.

Preferably, the radius of the tubular shaft is smaller than the inner diameter of the lower end face of the upper vertebral body and the inner diameter of the upper end face of the lower vertebral body, and the inner diameters of the lower end face of the upper vertebral body and the upper end face of the lower vertebral body are smaller than the inner diameter of the aperture structure in the initial state.

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

Preferably, the centers of the upper surface and the lower surface of the aperture structure are respectively provided with a metal sheet.

Therefore, the diaphragm type dissolvable bridge plug adopting the structure respectively presses the upper cone body and the lower cone body through the upper slip assembly and the lower slip assembly, the upper cone body and the lower cone body apply force to the diaphragm structure, the diaphragm structure deforms and changes diameter, the setting effect is achieved, and the blocking effect is stable and durable; and the whole body adopts a dissolvable material, so that the problems that the existing permanent bridge plug is not completely dissolved and needs manual fishing are avoided.

The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of an iris type dissolvable bridge plug of the present invention;

FIG. 2 is a top view of an aperture structure according to an embodiment of the present invention in an initial state;

FIG. 3 is a top view of a stop structure according to an embodiment of the present invention;

fig. 4 is a schematic structural view of an outer wall of an arc-shaped metal sheet according to an embodiment of the present invention.

Reference numerals

1. A mandrel; 2. a tubular shaft; 3. extruding the boss; 4. an upper compression ring; 5. an upper slip assembly; 6. a slip pressing table is arranged; 7. a first pressure ring; 8. a superior vertebral body; 9. an aperture structure; 10. an arc-shaped metal sheet; 11. the inferior vertebral body; 12. a second pressure ring; 13. a slip pressing table is lowered; 14. a lower slip assembly; 15. a lower pressure ring; 16. positioning the push pipe; 17. a slide rail; 18. a leakage-proof rubber strip; 19. a metal foil.

Detailed Description

The technical solution of the present invention is further illustrated by the accompanying drawings and examples.

Examples

As shown in the figure, an aperture type dissolvable bridge plug is sleeved on a tubular shaft 2, and the tubular shaft 2 is sleeved on a mandrel 1. The bridge plug comprises an upper pressing ring 4, an upper slip assembly 5, an upper slip pressing platform 6, a first pressing ring 7, an upper cone 8, an aperture structure 9, a lower cone 11, a second pressing ring 12, a lower slip pressing platform 13, a lower slip assembly 14, a lower pressing ring 15 and a positioning push sleeve 16 which are sequentially arranged.

Go up centrum 8, lower centrum 11 and aperture structure 9 and all adopt soluble material, but its corrosion resistance should be slightly higher than the used material of bridging plug itself, wherein go up slips and press platform 6, central hollow shaft 2 and slip down and press platform 13 to press the same with current slips and press the platform material, also can be different. The first press ring 7 and the second press ring are enough to support the pressure transmission between the slip press table and the conical body, and have higher strength.

The top of going up clamping ring 4 is provided with extrusion boss 3, goes up clamping ring 4 and fixes on the top of last slips subassembly 5, goes up clamping ring 4 and passes through last slips subassembly 5 to the application of force of last slips pressure table 6. Under the action of axial force, the top end of the upper slip pressing table 6 extends into the space between the upper slip assembly 5 and the tubular shaft 2 to play a role in setting. Go up slips and press platform 6 and be connected with first clamping ring 7, the lower terminal surface of first clamping ring 7 contacts with the up end of last centrum 8, goes up slips and presses platform 6 through 7 oppression centrum 8 of first clamping ring.

