CN112145486A - Ejector device with variable nozzle cross-sectional area - Google Patents
Ejector device with variable nozzle cross-sectional area Download PDFInfo
- Publication number
- CN112145486A CN112145486A CN202010937628.XA CN202010937628A CN112145486A CN 112145486 A CN112145486 A CN 112145486A CN 202010937628 A CN202010937628 A CN 202010937628A CN 112145486 A CN112145486 A CN 112145486A
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- Prior art keywords
- ejector
- spherical shell
- shell
- aperture
- ball
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- 239000007788 liquid Substances 0.000 claims abstract description 10
- 238000009792 diffusion process Methods 0.000 claims description 3
- 238000011084 recovery Methods 0.000 description 6
- 239000010779 crude oil Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000003129 oil well Substances 0.000 description 4
- 239000003921 oil Substances 0.000 description 3
- 238000003912 environmental pollution Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
- F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
- F04F5/02—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being liquid
- F04F5/04—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being liquid displacing elastic fluids
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
- E21B43/121—Lifting well fluids
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
- F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
- F04F5/44—Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
- F04F5/46—Arrangements of nozzles
- F04F5/461—Adjustable nozzles
-
- 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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Jet Pumps And Other Pumps (AREA)
Abstract
An ejector device with a variable nozzle cross-sectional area comprises an ejector shell, wherein a through drainage channel is arranged in the ejector shell, and the drainage channel comprises a liquid inlet section, a variable cross-sectional area nozzle, a receiving chamber, a mixing chamber and a pressure expansion chamber which are sequentially connected; the ejector shell is also provided with a gas inlet section which is communicated with the receiving chamber; the variable cross-section area nozzle comprises an inlet section spherical shell, an aperture adjusting ball, an outlet section spherical shell and a fixed ball rod; the inside of the aperture adjusting ball is provided with a plurality of channels with different apertures along the horizontal diameter direction, the fixed ball rod is provided with a fixed aperture channel, the outside of the ejector shell is provided with an adjusting knob, the adjusting knob is connected with the aperture adjusting ball through a connecting rod, and the rotating adjusting knob can enable the channels with different apertures in the aperture adjusting ball to be communicated with the aperture channel. The cross-sectional area of the nozzle can be adjusted, the ejector is suitable for different working conditions, and the aim of improving the working efficiency of the ejector is fulfilled.
Description
Technical Field
The invention relates to an ejector device, in particular to an ejector device with a variable nozzle cross-sectional area.
Background
In the field of oil and gas well development, there are many process flows involving the conversion of wellhead pressure from low pressure to high pressure to low pressure. The low-pressure gas well cannot be effectively output due to too low wellhead pressure, and special equipment and a large amount of energy are required to meet the requirements of the production process; the high-pressure gas well can enter an output pipeline after throttling and pressure reduction so as to avoid the sinking of an oil well pump suction inlet caused by overhigh pressure, and the wellhead pressure is reduced by adopting a method of releasing casing gas regularly in actual production. This practice causes resource waste and environmental pollution. How to recover the discharged casing gas and provide the discharged casing gas for the wellhead to be pressurized has very important significance for reducing production energy consumption and improving energy utilization efficiency.
Most of the existing casing gas recovery devices at home and abroad have great requirements on working environment and need to use external energy. The ejector recovery device has the advantages of no need of external energy, convenience in operation and use, lower equipment processing price and the like, and the recovery cost can be greatly reduced. The traditional ejector geometric structure is fixed, the nozzle sectional area is determined at the beginning of design, and therefore the parameters of the outlet flow of the ejector cannot be adjusted. Under the working condition of design, this kind of form ejector can reach highest work efficiency, but changes when working condition, and the work efficiency of ejector will descend, even can not normally work.
Disclosure of Invention
In order to solve the problems, the invention provides the ejector device with the variable nozzle cross-sectional area, so that the cross-sectional area of the ejector device can be adjusted under different working conditions, the aim of improving the working efficiency of the ejector is fulfilled, and the recovery efficiency of casing gas is improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
the ejector device with the variable nozzle cross-sectional area comprises an ejector shell, wherein a through drainage channel is arranged in the ejector shell, and the drainage channel comprises a liquid inlet section, a nozzle with the variable cross-sectional area, a receiving chamber, a mixing chamber and a pressure expansion chamber which are sequentially connected; the ejector shell is also provided with a gas inlet section which is communicated with the receiving chamber;
the variable cross-sectional area nozzle comprises an inlet section spherical shell, an aperture adjusting ball, an outlet section spherical shell and a fixed ball rod; the fixed ball rod is nested in the aperture adjusting ball, and the aperture adjusting ball and the fixed ball rod are contained in the spherical shell of the inlet section and the spherical shell of the outlet section to form a nozzle main body together;
a plurality of channels with different calibers are arranged in the aperture adjusting ball along the horizontal diameter direction, a fixed caliber channel is arranged in the fixed ball arm, and the caliber channel and the drainage channel are on the same axis;
the ejector shell is externally provided with an adjusting knob, the adjusting knob is connected with the aperture adjusting ball through a connecting rod, and different aperture channels in the aperture adjusting ball can be communicated with the aperture channel by rotating the adjusting knob.
