Split union type high-pressure cement head

Abstract

The utility model discloses a split union type high-pressure cement head which comprises two groups of tee joints A, a union head top cover, a rubber plug barrel, a union stop pin assembly, a position indicator and a rubber plug, the union head top cover is arranged at the top of the tee joint A above, a connecting barrel is arranged at the bottom of the rubber plug barrel, and the position indicator is arranged on the connecting barrel. The rubber plug is arranged in the rubber plug barrel and extends into the connecting barrel, the union stop pin assembly is arranged on the outer wall of the connecting barrel and extends to the bottom of the rubber plug in the connecting barrel, the rubber plug barrel and the connecting barrel are arranged between the two sets of tee joints A, and the position indicator is arranged at the bottom of the tee joint A located on the lower portion and used for displaying whether the rubber plug moves downwards or not. The tee joint A, the union top cover, the rubber plug cylinder, the connecting cylinder and the position indicator are connected through wing-shaped nuts. According to the split union type high-pressure cement head, the position indicating device is of a mechanical linkage structure, the position indicating rod is automatically triggered to rotate when the rubber plug moves downwards, a visual confirmation signal is provided, and manual misjudgment is avoided.

Description

Technical Field

[0001] This utility model relates to the field of drilling and cementing technology, specifically a split union-type high-pressure cement head. Background Technology

[0002] In oil well cementing operations, the cement head is a key device connecting the casing and cementing line, primarily used to inject cement slurry and release the rubber plug to isolate different fluids. As oil and gas exploration and development moves towards deeper and ultra-deep wells, cementing operations face challenges of higher pressure and more complex conditions. Traditional cement heads have revealed numerous technical bottlenecks over long-term use. The most critical issue is the difficulty in visually monitoring the downward movement of the rubber plug, requiring operators to rely on experience, which can easily lead to misjudgments and fails to meet the safety, reliability, and efficiency requirements of modern cementing operations. Utility Model Content

[0003] The purpose of this utility model is to overcome or at least partially solve the above problems by proposing a split-type high-pressure cement head.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a split-type union-type high-pressure cement head, comprising a T-connector A, a union head top cover, a rubber stopper cylinder, a union stopper pin assembly, a position indicator, and a rubber stopper. The T-connector A consists of two sets. The union head top cover is located on the top of the upper T-connector A. A connecting cylinder is located at the bottom of the rubber stopper cylinder. The rubber stopper is located in the rubber stopper cylinder and extends into the connecting cylinder. The union stopper pin assembly is located on the outer wall of the connecting cylinder and extends to the bottom of the rubber stopper inside the connecting cylinder, serving to support and release the rubber stopper. The rubber stopper cylinder and the connecting cylinder are located between the two sets of T-connectors A. The position indicator is located at the bottom of the lower T-connector A, serving to indicate whether the rubber stopper has moved downwards. The T-connector A, union head top cover, rubber stopper cylinder, connecting cylinder, and position indicator are all connected by wing nuts.

[0005] In a preferred embodiment, the outer end of the lower tee A is connected to a stopcock valve, the other end of which is connected to a four-way valve. The top of the four-way valve is connected to another stopcock valve, and the top of this stopcock valve is connected to a vertical short section. The outer end of the upper tee A is connected to a horizontal short section, the other end of which is connected to a tee B. The bottom end of tee B is connected to the top of the vertical short section. The top of tee B is provided with an extended union lug. The tee A, the stopcock valve, the four-way valve, the vertical short section, the horizontal short section, tee B, and the extended union lug are all connected by wing nuts.

[0006] In a preferred embodiment, a lifting beam is inserted between the extended union head lug and the union head top cover, and hexagonal nuts are screwed onto both sides of the outer wall of the lifting beam, respectively, and are tightly attached to the outer sides of the extended union head lug and the union head top cover.

