CN109736746A - One kind can automatically adjust blowout oil nozzle structure and method - Google Patents
One kind can automatically adjust blowout oil nozzle structure and method Download PDFInfo
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- CN109736746A CN109736746A CN201910006519.3A CN201910006519A CN109736746A CN 109736746 A CN109736746 A CN 109736746A CN 201910006519 A CN201910006519 A CN 201910006519A CN 109736746 A CN109736746 A CN 109736746A
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- oil nozzle
- blowout oil
- blowout
- gas chamber
- bellows
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Abstract
The present invention relates to one kind can automatically adjust blowout oil nozzle structure and method comprising blowout oil nozzle cavity, blowout oil nozzle chamber inlet end are provided with the blowout oil nozzle, are provided with the gas chamber in the blowout oil nozzle cavity；The gas chamber open end is connect with described bellows one end, and the bellows other end is provided with the baffle, and the bellows and the gas chamber are located on same axis；Described connecting rod one end is connect with the spool, and the spool is located at the inside of the blowout oil nozzle import, connect at the connecting rod other end and the baffle center position, and the gas chamber, bellows, connecting rod, spool are on same axis.The present invention can reach during oil/gas well open flow without the operation for carrying out replacement oil nozzle, reduce the activity duration, accelerate testing progress, reduce stratum excitement, well is enable to put into production faster；It can be applied in oil and gas exploitation field extensively.
Description
Technical field
The present invention relates to a kind of oil and gas exploitation fields, can automatically adjust blowout oil nozzle structure especially with regard to one kind
And method.
Background technique
In order to which the hydrops or impurity that are discharged around pit shaft and shaft bottom need to carry out open flow test before gas well liquid loading, but
Since the dense fluids in well are constantly discharged during open flow, well head pressure can be continuous with the carry out for being drained through journey is returned
It increases.It is drained through Cheng Dangzhong returning and needs to reach by using the method for throttling the pressure of control discharge fluid and the mesh of flow
's.But the oil nozzle that scene uses all is generally fixed mouth diameter, during the row of returning when well head pressure reaches a certain level
It needs first to pour into and can just continue test jobs after adjustable bean.Pouring into adjustable bean will affect test process, generate ground
Layer excitement and the possibility for increasing pit shaft gas hydrate synthesis.At present both at home and abroad about the blowout oil nozzle in open flow throttling process
Study it is relatively fewer, not can according to well head pressure automatically adjust size blowout oil nozzle.
Summary of the invention
For flow nipple size during open flow according to the self-adjustable requirement of well head oil pressure, the purpose of the present invention is mention
Blowout oil nozzle structure and method can be automatically adjusted for one kind, can be reached during oil/gas well open flow without carrying out replacement oil nozzle
Operation, reduce the activity duration, accelerate testing progress, reduce stratum excitement, so that well is put into production faster.
To achieve the above object, the present invention takes following technical scheme: one kind can automatically adjust blowout oil nozzle structure, packet
Include blowout oil nozzle cavity, blowout oil nozzle, gas chamber, bellows, baffle, connecting rod and spool；Blowout oil nozzle chamber inlet end
It is provided with the blowout oil nozzle, is provided with the gas chamber in the blowout oil nozzle cavity；The gas chamber open end and the ripple
The connection of pipe one end, the bellows other end are provided with the baffle, and the bellows and the gas chamber are located on same axis；
Described connecting rod one end is connect with the spool, and the spool is located at the inside of the blowout oil nozzle import, and the connecting rod is another
It is connect at one end and the baffle center position, the gas chamber, bellows, connecting rod, spool are on same axis.
Further, the gas chamber is hollow cylinder shape structure, and one end is completely enclosed state, and the other end is the opening
End.
Further, it is provided on the side wall at blowout oil nozzle chamber inlet end for showing that the blowout oil nozzle is opened
The aperture table of degree.
Further, the gas chamber is fixedly connected by several fixed links with the inner wall of the blowout oil nozzle cavity.