Further, a spherical shell inlet is arranged on the spherical shell of the inlet section and is communicated with the liquid inlet section; a spherical shell outlet is formed in the spherical shell of the outlet section and communicated with the receiving chamber; the inlet of the spherical shell, the outlet of the spherical shell and the caliber channel are coaxial.
Furthermore, the mixing chamber is in a circular truncated cone shape, and the radial diameter of the mixing chamber is gradually reduced along the flow direction; the pressure-expanding chamber is in a circular truncated cone shape, and the radial diameter flow is gradually enlarged along the radial direction.
Furthermore, the connecting rod is connected with a rotary button on the side of the ejector shell through mounting holes in the inlet section spherical shell and the outlet section spherical shell.
The invention has the beneficial effects that:
the invention can change the nozzle aperture of the ejector, so that the ejector can efficiently recover the sleeve gas under different working conditions; the device can effectively solve the problem of recovering the casing gas of the oil well under the condition of no external energy, realize the high-efficiency recovery of the casing gas, solve the gas lock phenomenon, improve the yield of the oil well, and reduce the environmental pollution and the resource waste caused by the emptying or ignition treatment of the casing gas.
Drawings
FIG. 1 is a schematic cross-sectional view of an eductor assembly with a variable nozzle cross-sectional area according to the present invention, with the direction of the arrows showing the direction of fluid flow.
Fig. 2 is an enlarged view of a portion of the variable cross-sectional area nozzle of the eductor of fig. 1.
FIG. 3 is a schematic cross-sectional view of an eductor variable cross-sectional area nozzle.
FIG. 4 is a schematic cross-sectional view of the eductor variable cross-sectional area nozzle with the adjustment knob and connecting rod outside the housing.
FIG. 5 is a schematic view of a quarter section of the injector nozzle portion.
Wherein: the device comprises an ejector shell 1, a drainage channel 2, a liquid inlet section 3, a gas inlet section 4, a receiving chamber 5, a mixing chamber 6, a diffusion chamber 7, a variable cross-sectional area nozzle 8, a nozzle main body 9, an inlet section spherical shell 10, a spherical shell inlet 10.1, an aperture adjusting ball 11, an outlet section spherical shell 12, a spherical shell outlet 12.1, a fixed small ball rod 13, an adjusting knob 14, a connecting rod 15, a channel 16, an aperture channel 17 and a mounting hole 18.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
As shown in fig. 1, an ejector device with a variable nozzle cross-sectional area comprises an ejector shell 1, wherein a through flow guide channel 2 is arranged in the ejector shell 1, and the flow guide channel 2 comprises a liquid inlet section 3, a variable cross-sectional area nozzle 8, a receiving chamber 5, a mixing chamber 6 and a diffusion chamber 7 which are connected in sequence; the ejector shell 1 is further provided with a gas inlet section 4, and the gas inlet section 4 is communicated with the receiving chamber 5. The mixing chamber 6 is in a circular truncated cone shape, and the radial diameter of the mixing chamber gradually decreases along the flow direction; the pressure expansion chamber 7 is in a circular truncated cone shape, and the radial diameter flow is gradually increased along the radial direction.
As shown in fig. 2 to 3, the variable cross-sectional area nozzle 8 includes an inlet section spherical shell 10, an aperture adjusting ball 11, an outlet section spherical shell 12, and a fixed ball arm 13; the fixed ball bar 13 is nested in the aperture adjusting ball 11, and the inlet section ball shell 10 and the outlet section ball shell 12 contain the aperture adjusting ball 11 and the fixed ball bar 13 to form the nozzle body 9.
A plurality of channels 16 with different calibers are arranged in the aperture adjusting ball 11 along the horizontal diameter direction, a fixed caliber channel 17 is arranged in the fixed ball arm 13, and the caliber channel 17 and the drainage channel 2 are on the same axis.
The inlet section spherical shell 10 is provided with a spherical shell inlet 10.1, and the spherical shell inlet 10.1 is communicated with the liquid inlet section 3; a spherical shell outlet 12.1 is arranged on the spherical shell 12 of the outlet section, and the spherical shell outlet 12.1 is communicated with the receiving chamber 5; the spherical shell inlet 10.1 and the spherical shell outlet 12.1 are coaxial with the caliber channel 17.
