A high-strength drilling construction float hoop float shoe

Abstract

This invention relates to the field of cementing equipment, and more particularly to a high-strength drilling rig float shoe, comprising an outer sleeve and an inner sleeve fitted inside it; at least three sets of limiting strips are fixedly connected inside the outer sleeve; at least three release grooves and at least three sets of limiting grooves are formed on the outer circumference of the inner sleeve; each release groove communicates with a corresponding set of limiting grooves; each set of limiting grooves is adapted to a set of limiting strips. This invention features a detachable rotating engagement connection between the outer sleeve and the inner sleeve. After grouting, the valve body structure, with the inner sleeve as the main body, can be disassembled and reused, saving costs. Simultaneously, the bottom of the outer sleeve has a closed structure consisting of a fixed sealing plate and a rotating sealing plate, preventing mud backflow after the inner sleeve is removed, ensuring the normal operation of grouting and cementing.

Description

Technical Field

[0001] This invention relates to the field of cementing equipment, and more particularly to a high-strength floating hoop and float shoe for drilling operations. Background Technology

[0002] Floaters are commonly used cementing tools, mainly composed of a shell, valve seat, valve core assembly, and buoyancy structure. Their main function is to prevent backflow of mud during downhole grouting due to pressure differences between the inside and outside of the grouting pipeline. Existing floaters cannot be removed after grouting is completed in the well, eventually solidifying with the cement slurry and casing to form the wellbore structure. The floater is designed as a precision valve to prevent mud backflow, which incurs a certain cost. It cannot be removed from the well after grouting is completed. As a disposable tool, floaters result in wasted equipment resources and high construction costs. Summary of the Invention

[0003] In order to overcome the problems of existing floating hoop and floating shoe, which are mostly disposable and difficult to recycle after grouting, resulting in equipment waste and high cost, this invention provides a high-strength floating hoop and floating shoe for drilling operations.

[0004] The technical solution is as follows: A high-strength drilling rig float shoe includes an outer sleeve and an inner sleeve fitted inside it; it also includes a one-way valve assembly, a connecting assembly, a fixing sealing plate, a rotating sealing plate, and support strips; at least three sets of limiting strips are fixedly connected inside the outer sleeve; at least three release grooves and at least three sets of limiting grooves are opened on the outer circumference of the inner sleeve; each release groove communicates with a corresponding set of limiting grooves; each set of limiting grooves is adapted to a set of limiting strips; a one-way valve assembly to prevent mud backflow is connected inside the inner sleeve; the inner sleeve is connected to a control... The outer sleeve is connected to a connecting component that separates it from the outer sleeve. A fixed sealing plate is fixedly connected to the bottom of the outer sleeve. A rotating sealing plate is rotatably connected to the upper side of the fixed sealing plate. A flow port one is opened on the fixed sealing plate. A flow port two that matches the flow port one is opened on the rotating sealing plate. A connecting post is fixedly connected to the rotating sealing plate. The connecting post is inserted into the bottom of the inner sleeve. At least three support strips for improving the internal strength are rotatably connected inside the outer sleeve. The top of each support strip protrudes towards the center of the outer sleeve. The support strips are arranged in a ring and their heights are staggered. The support strips are embedded in the inner wall of the outer sleeve.

[0005] Furthermore, the one-way valve assembly includes: a flow seat, a mounting seat, a slide rod, a ball valve, and a resilient element; the flow seat is fixedly connected inside the inner sleeve; the flow seat is a hollow cylinder with a mud channel in the middle; the mounting seat is installed inside the inner sleeve; the mounting seat is located below the flow seat; a slide rod is slidably connected to the mounting seat; a ball valve for blocking the flow seat channel is fixedly connected to the top of the slide rod; a resilient element connects the ball valve and the mounting seat; the resilient element is sleeved with the slide rod.

[0006] Furthermore, the connecting assembly includes: a connecting frame and a connecting rod; the connecting frame is fixedly connected to the top of the inner sleeve; a threaded post is fixedly connected to the connecting frame; and the threaded post is threadedly connected to the connecting rod for disassembling the inner sleeve.

[0007] Furthermore, the top of the connecting column is truncated cone-shaped, which facilitates insertion with the inner sleeve.

[0008] Furthermore, it also includes a torsion spring; a torsion spring for applying a fixing force is connected between the fixed sealing plate and the rotating sealing plate.

[0009] Furthermore, it also includes a cover plate; the cover plate is fixed to the top of the inner sleeve to prevent mud from seeping between the outer sleeve and the inner sleeve.

[0010] Furthermore, it also includes a sealing cover; the top of the rotating sealing plate is fixed with a protective torsion spring.

