Ultrahigh-pressure pressurizing grease injector

Abstract

The utility model discloses an ultrahigh pressure pressurization grease injector which comprises a lower cylinder body, a piston rod, an upper cylinder body, a check valve and a double-male connector, the lower cylinder body is connected with the upper cylinder body, a hydraulic cavity formed in the lower cylinder body is communicated with a sealing grease cavity formed in the upper cylinder body, and the piston rod is arranged in the hydraulic cavity and the sealing grease cavity in a sealing mode. The hydraulic cavity is communicated with the electric pump station so as to control the piston rod to move through the electric pump station; the check valve is communicated with the side face of the upper cylinder body and used for injecting sealing grease into the sealing grease cavity. The double-male connector communicates with the end, away from the lower cylinder body, of the upper cylinder body and is used for being connected with a grease injection valve to inject grease into the grease injection valve. The grease injector is simple in structure, grease injection is convenient, pressurized grease injection maintenance can be carried out on a 175 MPa ultrahigh pressure wellhead device, and safe and reliable 175 MPa ultrahigh pressure grease injection is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of maintenance and repair of wellhead devices and casing heads in the oil and gas industry, in particular to an ultra-high pressure boosting grease injector. Background Art

[0002] With the development of ultra-deep oil and gas wells in China, the pressure levels of wellhead equipment have continued to increase. Some blocks have begun using wellhead equipment with pressures up to 175 MPa. These wellhead gate valves require regular injection of sealing grease. However, gate valves in production are often pressurized. Conventional maintenance requires shutting down the well to release the pressure before maintenance, which significantly reduces production efficiency. The main valve cannot be maintained, posing a risk to production after the well is reopened. Existing wellhead pressurized grease injection equipment can only withstand a maximum pressure of 140 MPa, which is incapable of the ultra-high pressure of 175 MPa. Therefore, the development of a 175 MPa ultra-high pressure grease injection device has become a must-have for on-site pressurized maintenance. Utility Model Content

[0003] The purpose of the utility model is to provide an ultra-high pressure boosting grease injector, which is a new grease injector used to solve the technical problem that the pressure level of the grease injection equipment in the prior art cannot reach 175MPa ultra-high pressure.

[0004] The utility model solves the above problems through the following technical solutions:

[0005] A super-high-pressure booster grease injector comprises: a lower cylinder body, a piston rod, an upper cylinder body, a check valve and a double male connector, wherein the lower cylinder body and the upper cylinder body are connected, and the hydraulic chamber formed in the lower cylinder body is connected to the sealing grease chamber formed in the upper cylinder body, and the piston rod seal is arranged in the hydraulic chamber and the sealing grease chamber; the hydraulic chamber is connected to the electric pump station to control the movement of the piston rod through the electric pump station; the check valve is connected to the side of the upper cylinder body and is used to inject sealing grease into the sealing grease chamber; the double male connector is connected to one end of the upper cylinder body away from the lower cylinder body and is used to connect to the grease injection valve to inject grease to the grease injection valve.

[0006] As a further improvement, the double male connector is connected to the grease injection valve via an ultra-high pressure grease injection pipeline.

[0007] As a further improvement, when the grease injector is not in operation, the outlet end of the double male connector is covered with a protective cap.

[0008] As a further improvement, the protective cap is threadedly connected to the double male connector.

[0009] As a further improvement, a copper pad is provided between the end of the double male connector and the upper cylinder body.

[0010] As a further improvement, the grease injector further comprises: a rear hydraulic joint and a side hydraulic joint connected to the electric pump station,

[0011] The rear end hydraulic joint is connected to the end of the lower cylinder away from the upper cylinder body, and the side hydraulic joint is connected to the hydraulic chamber. The rear end hydraulic joint and the side hydraulic joint cooperate with each other to realize oil inlet and oil return.

[0012] As a further improvement, the side hydraulic joint is arranged on the side of the upper cylinder body and on the same side as the check valve.

[0013] As a further improvement, the radius of the hydraulic cavity is greater than the radius of the sealing grease cavity, and the outer diameter of the rear end of the piston rod is adapted to the radius of the hydraulic cavity.

[0014] As a further improvement, a first sealing component is provided outside the rear end of the piston rod;

[0015] and / or a second sealing component is provided between the lower cylinder body and the upper cylinder body;

[0016] And / or a third sealing component is provided between the outer front end of the piston rod and the upper cylinder body.

