CN209687464U - Jet-preventing tool in oil pipe under underbalance - Google Patents
Jet-preventing tool in oil pipe under underbalance Download PDFInfo
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- CN209687464U CN209687464U CN201822218634.0U CN201822218634U CN209687464U CN 209687464 U CN209687464 U CN 209687464U CN 201822218634 U CN201822218634 U CN 201822218634U CN 209687464 U CN209687464 U CN 209687464U
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Abstract
The utility model relates to completion tubular column technical field of operation under underbalance, it is jet-preventing tool in oil pipe under a kind of underbalance, it includes tube body, level pressure plug, slot oil pipe and salvages blue, it is from top to bottom successively fixedly installed at least one slot oil pipe between bottom of the pipe and the upper end for salvaging indigo plant, liquid channel excessively up and down is distributed in the middle part of tube body and slot oil pipe.The utility model can prevent from spraying in oil pipe in oil pipe under underbalance, the lower oil pipe well control safety of effective guarantee, shear pin cutting is set to separate level pressure plug with interior land by suppressing, level pressure plug can be accepted by salvaging indigo plant, it prevents from it from forming subsequent job to interfere, the oil of reservoir can be entered in tube body by slot oil pipe, realized in oil pipe with reservoir connection, can be carried out gaslift under underbalance and go into operation.
Description
Technical field
It is blowout prevention work in oil pipe under a kind of underbalance the utility model relates to completion tubular column technical field of operation under underbalance
Tool.
Background technique
Currently, when implementing insufficient balance well completion operation, if the case where being fitted without oil pipe blowout tool on oil pipe into
Under row when oil pipe operation, stratum stream will be flow backwards by oil pipe, can slightly make well head operation very inconvenient, severe one will cause well control
It is out of control, serious consequence is caused, if but when implementing insufficient balance well completion using slurry pressure down-hole oil tube again, overall process owes flat
Weighing apparatus just loses meaning, at present traditional integrated Completion Techniques, exist in its technique of Yao Shiying under balance pressure drilling compared with
Big limitation, to guaranteeing preferably release, protection oil-gas Layer and realizing overall process under-balance completion practice, however it remains
The problem of fluid flows backwards generation blowout phenomenon by oil pipe under no killing well in insufficient balance well completion operation.At the same time, it recovers the oil the later period
When needing separate zone production, when carrying out perforation through tubing, acid fracturing, it is also necessary to play flowline, then play oil pipe again, in this way, making
The cumbersome production efficiency of industry process is low.
Summary of the invention
The utility model provides under a kind of underbalance jet-preventing tool in oil pipe, overcomes the defects of the prior art,
It, which can effectively solve in existing insufficient balance well completion operation fluid under no killing well and is flow backwards by oil pipe, occurs blowout, is layered and opens
Adopt the cumbersome production efficiency of work flow low problem when carrying out perforation through tubing, acid fracturing.
The technical solution of the utility model is realized by following measures: blowout prevention work in oil pipe under a kind of underbalance
Tool, including tube body, level pressure plug, slot oil pipe and salvaging are blue, between bottom of the pipe and the upper end for salvaging indigo plant from top to bottom successively
It is fixedly installed at least one slot oil pipe, liquid channel excessively up and down is distributed in the middle part of tube body and slot oil pipe, is cut
Be distributed with the slot that can be communicated with its inner cavity on seam oil pipe, salvage the salvaging blind way that blue middle part is equipped with opening upwards, tube body it is interior
Wall is equipped with interior land, is equipped with level pressure plug below interior land, the upper end of level pressure plug and the lower end of interior land mutually seal, level pressure
Plug and tube body are linked together by shear pin, set anchor ring equipped with wide at the top and narrow at the bottom on the inside of the upper end of interior land.
Here is the further optimization and/or improvements to above-mentioned utility model technical solution:
Above-mentioned level pressure plug may include the upper cover being from top to bottom connected in turn, cylinder and plug, and upper cover is plectane,
Upper cover is set in tube body, and the outer diameter of upper cover is greater than the internal diameter of interior land, and the diameter of cylinder is less than the diameter of upper cover, and plug is presented
Small bullet under big, the diameter of plug upper end and the diameter of cylinder are equal, and the center line of upper cover, cylinder and plug is in same axis
On line.