[0007] In a preferred embodiment, the tee A includes a tee union body, the rubber stopper includes a single stopper, and the indicator includes an indicator body. Union sealing rings are provided in the top and outer openings of the tee union body, the top opening of the single stopper, and the top opening of the indicator body. A retaining sleeve is provided between the bottom end of the tee union body, the single stopper, and the indicator body and the corresponding wing nut. An elastic retaining ring is provided outside the retaining sleeve.

[0008] In a preferred embodiment, the retaining pin assembly includes a retaining pin cylinder disposed on the outer wall of a connecting cylinder at the bottom of the rubber stopper cylinder, with one end of the retaining pin cylinder extending to the inner wall of the connecting cylinder. A retaining pin cap is fitted onto the other end of the retaining pin cylinder. A retaining pin is connected to the retaining pin cylinder via a spline, with one end of the retaining pin extending into the connecting cylinder. A retaining pin shaft is screwed into the retaining pin. One end of the retaining pin shaft extends sequentially out of the retaining pin cylinder and the retaining pin cap, and a handwheel is fitted onto the retaining pin shaft. A retaining pin shaft locking nut is also screwed onto the outside of the retaining pin shaft to press and fix the handwheel and the retaining pin cap. The other end of the retaining pin shaft extends out to the bottom of the rubber stopper, and the end of the retaining pin extending into the connecting cylinder abuts against the head of the retaining pin shaft.

[0009] In a preferred embodiment, one end of the stop pin is further provided with a grease fitting, which extends into the stop pin shaft.

[0010] In a preferred embodiment, the position indicator further includes a position hole plug disposed at an opening on the outside of the position indicator body, a position shaft rotatably disposed in the opening on the outside of the position indicator body, and a position stop pin disposed on the position shaft. The position stop pin extends into the cavity of the position indicator body. One end of the position shaft extends out of the position indicator body and is provided with a position rod. A cotter pin is provided on the position rod. The other end of the position shaft is connected to a position shaft plug via a thrust ball bearing. The position shaft plug extends out of the position indicator body. A nut is screwed onto the outer wall of the position shaft plug and is tightly attached to the outer wall of the position indicator body.

[0011] In a preferred embodiment, O-rings are provided at the end of the stop pin abutting against the stop pin shaft, between the stop pin and the stop pin cylinder, between the position indicator hole plug and the outer opening of the position indicator body, and between the position indicator stop pin and the position indicator body.

[0012] In a preferred embodiment, a protruding plug is provided in the bottom opening of the four-way valve.

[0013] In a preferred embodiment, the bottom end of the indicator is connected to an oil pipe joint or a pressure test joint via a wing nut.

[0014] Compared with the prior art, this utility model provides a split union-type high-pressure cement head. Its position indicator adopts a mechanical linkage structure. When the rubber plug descends, it automatically triggers the rotation of the position indicator rod, providing an intuitive visual confirmation signal and avoiding human misjudgment. In addition, the plug valve is designed at the bottom for easy opening and closing. The top cover is equipped with an extended union lifting lug and lifting beam structure to support balanced force on both lifting points, adapt to different wellhead equipment, and is easy to disassemble and assemble. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the front sectional view of the present invention;

[0016] Figure 2 This is a three-dimensional structural diagram of the present invention;

[0017] Figure 3 This is a side view of the structure of this utility model;

[0018] Figure 4 This is a cross-sectional view of the T-junction A of this utility model;

[0019] Figure 5 This is a three-dimensional structural diagram of the T-junction A of this utility model;

[0020] Figure 6 This is a cross-sectional view of the rubber stopper cylinder of this utility model;

[0021] Figure 7 This is a cross-sectional structural schematic diagram of the non-retaining pin assembly of this utility model;

[0022] Figure 8 This is a three-dimensional structural diagram of the non-retaining pin assembly of this utility model;

[0023] Figure 9 This is a cross-sectional view of the position indicator of this utility model;

[0024] Figure 10 This is a side sectional view of the positioning shaft of this utility model.