As shown in fig. 4 to 5, an adjusting knob 14 is arranged outside the ejector shell 1, the adjusting knob 14 is connected with the aperture adjusting ball 11 through a connecting rod 15, and the aperture adjusting ball 11 is communicated with the aperture channels 17 through rotating the adjusting knob 14.
The connecting rod 15 is connected with a rotary button 14 on the side of the ejector shell 1 through mounting holes 18 on the inlet section spherical shell 10 and the outlet section spherical shell 12.
The invention provides an ejector device with a variable nozzle section area, which is used for recovering casing gas in oil field production, and the working principle of the ejector device is described by combining the accompanying drawings:
as shown in fig. 1, in the working state, crude oil produced by an oil well flows out of an oil pipeline, enters the device through the liquid inlet section 3, flows through the working nozzle 8 to reach the receiving chamber 5, pressure energy is converted into speed energy, the pressure of the drainage channel 2 is reduced at the moment, a vacuum negative pressure cavity is formed around the nozzle 8, injected gas, namely casing gas enters the mixing chamber 6 from the gas inlet section 4 to be mixed with the crude oil, then enters the pressure expansion chamber 7, the crude oil and the casing gas reach a stable flowing state after mixed pressure expansion of the pressure expansion chamber 7, and then enter the pipeline for transportation and recycling.
The method of changing the nozzle cross-sectional area is described below:
as shown in fig. 2 to 5, the cross-sectional area of the variable cross-sectional area nozzle 8 can be changed by adjusting the knob 14, rotating the adjusting knob 14 drives the connecting rod 15 and the aperture adjusting ball 11 inside the housing to rotate, so that the channel 16 inside the aperture adjusting ball 11 and the aperture channel 17 of the fixed ball rod 13 are on the same axis, and the variable cross-sectional area nozzle 8 is communicated with the liquid inlet section 3 and the mixing chamber 5 to form a crude oil circulation channel.
The channel 16 with different calibers and the channel 17 with different calibers are adjusted on the same axis, the diameter of the channel in the nozzle is changed, and the function of changing the cross-sectional area of the nozzle is achieved. The cross section area of the nozzle can be changed to change the working parameters such as the vacuum negative pressure at the mixing chamber 5, the outlet flow and the like, so that the ejector can reach the optimal working state under different pressure conditions, and the recovery efficiency of the sleeve gas is improved.
Details not described in this specification are within the skill of the art that are well known to those skilled in the art.
Claims (4)
1. The utility model provides a changeable ejector device of nozzle cross sectional area which characterized in that: the jet type mixing device comprises an ejector shell (1), wherein a through drainage channel (2) is arranged in the ejector shell (1), and the drainage channel (2) comprises a liquid inlet section (3), a nozzle (8) with a variable cross-sectional area, a receiving chamber (5), a mixing chamber (6) and a diffusion chamber (7) which are sequentially connected; the ejector shell (1) is also provided with a gas inlet section (4), and the gas inlet section (4) is communicated with the receiving chamber (5);
the variable cross-section area nozzle (8) comprises an inlet section spherical shell (10), an aperture adjusting ball (11), an outlet section spherical shell (12) and a fixed ball rod (13); the fixed ball arm (13) is nested in the aperture adjusting ball (11), and the aperture adjusting ball (11) and the fixed ball arm (13) are contained in the inlet section spherical shell (10) and the outlet section spherical shell (12) to form a nozzle main body (9) together;
a plurality of channels (16) with different calibers are arranged in the aperture adjusting ball (11) along the horizontal diameter direction, a fixed caliber channel (17) is arranged in the fixed ball arm (13), and the caliber channel (17) and the drainage channel (2) are on the same axis;
an adjusting knob (14) is arranged outside the ejector shell (1), the adjusting knob (14) is connected with the aperture adjusting ball (11) through a connecting rod (15), and different aperture channels (16) in the aperture adjusting ball (11) can be communicated with the aperture channel (17) by rotating the adjusting knob (14).
2. The ejector device of claim 1, wherein: a spherical shell inlet (10.1) is arranged on the spherical shell (10) of the inlet section, and the spherical shell inlet (10.1) is communicated with the liquid inlet section (3); a spherical shell outlet (12.1) is formed in the spherical shell (12) of the outlet section, and the spherical shell outlet (12.1) is communicated with the receiving chamber (5); the spherical shell inlet (10.1) and the spherical shell outlet (12.1) are coaxial with the caliber channel (17).
3. The ejector device of claim 1, wherein: the mixing chamber (6) is in a circular truncated cone shape, and the radial diameter of the mixing chamber is gradually reduced along the flow direction; the pressure expansion chamber (7) is in a circular truncated cone shape, and the radial diameter flow is gradually increased along the radial direction.
