CN113123750A - Wellhead sealing device and method for replacing polished rod under pressure - Google Patents
Wellhead sealing device and method for replacing polished rod under pressure Download PDFInfo
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- CN113123750A CN113123750A CN201911419970.4A CN201911419970A CN113123750A CN 113123750 A CN113123750 A CN 113123750A CN 201911419970 A CN201911419970 A CN 201911419970A CN 113123750 A CN113123750 A CN 113123750A
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- 238000007789 sealing Methods 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000012856 packing Methods 0.000 claims abstract description 23
- 230000000712 assembly Effects 0.000 claims abstract description 15
- 238000000429 assembly Methods 0.000 claims abstract description 15
- 230000002265 prevention Effects 0.000 claims abstract description 10
- 238000004891 communication Methods 0.000 claims abstract description 9
- 241000191291 Abies alba Species 0.000 claims abstract description 8
- 239000012530 fluid Substances 0.000 claims abstract description 8
- 230000033001 locomotion Effects 0.000 claims description 12
- 239000003129 oil well Substances 0.000 abstract description 11
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 230000006872 improvement Effects 0.000 abstract description 2
- 238000011084 recovery Methods 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 16
- 238000005086 pumping Methods 0.000 description 8
- 229910000831 Steel Inorganic materials 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 229910001339 C alloy Inorganic materials 0.000 description 3
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- 230000032683 aging Effects 0.000 description 3
- 235000011089 carbon dioxide Nutrition 0.000 description 3
- 230000008014 freezing Effects 0.000 description 3
- 238000007710 freezing Methods 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000010257 thawing Methods 0.000 description 2
- 238000013519 translation Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
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- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/02—Valve arrangements for boreholes or wells in well heads
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention provides a wellhead sealing device and a method for replacing a polish rod under pressure. The wellhead sealing device comprises: the lower part of the operation four-way is communicated with the Christmas tree; the blowout prevention pipe is connected to the upper part of the operation cross, and the sucker rod connected with the polish rod can reciprocate up and down in the blowout prevention pipe; the packing box is arranged at the upper part of the blowout prevention pipe, and the polish rod penetrates through the packing box; the two gate valves are respectively arranged on the left side and the right side of the operation four-way joint, and each gate valve can be switched between an opening state and a closing state; the two gate plate sealer assemblies are communicated with the two gate valves in a one-to-one correspondence mode, and each gate plate sealer assembly comprises a shell and a gate plate movably arranged in the shell; when the gate valve is in an open state, the flashboard can extend into the operation cross and clamp the sucker rod from two sides of the sucker rod, and fluid communication between the upper part and the lower part of the operation cross is cut off. Through this well head sealing device, can reduce the cost that viscous crude thermal recovery well changed the polished rod, rate when providing the production of improvement oil well.
Description
Technical Field
The invention belongs to the field of oilfield development, and particularly relates to a wellhead sealing device and a method for replacing a polish rod under pressure.
Background
The oil pumping machine is a machine for exploiting oil, and is commonly called a head knocking machine. Pumping units are the most prominent lifting devices in sucker-rod pumping systems, which pump oil by reciprocating a piston at the oil reservoir.
The sucker rod is a slender rod of the pumping well, the upper end of the sucker rod is connected with a polished rod, and the lower end of the sucker rod is connected with an oil well pump to play a role in transmitting power. The length of a single sucker rod is 7.62 or 8 meters and 9.14 meters, the material of the sucker rod is generally low carbon alloy steel, the low carbon alloy steel is subjected to quenching and tempering treatment, the low carbon alloy steel is connected with one another by internal threads in an oil pipe and extends to a piston at an underground oil layer, and oil is pumped by reciprocating motion. The length of the current oil well is about two kilometers, for example, a victory oil field, and the deepest oil well is more than three kilometers.
The polish rod of the pumping well is a special sucker rod for realizing the connection between the sucker rod and the rope hanger. Because the sucker rod is positioned at the uppermost part of the sucker rod and the stress is the largest, the diameter of the polish rod is larger than that of the sucker rod, the grade of steel is higher, and the surface is smoother. The main functions are as follows: firstly, the packing box is combined with the packing in the packing box to seal a well mouth and prevent oil, gas and water from leaking; secondly, realizing the connection transition between the sucker rod and the rope hanger; thirdly, completing the indicator diagram test; fourthly, various operations of the wellhead are realized, such as pump bumping, pump hanging adjustment and the like.
