CN218953257U

CN218953257U - Plugging tool righting mechanism

Info

Publication number: CN218953257U
Application number: CN202320032526.2U
Authority: CN
Inventors: 睢圣; 吴霞; 李昱垚; 曹彬; 罗翰; 王慕阳; 程观华; 陈虹霓; 江定川; 赵瑞
Original assignee: Sinopec Oilfield Service Corp; Drilling Engineering Research Institute of Sinopec Southwest Petroleum Engineering Co Ltd
Current assignee: Sinopec Oilfield Service Corp; Drilling Engineering Research Institute of Sinopec Southwest Petroleum Engineering Co Ltd
Priority date: 2023-01-06
Filing date: 2023-01-06
Publication date: 2023-05-02
Anticipated expiration: 2033-01-06

Abstract

The utility model relates to the technical field of well drilling plugging tools and discloses a plugging tool righting mechanism, which comprises an upper cone pad, a righting ring and a lower cone pad which are sleeved on a central tube of the plugging tool from top to bottom; the lower surface of the upper cone pad and the upper surface of the lower cone pad are conical surfaces with the lower ends facing the center of the central tube; the centering ring is divided into a plurality of sector blocks through a plurality of cutting grooves, and the inner walls of the sector blocks are connected into a whole; the upper end face and the lower end face of the sector block are respectively matched with the lower surface of the upper cone pad and the upper surface of the lower cone pad. The centralizing ring is of an integral structure before use, and is convenient to be connected with the central pipe, the upper cone pad and the lower cone pad in an installation manner, so that the plugging tool is simpler to assemble. The outer wall of the sector block is attached to the outer wall of the well hole to achieve the purpose of centralizing, and coaxiality of the plugging tool and the well hole can be effectively guaranteed.

Description

Plugging tool righting mechanism

Technical Field

The utility model relates to the technical field of well drilling plugging tools, in particular to a plugging tool righting mechanism.

Background

The plugging tool is mainly used for temporarily plugging the local position in the well bore during well drilling, and mainly utilizes the joint of the packing element and the wall of the well bore so as to realize the sealing effect on the well bore. Meanwhile, in order to ensure the coaxiality of the plugging tool and the well hole so as to improve the sealing effect, most of the existing plugging tools are provided with a centralizing mechanism. However, the existing centralizing mechanisms of the plugging tools adopt independent mounting structures, namely, the centralizing blocks are independent individuals before or during the use of the plugging tools, so that the number of parts of the plugging tools is increased, and the assembly difficulty of the plugging tools is increased.

Patent application number CN201420696391.0 discloses a centralizing packer, the centralizing mechanism comprises a cone, a centralizing body and a centralizing body seat; the centralizing body is arranged on the centralizing body seat, and slides along with the lower conical surface of the cone along with the pushing of the centralizing body seat, so that the centralizing effect is realized. In this prior art, there is the following defect, when carrying out the installation of righting body, the installation is comparatively complicated to righting body installs on righting body seat, is difficult to guarantee the axiality of righting body and borehole, influences the shutoff effect. Based on the above drawbacks, there is a need for a centralizing mechanism that is simple in structure, easy to assemble, and capable of effectively ensuring the coaxiality of a lost circulation tool and a wellbore.

Disclosure of Invention

In order to solve the problems, the utility model aims to provide the plugging tool righting mechanism which is simple in structure and convenient to assemble, and can effectively ensure the coaxiality of the plugging tool and a borehole.

In order to achieve the above purpose, the present utility model adopts the technical scheme that:

the centering mechanism of the plugging tool comprises an upper cone pad, a centering ring and a lower cone pad which are sleeved on a central tube of the plugging tool from top to bottom; the lower surface of the upper cone pad and the upper surface of the lower cone pad are conical surfaces with the lower ends facing the center of the central tube; the centering ring is divided into a plurality of sector blocks through a plurality of cutting grooves, and the inner walls of the sector blocks are connected into a whole; the upper end face and the lower end face of the sector block are respectively matched with the lower surface of the upper cone pad and the upper surface of the lower cone pad.

As a preferred implementation scheme, the upper end face and the lower end face of the sector block are respectively provided with a convex block, the lower surface of the upper cone pad and the upper surface of the lower cone pad are respectively provided with a groove, and the convex blocks are matched with the grooves.

As a preferred embodiment, the cutting grooves are provided with at least 6 grooves along the circumferential direction of the centralizing ring.

As a preferred embodiment, the outer diameter of the upper cone pad and the lower cone pad is larger than or equal to the outer diameter of the centralizing ring.

As a preferred embodiment, the outer wall of the centralizing ring is provided with a plurality of annular grooves.

As a preferred implementation scheme, the outer wall of the central tube is provided with a limiting pin, the inner wall of the lower cone pad is provided with a strip-shaped hole along the axial direction, and the limiting pin is matched with the strip-shaped hole.