The shear pin that above-mentioned level pressure plug can be uniformly distributed along the circumference with tube body by two to six links together, corresponding every
The pin hole being sleeved on the outside of shear pin is distributed on the cylinder of a shear pin position, corresponding each shear pin position
The through-hole being sleeved on the outside of shear pin is distributed on tube body.
Sealing ring can be fixedly installed between above-mentioned level pressure plug and interior land.
Two groups of slot groups can be from top to bottom intervally distributed on above-mentioned slot oil pipe, between every group of slot group includes multiple etc.
Every the slot of distribution, every group of slot group is twist distributed along slot oil pipe periphery, and the helical angle of every group of slot group is 30 °
To between 45 °.
Above-mentioned salvaging indigo plant may include salvaging casing and guiding connector, salvages casing part and is fixed with guiding connector, guiding connects
Head is in up big and down small hollow cone, and the maximum outside diameter for being oriented to connector is equal with the outer diameter of casing is salvaged, and is oriented to connector most
Large diameter is equal with the internal diameter of casing is salvaged.
The lower outside of above-mentioned tubular body can be connected through a screw thread fixed peace with the upper end inside for the slot oil pipe for being located at top
It is fitted together, by being connected through a screw thread fixed peace on the outside of the upper end blue positioned at the lower end inside of the slot oil pipe of bottom and salvaging
It is fitted together.
The above-mentioned bus for setting anchor ring can be arc-shaped, and setting seat at anchor ring has the setting ball that can be sealed engagement therewith, and be sat
The diameter of blocking is greater than the minimum diameter for setting anchor ring.
The utility model reasonable and compact in structure, easy to use, jet-preventing tool passes through level pressure plug in oil pipe under underbalance
It is mutually sealed with interior land, and so that level pressure plug is linked together with tube body by shear pin, can prevented in oil pipe under underbalance
Only spray in oil pipe, the lower oil pipe well control safety of effective guarantee, by suppressing makes shear pin cutting that can make level pressure plug and inner ring
Platform separates, and level pressure plug can be accepted by salvaging indigo plant, prevents it from being formed to subsequent job and interferes, the oil of reservoir can pass through slot oil pipe
Into in tube body, realizes in oil pipe with reservoir connection, gaslift under underbalance can be carried out and gone into operation, by putting into setting ball in pipe string
The inner hole for setting anchor ring can be blocked, so that the lower part of jet-preventing tool in oil pipe under underbalance is in sealing state, oil pipe can be carried out
Operation is transformed in perforation, acid fracturing, and multinomial joint can be completed under under-balanced state using jet-preventing tool in oil pipe under underbalance
Oil producing operation realizes that oil pipe blowout, gaslift operation, perforation through tubing, acid fracturing one-trip string fulfil assignment under underbalance, have
Effect simplifies cumbersome operation operation, simplifies operation technological process, shortens duty cycle, improves operating efficiency, has operation letter
It is single, time saving and energy saving, convenient and efficient, the high feature of overall process under-balance completion practice success rate.
Detailed description of the invention
Attached drawing 1 is schematic diagram of main cross-sectional structure of the utility model.
Attached drawing 2 is the work flow diagram of the utility model.
Coding in attached drawing is respectively as follows: 1 for tube body, and 2 be steel ball, and 4 be shear pin, and 5 be sealing ring, and 6 be slot oil pipe,
7 is blue to salvage, and 8 be inner convex platform, and 9 is set anchor ring, and 10 be slot, and 11 be upper cover, and 12 be cylinder, and 13 be plug, and 14 be to salvage
Casing, 15 be guiding connector, and 16 be pin hole, and 17 be through-hole.
Specific embodiment
The utility model is not limited by following embodiments, can technical solution according to the present utility model and actual conditions
Determine specific embodiment.
In the present invention, for ease of description, the description of the relative positional relationship of each component is according to specification
The Butut mode of attached drawing 1 is described, such as: front, rear, top, and bottom, left and right positional relationship be according to Figure of description
Butut direction determine.
