CN207686684U - Christmas tree and self-blowing well oil production system - Google Patents
Christmas tree and self-blowing well oil production system Download PDFInfo
- Publication number
- CN207686684U CN207686684U CN201721741347.7U CN201721741347U CN207686684U CN 207686684 U CN207686684 U CN 207686684U CN 201721741347 U CN201721741347 U CN 201721741347U CN 207686684 U CN207686684 U CN 207686684U
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- China
- Prior art keywords
- waxing
- oil nozzle
- production tree
- valve
- branch pipe
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 67
- 241000191291 Abies alba Species 0.000 title 1
- 238000007664 blowing Methods 0.000 title 1
- 238000011084 recovery Methods 0.000 claims abstract description 4
- 238000004018 waxing Methods 0.000 claims description 101
- 239000004576 sand Substances 0.000 claims description 17
- 238000000605 extraction Methods 0.000 claims description 7
- 210000002445 nipple Anatomy 0.000 claims description 4
- 239000003921 oil Substances 0.000 description 89
- 239000001993 wax Substances 0.000 description 21
- 239000003129 oil well Substances 0.000 description 15
- 239000010779 crude oil Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 6
- 239000012188 paraffin wax Substances 0.000 description 6
- 239000007789 gas Substances 0.000 description 5
- 230000000903 blocking effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000011017 operating method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 244000147058 Derris elliptica Species 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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- Pipeline Systems (AREA)
Abstract
The utility model provides a production tree and flowing well oil recovery system. Wherein the production tree includes: a pipeline structure; the oil nozzle is arranged in the pipeline structure; the choke plug is arranged in the pipeline structure and is arranged at intervals with the oil nozzle; the first end of the wax removal branch pipe is communicated with the pipeline structure and is positioned at the position of the oil nozzle, and the second end of the wax removal branch pipe is communicated with the pipeline structure and is positioned between the oil nozzle and the plug; the wax removal valve is arranged on the wax removal branch pipe. The utility model provides an inconvenient problem of production tree wax removal among the prior art.
Description
Technical field
The utility model is related to oil equipment technical field, recovering the oil in particular to a kind of production tree and flowing well is
System.
Background technology
Flowing well in oil field development controls to adjust oil well production, enrolls the means of production by its wellhead assembly, completes each
Class production operation.Flowing well wellhead assembly is made of production tree and resistance oil nozzle sleeve.Production tree is by size four-way and several high pressure locks
Plate valve forms, and connects under production tree and connects resistance oil nozzle sleeve in well on tubing string.Resistance oil nozzle sleeve is the internal thread that an intersegmental part carries M30, front end band
There is the Steel Tube Special of RC2 pipe screw threads.Mouth sleeve rear end is connected with production tree production valve.Root in resistance oil nozzle sleeve when flowing well produces
The oil nozzle of different-diameter is installed according to oil well actual conditions, controls yield.The crude oil of oil well output is passed through through production tree master valve, oil nozzle
Back-pressure gate enters ground flow line.
When flowing well produces, the wax in crude oil can constantly be precipitated from crude oil, be adhered on tube inner wall, reduce in oil stream
Row of channels, in some instances it may even be possible to block oil pipe, to keep oil pipe unimpeded, flowing well need to periodically carry out machine according to its tubing wax rule
Tool wax removal.It needs to carry out de-waxing operation after mechanical paraffin removal.As shown in Figure 1, flowing well de-waxing operating procedure is：1, production valve is closed
1；2, back pressure valve 2 is closed；3, open empty valve 3；4, plug 4 living is dismantled；5, with sleeve dismantle production oil nozzle 5 (aperture is smaller,
The wax scraped off can not pass through)；6, installation de-waxing oil nozzle (aperture 10mm)；7, plug 4 living is installed；8, emptying valve 3 is closed；9, it opens
Back pressure valve 2；10, production gate 1, several minutes of de-waxing or longer time are slowly opened.1-10 operations are repeated after de-waxing, are pacified again
Dress production oil nozzle, drive a well normal production.
