cementing apparatus

Abstract

The cement injection device comprises a cylinder body connected with a top cover at a top end, a through central hole a is formed in the cylinder body along an axial direction, an eccentric column is fixedly connected to an outer side of the cylinder body, the eccentric column is parallel to the cylinder body along an axial direction, an eccentric hole a is formed in the eccentric column along an axial direction, an injection joint is fixedly connected to an outer side wall of the eccentric column close to a bottom end, a plurality of transverse holes are formed in the outer side wall of the cylinder body along a radial direction of the cylinder body, the plurality of transverse holes are located on opposite sides of the eccentric column, a plurality of valve bodies are arranged in the cylinder body corresponding to positions of the plurality of transverse holes, one end of the plurality of valve bodies is arranged in the transverse hole, and the other end penetrates to the outer side of the eccentric column. The center of gravity of the cement head coincides with the cylinder body rotation axis, the casing coupling or the variable buckle short section is connected conveniently, the operation action is reduced, and the operation time is saved.

Description

Technical Field

[0001] This invention belongs to the field of oil and gas equipment technology, and specifically relates to a cement injection device. Background Technology

[0002] Cementing is a crucial part of the entire oil drilling process. The quality of cementing directly affects whether oil and gas wells can be successfully produced after commissioning, the lifespan of oil wells, and the recovery rate of oil and gas reservoirs.

[0003] Existing cement heads are externally equipped with injection manifolds. Single-plug cement head injection manifolds have at least two stopcocks, while double-plug cement head manifolds have at least three. These stopcocks cause the cement head's center of gravity to misalign with the casing's rotation center, making it difficult to align the cement head with the casing coupling or adapter short section during wellhead installation. Often, it needs to be pulled to align before installation, resulting in significant workload. Furthermore, during plug insertion, the stopcocks must be opened first, followed by rotating the stop pin to complete the insertion operation. This consumes valuable wellhead construction time and increases labor intensity. Summary of the Invention

[0004] The purpose of this invention is to provide a cement injection device that can efficiently inject cement required for well cementing and quickly drop plugs.

[0005] The technical solution adopted in this invention is a cement injection device, including a cylinder with a top cover connected to the top, a through central hole a opened along the axial direction of the cylinder, an eccentric column fixed to the outer side of the cylinder, the eccentric column having an eccentric hole a opened along the axial direction of the cylinder, an injection connector fixed to the outer side wall of the eccentric column near the bottom end, a number of transverse holes opened along the radial direction of the cylinder on the outer side wall of the cylinder, the number of transverse holes being located on the opposite side of the eccentric column, a number of valve bodies being arranged in the cylinder corresponding to the positions of the number of transverse holes, one end of the number of valve bodies being arranged in the transverse holes, and the other end penetrating to the outside of the eccentric column.

[0006] The invention is further characterized in that,

[0007] One end of the eccentric column is detachably connected to a plug b at the position corresponding to the eccentric hole a, and the other end is detachably connected to a plug a. A connecting hole is radially opened on the side wall of the cylinder near the position of the plug a, and the connecting hole connects the central hole a and the eccentric hole a.

[0008] The valve body includes a main cylinder, the axis of which is perpendicular to the axis of the central hole a. The main cylinder has a central hole b along the axis of the central hole a. A secondary cylinder is axially fixed to one end of the main cylinder. The secondary cylinder passes through the eccentric hole a and has an eccentric hole b along the axis of the eccentric hole a. A connecting rod b is axially fixed to the end of the secondary cylinder away from the main cylinder. The connecting rod b extends to the outside of the eccentric cylinder. A connecting rod a is axially fixed to the other end of the main cylinder. The connecting rod a passes through a transverse hole and is connected to an actuator.

[0009] The connecting rod b extends through the outer sidewall of the eccentric column and has a rotating hole along the radial direction of the connecting rod b.

[0010] The diameter of the central hole a is smaller than the height of the main cylinder, the diameter of the secondary cylinder is smaller than the diameter of the main cylinder, and the diameter of the eccentric hole a is smaller than the height of the secondary cylinder.

[0011] The valve body has an oblique hole along the axial direction of the vertical center hole b, and the two ends of the oblique hole are connected to the center hole b and the eccentric hole a respectively; a short flow channel hole is radially opened on one side of the outer surface of the main cylinder, and the axial direction of the short flow channel hole is perpendicular to the axial direction of the center hole b.

[0012] The connecting rod a is threadedly connected to a lock nut, which is located inside the transverse hole.

[0013] The beneficial effects of this invention are:

[0014] (1) The present invention integrates the injection pipe controlled by the plug valve into the cement head cylinder, realizing the switching of the flow channel and the plug insertion through a single action.

[0015] (2) The present invention makes the center of gravity of the cement head coincide with the rotation axis of the cylinder, which facilitates the connection of the sleeve coupling or the variable thread short section, and reduces the operation and saves the operation time. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the cement injection device of the present invention;

[0017] Figure 2 This is a schematic diagram of the valve body in the cement injection device of the present invention;

[0018] Figure 3 This is a schematic diagram of the dual valve body in the cement injection device of the present invention.

