CN219953288U - Wellhead sealing device for underground operation - Google Patents
Wellhead sealing device for underground operation Download PDFInfo
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- CN219953288U CN219953288U CN202320321166.8U CN202320321166U CN219953288U CN 219953288 U CN219953288 U CN 219953288U CN 202320321166 U CN202320321166 U CN 202320321166U CN 219953288 U CN219953288 U CN 219953288U
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- 238000007789 sealing Methods 0.000 title claims abstract description 216
- 210000002445 nipple Anatomy 0.000 claims description 21
- 230000000670 limiting effect Effects 0.000 claims description 14
- 210000004907 gland Anatomy 0.000 claims description 6
- 238000012360 testing method Methods 0.000 abstract description 51
- 238000000034 method Methods 0.000 abstract description 17
- 230000008569 process Effects 0.000 abstract description 15
- 230000008439 repair process Effects 0.000 abstract description 10
- 239000010985 leather Substances 0.000 description 18
- 238000010276 construction Methods 0.000 description 15
- 238000004519 manufacturing process Methods 0.000 description 8
- 239000002184 metal Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 239000003129 oil well Substances 0.000 description 4
- 230000002411 adverse Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 239000003208 petroleum Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
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Abstract
The utility model relates to a wellhead sealing device for underground operation, which is provided with a sealing element, wherein the upper part of a pressure-bearing short section is provided with a connecting cavity, the part of the pressure-bearing short section, which is provided with the connecting cavity, can be located above a large four-way sealing body, and the lower part of the pressure-bearing short section can be inserted into the large four-way sealing body; the sealing element comprises a large four-way sealing element and a sealing body sealing element, the large four-way sealing element is arranged outside the large four-way sealing body, and the sealing body sealing element is arranged between the large four-way sealing body and the pressure-bearing short joint; the large four-way seal body can be installed in a wellhead large four-way of an operation well. The device can realize reliable sealing of the wellhead of the operation well, can fix the underground test tubular column or the well repair tubular column, prevent the underground operation tubular column from shaking in the process of oil test operation and well repair operation, and can ensure the wellhead safety during lifting and lowering the underground tubular column in the process of high-pressure test and well repair operation.
Description
Technical Field
The utility model relates to an auxiliary tool for petroleum industry well repair operation and oil test operation, in particular to a wellhead sealing device for underground operation.
Background
In the process of testing oil and gas in a exploratory well which is explored and developed in petroleum industry, the well is generally called as a test oil well, and in particular, in a test tube string formed by connecting test tube columns in the test process of testing oil and gas, the bottom of the test tube string is generally connected with a packer and a test tool for sealing the annular space of a casing of an oil layer.
The method of using the packer connected in the test tube string is typically to lower the tubing string to seat and raise the tubing string to unseal; the connected testing tool also needs to lift and lower the pipe string in the process of opening and closing the pipe string in the underground, but the stroke of lifting and closing the testing tool through the pipe string is smaller than the stroke of lifting the pipe string when the packer is unpacked.
Due to the influence of factors such as gravity in the well, buoyancy, inclination of a shaft, well path, stretching amount of a pipe column and the like, unexpected deblocking of the packer is often caused in the opening and closing process of a downhole testing tool. After the packer is accidentally unsealed, oil gas can be caused to return to a wellhead, impact is generated on a blowout preventer installed at the wellhead, and even the consequences of puncturing a blowout preventer ram and a rubber core, causing the top of a test tubular column and the like can occur, so that great potential safety hazards are brought. After the situation occurs, the post-treatment is complex, time and labor are wasted, and the production cost is greatly increased.
Besides the above conditions, if the packer rubber is not sealed with the oil layer casing, the thread of the test pipe column is not tightly sealed, and the like, oil gas in the well can be returned to the wellhead, various adverse effects are caused, the construction time is prolonged, and the production cost is increased.
In the workover process of the petroleum industry, if the connecting screw thread in the underground operation pipe column is not sealed and the packer rubber in the operation pipe column is unsealed accidentally, the problems of damage to a wellhead device, oil gas return and the like caused by the fact that oil gas returns to the wellhead can also occur.
It is therefore desirable to invent a wellhead sealing device for use in downhole operations that addresses the above-described problems.