The positioning push sleeve 16 is fixedly connected with the lower pressing ring 15, the lower pressing ring 15 is fixedly connected with the lower slip assembly 14, and the bottom end of the lower slip pressing table 13 extends into a position between the lower slip assembly 14 and the tubular shaft 2. The lower slip pressing table 13 is connected with the second pressing ring 12, the upper end face of the second pressing ring 12 is in contact with the lower end face of the lower vertebral body 11, and the lower slip pressing table 13 presses the lower vertebral body 11 through the second pressing ring 12. The first compression ring 7 and the upper vertebral body 8, and the second compression ring 12 and the lower vertebral body 11 are in close contact, and the function of the compression ring is to prevent the loss of the axial force borne by the bridge plug in the process of transmission. The tight connection of the upper slip table 6 to the first press ring 7 and the tight connection of the lower slip table 13 to the second press ring 12 are to prevent losses during the transmission of axial forces. Meanwhile, the existence of the first compression ring 7 and the second compression ring 12 can prevent the upper and lower slip tables from being in direct contact with the upper and lower vertebral bodies to generate metal friction, and material loss is avoided, so that the performance is influenced.

The upper cone body 8 is a hollow cone with a downward conical surface, the bottom of the upper cone body 8 extends into the aperture structure 9, the lower cone body 11 is a hollow cone with an upward conical surface, and the top of the lower cone body 11 extends into the aperture structure 9. The degree of the slope of the upper and

lower cones

8, 11 determines the movement time of the aperture structure 9, the greater the slope of the slope, the faster the rate at which 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 cone 8 and the inner diameter of the upper end surface of the lower cone 11, so that the upper cone 8 and the lower cone 11 can easily slide along the tubular shaft 2 under the action of axial force. The lower terminal surface of the upper vertebral body 8 and the upper end surface of the lower vertebral body 11 are provided with matched clamping structures, so that the upper vertebral body 8 and the lower vertebral body 11 are locked after being contacted, the upper vertebral body and the lower vertebral body can be prevented from retreating, the aperture structure 9 retracts, and the plugging effect is invalid.

The aperture structure 9 comprises 15 arc-shaped metal sheets 10 which are sequentially overlapped, wherein the inner edge of each arc-shaped metal sheet 10 forms an inner circular surface, and the outer edge of each arc-shaped metal sheet 10 forms an outer circular surface. The thickness and the number of the arc-shaped metal sheets 10 determine the radius of the expanded diaphragm structure 9 to a certain extent, and the blocking effect of the bridge plug is influenced, so that the design can be carried out according to actual needs.

The middle part of the inner wall of the arc-shaped metal sheet 10 is provided with a pulley device which is vertical 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 the slide rail 17 can prevent the arc-shaped metal sheet 10 from falling off in the moving process to cause the failure of the plugging effect. By limiting the moving distance of the pulley device on the slide rail 17, the radius of the outer circular surface of the expanded diaphragm structure 9 can be changed, and therefore, the adjustment can be flexibly carried out according to actual needs.

The inner diameter of the lower end surface of the upper cone body 8 and the inner diameter of the upper end surface of the lower cone body 11 are smaller than the inner diameter of the diaphragm structure 9 in the initial state. The upper and lower hollow round surfaces of the aperture structure 9 are provided with metal sheets 19 which are used for fixing the initial form of the arc-shaped metal sheet 10 and preventing the upper and lower vertebral bodies from being drawn close to the aperture structure 9 by axial force in the transportation process of the bridge plug, so that the aperture structure 9 is stressed to expand outwards in advance. The transportation of bridge plug can be influenced to its expanded part, can make the environment radius grow behind the bridge plug transportation to the appointed place simultaneously, avoids diaphragm structure 9 still can not play the shutoff effect of bridge plug after the outside motion of atress is accomplished.

When the upper cone body 8 and the lower cone body 11 are respectively forced to approach the aperture structure 9 by the axial force, firstly the metal sheet 19 is broken, then the conical surfaces of the upper cone body and the lower cone body push the inner circular surface to expand outwards, the arc-shaped metal sheets 10 move under the stress, the pulley device starts to move along the sliding rail 17, the outer edges of the arc-shaped metal sheets 10 move from outside to inside along the outer walls of the adjacent arc-shaped metal sheets 10, and the movement tracks of each arc-shaped metal sheet 10 are the same. Compared with the diaphragm structure 9 in the initial state, the diaphragm structure 9 in the final closed state has a smaller coverage area of the adjacent arc-shaped metal sheets 10, and the radius of the inner circular surface is the same as the radius of the upper end surface of the upper cone 8 and the radius of the lower end surface of the lower cone 11.