The packing box is used for sealing the wellhead dynamic sealing device of the annular space between the oil pipe and the polished rod, and adopts multi-stage sealing and high pressure resistance. The packing box is used for providing sliding seal between the polish rod and the packing box when the polish rod moves up and down along with the power of the oil pumping unit.
In order to fix the polish rod on the top of the polished rod hanger, a polish rod fixing clip is usually installed on the top of the polish rod to complete the connection between the polish rod and the polished rod hanger. The polish rod can break and drop because the polish rod runs up and down under high load for a long time. The polish rod is broken and falls into the well directly, the uppermost part of the packing box on the Christmas tree is exposed out of a pore canal with the diameter of 30mm, crude oil in an oil collecting pipeline is sprayed out along the pore canal, large-area pollution on the oil pumping equipment and the ground around a well site is caused, and the normal production of the oil well is influenced. If the pollution is found out to be untimely, the longer the spraying time is, the greater the pollution is, the greater the treatment difficulty in the later period is, a professional team is required to use various special vehicles for treatment in the treatment process, the treatment time is long, the cost is high, and the environment is damaged greatly.
At present, the thick oil thermal recovery well causes wellhead puncture and production failure due to polished rod eccentric wear and corrosion, and the yield is influenced because an oil well cannot normally pump. In order to recover the normal production of an oil well, a new polished rod needs to be replaced to pump oil, but the oil well is in a high-temperature and high-pressure environment, the polished rod is replaced by temporarily blocking the underground pressure in dry ice freezing operation at present, but the process has extremely high operation cost and has blowout risk caused by defrosting in the operation process.
Accordingly, there is a need for a wellhead sealing device that can conveniently and sealingly replace a polished rod.
Disclosure of Invention
The invention mainly aims to provide a wellhead sealing device and a method for replacing a polished rod under pressure, and aims to solve the problems that in the prior art, the operation cost is high due to dry ice freezing and blowout risks caused by defrosting in the operation process exist.
To achieve the above object, according to one aspect of the present invention, there is provided a wellhead sealing device, including: the lower part of the operation four-way is communicated with the Christmas tree; the blowout prevention pipe is connected to the upper part of the operation cross, and the sucker rod connected with the polish rod can reciprocate up and down in the blowout prevention pipe; the packing box is arranged at the upper part of the blowout prevention pipe, and the polish rod penetrates through the packing box; the two gate valves are respectively arranged on the left side and the right side of the operation four-way joint and can be switched between an opening state and a closing state; the gate plate sealer assemblies are communicated with the two gate valves in a one-to-one correspondence mode, and each gate plate sealer assembly comprises an outer shell and a gate plate movably arranged in the outer shell; and when the gate valve is in the open state, the flashboards of the two flashboard sealer assemblies can extend into the operation cross joint and clamp the sucker rod from two sides of the sucker rod, and the fluid communication between the upper part and the lower part of the operation cross joint is cut off.
Further, the lower portion of the working cross is in communication with the cross of the Christmas tree.
Further, the packing box is a tower packing box.
Further, the ram sealer assembly controls movement of the rams through rotational movement of a ram shaft.
Further, the ram sealer assembly includes a shaft seal secured within the housing by an interference fit, the ram shaft passes through the shaft seal, and the shaft seal enables an axial seal around the ram shaft.
Further, the ram sealer assembly is removably connected to the gate valve.
Further, the wellhead sealing device further comprises an external control device, and the external control device drives the gate valve to switch between the opening state and the closing state.
Further, the external control device is a hand wheel.
Further, hand wheel detachably sets up on the gate valve, the hand wheel can control the flashboard of flashboard sealer assembly removes.
By applying the technical scheme of the invention, the wellhead sealing device comprises two gate valves and two gate plate sealer assemblies. When the gate valve is in an open state, the flashboards of the two flashboard sealer assemblies can extend into the operation cross and clamp the sucker rod from two sides of the sucker rod, and fluid communication between the upper part and the lower part of the operation cross is cut off. At this time, the operation of replacing the polish rod can be performed. The technical scheme of the application has a compact structure, can change equipment connected on the operation cross according to needs, and has strong adaptability; because the operation cross can be pressed to conveniently replace the polish rod, the production cost is effectively saved, and the production efficiency of the oil well is improved; by using the operation four-way joint, the installation is convenient, and other operations are not influenced; the problem that the rubber core of the gate plate is not aging-resistant when being in a high-temperature environment for a long time is solved by isolating the gate plate from a pressurizing environment during non-operation; and the operation four-way structure is safe and convenient to use and simple to operate, and the purpose of replacing the polish rod under pressure quickly and safely is achieved.
