Double acting erosion shoe

Abstract

This invention relates to a dual-acting anti-erosion float shoe, comprising a body, which is a tubular structure. Inside the body, from top to bottom, are a pressure-transmitting sleeve, a flip-top float valve, and a spring float valve. The opening or closing of the flip-top float valve and the spring float valve allows for unobstructed or closed operation of the body's interior. The flip-top float valve includes an upper valve seat and a flip-top. The upper valve seat is fixedly and sealed to the inner wall of the body, while the flip-top is rotatably connected to the upper valve seat. The flip-top is connected to the upper valve seat via a torsion spring, causing it to flip under the action of the torsion spring and tightly fit against the upper valve seat, thereby closing the flip-top float valve. It also includes a pressure-bearing seat, fixedly installed on the inner wall of the pressure-transmitting sleeve. The pressure-bearing seat is an axially through-structure, and a piston is sealed and installed on its inner wall. The piston is an axially through-type boss structure, whose small-diameter end can axially and sealingly pass through the upper valve seat, overcoming the torsion force of the torsion spring and forcing the flip-top to rotate and disengage from the upper valve seat, thus opening the flip-top float valve. This invention improves the float shoe's anti-erosion and back pressure resistance performance.

Description

Technical Field

[0001] This invention belongs to the field of oil and gas cementing tools technology, and particularly relates to a dual-action anti-erosion float shoe. Background Technology

[0002] Float shoes, as cementing accessories, play a crucial role in cementing operations. Their backpressure valve safety and reliability are essential for ensuring the safety of cementing operations. Typically, to improve cementing safety, one set of float shoes is used in conjunction with two sets of float collars to maximize backpressure resistance. However, with the continuous increase in drilling depth, drilling volume, and circulation time, the backpressure resistance of float collars and float shoes faces significant challenges. Even with a combination of two collars and one float shoe, float valve failure due to erosion cannot be completely avoided. Therefore, to address these issues, it is necessary to research a dual-action float shoe that can improve erosion resistance. Summary of the Invention

[0003] The technical problem solved by this invention is achieved through the following technical solution:

[0004] A dual-action anti-erosion floating shoe includes a body, which is a tubular structure. Inside the body, a pressure transmission sleeve, a flip-top floating valve, and a spring floating valve are installed sequentially from top to bottom. The opening or closing of the flip-top floating valve and the spring floating valve enables the interior of the body to be unobstructed or closed.

[0005] The flip-top float valve includes an upper valve seat and a flip cover. The upper valve seat is fixedly and sealed to the inner wall of the main body. The flip cover is rotatably connected to the upper valve seat, and the flip cover is connected to the upper valve seat through a torsion spring, so that the flip cover flips under the action of the torsion spring and fits tightly against the upper valve seat, thereby closing the flip-top float valve.

[0006] It also includes a pressure seat, which is fixedly installed on the inner wall of the pressure transmission sleeve. The pressure seat is an axially through structure. A piston is sealed and installed on the inner wall of the pressure seat. The piston is an axially through boss structure. Its small diameter end can axially seal through the upper valve seat, overcome the torsion force of the torsion spring, force the flip cover to rotate and disengage from the upper valve seat, so that the flip cover float valve opens.

[0007] Furthermore, the spring float valve includes a lower valve seat, a lower valve, a spring, and a spring seat. The lower valve seat and the spring seat are installed sequentially from top to bottom on the inner wall of the main body. One end of the lower valve can seal through the spring seat, and the other end can seal in contact with the lower valve seat, thereby closing the spring float valve.

[0008] Furthermore, the contact end between the lower valve and the lower valve seat has an arc-shaped structure, and a first sealing anti-wear sleeve is fixedly embedded on its surface. The first sealing anti-wear sleeve can fit with the second sealing anti-wear sleeve fixed on the lower valve seat to achieve a seal.

[0009] Furthermore, the impact seat is an axially through structure, and the opening of the impact seat near the upstream end of the body forms a constriction structure, so that the liquid entering the cavity produces an impact effect.

[0010] Furthermore, the outer wall of the pressure-transmitting sleeve is provided with several semi-circular pressure-transmitting holes along the axial direction.

[0011] Furthermore, the lower valve seat has a circumferential structure of alternating bosses and grooves on the end face near the flip-top float valve.