The utility model is further described below with reference to examples and drawings:
As shown in Fig. 1, jet-preventing tool includes tube body 1, level pressure plug, slot oil pipe 6 and beats in oil pipe under the underbalance
Fishing is blue, is from top to bottom successively fixedly installed at least one slot oil pipe 6, tube body 1 between 1 lower end of tube body and the upper end for salvaging indigo plant
With the middle part of slot oil pipe 6 be distributed with up and down cross liquid channel, being distributed on slot oil pipe 6 can communicate with its inner cavity
Slot 10, salvages the salvaging blind way that blue middle part is equipped with opening upwards, and the inner wall of tube body 1 is equipped with interior land 8, interior 8 lower section of land
Equipped with level pressure plug, the upper end of level pressure plug and the lower end of interior land 8 are mutually sealed, and level pressure plug and tube body 1 pass through shear pin 4
It links together, sets anchor ring 9 equipped with wide at the top and narrow at the bottom on the inside of the upper end of interior land 8.According to demand, when slot oil pipe 6 is more
When a, every two adjacent slot oil pipes 6 can be fixedly installed togather or are fixedly installed togather by connecting short section.Use process
In, before entering well, first has to carry out pressure testing and Leakage Test to the present embodiment, well can be entered after ensuring qualification, it
After 1 upper end of tube body and conventionally known oil pipe can be joined together to form pipe string, then can be by the default of pipe string G.I.H
Position, during this, level pressure plug is connect with tube body 1 by shear pin 4, and makes level pressure plug and interior land 8 in seal shape
State can prevent spray in oil pipe, oil pipe well control safety under effective guarantee；It, can be by suppressing after arriving predetermined well depth under oil pipe
Cut shear pin 4, level pressure plug will separate with interior land 8 and pass through liquid channel and fall into salvaging blind way at this time, reservoir
Oil will enter liquid channel by slot 10, realize in oil pipe with reservoir connection, gaslift operation operation can be carried out；After oil recovery
It when phase carries out perforation through tubing, acid fracturing, does not need to play flowline again, only oil well pump need to be played out, by throwing in oil pipe
Enter setting ball 2, make setting ball 2 and set the sealing of anchor ring 9,1 lower part of tube body can be closed by setting ball 2, can set at this time
Perforation through tubing, acid fracturing operation are carried out in the pipe string of 9 top of anchor ring.The present embodiment reasonable and compact in structure, it is easy to use,
It is sealed with interior 8 phase of land by level pressure plug, and passing through shear pin 4 makes level pressure plug link together with tube body 1, can be
Prevent spray in oil pipe under underbalance in oil pipe, the lower oil pipe well control safety of effective guarantee makes the cutting of shear pin 4 can by suppressing
Separate level pressure plug with interior land 8, level pressure plug can be accepted by salvaging indigo plant, and it prevents it from being formed to subsequent job and interferes, reservoir
Oil can be entered in tube body 1 by slot oil pipe, realize in oil pipe with reservoir connection, gaslift can be carried out under underbalance and gone into operation, led to
It crosses and puts into setting ball 2 in pipe string and can block the inner hole for setting anchor ring 9, the lower part of the present embodiment is made to be in sealing state, it can be into
Operation is transformed in row perforation through tubing, acid fracturing, and the present embodiment can realize that oil pipe blowout under underbalance, gaslift go into operation, cross oil pipe
Perforation, acid fracturing one-trip string fulfil assignment, and effectively simplify cumbersome operation operation, shorten duty cycle, improve operation
Efficiency has the characteristics that safe, laborsaving, easy, efficient.According to demand, length of the tube body 1 from upper surface to lower end surface is
500mm, the length for salvaging blue upper surface to lower end surface are 300mm.The diameter of tube body 1 has φ 73mm, φ 89mm, φ 114mm tri-
Kind specification.The button-type of the present embodiment is executed fully according to API standard, and rated insulation voltage value is 35 MPa and two kinds of 70MPa, is cut
The length of seam oil pipe 6 can be adjusted according to the thickness of reservoir.
Jet-preventing tool in oil pipe under above-mentioned underbalance can be made further optimization and/or improvements according to actual needs:
As shown in Fig. 1, level pressure plug includes the upper cover 11 being from top to bottom connected in turn, cylinder 12 and plug
13, upper cover 11 is plectane, and upper cover 11 is set in tube body 1, and the outer diameter of upper cover 11 is greater than the internal diameter of interior land 8, cylinder 12 it is straight
Diameter is less than the diameter of upper cover 11, and plug 13 is in up big and down small bullet, the diameter phase of the diameter and cylinder 12 of 13 upper end of plug
Deng the center line of upper cover 11, cylinder 12 and plug 13 is on the same axis.In this way, after the cutting of shear pin 4, tapered body
Plug can play guiding role, it is ensured that level pressure plug smoothly slide to salvage basket in.
