Grading well cementation device

Abstract

The utility model relates to the technical field of well cementation devices, in particular to a graded well cementation device which comprises a graded cementing device and a well cementation rubber plug, a fixed circular plate is fixedly connected to the inner side of the well cementation rubber plug, a fixed column is arranged at the rear end of the fixed circular plate, and a first spring is fixedly connected to the front end in the fixed column. A conical supporting circular plate is fixedly connected to the rear end of the outer side of the fixing column, a supporting plate is fixedly connected to the outer side of the conical supporting circular plate, a fixing disc is fixedly connected to the rear end of the supporting plate, and a shear pin is fixedly connected to the outer side of the fixing disc; the rear end of the fixed disc is fixedly connected with a limiting column; and through design cooperation of the conical supporting circular plate and the supporting plate, the fixing circular disc can still keep the perpendicular relation with the grading cementing device under the condition that a small object falls into the well cementation device, the circulation hole is closed, and the well cementation effect is kept.

Description

Technical Field

[0001] This utility model relates to the field of cementing equipment technology, and in particular to a staged cementing device. Background Technology

[0002] A staged cementing device is a device that, based on a single cementing injection, uses a staged clamp to divide the annular cement seal into two or three sections as needed to achieve the technical requirements of cementing. This device is mainly used to avoid oil layer contamination and to achieve well workover operations without drilling plugs after cementing.

[0003] A patent specification with publication number CN222162555U discloses a bidirectional sealing staged cementing device. This technology discloses that it "includes a staged cement injector and a cementing plug. The staged cement injector has multiple circulation holes. A fixed plate is slidably installed inside the staged cement injector. A cylinder is fixedly installed at one end of the fixed plate. A top plate is fixedly installed at the end of the cylinder away from the fixed plate. A fixed ring is fixedly installed inside the staged cement injector. A baffle is fixedly installed on the inner ring of the fixed ring. A conical block is fixedly installed at one end of the cementing plug. A positioning post is fixedly installed at the end of the conical block away from the cementing plug. A positioning component for locking the positioning post is provided on the cylinder. The advantage is that the cooperation of the fixed plate, cylinder, top plate, fixed ring, and baffle facilitates the opening of the staged cement injector, thereby achieving staged cementing and facilitating the smooth completion of cementing operations."

[0004] In existing staged cementing devices, tools or small stones may fall into the device during operation due to inadequate inspection or improper measures. These objects can affect the fit between the cone block and the fixing ring. Furthermore, since the front end of the fixing plate is inverted cone-shaped, fallen objects may slide into the front end of the top plate, potentially causing the fixing plate and cone block to fail to align. This can damage the cementing device or affect its normal operation, requiring work to be suspended and the fallen objects retrieved, leading to extended operation time and increased costs. Therefore, a staged cementing device is proposed to overcome the above-mentioned defects.

[0005] To address the aforementioned problems, this application proposes a staged cementing device. Utility Model Content

[0006] To address the problems mentioned in the background section, this invention provides a staged cementing device that prevents the fixing plug from failing to close the circulation hole due to falling debris, and also ensures that the limiting column is stably engaged with the fixing ring.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a staged cementing device, comprising a staged cementing injector and a cementing plug, wherein a fixed circular plate is fixedly connected to the inner side of the cementing plug, a fixed column is provided at the rear end of the fixed circular plate, a first spring is fixedly connected to the front end of the fixed column, a first limiting plate is fixedly connected to the end of the first spring away from the fixed column, a first baffle is fixedly connected to the outer side of the first limiting plate, a conical support circular plate is fixedly connected to the rear end of the outer side of the fixed column, a support plate is fixedly connected to the outer side of the conical support circular plate, a fixed disk is fixedly connected to the rear end of the support plate, a shear pin is fixedly connected to the outer side of the fixed disk, a limiting column is fixedly connected to the rear end of the fixed disk, a second spring is fixedly connected to the rear end of the limiting column, a second limiting plate is fixedly connected to the end of the second spring away from the limiting column, a second baffle is fixedly connected to the outer side of the second limiting plate, a protrusion is fixedly connected to the rear end of the outer side of the limiting column, a fixing ring is provided at the rear end of the limiting column, and a circulation hole is opened on the outer surface of the staged cementing injector.

