Drillable casing cement float collar float shoe

Abstract

The present application relates to the technical field of cementing, and proposes a drillable casing cement float collar float shoe, which comprises a shell and an inner thread one arranged on the inner wall of the shell for connecting with external equipment, the inner wall of the shell is provided with a connecting port, the inner wall of the connecting port is provided with an inner thread two, the inner wall of the connecting port is provided with an upper shell, the inner wall of the shell is threadedly connected with a base pipe, and the outer surface of the base pipe is provided with an outer thread two for connecting with external equipment. The present application has a reasonable structure, when the float shoe needs to be used, the shell is threadedly connected with external equipment through the inner thread one, at this time, the upper shell is threadedly connected with the shell through the inner thread two, when the float collar needs to be used, the upper shell is separated from the shell by rotating, then the base pipe is installed by rotating, and the outer thread two is threadedly connected with external equipment, so that the present application only needs to replace one component to complete the conversion of the float collar into the float shoe or the float shoe into the float collar.

Description

Technical Field

[0001] This invention relates to the field of cementing technology, specifically to a drillable casing cement float collar float shoe. Background Technology

[0002] A float shoe or float collar is a type of casing guide shoe or coupling that generates buoyancy. It is an essential piece of equipment in cementing operations. The float shoe is attached to the end of the casing string, and the float collar is attached 20-30 meters away from the end of the casing string. Both the float shoe and the float collar act as back pressure valves to prevent cement slurry from flowing back during cementing operations, thereby ensuring the quality of cementing.

[0003] A known existing patent (publication number CN115306348B) relates to a self-filling float collar / shoe for cementing. Prolonged use at high temperatures in oil wells reduces the elasticity of springs, affecting the seal between the valve core and seat. During cementing, the cement continuously impacts the valve core, causing surface wear and resulting in incomplete contact between the valve core and seat. This self-filling float collar / shoe for cementing includes an outer shell, a support plate fixed inside the shell, a guide shell fixed to the support plate, a valve stem slidably connected to the guide shell, a support plate fixed to the valve stem, a spring plate hinged between the support plate and the guide shell, a valve core fixed to the valve stem via symmetrically distributed folding rods, and a valve seat fixed inside the shell for sealing cooperation with the valve core. This invention uses circumferentially arranged spring plates to avoid the reduction in elasticity of a single spring, thus preventing issues with the seal between the valve core and seat. Furthermore, the protective shell intercepts the cement slurry during cementing, achieving a better sealing effect.

[0004] However, during the implementation of the relevant technology, the following problems were found in the above technical solution: the function of the float hoop and float shoe is consistent, but the float hoop and float shoe have poor versatility and cannot be converted between each other. When one of the float hoop and float shoe is damaged, the user needs to buy a pair of float hoop and float shoe, which increases the cost of use. Summary of the Invention

[0005] This invention proposes a drillable casing cement float hoop and float shoe, which solves the problem that the float hoop and float shoe in related technologies are inconsistent in function, have poor versatility and cannot be converted between each other, and require users to buy a pair of float hoop and float shoe when one of them is damaged, which increases the cost of use.

[0006] The technical solution of the present invention is as follows: a drillable casing cement floating shoe includes a shell and an internal thread one formed on the inner wall of the shell for connecting with external equipment. The inner wall of the shell is provided with a connection port, the inner wall of the connection port is provided with an internal thread two, and the inner wall of the connection port is provided with an upper shell.

[0007] A valve body is fixedly connected to the inner wall of the housing. A water-blocking plate is provided at the bottom of the valve body. A connecting frame is fixedly connected to the inner wall of the valve body. A ball rod is provided inside the connecting frame. A connecting plate is fixedly connected to one end of the ball rod. A spring is provided on one side of the connecting plate. A connecting piece is fixedly connected to the center of one side of the connecting plate. A connecting base block is fixedly connected to one end of the connecting piece. A ball valve that mates with the valve body is provided on the surface of the connecting base block.

