Floating shoe with variable flow channel

Abstract

The utility model discloses a variable runner float shoe which comprises a float shoe body, an upper supporting plate with an upper through hole, a middle supporting plate with a middle through hole and a lower supporting plate with a lower supporting plate through hole are sequentially arranged in the float shoe body from top to bottom, and the lower supporting plate is movably arranged in the float shoe body. The lower supporting plate is provided with a floating ball connecting rod, the floating ball connecting rod penetrates through the middle supporting plate and is connected with a floating ball through a floating ball shear pin, the floating ball is located under the upper through hole, and the floating ball connecting rod is sleeved with a first compression spring; the middle supporting plate is connected with a gravity ball connecting rod, and the gravity ball connecting rod penetrates through a through hole of the lower supporting plate and is connected with a gravity ball through a gravity ball shear pin. And a second compression spring is arranged between the lower supporting plate and the middle supporting plate. The automatic grouting device has an automatic grouting function during casing running, the requirement of a forward circulation channel in well cementation operation is met, a one-way channel can be achieved after well cementation is finished, and cement is prevented from flowing back into a casing.

Description

Technical Field

[0001] The utility model belongs to the field of offshore drilling operations, in particular to a floating shoe with a variable flow channel. Background Art

[0002] At present, the bottom floating shoe used for casing cementing in drilling operations is generally a check valve. During the casing operation, the channel for cement slurry to enter the casing from the casing / open hole annulus is in a closed state. In order to balance the pressure difference between the inside and outside of the casing, the casing gap can only be used to connect the casing and use a pipeline to fill the casing from the wellhead. This is not only inefficient and increases operating costs, but also increases the risk of casing sticking when it is left stationary for a long time. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides a floating shoe with a variable flow channel.

[0004] The utility model adopts the following technical solutions:

[0005] A variable flow path float shoe comprises a float shoe body, wherein an upper support plate with an upper through hole, a middle support plate with a middle through hole and a lower support plate with a lower support plate through hole are arranged in sequence from top to bottom in the float shoe body, and the lower support plate is movably arranged in the float shoe body; a float connecting rod is arranged on the lower support plate, the float connecting rod passes through the middle support plate and is connected to the float ball through a float shear pin, and the float ball is located directly below the upper through hole, and a first compression spring is sleeved on the float connecting rod; the middle support plate is connected to a gravity ball connecting rod, the gravity ball connecting rod passes through the through hole of the lower support plate and is connected to the gravity ball through the gravity ball shear pin; a second compression spring is arranged between the lower support plate and the middle support plate.

[0006] Furthermore, a directional guide rail is provided between the upper support plate and the middle support plate, and the directional guide rail is located around the floating ball.

[0007] Furthermore, a positioning step is provided in the middle of the inner wall of the float shoe body, and the positioning step is located below the lower support plate.

[0008] Furthermore, a bottom through hole is provided at the bottom of the float shoe body.

[0009] Furthermore, a side through hole is provided on the lower side wall of the float shoe body.

[0010] Furthermore, a baffle is provided near the bottom of the float shoe body, and a baffle through hole is provided on the baffle.

[0011] The beneficial effects of the utility model are:

[0012] The utility model effectively solves the problem that the conventional cementing float shoe can only use the gap between the connecting casings to use pipelines to inject liquid into the casing from the wellhead during the casing operation, which is inefficient and has a high risk of casing sticking. The utility model has an automatic grouting function during the casing operation, which meets the requirements of the positive circulation channel of the cementing operation. After the cementing is completed, a one-way channel can be realized to prevent cement from flowing back into the casing. The utility model has a clever structure, strong practicality, and broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the utility model;

[0014] Figure 2 This is a diagram of the use state of the utility model (automatic grouting state during casing installation);

[0015] Figure 3 This is a diagram of the utility model in use (well cementing state after the casing is in place);

[0016] Figure 4 It is a usage state diagram (waiting for setting state) of the utility model.