[0008] In a preferred embodiment of this utility model of a staged cementing device, the rear end of the conical support plate is fixedly connected to the front end of the fixed plate, the rear end of the fixed column is fixedly connected to the front end of the fixed plate, the outer side of the fixed column is fitted with the inner side of the fixed plate, the front end of the support plate is fitted with the rear end of the fixed plate, the limiting column is fitted with the inner side of the fixed ring, and the rear end of the fixed plate is fitted with the front end of the fixed ring. By moving the fixed plate, the outflow and closure of the circulating hole cement slurry can be controlled. The outer side of the fixed ring is fixedly connected to the inner side of the staged cementing injector.

[0009] As a preferred embodiment of the graded cementing device of this utility model, the rear end of the fixed circular plate is provided with a circular hole, and the cross-sectional area and depth of the circular hole are matched with the cross-sectional area and depth of the fixed column. The inner wall of the circular hole inside the fixed circular plate is provided with an annular groove, and the depth of the annular groove is matched with the upper and lower lengths of the first baffle, so that the fixed circular plate can be fixedly connected with the fixed circular plate and the fixed plate by being inserted into the annular groove through the first baffle.

[0010] In a preferred embodiment of the graded cementing device of this utility model, the total length of the support plate in the left and right directions plus the tapered support plate is consistent with the diameter of the fixed plate, so that the falling objects fall on the left and right sides of the support plate, and the fixed plate can still close the circulation hole even when there are falling objects.

[0011] As a preferred embodiment of the graded cementing device of this utility model, a square slot is provided on the inner side of the fixing column. The first spring and the first baffle are located in the square slot, and the front-to-back length of the square slot is the same as the front-to-back length of the first baffle. The upper end of the square slot has a protrusion, and the protrusion restricts the movement of the first baffle in the square slot, so that the first baffle can pass through the circular hole and engage with the annular slot to complete the connection between the fixing plate and the fixing column.

[0012] As a preferred embodiment of the graded cementing device of this utility model, a through hole is provided on the inner side of the fixing ring, and the diameter and depth of the through hole are consistent with the diameter and front and rear length of the limiting column, so that the fixing plate and the fixing ring can be engaged, and the fixing plate is fixed at the front end of the fixing ring.

[0013] As a preferred embodiment of the graded cementing device of this utility model, a positioning groove is provided on the inner wall of the through hole opened on the inner side of the fixing ring. The depth of the positioning groove matches the vertical length of the protrusion. An annular groove is provided on the inner side of the fixing ring, and the horizontal length of the annular groove matches the horizontal length of the second baffle. The depth of the annular groove is half the depth of the positioning groove, so that the limiting post can accurately pass through the through hole opened on the fixing ring, realizing the connection between the fixing plate and the fixing ring.

[0014] This utility model has the following beneficial effects:

[0015] The graded cementing device designed in this utility model, through the design and cooperation of the conical support plate and the support plate, allows smaller objects that fall into the cementing device to fall into the upper and lower sides of the support plate, so that the fixed disc remains perpendicular to the graded cement injector, closes the circulation hole, maintains the cementing effect, and avoids the fixed disc being unable to close the circulation hole due to fallen objects, which would require retrieval and lead to extended operation time and increased costs.

[0016] The graded cementing device designed in this utility model, through the design and cooperation of the protrusion and the annular groove, enables the fixed plate to stably engage the second baffle in the annular groove under high water pressure when the shear pin breaks, thereby fixing the fixed plate and the fixed ring, opening the circulation hole and improving stability. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0018] Figure 1 This is a schematic diagram of the longitudinal section structure of the graded cement injector of this utility model;

[0019] Figure 2This is a longitudinal sectional view of the fixed circular plate of this utility model;

[0020] Figure 3 This is a schematic diagram of the longitudinal section structure of the fixed column of this utility model;

[0021] Figure 4 This is a schematic diagram of the longitudinal cross-sectional structure of the fixed disk of this utility model;

[0022] Figure 5 This is a schematic diagram of the longitudinal cross-sectional structure of the limiting rod of this utility model;

[0023] Figure 6 This is a schematic diagram of the longitudinal cross-sectional structure of the fixing ring of this utility model.

