Cement type float collar float shoe for well cementation and valve seat assembling method of float collar float shoe

Abstract

The invention discloses a cement type float collar float shoe for well cementation and a valve seat assembling method of the float collar float shoe, and belongs to the field of float shoes and float collars, the float collar float shoe comprises a float shoe body and a float collar body in threaded connection with the top end of the float shoe body, the end, away from the float collar body, of the float shoe body is connected with a guide shoe, and the interior of the float shoe body is in threaded connection with the outer wall of a first valve seat. The end, facing the guiding shoe, of the communicating channel of the first valve seat is in sealed connection with an arch-shaped tongue plate through a torsional spring. According to the cement type float collar float shoe for well cementation and the valve seat assembling method of the float collar float shoe, the tongue plate torsion spring sealing structure is adopted for sealing, and the advantages of being high in durability, low in cost, simple in structure, convenient and fast to install and the like are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of floating shoes and floating collars, and in particular to a floating shoe of a cement type floating collar for cementing and a valve seat assembly method of the floating shoe of the floating collar. Background Art

[0002] A float collar and a float shoe are a type of casing guide shoe or coupling that can generate buoyancy during drilling. The float collar is connected 20-30m from the end of the casing string, acting as a support ring and a back pressure valve, while the float shoe is connected to the end of the casing string, acting as a guide shoe and a back pressure valve.

[0003] The existing floating hoop and floating shoe structure is as follows:

[0004] CN202221829293.0 discloses a high-pressure floating hoop and floating shoe device, which includes a floating hoop body and a floating shoe body. The upper edges of the floating hoop and floating shoe shells are provided with connecting threads, wherein a guide head is threadedly connected to the upper end of the floating shoe body, and the floating hoop and floating shoe shells are provided with threads along both inner and outer sides. A first valve seat body, a valve core guide seat, a valve core arranged between the valve core guide seat and the first valve seat body, and a compression spring mounted on the valve core guide seat for adjusting the valve core to adapt and press against the first valve seat body are arranged in the floating hoop body; a stop spring used in conjunction with the valve core is arranged on the first valve seat body.

[0005] It can be seen that the existing floating collar and floating shoe use the pressure of the spring to make the rubber seal or sealing ring fit tightly against the well wall, thereby preventing cement slurry leakage and protecting the casing and well wall. Therefore, there are the following defects:

[0006] 1. The pressure of the spring may weaken with time and environmental changes, resulting in a decrease in sealing effect;

[0007] 2. Rubber seals and springs need to be regularly inspected and replaced, increasing maintenance costs and workload;

[0008] 3. The installation of springs and rubber seals requires high precision, otherwise poor sealing may result. Summary of the invention

[0009] The purpose of the present invention is to provide a cement type floating collar and floating shoe for cementing and a valve seat assembly method of the floating collar and floating shoe to solve the above technical problems.

[0010] To achieve the above-mentioned purpose, the present invention provides a cement-type floating collar and floating shoe for cementing, comprising a floating shoe body and a floating collar body threadedly connected to the top of the floating shoe body, the end of the floating shoe body away from the floating collar body is connected to a guide shoe, the interior of the floating shoe body is threadedly connected to the outer wall of a first valve seat, and the end of the communicating channel of the first valve seat facing the guide shoe is sealed with a bow-shaped tongue plate via a torsion spring.

[0011] Preferably, one side of the arched tongue plate is in contact with the first valve seat, and the other side is provided with a pressure groove, which is vertically and concentrically connected to the arched tongue plate;

[0012] One end of the torsion spring is fixed on the first valve seat, and the other end is pressed into contact with the center of the pressing groove.

[0013] Preferably, a surface of the arched tongue plate in contact with the first valve seat is configured as a guide slope surface.

[0014] Preferably, a primary sealing ring is provided on the first valve seat and at a position facing the guide ramp surface.

