Hydraulic rubber gate and using method thereof

Abstract

The invention discloses a hydraulic rubber gate and a using method thereof.The hydraulic rubber gate comprises a center pipeline and further comprises a sealing pipe and a hydraulic oil cavity, the sealing pipe transversely penetrates through the center pipeline, and a sealing cavity is formed in the sealing pipe; two elastic telescopic sealing units are arranged in a sealing cavity of the sealing pipe. The hydraulic oil cavity is communicated with the sealing cavity through an H-shaped pipeline, and a pressure relief mechanism and a pressing mechanism are arranged in the H-shaped pipeline. A hydraulic rubber gate is installed on an oil well mouth to replace an original rubber gate, the sealing effect can be effectively improved, misoperation of workers is prevented, and the purposes of equipment safety and essence and oil well clean production are achieved. Meanwhile, after the device is used, the staff do not need to carry related tools when engaged in related work, and operation of the staff is facilitated.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of polished rod sealers, in particular to a hydraulic rubber gate and a use method thereof. BACKGROUND

[0002] At present, most of the known oil extraction wells are pumping unit wells, and a rubber gate is arranged below the wellhead packing box, which is an emergency sealing device. Generally, the rubber gate needs to be closed first during the replacement of the packing to play the role of the polished rod centering of the wellhead sealing box. During the daily operation process, it is possible that the worker does not close the rubber gate tightly or the opening degree of the left and right gates is uneven, and the rubber gate is forgotten to be opened before the well is opened, which leads to the rubber gate sealing not being tight, the sealing rubber being worn, and the like, which may cause the leakage of crude oil at the wellhead, environmental pollution, and even personal injury. In view of such problems, a "hydraulic rubber gate" is designed.

[0003] Publication (announcement) No. CN106958431B discloses an environmentally friendly and efficient polished rod sealer and a packing replacement method thereof, and belongs to the technical field of oil field equipment wellhead matching devices. It is composed of an upper longitudinal polished rod main sealing assembly, a middle transverse rubber sealing assembly, and a bottom offsetting and straightening assembly. The bottom offsetting and straightening assembly, the middle transverse rubber sealing assembly, and the upper longitudinal polished rod main sealing assembly are sequentially sleeved on the polished rod from bottom to top through the middle through hole. The rubber gate and the packing box are organically combined together, the height of the wellhead is reduced, the manufacturing cost is saved, the functions of automatic anti-inclination and universal offsetting are achieved, and the existing sealing device is not needed to be put empty when replacing the packing. Only the pressure cap needs to be rotated to replace the packing, the cumbersome method of using a pick and other tools to pry out the waste packing from the packing cavity is omitted, and the operation is convenient, time-saving, labor-saving, environmentally friendly, efficient, and durable.

[0004] The existing technology has the problems that during the daily operation process, the worker may not close the rubber gate tightly or the opening degree of the left and right gates is uneven, and the rubber gate is forgotten to be opened before the well is opened, which leads to the rubber gate sealing not being tight, the sealing rubber being worn, and the like, which may cause the leakage of crude oil at the wellhead, environmental pollution, and even personal injury.

[0005] The wellhead sealing device includes: a work four-way, which is in communication with a Christmas tree at a lower portion; a blowout pipe, which is connected to an upper portion of the work four-way and in which a sucker rod connected with the polished rod can reciprocate; a packing box, which is installed at an upper portion of the blowout pipe and through which the polished rod passes; two gate valves, which are respectively installed at left and right sides of the work four-way and can be switched between an open state and a closed state; and two gate seal ware assemblies, which are in communication with the two gate valves in a one-to-one correspondence and each of which includes a shell and a gate plate movably arranged in the shell; wherein, when the gate valve is in the open state, the gate plate can extend into the work four-way and clamp the sucker rod from both sides of the sucker rod, thereby cutting off the fluid communication between the upper portion and the lower portion of the work four-way. Through the wellhead sealing device, the cost of replacing the polished rod of a heavy oil thermal recovery well can be reduced, and the production rate of the oil well can be improved.