The utility model has the beneficial effects that:

the utility model provides a centralizing mechanism of a plugging tool, wherein a centralizing ring is sleeved on a central pipe, so that the centralizing mechanism is convenient to install, and the coaxiality of the centralizing ring and the central pipe is ensured; the centering ring consists of a plurality of sector blocks, is of an integral structure before use, and is convenient to be connected with the central pipe, the upper cone pad and the lower cone pad in an installation way, so that the plugging tool is simpler to assemble. The outer wall of the sector block is attached to the outer wall of the well hole to achieve the purpose of centralizing, and coaxiality of the plugging tool and the well hole can be effectively guaranteed.

Drawings

FIG. 1 is a cross-sectional view of the righting mechanism of the present utility model;

FIG. 2 is a cross-sectional view of the structure of the righting mechanism of the present utility model in operation;

FIG. 3 is a schematic diagram of the structure of the centering ring of the present utility model;

FIG. 4 is a schematic view of the upper cone pad structure of the present utility model;

FIG. 5 is a schematic view of the lower cone pad structure of the present utility model;

in the figure: 1. a central tube; 2. an upper cone pad; 3. centralizing the ring; 31. a sector block; 32. cutting a groove; 33. a bump; 34. an annular groove; 4. a lower cone pad; 5. a groove; 6. a limiting pin; 7. and a strip-shaped hole.

Detailed Description

The present utility model will be further described with reference to the accompanying drawings, in order to make the objects, technical solutions and advantages of the present utility model more apparent. In the description of the present utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present utility model and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Example 1

As shown in fig. 1-5, the present embodiment provides a centralizing mechanism of a plugging tool, which comprises an upper conical pad 2, a centralizing ring 3 and a lower conical pad 4 which are sleeved on a central pipe 1 of the plugging tool from top to bottom; the lower surface of the upper cone pad 2 and the upper surface of the lower cone pad 4 are conical surfaces with the lower ends facing the center of the central tube 1; the centralizing ring 3 is divided into a plurality of sector blocks 31 through a plurality of cutting grooves 32, and the inner walls of the sector blocks 31 are connected into a whole; the upper and lower end surfaces of the sector block 31 are respectively matched with the lower surface of the upper cone pad 2 and the upper surface of the lower cone pad 4.

The upper cone pad 2, the centralizing ring 3 and the lower cone pad 4 are directly arranged on the central pipe 1 in a sleeved mode, and the structure installation mode is simple; the lower surface of the upper cone pad 2 and the upper surface of the lower cone pad 4 are conical surfaces with the lower ends facing the center of the central tube 1; through the cooperation structure of conical surface, can make the centering ring 3 evenly to circumference side removal under the promotion effect of lower cone pad 4 to guarantee the axiality of leaking stoppage instrument and borehole. The centering ring 3 is provided with cutting grooves 32 along a circumferential array, the planes of the cutting grooves 32 are respectively in the same plane with the axis of the centering ring 3, the cutting grooves 32 only penetrate through the two ends and the outer wall of the centering ring 3, and a preset interval is reserved between the inner wall of the centering ring 3 and the cutting grooves 32 to form a plurality of fan-shaped blocks 31 with connected inner walls. When the plugging tool is used, the position of the upper cone pad 2 along the axis of the central tube 1 is kept fixed, the lower cone pad 4 is pushed upwards by using external force, so that the centralizing ring 3 is separated along the cutting groove 32 to form a plurality of independent fan-shaped blocks 31, the fan-shaped blocks 31 are protruded towards the outer periphery side of the central tube 1 at the same time, and the outer wall of the fan-shaped blocks 31 are attached to the well wall to centralize the plugging tool. Preferably, the preset interval between the cutting groove 32 and the inner wall of the centralizing ring 3 is 1mm-10mm, and if the interval value is too small, the centralizing ring 3 is easily damaged before being assembled, transported or used, and the centralizing ring is not beneficial to being used in a well; if the spacing is too great, this results in a greater force being required to push the lower cone pad 4 away from the centralizer ring 3 from the cutter groove 32 during operation of the lost circulation tool. The spacing sizes generally employed are therefore 2mm, 3mm, 4mm, 5mm. When the overall size of the plugging tool and the centralizing ring 3 is larger, the interval size can be 7mm, 8mm and 9mm; the lower conical pad 4 is typically pushed by hydraulic pressure during operation of the plugging tool.

Example 2

As shown in fig. 1 to 5, the present embodiment is developed on the basis of the foregoing embodiments, and specifically, the present embodiment provides a centering mechanism for a plugging tool, the upper and lower end surfaces of the sector block 31 are provided with protrusions 33, the lower surface of the upper cone pad 2 and the upper surface of the lower cone pad 4 are provided with grooves 5, and the protrusions 33 are matched with the grooves 5. The two end faces of the centralizing ring 3 are respectively provided with a convex block 33 between every two adjacent cutting grooves 32, the convex blocks 33 are in a state of being arranged along the normal direction on the projection view of the axis of the centralizing ring 3, the lower surface of the upper conical pad 2 and the upper surface of the lower conical pad 4 are respectively provided with a groove 5, and the grooves 5 are in a state of being arranged along the normal direction on the projection view of the axis of the centralizing ring 3. The protrusion 33 is matched with the groove 5, so that the sector 31 is ensured to have a fixed moving direction, and is prevented from shifting in the moving process.