There are following problems for the operation of flowing well de-waxing：1, operator closely contacts with oil gas.Especially hydrogen sulfide
The high oil well of content, there are certain risks when operation.2, crude oil landing is easily caused, environment is polluted.And crude oil splash to operation
On the clothing of person, increase the workload of cleaning foul.3, operating procedure mostly not only takes time and effort, and also adds the wind of maloperation
Danger.4, closing well 10 minutes or more is needed in operating, and is affected oil well to a certain extent and is normally produced.
Flowing well oil nozzle is blocked, and when checking oil nozzle operation, the oil nozzle that is blocked is opened up with cleansing pin.Due to oil nozzle be cased with it is certain
Depth, resistance oil nozzle sleeve and oil nozzle aperture are small, disclose out blocking oil nozzle bleed off oil nozzle rear pressure operation it is very inconvenient.It is big when encountering
When the oil well to drive a well after type pressure break, oil nozzle frequent jams check that the operation of oil nozzle is also very frequent and labor intensity is big.
Frequently dismounting production oil nozzle, it is also possible to oil nozzle occur and do not tighten, under oil-air pressure effect, oil nozzle punching is de-, leads
The problems such as cause production pressure increases suddenly, and oil reservoir seriously shakes out, destruction stratum.
It follows that there is de-waxing inconvenience in production tree in the prior art.
Utility model content
The main purpose of the utility model is to provide a kind of production trees and flowing well oil extraction system, to solve the prior art
In production tree de-waxing inconvenience problem.
To achieve the goals above, one side according to the present utility model provides a kind of production tree, including：Pipeline
Structure；Oil nozzle, oil nozzle are arranged in pipeline structure；Plug, plug are arranged in pipeline structure and are arranged with oil nozzle interval；De-waxing
The first end of branch pipe, de-waxing branch pipe is connected to pipeline structure and is located at the position where oil nozzle, the second end of de-waxing branch pipe with
Pipeline structure is connected to and between oil nozzle and plug；De-waxing valve, de-waxing valve are arranged on de-waxing branch pipe.
Further, de-waxing branch pipe is connected to the arrival end of oil nozzle.
Further, de-waxing valve includes shut-off valve, and shut-off valve is in normally off in well recovery.
Further, production tree further includes warning part, and warning part is arranged on de-waxing branch pipe to prompt shut-off valve to be in normal
Closed state.
Further, the junction of de-waxing branch pipe and pipeline structure is connected by female thread.
Further, de-waxing branch pipe includes first segment, second segment and third section and the 4th section, wherein first segment has the
One end is simultaneously connected to pipeline structure, and first segment is connect with second segment by de-waxing valve, and second segment and the 4th section pass through third section
One end of connection, the 4th section of separate third section is second end.
Further, second segment includes the connected in sequence first sub- pipeline, articulation and the second sub- pipeline, the first sub- pipeline
It is connect with de-waxing valve, the second sub- pipeline is connected to third section.
Further, third section is elbow；And/or in first segment, the first sub- pipeline, the second sub- pipeline or the 4th section extremely
Few one is pipe nipple.
Further, production tree further includes sand control cap, and sand control cap is coated on outside oil nozzle and in pipeline structure.
Another aspect according to the present utility model, provides a kind of flowing well oil extraction system, including flowing well ontology and adopts
Oil tree, production tree are arranged on flowing well ontology, and production tree is above-mentioned production tree.
Using the technical solution of the utility model, production tree includes pipeline structure, oil nozzle, plug, de-waxing branch pipe and de-waxing
Valve, oil nozzle are arranged in pipeline structure；Plug is arranged in pipeline structure and is arranged with oil nozzle interval；The first of de-waxing branch pipe
It holds at the position where oil nozzle is connected to and be located at pipeline structure, the second end of de-waxing branch pipe is connected to pipeline structure and positioned at oil
Between mouth and plug；De-waxing valve is arranged on de-waxing branch pipe.