As shown in Fig. 1, level pressure plug is connected to one by two to six shear pins 4 being uniformly distributed along the circumference with tube body 1
It rises, the pin hole 16 for being sleeved on 4 outside of shear pin is distributed on the cylinder 12 of corresponding each 4 position of shear pin, it is corresponding every
The through-hole 17 for being sleeved on 4 outside of shear pin is distributed on the tube body 1 of a 4 position of shear pin.In this way, level pressure plug can be made
It is connect with tube body 1 more stable, and stress is more evenly.
As shown in Fig. 1, sealing ring 5 is fixedly installed between level pressure plug and interior land 8.In this way, can further be
Reliable leakproofness is provided between level pressure plug and interior land 8.According to demand, conventionally known sealing ring can be used in sealing ring 5
Technology, such as rectangular seal.
As shown in Fig. 1, two groups of slot groups are from top to bottom intervally distributed on slot oil pipe 6, every group of slot group includes
Multiple slots 10 being spacedly distributed, every group of slot group are twist distributed along 6 periphery of slot oil pipe, the spiral shell of every group of slot group
Swing angle is between 30 ° to 45 °.The length and width of slot 10 can be set according to reservoir yield, formation sand production particle size situation
Meter, thus can have good anti-grittiness, so that oil recovery quality can be improved in oil recovery process.
As shown in Fig. 1, salvaging blue includes salvaging casing 14 and guiding connector 15, salvages 14 lower part of casing and is fixed with guiding
Connector 15, guiding connector 15 are in up big and down small hollow cone, are oriented to the maximum outside diameter of connector 15 and salvage the outer of casing 14
Diameter is equal, and the maximum inner diameter for being oriented to connector 15 is equal with the internal diameter of casing 14 is salvaged.Thus it can pass through the shape of guiding connector 15
Guiding role is played to the decentralization of pipe string, the bellmouth by being oriented to connector 15 can play salvaging with the external shape fits of plug 13
The effect of limit.
As shown in Fig. 1, the lower outside of tube body 1 is connected on the inside of the upper end for the slot oil pipe 6 for being located at top by screw thread
It connects and is fixedly installed togather, by passing through screw thread on the outside of the upper end blue positioned at the lower end inside of the slot oil pipe 6 of bottom and salvaging
It is connected and fixed and is installed together.Thus can be connected through a screw thread makes it be easy for installation and removal, and screw thread button-type can be marked according to API
Standard executes.
As shown in Fig. 1, the bus for setting anchor ring 9 is arc-shaped, and setting seat at anchor ring 9 has the seat that can be sealed engagement therewith
Blocking 2, the diameter of setting ball 2 are greater than the minimum diameter for setting anchor ring 9.In use, setting ball 2 should be taken before transferring pipe string
Out, when needing to carry out perforation through tubing, acid fracturing, setting ball 2 can be put into pipe string, and send to setting anchor ring 9 and makes two
Person's sealing, thus can reach the condition of perforation through tubing, acid fracturing operation；By being arc-shaped the bus for setting anchor ring 9
It can make it that there is with setting ball 2 better sealing, make it have and good set effect.According to demand, setting ball 2 can be used
Existing well-known technique, such as steel ball.
It as shown in Fig. 2, is the formula underbalance joint oil production method of jet-preventing tool in oil pipe under underbalance, packet below
Include that steps are as follows:
(1) after completing reservoir drilling well work using Unbalance technique, under-balanced state tripping in screen casing, to pre-determined bit under screen casing
Postpone setting trip-out；
(2) pipe string is formed at the lower part that jet-preventing tool is installed on oil pipe in oil pipe under underbalance, is transferred in under-balanced state
Pipe string, until oil pipe transfers to predetermined position；
(3) setting tubing hanger, setting production tree；
(4) by the shear pin 4 cut under underbalance in oil pipe in jet-preventing tool that builds the pressure, level pressure plug, which is fallen into, to be beaten
In fishing basket, the inner cavity of oil pipe by by tube body 1 and slot oil pipe cross liquid channel and slot 10 is established inside and outside oil pipe be connected to and be led to
Road；
(5) selection suitable method is gone into operation, specifically: if reservoir energy reaches self-spray operation condition, direct self-spray is produced
Oil；If reservoir energy is not up to self-spray operation condition, gaslift induced flow is gone into operation；If gaslift induced flow is not up to self-spray operation condition,
Lower oil well pump turns suction and recovers the oil；
(6) it recovers the oil the later period, when needing to carry out separate zone production, it is only necessary to act sucker rod and oil well pump, be put into pipe string
Build the pressure ball, and the ball that makes to build the pressure is set in setting at anchor ring 9, completes the closure to 9 lower section tube body of anchor ring is set, and closes oil under underbalance
Jet-preventing tool in managing；
(7) perforation through tubing operation and fracturing reform operation are carried out under under-balanced state；
(8) gas lift liquid drainage, lower oil well pump and sucker rod are carried out, pumping oil producing operation is restored.