According to another aspect of the present invention, there is provided a method of replacing a polish rod under pressure using the wellhead sealing device described above, the method comprising the steps of: under the closing state of the gate valve, connecting the two gate plate sealer assemblies with the two gate valves correspondingly; switching the gate valve from the closed state to an open state; actuating the rams of both of the ram sealer assemblies to move to grip the sucker rod and to cut off fluid communication between the upper and lower portions of the service cross; replacing the polish rod in the lubricator; withdrawing the gate plate and switching the gate valve from an open state to a closed state; and removing the ram sealer assembly from the gate valve.
By applying the technical scheme of the invention, the gate plate can be withdrawn and separated from a high-temperature and high-pressure working environment in the closed state of the gate valve, so that the problem that the rubber core of the gate plate is not aging-resistant in the high-temperature environment for a long time is solved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 shows a schematic block diagram of an embodiment of a wellhead sealing device according to the present invention.
Wherein the figures include the following reference numerals:
1. a polish rod; 2. a sucker rod; 3. the operation four-way joint; 4. a packing box; 5. a lubricator; 6. a shutter plate; 7. a gate valve; 8. a ram shaft; 9. a shaft seal; 10. a ram sealer assembly.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Referring to fig. 1, the wellhead sealing device of the present embodiment includes: the operation four-way joint 3 is characterized in that the lower part of the operation four-way joint 3 is communicated with a Christmas tree; the lubricator 5 is connected to the upper part of the operation cross 3, and the sucker rod 2 connected with the polish rod 1 can reciprocate up and down in the lubricator 5; the packing box 4 is arranged at the upper part of the blowout prevention pipe 5, and the polish rod 1 penetrates through the packing box 4; the two gate valves 7 are respectively arranged on the left side and the right side of the operation four-way joint 3, and each gate valve 7 can be switched between an opening state and a closing state; the two gate plate sealer assemblies 10 are communicated with the two gate valves 7 in a one-to-one correspondence mode, and each gate plate sealer assembly 10 comprises a shell and a gate plate 6 movably arranged in the shell; wherein, the gate valve 7 is in an open state, the gate plates 6 of the two gate plate sealer assemblies 10 can extend into the operation cross 3 and clamp the sucker rod 2 from two sides of the sucker rod 2, and the fluid communication between the upper part and the lower part of the operation cross 3 is cut off. When the wellhead sealing device is used, the polish rod 1 and the sucker rod 2 coupling are lifted into the blowout prevention pipe 5 when the polish rod is replaced, an operation space is provided for replacing the polish rod 1, after the polish rod 1 and the sucker rod 2 coupling are completely lifted into the blowout prevention pipe 5, the shaft of the flashboard sealer assembly 10 is rotated, the flashboard 6 is pushed to clamp the sucker rod 2 to implement static sealing, the underground pressure is sealed, and therefore polish rod replacement operation with pressure is implemented.
Preferably, the lower part of the working cross 3 communicates with the cross of the christmas tree.
Therefore, the wellhead sealing device can be widely applied to oil pumping units.
Preferably, the packing box 4 is a tower packing box.
This tower packing box can provide good shaft seal effect for the polished rod.
Advantageously, the ram sealer assembly 10 controls movement of the rams 6 through rotational movement of the ram shaft 8.
The ram shaft 8 is threaded and threadedly coupled to the housing of the ram sealer assembly 10 so that the movement of the rams 6 is controlled by the rotational movement of the ram shaft 8, the translational movement of the rams can be precisely adjusted, and the clamping of the sucker rod 2 to effect a static seal can be made more reliable. One end of the ram shaft 8 protrudes out of the housing of the ram sealer assembly 10, and can be engaged with a tool such as a hand wheel so that the ram shaft 8 can travel in the axial direction of the ram sealer assembly 10.
Advantageously, the ram sealer assembly 10 comprises a shaft seal 9 fixed within the housing by interference fit, the shaft seal 9 passing through the ram shaft 8, and the shaft seal 9 enabling axial sealing around the ram shaft 8.
The axial sealing around the flashboard shaft 8 is realized through the shaft sealing piece 9, so that the oil well using the wellhead sealing device can be prevented from keeping sealing when the polished rod 1 device is replaced, and well blowout is avoided.
Advantageously, the ram sealer assembly 10 is removably attached to the gate valve 7.
Thus, maintenance and replacement of the ram sealer assembly 10 is facilitated.
Advantageously, the wellhead sealing device further comprises an external control device which drives the switching of the gate valve 7 between the open state and the closed state.
Advantageously, the external control device is a hand wheel.