When needing de-waxing, de-waxing valve is opened, since the tube wall of de-waxing branch pipe is relatively large in diameter, while in the work of overpressure
Under, then the wax in pipeline structure outside oil nozzle flows out weight from the first end person who lives in exile of de-waxing branch pipe from the second end of de-waxing branch pipe
Newly entering pipeline structure, the transfer of wax effectively prevents paraffin blockage plug oil nozzle without oil nozzle, in addition, in not de-waxing, row
Wax valve is closed, and the flow of crude oil is controlled by oil nozzle, in this way, while not influencing oil well normal production work, by pipeline
In wax handled, not only save the time, but also alleviate the workload of staff.
Description of the drawings
The accompanying drawings which form a part of this application are used to provide a further understanding of the present invention, this practicality
Novel illustrative embodiments and their description are not constituted improper limits to the present invention for explaining the utility model.
In the accompanying drawings：
Fig. 1 shows the structural schematic diagram of production tree in the prior art；
Fig. 2 shows the structural schematic diagrams of the production tree of embodiment according to the present utility model；
Fig. 3 shows the partial enlarged view of Fig. 2.
Wherein, above-mentioned attached drawing includes the following drawings label：
1, valve is produced；2, back pressure valve；3, it is vented valve；4, plug living；5, oil nozzle is produced；10, pipeline structure； 20、
Oil nozzle；30, plug；40, de-waxing branch pipe；41, first segment；42, second segment；421, the first sub- pipeline；422, articulation；423,
Two sub- pipelines；43, third section；44, the 4th section；50, de-waxing valve；60, sand control cap.
Specific implementation mode
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.The utility model will be described in detail below with reference to the accompanying drawings and embodiments.
It should be pointed out that unless otherwise specified, all technical and scientific terms used in this application have and the application
The normally understood identical meanings of person of an ordinary skill in the technical field.
In the present invention, in the absence of explanation to the contrary, the noun of locality used such as " upper and lower, top, bottom " is usually
It is for direction shown in the drawings, or for component itself is on vertical, vertical or gravity direction；Together
Sample, it for ease of understanding and describes, " inside and outside " refers to the inside and outside of the profile relative to each component itself, but the above-mentioned noun of locality is simultaneously
It is not used in limitation the utility model.
In order to solve the problems, such as that production tree de-waxing in the prior art is inconvenient, the utility model provide a kind of production tree and
Flowing well oil extraction system.Wherein, flowing well oil extraction system has following production trees.
As shown in Figure 2 and Figure 3, production tree includes pipeline structure 10, oil nozzle 20, plug 30, de-waxing branch pipe 40 and de-waxing valve
50, oil nozzle 20 is arranged in pipeline structure 10；The setting of plug 30 is spaced setting in pipeline structure 10 and with oil nozzle 20；De-waxing branch
The first end of pipe 40 is connected to pipeline structure 10 and at the position where oil nozzle 20, the second end and pipeline of de-waxing branch pipe 40
Structure 10 is connected to and between oil nozzle 20 and plug 30；De-waxing valve 50 is arranged on de-waxing branch pipe 40.
When needing de-waxing, de-waxing valve 50 is opened, since the tube wall of de-waxing branch pipe 40 is relatively large in diameter, while in overpressure
Under the action of, wax in pipeline structure 10 outside oil nozzle 20 is from the first end person who lives in exile of de-waxing branch pipe 40, then from de-waxing branch pipe 40
Second end outflow reenters pipeline structure 10, and the transfer of wax effectively prevents paraffin blockage plug oil nozzle 20 without oil nozzle 20,
In addition, in not de-waxing, de-waxing valve 50 is closed, and the flow of crude oil is controlled by oil nozzle 20, in this way, normal not influencing oil well
While production work, the wax in pipeline is handled, not only saves the time, but also alleviates the workload of staff.
It should be noted that installing de-waxing valve 50 additional, it will not leak, not influence produced liquid in oil well amount, it is fixed to use
Phase blocks M30 screw holes, the method for closing de-waxing valve 50, tight when whether verification de-waxing valve 50.
