Wellhead sealing filler lubricating device

Abstract

The utility model relates to a lubricating device, belongs to the technical field of oil exploitation, and particularly discloses a lubricating device for wellhead gland packing, which comprises a shell, a sealing cover and a lubricating body, the shell is formed by sealing and enclosing a first shell and a second shell which are semi-tubular, the sealing cover is arranged above the shell, a polished rod hole is formed in the center of the sealing cover, and the lubricating body is arranged in the polished rod hole. The lower portion of the shell is connected with a wellhead blowout prevention box, a lubricating body is arranged in the shell and is an oil-immersed sponge, and sealing strips are fixedly arranged between the shell and the sealing cover, between the shell and the wellhead blowout prevention box and at the enclosed position of the first shell and the second shell. The lubricating device is simple in structure, safe, simple, convenient, time-saving and labor-saving in installation process of the shell, and suitable for lubrication of wellhead gland packing.

Description

TECHNICAL FIELD

[0001] The utility model relates to a lubricating device belongs to petroleum exploitation technical field, specifically is a wellhead sealing packing lubricating device. BACKGROUND

[0002] In the oilfield pumping unit production, the sealing packing arranged in the blowout preventer box is a very important sealing element, but the oilfield pollution caused by the sealing packing leakage often occurs, so the sealing element needs to be frequently replaced in production, which greatly increases the production and maintenance cost.

[0003] The main reason for the sealing packing leakage is the insufficient lubrication, so that the sealing packing is seriously worn when it rubs with the polished rod or other components in the production process of the pumping well, which shortens the service life of the sealing packing. In production, the blowout preventer box is usually lubricated when the pumping unit well is running normally, and the lithium-based grease is usually added temporarily to lubricate the gap between the blowout preventer box and the polished rod, but the lubricity cannot last for a long time, and with the extension of the production time, the sealing packing in the blowout preventer box is affected by the sulfide or polymer contained in the produced liquid, the water or water in the pumping unit well, the lithium-based grease is easily contaminated due to exposure, emulsification, etc., and the lubrication effect is greatly reduced.

[0004] At present, the research direction to solve this problem is to improve the lubricity of the packing, and the main means are: one, change the structure of the blowout preventer box and add a chamber inside as a lubricating device; two, add a connecting lubricating device outside the blowout preventer box. The above methods are to replace the simple method of applying lithium-based grease lubricant in the past, so that the polished rod brings the lubricant stored in the device into the sealing packing during operation to improve its lubricity, and solves the problem that lithium-based grease is easily contaminated and emulsified due to exposure in the air. But the above lubricating device still has problems: the blowout preventer box with lubricating device has complex structure, high cost, is not easy to maintain, and the modification of the equipment has a great influence on the Christmas tree, and this device is not suitable for all wellheads, so the practicality is poor; the lubricating device added outside the blowout preventer box is connected with the blowout preventer box by screw connection, so the pumping unit needs to be stopped and unloaded to install, and more operators are needed to complete the installation, the installation process is complex, the labor intensity of the employees is large, which causes low installation and replacement efficiency and many safety hazards. UTILITY MODEL CONTENTS

[0005] In order to solve the above problems in the prior art, the utility model aims to provide a wellhead sealing packing lubricating device to realize the lubrication of the sealing packing, and the installation process is simple, efficient and safe, and the installation and disassembly time does not affect normal production.

[0006] In order to achieve the above object, the utility model adopts the technical scheme as follows: a well mouth sealing packing lubricating device, including casing, sealing cover, lubricating body, the casing includes first casing, second casing, the first casing and second casing are half tubular, the first casing and second casing form tubular casing, the sealing fixing device is solidly arranged at the two sides of the first casing and second casing, and the sealing fixing device is solidly arranged at the two sides of the first casing and second casing.

[0007] The casing is provided with a sealing cover, the sealing cover is provided with a polished rod hole in the center, the lower part of the casing is connected with a well mouth blowout preventer box, the casing is provided with a lubricating body, and the casing, the sealing cover, the well mouth blowout preventer box and the first casing and the second casing are all provided with sealing strips.

[0008] As a limitation of the utility model, the sealing cover is composed of the first sealing cover and the second sealing cover which are axisymmetric, and the polished rod hole is arranged in the center of the sealing cover formed by the first sealing cover and the second sealing cover.

[0009] As a limitation of the utility model, the lubricating body includes the first lubricating body and the second lubricating body which are semicylindrical, the through hole is arranged in the center axis of the cylinder formed by the first lubricating body and the second lubricating body, and the diameter of the through hole is the same as that of the polished rod.

[0010] As a limitation of the utility model, the lubricating body is a cylinder, the through hole is arranged in the center axis of the cylinder in the axial direction, and the vertical notch is arranged in the radial direction, and the diameter of the through hole is the same as that of the polished rod.

[0011] As a limitation of the utility model, the lubricating body is an oil-soaked sponge.