[0024] Legend:

[0025] 1. Staged cement injector; 2. Cementing plug; 3. Conical support plate; 4. Support plate; 5. Fixing disc; 6. Shear pin; 7. Fixing ring; 8. Fixing post; 9. First baffle; 10. Limiting post; 11. Second baffle; 12. Protrusion; 13. Circulation hole; 14. Fixing plate; 15. First spring; 16. First limiting plate; 17. Second spring; 18. Second limiting plate. Detailed Implementation

[0026] 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.

[0027] Example 1

[0028] like Figures 1 to 6 As shown;

[0029] A staged cementing device includes a staged cement injector 1 and a cementing plug 2.

[0030] In this implementation plan: As disclosed in the background technology above, "At the work site, due to lax inspection or improper measures, tools or small stones may fall into the cementing device. These objects will affect the fit between the cone block and the fixing ring. Moreover, the front end of the fixing plate is inverted cone-shaped, and the fallen objects may slide into the front end of the top plate from the inverted cone shape, which may cause the fixing plate and the cone block to fail to connect, causing damage to the cementing device or affecting its normal operation. It is necessary to suspend the operation and retrieve the fallen objects, resulting in the extension of operation time and the increase of cost." In combination with this, the problem is obviously present and difficult to solve. Therefore, in order to solve this technical problem, the support plate 4 and the protrusion 12 are added to this application document.

[0031] Furthermore:

[0032] like Figures 1 to 6 As shown:

[0033] Based on the above: the inner side of the cementing plug 2 is glued to the fixed circular plate 14, the rear end of the fixed circular plate 14 is provided with a fixed post 8, the front end of the fixed post 8 is welded with a first spring 15, the end of the first spring 15 away from the fixed post 8 is welded with a first limiting plate 16, the outer side of the first limiting plate 16 is welded with a first baffle 9, the rear end of the outer side of the fixed post 8 is welded with a conical support circular plate 3, the outer side of the conical support circular plate 3 is welded with a support plate 4, the rear end of the support plate 4 is welded with a fixed disc 5, the outer side of the fixed disc 5 is welded with a shear pin 6, the rear end of the fixed disc 5 is welded with a limiting post 10, the rear end of the inner side of the limiting post 10 is welded with a second spring 17, the end of the second spring 17 away from the limiting post 10 is welded with a second limiting plate 18, the outer side of the second limiting plate 18 is welded with a second baffle 11, the rear end of the outer side of the limiting post 10 is welded with a protrusion 12, the rear end of the limiting post 10 is provided with a fixing ring 7, and the outer surface of the staged cement injector 1 is provided with a circulation hole 13.

[0034] In this embodiment: smaller objects that fall into the cementing device can fall into the upper and lower sides of the support plate, so that the fixed disc remains perpendicular to the staged cement injector and the circulation hole is closed.

[0035] In an optional embodiment: the rear end of the tapered support plate 3 is fixedly connected to the front end of the fixed plate 5, the rear end of the fixed column 8 is fixedly connected to the front end of the fixed plate 5, the outer side of the fixed column 8 is fitted with the inner side of the fixed plate 14, the front end of the support plate 4 is fitted with the rear end of the fixed plate 14, the limiting column 10 is fitted with the inner side of the fixed ring 7, the rear end of the fixed plate 5 is fitted with the front end of the fixed ring 7, and the outer side of the fixed ring 7 is fixedly connected to the inner side of the graded cement injector 1.

[0036] In this embodiment, the flow of cement slurry from the circulation hole 13 is controlled and closed by moving the fixed plate 5.