In addition, when de-waxing, the opening size that de-waxing valve 50 is adjusted when observing the size of back pressure is needed, wherein aperture
Size and de-waxing duration can be according to back pressure values when using major diameter de-waxing 20 de-waxing of oil nozzle.
Oil flow production well wax content in crude oil is higher, and daily requirement progress mechanical paraffin removal is primary, replaces oil nozzle 20 twice daily,
About 20 minutes.It need not carry out replacing oil nozzle 20 after the utility model, in half a year and operate, without residual wax at oil nozzle 20,
Without 20 phenomenon of stifled oil nozzle.The 50 tight ne-leakage in each junction of de-waxing valve；De-waxing valve 50 does not leak tightly when closing, just to oil well
Often production has no effect.During normal production, each technological parameter is consistent with parameter under former technological process operating mode for oil well.
Preferably, the first end of de-waxing branch pipe 40 is connected in pipeline structure 10 and positioned at the position where oil nozzle 20
Place using welding one DN20 high pressure female thread, with previous communicating position at 300 millimeters of distance place, i.e., in de-waxing branch pipe
40 second end is connected to pipeline structure 10 and between oil nozzle 20 and plug 30, is welded with another welding female thread.
In flowing well oil extraction system, including flowing well ontology and production tree, production tree are arranged on flowing well ontology.
As shown in figure 3, de-waxing branch pipe 40 is connected to the arrival end of oil nozzle 20.The wax of 20 inlet of oil nozzle flows into de-waxing branch pipe
In 40, paraffin blockage plug oil nozzle 20 is effectively prevented, ensure that the normal work of oil nozzle 20, and then ensure the normal production work of oil well
Make.
As shown in figure 3, de-waxing valve 50 includes shut-off valve, shut-off valve is in normally off in well recovery.Shut-off valve
As switch, when needing de-waxing, shut-off valve is opened, when not needing de-waxing, closes shut-off valve, it in this way can be to avoid de-waxing branch pipe
40, which influence oil nozzle 20, controls oil flow, ensure that the normal production work of oil well.
Preferably, shut-off valve is DN20 high-pressure stop angle valves.
Preferably, production tree further includes warning part, and warning part is arranged on de-waxing branch pipe 40 to prompt shut-off valve to be in normal
Closed state.Warning part has the function of warning, can remind the working condition of staff's current expiration valve, it is improper to avoid causing
Operation.
As shown in figure 3, de-waxing branch pipe 40 is connect with the junction of pipeline structure 10 by female thread.Using the connection side of female thread
Formula, simple in structure, convenient disassembly, good airproof performance.
Preferably, female thread is welding form.
As shown in figure 3, de-waxing branch pipe 40 includes first segment 41, second segment 42 and third section 43 and the 4th section 44, wherein the
There is for one section 41 first end and be connected to pipeline structure 10, first segment 41 is connect with second segment 42 by de-waxing valve 50, and second
Section 42 is connected to the 4th section 44 by third section 43, and one end of the 4th section 44 of separate third section 43 is second end.Pipeline structure
Wax in 10 enters de-waxing branch pipe 40 by the first end of the first segment 41 of de-waxing branch pipe 40, then enters the through de-waxing valve 50
Two section 42, third section 43 and the 4th section 44 are again passed through, the other end of pipeline structure 10 is eventually passed back to, in this way, in pipeline structure 10
Wax outside oil nozzle 20 flows away by de-waxing branch pipe 40, effectively prevents paraffin blockage plug oil nozzle 20.
As shown in figure 3, second segment 42 includes the connected in sequence first sub- pipeline 421, articulation 422 and the second sub- pipeline
423, the first sub- pipeline 421 is connect with de-waxing valve 50, and the second sub- pipeline 423 is connected to third section 43.Second segment 42 is level
Section is the bridge for being connected to first segment 41 and second segment 42, is the critical piping for conveying wax, wherein articulation 422 is by the first word pipe
Together with road and the second word piping connection, in addition, articulation 422 can activity, convenient disassembly is easy to operate, and sealing effect is good.