Further, the gas chamber top is provided with injecting hole；Described injecting hole one end is connected to the gas chamber, and the other end is worn
The wall surface for crossing the blowout oil nozzle cavity is the entrance of the injecting hole at the blowout oil nozzle cavity wall surface, enters at this
Seal head is provided at mouthful.
Further, the injecting hole is a tubule, after carrying out aperture on the gas chamber and the blowout oil nozzle cavity,
The injecting hole both ends are welded with the gas chamber and blowout oil nozzle cavity respectively.
Further, the bellows uses metal bellows；The baffle uses a circular metal plate, with the bellows
It is welded and fixed.
Further, the spool is a conical structure；The blowout oil nozzle is a cylindrical structure, is provided centrally with
The import, the import are the circular hole of a predetermined size；In the blowout oil nozzle excircle and the blowout oil nozzle cavity
Sidewall weld is fixed.
Further, the blowout oil nozzle cavity is a cylindrical structure, and arrival end lateral wall is provided with external screw thread, is exported
End inner sidewall is provided with internal screw thread.
A kind of adjusting implementation method for automatically adjusting blowout oil nozzle based on above-mentioned blowout oil nozzle structure comprising automatic
Adjust implementation method, valve position implementation method and human intervention implementation method:
(1) it automatically adjusts implementation method: causing spool stress to change when well head pressure changes, so that ripple
Pipe is subjected to displacement in the axial direction, realizes that the effect of adjusting spool position utilizes spool when corresponding change occurs for spool position
Have the characteristics that taper realizes the inlet size for adjusting blowout oil nozzle；
(2) valve position implementation method: by the relationship of corresponding air chamber pressure, bellows coefficient of elasticity and inlet pressure
It is organized in aperture table, when air chamber pressure changes, Xiang Kaidu table imports corresponding relational implementation and converts inlet pressure to
The aperture of corresponding blowout oil nozzle shows the aperture of corresponding blowout oil nozzle when well head pressure changes in order to carry out
The record of open flow test data；
(3) human intervention implementation method: there is exception in the registration of aperture table, registration is more than given maximum open flow oil
When the aperture of mouth, indicates that well head pressure is more than estimated maximum pressure value, need to carry out corresponding manual intervention, closing well is needed to stop
Open flow operation increases the operating condition that air chamber pressure changes blowout oil nozzle by injecting hole to gas chamber gas injection, to reach open flow work
The requirement of industry；When the registration of aperture table is too low, indicates that well head pressure is too low, need to carry out phase if being unable to satisfy open flow requirement
The manual intervention answered needs closing well to stop open flow operation, carries out pressure release processing to gas chamber by injecting hole, changes blowout oil nozzle
Operating condition, to reach the requirement of open flow operation.
The invention adopts the above technical scheme, which has the following advantages: 1, the present invention can be realized and ground tubing string
Good connection, air chamber pressure and ripple tube cofficients can be determined according to different bottom pressures, can be used in various pressure
Gas well.2, the present invention can automatically adjust the aperture of oil nozzle according to the size of well head pressure, and be shown, can be very big
The workload of scene replacement oil nozzle is reduced in degree.3, the present invention can carry out accordingly in well head pressure range more than expected
Human intervention is to meet the requirement of open flow operation.4, the present invention can automatically adjust oil nozzle according to the variation of well head pressure when open flow
Mouth diameter.5, being directed to used oil nozzle at present is generally fixed mouth diameter, is needed during carrying out open flow test constantly more
It changes oil mouth, the problem of to meet open flow requirement, the present invention can be realized the aperture that oil nozzle is automatically adjusted according to well head pressure；This hair
Bright structure is simple, can be realized the good connection with ground tubing string, can be determined according to different bottom pressures air chamber pressure and
Ripple tube cofficients can be used in the gas well of various pressure.6, the present invention can automatically adjust oil according to the size of well head pressure
The aperture of mouth, and shown, it can largely reduce the workload of scene replacement oil nozzle.7, the present invention can be in well
Corresponding human intervention is carried out when mouthful pressure range more than expected to meet the requirement of open flow operation.