As a preferred embodiment, in order to further increase the righting effect, the cutting grooves 32 are provided with at least 6 grooves along the circumferential direction of the righting ring 3; when the plugging tool works, at least 6 sector blocks 31 are formed, so that the coaxiality of the centralizing ring 3 and the central pipe 1 and the well hole of the plugging tool is higher.

As a preferred embodiment, in order to prevent the centralizing ring 3 from rubbing against the side wall of the borehole during the well running process, the outer diameters of the upper cone pad 2 and the lower cone pad 4 are larger than or equal to the outer diameter of the centralizing ring 3.

As a preferred embodiment, the outer wall of the centralizing ring 3 is provided with a plurality of annular grooves 34; the annular groove 34 is used for enabling the outer wall of the centralizing ring 3 to be attached with the inner wall of the well hole more stably.

As a preferred embodiment, the outer wall of the central tube 1 is provided with a limiting pin 6, the inner wall of the lower cone pad 4 is provided with a bar-shaped hole 7 along the axial direction, and the limiting pin 6 is matched with the bar-shaped hole 7. When the lower cone pad 4 moves upwards, the limiting pin 6 can slide in the strip-shaped hole 7 so as to prevent the lower cone pad 4 from rotating and influence the connection stability of the righting mechanism and the well wall. And through restricting the rotation of the lower cone pad 4, the upper cone pad 2 and the centralizing ring 3 can be prevented from rotating simultaneously by utilizing the interconnection relation between the groove 5 and the convex blocks 33, so that the position between the upper cone pad 2 and the centralizing ring 3 is more stable relative to the central pipe 1, and the centralizing ring 3 is prevented from being damaged before the transportation, connection and plugging tool is used.

Example 3

As shown in fig. 1-5, the present embodiment is developed on the basis of the foregoing embodiments, and specifically, the present embodiment provides a centering principle of a centering mechanism of a plugging tool, as follows:

in this embodiment, six cutting grooves 32 are provided on the centering ring 3; when the plugging tool works, the lower cone pad 4 is pushed by utilizing hydraulic pressure, the lower cone pad 4 generates upward acting force to act on the centralizing ring 3, and the inner wall of the centralizing ring 3 is broken along with the increase of acting force, so that the centralizing ring 3 is divided into six sector blocks 31 from the cutting groove 32, and the sector blocks 31 are uniformly moved to the axial side under the pushing of the lower cone pad 4 until the outer wall of the sector blocks 31 are attached to the well wall, so that the plugging tool is centralized.

The foregoing has shown and described the basic principles, principal features and advantages of the utility model. It will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present utility model, and various changes and modifications may be made without departing from the spirit and scope of the utility model, which is defined in the appended claims. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a leaking stoppage instrument righting mechanism which characterized in that: the centralizing mechanism comprises an upper cone pad (2), a centralizing ring (3) and a lower cone pad (4) which are sleeved on the central pipe (1) of the plugging tool from top to bottom; the lower surface of the upper conical pad (2) and the upper surface of the lower conical pad (4) are conical surfaces with the lower ends facing the center of the central tube (1); the centering ring (3) is divided into a plurality of sector blocks (31) through a plurality of cutting grooves (32), and the inner walls of the sector blocks (31) are connected into a whole; the upper end face and the lower end face of the sector block (31) are respectively matched with the lower surface of the upper conical pad (2) and the upper surface of the lower conical pad (4).

2. A lost circulation tool centralizer according to claim 1, wherein: the upper end face and the lower end face of the sector block (31) are respectively provided with a bump (33), the lower surface of the upper cone pad (2) and the upper surface of the lower cone pad (4) are respectively provided with a groove (5), and the bumps (33) are matched with the grooves (5).

3. A lost circulation tool centralizer according to claim 1, wherein: the cutting grooves (32) are at least provided with 6 cutting grooves along the circumferential direction of the righting ring (3).

4. A lost circulation tool centralizer according to claim 1, wherein: the outer diameters of the upper cone pad (2) and the lower cone pad (4) are larger than or equal to the outer diameter of the centralizing ring (3).

5. A lost circulation tool centralizer according to claim 1, wherein: the outer wall of the righting ring (3) is provided with a plurality of annular grooves (34).

6. A lost circulation tool centralizer according to claim 1, wherein: the outer wall of the central tube (1) is provided with a limiting pin (6), the inner wall of the lower conical pad (4) is provided with a strip-shaped hole (7) along the axis direction, and the limiting pin (6) is matched with the strip-shaped hole (7).