To solve the problem of sealing the wellhead, the following related patent technologies have emerged:
1. the shale gas well oil pipe hanger and the shale gas production system comprising the same disclosed by the CN201621377066.3 can prevent wellhead gas leakage caused by damage of a metal sealing ring. The shale gas well oil pipe hanger comprises a hanger body and a metal sealing assembly, wherein a limiting ring groove is formed in the outer circumference of the hanger body along the axial direction, the hanger bodies at the two ends of the limiting ring groove have the same maximum outer circumference diameter, and an upper combined sealing ring and a lower combined sealing ring are correspondingly arranged on the maximum outer circumferences of the hanger bodies at the upper end and the lower end of the limiting ring groove. The shale gas production system comprises a tubing head four-way joint, a flat valve and a production tree, wherein the upper end and the lower end of a hanger body are correspondingly matched with the inner wall surfaces of the flat valve and the tubing head four-way joint respectively through an upper combined sealing ring and a lower combined sealing ring, and a metal sealing ring on the connecting end surface between the tubing head four-way joint and the flat valve is opposite to a limiting ring groove; the metal seal assembly is in seal fit on the reverse conical inner wall surface of the tubing head four-way joint.
However, the above-described apparatus cannot be used for wellhead sealing during oil well testing and workover operations.
2. Patent number: CN201610581395.8 discloses a hanger with metal pair seal, said utility model belongs to the equipment for lifting oil pipe in the technical field of oil-gas drilling equipment, and its purpose is to provide a hanger with metal pair seal and lifting oil pipe equipment with hanger with high sealing property and long service life. The four-way sealing device comprises a large four-way sealing body, a main sealing component which is sealed by metal is arranged between a shaft shoulder of the large four-way sealing body and a lower casing head, an auxiliary sealing component which is sealed by metal is arranged between the top of the large four-way sealing body and an upper casing head, and a standard sealing backing ring is arranged between the upper casing head and the lower casing head.
Said utility model is applicable to hanger and oil lifting and discharging equipment using said hanger, but said device can not be used for wellhead sealing in the course of oil testing operation and well repairing operation of oil well.
3. Patent number: the utility model discloses a dust cover special for a liner hanger and a dust device special for the liner hanger, which relate to the technical field of cementing tools and comprise a centralizing ring and a sealing ring positioned below the centralizing ring, wherein the centralizing ring and the sealing ring are fixedly connected through fasteners, upper through flow holes which are vertically communicated are distributed in the centralizing ring along the circumference, lower through flow holes which are vertically communicated with the upper flow holes are arranged in the sealing ring, and a filter screen is fixedly arranged between the upper flow holes and the lower flow holes.
Said utility model is reasonable and compact in structure, convenient for use, and is mounted in the annular gap between the tieback cylinder of tail pipe hanger and centre rod, so that it can effectively filter large-grain impurity in the circulating drilling fluid, and can ensure cleaning and effectiveness of releasing mechanism; meanwhile, the inside of the device is provided with the upper and lower communicating overflow holes, so that the liquid in the annular cavity of the tail pipe hanger is kept to circulate, the pressure difference between the inside and the outside of the tieback cylinder is guaranteed to be zero, the tieback cylinder is prevented from being compressed and deformed by high pressure in the well, and the device has the characteristics of safety, labor saving, simplicity and high efficiency. However, the above-described apparatus cannot be used for wellhead sealing during oil well testing and workover operations.
Disclosure of Invention
In order to prevent the unexpected deblocking of a packer connected to a test string and a workover string in a well, unsealing between a packer rubber and an oil layer casing, and adverse consequences caused by upward return of oil gas in the well to a wellhead due to unsealing of connecting threads in the test string and the workover string, the utility model provides a wellhead sealing device for downhole operation, which can realize wellhead sealing and prevent upward return of oil gas when a movable string is needed in the middle of downhole operation, protect well control equipment and facilities of the wellhead, ensure the safety of downhole construction operation, improve construction efficiency and reduce production cost.
The technical scheme of the utility model is as follows: a wellhead sealing device for downhole operations is provided with a seal, wherein: the upper part of the pressure-bearing short section is provided with a connecting cavity, the part provided with the connecting cavity in the pressure-bearing short section can be located on the large four-way sealing body, and the lower part of the pressure-bearing short section can be inserted into the large four-way sealing body;
the sealing element comprises a large four-way sealing element and a sealing body sealing element, the large four-way sealing element is arranged outside the large four-way sealing body, and the sealing body sealing element is arranged between the large four-way sealing body and the pressure-bearing short joint; the large four-way seal body can be installed in a wellhead large four-way of an operation well.