[0006] In the prior art, there are problems that, in the daily operation process, the rubber gate may not be closed tightly or the opening degrees of the left and right rubber gates may not be uniform, and the rubber gate may not be opened before the well is opened, which leads to the problems of poor sealing of the rubber gate, wear of the sealing rubber, and the like, and may cause leakage of crude oil at the wellhead, environmental pollution, and even personal injury.

[0007] The application discloses an automatic packing and polished rod sealing device, and belongs to the technical field of oil extraction equipment.

[0008] In the prior art, there are problems that, in the daily operation process, the rubber gate may not be closed tightly or the opening degrees of the left and right rubber gates may not be uniform, and the rubber gate may not be opened before the well is opened, which leads to the problems of poor sealing of the rubber gate, wear of the sealing rubber, and the like.

[0009] In summary, the technical solutions, the technical problems to be solved and the beneficial effects of the above disclosed technologies are different from those of the present application. The above disclosed technology documents do not have technical inspiration for more technical features, technical problems to be solved and beneficial effects of the present application. SUMMARY

[0010] In view of the above defects existing in the prior art, the purpose of the present application is to provide a hydraulic rubber gate and its using method, which replaces the original packing box rubber gate, the device uses hydraulic oil to cooperate with the sealing rubber to realize the sealing of the polished rod, and the two hydraulic cavities are connected with each other, so that the forces on the left and right sides are uniform, and the uneven opening of the left and right gate is avoided; the spring is arranged in the hydraulic cavity, and the sealing rubber on both sides can be opened when pressure is released, so as to avoid the wear of the sealing rubber caused by the misoperation of workers and affect the service life. Ultimately, the sealing effect of the rubber gate is effectively improved by using the device, the damage of the equipment caused by the misoperation of workers and the influence on the service life of the equipment are prevented, the safety of the equipment is realized, and the purpose of ensuring clean production of oil wells is achieved.

[0011] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0012] A hydraulic rubber gate, comprising a central pipeline, further comprising a sealing pipe and a hydraulic oil cavity, the sealing pipe transversely passes through the central pipeline, and the inside of the sealing pipe is a sealing cavity; two elastic expansion sealing units are arranged in the sealing cavity of the sealing pipe; the hydraulic oil cavity is connected with the sealing cavity through an H-shaped pipeline, and a pressure relief mechanism and a pressure mechanism are arranged in the H-shaped pipeline.

[0013] Further, the two elastic expansion sealing units are divided into a front elastic expansion sealing unit and a rear elastic expansion sealing unit.

[0014] Specifically, the front elastic expansion sealing unit and the rear elastic expansion sealing unit are the same in structure and are symmetrically arranged.

[0015] Further, the front elastic expansion sealing unit or the rear elastic expansion sealing unit comprises sealing rubber, a partition plate and a spring.

[0016] Specifically, the top end of the spring is connected with the bottom surface of the partition plate, and the bottom end is connected with the front end wall or the rear end wall of the sealing cavity; after the hydraulic oil enters the sealing cavity, the spring is in a stretched state.

[0017] Specifically, the sealing rubber is arranged on the top surface of the partition plate, and the sealing rubber and the partition plate can slide along the inner wall of the sealing cavity.

[0018] Specifically, at least two small holes are arranged on the partition plate and are uniformly distributed; the center of the sealing rubber and the partition plate is in a semicylindrical shape.

[0019] Further, the sealing rubber of the front elastic expansion sealing unit and the sealing rubber of the rear elastic expansion sealing unit can seal the polished rod after being spliced.

[0020] Specifically, the two sealing rubbers divide the sealing cavity into three cavities, namely a front cavity, a polished rod cavity and a rear cavity.

[0021] Further, the "H" shaped pipeline is divided into one port, two ports, three ports, four ports;

[0022] Specifically, the one port is in communication with the front cavity, the two port is in communication with the rear cavity, the three port is in communication with the pressure relief mechanism, the four port is in communication with the pressing mechanism, and the hydraulic oil cavity is provided with an oil injection port.