Multinomial joint oil producing operation can be completed under under-balanced state using the present embodiment, realize that oil pipe is anti-under underbalance
Spray, gaslift operation, perforation through tubing, acid fracturing one-trip string fulfil assignment, and solve to meet in completion tubular column operation under underbalance
The problem seen above mentions and lower square tube string without repeated multiple times, simplifies operation technological process, have it is easy to operate, it is time saving and energy saving, just
Prompt efficient, the high feature of overall process under-balance completion practice success rate is moved on to, fracturing reform by insufficient balance well completion and downstream
Technology linking, effectively shorten oil/gas well production cycle, reservoir pollution can be minimized, reduce operating cost, accelerate to build
Produce paces；The present embodiment realizes overall process snubbing serving, can protect reservoir to greatest extent；By preventing in oil pipe under underbalance
The setting of spray tool can cut shear pin by the method that builds the pressure, establish oil in under-balanced state after oil pipe is transferred in place
Inside and outside communicating passage is managed, thus can directly carry out gaslift operation, suction is gone into operation；It needs separate zone production in the suction oil recovery later period
When, oil well pump only need to be played out, then jet-preventing tool in oil pipe is closed under underbalance in pitching, and oil can be carried out under no killing well state
Pipe perforation and fracturing reform do not need to carry out well pulling job, reduce duty cycle and cost.
The above technical characteristic constitutes the embodiments of the present invention, can with stronger adaptability and implementation result
Increase and decrease non-essential technical characteristic, according to actual needs to meet the needs of different situations.
Claims (11)
1. jet-preventing tool in oil pipe under a kind of underbalance, it is characterised in that including tube body, level pressure plug, slot oil pipe and salvaging
Indigo plant, bottom of the pipe and salvages and is from top to bottom successively fixedly installed at least one slot oil pipe between blue upper end, tube body and cuts
It is distributed with liquid channel excessively up and down in the middle part of seam oil pipe, the slot that can be communicated with its inner cavity is distributed on slot oil pipe,
The salvaging blind way that indigo plant middle part is equipped with opening upwards is salvaged, the inner wall of tube body is equipped with interior land, blocks up below interior land equipped with level pressure
Head, the upper end of level pressure plug and the lower end of interior land mutually seal, and level pressure plug and tube body are linked together by shear pin, interior
Anchor ring is set equipped with wide at the top and narrow at the bottom on the inside of the upper end of land.
2. jet-preventing tool in oil pipe under underbalance according to claim 1, it is characterised in that level pressure plug include by up to
Under the upper cover, cylinder and the plug that are connected in turn, upper cover is plectane, and upper cover is set in tube body, and the outer diameter of upper cover is greater than
The internal diameter of interior land, the diameter of cylinder are less than the diameter of upper cover, and plug is in up big and down small bullet, the diameter of plug upper end with
The diameter of cylinder is equal, and the center line of upper cover, cylinder and plug is on the same axis.
3. jet-preventing tool in oil pipe under underbalance according to claim 2, it is characterised in that level pressure plug passes through with tube body
Two to six shear pins being uniformly distributed along the circumference link together, and are distributed with set on the cylinder of corresponding each shear pin position
Pin hole on the outside of shear pin is distributed on the tube body of corresponding each shear pin position and is sleeved on the outside of shear pin
Through-hole.
4. jet-preventing tool in oil pipe under underbalance according to claim 1 or 2 or 3, it is characterised in that level pressure plug with it is interior
Sealing ring is fixedly installed between land.
5. jet-preventing tool in oil pipe under underbalance according to claim 1 or 2 or 3, it is characterised in that on slot oil pipe by
Two groups of slot groups are intervally distributed under, every group of slot group includes multiple slots being spacedly distributed, and every group of slot group is equal
It is twist distributed along slot oil pipe periphery, the helical angle of every group of slot group is between 30 ° to 45 °.