[0037] In an optional embodiment: a circular hole is provided at the rear end of the fixed circular plate 14, and the cross-sectional area and depth of the circular hole are matched with the cross-sectional area and depth of the fixed column 8. An annular groove is provided on the inner wall of the circular hole inside the fixed circular plate 14, and the depth of the annular groove is matched with the vertical length of the first baffle 9.

[0038] In this embodiment, the fixed circular plate 14 can be fixedly connected to the fixed disk 5 by being inserted into the annular groove by the first baffle 9.

[0039] In an optional embodiment, the total length of the support plate 4 in the left and right directions plus the tapered support plate 3 is the same as the diameter of the fixed plate 5.

[0040] In this embodiment, the falling objects are placed on the left and right sides of the support plate 4, so that the fixed circular plate 14 can still close the circulation hole 13 even when there are falling objects.

[0041] In an optional embodiment: a square slot is provided on the inner side of the fixed column 8, the first spring 15 and the first baffle 9 are located in the square slot, and the front-to-back length of the square slot is the same as the front-to-back length of the first baffle 9. There is a protrusion at the upper end of the square slot, and the protrusion restricts the movement of the first baffle 9 in the square slot.

[0042] In this embodiment, the first baffle 9 can pass through the circular hole and engage with the annular slot to complete the connection between the fixed circular plate 14 and the fixed column 8.

[0043] According to the above, in order to ensure that the limiting post can stably pass through the fixing ring, a protrusion installed on the outside of the limiting post is also included.

[0044] In this implementation scheme: the design of the protrusion and the annular groove allows the fixed plate to stably engage the second baffle in the annular groove under high water pressure when the shear pin breaks, thus fixing the fixed plate and the fixed ring together, opening the circulation hole and improving stability.

[0045] In an optional embodiment: a through hole is provided on the inner side of the fixing ring 7, and the diameter and depth of the through hole are consistent with the diameter and front and rear length of the limiting post 10.

[0046] In this embodiment, the fixing disk 5 and the fixing ring 7 can be engaged, so that the fixing disk 5 is fixed at the front end of the fixing ring 7.

[0047] In an optional embodiment: a positioning groove is provided on the inner wall of the through circular hole on the inner side of the fixing ring 7, the depth of the positioning groove matches the vertical length of the protrusion 12, and an annular groove is provided on the inner side of the fixing ring 7, the horizontal length of the annular groove matches the horizontal length of the second baffle 11, and the depth of the annular groove is half the depth of the positioning groove.

[0048] In this embodiment, the limiting post 10 can accurately pass through the through hole in the fixing ring 7, thereby achieving the connection between the fixing plate 5 and the fixing ring 7.

[0049] Working principle and usage process of this utility model:

[0050] The staged cementing device 1 is lowered into the well to a predetermined position along with the casing string. Cementing fluid is then injected, exerting pressure on the fixed plate 5. When the pressure becomes excessive, the shear pins 6 on the outer side of the fixed plate 5 break, causing the fixed plate 5 to move towards the fixed ring 7. This allows the protrusion 12 to move within the positioning groove on the inner wall of the through-hole in the fixed ring 7. When the second baffle 11 moves into the annular groove, the second spring 17 pushes the second limiting plate 18 to move outwards towards the limiting post 10. The second limiting plate 18 then moves the second baffle 11 outwards, causing the limiting post 10 to engage with the fixed ring 7, thus connecting the fixed plate 5 and the fixed ring 7. Simultaneously, the movement of the fixed plate 5 removes the obstruction of the circulation hole 13, allowing cementing fluid to flow outwards from the circulation hole 13. Next, a secondary cementing operation is performed. The cement plug 2 is placed in the well, and the plugging fluid is used as the post-filling fluid to push the cement plug 2 towards the fixed plate 5. The fixed column 8 passes through the circular hole opened at the rear end of the cement plug 2. When the first baffle 9 moves into the annular groove, the first spring 15 pushes the first limiting plate 16 to move. The first limiting plate 16 pushes the first baffle 9 to move outward of the fixed column 8, so that the first baffle 9 is inserted into the annular groove, realizing the connection between the fixed circular plate 14 and the fixed column 8. At the same time, the rear end of the cement plug 2 is attached to the front end of the support plate 4 and the conical support circular plate 3. The outer side of the cement plug 2 blocks the circulation hole 13 opened by the staged cement injector 1, thereby realizing staged cement injection and facilitating the smooth completion of the cementing operation.