The outermost end of the arc-shaped metal sheet 10 is provided with a leakage-proof rubber strip 18, and the leakage-proof rubber strip 18 is in contact with the outer wall of the adjacent arc-shaped metal sheet 10. The leak-proof rubber strips 18 cover the connecting gap of the two arc-shaped metal sheets 10, so that the solution of the bridge plug in the working environment is prevented from leaking between the outer wall and the inner wall of the adjacent arc-shaped metal sheets 10, and silt is stored in the pulley device and the slide rail 17, or the diaphragm structure 9 caused by corrosion in advance fails. After the diaphragm structure 9 enters the blocking state, the leak-proof rubber strips 18 can block the gaps on the outer circular surface, and the blocking effect of the bridge plug is enhanced. Compared with the existing permanent bridge plug, the whole bridge plug structure only has insoluble substances of the part of the leakage-proof rubber strip 18, reduces the amount of residues of the bridge plug after dissolution, and is more beneficial to the convenience of construction.

Finally, it should be noted that: the above embodiments are only intended to illustrate the technical solution of the present invention and not to limit the same, and although the present invention is described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the invention without departing from the spirit and scope of the invention.

Claims

1. The utility model provides a dissoluble bridge plug of light ring type, the cover is located on the hollow shaft, the hollow shaft cover is located on the dabber, its characterized in that: including last clamping ring, last slips subassembly, last slips pressure platform, first clamping ring, go up centrum, aperture structure, centrum, second clamping ring, slips pressure platform, slips subassembly down, lower clamping ring and location push away the cover down in the last clamping ring that sets gradually, it is the hollow cone of circular cone face down to go up the centrum, the bottom of going up the centrum stretches into in the aperture structure, the centrum is the hollow cone of circular cone face up down, the top of centrum stretches into down in the aperture structure, the aperture structure includes a plurality of overlap joint's arc sheetmetals in proper order, the inner wall middle part of arc sheetmetal is provided with pulley gear, and is adjacent be provided with on the outer wall of arc sheetmetal with pulley gear matched with slide rail.

2. An iris type dissolvable bridge plug according to claim 1, wherein: the top of going up the clamping ring is provided with the extrusion boss, it fixes to go up the clamping ring go up the top of slips subassembly, the top of going up the slips pressure table stretches into go up the slips subassembly with between the hollow shaft.

3. An iris type dissolvable bridge plug according to claim 2, wherein: the positioning push sleeve is fixedly connected with the lower pressing ring, the lower pressing ring is fixedly connected with the lower slip assembly, and the bottom end of the lower slip pressing table extends into the space between the lower slip assembly and the tubular shaft.

4. An iris type dissolvable bridge plug according to claim 3, wherein: go up the slips and press the platform with first clamping ring is connected, the lower terminal surface of first clamping ring with the up end of going up the centrum contacts, down the slips press the platform with the second clamping ring is connected, the up end of second clamping ring with the lower terminal surface of centrum contacts down.

5. An iris type dissolvable bridge plug according to claim 4, wherein: the radius of the tubular shaft is smaller than the inner diameter of the lower end face of the upper vertebral body and the inner diameter of the upper end face of the lower vertebral body, and the inner diameters of the lower end face of the upper vertebral body and the upper end face of the lower vertebral body are smaller than the inner diameter of the aperture structure in the initial state.

6. An iris type dissolvable bridge plug according to claim 1, wherein: the outermost end of arc sheetmetal is provided with the leak protection rubber strip, the leak protection rubber strip contacts with adjacent the outer wall of arc sheetmetal.

7. An iris type dissolvable bridge plug according to claim 6, wherein: and the centers of the upper surface and the lower surface of the aperture structure are respectively provided with a metal sheet.