[0011] Furthermore, the edge of the limiting strip facing the limiting groove is machined with a guide bevel to facilitate the limiting strip being inserted into the limiting groove.

[0012] Furthermore, a sealing gasket for enhanced airtightness is fixed to the bottom of the mud channel of the flow seat.

[0013] Furthermore, the bottom of the outer sleeve is provided with connecting threads for installing the guide shoe.

[0014] The present invention has the following advantages: The present invention uses a detachable rotating snap-fit ​​connection between the outer sleeve and the inner sleeve. After the grouting is completed, the valve body structure with the inner sleeve as the main body can be disassembled and reused, saving costs. At the same time, the bottom of the outer sleeve is provided with a closed structure consisting of a fixed sealing plate and a rotating sealing plate. After the inner sleeve is removed, it can prevent mud backflow and ensure the normal progress of grouting and cementing operations.

[0015] After the inner sleeve is removed, the support bars flip downwards on their own, and each support bar is placed horizontally inside the outer sleeve to provide internal support for the outer sleeve, improve the strength of the outer sleeve, and prevent the outer sleeve from deforming due to pressure, which would affect the cementing quality.

[0016] When the inner sleeve is removed, and the first and second flow ports are misaligned and not connected, the bottom of the outer sleeve is sealed to prevent mud backflow. The torsion spring applies a reset torque to the rotating sealing plate, limiting the relative position of the fixed sealing plate and the rotating sealing plate, and preventing the rotating sealing plate from rotating due to construction vibration, so that the first and second flow ports are connected. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the high-strength drilling construction float shoe of the present invention;

[0018] Figure 2 This is a cross-sectional view of the outer sleeve of the present invention;

[0019] Figure 3 This is a schematic diagram of the internal structure of the high-strength drilling hoop and float shoe of the present invention;

[0020] Figure 4 This is an exploded view of the outer sleeve and inner sleeve of the present invention;

[0021] Figure 5 This is a three-dimensional structural diagram of the fixed sealing plate and the rotating sealing plate of the present invention, with the rotating sealing plate shown in cross-section.

[0022] Figure 6 This is a top view of the support bar of the present invention in its folded-down state.

[0023] In the attached diagrams: 1-outer sleeve, 101-limiting strip, 2-inner sleeve, 201-flow seat, 202-mounting seat, 203-slide rod, 204-ball valve, 205-elastic element, 206-release groove, 207-limiting groove, 208-cover plate, 3-connecting bracket, 301-threaded post, 4-connecting rod, 5-fixed sealing plate, 501-flow port one, 502-torsion spring, 6-rotating sealing plate, 601-flow port two, 602-connecting post, 603-sealing cover, 7-support strip. Detailed Implementation

[0024] The present invention will be further described below with reference to specific embodiments. The illustrative embodiments and descriptions herein are used to explain the present invention, but are not intended to limit the present invention.

[0025] Example 1: A high-strength floating hoop and float shoe for drilling operations, such as Figures 1-6 As shown, it includes an outer sleeve 1 and an inner sleeve 2; the inner sleeve 2 is slidably connected inside the outer sleeve 1.

[0026] It also includes a one-way valve assembly, a connecting assembly, a fixed sealing plate 5, a rotating sealing plate 6, and a support strip 7; three sets of limiting strips 101 are fixedly connected inside the outer sleeve 1; three release grooves 206 and three sets of limiting grooves 207 are opened on the outer circumference of the inner sleeve 2; each release groove 206 communicates with a corresponding set of limiting grooves 207; each set of limiting grooves 207 is adapted to a set of limiting strips 101, and when the limiting grooves 207 and the limiting strips 101 are engaged, the inner sleeve 2 is fixed inside the outer sleeve 1; a one-way valve assembly is connected inside the inner sleeve 2, which is used to prevent mud backflow; a connecting assembly is connected to the top of the inner sleeve 2, and by rotating the inner sleeve 2 through the connecting assembly, the limiting strips 101 are aligned with the limiting grooves 207, thereby allowing the inner sleeve 2 to detach from the outer sleeve 1. A fixed sealing plate 5 is fixedly connected to the bottom of the outer sleeve 1; a rotating sealing plate 6 is rotatably connected to the upper side of the fixed sealing plate 5; four flow ports 501 are opened on the fixed sealing plate 5; four flow ports 601 are opened on the rotating sealing plate 6, the flow ports 601 are aligned with the flow ports 501 to allow mud to flow, and the flow ports 601 are misaligned with the flow ports 501 to prevent mud from flowing; three connecting posts 602 are welded to the rotating sealing plate 6; the connecting posts 602 are inserted into the bottom of the inner sleeve 2; three support bars 7 are rotatably connected inside the outer sleeve 1; the top of each support bar 7 is designed to protrude towards the center of the outer sleeve 1 for counterweight, and the support bar 7 will automatically fold down when it is no longer restricted by the inner sleeve 2; the support bars 7 are arranged in a ring and their heights are staggered; the support bars 7 are embedded in the inner wall of the outer sleeve 1.