[0019] In the diagram, 1. Top cover, 2. Plug a, 3. Cylinder, 4. Valve body, 5. Plug b, 6. Locking nut, 7. Actuator, 8. Connecting hole, 9. Center hole a, 10. Eccentric hole a, 11. Inclined hole, 12. Eccentric hole b, 13. Injection connector, 14. Short flow channel hole, 15. Center hole b, 16. Rubber plug, 17. Transverse hole, 18. Eccentric column, 19. Main cylinder, 20. Secondary cylinder, 21. Connecting rod a, 22. Connecting rod b, 23. Rotating hole. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0021] A schematic diagram of the cement injection device of the present invention is shown below. Figure 1 As shown,

[0022] The cylinder 3 includes a top cover 1 connected to the top end by a thread. The cylinder 3 has a through central hole a9 along the axial direction. An eccentric column 18 is fixed to the outer side of the cylinder 3 along the axial direction. An eccentric hole a10 is opened in the eccentric column 18 along the axial direction. An injection connector 13 is vertically fixed to the outer wall of the eccentric column 18 near the bottom end. The injection connector communicates with the eccentric hole a10 in the eccentric column 18. A plug b5 is threaded to the bottom end of the eccentric column 18 corresponding to the position of the eccentric hole a10. A plug a2 is threaded to the top end of the eccentric column 18 corresponding to the position of the eccentric hole a10. A connecting hole 8 is radially opened on the side wall of the cylinder 3 near the position of the plug a2. The connecting hole 8 communicates with the central hole a9 and the eccentric hole a10.

[0023] A transverse hole 17 is formed on the outer wall of the cylinder 3 along the radial direction of the cylinder 3. The transverse hole 17 and the eccentric column 18 are located on opposite sides. A valve body 4 is provided inside the cylinder 3 corresponding to the position of the transverse hole 17. The valve body 4 is placed transversely inside the cylinder 3. One end of the valve body 4 is located inside the transverse hole 17 and connected to an actuator 7. The actuator 7 is located outside the cylinder 3. The end of the valve body 4 connected to the actuator 7 is also connected to a locking nut 6 by a thread. The locking nut 6 is located inside the transverse hole 17, and the other end extends through to the outside of the eccentric column 18. A rubber plug 16 is provided inside the cylinder 3. The rubber plug 16 is located between the valve body 4 and the top cover 1.

[0024] like Figure 2 As shown, the valve body 4 includes a main cylinder 19, the axis of the main cylinder 19 is perpendicular to the axis of the central hole a9, and the main cylinder 19 has a central hole b15 along the axis of the central hole a9. The diameter of the central hole b15 is not less than the diameter of the rubber stopper 16, so that the rubber stopper 16 can pass smoothly through the central hole b15 when it is inserted. In order to ensure that the main cylinder 19 will not separate after the central hole b15 is opened, the diameter of the central hole a9 is less than the height of the main cylinder 19.

[0025] A secondary cylinder 20 is axially fixed to one end of the main cylinder 19. The secondary cylinder 20 passes through an eccentric hole a10. The height of the secondary cylinder 20 is longer than the diameter of the eccentric hole a10. An eccentric hole b12 is opened on the secondary cylinder 20 along the eccentric hole a10. A connecting rod b22 is axially fixed to the end of the secondary cylinder 20 away from the main cylinder 19. The length of the connecting rod b22 extends to the outside of the eccentric column 18 and a rotating hole 23 is opened radially along the outer sidewall of the eccentric column 18. A connecting rod a21 is axially fixed to the other end of the main cylinder 19. The connecting rod a21 is connected to the actuator 7.

[0026] The valve body 4 has an oblique hole 11 along the axial direction of the vertical center hole b15, and the two ends of the oblique hole 11 are connected to the center hole b15 and the eccentric hole a10 respectively; a short flow channel hole 14 is radially opened on one side of the outer surface of the main cylinder 19, and the axial direction of the short flow channel hole 14 is perpendicular to the axial direction of the center hole b15.

[0027] like Figure 3As shown, the present invention is not limited to providing one valve body 4 inside the cylinder 3. Two or more valve bodies 4 and matching transverse holes 17, actuators 7 and locking nuts 6 can be provided as needed.

[0028] The working states of this invention are divided into fluid circulation state and plug-in state.

[0029] During fluid circulation, the central hole a9 of the cylinder 3 and the central hole b15 of the valve body 4 are not connected. The eccentric hole a10 of the eccentric column 18 and the eccentric hole b12 of the valve body 4 are also closed. At this time, the central hole b15 of the valve body 4 and the eccentric hole a10 of the eccentric column 18 are connected only through the inclined hole 11 on the valve body 4. At this time, the fluid enters the eccentric hole a10 of the eccentric column 18 from the injection connector 13, enters the central hole b15 of the valve body 4 through the inclined hole 11 of the valve body 4, and then enters the central hole a9 of the cylinder 3 through the short flow channel hole 14 of the valve body 4. If the device contains two valve bodies 4, the fluid enters the central hole a9 of the cylinder 3 only through the inclined hole 11 of the lowermost valve body.