Through outside hand wheel, can control flashboard 6 of flashboard sealer assembly 10 accurately to the stable translation of control flashboard 6 guarantees that shaft seal 9 can not destroy sealed because of the unstable translation of flashboard 6.
Advantageously, a hand wheel is removably provided on the gate valve 7, the hand wheel being able to control the movement of the shutter 6 of the shutter-sealer assembly 10.
Therefore, only one hand wheel is used for controlling the gate valve 7 and the gate plate sealer assembly 10, and resources and parts are saved. In addition, when the hand wheel is removed to operate the disc sealer assembly 10 in a state where the gate valve 7 is already closed, it is possible to prevent the gate valve 7 from being opened by mistake when the disc sealer assembly 10 is operated.
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects: the wellhead sealing device with the operation cross joint is compact in structure, equipment connected with the operation cross joint can be changed according to needs, and adaptability is high; because the operation cross can be pressed to conveniently replace the polish rod, the production cost is effectively saved, and the production efficiency of the oil well is improved; by using the operation four-way joint, the installation is convenient, and other operations are not influenced; the problem that the rubber core of the gate plate is not aging-resistant when being in a high-temperature environment for a long time is solved by isolating the gate plate from a pressurizing environment during non-operation; and the operation four-way structure is safe and convenient to use and simple to operate, and the purpose of replacing the polish rod under pressure quickly and safely is achieved.
According to another aspect of the present invention, there is provided a method of replacing a polish rod under pressure using the wellhead sealing device described above, the method comprising the steps of: in the closed state of the gate valve 7, the two gate plate sealer assemblies 10 are correspondingly connected with the two gate valves 7; switching the gate valve 7 from a closed state to an open state; drives the rams 6 of the two ram sealer assemblies 10 to move to grip the sucker rod 2 and cut off fluid communication between the upper and lower portions of the service cross 3; replacing the polish rod 1 in the lubricator 5; withdrawing the gate plate 6 and switching the gate valve 7 from the open state to the closed state; and removing the ram sealer assembly 10 from the gate valve 7.
From the above description, it can be seen that the above-mentioned embodiments of the method for replacing a polished rod under pressure according to the present invention achieve the following technical effects: by adopting the method, the polished rod can be replaced under pressure, so that the operation cost can be reduced by more than 90%; and the core of the flashboard does not need to work and is isolated from high temperature and high pressure during normal production, so that the core is not aged due to long-term high temperature environment, the safety and reliability of polished rod replacement under pressure are improved, and the blowout risk of polished rod replacement implemented by temporarily blocking the underground pressure during dry ice freezing operation is avoided.
In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A wellhead sealing device, comprising:
the lower part of the operation four-way joint (3) is communicated with the Christmas tree;
the lubricator (5) is connected to the upper part of the operation cross (3), and the sucker rod (2) connected with the polish rod (1) can reciprocate up and down in the lubricator (5);
the packing box (4) is installed on the upper portion of the blowout prevention pipe (5), and the polished rod (1) penetrates through the packing box (4);
the two gate valves (7) are respectively arranged on the left side and the right side of the operation four-way joint (3), and each gate valve (7) can be switched between an opening state and a closing state; and
two gate plate sealer assemblies (10) in one-to-one correspondence with the two gate valves (7), each gate plate sealer assembly (10) comprising a housing and a gate plate (6) movably disposed within the housing;
wherein, the gate valve (7) is in the open state, the flashboards (6) of the two flashboard sealer assemblies (10) can extend into the operation cross joint (3) and clamp the sucker rod (2) from two sides of the sucker rod (2), and the fluid communication between the upper part and the lower part of the operation cross joint (3) is cut off.
2. A wellhead sealing device according to claim 1, characterized in that the lower part of the working cross (3) communicates with the cross of the christmas tree.
3. A wellhead sealing arrangement according to claim 1, characterised in that the packing box (4) is a tower packing box.
4. A wellhead sealing device according to claim 1, characterised in that the ram sealer assembly (10) controls movement of the rams (6) by rotational movement of a ram shaft (8).
5. A wellhead sealing arrangement according to claim 4, characterised in that the ram sealer assembly (10) comprises a shaft seal (9) secured within the housing by an interference fit, the ram shaft (8) passing through the shaft seal (9), and the shaft seal (9) enabling axial sealing around the ram shaft (8).
6. A wellhead sealing device according to claim 1, characterised in that the ram sealer assembly (10) is removably connected to the gate valve (7).