[0015] Preferably, a secondary sealing ring is provided between the outer wall of the first valve seat and the inner wall of the float shoe body.

[0016] Preferably, a plurality of guide holes are provided on the guide shoe, and the plurality of guide holes are evenly and symmetrically arranged about the center of the guide shoe.

[0017] Preferably, a second valve seat is fixed inside the float collar body, and one end of the communication channel of the second valve seat facing the float shoe body is sealed and connected to the sealing head, the sealing head is connected to the valve seat through the valve and a spring arranged on the valve, and the valve seat is fixedly connected to the inside of the float collar body;

[0018] The outer side of the sealing head is wrapped with sealing rubber.

[0019] Preferably, the materials of the float shoe body, the float hoop body and the guide shoe are all aluminum.

[0020] The assembly method of the floating shoe and floating hoop valve seat comprises the following steps:

[0021] S1. Place the float collar and float shoe on the turntable of the valve seat assembly equipment, and then fix them with buckles;

[0022] The valve seat assembly equipment includes a workbench, a reduction motor fixed on the workbench, a turntable connected to the top output end of the reduction motor, and a positioning column fixed on the top of the workbench, wherein the positioning column is located on one side of the turntable;

[0023] A float shoe and a float hoop are fixed to the top of the turntable by a buckle, and the first valve seat or the second valve seat inside the float shoe and the float hoop is clamped with the jaws of a special wrench, the handle of the special wrench is fixed to one end of the connecting rod, and the other end of the connecting rod is vertically slidably arranged on the positioning column;

[0024] S2. Install the first valve seat: put the first valve seat into the floating shoe body position of the floating shoe and floating hoop, extend the jaws of the special wrench into the inside of the communicating channel of the first valve seat, turn the nut of the special wrench to increase the diameter of the jaws until the jaws and the inner wall of the communicating channel of the first valve seat have an interference fit, turn on the reduction motor, the reduction motor drives the turntable to rotate, and then drives the floating shoe and floating hoop to rotate. At this time, under the action of the special wrench, the rotation of the first valve seat is restricted, so that the first valve seat and the floating shoe body generate relative rotation, so that the first valve seat is screwed into the inside of the floating shoe body;

[0025] S3. Turn off the reduction motor, rotate the nut of the special wrench in the opposite direction to reduce the diameter of the jaws, and remove the special wrench from the first valve seat;

[0026] S4, then install the second valve seat: put the second valve seat into the floating hoop body of the floating shoe and floating hoop, turn the nut of the special wrench to increase the diameter of the jaws until the jaws and the inner wall of the communicating channel of the second valve seat are interference fit, turn on the reduction motor, the reduction motor drives the turntable to rotate, and then drives the floating shoe and floating hoop to rotate. At this time, under the action of the special wrench, the rotation of the second valve seat is restricted, so that the second valve seat and the floating hoop body generate relative rotation, so that the second valve seat is screwed into the floating hoop body;

[0027] S5. Turn off the reduction motor, rotate the nut of the special wrench in the opposite direction to reduce the diameter of the jaws, and remove the special wrench from the second valve seat;

[0028] S6. Open the buckle and remove the float shoe and float hoop.

[0029] Therefore, the present invention adopts the above-mentioned cement type floating collar and floating shoe for cementing and the valve seat assembly method of the floating collar and floating shoe, which has the following beneficial effects:

[0030] 1. Efficient sealing: Multi-stage sealing: The multi-stage sealing structure is adopted, including the primary sealing ring, the secondary sealing ring and the sealing rubber, which ensures the sealing effect under different conditions and effectively prevents the leakage of cement slurry;

[0031] Slope surface design: The side of the arched tongue plate that contacts the first valve seat is set as a slope surface, which increases the sealing contact area and improves the sealing performance;

[0032] 2. Reliable anti-leakage function: Torsion spring seal: The combination of the arched tongue plate and the torsion spring enables the sealing structure to automatically adjust under different pressures, ensuring the sealing effect under high and low pressure conditions;