[0023] Further, the pressure relief mechanism comprises a pressure relief pipe, a pressure relief switch and a pressure rod.

[0024] Specifically, the pressure relief pipe communicates the three port with the hydraulic oil cavity, the pressure relief switch is arranged in the pressure relief pipe, and the pressure rod is connected with the pressure relief switch to open and close the pressure relief switch.

[0025] Further, the pressing mechanism comprises an oil pressing pipe, an oil suction pipe, an oil suction cavity and a cam rocker.

[0026] Specifically, the oil pressing pipe communicates the four port with the oil suction cavity, the oil suction pipe communicates the oil suction cavity with the hydraulic oil cavity, and the cam of the cam rocker is arranged in the oil suction cavity.

[0027] Specifically, a first one-way valve is arranged in the oil pressing pipe to prevent the hydraulic oil from returning to the oil suction cavity, and a second one-way valve is arranged in the oil suction pipe to prevent the hydraulic oil from returning to the hydraulic oil cavity.

[0028] Specifically, the cam is provided with a large-diameter circle and a small-diameter circle, the oil suction pipe is provided with a large-diameter ring and a small-diameter ring, the large-diameter circle is sealed in cooperation with the large-diameter ring, the small-diameter circle is sealed in cooperation with the small-diameter ring, the oil suction pipe and the oil pressing pipe are arranged on the large-diameter ring, and the oil pressing pipe is arranged between the small-diameter ring and the oil suction pipe.

[0029] Further, the hydraulic oil cavity is connected with the outer wall of the sealing pipe, and the "H" shaped pipeline is arranged in the hydraulic oil cavity.

[0030] Further, the upper end of the sealing pipe is connected with the packing box.

[0031] In order to achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0032] A use method of a hydraulic rubber gate, comprising the following steps,

[0033] S1, a hydraulic rubber gate device is passed through a polished rod and installed below a packing box;

[0034] S2, hydraulic oil is added to the hydraulic oil cavity through an oil injection hole on the outer surface of the hydraulic oil cavity;

[0035] S3, by swinging up and down of the cam rocker, the hydraulic oil in the hydraulic oil cavity is hit into the sealing cavity, so that the sealing rubber of the front or rear elastic expansion sealing unit is tightly combined with the polished rod until the cam rocker cannot be shaken;

[0036] S4, when pressure relief is needed after operation, the pressure rod is pressed down, the hydraulic oil in the sealing cavity is returned to the hydraulic oil cavity through the pressure relief switch.

[0037] Compared with the prior art, the present application has the following beneficial effects:

[0038] The "hydraulic rubber gate" is installed at the wellhead of an oil well to replace the original rubber gate, which can effectively improve the sealing effect and prevent misoperation of workers, and achieves the purpose of device safety and clean production of oil wells. Meanwhile, after using the device, workers do not need to carry related tools when engaging in related work, thereby facilitating the operation of workers. BRIEF DESCRIPTION OF DRAWINGS

[0039] Fig. 1 is a shaft side view of the hydraulic rubber gate of the present application;

[0040] Fig. 2 is a schematic view of the internal structure of the hydraulic rubber gate of the present application;

[0041] Fig. 3 is a schematic view of the pressing mechanism of the hydraulic rubber gate of the present application;

[0042] In the figure: 1, sealing cavity; 2, hydraulic oil cavity; 3, sealing rubber; 4, small hole; 5, partition plate; 6, spring; 7, cam rocker; 8, piston; 9, first check valve; 10, pressure rod; 11, pressure relief switch; 12, second check valve; 13, packing box; 14, polished rod. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0044] Embodiment 1:

[0045] Please refer to Figs. 1 to 3 The hydraulic rubber gate provided by the present application comprises a central pipeline, further comprises a sealing pipe and a hydraulic oil cavity 2, the sealing pipe passes through the central pipeline, and the axis of the sealing pipe is perpendicular to the axis of the central pipeline, the sealing pipe is a closed pipe, and the inside is a sealing cavity 1, and the hydraulic oil cavity 2 is in communication with the front end and the rear end of the sealing pipe respectively.