Preferably, the connecting cavity can be connected with an oil pipe single pipe or an oil pipe short joint, and the lower part of the pressure-bearing short joint can be connected with a downhole operation pipe column; the internal thread in the connecting cavity and the external thread at the lower part of the pressure-bearing pup joint are oil pipe threads.
Preferably, the lower end face of the outer wall of the connecting cavity is provided with an annular boss; the sealing body sealing piece is arranged on the outer wall of the pressure-bearing pup joint below the connecting cavity, and the sealing body sealing piece on the outer wall of the pressure-bearing pup joint is arranged for more than six times.
Preferably, an annular groove corresponding to the annular boss of the lower end face of the outer wall of the connecting cavity is formed in the outer side of the central hole of the upper end face of the large four-way sealing body, and the annular boss of the lower end face of the connecting cavity is arranged in the annular groove of the upper end face of the large four-way sealing body.
Preferably, the upper and lower ends of the large four-way sealing body are respectively provided with a chamfer, the outer diameter of the large four-way sealing body is consistent with the inner diameter of the large four-way of the wellhead, and the height of the large four-way sealing body is consistent with the height above the limit table in the inner cavity of the large four-way of the wellhead.
Preferably, the large four-way sealing piece arranged on the outer wall of the large four-way sealing body is provided with at least two channels.
Preferably, the lower end face of the outer side of the central hole of the large four-way sealing body is also provided with a sealing leather cup mounting groove, a sealing leather cup is arranged in the sealing leather cup mounting groove, and the sealing leather cup arranged in the sealing leather cup mounting groove is fixed through a gland and a fixing screw.
Preferably, the outer diameter of the pressure-bearing nipple is smaller than the aperture of the central hole of the wellhead large four-way inner cavity limiting table, the outer diameter of the sealing leather cup in a free state is smaller than the outer diameter of the large four-way sealing body, and the sealing leather cup can penetrate from the central hole of the wellhead large four-way limiting table to the lower side of the wellhead large four-way limiting table.
Preferably, a hanging ring is arranged on the upper end face of the large four-way sealing body and on the outer side of the connecting cavity.
Preferably, the length of the pressure-bearing nipple below the connecting cavity is larger than the sum of the length required by the setting stroke of the packer connected in the underground operation tubular column and the height of the large four-way sealing body.
Compared with the existing construction mode, the utility model has the following remarkable effects:
the device can realize reliable sealing of the wellhead of the operation well, can fix the underground test tubular column or the well repair tubular column, prevent the underground operation tubular column from shaking in the process of oil test operation and well repair operation, and can ensure the wellhead safety during lifting and lowering the underground tubular column in the process of high-pressure test and well repair operation. The specific expression is as follows:
1. when the device is used for oil testing operation and well repairing operation, the large four-way sealing body, the large four-way sealing piece, the pressure-bearing short joint and the sealing body sealing piece can realize the sealing of the well mouth of an operation well, and the pressure-bearing short joint and the sealing body sealing piece can bear pressure to meet the requirement of high-pressure construction, so that the blowout prevention flashboard in the original blowout preventer stack can not bear construction pressure. The problems that oil gas in the well returns to the wellhead due to reasons such as unexpected deblocking of a packer connected in a well test pipe column and a well repair operation pipe column, unsealing of a packer rubber cylinder and an oil layer casing, unsealing of connecting threads in a well operation pipe column and the like are solved.
2. The device can also realize wellhead sealing through the device when a movable underground operation pipe column is needed in the middle of high-pressure test and well repairing operation, such as lifting and lowering a test pipe column, a test oil pipe column or a well repairing operation pipe column, prevent oil gas from continuously ascending, protect well control equipment and facilities of an operation well, avoid the top of the underground operation pipe column, realize wellhead sealing effect when the underground pipe column is movable in the high-pressure test process and the well repairing operation process, and avoid the phenomenon of oil gas on the movable underground pipe column caused by the underground operation construction process such as the phenomenon of oil gas returning to a blowout preventer flashboard.
3. After the device is used, the current construction process of the current oil testing operation is convenient, for example, when the packer connected in the original underground test pipe column is accidentally unsealed, the current situation that the packer is set again only by closing the test tool connected in the test pipe column is needed. After the device is used, the test pipe column can be moved under the condition of high pressure in the well to set the packer connected with the test pipe column.
4. In the well repair operation process, if the packer in the underground operation pipe column is accidentally unsealed, the device can realize the setting of the packer in the underground operation pipe column by lifting and lowering the pipe column while preventing the well liquid from returning upwards.