[0012] Furthermore, it also includes a shoe guide toe, which is provided with several through drainage holes, and the shoe guide toe is fixedly connected to the lower end of the main body.

[0013] Furthermore, the pressure transmission sleeve is coaxially assembled with the inner surface of the main body using a clearance fit, and the lower end face of the pressure-contacting seat and the pressure transmission sleeve is in contact with the upper surface of the upper valve seat.

[0014] Furthermore, a retaining ring with an opening is fixedly installed on the inner wall of the main body, and the upper end face of the pressure transmission sleeve is limited by the retaining ring with an opening.

[0015] The advantages and positive effects of this invention are:

[0016] This invention combines a spring-loaded float valve with a flip-top float valve. During normal circulation or cementing operations, only the spring-loaded float valve is active, while the flip-top float valve is concealed by a special mechanism to prevent erosion caused by circulation. After cementing is completed, the flip-top float valve is closed to achieve back pressure resistance. At the same time, the spring-loaded float valve adopts a special anti-wear and anti-erosion process technology to improve the erosion resistance of the valve body and enhance the erosion resistance and back pressure resistance of the float shoe. Attached Figure Description

[0017] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that these drawings are designed for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, unless specifically indicated, these drawings are intended only to conceptually illustrate the structural construction described herein and are not necessarily drawn to scale.

[0018] Figure 1 This is a cross-sectional view of a dual-action anti-erosion floating shoe provided in an embodiment of the present invention;

[0019] Figure 2 A cross-sectional view of the application structure of a dual-action anti-erosion floating shoe provided in an embodiment of the present invention;

[0020] Figure 3 This is a cross-sectional view of the pressure transmission sleeve of a dual-action anti-erosion floating shoe provided in an embodiment of the present invention;

[0021] Figure 4 for Figure 3The right view;

[0022] Figure 5 This is a structural end face view of the perforated retaining ring of a dual-action anti-erosion floating shoe provided in an embodiment of the present invention;

[0023] Figure 6 This is a front view of the flap structure of a dual-action anti-erosion floating shoe provided in an embodiment of the present invention;

[0024] Figure 7 for Figure 6 The left view;

[0025] Figure 8 A top view of the upper valve seat of a dual-acting anti-erosion float shoe provided in an embodiment of the present invention;

[0026] Figure 9 for Figure 8 AA-direction cross section; Detailed Implementation

[0027] First, it should be noted that the specific structure, features, and advantages of the present invention will be described in detail below by way of examples. However, all descriptions are for illustrative purposes only and should not be construed as limiting the present invention in any way. Furthermore, any single technical feature described or implied in the embodiments mentioned herein, or any single technical feature shown or implied in the accompanying drawings, can still be arbitrarily combined or deleted among these technical features (or their equivalents) to obtain more other embodiments of the present invention that may not be directly mentioned herein. Additionally, for the sake of simplifying the drawings, the same or similar technical features may be indicated only in one place in the same drawing.

[0028] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed during use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0029] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0030] like Figures 1 to 9This embodiment provides a dual-action anti-erosion floating shoe, including a body, a pressure transmission sleeve, a flip-top, a set screw, and a shoe toe. The body is a tubular structure, and the pressure transmission sleeve, the flip-top floating valve, and the spring floating valve are installed inside it from top to bottom. The opening or closing of the flip-top floating valve and the spring floating valve realizes the unobstructed or closed internal flow of the body.

[0031] The flip-top float valve includes an upper valve seat and a flip cover. The upper valve seat is fixedly and sealed to the inner wall of the main body. The flip cover is rotatably connected to the upper valve seat, and the flip cover is connected to the upper valve seat through a torsion spring, so that the flip cover flips under the action of the torsion spring and fits tightly against the upper valve seat, thereby closing the flip-top float valve.

[0032] It also includes a pressure seat, which is fixedly installed on the inner wall of the pressure transmission sleeve. The pressure seat is an axially through structure. A piston is sealed and installed on the inner wall of the pressure seat. The piston is an axially through boss structure. Its small diameter end can axially seal through the upper valve seat, overcome the torsion force of the torsion spring, force the flip cover to rotate and disengage from the upper valve seat, so that the flip cover float valve opens.