[0033] Sealing head design: The sealing head is connected to the valve seat through a valve and a spring, forming a dynamic sealing system that can effectively cope with pressure changes in the well and prevent leakage;

[0034] 3. Excellent material selection: The float shoe body, float hoop body and guide shoe are all made of aluminum, which has the advantages of light weight, corrosion resistance and wear resistance, extending the service life of the equipment and reducing maintenance costs;

[0035] 4. Optimized fluid dynamics: The guide shoe is equipped with multiple uniform and symmetrical diversion holes, which are conducive to the uniform flow of mud, reduce resistance, improve mud circulation efficiency, and help clean the well wall and keep the well wall clean;

[0036] 5. Easy to install and maintain: modular design, easy to replace and maintain individually, reducing maintenance costs and time;

[0037] 6. Strong adaptability: The multi-stage sealing and dynamic sealing system enable the structure to adapt to different well wall shapes and geological conditions, ensuring good working performance. The multi-stage sealing and dynamic sealing system provides multiple protections and reduces the risk of safety accidents caused by sealing failure;

[0038] In summary, the float shoe and float collar of the present invention have excellent performance in terms of sealing performance, leak-proof function, material selection, fluid dynamics, installation and maintenance, adaptability and safety.

[0039] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is an axial cross-sectional view of a cement-type floating collar and floating shoe for cementing of the present invention;

[0041] Figure 2 It is a structural schematic diagram of the valve seat assembly equipment of the present invention.

[0042] Reference numerals

[0043] 1. Guide shoe; 2. Float shoe body; 3. Pressure groove; 4. First valve seat; 5. Valve seat; 6. Float hoop body; 7. Second valve seat; 8. Sealing head; 9. Sealing rubber; 10. Spring; 11. Valve; 12. Bow tongue plate; 13. Torsion spring; 14. Guide hole; 15. Positioning column; 16. Connecting rod; 17. Reducer motor; 18. Workbench; 19. Special wrench; 20. Turntable. DETAILED DESCRIPTION

[0044] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the invented product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, it should also be noted that, unless otherwise clearly specified and limited, the terms "setting", "installation", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0046] like Figure 1 As shown, a cement-type floating collar and floating shoe for cementing comprises a floating shoe body 2 and a floating collar body 6 threadedly connected to the top of the floating shoe body 2, the end of the floating shoe body 2 away from the floating collar body 6 is connected to the guide shoe 1, the inside of the floating shoe body 2 is threadedly connected to the outer wall of the first valve seat 4, and the end of the communicating channel of the first valve seat 4 facing the guide shoe 1 is sealed with a bow-shaped tongue plate 12 via a torsion spring 13.

[0047] One side of the bow-shaped tongue plate 12 is in contact with the first valve seat 4, and the other side is provided with a pressure groove 3, which is perpendicular and concentric with the bow-shaped tongue plate 12; one end of the torsion spring 13 is fixed on the first valve seat 4, and the other end is crimped with the center of the pressure groove 3. By providing the pressure groove 3, the force-bearing area is increased, thereby improving the sealing effect.

[0048] The side of the bow-shaped tongue plate 12 that contacts the first valve seat 4 is configured as a guiding slope surface, that is, the end of the bow-shaped tongue plate 12 that extends into the communication channel of the first valve seat 4 is configured as a frustum structure, which facilitates guiding the bow-shaped device to enter and exit the communication channel of the first valve seat 4.

[0049] A primary sealing ring is arranged on the first valve seat 4 and facing the guide slope surface, and a secondary sealing ring is arranged between the outer wall of the first valve seat 4 and the inner wall of the float shoe body 2, and the double-stage sealing improves the sealing effect.

[0050] The guide shoe 1 is provided with a plurality of guide holes 14 , which are evenly and symmetrically arranged about the center of the guide shoe 1 .