5. The wellhead sealing device for the oil testing construction well and the well repairing construction well can obviously improve the construction speed and the construction quality, simultaneously reduce the labor intensity of workers, obviously reduce the production cost and have obvious use effect and application value.
Drawings
The accompanying drawings are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate the utility model and together with the embodiments of the utility model, serve to explain the utility model. In the drawings:
fig. 1 is a schematic structural view of the present utility model.
In the figure: the device comprises a connecting cavity 1, a lifting ring 2, a large four-way sealing body 3, a large four-way sealing piece 4, a sealing leather cup 5, a sealing body sealing piece 6, a pressure-bearing short joint 7, a gland 8 and a fixing screw 9.
Detailed Description
The drawings are for reference and illustration purposes only and are not intended to limit the scope of the present utility model. The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. It will be apparent that the described embodiments are only some, but not all, embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
In the description of the present utility model, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present utility model and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model. Furthermore, in the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
Referring to fig. 1, a wellhead sealing device for downhole operations is provided with a seal, wherein:
the upper part of the pressure-bearing nipple 7 is provided with a connecting cavity 1, the part of the pressure-bearing nipple 7 provided with the connecting cavity 1 can be located above the large four-way sealing body 3, and the lower part of the pressure-bearing nipple 7 can be inserted into the large four-way sealing body 3;
the sealing element comprises a large four-way sealing element 4 and a sealing body sealing element 6, wherein the large four-way sealing element 4 is arranged outside the large four-way sealing body 3, and the sealing body sealing element 6 is arranged between the large four-way sealing body 3 and the pressure-bearing short joint 7;
the large four-way sealing body 3 can be installed in a wellhead large four-way of an operation well.
The utility model is arranged in a large four-way joint at the wellhead of an operation well, the large four-way sealing element 4 in the large four-way sealing body 3 can realize the sealing between the device and the large four-way joint at the wellhead, the sealing body sealing element 6 arranged between the pressure-bearing nipple 7 and the large four-way sealing body 3 can realize the sealing between the pressure-bearing nipple 7 and the large four-way sealing body 3, and the sealing of the wellhead of the operation well is ensured, and the operation well comprises an oil testing operation well and a well repairing operation well.
When the device is installed in a wellhead large four-way joint during oil testing operation and well repairing operation, the device is connected with a downhole operation pipe column through a pressure-bearing short section 7, so that the problems that in-well oil gas returns to the wellhead due to unsealing of a packer connected in an in-well test pipe column and a well repairing operation pipe column and unsealing of a packer rubber cylinder and an oil layer casing pipe, unsealing of threads in the test pipe column and the well repairing operation pipe column and the like can be effectively prevented, and various defects caused by the problems and economic losses caused by the defects are avoided.
When the underground operation pipe column is needed to be moved in the middle of a high-pressure test or in the middle of well repair operation, the underground operation pipe column is lifted or lowered through the pressure-bearing short joint 7 connected to the upper end of the underground operation pipe column, and the sealing body sealing piece 6 is arranged between the pressure-bearing short joint 7 and the large four-way sealing body 3, so that wellhead sealing during lifting and lowering of the underground operation pipe column can be realized, oil gas can be effectively prevented from returning upwards, well control equipment and facilities of a wellhead are protected, such as flashboard in a blowout preventer stack is prevented from being damaged, the safety of underground construction operation is ensured, and the production cost is reduced.
On the basis of the first embodiment, the present utility model also has the following embodiments:
one preferred embodiment is: the connecting cavity 1 can be connected with an oil pipe single or an oil pipe short joint, and the lower part of the pressure-bearing short joint 7 can be connected with a downhole operation pipe column; the internal thread in the connecting cavity 1 and the external thread at the lower part of the pressure-bearing pup joint 7 are both oil pipe threads. The upper part of the device can be connected with wellhead testing equipment or a blowout pipeline through a single oil pipe or a short oil pipe connected in the connecting cavity 1.
One preferred embodiment is: the lower end face of the outer wall of the connecting cavity 1 is provided with an annular boss; the sealing body sealing piece 6 is arranged on the outer wall of the pressure-bearing nipple 7 below the connecting cavity 1, and the sealing body sealing piece 6 on the outer wall of the pressure-bearing nipple 7 is arranged for more than six times.