[0046] The sealing tube upper end connects the packing box 13.

[0047] The sealing cavity 1 of the sealing tube is internally provided with two elastic expansion sealing units, which are divided into front and rear elastic expansion sealing units, and the front and rear elastic expansion sealing units are the same structure and symmetrically arranged.

[0048] The front or rear elastic expansion sealing unit comprises a sealing rubber 3, a partition plate 5 and a spring 6, the top end of the spring 6 is connected with the bottom surface of the partition plate 5, the bottom end is connected with the front end wall of the sealing cavity 1 or the rear end wall of the sealing cavity 1, the sealing rubber 3 is arranged on the top surface of the partition plate 5, the sealing rubber 3 and the partition plate 5 can slide along the inner wall of the sealing cavity 1, at least two small holes 4 are arranged on the partition plate 5 and uniformly distributed, and the center of the sealing rubber 3 and the partition plate 5 is a semicylindrical shape.

[0049] The sealing rubber of the front elastic expansion sealing unit and the sealing rubber of the rear elastic expansion sealing unit can seal the polished rod 14 after being spliced, and the two sealing rubbers 3 divide the sealing cavity 1 into three cavities, i.e. a front cavity, a polished rod cavity and a rear cavity.

[0050] The spring 6 is in a stretched state.

[0051] The partition plate 5 cannot uniformly apply force to the bottom end of the sealing rubber 3, so the small holes 4 are arranged to make the two sealing rubbers 3 completely adhere to the polished rod 14 by hydraulic pressure.

[0052] The hydraulic oil cavity 2 is communicated with the sealing cavity 1 through an “H” shaped pipeline, the “H” shaped pipeline is divided into one port, two ports, three ports and four ports, the one port is communicated with the front cavity, the two ports are communicated with the rear cavity, the three ports are communicated with the pressure relief mechanism, the four ports are communicated with the pressure mechanism, and the hydraulic oil cavity 2 is provided with an oil inlet.

[0053] The pressure relief mechanism comprises a pressure relief pipe, a pressure relief switch 22 and a pressure rod 10, the pressure relief pipe communicates the three ports with the hydraulic oil cavity 2, the pressure relief switch 22 is arranged in the pressure relief pipe, the pressure rod 10 is connected with the pressure relief switch, and the pressure rod 10 is used to open and close the pressure relief switch 11.

[0054] The pressing mechanism comprises an oil pressing pipe, an oil suction pipe, an oil suction cavity and a cam rocker 7; the oil pressing pipe is communicated with the four-port and the oil suction cavity, the oil suction pipe is communicated with the oil suction cavity and the hydraulic oil cavity 2, the cam of the cam rocker 7 is arranged in the oil suction cavity, a first one-way valve 9 is arranged in the oil pressing pipe to prevent the hydraulic oil from returning to the oil suction cavity, a second one-way valve 12 is arranged in the oil suction pipe to prevent the hydraulic oil from returning to the hydraulic oil cavity 2, the cam is provided with a large-diameter circle and a small-diameter circle, the oil suction pipe is provided with a large-diameter ring and a small-diameter ring, the large-diameter circle is sealed in cooperation with the large-diameter ring, the small-diameter circle is sealed in cooperation with the small-diameter ring, the oil suction pipe and the oil pressing pipe are arranged on the large-diameter ring, and the oil pressing pipe is arranged between the small-diameter ring and the oil suction pipe.

[0055] Through the reciprocating movement of the cam rocker 7, the pressurization function is realized in cooperation with the first and second one-way valves (9, 12); when the sealing cavity 1 is pressed, the partition plate 5 of the front elastic expansion sealing unit or the rear elastic expansion sealing unit is tightly attached to the sealing rubber 3 and the light rod 14, thereby playing a sealing role, and the partition plate 5 also plays a shaping role, thereby assisting the sealing rubber 3 to tightly attach to the light rod; the hydraulic oil is extruded to the sealing rubber through the small hole 4 to make the sealing rubber be deformed to a certain extent, thereby ensuring the sealing effect.