Detailed description of the invention
Fig. 1 is overall structure diagram of the invention；
Fig. 2 is the right view of Fig. 1.
Specific embodiment
In the description of the present invention, it is to be understood that, the orientation or position of the instructions such as term " on ", "lower" "inner", "outside"
Setting relationship is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of description of the present invention and simplification of the description, rather than
The device or element of indication or suggestion meaning must have a particular orientation, be constructed and operated in a specific orientation, therefore cannot
It is interpreted as limitation of the present invention.The present invention is described in detail below with reference to the accompanying drawings and embodiments.
As shown in Figure 1, the present invention, which provides one kind, can automatically adjust blowout oil nozzle structure comprising blowout oil nozzle cavity 1 is put
Atomizer 2, gas chamber 3, bellows 4, baffle 5, connecting rod 6 and spool 7.
1 arrival end of blowout oil nozzle cavity is provided with blowout oil nozzle 2, and gas chamber 3 is provided in blowout oil nozzle cavity 1.Gas chamber 3 is opened
Mouth end is connect with 4 one end of bellows, and 4 other end of bellows is provided with baffle 5；Bellows 4 and gas chamber 3 are located on same axis.
6 one end of connecting rod is connect with spool 7, and spool 7 is located at the inside of 2 import of blowout oil nozzle；6 other end of connecting rod and 5 center of baffle
It is connected at position, and gas chamber 3, bellows 4, connecting rod 6, spool 7 is on same axis.
In a preferred embodiment, gas chamber 3 is hollow cylinder shape structure, and one end is completely enclosed state, another
End is open end.In use, can determine gas chamber 3 according to the cracking pressure and maximum well head pressure value of blowout oil nozzle 2
Pressure.
In a preferred embodiment, aperture table 8 is provided on the side wall of 1 arrival end of blowout oil nozzle cavity.It should
Aperture table 8 is a repacking pressure gauge, for being shown in the aperture of blowout oil nozzle 2 under corresponding operating condition.
In a preferred embodiment, as shown in Figure 1 and Figure 2, gas chamber 3 passes through several fixed links 9 and blowout oil nozzle cavity
1 inner wall is fixedly connected, the setting of several intervals of fixed link 9.Fixed link 9 needs to match with blowout oil nozzle cavity 1 and gas chamber 3
It closes, so that after being welded to connect fixed link 9 and blowout oil nozzle cavity 1 and gas chamber 3, gas chamber 3 and blowout oil nozzle cavity 1
On same axis, and play fixation.
In a preferred embodiment, 3 top of gas chamber is additionally provided with injecting hole 10.10 one end of injecting hole and gas chamber 3 connect
Logical, the other end passes through the wall surface of blowout oil nozzle cavity 1, is the entrance of injecting hole 10 at 1 wall surface of blowout oil nozzle cavity, at this
Inlet is provided with seal head 11.Seal head 11 needs to be cooperated with the entrance of injecting hole 10, is realized and is infused by seal head 11
The sealing of stomata 10 and gas chamber 3.
In above-described embodiment, injecting hole 10 is a tubule, will after progress aperture on gas chamber 3 and blowout oil nozzle cavity 1
Its both ends is welded with gas chamber 3 and blowout oil nozzle cavity 1 respectively and (needs to reach good sealing), using close after gas injection
End socket 11 is sealed it.
In the various embodiments described above, bellows 4 uses metal bellows.Baffle 5 uses a circular metal plate, with bellows 4
It is welded and fixed, bellows 4 needs to reach good leakproofness when connecting with gas chamber 3 and baffle 5.
In the various embodiments described above, spool 7 is a conical structure, needs to carry out corresponding wear-resistant, erosion resistance processing.
