Double-seal grease-injectable blowout prevention box

Abstract

The utility model discloses a double-seal grease-injectable blowout prevention box which comprises a steering deviation-adjusting device, a sealing device and a grease injection device, the sealing device is arranged at the upper end of the steering deviation-adjusting device, and the double-seal grease-injectable blowout prevention box further comprises the grease injection device which is connected with the side wall of the sealing device. The sealing device is provided with a first packing below the connecting port of the grease injection device and the sealing device, and the sealing device is provided with a second packing above the connecting port of the grease injection device and the sealing device. The polish rod is adjusted through the steering deviation adjusting device, so that the polish rod is centered, and abrasion of rubber and the polish rod is reduced. By additionally arranging the grease injection device, lubrication of the upper sealing packing and the lower sealing packing is enhanced, abrasion of packing rubber is reduced, grease always exists in the sealing device, and the polish rod and the packing rubber can be better lubricated.

Description

Technical Field

[0001] The utility model relates to the technical field of anti-blowout devices, in particular to a double-sealed grease-injectable anti-blowout box. Background Art

[0002] As a sealing wellhead device, the blowout preventer box is connected to the polished rod of the drainage well at its upper end. The polished rod of the drainage well will cause the packing to wear and age continuously during its up and down reciprocating motion, resulting in a decrease in sealing performance. In addition, due to the high mineral content of the drainage water, it is easy to scale on the polished rod, which further aggravates the wear of the packing, causing the drainage water to flow out of the wellhead and cause environmental pollution. If it is not adjusted in time, the polished rod, blowout preventer box and wellhead tee may be worn out in severe cases.

[0003] The existing blowout preventer box devices have the following defects: the packing is a single packing rubber, a large number of packings need to be added, and damaged packing is inconvenient to remove; the sealing between the packing cavity and the rubber is not strong, and water and gas are prone to spray out from the wellhead during production; there is no oiling device, considering that the drainage water has a poor lubrication effect on the packing, and it is serious that butter needs to be applied frequently on the bare rod, which is prone to the safety problem of hitting fingers. In response to the above problems, this time the blowout preventer box is mainly optimized to enhance the sealing, reduce the risk of environmental pollution, reduce the number of packing replacements, thereby reducing the probability of lying in high-yield wells and gas loss, and ensure the continuity of drainage wells. At the same time, it reduces the workload of employees and improves work efficiency.

[0004] Publication (Announcement) No.: CN220203857U discloses a universal deflection-adjustable blowout-proof polished rod sealer. The position is moved by an eccentric sleeve, thereby realizing the universal deflection-adjustable function; when the polished rod is broken, the blowout-proof ball will be squeezed into the inner cavity of the blowout-proof body due to the action of the compression spring, and will be sprayed upward by the high-pressure oil in the well, so that the blowout-proof ball will sit on the lower side of the eccentric sleeve, which will reduce the pollution to the surrounding environment on the one hand, and avoid the harm to the surrounding workers on the other hand.

[0005] Publication (Announcement) No.: CN116291293A discloses a packing box sealing and blowout prevention device with adjustable deviation for a wellhead of an oil pumping unit, which avoids accidents such as personal injury and equipment damage and failure by increasing the safe distance between the packing box and the rope hanger; a sealing cover is added inside the packing box to make the packing box tightly sealed, preventing the pressure in the well from surging upward after the rod is broken, causing accidents such as personal injury and environmental pollution caused by splashing; a universal joint and a deviation adjustment device are added to adjust the wellhead position by 360°, which solves the problem of equipment failure caused by the deviation of the wellhead and the wear of the rod.

[0006] Publication (announcement) number: CN217106922U, discloses a double-cylindrical packing seal rod sealer, designed with a double-stage packing chamber, and sealed with a double-stage sealing method, so that the sealing effect of the wellhead is more stable, which can effectively reduce the time waste caused by packing wear and replacement, reduce labor and cost, and the ball adjustment structure increases the adjustment angle of the rod sealer.

[0007] The above-mentioned prior art does not provide grease injection measures, and grease can only be added to the bare rod manually, which is prone to safety problems such as hitting fingers. In addition, some packings are filled in the form of cylinders, which are not easy to remove and difficult to replace.