[0030] In the plug-in state, the valve body 4 is rotated 90 degrees by the actuator 7 or manually through the rotating hole 23. At this time, the central hole of the cylinder 3 and the central hole b15 of the valve body 4 are connected, the eccentric hole a10 of the eccentric column 18 and the eccentric hole b12 of the valve body 4 are connected, and the oblique hole 11 of the valve body 4 is closed. At this time, the fluid enters the eccentric hole a10 of the eccentric column 18 through the injection connector 13, and then flows to the connecting hole 8 through the eccentric hole b12 of the valve body 4, and then enters the central hole a9 in the cylinder 3. Since the rubber plug 16 is located below the connecting hole 8, when the fluid enters the central hole a9 through the connecting hole 8, the rubber plug 16 moves downward under the push of the fluid and passes through the central hole b15 of the valve body 4 to complete the plug-in.

[0031] If there are two valve bodies 4, first rotate the lower valve body 4 by 90 degrees so that the fluid enters the eccentric hole a10 of the eccentric column 18 and then enters the central hole a9 of the cylinder 3 through the eccentric hole b12 of the lower valve body 4 and the inclined hole 11 of the upper valve body 4. Driven by the fluid, the rubber plug 16 above the lower valve body 4 is first inserted. Then rotate the upper valve body 4 by 90 degrees so that the inclined hole 11 of the upper valve body 4 is closed. The fluid flows through the eccentric hole b12 of the upper valve body 4 and enters the central hole a9 through the connecting hole 8, thus completing the insertion of the rubber plug 16 at the top of the upper valve body 4.

[0032] This invention integrates the injection pipes controlled by the plug valve into the cement head cylinder, enabling the switching of flow channels and plug insertion to be switched with a single action. This allows the center of gravity of the cement head to coincide with the rotation axis of the cylinder, facilitating the connection of the sleeve coupling or variable thread short section, and reducing the number of operation actions, thus saving operation time.

Claims

1. A cement injection device, characterized in that, The cylinder (3) includes a top cover (1) connected to the top end. The cylinder (3) has a through central hole a (9) along the axial direction. An eccentric column (18) is fixed to the outer side of the cylinder (3). The eccentric column (18) is parallel to the axial direction of the cylinder (3). An eccentric hole a (10) is opened along the axial direction of the eccentric column (18). An injection connector (13) is fixed to the outer side wall of the eccentric column (18) near the bottom end. Several transverse holes (17) are opened in the radial direction of the outer side wall of the cylinder (3). Several transverse holes (17) are located on opposite sides of the eccentric column (18). Several valve bodies (4) are arranged in the cylinder (3) corresponding to the positions of several transverse holes (17). One end of several valve bodies (4) is arranged in the transverse hole (17), and the other end extends to the outside of the eccentric column (18). The valve body (4) includes a main cylinder (19), the main cylinder (19) is axially perpendicular to the central hole a (9), the main cylinder (19) has a central hole b (15) along the central hole a (9), a secondary cylinder (20) is axially fixed to one end of the main cylinder (19), the secondary cylinder (20) passes through the eccentric hole a (10), and the secondary cylinder (20) has an eccentric hole b (12) along the eccentric hole a (10), a connecting rod b (22) is axially fixed to the end of the secondary cylinder (20) away from the main cylinder (19), the connecting rod b (22) extends to the outside of the eccentric column (18); a connecting rod a (21) is axially fixed to the other end of the main cylinder (19), the connecting rod a (21) passes through the transverse hole (17) and is connected to an actuator (7). The valve body (4) has an oblique hole (11) along the axial direction of the vertical center hole b (15), and the two ends of the oblique hole (11) are connected to the center hole b (15) and the eccentric hole a (10) respectively; a short flow channel hole (14) is radially opened on one side of the outer surface of the main cylinder (19), and the axial direction of the short flow channel hole (14) is perpendicular to the axial direction of the center hole b (15). One end of the eccentric column (18) is detachably connected to a plug b (5) at the position corresponding to the eccentric hole a (10), and the other end is detachably connected to a plug a (2). The side wall of the cylinder (3) is radially opened with a connecting hole (8) near the position of the plug a (2). The connecting hole (8) connects the central hole a (9) and the eccentric hole a (10).

2. The cement injection device according to claim 1, characterized in that, The connecting rod b (22) extends through the outer sidewall of the eccentric column (18) and has a rotating hole (23) in the radial direction along the connecting rod b (22).

3. The cement injection device according to claim 1, characterized in that, The diameter of the central hole a (9) is smaller than the height of the main cylinder (19), the diameter of the secondary cylinder (20) is smaller than the diameter of the main cylinder (19), and the diameter of the eccentric hole a (10) is smaller than the height of the secondary cylinder (20).

4. The cement injection device according to claim 1, characterized in that, The connecting rod a (21) is threadedly connected to a locking nut (6), which is located inside the transverse hole (17).

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