Piston type float collar float shoe with high sealing performance

Abstract

The utility model discloses a piston type float collar float shoe with high sealing performance, which belongs to the technical field of well cementation and comprises a device body, the device body is hollow, and an inner valve is arranged in the device body. Through a movable plate and a vertical plate in the sealing assembly, the movable plate is located below the step, slurry can be blocked when the slurry is poured into the lower end space of the inner valve body to jack up the piston, the slurry can be prevented from making contact with the step, and the accuracy of the ascending and descending positions of the piston body every time is guaranteed; meanwhile, the problem that the closing effect between the sealed space and the sealing piece is affected due to the fact that the mud flowing path is affected by the fact that the position of the piston body is not accurate and mud is attached to the sealed space is solved; by means of the groove body and the screw rod in the vertical rod, the piston body can spirally ascend every time the piston body ascends, slurry on the inner wall of the inner valve body is squeezed out in the direction of the circulation hole in this way, and slurry residues in the inner valve body are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of well cementing, in particular to a piston-type floating collar and floating shoe with high sealing performance. Background Art

[0002] Cementing, the process of running casing into a well and injecting cement into the annular space between the wellbore and the casing, is an essential step in the drilling and completion process. It includes running casing and injecting cement. Cementing technology is a multidisciplinary, integrated application characterized by systematic, one-time, and short processing times. The primary purpose of cementing is to protect and support the casing in oil and gas wells and to isolate oil, gas, and water formations.

[0003] After searching, the Chinese patent "Piston type floating collar and floating shoe" authorization announcement number is "CN204738782U". This utility model discloses a piston type floating collar and floating shoe, including a device body and an inner valve. The inner valve is hollow to form an inner cavity and its bottom is closed by a orifice plate, and a drainage hole is provided on the orifice plate; the upper section of the inner valve is sealed with the device body, and the outer diameter of its lower section is smaller than the inner diameter of the device body; the diameter of the inner cavity of the upper and lower sections of the inner valve is smaller than the inner cavity of the upper section at the connection; a piston that can slide freely is provided in the inner cavity of the lower section of the inner valve, the piston is sealed with the inner cavity, and a spring is provided between it and the orifice plate; an annular protrusion is provided at the upper edge of the piston; an annular groove for accommodating the annular protrusion is provided at the top of the inner cavity of the lower section of the inner valve; an axial sealing device is also provided in the annular groove; the lower section of the inner valve is provided with a plurality of circulation holes along its circumference near the connection with the upper section; when the piston is closed, the circulation hole is closed. The piston-type floating collar and floating shoe hides the sealing element outside the mud circulation channel and will not be eroded, thereby greatly improving the service life of the floating collar and floating shoe.

[0004] Although the above-mentioned floating collar and floating shoe utilize the piston to close the circulation hole to prevent the sealing element from being eroded by mud, there is a disadvantage: a limit step is provided in the inner valve, which can be used to limit the position of the piston each time it moves down and resets. Each time the piston moves up, it is lifted up by the mud in the inner valve. Therefore, the mud fills the lower space of the inner valve and is likely to remain on the limit step during discharge, causing the piston to be padded by the mud when it is reset. In this case, the protruding part of the piston will block the flow path of the mud, causing disorderly flow of the mud, increasing the risk of mud contacting the sealed space during circulation, resulting in residual mud in the sealed space and the seal, affecting the subsequent closing effect of the seal and the sealed space.

[0005] Based on this, the utility model designs a piston-type floating collar and floating shoe with high sealing performance to solve the above problems. Utility Model Content

[0006] In view of the above-mentioned shortcomings of the prior art, the utility model provides a piston-type floating collar and floating shoe with high sealing performance.

[0007] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] A highly sealing piston-type floating collar and floating shoe comprises a device body, wherein the device body is hollow and an internal valve is provided in the device body;

[0009] The inner valve member comprises an inner valve body fixed in the device body, a flow hole and a return hole are respectively opened on the surface of the inner valve body, and a step is opened in the inner valve body;

[0010] a sealing assembly, the sealing assembly being disposed in an inner valve body of the inner valve member;

[0011] The sealing assembly includes a movable plate movable in the inner valve body, the movable plate is located below the step, a vertical rod is integrally connected to the upper portion of the movable plate, the upper end of the vertical rod is fixedly connected to the piston body, the vertical rod is slotted, a spiral rod is provided in the vertical rod, the thread of the spiral rod is adapted to the slot of the vertical rod, and the lower end of the spiral rod is fixedly connected to the inner bottom of the inner valve body;

[0012] Furthermore, a bearing seat is fixedly connected to the lower side of the movable plate, and a movable plate is fixedly connected to the lower side of the bearing seat;

[0013] Furthermore, a spring is fixedly connected to the bottom of the movable plate, and the lower end of the spring is fixedly connected to the inner bottom of the inner valve body;

[0014] Furthermore, the spiral rod is located in a spring, and the spring is of a retractable design.