[0051] Finally, it should be noted that the above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A staged cementing device, comprising a staged cementing injector (1) and a cementing plug (2), characterized in that: A fixing circular plate (14) is fixedly connected to the inner side of the cementing plug (2). A fixing column (8) is provided at the rear end of the fixing circular plate (14). A first spring (15) is fixedly connected to the front end of the fixing column (8). A first limiting plate (16) is fixedly connected to the end of the first spring (15) away from the fixing column (8). A first baffle (9) is fixedly connected to the outer side of the first limiting plate (16). A conical support circular plate (3) is fixedly connected to the rear end of the outer side of the fixing column (8). A support plate (4) is fixedly connected to the outer side of the conical support circular plate (3). A fixing disc (5) is fixedly connected to the rear end of the support plate (4). A shear pin (6) is fixedly connected to the outside of the fixed plate (5). A limit post (10) is fixedly connected to the rear end of the fixed plate (5). A second spring (17) is fixedly connected to the rear end of the limit post (10). A second limit plate (18) is fixedly connected to the end of the second spring (17) away from the limit post (10). A second baffle (11) is fixedly connected to the outside of the second limit plate (18). A protrusion (12) is fixedly connected to the rear end of the outer side of the limit post (10). A fixing ring (7) is provided at the rear end of the limit post (10). A circulation hole (13) is opened on the outer surface of the graded cement injector (1).

2. The staged cementing device according to claim 1, characterized in that: The rear end of the conical support plate (3) is fixedly connected to the front end of the fixed plate (5), the rear end of the fixed column (8) is fixedly connected to the front end of the fixed plate (5), the outer side of the fixed column (8) is fitted with the inside of the fixed plate (14), the front end of the support plate (4) is fitted with the rear end of the fixed plate (14), the limiting column (10) is fitted with the inside of the fixed ring (7), the rear end of the fixed plate (5) is fitted with the front end of the fixed ring (7), and the outer side of the fixed ring (7) is fixedly connected to the inner side of the graded cement injector (1).

3. The staged cementing device according to claim 1, characterized in that: The fixed circular plate (14) has a circular hole at its rear end, and the cross-sectional area and depth of the circular hole are matched with the cross-sectional area and depth of the fixed column (8). The inner wall of the circular hole inside the fixed circular plate (14) has an annular groove, and the depth of the annular groove is matched with the vertical length of the first baffle (9).

4. A staged cementing device according to claim 1, characterized in that: The total length of the support plate (4) in the left and right directions plus the tapered support plate (3) is consistent with the diameter of the fixed plate (5).

5. A staged cementing device according to claim 1, characterized in that: The fixed column (8) has a square slot on its inner side. The first spring (15) and the first baffle (9) are located in the square slot. The front-to-back length of the square slot is the same as the front-to-back length of the first baffle (9). The upper end of the square slot has a protrusion, and the protrusion restricts the first baffle (9) from moving in the square slot.

6. A staged cementing device according to claim 1, characterized in that: The inner side of the fixing ring (7) is provided with a through hole, and the diameter and depth of the through hole are consistent with the diameter and front and rear length of the limiting post (10).

7. A staged cementing device according to claim 1, characterized in that: The inner wall of the through hole on the inner side of the fixing ring (7) is provided with a positioning groove. The depth of the positioning groove matches the vertical length of the protrusion (12). The inner side of the fixing ring (7) is provided with an annular groove, and the left and right length of the annular groove matches the left and right length of the second baffle (11). The depth of the annular groove is half the depth of the positioning groove.

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