[0051] A second valve seat 7 is fixed inside the float collar body 6. One end of the communicating channel of the second valve seat 7 facing the float shoe body 2 is sealed with a sealing head 8. The sealing head 8 is connected with the valve seat 5 through a valve 11 and a spring 10 arranged on the valve 11. The valve seat 5 is fixedly connected to the inside of the float collar body 6. The outer side of the sealing head 8 is wrapped with a sealing rubber 9.

[0052] The materials of the float shoe body 2, the float hoop body 6 and the guide shoe 1 are all aluminum.

[0053] The assembly method of the valve seat of the floating shoe and floating collar comprises the following steps:

[0054] S1. Place the floating collar and floating shoe on the turntable 20 of the valve seat assembly equipment, and then fix them with buckles;

[0055] like Figure 2 As shown, the valve seat assembly equipment includes a workbench 18, a reduction motor 17 fixed on the workbench 18, a turntable 20 connected to the top output end of the reduction motor 17, and a positioning column 15 fixed to the top of the workbench 18, and the positioning column 15 is located on one side of the turntable 20; a float shoe and a float hoop are fixed to the top of the turntable 20 by a buckle, and the first valve seat 4 or the second valve seat 7 inside the float shoe and the float hoop is clamped with the jaws of a special wrench 19, and the handle of the special wrench 19 is fixed to one end of a connecting rod 16, and the other end of the connecting rod 16 is vertically slidably set on the positioning column 15.

[0056] S2. Install the first valve seat 4: put the first valve seat 4 into the position of the float shoe body 2 of the float shoe float hoop, extend the jaws of the special wrench 19 into the inside of the communication channel of the first valve seat 4, turn the nut of the special wrench 19 to increase the diameter of the jaws until the jaws and the inner wall of the communication channel of the first valve seat 4 have an interference fit, turn on the reduction motor 17, the reduction motor 17 drives the turntable 20 to rotate, and then drives the float shoe float hoop to rotate. At this time, under the action of the special wrench 19, the rotation of the first valve seat 4 is restricted, so that the first valve seat 4 and the float shoe body 2 generate relative rotation, so that the first valve seat 4 is screwed into the inside of the float shoe body 2;

[0057] S3, turn off the reduction motor 17, rotate the nut of the special wrench 19 in the opposite direction to reduce the diameter of the jaws, and remove the special wrench 19 from the first valve seat 4;

[0058] S4, then install the second valve seat 7: put the second valve seat 7 into the floating hoop body 6 of the floating shoe and floating hoop, turn the nut of the special wrench 19 to increase the diameter of the jaws until the jaws and the inner wall of the communication channel of the second valve seat 7 are interference fit, turn on the reduction motor 17, the reduction motor 17 drives the turntable 20 to rotate, and then drives the floating shoe and floating hoop to rotate. At this time, under the action of the special wrench 19, the rotation of the second valve seat 7 is restricted, so that the second valve seat 7 and the floating hoop body 6 generate relative rotation, so that the second valve seat 7 is screwed into the floating hoop body 6;

[0059] S5, turn off the reduction motor 17, rotate the nut of the special wrench 19 in the opposite direction to reduce the diameter of the jaws, and remove the special wrench 19 from the second valve seat 7;

[0060] S6. Open the buckle and remove the float shoe and float hoop.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A cement type floating collar and floating shoe for cementing, comprising a floating shoe body and a floating collar body threadedly connected to the top of the floating shoe body, characterized in that: One end of the float shoe body away from the float hoop body is connected to the guide shoe, the inside of the float shoe body is threadedly connected to the outer wall of the first valve seat, and the end of the communication channel of the first valve seat facing the guide shoe is sealed with a bow-shaped tongue plate via a torsion spring.