[0027] The one-way valve assembly includes: a flow seat 201, a mounting seat 202, a slide rod 203, a ball valve 204, and an elastic element 205; the flow seat 201 is fixedly connected to the upper side of the inner sleeve 2; the flow seat 201 is a hollow cylinder with a mud channel in the middle; the mounting seat 202 is installed on the lower side of the inner sleeve 2; the slide rod 203 is slidably connected to the mounting seat 202; the ball valve 204 is welded to the top of the slide rod 203, the ball valve 204 is adapted to the channel of the flow seat 201, and the bottom of the channel is sealed; the elastic element 205 is connected between the ball valve 204 and the mounting seat 202; the elastic element 205 is a spring; the elastic element 205 is sleeved with the slide rod 203.

[0028] The connecting assembly includes: a connecting frame 3 and a connecting rod 4; the connecting frame 3 is welded to the top of the inner sleeve 2; a threaded post 301 is welded to the center of the connecting frame 3; the threaded post 301 is threadedly connected to the connecting rod 4. After the outer sleeve 1 is fixed, rotating the connecting rod 4 in the direction of thread tightening can drive the inner sleeve 2 to rotate, thereby releasing the fixation between the inner sleeve 2 and the outer sleeve 1.

[0029] To facilitate insertion with the bottom of the inner sleeve 2, the top of the connecting post 602 is shaped like a frustum.

[0030] It also includes a torsion spring 502; the torsion spring 502 connects the fixed sealing plate 5 and the rotating sealing plate 6. When the flow port 1 501 and the flow port 2 601 are misaligned, the torsion spring 502 is in an extended state, applying a fixing force to the fixed sealing plate 5 and the rotating sealing plate 6 to maintain their relative positions.

[0031] It also includes a cover plate 208; to prevent mud from seeping between the outer sleeve 1 and the inner sleeve 2, a ring-shaped cover plate 208 is fixedly attached to the top of the inner sleeve 2.

[0032] It also includes a sealing cover 603; the top of the rotating sealing plate 6 is fixed with the sealing cover 603 to isolate the mud and protect the torsion spring 502 so that it can work normally.

[0033] To facilitate the docking of the limiting strip 101 with the limiting groove 207, the edge of the limiting strip 101 facing the limiting groove 207 is machined with a guide slope.

[0034] A sealing gasket is fixed to the bottom of the mud channel of the flow seat 201 and the contact surface of the ball valve 204 to enhance the sealing performance when the ball valve 204 is closed.

[0035] The bottom of the outer casing 1 is provided with connecting threads, which can be connected to various types of guide shoes to guide the casing to be smoothly lowered into the well.

[0036] The steps for using this invention are as follows:

[0037] When assembling this invention, align the release groove 206 of the inner sleeve 2 with the limiting strip 101 of the outer sleeve 1. Then, insert the inner sleeve 2 downwards into the outer sleeve 1 until the bottom of the inner sleeve 2 contacts the rotating sealing plate 6. The connecting post 602 will be inserted into the bottom of the inner sleeve 2. At this time, the first flow port 501 and the second flow port 601 are misaligned and not connected. Then, rotate the inner sleeve 2 so that the limiting strip 101 moves from the release groove 206 into the limiting groove 207, locking the inner sleeve 2 and preventing it from detaching upwards from the outer sleeve 1. While rotating the inner sleeve 2, the connected post 602 will drive the rotating sealing plate 6 to rotate, so that the first flow port 501... Align and connect 501 and flow port 2 601. Then screw the connecting rod 4 to the threaded post 301. Then screw the top of the outer sleeve 1 to the outlet of the pumping mud pipe. The connecting rod 4 extends into the pipe, and the top of the connecting rod 4 is lower than the pipe inlet. Then lower the outer sleeve 1 and the pipe into the well. Connect the pump to the pipe inlet for mud injection cementing. The mud is pumped from the pipe into the outer sleeve 1, flows downward through the inside of the flow seat 201, pushes the ball valve 204 downward to open, and compresses the elastic element 205. The mud passes downward through flow port 1 501 and flow port 2 601 and is injected into the well from the bottom of the outer sleeve 1.