Preferably, the first sub- pipeline 421 and the second sub- pipeline 423 are DN20 high pressure pipe nipples, and articulation 422 is DN20 high pressures
Articulation 422.
As shown in figure 3, third section 43 is elbow；And/or first segment 41, the first sub- pipeline 421, the second sub- pipeline 423 or
4th section at least one of 44 is pipe nipple.Wherein, elbow not only has connection function, but also can change de-waxing branch pipe 40
Direction.
Preferably, elbow is DN20 high pressure elbows.
As shown in figure 3, production tree further includes sand control cap 60, sand control cap 60 is coated on outside oil nozzle 20 and is located at pipeline structure 10
It is interior.Sand control cap 60 is simple in structure, and cost is relatively low, and has filtration, can filter out the solid impurity in crude oil, prevents
Only oil nozzle 20 is blocked, in addition, the import due to de-waxing branch pipe 40 is arranged above sand control cap 60, when de-waxing, in High Pressure Difference
Under effect, the gas stream told rinses the wax that 60 surface of sand control cap is adhered to well.
It can be seen from the above description that the above embodiments of the present invention achieve the following technical effects：
1, de-waxing branch pipe 40 is in the top at oil nozzle 20, and medium is oil association in de-waxing when de-waxing valve 50 is closed
Gas, will not sand setting, will not coagulate stifled, it can be ensured that be used for a long time；
2, when flowing well produces, due to being equipped with sand control cap 60, sand control cap is attached to the wax disk(-sc) that gas stream is taken out of after wax removal
60 surfaces, 40 entrance of de-waxing branch pipe are located at the top of sand control cap 60, and when de-waxing, under the action of High Pressure Difference, the gas stream of high speed will prevent
The wax of 60 surface of sand cap attachment is rinsed well；
3, responding curve of well de-waxing is realized, it is daily to increase by 10 minutes oil well production time, improve oil well production efficiency；
4, it eliminates and dismounts the operation of simple oil nozzle 20 twice, alleviate labor intensity, eliminate operating process Central Plains greasy dirt
The risk that dye and leakage are hurted sb.'s feelings；
5, in the case of by 40 timely de-waxing of de-waxing branch pipe, 20 clogging of oil nozzle will not occur；
6, when oil nozzle 20 because sand production blocks the special circumstances such as sand control cap 60, after blocking, de-waxing valve 50 is opened,
Pressure before and after oil nozzle 20 is discharged, tamper can be quickly cleaned, substantially reduces the risk and dredging oil nozzle of the blocking of oil nozzle 20
20 difficulty；
7, dismounting plug 30 need not be repeated, a large amount of sealing material is saved.
Obviously, above-mentioned described embodiment is only the embodiment of the utility model part, rather than whole realities
Apply example.Based on the embodiments of the present invention, those of ordinary skill in the art institute without making creative work
The every other embodiment obtained should all belong to the range of the utility model protection.
It should be noted that term used herein above is merely to describe specific implementation mode, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singulative
It is also intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, work, device, component and/or combination thereof.
It should be noted that term " first " in the description and claims of this application and above-mentioned attached drawing, "
Two " etc. be for distinguishing similar object, without being used to describe specific sequence or precedence.It should be appreciated that using in this way
Data can be interchanged in the appropriate case, so that presently filed embodiment described herein can be in addition to illustrating herein
Or the sequence other than those of description is implemented.
The above descriptions are merely preferred embodiments of the present invention, is not intended to limit the utility model, for this
For the technical staff in field, various modifications and changes may be made to the present invention.It is all in the spirit and principles of the utility model
Within, any modification, equivalent replacement, improvement and so on should be included within the scope of protection of this utility model.