[0008] Furthermore, preferably, the upper housing includes an external thread one formed on its surface that mates with an internal thread two, and the connection port is threadedly connected to the upper housing through the internal thread two and the external thread one.

[0009] Furthermore, preferably, the end face of the housing is provided with a sealing gasket 1 for fitting the housing and the upper housing, and the bottom of the inner wall of the connection port is provided with a sealing gasket 2 for sealing, wherein both the sealing gasket 1 and the sealing gasket 2 are high-temperature resistant metal spiral wound gaskets.

[0010] Furthermore, preferably, the connecting frame includes several corrosion-resistant metal rods fixedly connected to the inner wall of the valve body, a connecting ring fixedly connected to one end of the metal rods, and a bearing fixedly connected to the inner wall of the connecting ring, wherein the bearing is fixedly connected to the ball rod.

[0011] Furthermore, preferably, the connecting component includes a sleeve, a limiting groove formed on the inner wall of the sleeve, a limiting slider slidably connected to the inner wall of the limiting groove, a movable rod fixedly connected to one side of the limiting slider, and a spring fixedly connected to one end of the movable rod. The inner wall of the limiting groove is provided with lubricating grease to reduce wear between the limiting groove and the limiting slider.

[0012] Furthermore, preferably, the outer surface of the connecting base block is provided with connecting threads, and one side of the ball valve is provided with a connecting threaded hole that matches the connecting threads.

[0013] Furthermore, preferably, the water-blocking plate is made of resilient polytetrafluoroethylene.

[0014] A drillable casing cement floating hoop includes the above-mentioned technical solution, wherein the inner wall of the shell is threadedly connected to a base pipe, and the outer surface of the base pipe is provided with an external thread for connecting to external equipment.

[0015] Furthermore, preferably, the diameter of the base tube is smaller than that of the shell, and the base tube and the shell are concentrically arranged.

[0016] Furthermore, preferably, the surfaces of the housing, the upper housing, and the base tube are all coated with protective paint, and the colors of the protective paints on the upper housing and the base tube are different.

[0017] The working principle and beneficial effects of this invention are as follows:

[0018] The present invention has a reasonable structure. When the floating shoe is needed, the shell is threaded to the external equipment through the first internal thread, and the upper shell is threaded to the shell through the second internal thread. When the floating hoop is needed, the upper shell is rotated to separate it from the shell. Then, the upper base tube is installed by rotation, and then it is threaded to the external equipment through the second external thread. This invention only requires the replacement of one component to complete the conversion of the floating hoop into a floating shoe or the floating shoe into a floating hoop.

[0019] The present invention has a reasonable structure. The sealing gasket 1 and the sealing gasket 2 increase the sealing performance of the two and prevent mud and water from leaking through the connection gap. The upper shell and the shell are connected by threads, which facilitates disassembly and increases its versatility.

[0020] 3. The present invention has a reasonable structure. When the ball valve is damaged, the operator can rotate the ball valve to separate it from the connecting base block, which makes it easy to replace the ball valve with a new one and reduces costs. Attached Figure Description

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0022] Figure 1 This is a schematic diagram of a three-dimensional structure of a drillable casing cement floating shoe proposed in this invention;

[0023] Figure 2 This is a schematic diagram of the cross-sectional structure of a drillable casing cement floating shoe proposed in this invention.

[0024] Figure 3 for Figure 2 Enlarged structural diagram at point A in the middle;

[0025] Figure 4 This is a schematic diagram of the cross-sectional structure of the connecting component in a drillable casing cement floating shoe proposed in this invention.