[0025] In the diagram: 1. Union head cap; 3. Tee A; 31. Tee Union body; 4. Rubber stopper sleeve; 44. Single stopper sleeve; 5. Union stop pin assembly; 51. Handwheel; 52. Stop pin shaft locking nut; 53. Stop pin shaft; 54. Stop pin cap; 55. Stop pin sleeve; 56. Stop pin; 57. Grease nipple; 6. Plug valve; 7. Position indicator; 74. Position indicator body; 75. Position indicator hole plug; 76. Position indicator stop pin; 77. Position indicator shaft; 79. Position indicator rod; 710. Cotter pin; 711. Thrust ball bearing; 712. Screw 713, indicator shaft plug; 8, pressure test joint; 9, oil pipe joint; 10, protruding plug; 11, four-way connector; 12, vertical short section; 13, tee B; 15, extended union head lifting lug; 16, transverse short section; 17, lifting beam; 18, hexagonal nut; 19, rubber plug; 2, 36, 41, 71 and 14 are all wing nuts; 32, 33, 45 and 78 are all union seals; 34, 43 and 73 are all ferrules; 35, 42 and 72 are all elastic retaining rings; 58 and 714 are both O-rings. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to the accompanying drawings.

[0027] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this description, those skilled in the art can make creative modifications to this embodiment as needed, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

[0028] This utility model relates to a split-type union-type high-pressure cement head, which solves the technical problems in the prior art. The overall concept is as follows:

[0029] Example 1:

[0030] Please see Figures 1-10A split-type union-type high-pressure cement head includes a tee A3, a union head top cover 1, a rubber stopper cylinder 4, a union stopper pin assembly 5, a position indicator 7, and a rubber stopper 19. There are two sets of tee A3. The union head top cover 1 is located on the top of the upper tee A3. A connecting cylinder is located at the bottom of the rubber stopper cylinder 4. The rubber stopper 19 is located in the rubber stopper cylinder 4 and extends into the connecting cylinder. The union stopper pin assembly 5 is located on the outer wall of the connecting cylinder and extends to the bottom of the rubber stopper 19 inside the connecting cylinder, used for supporting and releasing the rubber stopper 19. The rubber stopper cylinder 4 and the connecting cylinder are located between the two sets of tee A3. The position indicator 7 is located at the bottom of the lower tee A3, used to indicate whether the rubber stopper 19 has moved downwards. The tee A3, union head top cover 1, rubber stopper cylinder 4, connecting cylinder, and... The position indicators 7 are all connected by wing nuts. The outer end of the lower tee A3 is connected to a plug valve 6. The other end of the plug valve 6 is connected to a four-way valve 11. The top of the four-way valve 11 is connected to another plug valve 6, and the top of the plug valve 6 is connected to a vertical short section 12. The outer end of the upper tee A3 is connected to a horizontal short section 16. The other end of the horizontal short section 16 is connected to a tee B13, and the bottom end of the tee B13 is connected to the top of the vertical short section 12. The top of the tee B13 is provided with an extended union lug 15. The tee A3, plug valve 6, four-way valve 11, vertical short section 12, horizontal short section 16, tee B13, and extended union lug 15 are all connected by wing nuts.

[0031] Furthermore, a lifting beam 17 is inserted between the extended union head lug 15 and the union head top cover 1, and hexagonal nuts 18 are screwed onto both sides of the outer wall of the lifting beam 17, respectively attached to the outer side of the extended union head lug 15 and the union head top cover 1.

[0032] Furthermore, the tee A3 includes a tee union body 31, the rubber stopper 4 includes a single stopper 44, and the indicator 7 includes an indicator body 74. Union sealing rings are provided in the top and outer openings of the tee union body 31, the top opening of the single stopper 44, and the top opening of the indicator body 74. A retaining sleeve is provided between the bottom of the tee union body 31, the single stopper 44, and the indicator body 74 and the corresponding wing nut. An elastic retaining ring is provided outside the retaining sleeve.