In the various embodiments described above, blowout oil nozzle 2 is a cylindrical structure, is provided centrally with import, which is one pre-
The circular hole being first sized needs to carry out corresponding wear-resistant, erosion resistance processing；2 excircle of blowout oil nozzle and blowout oil nozzle chamber
1 inner sidewall of body is welded and fixed, and is on same axis with preventer cavity 1.
In a preferred embodiment, blowout oil nozzle cavity 1 is a cylindrical structure, and arrival end lateral wall is provided with
External screw thread 12, outlet end inner sidewall is provided with internal screw thread 13, and then is conveniently attached with surface line.
Blowout oil nozzle structure is automatically adjusted based on above-mentioned, the present invention also provides the tune that one kind can automatically adjust blowout oil nozzle
Implementation method is saved, which includes automatic adjustment implementation method, valve position implementation method and human intervention implementation method:
(1) it automatically adjusts implementation method: causing 7 stress of spool to change when well head pressure changes, so that wave
Line pipe 4 is subjected to displacement in the axial direction, realizes the effect of 7 position of adjusting spool, when corresponding change occurs for 7 position of spool, benefit
Has the characteristics that the inlet size that taper realizes adjusting blowout oil nozzle 2 with spool 7；
(2) valve position implementation method: valve position is the aperture table 8 made of being reequiped to pressure gauge, will be right
The relationship of 3 pressure of gas chamber, 4 coefficient of elasticity of bellows and the inlet pressure answered is organized in aperture table 8, is changed in 3 pressure of gas chamber
When change, Xiang Kaidu table 8 imports the aperture that corresponding relational implementation converts inlet pressure to corresponding blowout oil nozzle 2, in well
Mouth pressure shows the aperture of corresponding blowout oil nozzle 2 when changing in order to carry out the record of open flow test data；
Wherein, it according to the relationship of 3 pressure of gas chamber, 4 coefficient of elasticity of bellows and inlet pressure, determines well head pressure and puts
The relational approach of 2 aperture of atomizer are as follows:
Start with from annular gap stream formula, obtain corresponding inlet pressure, corresponding bellows is determined by bellows characteristic
Coefficient of elasticity, according to recklessly can law determine bellows elastic reaction generate power, obtained using the equation of gas state corresponding
Air chamber pressure variation；Thus relational expression between well head pressure to the end and open flow throttling oil nozzle aperture is as follows:
In formula, η is the aperture of blowout oil nozzle, dimensionless；d1For blowout oil nozzle maximum gauge, mm；C is the taper of spool,
Dimensionless；P1For inlet pressure, MPa；V1For initial chamber volume；mm3；X is the deflection of bellows, mm；P3For gas chamber pressure
Power, MPa；K is bellows coefficient of elasticity, N/mm；P2For outlet pressure, MPa；d2For spool basal diameter, mm；d3It is straight for baffle
Diameter, mm；PwhFor well head pressure, MPa；μ is dynamic viscosity, mpas；L is insertion depth, L=(d2/C-x)mm；Q is discharge capacity,
m3/s；DRFor a clearance flow central diameter, DR=(D+d)/2, mm；D is annulus outer diameter in annular gap stream, mm；D is in annular gap stream
Internal radius, mm；δ is gap amount, δ=(D-d)/2, mm；E is the elasticity modulus of bellows material, MPa；d4、d5Respectively wave
The inside and outside diameter of line pipe, mm；N is ripple number, dimensionless；T is bellows wall thickness, mm；H is bellows ditch depth, mm；R is average half
Diameter, R=(d4+d5)/2, mm；f(P1, x) and it is inlet pressure and bellows deflection functional relation；A is bellows useful area
Product, mm2。
(3) human intervention implementation method: there is exception in the registration of aperture table 8, registration is more than given maximum open flow
When the aperture of oil nozzle 2, indicates that well head pressure is more than estimated maximum pressure value, need to carry out corresponding manual intervention, need closing well
Stop open flow operation, by injecting hole 10 to 3 gas injection of gas chamber, increases the operating condition of 3 pressure change blowout oil nozzle 2 of gas chamber, with
Reach the requirement of open flow operation；When the registration of aperture table 8 is too low, indicates that well head pressure is too low, wanted if being unable to satisfy open flow
It asks and needs to carry out corresponding manual intervention, closing well is needed to stop open flow operation, gas chamber 3 is carried out at pressure release by injecting hole 10
Reason changes the operating condition of blowout oil nozzle 2, to reach the requirement of open flow operation.