[0026] Figure 5 This is a schematic diagram of a three-dimensional structure of a drillable casing cement floating hoop proposed in this invention;

[0027] In the diagram: 1. Housing; 2. Upper housing; 3. Sealing gasket 1; 4. Internal thread 1; 5. Water-blocking plate; 6. Valve body; 7. Connecting frame; 8. Ball rod; 9. Connecting piece; 901. Sleeve; 902. Movable rod; 903. Limiting slider; 904. Limiting groove; 905. Spring 1; 10. Spring 2; 11. Ball valve; 12. Connecting base block; 13. Connecting plate; 14. Sealing gasket 2; 15. Base tube; 16. Internal thread 2; 17. External thread 1; 18. External thread 2. Detailed Implementation

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0029] Please see Figures 1-5 The present invention provides a drillable casing cement floating shoe technical solution: including a shell 1 and an internal thread 4 opened on the inner wall of the shell 1 for connecting with external equipment. The inner wall of the shell 1 is provided with a connection port, the inner wall of the connection port is provided with an internal thread 16, and the inner wall of the connection port is provided with an upper shell 2.

[0030] A valve body 6 is fixedly connected to the inner wall of the housing 1. A water-blocking plate 5 is provided at the bottom of the valve body 6. A connecting frame 7 is fixedly connected to the inner wall of the valve body 6. A ball rod 8 is provided inside the connecting frame 7. A connecting plate 13 is fixedly connected to one end of the ball rod 8. A spring 10 is provided on one side of the connecting plate 13. A connecting piece 9 is fixedly connected to the center of one side of the connecting plate 13. A connecting base block 12 is fixedly connected to one end of the connecting piece 9. A ball valve 11 that cooperates with the valve body 6 is provided on the surface of the connecting base block 12.

[0031] The housing 1 is threaded to the external equipment via internal thread 4, and the upper housing 2 is threaded to the housing 1 via internal thread 16. When the mud is extracted, the mud water is diverted by the water baffle 5, thereby achieving the effect of blocking water and preventing most of the mud water from directly approaching the ball valve 11, which would reduce the service life of the ball valve 11. The mud water causes the ball valve 11 to move under force and the connecting part 9 to contract, thereby squeezing the spring 10 and extracting the mud water. When the force on the ball valve 11 is less than the force of the spring 10, the spring 10 resets the ball valve 11. When the mud backflows, the ball valve 11 and the valve body 6 are combined to prevent the mud water from backflowing.

[0032] Specifically, the upper housing 2 includes an external thread 17 that mates with the internal thread 16 on its surface. The connection port is threadedly connected to the upper housing 2 through the internal thread 16 and the external thread 17. The end face of the housing 1 is provided with a sealing gasket 3 for mating with the housing 1 and the upper housing 2. The bottom of the inner wall of the connection port is provided with a sealing gasket 14 for sealing. Both the sealing gasket 3 and the sealing gasket 14 are high-temperature resistant metal spiral wound gaskets. The model of the metal spiral wound gasket is: MiFSO-240, and its full name is: inner ring metal spiral wound gasket.

[0033] By providing a sealing gasket 3 between the upper housing 2 and the housing 1, the sealing performance of the two is increased, preventing mud and water from leaking through the connection gap. The upper housing 2 and the housing 1 are connected by threads, which facilitates disassembly and increases the versatility of the structure.

[0034] Specifically, the connecting frame 7 includes several corrosion-resistant metal rods fixedly connected to the inner wall of the valve body 6, a connecting ring fixedly connected to one end of the metal rods, and a bearing fixedly connected to the inner wall of the connecting ring. The bearing is fixedly connected to the ball rod 8. The connecting component 9 includes a sleeve 901, a limiting groove 904 opened on the inner wall of the sleeve 901, a limiting slider 903 slidably connected to the inner wall of the limiting groove 904, a movable rod 902 fixedly connected to one side of the limiting slider 903, and a spring 905 fixedly connected to one end of the movable rod 902. The inner wall of the limiting groove 904 is provided with lubricating grease to reduce wear between the limiting groove 904 and the limiting slider 903.