[0017] Among them, 1. upper through hole; 2. directional guide rail; 3. float; 4. float shear pin; 5. float connecting rod; 6. first compression spring; 7. lower support plate; 8. positioning step; 9. baffle through hole; 10. float shoe body; 11. upper support plate; 12. upper support plate fixing pin; 13. middle support plate; 14. middle through hole; 15. middle support plate fixing pin; 16. gravity ball connecting rod; 17. second compression spring; 18. gravity ball shear pin; 19. lower support plate through hole; 20. gravity ball; 21. side through hole; 22. baffle; 23. bottom through hole. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0019] like Figures 1 to 4 As shown, a variable flow path float shoe comprises a float shoe body 10; a side through hole 21 is provided on the lower side wall of the float shoe body 10, and the side through hole 21 is a side channel of the float shoe body for automatic grouting and cementing; a bottom through hole 23 is provided on the bottom of the float shoe body 10, and the bottom through hole 23 is a bottom channel of the float shoe body for automatic grouting and cementing.

[0020] The upper support plate 11, the middle support plate 13 and the lower support plate 7 are arranged in the floating shoe body 10 from top to bottom, wherein the upper support plate 11 can realize the positioning of the floating ball 3 after it moves upward; the middle support plate 13 is used for the initial positioning of the floating ball 3 and the connection with the gravity ball 20; the lower support plate 7 is a movable support plate, which provides the channel required for automatic grouting and cementing by moving up and down. Specifically, the upper support plate 11 and the middle support plate 13 are fixed on the inner wall of the floating shoe body 10 by the upper support plate fixing pin 12 and the middle support plate fixing pin 15 respectively, and the lower support plate 7 is movably arranged in the floating shoe body 10. An upper through hole 1 is formed on the upper support plate 11, and the upper through hole 1 is an upper support plate channel for automatic grouting and cementing circulation; a middle through hole 14 is formed on the middle support plate 13, and the middle through hole 14 is a middle support plate channel for automatic grouting and cementing circulation; a lower support plate through hole 19 is formed on the lower support plate 7, and the lower support plate through hole 19 is a lower support plate channel for automatic grouting and cementing circulation.

[0021] The specific structure of the lower support plate 7 that is movably arranged in the float shoe body 10 of the present application is as follows: the upper surface of the lower support plate 7 is connected to the float connecting rod 5, and the float connecting rod 5 is sleeved with a first compression spring 6; the upper end of the float connecting rod 5 passes through the float positioning hole of the middle support plate 13 and is connected to the float 3 through the float shear pin 4, and the float 3 is located directly below the upper through hole 1 and initially abuts against the float positioning hole. The float shear pin 4 is initially used to fix the float 3, and when subjected to tension, it can be sheared off to achieve the separation of the float 3 and the float connecting rod 5; the float connecting rod 5 is used to connect and fix the float 3, so that the float 3 does not affect the automatic grouting process when the float shoe is lowered; one end of the first compression spring 6 is connected to the lower support plate 7, and the other end is connected to the lower surface of the float 3. After the float pin is sheared, the first compression spring 6 provides elastic force to the float 3, so that the float 3 moves along the directional guide rail 2. The directional guide rail 2 is composed of four support rods arranged between the upper support plate 11 and the middle support plate 13. The four support rods are symmetrically arranged around the float 3 and are used to orient the float 3. When the float pin is sheared, it moves along the track to the upper through hole 1 under the action of the first compression spring 6, closes the through hole, and prevents cement from flowing back into the casing.

[0022] The lower surface of the middle support plate 13 is connected to the gravity ball connecting rod 16, and the lower end of the gravity ball connecting rod 16 passes through the lower support plate through hole 19 and is connected to the gravity ball 20 through the gravity ball shear pin 18. The gravity ball 20 is initially against the lower support plate through hole 19; a second compression spring 17 is also provided between the lower support plate 7 and the middle support plate 13. The second compression spring 17 is located on both sides of the gravity ball connecting rod 16, and the second compression spring 17 provides elastic force for the movement of the lower support plate 7. The gravity ball shear pin 18 is initially used to fix the gravity ball 20. When subjected to tension, it can be sheared off to achieve the separation of the gravity ball 20 from the gravity ball connecting rod 16, ensuring that the cementing operation is not affected by the gravity ball 20. The shear force of the float shear pin 4 of the present application is less than the shear force of the gravity ball shear pin 18, ensuring that the pins of the float 3 and the gravity ball 20 can be sheared off during the cementing process. During positive pressure application, the lower support plate 7 moves downward, and the gravity ball 20 is sealed with the lower support plate 7 to achieve positive pressure holding, thereby ensuring that the gravity ball shear pin 18 can be sheared off by pressure holding during positive pressure application.