[0015] Furthermore, a sealing groove is provided on the inner top of the inner valve body, and a sealing ring is fixedly connected to the top of the piston body, and the sealing ring is adapted to the sealing groove.

[0016] Furthermore, the lower side of the piston body contacts the step, and the height of the piston body is close to the height of the step and the flow hole.

[0017] Furthermore, the piston body is made of rubber, and the surface of the piston body fits the inner wall of the inner valve body.

[0018] Furthermore, six circulation holes are provided in a circular array, and the shape of the circulation holes is elliptical. Beneficial effects

[0019] The first section: through the movable plate and the vertical plate in the sealing assembly, the movable plate is located below the step, which can block the mud when the mud is poured into the lower end space of the inner valve body to push up the piston, and prevent the mud from contacting the step to ensure the accuracy of the rising and falling position of the piston body each time. At the same time, it also avoids the problem of affecting the mud flow path due to the misalignment of the piston body position, causing the mud to adhere to the sealed space and affecting the closing effect between the sealed space and the seal.

[0020] The second section: through the groove body and the spiral rod in the vertical rod, each time the piston body is raised, it can spirally rise, and in this way, the mud on the inner wall of the inner valve body is squeezed out toward the flow hole, reducing the mud residue in the inner valve body. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be derived from these drawings without inventive effort.

[0022] Figure 1 The utility model is a high-sealing piston type floating collar floating shoe main body structure three-dimensional Figure 1 ;

[0023] Figure 2 This is a schematic diagram of the internal structure of a device body of a high-sealing piston-type floating collar and floating shoe of the utility model;

[0024] Figure 3 This is a structural diagram of an inner valve component of a high-sealing piston-type floating collar and floating shoe of the utility model;

[0025] Figure 4 This is a high-sealing piston type floating collar and floating shoe. Figure 3 A schematic diagram of the structure at point A in the middle;

[0026] Figure 5 This is a schematic diagram of the internal structure of the inner valve body of a high-sealing piston-type floating collar and float shoe of the utility model;

[0027] The numbers in the figure represent:

[0028] 1. Device body; 2. Internal valve component; 21. Internal valve body; 22. Flow hole; 23. Return hole; 24. Step; 25. Sealing groove; 3. Sealing assembly; 31. Piston body; 32. Vertical rod; 33. Moving plate; 34. Bearing seat; 35. Movable plate; 36. Spring; 37. Screw rod; 38. Sealing ring. DETAILED DESCRIPTION

[0029] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0030] The present invention will be further described below with reference to the embodiments.

[0031] In some embodiments, please refer to the appendix of the specification. Figure 1-5 A highly sealing piston-type floating collar float shoe includes a device body 1, which is hollow and has an inner valve member 2 disposed therein; the inner valve member 2 includes an inner valve body 21 fixed to the device body 1, a surface of the inner valve body 21 having a flow hole 22 and a return hole 23, and a step 24 disposed therein; and a sealing assembly 3 disposed within the inner valve body 21 of the inner valve member 2.

[0032] In the embodiment of the present utility model, the sealing assembly 3 includes a movable plate 33 that is movable in the inner valve body 21. The movable plate 33 is located below the step 24. A vertical rod 32 is integrally connected to the top of the movable plate 33. The upper end of the vertical rod 32 is fixedly connected to the piston body 31. The vertical rod 32 is grooved. A spiral rod 37 is provided in the vertical rod 32. The thread of the spiral rod 37 is adapted to the groove of the vertical rod 32. The lower end of the spiral rod 37 is fixedly connected to the inner bottom of the inner valve body 21. When the mud enters the inner valve body 21 from the device body 1, the piston body 31 intercepts the mud, and then the mud enters the lower section of the device body 1 through the flow hole 22. When the mud stops supplying, the pressure in the device body 1 is greater than the pressure in the inner valve body 21. At this time, the mud enters the inner valve body 21 through the reflux hole 23 and squeezes the movable plate 33. When the piston body 31 moves upward, the mud on the inner wall of the inner valve body 21 can be squeezed out from the flow hole 22 in a spiral manner to reduce the mud residue in the inner valve body 21. After the piston body 31 moves up to a certain position, the sealing ring 38 enters the sealing groove 25, and the piston body 31 will completely block the flow hole 22, and the mud will be completely intercepted. Since the distance between the movable plate 33 and the movable plate 35 is consistent with the height of the piston, when the piston rises into place, the movable plate 33 is just below the step 24, which can block the mud.