[0012] As a limitation of the utility model, the lubricating body is provided with the transverse limiting rod, the limiting rod is detachably arranged through the casing, and the limiting rod extends out of the surface of the casing.

[0013] As a limitation of the utility model, the limiting rod is two.

[0014] As a limitation of the utility model, the sealing fixing device is the vertical connecting fixed block which is formed by extending radially outward from the casing, the bolt hole is arranged on the connecting fixed block, the first casing and the second casing are connected by the bolt, and the number of the connecting fixed blocks on each side of the casing is at least two.

[0015] As a limitation of the utility model, the material of the casing and the sealing cover is any one of plastic or metal.

[0016] Compared with the prior art, the utility model has the beneficial effects as follows:

[0017] (1) The utility model discloses a first shell, second shell with the half joint structure directly are installed on the blowout preventer and are locked through bolt fixed with the sealing cover, blowout preventer and form the sealed space, and the lubricating body is built-in in the sealed space, adopts the half joint structure, effectively solved the problem of time and energy consumption of installation lubricating device, when installing, do not pump the oil machine and stop pumping, unload the load, improve the security, and one person can install independently, reduce the operation of other people's cooperation, improve the work efficiency;

[0018] (2) The utility model discloses that the shell is filled with lubricating body, and the oil immersion state of lubricating body can continuously provide lubricant for polished rod and sealing packing, solve the problem of short service life of sealing packing.

[0019] In summary, the utility model discloses simple structure, low in manufacturing cost, and when installing and replacing, do not pump the oil machine and stop pumping, unload the load, provide a kind of lubricating device of simple and convenient installation process, high efficiency, safety, applicable to the lubrication of wellhead sealing packing. BRIEF DESCRIPTION OF DRAWINGS

[0020] The utility model will be further explained in detail in combination with the attached drawing and specific embodiment.

[0021] Figure 1 It is the overall structure schematic diagram of the embodiment of the utility model;

[0022] Figure 2 It is the internal structure schematic diagram of the embodiment of the utility model;

[0023] In the drawing: 1-first shell, 2, second shell, 3-first sealing cover, 4-second sealing cover, 5-lubricating body, 6-connection fixed block, 7-bolt hole, 8-polished rod, 9-polished rod hole, 10-limiting rod, PREFERRED EMBODIMENT

[0024] The preferred embodiment of the utility model is described below in combination with the attached drawing. It should be understood that the wellhead sealing packing lubricating device described here is a preferred embodiment, which is only used to illustrate and explain the utility model, and does not constitute a limitation on the utility model.

[0025] The directional terms or positional relationships used in this utility model, such as "up," "down," "left," and "right," are based on the positional relationships in the accompanying drawings of this utility model. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component must have a specific orientation, or that it must be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the content protected by this utility model.

[0026] Example

[0027] This implementation example Figure 1 , Figure 2 The diagram shows a wellhead sealing packing lubrication device, comprising a housing, a sealing cover, and a lubricating body 5. The housing of this lubrication device is tubular, and the tubular housing is installed on the upper part of the wellhead blowout preventer (not shown in the diagram). The housing includes a first housing 1 and a second housing 2, both of which are semi-tubular, forming a tubular housing. Sealing and fixing devices are fixed at the junctions of the first housing 1 and the second housing 3 on both sides. Specifically, in this embodiment, the sealing and fixing device is a vertical connecting and fixing block 6 extending radially outward from the housing. Bolt holes 7 are provided on the connecting and fixing block 6. The first housing 1 and the second housing 2 are connected and fixed by bolts and nuts, thereby fixing the position of the housing. Alternatively, the fixing device can be configured as a locking mechanism to fasten and fix the first housing 1 and the second housing 3. In this embodiment, there are two connecting and fixing blocks 6 on each side of the housing; however, the number can be more than two depending on the height of the housing. Sealing strips (not shown in the diagram) are fixed between the housing and the wellhead blowout preventer, and at the junctions of the first housing 1 and the second housing 2.

[0028] A sealing cover is provided on the top of the housing. The sealing cover has a light rod hole 9 in the center for the light rod 8 to pass through. In order to facilitate the installation of the sealing cover on the light rod 8, the sealing cover is also divided into two parts, namely a first sealing cover 3 and a second sealing cover 4 that are axially symmetrical. The light rod hole 9 is located in the center of the sealing cover formed by the combination of the first sealing cover 3 and the second sealing cover 4. A sealing strip is fixed between the housing and the sealing cover.