[0033] The spring float valve includes a lower valve seat, a lower valve, a spring, and a spring seat. The lower valve seat and the spring seat are installed sequentially on the inner wall of the main body from top to bottom. One end of the lower valve can seal through the spring seat, and the other end can seal in contact with the lower valve seat, so that the spring float valve is closed. The contact end between the lower valve and the lower valve seat has an arc-shaped structure, and a first sealing anti-wear sleeve is fixedly embedded on its surface. The first sealing anti-wear sleeve can fit with a second sealing anti-wear sleeve fixed on the lower valve seat to achieve a seal.

[0034] The pressure seat is an axially through structure, and the opening of the pressure seat near the upstream end of the body forms a necking structure, which allows the liquid to enter the cavity and generate a vibration effect, thereby improving the cementing quality; the outer wall of the pressure transmission sleeve is provided with several semi-circular pressure transmission holes axially.

[0035] The lower valve seat has a circumferential structure of intermittently arranged protrusions and grooves on the end face near the flip-top float valve; it also includes a guide shoe head, which has several through drainage holes, and the guide shoe head is fixedly connected to the lower end of the main body.

[0036] The pressure-transmitting sleeve is coaxially assembled with the inner surface of the main body using a clearance fit. The lower end face of the pressure-transmitting sleeve and the pressure-impacting seat are in contact with the upper surface of the upper valve seat. An opening retaining ring is fixedly installed on the inner wall of the main body, and the upper end face of the pressure-transmitting sleeve is limited by the opening retaining ring.

[0037] Specifically, in this embodiment, the shoe toe 12 has multiple evenly distributed drainage holes, which are threadedly connected to the body 1 and fixed with set screws 11; the spring seat 10, the lower valve seat 7, and the body 1 are all threadedly connected and fixed, and the lower valve seat 7 and the body 1 are sealed by a sealing ring 7-1; the spring 9 is sleeved on the lower valve, with one end in contact with the spring seat 10 and the other end limited by the lower valve and in a compressed state; the spherical first sealing anti-wear sleeve 8-1 embedded on the spherical surface of the lower valve 8 is tightly fitted with the second sealing anti-wear sleeve 7-2 embedded on the conical surface of the lower valve seat 7 under the action of the spring force to achieve a seal, so that the spring float valve is in a state of... Normally closed; the lower valve 8 can move axially downward under water impact, opening the spring float valve; the end face of the lower valve seat near the flip-top float valve has a circumferential structure of intermittently arranged protrusions and grooves, which serves to prevent the flip-top 6 from falling off and completely blocking the spring float valve; the upper valve seat 5 is fixed to the body 1 by a threaded connection and is sealed to the body 1 by a sealing ring 5-2; the first pin hole 6-3 on the flip-top ear plate 6-4, the second pin hole 5-5 on the upper valve seat ear plate 5-6, and the torsion spring 6-2 are coaxially assembled together by a pin 6-1, and the pin 6-1 and the second pin hole 5-5 on the upper valve seat ear plate are interference fit. The latch 6-1 and the first pin hole 6-3 are in clearance fit, allowing the flip cover 6 to rotate around the latch 6-1 by a certain angle. Under the torque of the torsion spring 6-2, the sealing surface of the flip cover 6 can be tightly fitted with the sealing gasket 5-3 embedded in the upper valve seat 5, thereby closing the flip cover valve. The piston 4 is a boss structure, with its small-diameter portion coaxially fitted with the upper valve seat 5 and sealed by the sealing ring 5-1. Its small-diameter end penetrates the inner hole of the upper valve seat 5, overcoming the torque of the torsion spring 6-2 and forcing the flip cover 6 to rotate counterclockwise by a certain angle, causing it to disengage from the upper valve seat sealing gasket 5-3. The flip cover 6 is completely hidden outside the piston 4, and the flip cover float valve is in normal operation. In the open state, the upper stepped surface of piston 4 is completely in contact with the upper surface of upper valve seat 5. The large end of piston 4 is coaxially fitted with the inner hole of pressure seat 3 and sealed with the inner hole of pressure seat 3 by sealing ring 4-1. The piston 4 can move axially under the action of external force. The pressure seat 3 and pressure transmission sleeve 2 are connected by threads. The pressure transmission sleeve 2 and the inner surface of body 1 are coaxially installed together by clearance fit. The lower end face of pressure seat 3 and pressure transmission sleeve 2 is in contact with the upper surface of upper valve seat 5. The upper end of pressure transmission sleeve 2 is fixed by a perforated retaining ring 2-1 that is threaded to the body. The inner wall of the upper end of body 1 is provided with threads for connection with sleeve.