The various embodiments described above are merely to illustrate the present invention, and structure and size, setting position and the shape of each component are all can be with
It is varied, based on the technical solution of the present invention, the improvement and wait that all principles according to the present invention carry out individual part
With transformation, should not exclude except protection scope of the present invention.
Claims (10)
1. one kind can automatically adjust blowout oil nozzle structure, it is characterised in that: including blowout oil nozzle cavity, blowout oil nozzle, gas chamber, wave
Line pipe, baffle, connecting rod and spool；Blowout oil nozzle chamber inlet end is provided with the blowout oil nozzle, the blowout oil nozzle
The gas chamber is provided in cavity；The gas chamber open end is connect with described bellows one end, the bellows other end setting
There is the baffle, the bellows and the gas chamber are located on same axis；Described connecting rod one end is connect with the spool, institute
The inside that spool is located at the blowout oil nozzle import is stated, is connect at the connecting rod other end and the baffle center position, institute
Gas chamber, bellows, connecting rod, spool is stated to be on same axis.
2. blowout oil nozzle structure as described in claim 1, it is characterised in that: the gas chamber is hollow cylinder shape structure, one end
To completely enclose state, the other end is the open end.
3. blowout oil nozzle structure as described in claim 1, it is characterised in that: the side wall positioned at blowout oil nozzle chamber inlet end
On be provided with aperture table for showing the blowout oil nozzle aperture.
4. blowout oil nozzle structure as described in claim 1, it is characterised in that: the gas chamber passes through several fixed links and the open flow
The inner wall of oil nozzle cavity is fixedly connected.
5. blowout oil nozzle structure as described in claim 1, it is characterised in that: the gas chamber top is provided with injecting hole；The note
Stomata one end is connected to the gas chamber, and the other end passes through the wall surface of the blowout oil nozzle cavity, is located at the blowout oil nozzle cavity
It is the entrance of the injecting hole at wall surface, the inlet is provided with seal head.
6. blowout oil nozzle structure as claimed in claim 5, it is characterised in that: the injecting hole be a tubule, the gas chamber with
And after on the blowout oil nozzle cavity carrying out aperture, by the injecting hole both ends respectively with the gas chamber and blowout oil nozzle cavity into
Row welding.
7. blowout oil nozzle structure as described in claim 1, it is characterised in that: the bellows uses metal bellows；The gear
Plate uses a circular metal plate, is welded and fixed with the bellows.
8. blowout oil nozzle structure as described in claim 1, it is characterised in that: the spool is a conical structure；The open flow
Oil nozzle is a cylindrical structure, is provided centrally with the import, which is the circular hole of a predetermined size；The open flow
Oil nozzle excircle is welded and fixed with the blowout oil nozzle cavity inner wall.
9. blowout oil nozzle structure as described in claim 1, it is characterised in that: the blowout oil nozzle cavity is a cylindrical structure,
Its arrival end lateral wall is provided with external screw thread, and outlet end inner sidewall is provided with internal screw thread.