[0023] The present application sets a positioning step 8 below the lower support plate 7, and the positioning step 8 is fixed on the inner wall of the float shoe body 10. When the float ball pin and the gravity ball pin are sheared, a stop step is provided for the lower support plate 7 to prevent the lower support plate 7 from falling to the bottom of the float shoe.

[0024] The present application provides a baffle plate 22 near the bottom of the float shoe body 10, and a baffle plate through hole 9 is provided on the baffle plate 22. After the gravity ball is sheared, the baffle plate 22 can be used to recover the gravity ball 20 and protect the bottom of the float shoe from the impact of the gravity ball falling; the baffle plate through hole 9 is a flow channel of the baffle plate, and its aperture is smaller than the outer diameter of the gravity ball 20.

[0025] The working principle of the utility model is as follows:

[0026] Since the lower support plate 7 is a movable support plate, during the casing installation process, the lower support plate 7 moves upward under the pressure difference between the inside and outside of the casing, compressing the second compression spring 17, so that the lower support plate 7 is separated from the gravity ball 20, and a grouting channel is established from the bottom through hole 23, the side through hole 21 to the lower support plate through hole 19, the middle through hole 14, the float positioning hole, and the upper through hole 1, so as to realize the automatic grouting function. The lower support plate 7 of the present application has a larger area under the liquid pressure, and the automatic grouting process can be better controlled through the lower support plate 7, which is not easy to be blocked.

[0027] When the casing is in place and the cementing is positively pressurized, the lower support plate 7 moves downward to achieve the sealing of the lower support plate through hole 19 and the gravity ball 20. The pressure acts on the lower support plate 7, which is converted into tension on the gravity ball connecting rod 16 and the float connecting rod 5. Since the values ​​of the two shear pins are different, the float pin is sheared first and then the gravity ball pin is sheared, so that the float 3 and the gravity ball 20 are separated from the connecting rod, and a positive channel from the upper through hole 1, the middle through hole 14, and the lower support plate through hole 19 to the bottom through hole 23 / side through hole 21 is established to achieve cementing circulation.

[0028] After cementing is completed, the float 3 is reset under the first compression spring 6, forming a seal with the upper support plate 11 to achieve the back pressure valve function. At this time, there is clean water / cement slurry in the casing and cement outside the casing. There is an internal and external pressure difference, and the float seal can effectively prevent cement from flowing back into the casing.

[0029] The drawings in the present invention are only used for illustrative purposes and represent only schematic diagrams rather than actual drawings, and should not be construed as limitations on this patent. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0030] Although the embodiments of the present invention have been shown and described above, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A variable flow path float shoe, comprising a float shoe body (10), Features: The float shoe body (10) is provided with an upper support plate (11) with an upper through hole (1), a middle support plate (13) with a middle through hole (14), and a lower support plate (7) with a lower support plate through hole (19) in sequence from top to bottom. The lower support plate (7) is movably arranged in the float shoe body (10); a float connecting rod (5) is provided on the lower support plate (7), and the float connecting rod (5) passes through the middle support plate (13) and is connected to the float shear pin (4). The floating ball (3) is connected to the floating ball (3), which is located directly below the upper through hole (1); the floating ball connecting rod (5) is sleeved with a first compression spring (6); the middle supporting plate (13) is connected to the gravity ball connecting rod (16), and the gravity ball connecting rod (16) passes through the lower supporting plate through hole (19) and is connected to the gravity ball (20) through the gravity ball shear pin (18); a second compression spring (17) is provided between the lower supporting plate (7) and the middle supporting plate (13).

2. A variable flow path floating shoe according to claim 1, Features: A directional guide rail (2) is provided between the upper support plate (11) and the middle support plate (13), and the directional guide rail (2) is located around the floating ball (3).

3. A variable flow path floating shoe according to claim 1, Features: A positioning step (8) is provided in the middle of the inner wall of the floating shoe body (10), and the positioning step (8) is located below the lower support plate (7).

4. A variable flow path floating shoe according to claim 1, Features: A bottom through hole (23) is provided at the bottom of the float shoe body (10).

5. A variable flow path floating shoe according to claim 1, Features: The lower side wall of the float shoe body (10) is provided with a side through hole (21).

6. A variable flow path floating shoe according to claim 1, Features: The floating shoe body (10) is provided with a baffle (22) near the bottom, and the baffle (22) is provided with a baffle through hole (9).

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