[0035] The ball valve 11 is connected to the ball rod 8 via a bearing, which facilitates its rotation. When the ball valve 11 is subjected to force, it will move in conjunction with the movable rod 902 via the connecting base block 12, causing the limiting slider 903 to slide within the limiting groove 904 and compress the first spring 905, causing it to deform. When the force on the ball valve 11 is less than that of the first spring 905 and the second spring 10, the ball valve 11 will be mechanically reset by the inherent properties of the two springs.

[0036] Specifically, the outer surface of the connecting base block 12 is provided with connecting threads, one side of the ball valve 11 is provided with a connecting screw hole that matches the connecting threads, and the water blocking plate 5 is made of resilient polytetrafluoroethylene.

[0037] When ball valve 11 is damaged, it can be rotated to separate it from the connecting base block 12, making it easier to replace with a new ball valve 11.

[0038] Please see Figure 5 A drillable casing cement floating hoop technology is provided, including the above technical solution. The inner wall of the shell 1 is threadedly connected to the base pipe 15. The outer surface of the base pipe 15 is provided with an external thread 18 for connecting with external equipment. The diameter of the base pipe 15 is smaller than that of the shell 1, and the base pipe 15 and the shell 1 are concentrically arranged.

[0039] By rotating the upper housing 2 to separate it from the housing 1, and then by rotating and installing the base tube 15, and then by threading it to the external equipment through the external thread 18, this application only needs to replace one component to complete the conversion of the float hoop into a float shoe or the float shoe into a float hoop.

[0040] Specifically, the surfaces of the shell 1, the upper shell 2, and the base tube 15 are all coated with protective paint, and the colors of the protective paints on the upper shell 2 and the base tube 15 are different.

[0041] The upper shell 2 is blue, the base tube 15 is yellow, and the shell 1 is red. The different colors make it easier for staff to distinguish and differentiate them.

[0042] In this invention, all components are coated with anti-rust paint, and the surface of the anti-rust paint is coated with a corrosion-resistant layer. Specifically, the anti-rust paint is a zinc-rich primer, and the corrosion-resistant layer is a nickel-based alloy composite coating, which can prevent the components from corroding and rusting due to long-term exposure to moisture.

[0043] In summary, its beneficial effects are as follows:

[0044] When the floating shoe is needed, the housing 1 is threaded to the external equipment through the internal thread 4. At this time, the upper housing 2 is threaded to the housing 1 through the internal thread 16. When the floating hoop is needed, the upper housing 2 is rotated to separate it from the housing 1. Then, the upper base pipe 15 is installed by rotation and then threaded to the external equipment through the external thread 18. This application only requires the replacement of one component to complete the conversion of the floating hoop into a floating shoe or the floating shoe into a floating hoop.

[0045] The working principle and usage process of this invention are as follows: 1. When floating shoes are needed, the housing 1 is threadedly connected to the external equipment through the internal thread 4. At this time, the upper housing 2 is threadedly connected to the housing 1 through the internal thread 16. 2. When floating hoops are needed, the upper housing 2 is rotated to separate it from the housing 1. Then, the upper base pipe 15 is installed by rotation and then threadedly connected to the external equipment through the external thread 18. This application only requires the replacement of one component to complete the conversion of the floating hoop into a floating shoe or the floating shoe into a floating hoop. By providing a sealing gasket 3 between the upper housing 2 and the housing 1, the sealing performance of the two is increased to prevent mud and water from leaking from the connection gap. The upper housing 2 and the housing 1 are connected by threads, which facilitates disassembly and increases its versatility. The upper housing 2 is blue, the base pipe 15 is yellow, and the housing 1 is red. The different colors make it easy for workers to distinguish and differentiate them.