[0038] After grouting is completed, the pipeline stops pumping slurry, the ball valve 204 loses slurry pressure, the elastic element 205 extends and pushes the ball valve 204 upward to reset, sealing the flow seat 201. Then, the connection between the pump and the pipeline is disconnected, and the connecting rod 4 is rotated in the direction of tightening with the threaded column 301, which drives the connecting frame 3 and the inner sleeve 2 to rotate, so that the limit strip 101 is re-aligned with the release groove 206. Then, the connecting rod 4 is pulled upward to lift the inner sleeve 2 out of the outer sleeve 1 and move it upward along the inside of the grouting pipeline (it should be noted that the outer diameter of the inner sleeve 2 is smaller than that of the grouting pipeline, so it will not be hindered by the residual slurry in the grouting pipeline) until the inner sleeve 2 is removed. While the inner sleeve 2 is rotating, the connecting column 602 inserted with it drives the rotating sealing plate 6 to rotate, so that the flow port 1 501 and the flow port 2 601 are misaligned and not connected, sealing the bottom of the outer sleeve 1 and preventing slurry backflow.

[0039] As the inner sleeve 2 moves upward away from the outer sleeve 1, the support strip 7, which is vertically embedded in the inner wall of the outer sleeve 1, will lose the obstruction of the inner sleeve 2. The top of the support strip 7 protrudes towards the center of the outer sleeve 1 to provide counterweight, so that the support strip 7 flips downward and becomes horizontal under the action of gravity. The top of the support strip 7 contacts the inner wall of the outer sleeve 1, and each support strip 7 is placed horizontally inside the outer sleeve 1 to provide internal support for the outer sleeve 1.

[0040] It should be noted that when installing the inner sleeve 2 into the outer sleeve 1, the outer sleeve 1 is inverted before installing the inner sleeve 2. When the outer sleeve 1 is inverted, the support bar 7 will be vertically embedded in the inner wall of the outer sleeve 1 due to gravity.

[0041] When the inner sleeve 2 drives the rotating sealing plate 6 to rotate, aligning and connecting the first flow port 501 and the second flow port 601, the rotating sealing plate 6 will compress the torsion spring 502. When the inner sleeve 2 drives the rotating sealing plate 6 to rotate, causing the first flow port 501 and the second flow port 601 to be misaligned and not connected, the torsion spring 502 will return to its original state. After the inner sleeve 2 is removed, it will continue to apply pressure to the fixed sealing plate 5 and the rotating sealing plate 6, limiting the relative position of the fixed sealing plate 5 and the rotating sealing plate 6, and keeping the first flow port 501 and the second flow port 601 misaligned and not connected.

[0042] Based on the above steps, we can see that the present invention has the following effects:

[0043] Existing floats and buoys are all disposable and cannot be removed from the well after grouting, resulting in wasted equipment resources and high construction costs. The outer sleeve 1 and inner sleeve 2 of this invention are detachable and rotatedly connected. After grouting, the valve body structure with the inner sleeve 2 as the main body can be disassembled and reused, saving costs. At the same time, the bottom of the outer sleeve 1 is equipped with a sealing structure with a fixed sealing plate 5 and a rotating sealing plate 6. After the inner sleeve 2 is removed, it can prevent mud backflow and ensure the normal progress of grouting and cementing operations.

[0044] After the inner sleeve 2 is removed, the support bars 7 flip downwards on their own, and each support bar 7 is placed horizontally inside the outer sleeve 1 to provide internal support for the outer sleeve 1, thereby increasing the strength of the outer sleeve 1 and preventing the outer sleeve 1 from deforming due to pressure, which would affect the cementing quality.

[0045] When the inner sleeve 2 is removed, the first flow port 501 and the second flow port 601 are misaligned and not connected. When the bottom of the outer sleeve 1 is sealed to prevent mud backflow, the torsion spring 502 returns to its original state and applies pressure to the fixed sealing plate 5 and the rotating sealing plate 6, limiting the relative position of the fixed sealing plate 5 and the rotating sealing plate 6, keeping the first flow port 501 and the second flow port 601 misaligned and not connected, and avoiding the rotation of the rotating sealing plate 6 caused by construction vibration, so that the first flow port 501 and the second flow port 601 are connected.