[0038] During normal circulation or cementing operations, because the flip-top float valve is in the normally open state and the flip-top 6 is hidden outside the piston 4, the liquid flowing through the piston 4 will not erode the sealing mechanism of the flip-top 6 and the upper valve seat 5. The spring float valve is in the open state under hydraulic impact, ensuring unobstructed circulation. After the cementing plug 13 deployed during the cementing displacement stage reaches the pressure seat 3, if... Figure 2As shown, after the pressing is completed, the pressure is transmitted through the pressure transmission hole 2-2 of the pressure transmission sleeve 2 to the space between the piston 4 and the upper valve seat 5. Under the action of hydraulic pressure, the piston 4 moves upward, and the flip cover 6 gradually rotates clockwise under the torque of the torsion spring 6-2 and fits and seals with the sealing gasket 5-3 on the upper valve seat, thereby closing the flip cover valve and realizing the dual reverse pressure bearing of the spring float valve and the flip cover float valve.

[0039] The above embodiments have provided a detailed description of the present invention, but the content described is only a preferred embodiment of the present invention and should not be considered as limiting the scope of the present invention. All equivalent variations and improvements made within the scope of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A dual-action anti-erosion floating shoe, characterized in that: The device includes a main body, which is a tubular structure. Inside the main body, from top to bottom, a pressure transmission sleeve, a flip-top float valve, and a spring float valve are installed sequentially. By opening or closing the flip-top float valve and the spring float valve, the internal flow of the main body is achieved. The flip-top float valve includes an upper valve seat and a flip cover. The upper valve seat is fixedly and sealed to the inner wall of the main body. The flip cover is rotatably connected to the upper valve seat, and the flip cover is connected to the upper valve seat through a torsion spring, so that the flip cover flips under the action of the torsion spring and fits tightly against the upper valve seat, thereby closing the flip-top float valve. It also includes a pressing seat, which is fixedly installed on the inner wall of the pressure transmission sleeve. The pressing seat is an axially through structure. A piston is sealed and installed on the inner wall of the pressing seat. The piston is an axially through boss structure. Its small diameter end can axially seal through the upper valve seat, overcome the torsion force of the torsion spring, force the flip cover to rotate and disengage from the upper valve seat, so that the flip cover float valve opens. The spring-loaded float valve includes a lower valve seat, a lower valve, a spring, and a spring seat. The lower valve seat and the spring seat are sequentially mounted on the inner wall of the main body from top to bottom. One end of the lower valve can seal through the spring seat, and the other end can seal in contact with the lower valve seat, thereby closing the spring-loaded float valve. The contact end between the lower valve and the lower valve seat has an arc-shaped structure, and a first sealing anti-wear sleeve is fixedly embedded on its surface. The first sealing anti-wear sleeve can fit against a second sealing anti-wear sleeve fixed on the lower valve seat to achieve a seal. The pressing seat has an axially through structure, and The opening of the pressure seat near the upstream end of the main body forms a constriction structure, which allows the liquid to enter the cavity and generate a vibration effect; the outer wall of the pressure transmission sleeve is provided with several semi-circular pressure transmission holes axially; the end face of the lower valve seat near the flip-top float valve side is formed with a circumferential structure of alternating bosses and grooves; it also includes a guide shoe head, which is provided with several through drainage holes, and the guide shoe head is fixedly connected to the lower end of the main body; an opening retaining ring is fixedly installed on the inner wall of the main body, and the upper end face of the pressure transmission sleeve is limited by the opening retaining ring.

2. The dual-action anti-erosion floating shoe according to claim 1, characterized in that: The pressure transmission sleeve is coaxially assembled with the inner surface of the main body using a clearance fit, and the lower end face of the pressure-contacting seat and the pressure transmission sleeve is in contact with the upper surface of the upper valve seat.

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