[0008] In short, the technical solutions of the above-disclosed technologies, the technical problems to be solved and the beneficial effects produced are all different from the present utility model. Regarding more technical features, technical problems to be solved and the beneficial effects of the present utility model, there is no technical inspiration in the above-disclosed technical documents. Utility Model Content

[0009] In view of the above-mentioned defects in the prior art, the purpose of the utility model is to provide a double-sealed grease-injectable anti-blowout box.

[0010] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0011] A double-sealed grease-injectable anti-blowout box comprises a steering adjustment device and a sealing device, wherein the sealing device is arranged at the upper end of the steering adjustment device, and further comprises a grease injection device, wherein the grease injection device is connected to the side wall of the sealing device; the sealing device is provided with a first packing below the connecting port between the grease injection device and the sealing device, and the sealing device is provided with a second packing above the connecting port between the grease injection device and the sealing device.

[0012] Furthermore, the first packing and the second packing are both double spiral packing rubbers.

[0013] Furthermore, the steering deviation adjustment device includes a ball head packing seat and a bottom connecting seat;

[0014] Specifically, a ball head is arranged at the lower end of the ball head packing seat, a ball head seat is arranged at the upper end of the bottom connecting seat, the ball head is seated in the ball head seat, and a first sealing ring is arranged between the ball head and the ball head seat;

[0015] Specifically, a force bearing seat is fixedly provided on the outer wall of the ball head packing seat, an adjustment pressure plate is embedded on the upper end of the force bearing seat, a flange is provided on the outer wall of the bottom connecting seat, and the adjustment pressure plate is connected to the flange of the bottom connecting seat by at least two evenly distributed adjustment bolts.

[0016] Furthermore, the sealing device also includes a packing tube, the inner wall of which is composed of a second cone seat, a convex pressure ring, and an internal threaded joint from top to bottom;

[0017] Specifically, the upper end of the inner wall of the ball head packing seat is a first cone seat, the first packing is arranged in the first cone seat, the internal thread joint is connected to the outer wall of the upper end of the ball head packing seat, and the convex pressure ring compacts the first packing;

[0018] Specifically, the second packing is arranged in the second conical seat, a top pressure cover is arranged at the upper end of the packing tube, and a pressure ring is arranged below the top pressure cover to compact the second packing.

[0019] Furthermore, the internal thread joint is provided with a fastening nail to strengthen the connection between the packing tube and the ball head packing seat.

[0020] Furthermore, the grease injection device comprises a connecting piece, a cylinder body, and a lead screw;

[0021] Specifically, the front end of the connecting piece is connected to the side wall of the packing tube and is located below the second packing, and the packing tube is provided with a grease injection through hole at the connection of the connecting piece;

[0022] Specifically, a one-way valve is provided in the connecting piece;

[0023] Specifically, the front end of the cylinder body is connected to the rear end of the connecting piece, a limit cover is provided at the rear end of the cylinder body, a piston is provided in the cylinder body, and a sealing gasket is provided between the cylinder body and the connecting piece;

[0024] Specifically, the lead screw passes through the limiting cover and is threadedly connected to the limiting rod. The front end of the lead screw is connected to the piston. A second sealing ring is provided between the piston and the inner wall of the cylinder body.

[0025] Furthermore, a connecting counterbore is provided at the rear end of the connecting piece, an axial through hole is provided at the bottom of the connecting counterbore, and a valve seat counterbore is provided at the front end of the connecting piece;

[0026] Specifically, a spring and a valve ball are arranged in the valve seat countersunk hole. The inner diameter of the spring is larger than the diameter of the grease injection hole, and the diameter of the valve ball is larger than the diameter of the axial through hole. The spring pushes the root tube in front and the valve ball in the back, so that the axial through hole is closed.

[0027] Furthermore, the grease injection through hole on the packing tube is located in the projection area of ​​the valve seat counterbore.

[0028] Furthermore, the sealing gasket is arranged at the bottom of the connecting countersunk hole, the front end of the cylinder body is connected to the hole wall of the connecting countersunk hole, and the sealing gasket is pressed tightly.

[0029] Furthermore, at least two grease injection devices are provided and are evenly distributed on the side wall of the sealing device.