[0033] In specific implementation, the retaining pin assembly 5 includes a retaining pin cylinder 55 located on the outer wall of the connecting cylinder at the bottom of the rubber stopper cylinder 4. One end of the retaining pin cylinder 55 extends to the inner wall of the connecting cylinder, and the other end of the retaining pin cylinder 55 is fitted with a retaining pin cap 54. A retaining pin 56 is connected to the retaining pin cylinder 55 via a spline, and one end of the retaining pin 56 extends into the connecting cylinder. A retaining pin shaft 53 is screwed into the retaining pin 56. One end of the retaining pin shaft 53 extends out of the retaining pin cylinder 55 and the retaining pin cap 54 in sequence, and a handwheel 51 is fitted on the retaining pin shaft 53 and pressed on it. A retaining pin shaft locking nut 52 is also screwed onto the outside of the retaining pin shaft 53 to press and fix the handwheel 51 and the retaining pin cap 54. The other end of the retaining pin shaft 53 extends out of the retaining pin 56 to below the rubber stopper 19. The end of the retaining pin 56 extending into the connecting cylinder abuts against the head of the retaining pin shaft 53. A grease nipple 57 is also provided at one end of the retaining pin 56 and extends into the retaining pin shaft 53.

[0034] In a specific implementation, the position indicator 7 also includes a position hole plug 75 disposed at the opening on the outside of the position body 74, a position shaft 77 rotatably disposed in the opening on the outside of the position body 74, and a position stop pin 76 disposed on the position shaft 77. The position stop pin 76 extends into the cavity of the position body 74. One end of the position shaft 77 extends out of the position body 74 and is provided with a position rod 79. A cotter pin 710 is provided on the position rod 79. The other end of the position shaft 77 is connected to a position shaft plug 713 through a thrust ball bearing 711. The position shaft plug 713 extends out of the position body 74. A nut 712 is screwed onto the outer wall of the position shaft plug 713 and is tightly attached to the outer wall of the position body 74.

[0035] Furthermore, O-rings are provided at the end of the stop pin 56 abutting against the stop pin shaft 53, between the stop pin 56 and the stop pin cylinder 55, between the position indicator hole plug 75 and the outer opening of the position indicator body 74, and between the position indicator stop pin 76 and the position indicator body 74.

[0036] In practice, a protruding plug 10 is provided in the bottom opening of the four-way 11, and the bottom of the indicator body 74 is connected to an oil pipe joint 9 or a pressure test joint 8 through a wing nut.

[0037] Its detailed connection methods are well-known technologies in this field. The following mainly introduces the working principle and process, and the specific work is as follows:

[0038] In use, the rubber plug 19 is installed above the stop pin 56 inside the rubber plug cylinder 4, and the cement head is installed at the upper end of the tubing string. When cementing and replacing the mud, the stop pin 56 is opened to release the rubber plug 19. When the rubber plug 19 passes through the indicator 7, it drives the indicator stop pin 76 to rotate. The indicator stop pin 76 drives the indicator rod 79 to rotate a certain angle through the indicator shaft 77, informing the operator that the rubber plug 19 has descended and passed through the indicator 7.

[0039] When operating the stop pin 56 switch, turn the handwheel 51. The handwheel 51 drives the stop pin shaft 53 to rotate. Since the stop pin shaft 53 is screwed onto the stop pin 56, and the stop pin 56 and the stop pin cylinder 55 are splined, the stop pin 56 cannot rotate. Then the stop pin shaft 53 rotates to push the stop pin 53 to extend or retract, thereby realizing the switch operation.

[0040] The above description of the embodiments is provided to facilitate understanding and use of the present invention by those skilled in the art. It is obvious to those skilled in the art that various modifications can be made to the embodiments, and the general principles described herein can be applied to other embodiments without creative effort. Therefore, the present invention is not limited to the above embodiments. Any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the protection scope of the present invention.