[0046] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A high-strength drilling rig float shoe, comprising an outer sleeve (1) and an inner sleeve (2) fitted inside therein; characterized in that, It also includes a one-way valve assembly, a connecting assembly, a fixed sealing plate (5), a rotating sealing plate (6), and a support strip (7); at least three sets of limiting strips (101) are fixedly connected inside the outer sleeve (1); at least three release grooves (206) and at least three sets of limiting grooves (207) are opened on the outer circumference of the inner sleeve (2); each release groove (206) is connected to a corresponding set of limiting grooves (207); each set of limiting grooves (207) is adapted to a set of limiting strips (101); a one-way valve assembly for preventing mud backflow is connected inside the inner sleeve (2); a connecting assembly for controlling its separation from the outer sleeve (1) is connected to the inner sleeve (2); and a support strip is fixedly connected to the bottom of the outer sleeve (1). Fixed sealing plate (5); Rotary sealing plate (6) is rotatably connected to the upper side of fixed sealing plate (5); Flow port one (501) is opened on fixed sealing plate (5); Flow port two (601) is opened on rotary sealing plate (6) to match flow port one (501); Connecting post (602) is fixedly connected to rotary sealing plate (6); Connecting post (602) is inserted into the bottom of inner sleeve (2); At least three support strips (7) are rotatably connected inside outer sleeve (1) to improve its internal strength; The top of each support strip (7) protrudes towards the center of outer sleeve (1); Each support strip (7) is distributed in a ring and the heights are staggered; Support strips (7) are embedded in the inner wall of outer sleeve (1); It also includes a torsion spring (502); a torsion spring (502) is provided between the fixed sealing plate (5) and the rotating sealing plate (6), and the torsion spring (502) is used to automatically reset the rotating sealing plate (6) to the position of closing the flow port one (501); When the inner sleeve (2) drives the rotating sealing plate (6) to rotate, so that the first flow port (501) and the second flow port (601) are aligned and connected, the rotating sealing plate (6) will compress the torsion spring (502). When the inner sleeve (2) drives the rotating sealing plate (6) to rotate, so that the first flow port (501) and the second flow port (601) are misaligned and not connected, the torsion spring (502) will return to its original state. After the inner sleeve (2) is removed, it will continue to apply pressure to the fixed sealing plate (5) and the rotating sealing plate (6), restricting the relative position of the fixed sealing plate (5) and the rotating sealing plate (6), and keeping the first flow port (501) and the second flow port (601) misaligned and not connected.

2. The high-strength drilling buoy and float shoe according to claim 1, characterized in that, The one-way valve assembly includes: a flow seat (201), a mounting seat (202), a slide rod (203), a ball valve (204), and an elastic element (205); the flow seat (201) is fixedly connected inside the inner sleeve (2); the flow seat (201) is a hollow cylinder, and its inner cavity forms a mud channel; the mounting seat (202) is installed inside the inner sleeve (2); the mounting seat (202) is located below the flow seat (201); the slide rod (203) is slidably connected to the mounting seat (202); the top of the slide rod (203) is fixedly connected to a ball valve (204) for blocking the passage of the flow seat (201); an elastic element (205) is provided between the ball valve (204) and the mounting seat (202), and the elastic element (205) always applies an upward elastic force to the slide rod (203); the elastic element (205) is sleeved with the slide rod (203).

3. The high-strength drilling rig float shoe according to claim 2, characterized in that, The connecting assembly includes: a connecting frame (3) and a connecting rod (4); the connecting frame (3) is fixedly attached to the top of the inner sleeve (2); the connecting frame (3) is fixedly attached to a threaded post (301); the threaded post (301) is threadedly connected to the connecting rod (4) for disassembling the inner sleeve (2).

4. The high-strength drilling rig float shoe according to claim 3, characterized in that, The top of the connecting column (602) is truncated, which facilitates insertion with the inner sleeve (2).

5. A high-strength drilling rig float shoe according to claim 1, characterized in that, It also includes a cover plate (208); the cover plate (208) is fixed to the top of the inner sleeve (2) to prevent mud from seeping between the outer sleeve (1) and the inner sleeve (2).

6. The high-strength drilling buoy and float shoe according to claim 1, characterized in that, It also includes a sealing cover (603); the top of the rotating sealing plate (6) is fixed with a protective torsion spring (502) and the sealing cover (603).

7. A high-strength drilling rig float shoe according to claim 6, characterized in that, The limiting strip (101) has a guide bevel on the side edge facing the limiting groove (207) to facilitate the limiting strip (101) to be inserted into the limiting groove (207).

8. A high-strength drilling rig float shoe according to claim 7, characterized in that, The bottom of the mud channel of the flow seat (201) is fixed with a sealing gasket to enhance the airtightness.

9. A high-strength drilling rig float shoe according to claim 6, characterized in that, The bottom of the outer sleeve (1) is provided with a threaded interface for connecting the shoe.

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