[0030] Compared with the prior art, the utility model has the following beneficial effects:

[0031] 1. Adjust the polished rod through the steering adjustment device to center the polished rod and reduce the wear of the rubber and the polished rod.

[0032] 2. By optimizing the packing type, the structure of the stuffing cavity and the use of double spiral packing rubber in the sealing device, its sealing performance is enhanced, while the workload of employees replacing packing is reduced and the probability of high-yield wells lying down is reduced. The packing type and stuffing cavity are optimized from the original cylindrical type to a frustum type.

[0033] 3. By adding a grease injection device, the lubrication of the upper and lower sealing packings is enhanced to reduce the wear of the packing rubber. At the same time, a valve ball and spring are used to seal at the root, so that butter is always present in the sealing device cavity, and the polished rod and the packing rubber can be better lubricated. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic diagram of the structure of the double-sealed grease-injectable anti-spray box of the utility model;

[0035] Figure 2 It is a partial cross-sectional view of a double-sealed grease-injectable anti-blowout box of the utility model.

[0036] In the figure: 1. bare rod; 2. grease injection box; 3. fastening nail; 4. ball head packing seat; 5. adjustment bolt; 6. first packing; 7. bottom connecting seat; 8. ball head seat; 9. force bearing seat; 10. adjustment pressure plate; 11. second packing; 12. packing tube; 13. top pressure cover; 14. pressure ring; 15. lead screw; 16. limit cover; 17. cylinder body; 18. sealing gasket; 19. valve ball; 20. connecting piece; 21. piston. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0038] Embodiment 1:

[0039] See also Figure 1 to Figure 2 The utility model provides a double-sealed grease-injected blowout prevention box, which is used in coalbed methane well pumping operations and is intended to enhance sealing, reduce environmental pollution risks, reduce the number of packing replacements, thereby reducing the probability of high-yield wells lying and gas loss, while at the same time reducing employee workload and improving work efficiency.

[0040] It includes a steering deviation adjustment device, a sealing device, and a grease injection device. The steering deviation adjustment device is used to adjust the light rod to center the light rod and reduce the wear of the light rod and the packing. The sealing device includes a first packing 6 and a second packing 11. The first packing 6 and the second packing 11 are both double-helix packing rubbers. The first packing 6 is arranged in the steering deviation adjustment device, and the second packing 11 is arranged in the sealing device. The grease injection device is connected to the side wall of the sealing device, and the connecting port is located below the second packing 11, so that butter is always present in the cavity of the sealing device, so that the first packing 6, the second packing 11 and the light rod 1 can be better lubricated. The mineral content of the drainage water is high, and it is easy to scale on the light rod 1, which aggravates the wear of the first packing 6 and the second packing 11, thereby causing serious eccentric wear of the light rod 1. The use of double-helix packing rubber has a better straightening effect on the light rod 1 than the original single seal, reducing the workload of employees in adjusting the eccentric wear at the wellhead.

[0041] Furthermore, the steering deviation adjustment device includes a ball head packing seat 4 and a bottom connection seat 7. A ball head is provided at the lower end of the ball head packing seat 4, a ball head seat 8 is provided at the upper end of the bottom connection seat 7, the ball head sits in the ball head seat 8, a first sealing ring is provided between the ball head and the ball head seat 8, a force bearing seat 9 is fixedly provided on the outer wall of the ball head packing seat 4, a deviation adjustment pressure plate 10 is nested at the upper end of the force bearing seat 9, a flange is provided on the outer wall of the bottom connection seat 7, the deviation adjustment pressure plate 10 is connected to the flange of the bottom connection seat 7 by at least two evenly distributed deviation adjustment bolts 5, and the deviation angle of the ball head packing seat 4 is adjusted by adjusting the screwing amount of the deviation adjustment bolts 5. In the daily maintenance process, it is only necessary to adjust the steering deviation adjustment device to keep the light rod centered, reduce the wear of the first packing 6, the second packing 11 and the light rod 1, and reduce the workload of employees.