[0046] When the mud is pumped out, the mud water is diverted by the water-blocking plate 5, thereby achieving the effect of blocking water and preventing most of the mud water from directly approaching the ball valve 11, which would reduce the service life of the ball valve 11. The mud water causes the ball valve 11 to move under force, and the connecting base block 12 links the movable rod 902 to make the limiting slider 903 slide in the limiting groove 904, and squeeze the spring 1 905, causing it to deform. When the force on the ball valve 11 is less than that of the spring 1 905 and the spring 2 10, the mechanical energy of the ball valve 11 is reset by the physical properties of the two. When the mud backflows, the ball valve 11 and the valve body 6 are combined to prevent the mud water from backflowing.

[0047] When ball valve 11 is damaged, the operator can rotate ball valve 11 to separate it from the connecting base block 12, making it easier to replace with a new ball valve 11.

[0048] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A drillable casing cement float shoe, comprising a housing (1) and an internal thread (4) formed on the inner wall of the housing (1) for connecting with external equipment, characterized in that, The inner wall of the housing (1) is provided with a connection port, the inner wall of the connection port is provided with an internal thread (16), and the inner wall of the connection port is provided with an upper housing (2). A valve body (6) is fixedly connected to the inner wall of the housing (1). A water-blocking plate (5) is provided at the bottom of the valve body (6). A connecting frame (7) is fixedly connected to the inner wall of the valve body (6). A ball rod (8) is provided inside the connecting frame (7). A connecting plate (13) is fixedly connected to one end of the ball rod (8). A spring (10) is provided on one side of the connecting plate (13). A connecting piece (9) is fixedly connected to the center of one side of the connecting plate (13). A connecting base block (12) is fixedly connected to one end of the connecting piece (9). A ball valve (11) that cooperates with the valve body (6) is provided on the surface of the connecting base block (12). The end face of the housing (1) is provided with a sealing gasket (3) for fitting the housing (1) and the upper housing (2), and the bottom of the inner wall of the connection port is provided with a sealing gasket (14) for sealing. Both the sealing gasket (3) and the sealing gasket (14) are high temperature resistant metal spiral wound gaskets. The connecting frame (7) includes several corrosion-resistant metal rods fixedly connected to the inner wall of the valve body (6), a connecting ring fixedly connected to one end of the metal rods, and a bearing fixedly connected to the inner wall of the connecting ring. The bearing is fixedly connected to the ball rod (8). The connector (9) includes a sleeve (901), a limiting groove (904) formed on the inner wall of the sleeve (901), a limiting slider (903) slidably connected to the inner wall of the limiting groove (904), a movable rod (902) fixedly connected to one side of the limiting slider (903), and a spring (905) fixedly connected to one end of the movable rod (902). The inner wall of the limiting groove (904) is provided with lubricating grease to reduce wear between the limiting groove (904) and the limiting slider (903).

2. The drillable casing cement float shoe according to claim 1, characterized in that, The upper housing (2) includes an external thread (17) that is formed on its surface and engages with an internal thread (16). The connection port is threadedly connected to the upper housing (2) through the internal thread (16) and the external thread (17).

3. The drillable casing cement float shoe according to claim 1, characterized in that, The outer surface of the connecting base block (12) is provided with connecting threads, and one side of the ball valve (11) is provided with a connecting thread hole that matches the connecting threads.

4. The drillable casing cement float shoe according to claim 1, characterized in that, The water-blocking plate (5) is made of polytetrafluoroethylene, which has toughness.

5. A drillable casing cement float hoop, comprising the drillable casing cement float shoe as described in claim 1, characterized in that, The inner wall of the housing (1) is threaded with a base tube (15), and the outer surface of the base tube (15) is provided with an external thread (18) for connecting with external equipment.

6. A drillable casing cement float hoop according to claim 5, characterized in that, The diameter of the base tube (15) is smaller than that of the shell (1), and the base tube (15) and the shell (1) are concentrically arranged.

7. A drillable casing cement float hoop according to claim 5, characterized in that, The surfaces of the shell (1), the upper shell (2) and the base tube (15) are all coated with protective paint, and the colors of the protective paints on the upper shell (2) and the base tube (15) are different.

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