One preferred embodiment is: the outer side of the central hole of the upper end face of the large four-way sealing body 3 is provided with an annular groove corresponding to the annular boss of the lower end face of the outer wall of the connecting cavity 1, and the annular boss of the lower end face of the connecting cavity 1 is seated in the annular groove of the upper end face of the large four-way sealing body 3. The whole suspended weight of the underground operation pipe column can be pressed and seated on the large four-way sealing body 3 by the aid of the connecting cavity 1 at the upper part of the pressure-bearing short section 7, the underground operation pipe column is fixed, and adverse effects on sealing caused by shaking of the underground operation pipe column when oil testing operation and well repairing operation are carried out in a high-pressure state in a well are prevented.
One preferred embodiment is: the upper and lower both ends of big cross seal body 3 all are equipped with the chamfer, and the external diameter of big cross seal body 3 accords with the internal diameter of the big cross of well head, and the height of big cross seal body 3 accords with the height above the limit table in the big cross inner chamber of well head.
One preferred embodiment is: the large four-way sealing piece 4 arranged on the outer wall of the large four-way sealing body 3 is provided with at least two channels. The large four-way sealing piece 4 can enable the outer surface of the large four-way sealing body 3 and the inner surface of the wellhead large four-way to form sealing, and the pressure bearing of the large four-way sealing piece 4 can meet the requirement of high-pressure construction.
One preferred embodiment is: the lower end face of the outer side of the central hole of the large four-way sealing body 3 is also provided with a sealing leather cup mounting groove, a sealing leather cup 5 is arranged in the sealing leather cup mounting groove, and the sealing leather cup 5 arranged in the sealing leather cup mounting groove is fixed through a gland 8 and a fixing screw 9. The sealing leather cup 5 is fixed on the lower end face of the large four-way sealing body 3 through the gland 8 and the fixing screw 9, and once the sealing leather cup 5 is damaged, the gland 8 can be replaced after being disassembled.
One preferred embodiment is: the external diameter of the pressure-bearing nipple 7 is smaller than the aperture of the central hole of the wellhead large four-way inner cavity limiting table, the external diameter of the sealing leather cup 5 in a free state is smaller than the external diameter of the large four-way sealing body 3, and the sealing leather cup 5 can penetrate from the central hole of the wellhead large four-way limiting table to the lower side of the wellhead large four-way limiting table. The sealing of the wellhead sealing device and the tripping operation of the underground operation pipe column can be smoothly completed through the pressure-bearing short joint 7. When pressure exists in the underground oil sleeve annulus, under the action of high pressure, the sealing leather cup 5 expands outwards and clings to the bottom of the large four-way sealing body 3, bears partial high pressure, plays a role in protecting the large four-way sealing piece 4, and can provide auxiliary sealing for sealing between the large four-way sealing body 3 and a wellhead large four-way.
One preferred embodiment is: and a hanging ring 2 is arranged on the upper end face of the large four-way sealing body 3 and outside the connecting cavity 1. The large four-way sealing body 3 can be conveniently hoisted integrally, and when the sealing body sealing piece 6 and the large four-way sealing piece 4 need to be replaced, the large four-way sealing body 3 can be lifted out of the large four-way at the wellhead. At this time, the pressure-bearing nipple 7 connected with the underground operation pipe column can be lifted from the large four-way sealing body 3 to the upper part of the wellhead large four-way, and the large four-way sealing body 3 can be lifted from the wellhead large four-way under the condition that the pressure-bearing nipple 7 is not separated from the underground operation pipe column because the sealing body sealing piece 6 is separated from the inner cavity of the large four-way sealing body 3. And the sealing body sealing piece 6 outside the pressure-bearing nipple 7 and the large four-way sealing piece 4 outside the large four-way sealing body 3 are replaced.
One preferred embodiment is: the length of the pressure-bearing nipple 7 below the connecting cavity 1 is larger than the sum of the length required by the setting stroke of a packer connected in a downhole operation pipe column and the height of the large four-way sealing body 3. Under the premise that the sealing effect between the pressure-bearing nipple 7 and the large four-way sealing body 3 is guaranteed by the sealing element 6, the underground operation pipe column can be moved in the testing operation and well repairing operation processes, the use of underground tools and packers connected in the underground operation pipe column is greatly facilitated, and the construction safety of a wellhead is guaranteed.