[0042] Furthermore, the sealing device also includes a packing tube 12, the inner wall of the packing tube 12 is composed of a second conical seat, a convex pressure ring, and an internal threaded joint from top to bottom, the upper end of the inner wall of the ball head packing seat 4 is a first conical seat, the first packing 6 is arranged in the first conical seat, the internal threaded joint is connected to the outer wall of the upper end of the ball head packing seat 4, the convex pressure ring compacts the first packing 6, the internal threaded joint is provided with a fastening nail 3 to strengthen the connection between the packing tube 12 and the ball head packing seat 4, the second packing 11 is arranged in the second conical seat, a top pressure cover 13 is provided at the upper end of the packing tube 12, and a pressure ring 14 is provided below the top pressure cover 13 to compact the second packing 11.

[0043] Further, the grease injection device includes a connector 20, a cylinder 17, and a lead screw 15. The front end of the connector 20 is connected to the side wall of the packing tube 12 and is located below the second packing 11. The packing tube 12 is provided with a grease injection through hole at the connection of the connector 20. A one-way valve is provided in the connector 20 to prevent the grease in the packing tube 12 from overflowing. The front end of the cylinder 17 is connected to the rear end of the connector 20. A limit cover 16 is provided at the rear end of the cylinder 17. A piston 21 is provided in the cylinder 17. The lead screw 15 passes through the limit cover 16 and is threadedly connected to the limit rod 16. The front end of the lead screw 15 is connected to the piston 21. A second sealing ring is provided between the piston 21 and the inner wall of the cylinder 17. A sealing gasket 18 is provided between the cylinder 17 and the connector 20. The piston 21 moves with the screw 15 when it is screwed in and out, and the limit cover 16 plays a role of guiding and limiting.

[0044] Specifically, a connecting countersunk hole is provided at the rear end of the connecting piece 20, an axial through hole is provided at the bottom of the connecting countersunk hole, a valve seat countersunk hole is provided at the front end of the connecting piece 20, the grease injection through hole is located in the projection area of ​​the valve seat countersunk hole, a spring and a valve ball 19 are provided in the valve seat countersunk hole, the inner diameter of the spring is larger than the diameter of the grease injection through hole, the diameter of the valve ball is larger than the diameter of the axial through hole, the spring pushes the root tube 12 in front and pushes the valve ball 19 in the back, so that the axial through hole is closed, the sealing gasket 18 is provided at the bottom of the connecting countersunk hole, the front end of the cylinder body 17 is connected to the wall of the connecting countersunk hole, and the sealing gasket 18 is pressed tightly.

[0045] A valve ball 19 and a spring are used to seal the root of the grease injection device. By regularly adding oil, the first packing 6, the second packing 11 and the polished rod 1 can be better lubricated, which not only reduces the wear of the rubber packing, but also forms an oil film on the polished rod 1 to reduce the scaling of the drainage water on the polished rod, thereby extending the service life of the polished rod 1.

[0046] Furthermore, at least two grease injection devices are provided, evenly distributed on the side wall of the packing tube 12, so that the grease reserve is increased and the grease injection cycle is extended.

[0047] Embodiment 2:

[0048] This embodiment provides a method for using a double-sealed grease-injectable blowout-proof box, which specifically includes the following steps:

[0049] S1. Connect the bottom connection seat 7 of the steering deviation adjustment device to the wellhead spool; install the first packing 6, the packing tube 12, the second packing 11, the pressure ring 14, the top pressure cover 13 in sequence, and tighten the nail 3;

[0050] Adjust the piston 21 to the limit cover 16, add butter into the cylinder 17, connect the connecting piece 20 with the cylinder 17 to form a grease injection device, and connect the connecting piece 20 with the packing tube 12;

[0051] S2, lower the polished rod 1, screw in the lead screw 15, and use the piston 21 to press the butter in the cylinder 17 through the valve ball 19 and enter the packing tube 12 to lubricate the polished rod 1, the first packing 6, and the second packing 11;

[0052] S3, adjust the tilt angle of the ball head packing seat 4 by adjusting the deviation bolt 5 to avoid eccentric wear;

[0053] S4, when replenishing grease, lift the polished rod 1 onto the wellhead sealer, seal the wellhead, remove the grease injection device from the packing tube 12, and seal the connection port with a sealing plug;

[0054] Remove the connector 20, return the piston 21, add butter, press the connector 20, install it back on the packing tube 12, and open the sealer to start production.

[0055] All components and connection methods of components not discussed in this application belong to the known technologies in this technical field and can be directly applied without further explanation.