[0017] As a further improvement, the rear end hydraulic connector and the side hydraulic connector of the grease injector are connected to the electric pump station through high-pressure hoses to drive the piston rod;

[0018] And / or the check valve is connected to the grease injection device via a high-pressure hose to enable sealing grease to be added to the sealing grease cavity of the grease injector;

[0019] And / or the double male connector is connected to the grease injection valve via an ultra-high pressure hose, and a stop valve is provided on the ultra-high pressure hose.

[0020] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0021] The grease injector of the utility model has a simple structure, is convenient for grease injection, and can perform pressure grease injection maintenance on ultra-high pressure (175MPa) wellhead devices; it effectively utilizes existing grease injection devices to achieve safe and reliable ultra-high pressure (175MPa) grease injection. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a structural schematic diagram of an ultra-high pressure boost grease injector of the present utility model.

[0023] Figure numerals: 1. rear end hydraulic connector; 2. lower cylinder body; 3. first O-ring; 4. first retaining ring; 5. piston rod; 6. second O-ring; 7. third O-ring; 8. second retaining ring; 9. fourth O-ring; 10. upper cylinder body; 11. check valve; 12. copper gasket; 13. double male connector; 14. protective cap; 15. side hydraulic connector; A. hydraulic chamber; B. sealing grease chamber. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] Example

[0026] Combined with attachment Figure 1 As shown, an ultra-high pressure boost grease injector includes: a rear-end hydraulic joint 1, a lower cylinder 2, a piston rod 5, an upper cylinder 10, a check valve 11 and a double male joint 13, etc., wherein the lower cylinder 2 and the upper cylinder 10 are connected, and the hydraulic chamber formed in the lower cylinder 2 is connected to the sealing grease chamber formed in the upper cylinder 10, and the piston rod 5 is sealed in the hydraulic chamber A and the sealing grease chamber B; the rear-end hydraulic joint 1 is connected to the end of the lower cylinder 2 away from the upper cylinder 10; the check valve 11 is connected to the side of the upper cylinder 10, and the double male joint 13 is connected to the upper cylinder 1 0 is away from one end of the lower cylinder body 2; during operation, the rear end hydraulic connector 1 is connected to the electric pump station, and the front end double male connector 13 is connected to the grease injection valve. The sealing grease injection pipeline can be connected to the check valve 11 of the ultra-high pressure boosting grease injector in this embodiment through the existing grease injection device, and injected into the sealing grease cavity through the check valve 11. After the sealing grease cavity is filled with the sealing grease, the hydraulic oil of the electric pump station is connected to the hydraulic connector through the hydraulic pipeline to push the piston rod 5 to push the sealing grease out of the ultra-high pressure boosting grease injector, and is injected into the grease injection valve through the double male connector 13.

[0027] In this embodiment, the dual male connector 13 at the front end of the grease injector is connected to the grease injection valve via an ultra-high-pressure grease injection pipeline. When the grease injector is not in operation, the outlet end of the dual male connector 13 is covered with a protective cap 14, which is threadedly connected to the dual male connector 13 to seal the dual male connector 13 and the interior of the grease injector from dust. A sealing grease inlet is formed on the side of the upper cylinder body 10, and a check valve 11 is disposed at this sealing grease inlet to facilitate communication with the sealing grease chamber within the upper cylinder body 10. Preferably, a copper gasket 12 is also provided between the front end of the dual male connector 13 and the upper cylinder body 10 to reduce the impact force on the upper cylinder body 10 during operation.

[0028] Furthermore, the grease injector is also provided with a side hydraulic joint 15 connected to the hydraulic chamber, and the rear end hydraulic joint 1 and the side hydraulic joint 15 cooperate with each other to realize oil inlet and oil return, that is, when the piston rod 5 is pushed forward, the rear end hydraulic joint 1 takes in oil and the side hydraulic joint 15 returns oil; when the piston rod 5 retracts backward, the side hydraulic joint 15 takes in oil and the rear end hydraulic joint 1 returns oil.

[0029] Preferably, in this embodiment, the side hydraulic joint 15 is provided on the side of the upper cylinder body 10 and on the same side as the check valve 11 .

[0030] Specifically, the radius of the hydraulic chamber is greater than the radius of the sealing grease chamber; the outer diameter of the rear end of the piston rod 5 is adapted to the radius of the hydraulic chamber, and a first O-ring 3 and a first retaining ring 4 are provided on the rear end of the piston rod 5 as a first sealing component; the lower cylinder body 2 is threadedly connected to the upper cylinder body 10, and a second O-ring 6 and a third O-ring 7 are provided between the lower cylinder body 2 and the upper cylinder body 10 as a second sealing component; preferably, a fourth O-ring 9 and a second retaining ring 8 are provided between the front end of the piston rod 5 and the upper cylinder body 10 as a third sealing component. In this embodiment, the rear hydraulic connector 1, the side hydraulic connector 15, the double male connector 13, and the check valve 11 can all be connected and installed via threads. Of course, other installation methods can also be used, and this is not limited by the present invention.