2. A cement type floating collar and floating shoe for cementing according to claim 1, characterized in that: One side of the arched tongue plate is in contact with the first valve seat, and the other side is provided with a pressure groove, which is vertically and concentrically connected to the arched tongue plate; One end of the torsion spring is fixed on the first valve seat, and the other end is pressed into contact with the center of the pressing groove.

3. A cement type floating collar and floating shoe for cementing according to claim 2, characterized in that: A surface of the arched tongue plate that contacts the first valve seat is configured as a guide slope surface.

4. A cement type floating collar and floating shoe for cementing according to claim 3, characterized in that: A primary sealing ring is arranged on the first valve seat and at a position facing the guide slope surface.

5. A cement type floating collar and floating shoe for cementing according to claim 4, characterized in that: A secondary sealing ring is arranged between the outer wall of the first valve seat and the inner wall of the float shoe body.

6. The cement type floating collar and floating shoe for cementing according to claim 5, characterized in that: A plurality of guide holes are provided on the guide shoe, and the plurality of guide holes are evenly and symmetrically arranged about the center of the guide shoe.

7. The cement type floating collar and floating shoe for cementing according to claim 6, characterized in that: A second valve seat is fixed inside the float collar body, and one end of the communication channel of the second valve seat facing the float shoe body is sealed and connected to the sealing head. The sealing head is connected to the valve seat through the valve and a spring arranged on the valve, and the valve seat is fixedly connected to the inside of the float collar body; The outer side of the sealing head is wrapped with sealing rubber.

8. The cement type floating collar and floating shoe for cementing according to claim 7, characterized in that: The materials of the float shoe body, float hoop body and guide shoe are all aluminum.

9. A method for assembling a valve seat of a cement type floating collar and floating shoe for cementing as claimed in claim 8, characterized in that: The following steps are involved: S1. Place the float collar and float shoe on the turntable of the valve seat assembly equipment, and then fix them with buckles; The valve seat assembly equipment includes a workbench, a reduction motor fixed on the workbench, a turntable connected to the top output end of the reduction motor, and a positioning column fixed on the top of the workbench, wherein the positioning column is located on one side of the turntable; A float shoe and a float hoop are fixed to the top of the turntable by a buckle, and the first valve seat or the second valve seat inside the float shoe and the float hoop is clamped with the jaws of a special wrench, the handle of the special wrench is fixed to one end of the connecting rod, and the other end of the connecting rod is vertically slidably arranged on the positioning column; S2. Install the first valve seat: put the first valve seat into the floating shoe body position of the floating shoe and floating hoop, extend the jaws of the special wrench into the inside of the communicating channel of the first valve seat, turn the nut of the special wrench to increase the diameter of the jaws until the jaws and the inner wall of the communicating channel of the first valve seat have an interference fit, turn on the reduction motor, the reduction motor drives the turntable to rotate, and then drives the floating shoe and floating hoop to rotate. At this time, under the action of the special wrench, the rotation of the first valve seat is restricted, so that the first valve seat and the floating shoe body generate relative rotation, so that the first valve seat is screwed into the inside of the floating shoe body; S3. Turn off the reduction motor, rotate the nut of the special wrench in the reverse direction to reduce the diameter of the jaws, and remove the special wrench from the first valve seat; S4, then install the second valve seat: put the second valve seat into the floating hoop body of the floating shoe and floating hoop, turn the nut of the special wrench to increase the diameter of the jaws until the jaws and the inner wall of the communicating channel of the second valve seat are interference fit, turn on the reduction motor, the reduction motor drives the turntable to rotate, and then drives the floating shoe and floating hoop to rotate. At this time, under the action of the special wrench, the rotation of the second valve seat is restricted, so that the second valve seat and the floating hoop body generate relative rotation, so that the second valve seat is screwed into the floating hoop body; S5. Turn off the reduction motor, rotate the nut of the special wrench in the opposite direction to reduce the diameter of the jaws, and remove the special wrench from the second valve seat; S6. Open the buckle and remove the float shoe and float hoop.

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