[0056] In the present invention, the term "plurality" means two or more than two, unless otherwise clearly defined. The terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0057] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by terms such as "up", "down", "left", "right", "front" and "back" are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, cannot be understood as a limitation on the present invention.

[0058] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0059] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A double-sealed grease-injectable anti-spray box, comprising a steering deviation adjustment device and a sealing device, wherein the sealing device is arranged at the upper end of the steering deviation adjustment device, and is characterized in that: It also includes a grease injection device, which is connected to the side wall of the sealing device; The sealing device is provided with a first packing below the connection port between the grease injection device and the sealing device, and the sealing device is provided with a second packing above the connection port between the grease injection device and the sealing device; The steering deviation adjustment device includes a ball head packing seat and a bottom connecting seat; A ball head is arranged at the lower end of the ball head packing seat, a ball head seat is arranged at the upper end of the bottom connecting seat, the ball head is seated in the ball head seat, and a first sealing ring is arranged between the ball head and the ball head seat; A force bearing seat is fixedly arranged on the outer wall of the ball head packing seat, a bias adjustment pressure plate is embedded on the upper end of the force bearing seat, a flange is arranged on the outer wall of the bottom connecting seat, and the bias adjustment pressure plate is connected to the flange of the bottom connecting seat by at least two evenly distributed bias adjustment bolts.

2. The double-sealed grease-filled anti-spray box according to claim 1 is characterized in that: The first packing and the second packing are both double spiral packing rubbers.

3. The double-sealed grease-filled anti-spray box according to claim 1 is characterized in that: The sealing device also includes a packing tube, the inner wall of which is composed of a second cone seat, a convex pressure ring, and an internal threaded joint from top to bottom; The upper end of the inner wall of the ball head packing seat is a first cone seat, the first packing is arranged in the first cone seat, the internal thread joint is connected to the outer wall of the upper end of the ball head packing seat, and the convex pressure ring compacts the first packing; The second packing is arranged in the second conical seat, a top pressure cover is arranged at the upper end of the packing tube, and a pressure ring is arranged below the top pressure cover to compact the second packing.

4. The double-sealed grease-filled anti-spray box according to claim 3 is characterized in that: The internal thread joint is provided with a fastening nail to strengthen the connection between the packing pipe and the ball head packing seat.

5. The double-sealed grease-injectable blowout-proof box according to claim 1, characterized in that: The grease injection device comprises a connecting piece, a cylinder body and a lead screw; The front end of the connecting piece is connected to the side wall of the packing tube and is located below the second packing. The packing tube is provided with a grease injection through hole at the connection of the connecting piece. A one-way valve is provided in the connecting piece; The front end of the cylinder body is connected to the rear end of the connecting piece, a limit cover is provided at the rear end of the cylinder body, a piston is provided in the cylinder body, and a sealing gasket is provided between the cylinder body and the connecting piece; The lead screw passes through the limit cover and is threadedly connected to the limit rod. The front end of the lead screw is connected to the piston. A second sealing ring is provided between the piston and the inner wall of the cylinder body.

6. The double-sealed grease-injectable anti-spray box according to claim 5, characterized in that: The rear end of the connector is provided with a connecting counterbore, the bottom of the connecting counterbore is provided with an axial through hole, and the front end of the connector is provided with a valve seat counterbore; A spring and a valve ball are arranged in the valve seat countersunk hole. The inner diameter of the spring is larger than the diameter of the grease injection hole, and the diameter of the valve ball is larger than the diameter of the axial through hole. The spring pushes the root tube in front and the valve ball in the back, so that the axial through hole is closed.

7. The double-sealed grease-injectable blowout-proof box according to claim 6, characterized in that: The grease injection through hole on the packing tube is located in the projection area of ​​the valve seat counterbore.

8. The double-sealed grease-filled anti-spray box according to claim 6, characterized in that: The sealing gasket is arranged at the bottom of the connecting countersunk hole, the front end of the cylinder body is connected to the hole wall of the connecting countersunk hole, and the sealing gasket is pressed tightly.

9. The double-sealed grease-filled anti-spray box according to any one of claims 1 to 8, characterized in that: At least two grease injection devices are arranged and evenly distributed on the side wall of the sealing device.

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