[0031] The rear end hydraulic connector 1 and the side hydraulic connector 15 of the grease injector are connected to the double-circuit electric pump station through a high-pressure hose to drive the piston rod 5; the one-flow valve 11 is connected to the grease injection device through a high-pressure hose to add sealing grease into the sealing grease cavity of the grease injector; the double male connector 13 is connected to the grease injection valve through an ultra-high pressure hose, and a stop valve can be set on the ultra-high pressure hose to realize grease injection control.

[0032] The grease injector of the utility model can perform pressure grease injection maintenance on a 175MPa ultra-high-pressure wellhead device; the existing grease injection device is effectively utilized to realize safe and reliable 175MPa ultra-high-pressure grease injection.

[0033] Although the present invention is described herein with reference to the illustrative embodiments of the present invention, the above embodiments are merely preferred embodiments of the present invention, and the embodiments of the present invention are not limited to the above embodiments. It should be understood that those skilled in the art can design many other modifications and implementations, which will fall within the scope and spirit of the principles disclosed in this application.

Claims

1. An ultra-high pressure boost grease injector, characterized in that: include: The lower cylinder body, the piston rod, the upper cylinder body, the one-flow valve and the double male connector, wherein the lower cylinder body and the upper cylinder body are connected, and the hydraulic chamber formed in the lower cylinder body is connected to the sealing grease chamber formed in the upper cylinder body, and the piston rod seal is arranged in the hydraulic chamber and the sealing grease chamber; the hydraulic chamber is connected to the electric pump station to control the movement of the piston rod through the electric pump station; the one-flow valve is connected to the side of the upper cylinder body for injecting sealing grease into the sealing grease chamber; the double male connector is connected to the end of the upper cylinder body away from the lower cylinder body, and is used to connect to the grease injection valve to inject grease to the grease injection valve.

2. The ultra-high pressure boost grease injector according to claim 1, characterized in that: The double male connector is connected to the grease injection valve through an ultra-high pressure grease injection pipeline.

3. The ultra-high pressure boost grease injector according to claim 1, characterized in that: When the grease injector is not in operation, the outlet end of the double male connector is covered with a protective cap.

4. The ultra-high pressure boost grease injector according to claim 3, characterized in that: The protective cap is threadedly connected to the double male connector.

5. The ultra-high pressure boost grease injector according to claim 1, characterized in that: A copper pad is provided between the end of the double male joint and the upper cylinder body.

6. The ultra-high pressure boost grease injector according to claim 1, characterized in that: The grease injector also includes: a rear end hydraulic joint and a side hydraulic joint connected to the electric pump station, The rear end hydraulic joint is connected to the end of the lower cylinder away from the upper cylinder body, and the side hydraulic joint is connected to the hydraulic chamber. The rear end hydraulic joint and the side hydraulic joint cooperate with each other to realize oil inlet and oil return.

7. The ultra-high pressure boost grease injector according to claim 6, characterized in that: The side hydraulic joint is arranged on the side of the upper cylinder body and on the same side as the check valve.

8. The ultra-high pressure boost grease injector according to claim 1, characterized in that: The radius of the hydraulic cavity is greater than the radius of the sealing grease cavity, and the outer diameter of the rear end of the piston rod is adapted to the radius of the hydraulic cavity.

9. The ultra-high pressure boost grease injector according to claim 1, characterized in that: A first sealing component is provided outside the rear end of the piston rod; and / or a second sealing component is provided between the lower cylinder body and the upper cylinder body; And / or a third sealing component is provided between the outer front end of the piston rod and the upper cylinder body.

10. The ultra-high pressure boosting grease injector according to any one of claims 1 to 9, characterized in that: The rear end hydraulic joint and the side hydraulic joint of the grease injector are connected to the electric pump station through high-pressure hoses to drive the piston rod; And / or the check valve is connected to the grease injection device via a high-pressure hose to enable sealing grease to be added to the sealing grease cavity of the grease injector; And / or the double male connector is connected to the grease injection valve via an ultra-high pressure hose, and a stop valve is provided on the ultra-high pressure hose.

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