The application method of the utility model is as follows:
1. firstly, lifting a large four-way sealing body 3 through a lifting ring 2, and installing the large four-way sealing body in a wellhead large four-way;
2. according to the normal operation sequence, a large-diameter testing tool is put into a well through a downhole operation pipe column;
3. after the underground operation pipe column is put in place, connecting the pressure-bearing short joint 7 above the underground operation pipe column and setting the connecting cavity 1 above the large four-way sealing body 3 through the underground operation pipe column;
4. and connecting the short section of the oil pipe or the single oil pipe with the connecting cavity 1, and opening the testing valve to perform testing operation of the oil testing operation well or workover operation.
The embodiments described above are only exemplary embodiments, but the present utility model is not limited to these embodiments, and modifications may be made by those skilled in the art without departing from the spirit and scope of the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, improvement, etc. made within the spirit and concept of the present utility model should be included in the scope of the present utility model. Therefore, the scope of protection is not limited to the description above.
Claims (10)
1. The wellhead sealing device for underground operation is provided with a sealing element and is characterized in that the upper part of a pressure-bearing nipple is provided with a connecting cavity, the part provided with the connecting cavity in the pressure-bearing nipple can be located above a large four-way sealing body, and the lower part of the pressure-bearing nipple can be inserted into the large four-way sealing body; the sealing element comprises a large four-way sealing element and a sealing body sealing element, the large four-way sealing element is arranged outside the large four-way sealing body, and the sealing body sealing element is arranged between the large four-way sealing body and the pressure-bearing short joint; the large four-way seal body can be installed in a wellhead large four-way of an operation well.
2. The wellhead sealing device for downhole operations of claim 1, wherein the connecting chamber is connectable to a single tubing or a nipple of tubing, the lower portion of the pressure nipple being connectable to a tubing string for downhole operations; the internal thread in the connecting cavity and the external thread at the lower part of the pressure-bearing pup joint are oil pipe threads.
3. A wellhead sealing device for use in downhole operations as claimed in claim 1 or 2, wherein the lower end face of the outer wall of the connecting chamber is provided with an annular boss; the sealing body sealing piece is arranged on the outer wall of the pressure-bearing pup joint below the connecting cavity, and the sealing body sealing piece on the outer wall of the pressure-bearing pup joint is arranged for more than six times.
4. The wellhead sealing device for downhole operation according to claim 1, wherein an annular groove corresponding to the annular boss of the lower end face of the outer wall of the connecting cavity is arranged on the outer side of the central hole of the upper end face of the large four-way sealing body, and the annular boss of the lower end face of the connecting cavity is seated in the annular groove of the upper end face of the large four-way sealing body.
5. The wellhead sealing device for downhole operation according to claim 1 or 4, wherein chamfers are arranged at the upper end and the lower end of the large four-way sealing body, the outer diameter of the large four-way sealing body is consistent with the inner diameter of the large four-way of the wellhead, and the height of the large four-way sealing body is consistent with the height above a limit table in the inner cavity of the large four-way of the wellhead.
6. A wellhead sealing device for use in downhole operations as recited in claim 5, wherein the large four-way seal disposed on the outer wall of the large four-way seal body has at least two passes.
7. The wellhead sealing device for downhole operation according to claim 6, wherein a sealing cup mounting groove is further formed in the lower end face of the outer side of the central hole of the large four-way sealing body, a sealing cup is arranged in the sealing cup mounting groove, and the sealing cup arranged in the sealing cup mounting groove is fixed through a gland and a fixing screw.
8. The wellhead sealing device for downhole operation of claim 7, wherein the outer diameter of the pressure-bearing nipple is smaller than the aperture of the central hole of the wellhead large four-way inner cavity limiting table, the outer diameter of the sealing cup in a free state is smaller than the outer diameter of the large four-way sealing body, and the sealing cup can penetrate from the central hole of the wellhead large four-way limiting table to the lower side of the wellhead large four-way limiting table.
9. The wellhead sealing device for downhole operations of claim 8, wherein a lifting ring is installed on the upper end surface of the large four-way sealing body and outside the connecting cavity.
10. A wellhead sealing device for use in downhole operations as claimed in claim 3, wherein the length of the sub-chamber is greater than the sum of the length required for the setting stroke of a packer connected in the tubular string and the height of the large four-way seal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320321166.8U CN219953288U (en) | 2023-02-27 | 2023-02-27 | Wellhead sealing device for underground operation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320321166.8U CN219953288U (en) | 2023-02-27 | 2023-02-27 | Wellhead sealing device for underground operation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219953288U true CN219953288U (en) | 2023-11-03 |
Family
ID=88546541
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320321166.8U Active CN219953288U (en) | 2023-02-27 | 2023-02-27 | Wellhead sealing device for underground operation |
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