[0029] like Figure 2As shown, the lubricating body 5 is arranged in the shell, and the lubricating body 5 surrounds the polished rod 8. In this embodiment, the lubricating body includes a first semi-cylindrical lubricating body and a second semi-cylindrical lubricating body, and the first lubricating body and the second lubricating body are axially provided with a through hole at the center axis of the cylinder formed by the first lubricating body and the second lubricating body, and the polished rod passes through the through hole, and the diameter of the through hole is the same as the diameter of the polished rod. The structure of the lubricating body 5 can also be a cylindrical body, and the lubricating body is arranged on the polished rod through a vertical gap provided at the radial direction of the cylindrical body, and the diameter of the through hole is the same as the diameter of the polished rod. In this embodiment, the lubricating body 5 is preferably an oil-soaked sponge, and the lubricant can be lithium grease or other lubricants. When the polished rod 8 reciprocates up and down, the lubricating body 5 is driven by the polished rod 8 to move up and down and be slightly extruded. The slow extrusion of the lubricating body 5 causes the lubricant to adhere to the polished rod 8, and the lubricant is brought to the sealing filler of the blowout preventer by the polished rod 8 to lubricate the sealing filler. In order to further limit the position of the lubricating body 5 and prevent it from falling out, a transverse limiting rod 10 is arranged above the lubricating body 5, and the limiting rod 10 is detachably arranged through the shell. When the lubricating body 5 needs to be replaced, the sealing cover is opened, the limiting rod 10 is removed, and the lubricating body 5 can be taken out for replacement. In this embodiment, the limiting rod 10 is two, which are arranged on both sides of the polished rod.

[0030] In this embodiment, the shell and the sealing cover do not have special requirements, and only need to meet certain mechanical properties and corrosion resistance. PVC, PE and other plastic materials, or cast iron, carbon steel, stainless steel and other metal materials can be selected.

[0031] When the present embodiment is used, the pumping unit does not need to be stopped. The first shell 1 and the second shell 2 with the same size are arranged on the blowout preventer at the wellhead, the shells are combined and fixed by bolts and nuts, the upper part of the blowout preventer and the shell are sealed by a sealing strip, the lubricating body is arranged in the shell, and the sealing cover is arranged at the upper end of the shell. The polished rod 8 passes through the device. The sealing strips arranged between the shell and the sealing cover, between the shell and the blowout preventer, and between the first shell 1 and the second shell 2 form a sealed space in the shell. When the polished rod 8 reciprocates up and down, the lubricant slowly extruded from the lubricating body 5 is brought into the sealing filler of the blowout preventer to play a lubricating role. The limiting rod 10 is arranged above the lubricating body 5 to limit the position of the lubricating body 5 and prevent it from falling out. During use, the sealing cover can be opened to add lubricant to the lubricating body 5 or directly replace the lubricating body 5. When the lubricating device needs to be replaced, the pumping unit does not need to be stopped and unloaded, and the lubricating device can be directly replaced.

Claims

1. A wellhead seal packing lubricator characterized by: The utility model provides a kind of wellhead lubricating device, including shell, sealing cover, lubricating body, the shell includes first shell, second shell, first shell and second shell are half tubular, first shell and second shell are enclosed to form tubular shell, and sealing fixing device is solidly arranged at the two sides of first shell and second shell enclosed formation; The shell is provided with a sealing cover above, the sealing cover is provided with a polished rod hole in the center, the lower part of the shell is connected with a wellhead blowout preventer box, the shell is provided with a lubricating body, and sealing strips are solidly arranged between the shell and the sealing cover, between the shell and the wellhead blowout preventer box, and at the enclosed formation of the first shell and the second shell.

2. A wellhead packing lubricator as defined in claim 1, characterized in that: The sealing cover is composed of a first sealing cover and a second sealing cover that are axisymmetric, and the polished rod hole is arranged at the center of the sealing cover formed by the combination of the first sealing cover and the second sealing cover.

3. A wellhead packing lubricator as defined in claim 2, characterised in that: The lubricating body includes a first lubricating body in the shape of a semicylinder and a second lubricating body in the shape of a semicylinder, and a through hole is arranged axially at the center axis of the cylinder formed by the enclosed formation of the first lubricating body and the second lubricating body, and the diameter of the through hole is the same as the diameter of the polished rod.

4. A wellhead packing lubricator as defined in claim 2, wherein: The lubricating body is a cylinder, a through hole is arranged axially at the center axis thereof, and a vertical gap is arranged radially, and the diameter of the through hole is the same as the diameter of the polished rod.

5. A wellhead packing lubricator as claimed in any one of claims 1 to 4, characterised in that: The lubricating body is an oil-soaked sponge.

6. A wellhead packing lubricator as defined in claim 5, wherein: A transverse limiting rod is arranged above the lubricating body, the limiting rod is detachably arranged through the shell, and the two ends of the limiting rod extend out of the outer surface of the shell.

7. A wellhead packing lubricator as defined in claim 6 wherein: The limiting rod is two.

8. A wellhead packing lubricator as claimed in any one of claims 1 to 4, 6, 7 wherein: The sealing fixing device is a vertical connecting fixing block extending radially outward from the shell, a bolt hole is arranged on the connecting fixing block, the first shell and the second shell are connected by bolts, and the number of connecting fixing blocks on each side of the shell is at least two.

9. A wellhead packing lubricator as defined in claim 8, wherein: The shell and the sealing cover are made of any one of plastic or metal.

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