[0033] In the embodiment of the present invention, a bearing seat 34 is fixedly connected to the bottom of the movable plate 33, and a movable plate 35 is fixedly connected to the bottom of the bearing seat 34. The bearing seat 34 cooperates with the movable plate 35 to limit the position of the movable plate 33 and enable the movable plate 33 to follow the vertical rod 32 and drive the piston body 31 to spirally rotate and rise.

[0034] In the embodiment of the present utility model, a spring 36 is fixedly connected to the bottom of the movable plate 35, and the lower end of the spring 36 is fixedly connected to the inner bottom of the inner valve body 21; the spring 36 can not only limit the angle of the movable plate 35, but also can be used to reset the piston body 31;

[0035] In the embodiment of the present invention, the screw

[0036] The rotating rod 37 is located in the spring 36, and the spring 36 is a retractable design;

[0037] In the embodiment of the present utility model, a sealing groove 25 is formed on the inner top of the inner valve body 21, and a sealing ring 38 is fixedly connected to the upper part of the piston body 31. The sealing ring 38 is adapted to the sealing groove 25. By cooperating with the sealing ring 38 in the sealing groove 25, the piston body 31 can completely block the mud flow path between the device body 1 and the inner valve body 21, thereby improving the sealing effect.

[0038] In the embodiment of the present invention, the lower portion of the piston body 31 contacts the step 24 , and the height of the piston body 31 is close to the height of the step 24 and the flow hole 22 ;

[0039] In the embodiment of the present utility model, the piston body 31 is made of rubber, and the surface of the piston body 31 fits the inner wall of the inner valve body 21;

[0040] In the embodiment of the present invention, six flow holes 22 are provided in a circular array, and the shape of the flow holes 22 is elliptical.

[0041] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A highly sealing piston-type floating collar and floating shoe, comprising a device body (1), characterized in that: The device body (1) is hollow, and an internal valve component (2) is provided in the device body (1); The inner valve member (2) comprises an inner valve body (21) fixed in the device body (1), a flow hole (22) and a return hole (23) are respectively provided on the surface of the inner valve body (21), and a step (24) is provided in the inner valve body (21); A sealing assembly (3), wherein the sealing assembly (3) is arranged in an inner valve body (21) of the inner valve member (2); The sealing assembly (3) includes a movable plate (33) movable in the inner valve body (21), the movable plate (33) being located below the step (24), a vertical rod (32) being integrally connected to the upper portion of the movable plate (33), the upper end of the vertical rod (32) being fixedly connected to the piston body (31), the vertical rod (32) being slotted, a spiral rod (37) being provided in the vertical rod (32), the thread of the spiral rod (37) being adapted to the slot of the vertical rod (32), and the lower end of the spiral rod (37) being fixedly connected to the inner bottom of the inner valve body (21).

2. The high-sealing piston-type floating collar and floating shoe according to claim 1 is characterized in that: A bearing seat (34) is fixedly connected below the movable plate (33), and a movable plate (35) is fixedly connected below the bearing seat (34).

3. The high-sealing piston-type floating collar and floating shoe according to claim 2 is characterized in that: A spring (36) is fixedly connected below the movable plate (35), and the lower end of the spring (36) is fixedly connected to the inner bottom of the inner valve body (21).

4. The high-sealing piston-type floating collar and floating shoe according to claim 1 is characterized in that: The spiral rod (37) is located in the spring (36), and the spring (36) is of a retractable design.

5. The high-sealing piston-type floating collar and floating shoe according to claim 1 is characterized in that: A sealing groove (25) is provided on the inner top of the inner valve body (21), and a sealing ring (38) is fixedly connected to the upper side of the piston body (31), wherein the sealing ring (38) is adapted to the sealing groove (25).

6. The high-sealing piston-type floating collar and floating shoe according to claim 1 is characterized in that: The lower portion of the piston body (31) contacts the step (24), and the height of the piston body (31) is close to the height of the step (24) and the flow hole (22).

7. The high-sealing piston-type floating collar and floating shoe according to claim 1 is characterized in that: The piston body (31) is made of rubber, and the surface of the piston body (31) fits in contact with the inner wall of the inner valve body (21).

8. The highly sealing piston-type floating collar and floating shoe according to claim 1, characterized in that: Six circulation holes (22) are provided in a ring array, and the shape of the circulation holes (22) is elliptical.

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