[0056] When the pressure is released, the lower pressing rod 10 opens the pressure release switch to realize the pressure release of the sealing cavity, thereby achieving the effect of releasing the sealing. After the sealing cavity 1 is released, the partition plate 5 moves to both ends of the sealing cavity 1 to be away from the light rod 14, thereby releasing the sealing effect and restoring the normal production.

[0057] The device utilizes the hydraulic oil to cooperate with the sealing rubber 3 to realize the sealing, and the separated front cavity and rear cavity are communicated through the “H”-shaped pipeline, thereby realizing the uniform force on both sides of the light rod 14 and avoiding the uneven opening of the left and right gate; the spring 6 is arranged in the hydraulic cavity 1, and the sealing rubber 3 on both sides can be opened when the pressure is released, thereby avoiding the wear of the sealing rubber caused by the misoperation of workers and affecting the service life. Through the use of the device, the sealing effect of the rubber gate 3 can be improved, the misoperation of workers can be avoided, the labor intensity of workers can be reduced, and the purpose of ensuring the clean production of oil wells can be achieved.

[0058] Embodiment 2

[0059] The embodiment provides a specific use method of the gate:

[0060] S1, a hydraulic rubber gate device is passed through a light rod and installed below a packing box 13;

[0061] S2, hydraulic oil is added to the hydraulic oil cavity 2 through an oil injection hole on the outer surface of the hydraulic oil cavity 2;

[0062] S3, the hydraulic oil in the hydraulic oil cavity 2 is hit into the sealing cavity 1 by up and down swinging of the cam rocker 7, so that the sealing rubber 3 of the front elastic expansion sealing unit or the rear elastic expansion sealing unit is tightly combined with the light rod 14 until the cam rocker 7 cannot be shaken.

[0063] S4, when the operation is completed and pressure relief is needed, the pressure rod 10 is pressed down, the hydraulic oil of the sealed cavity 1 is returned to the hydraulic oil cavity 2 through the pressure relief switch 11;

[0064] S5, the oil well is opened.

[0065] Embodiment 3:

[0066] On the basis of embodiment 1, the integration of the gate is improved in this embodiment, the hydraulic oil cavity 2 is connected with the outer wall of the sealing pipe, and the “H” shaped pipeline is arranged in the hydraulic oil cavity 2. After the arrangement, there is no exposed pipeline, the appearance neatness of the gate is improved, and the space occupation is reduced.

[0067] In the present application, the parts themselves which are not discussed in detail, and the connection modes of the parts in the present application all belong to the known technology in the technical field. Direct application can be used, and no further description is given.

[0068] In the present application, the term “a plurality of” refers to two or more, unless otherwise explicitly limited. The terms “mounting”, “connecting”, “connecting”, “fixing” and the like should be understood in a broad sense, for example, “connecting” can be fixed connection, or detachable connection, or integral connection; “connecting” can be direct connection, or indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0069] In the description of the present application, it should be understood that the terms “upper”, “lower”, “left”, “right”, “front”, “back” and the like indicate the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the device or unit referred to must have a particular direction, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the present application.

[0070] In the description of the present application, the terms “one embodiment”, “some embodiments”, “a specific embodiment” and the like mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description 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.

[0071] The above merely provides the preferred embodiments of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the principles and technical scope of the present application shall fall into the scope of the present application.

Claims

1. A hydraulic rubber gate, comprising a central pipe, characterized in that, It also includes sealing pipes and hydraulic oil chambers; The sealing tube passes laterally through the central pipe, and the interior of the sealing tube is a sealing cavity; The sealing cavity of the sealing tube is provided with two elastic telescopic sealing units; The hydraulic oil chamber is connected to the sealing chamber through an "H"-shaped pipe, and the "H"-shaped pipe is equipped with a pressure relief mechanism and a pressure boosting mechanism.