6. jet-preventing tool in oil pipe under underbalance according to claim 1 or 2 or 3, it is characterised in that on slot oil pipe by
Two groups of slot groups are intervally distributed under, every group of slot group includes multiple slots being spacedly distributed, and every group of slot group is equal
It is twist distributed along slot oil pipe periphery, the helical angle of every group of slot group is between 30 ° to 45 °.
7. jet-preventing tool in oil pipe under underbalance according to claim 1 or 2 or 3, it is characterised in that salvaging blue includes beating
Casing and guiding connector are fished out, casing part is salvaged and is fixed with guiding connector, guiding connector is in up big and down small hollow cone, is led
Maximum outside diameter to connector is equal with the outer diameter of casing is salvaged, and the maximum inner diameter for being oriented to connector is equal with the internal diameter of casing is salvaged.
8. jet-preventing tool in oil pipe under underbalance according to claim 6, it is characterised in that salvaging blue includes salvaging casing
It with guiding connector, salvages casing part and is fixed with guiding connector, guiding connector is in up big and down small hollow cone, is oriented to connector
Maximum outside diameter it is equal with the outer diameter of casing is salvaged, it is equal with the salvaging internal diameter of casing to be oriented to the maximum inner diameter of connector.
9. jet-preventing tool in oil pipe under underbalance according to claim 1 or 2 or 3, it is characterised in that outside the lower part of tube body
It is connected through a screw thread and is fixedly installed togather on the inside of side and the upper end for the slot oil pipe for being located at top, the slot oil pipe positioned at bottom
Lower end inside and salvage to be connected through a screw thread on the outside of blue upper end and be fixedly installed togather；Or/and set the mother of anchor ring
Line is arc-shaped, and setting seat at anchor ring has the setting ball that can be sealed engagement therewith, and the diameter of setting ball, which is greater than, sets anchor ring most
Small internal diameter.
10. jet-preventing tool in oil pipe under underbalance according to claim 6, it is characterised in that the lower outside of tube body and position
It is connected through a screw thread and is fixedly installed togather on the inside of the upper end of the slot oil pipe at top, positioned at the lower end of the slot oil pipe of bottom
It is connected through a screw thread and is fixedly installed togather on the outside of inside and the upper end for salvaging indigo plant；Or/and the bus of anchor ring is set in circle
Arc, setting seat at anchor ring has the setting ball that can be sealed engagement therewith, and the diameter of setting ball is greater than the minimum diameter for setting anchor ring.
11. jet-preventing tool in oil pipe under underbalance according to claim 7, it is characterised in that the lower outside of tube body and position
It is connected through a screw thread and is fixedly installed togather on the inside of the upper end of the slot oil pipe at top, positioned at the lower end of the slot oil pipe of bottom
It is connected through a screw thread and is fixedly installed togather on the outside of inside and the upper end for salvaging indigo plant；Or/and the bus of anchor ring is set in circle
Arc, setting seat at anchor ring has the setting ball that can be sealed engagement therewith, and the diameter of setting ball is greater than the minimum diameter for setting anchor ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822218634.0U CN209687464U (en) | 2018-12-27 | 2018-12-27 | Jet-preventing tool in oil pipe under underbalance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822218634.0U CN209687464U (en) | 2018-12-27 | 2018-12-27 | Jet-preventing tool in oil pipe under underbalance |
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| Publication Number | Publication Date |
|---|---|
| CN209687464U true CN209687464U (en) | 2019-11-26 |
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ID=68597246
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822218634.0U Active CN209687464U (en) | 2018-12-27 | 2018-12-27 | Jet-preventing tool in oil pipe under underbalance |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109577912A (en) * | 2018-12-27 | 2019-04-05 | 中国石油集团西部钻探工程有限公司 | Jet-preventing tool and a formula underbalance combine oil production method in oil pipe under underbalance |
-
2018
- 2018-12-27 CN CN201822218634.0U patent/CN209687464U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109577912A (en) * | 2018-12-27 | 2019-04-05 | 中国石油集团西部钻探工程有限公司 | Jet-preventing tool and a formula underbalance combine oil production method in oil pipe under underbalance |
| CN109577912B (en) * | 2018-12-27 | 2024-03-01 | 中国石油天然气集团有限公司 | Blowout prevention tool in underbalanced lower oil pipe and one-pass underbalanced combined oil extraction method |
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