4. The ejector device of claim 1, wherein: the connecting rod (15) is connected with a rotary button (14) on the side of the ejector shell (1) through mounting holes (18) on the inlet section spherical shell (10) and the outlet section spherical shell (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010937628.XA CN112145486B (en) | 2020-09-07 | 2020-09-07 | Ejector device with variable nozzle cross-sectional area |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010937628.XA CN112145486B (en) | 2020-09-07 | 2020-09-07 | Ejector device with variable nozzle cross-sectional area |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112145486A true CN112145486A (en) | 2020-12-29 |
| CN112145486B CN112145486B (en) | 2022-08-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010937628.XA Active CN112145486B (en) | 2020-09-07 | 2020-09-07 | Ejector device with variable nozzle cross-sectional area |
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| Country | Link |
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| CN (1) | CN112145486B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112780614A (en) * | 2021-02-18 | 2021-05-11 | 哈尔滨工程大学 | Hydrogen ejector for fuel cell with adjustable flow |
| CN112943710A (en) * | 2021-02-18 | 2021-06-11 | 哈尔滨工程大学 | A wide type ejector for hydrogen fuel cell circulation system |
| CN115467862A (en) * | 2022-10-14 | 2022-12-13 | 国家电投集团氢能科技发展有限公司 | Mixing chamber adjustable ejector and fuel cell |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050092002A1 (en) * | 2000-09-14 | 2005-05-05 | Wightman David A. | Expansion valves, expansion device assemblies, vapor compression systems, vehicles, and methods for using vapor compression systems |
| US20050127317A1 (en) * | 2003-12-11 | 2005-06-16 | Rebello Peter J. | Metering ball valve and method of determining fluid flow therethrough |
| CN104535122A (en) * | 2014-12-31 | 2015-04-22 | 西安交通大学 | Critical flow venturi nozzle with throat inserting plate and with adjustable throat area |
| CN204386959U (en) * | 2014-09-29 | 2015-06-10 | 江苏大学 | A kind of area ratio adjustable jet pump |
| CN208390271U (en) * | 2018-04-24 | 2019-01-18 | 无锡沃得旋转雾化科技有限公司 | A kind of atomizer of adjustable atomized liquid flow |
| CN209663541U (en) * | 2019-03-14 | 2019-11-22 | 洛阳帝博石化装备有限公司 | A kind of spherical surface nozzle |
| CN209752647U (en) * | 2019-02-26 | 2019-12-10 | 江苏沃泰冶金设备有限公司 | Rotary jet mixer |
-
2020
- 2020-09-07 CN CN202010937628.XA patent/CN112145486B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050092002A1 (en) * | 2000-09-14 | 2005-05-05 | Wightman David A. | Expansion valves, expansion device assemblies, vapor compression systems, vehicles, and methods for using vapor compression systems |
| US20050127317A1 (en) * | 2003-12-11 | 2005-06-16 | Rebello Peter J. | Metering ball valve and method of determining fluid flow therethrough |
| CN204386959U (en) * | 2014-09-29 | 2015-06-10 | 江苏大学 | A kind of area ratio adjustable jet pump |
| CN104535122A (en) * | 2014-12-31 | 2015-04-22 | 西安交通大学 | Critical flow venturi nozzle with throat inserting plate and with adjustable throat area |
| CN208390271U (en) * | 2018-04-24 | 2019-01-18 | 无锡沃得旋转雾化科技有限公司 | A kind of atomizer of adjustable atomized liquid flow |
| CN209752647U (en) * | 2019-02-26 | 2019-12-10 | 江苏沃泰冶金设备有限公司 | Rotary jet mixer |
| CN209663541U (en) * | 2019-03-14 | 2019-11-22 | 洛阳帝博石化装备有限公司 | A kind of spherical surface nozzle |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112780614A (en) * | 2021-02-18 | 2021-05-11 | 哈尔滨工程大学 | Hydrogen ejector for fuel cell with adjustable flow |
| CN112943710A (en) * | 2021-02-18 | 2021-06-11 | 哈尔滨工程大学 | A wide type ejector for hydrogen fuel cell circulation system |
| CN112780614B (en) * | 2021-02-18 | 2022-08-02 | 哈尔滨工程大学 | Hydrogen ejector for flow-adjustable fuel cell |
| CN112943710B (en) * | 2021-02-18 | 2022-08-02 | 哈尔滨工程大学 | A Broad Ejector for Hydrogen Fuel Cell Circulation System |
| CN115467862A (en) * | 2022-10-14 | 2022-12-13 | 国家电投集团氢能科技发展有限公司 | Mixing chamber adjustable ejector and fuel cell |
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| Publication number | Publication date |
|---|---|
| CN112145486B (en) | 2022-08-19 |
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