2. A hydraulic rubber gate according to claim 1, characterized in that, The two elastic telescopic sealing units are divided into a front elastic telescopic sealing unit and a rear elastic telescopic sealing unit. The front elastic telescopic sealing unit and the rear elastic telescopic sealing unit have the same structure and are arranged symmetrically.

3. A hydraulic rubber gate according to claim 2, characterized in that, The front or rear elastic telescopic sealing unit includes a sealing rubber, a partition, and a spring. The top end of the spring is connected to the bottom surface of the partition plate, and the bottom end is connected to the front wall or the rear wall of the sealing cavity; after the hydraulic oil enters the sealing cavity, the spring is in a stretched state. The sealing rubber is disposed on the top surface of the partition, and the sealing rubber and the partition can slide along the inner wall of the sealing cavity; The partition has at least two evenly distributed small holes; the sealing rubber and the center of the partition are semi-cylindrical.

4. A hydraulic rubber gate according to claim 3, characterized in that, The sealing rubber of the front elastic telescopic sealing unit and the sealing rubber of the rear elastic telescopic sealing unit can seal the bare rod when they are combined. The two sealing rubber sheets divide the sealing cavity into three chambers: the front chamber, the smooth rod chamber, and the rear chamber.

5. A hydraulic rubber gate according to claim 4, characterized in that, The "H"-shaped pipe is divided into one-port, two-port, three-port, and four-port types. The first port is connected to the front cavity, the second port is connected to the rear cavity, the third port is connected to the pressure relief mechanism, the fourth port is connected to the pressure boosting mechanism, and the hydraulic oil cavity is provided with an oil injection port.

6. A hydraulic rubber gate according to claim 5, characterized in that, The pressure relief mechanism includes a pressure relief pipe, a pressure relief switch, and a pressure rod; The pressure relief pipe connects the three ports to the hydraulic oil chamber. The pressure relief switch is installed in the pressure relief pipe. The pressure rod is connected to the pressure relief switch, and the pressure relief switch is opened and closed by the pressure rod.

7. A hydraulic rubber gate according to claim 5, characterized in that, The pressurizing mechanism includes an oil pressure pipe, an oil suction pipe, an oil suction chamber, and a cam rocker arm; The pressure pipe connects the four ports to the oil suction chamber, the oil suction pipe connects the oil suction chamber to the hydraulic oil chamber, and the cam of the cam rocker is set in the oil suction chamber; The oil pressure pipe is equipped with a first check valve to prevent hydraulic oil from returning to the oil suction chamber, and the oil suction pipe is equipped with a second check valve to prevent hydraulic oil from returning to the hydraulic oil chamber. The cam is provided with a large diameter circle and a small diameter circle, and the oil suction pipe is provided with a large diameter ring and a small diameter ring. The large diameter circle and the large diameter ring are sealed together, and the small diameter circle and the small diameter ring are sealed together. The oil suction pipe and the oil pressure pipe are both provided on the large diameter ring, and the oil pressure pipe is provided between the small diameter ring and the oil suction pipe.

8. A hydraulic rubber gate according to any one of claims 1-7, characterized in that, The hydraulic oil chamber is connected to the outer wall of the sealing pipe, and the "H"-shaped pipe is installed inside the hydraulic oil chamber.

9. A hydraulic rubber gate according to any one of claims 1-7, characterized in that, The upper end of the sealing tube is connected to the packing box.

10. A method of using a hydraulic rubber gate, characterized in that, Includes the following steps, S1. A hydraulic rubber gate device is passed through the smooth rod and installed below the packing box; S2. Add hydraulic oil into the hydraulic oil chamber through the oil injection hole on the outer surface of the hydraulic oil chamber; S3. By swinging the cam rocker up and down, the hydraulic oil in the hydraulic oil chamber is pumped into the sealing chamber, so that the sealing rubber of the front elastic telescopic sealing unit or the rear elastic telescopic sealing unit is tightly combined with the smooth rod until the cam rocker can no longer be shaken. S4. When pressure needs to be released after operation, press down the pressure rod and use the pressure relief switch to return the hydraulic oil in the sealed chamber to the hydraulic oil chamber.

Images