Claims

1. 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rubber plug cylinder (4), by the head cover (1), rubber plug cylinder (4), by the head cover (1), rubber plug cylinder (4), by the head cover (1), rubber plug cylinder (4), by the head cover (1), rubber plug cylinder (4), by the head cover (1), rubber plug cylinder (4), by the head cover (1), rubber plug cylinder (4), by the head cover (1), rubber plug cylinder (4), by the head cover (1), rubber plug cylinder (4), by the head cover (1), rubber plug cylinder (4), by the head cover (1), rubber plug cylinder (4), by the head cover (1), rubber plug cylinder (4), by the head cover (1), rubber plug cylinder (4), by the head cover (1), rubber plug cylinder (4), by the head cover (1), rubber plug cylinder (4), by the head cover (1), rubber plug cylinder (4), by the head cover (1), rubber plug cylinder (4), by the head cover (1), rubber plug cylinder (4), by the head cover (1), rubber plug cylinder (4), by the head cover (1), rubber plug cylinder (4), by the head cover (1), rubber plug cylinder 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A split-body high-pressure cementing head according to claim 1, characterized in that: ​ 3. A split-body high-pressure cementing head according to claim 2, characterized in that: ​ 4. A split-body high-pressure cementing head according to claim 3, characterized in that: ​ 5. A split-body high-pressure cementing head according to claim 4, characterized in that: The stop pin assembly (5) comprises a stop pin barrel (55) arranged on the outer wall of the connecting barrel at the bottom of the rubber plug barrel (4), and one end of the stop pin barrel (55) extends to the inner wall of the connecting barrel, the other end of the stop pin barrel (55) is sleeved with a stop pin cap (54), the stop pin barrel (55) is connected with a stop pin (56) through spline, and one end of the stop pin (56) extends to the connecting barrel, the stop pin (56) is screwed with a stop pin shaft (53), one end of the stop pin shaft (53) extends out of the stop pin barrel (55) and the stop pin cap (54) in turn, and a hand wheel (51) is sleeved on the stop pin shaft (53) and pressed, the stop pin shaft (53) is further screwed with a stop pin shaft locking nut (52), the hand wheel (51) and the stop pin cap (54) are pressed and fixed, the other end of the stop pin shaft (53) extends out of the stop pin (56) to below the rubber plug (19), and the end of the stop pin (56) extending into the connecting barrel abuts against the head of the stop pin shaft (53).

6. A split-body high-pressure cementing head according to claim 5, characterized in that: The stop pin (56) is further provided with a grease nipple (57) at one end and extends into the stop pin shaft (53).

7. A split-body high-pressure cementing head according to claim 6, characterized in that: The position indicator (7) further comprises a position indicating hole plug (75) arranged at the opening on the outer side of the position indicating body (74), a position indicating shaft (77) rotatably arranged in the opening on the outer side of the position indicating body (74), and a position indicating stop pin (76) arranged on the position indicating shaft (77), the position indicating stop pin (76) extends into the cavity of the position indicating body (74), one end of the position indicating shaft (77) extends out of the position indicating body (74) and is provided with a position indicating rod (79), an open pin (710) is arranged on the position indicating rod (79), the other end of the position indicating shaft (77) is connected with a position indicating shaft plug (713) through a thrust ball bearing (711), and the position indicating shaft plug (713) extends out of the position indicating body (74), a nut (712) is screwed on the outer wall of the position indicating shaft plug (713) and tightly abuts against the outer wall of the position indicating body (74).

8. A split-body high-pressure cementing head according to claim 7, characterized in that: O-rings are arranged between the end of the stop pin (56) and the stop pin shaft (53), between the stop pin (56) and the stop pin barrel (55), between the position indicating hole plug (75) and the opening on the outer side of the position indicating body (74), and between the position indicating stop pin (76) and the position indicating body (74).

9. A split-body high-pressure cementing head according to claim 8, characterized in that: A convex plug (10) is arranged in the bottom opening of the four-way valve (11).

10. A split-body high-pressure cementing head according to claim 9, characterized in that: An oil pipe joint (9) or a pressure test joint (8) is connected to the bottom end of the position indicating body (74) through a wing nut.

Images