Claims (10)
1. a kind of production tree, which is characterized in that including：
Pipeline structure (10)；
Oil nozzle (20), oil nozzle (20) setting is in the pipeline structure (10)；
Plug (30), plug (30) setting are spaced setting in the pipeline structure (10) and with the oil nozzle (20)；
The first end of de-waxing branch pipe (40), the de-waxing branch pipe (40) is connected to the pipeline structure (10) and is located at the oil nozzle
(20) at the position where, the second end of the de-waxing branch pipe (40) is connected to the pipeline structure (10) and is located at the oil nozzle
(20) between the plug (30)；
De-waxing valve (50), the de-waxing valve (50) are arranged on the de-waxing branch pipe (40).
2. production tree according to claim 1, which is characterized in that the de-waxing branch pipe (40) enters with the oil nozzle (20)
The connection of mouth end.
3. production tree according to claim 1, which is characterized in that the de-waxing valve (50) includes shut-off valve, described section
Only valve is in normally off in well recovery.
4. production tree according to claim 3, which is characterized in that the production tree further includes warning part, the warning part
It is arranged on the de-waxing branch pipe (40) to prompt the shut-off valve to be in normally off.
5. production tree according to claim 1, which is characterized in that the de-waxing branch pipe (40) and the pipeline structure (10)
Junction connected by female thread.
6. production tree according to any one of claim 1 to 5, which is characterized in that the de-waxing branch pipe (40) includes the
One section (41), second segment (42) and third section (43) and the 4th section (44), wherein the first segment (41) has the first end
And be connected to the pipeline structure (10), the first segment (41) is connected with the second segment (42) by the de-waxing valve (50)
Connect, the second segment (42) is connected to the 4th section (44) by the third section (43), the 4th section (44) it is separate
One end of the third section (43) is the second end.
7. production tree according to claim 6, which is characterized in that the second segment (42) includes the first son connected in sequence
Pipeline (421), articulation (422) and the second sub- pipeline (423), the first sub- pipeline (421) and the de-waxing valve (50)
Connection, the second sub- pipeline (423) are connected to the third section (43).
8. production tree according to claim 7, which is characterized in that
The third section (43) is elbow；And/or
In the first segment (41), the first sub- pipeline (421), the second sub- pipeline (423) or the 4th section (44)
It is at least one be pipe nipple.
9. production tree according to any one of claim 1 to 5, which is characterized in that the production tree further includes sand control cap
(60), the sand control cap (60) is coated on the oil nozzle (20) outside and in the pipeline structure (10).
10. a kind of flowing well oil extraction system, including flowing well ontology and production tree, the production tree is arranged in the flowing well sheet
On body, which is characterized in that the production tree is the production tree described in any one of claim 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721741347.7U CN207686684U (en) | 2017-12-13 | 2017-12-13 | Christmas tree and self-blowing well oil production system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721741347.7U CN207686684U (en) | 2017-12-13 | 2017-12-13 | Christmas tree and self-blowing well oil production system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207686684U true CN207686684U (en) | 2018-08-03 |
Family
ID=62997502
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721741347.7U Active CN207686684U (en) | 2017-12-13 | 2017-12-13 | Christmas tree and self-blowing well oil production system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207686684U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112682021A (en) * | 2020-12-08 | 2021-04-20 | 中国石油天然气股份有限公司 | Anti-blocking device for horizontal well self-blowing and anti-blocking system thereof |
| CN113738315A (en) * | 2020-05-28 | 2021-12-03 | 中国石油天然气股份有限公司 | Choke sleeve and wellhead assembly |
-
2017
- 2017-12-13 CN CN201721741347.7U patent/CN207686684U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113738315A (en) * | 2020-05-28 | 2021-12-03 | 中国石油天然气股份有限公司 | Choke sleeve and wellhead assembly |
| CN113738315B (en) * | 2020-05-28 | 2023-02-28 | 中国石油天然气股份有限公司 | Choke sleeve and wellhead assembly |
| CN112682021A (en) * | 2020-12-08 | 2021-04-20 | 中国石油天然气股份有限公司 | Anti-blocking device for horizontal well self-blowing and anti-blocking system thereof |
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