7. A wellhead sealing device according to claim 1, characterized in that it also comprises an external control device which drives the switching of the gate valve (7) between the open and closed conditions.
8. A wellhead sealing device according to claim 7, characterised in that the external control device is a hand wheel.
9. A wellhead sealing device according to claim 8, characterised in that the hand wheel is detachably arranged on the gate valve (7) and can control the movement of the rams (6) of the ram sealer assembly (10).
10. A method of replacing a polish rod under pressure, using the wellhead sealing device of any one of claims 1 to 9, the method comprising the steps of:
in the closed state of the gate valve (7), connecting two gate plate sealer assemblies (10) with the two gate valves (7) correspondingly;
switching the gate valve (7) from the closed state to an open state;
-actuating the shutters (6) of the two shutter-sealer assemblies (10) to move to grip the sucker rod (2) and cut off the fluid communication between the upper and lower parts of the service cross (3);
replacing the polish rod (1) in the lubricator (5);
withdrawing the shutter plate (6) and switching the gate valve (7) from an open state to the closed state; and
removing the ram sealer assembly (10) from the gate valve (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911419970.4A CN113123750A (en) | 2019-12-31 | 2019-12-31 | Wellhead sealing device and method for replacing polished rod under pressure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911419970.4A CN113123750A (en) | 2019-12-31 | 2019-12-31 | Wellhead sealing device and method for replacing polished rod under pressure |
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| Publication Number | Publication Date |
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| CN113123750A true CN113123750A (en) | 2021-07-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911419970.4A Pending CN113123750A (en) | 2019-12-31 | 2019-12-31 | Wellhead sealing device and method for replacing polished rod under pressure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113503138A (en) * | 2021-09-07 | 2021-10-15 | 东营市海天石油科技有限责任公司 | Polished rod replacing device with pressure |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201321830Y (en) * | 2008-12-21 | 2009-10-07 | 大庆油田有限责任公司 | Split lubricator for closed fishing and polish rod changing without killing well |
| CN202081851U (en) * | 2010-07-28 | 2011-12-21 | 毕友军 | Polish rod sealing apparatus |
| CN204457555U (en) * | 2014-12-08 | 2015-07-08 | 中国石油天然气股份有限公司 | Piston rod sealer for pumping oil |
| CN104963634A (en) * | 2015-07-02 | 2015-10-07 | 中国石油天然气股份有限公司 | Sucker rod tripping method |
| US20180030802A1 (en) * | 2015-02-13 | 2018-02-01 | Schlumberger Technology Corporation | Deployment blow out preventer with interlock |
| US20190017342A1 (en) * | 2016-01-08 | 2019-01-17 | Licheng Yu | Wellhead sealing device of sucker-rod pumping machine |
| CN209067150U (en) * | 2018-10-11 | 2019-07-05 | 中国石油天然气股份有限公司 | Packing protective device and packing box |
| CN211851756U (en) * | 2019-12-31 | 2020-11-03 | 中国石油天然气股份有限公司 | Well head sealing device |
-
2019
- 2019-12-31 CN CN201911419970.4A patent/CN113123750A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201321830Y (en) * | 2008-12-21 | 2009-10-07 | 大庆油田有限责任公司 | Split lubricator for closed fishing and polish rod changing without killing well |
| CN202081851U (en) * | 2010-07-28 | 2011-12-21 | 毕友军 | Polish rod sealing apparatus |
| CN204457555U (en) * | 2014-12-08 | 2015-07-08 | 中国石油天然气股份有限公司 | Piston rod sealer for pumping oil |
| US20180030802A1 (en) * | 2015-02-13 | 2018-02-01 | Schlumberger Technology Corporation | Deployment blow out preventer with interlock |
| CN104963634A (en) * | 2015-07-02 | 2015-10-07 | 中国石油天然气股份有限公司 | Sucker rod tripping method |
| US20190017342A1 (en) * | 2016-01-08 | 2019-01-17 | Licheng Yu | Wellhead sealing device of sucker-rod pumping machine |
| CN209067150U (en) * | 2018-10-11 | 2019-07-05 | 中国石油天然气股份有限公司 | Packing protective device and packing box |
| CN211851756U (en) * | 2019-12-31 | 2020-11-03 | 中国石油天然气股份有限公司 | Well head sealing device |
Non-Patent Citations (1)
| Title |
|---|
| 邱福寿: "稠油热采光杆带压作业技术研究及应用", 新疆石油科技, pages 498 - 501 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113503138A (en) * | 2021-09-07 | 2021-10-15 | 东营市海天石油科技有限责任公司 | Polished rod replacing device with pressure |
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