10. a kind of adjusting for automatically adjusting blowout oil nozzle based on the blowout oil nozzle structure as described in any one of claim 1 to 9
Implementation method, which is characterized in that including automatic adjustment implementation method, valve position implementation method and human intervention implementation method:
(1) it automatically adjusts implementation method: causing spool stress to change when well head pressure changes, so that bellows edge
Axis direction is subjected to displacement, and realizes that the effect of adjusting spool position has when corresponding change occurs for spool position using spool
The characteristics of taper, realizes the inlet size for adjusting blowout oil nozzle；
(2) valve position implementation method: the relationship of corresponding air chamber pressure, bellows coefficient of elasticity and inlet pressure is worked out
In aperture table, when air chamber pressure changes, Xiang Kaidu table imports corresponding relational implementation and converts correspondence for inlet pressure
Blowout oil nozzle aperture, the aperture of corresponding blowout oil nozzle is shown when well head pressure changes in order to carry out open flow
The record of test data；
(3) human intervention implementation method: there is exception in the registration of aperture table, registration is more than given maximum blowout oil nozzle
When aperture, indicates that well head pressure is more than estimated maximum pressure value, need to carry out corresponding manual intervention, closing well is needed to stop open flow
Operation increases the operating condition that air chamber pressure changes blowout oil nozzle, by injecting hole to gas chamber gas injection to reach open flow operation
It is required that；It when the registration of aperture table is too low, indicates that well head pressure is too low, needs to carry out accordingly if being unable to satisfy open flow requirement
Manual intervention needs closing well to stop open flow operation, carries out pressure release processing to gas chamber by injecting hole, changes the work of blowout oil nozzle
Condition, to reach the requirement of open flow operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910006519.3A CN109736746A (en) | 2019-01-04 | 2019-01-04 | One kind can automatically adjust blowout oil nozzle structure and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910006519.3A CN109736746A (en) | 2019-01-04 | 2019-01-04 | One kind can automatically adjust blowout oil nozzle structure and method |
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| CN109736746A true CN109736746A (en) | 2019-05-10 |
Family
ID=66363352
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| CN201910006519.3A Pending CN109736746A (en) | 2019-01-04 | 2019-01-04 | One kind can automatically adjust blowout oil nozzle structure and method |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2096586C1 (en) * | 1996-01-29 | 1997-11-20 | Акционерное общество закрытого типа "Лифт Ойл" | Valving device for bore-holes |
| US20100155079A1 (en) * | 2007-06-05 | 2010-06-24 | Petroleum Technology Company As | Bellows valve |
| US20110067879A1 (en) * | 2008-03-13 | 2011-03-24 | Petroleum Technology Company As | Bellows Valve |
| CN202039813U (en) * | 2011-04-18 | 2011-11-16 | 北京九尊能源技术股份有限公司 | Needle valve |
| CN204371219U (en) * | 2014-12-04 | 2015-06-03 | 中国石油天然气股份有限公司 | A kind of mechanical compression display valve discharging gas under certain pressure |
| CN206246091U (en) * | 2016-12-13 | 2017-06-13 | 新疆熙泰石油装备有限公司 | Pneumatic continuous adjustable oil nozzle valve |
| CN108825167A (en) * | 2018-06-25 | 2018-11-16 | 西南石油大学 | A kind of automatic adjustment can throttling set and method under sand proof well |
-
2019
- 2019-01-04 CN CN201910006519.3A patent/CN109736746A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2096586C1 (en) * | 1996-01-29 | 1997-11-20 | Акционерное общество закрытого типа "Лифт Ойл" | Valving device for bore-holes |
| US20100155079A1 (en) * | 2007-06-05 | 2010-06-24 | Petroleum Technology Company As | Bellows valve |
| US20110067879A1 (en) * | 2008-03-13 | 2011-03-24 | Petroleum Technology Company As | Bellows Valve |
| CN202039813U (en) * | 2011-04-18 | 2011-11-16 | 北京九尊能源技术股份有限公司 | Needle valve |
| CN204371219U (en) * | 2014-12-04 | 2015-06-03 | 中国石油天然气股份有限公司 | A kind of mechanical compression display valve discharging gas under certain pressure |
| CN206246091U (en) * | 2016-12-13 | 2017-06-13 | 新疆熙泰石油装备有限公司 | Pneumatic continuous adjustable oil nozzle valve |
| CN108825167A (en) * | 2018-06-25 | 2018-11-16 | 西南石油大学 | A kind of automatic adjustment can throttling set and method under sand proof well |
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Application publication date: 20190510 |