CN107780906B - Constant flow water injection nozzle based on mechanical choking principle - Google Patents
Constant flow water injection nozzle based on mechanical choking principle Download PDFInfo
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- CN107780906B CN107780906B CN201711022568.3A CN201711022568A CN107780906B CN 107780906 B CN107780906 B CN 107780906B CN 201711022568 A CN201711022568 A CN 201711022568A CN 107780906 B CN107780906 B CN 107780906B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 60
- 238000002347 injection Methods 0.000 title claims abstract description 55
- 239000007924 injection Substances 0.000 title claims abstract description 55
- 239000011148 porous material Substances 0.000 claims abstract description 33
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 31
- 239000007921 spray Substances 0.000 claims abstract description 26
- 230000008602 contraction Effects 0.000 claims abstract description 9
- 239000012530 fluid Substances 0.000 claims abstract description 9
- 238000013461 design Methods 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 4
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 238000009826 distribution Methods 0.000 abstract description 5
- 238000010521 absorption reaction Methods 0.000 abstract description 4
- 238000011084 recovery Methods 0.000 abstract description 4
- 238000009434 installation Methods 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 13
- 239000010410 layer Substances 0.000 description 12
- 238000011161 development Methods 0.000 description 5
- 230000007547 defect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 239000002332 oil field water Substances 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 201000004569 Blindness Diseases 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004401 flow injection analysis Methods 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
Classifications
-
- 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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/20—Displacing by water
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Nozzles (AREA)
Abstract
The invention discloses a constant flow water injection spray pipe based on a mechanical choking principle, which comprises a spray pipe shell, wherein one end of an inner cavity of the spray pipe shell is provided with a nozzle, and the nozzle consists of a head contraction section and a throat straight pipe section which are sequentially connected; one end of the nozzle shell, which is positioned at the head contraction section, is provided with an upstream mounting pore plate, and the other end of the nozzle shell is provided with a downstream mounting pore plate; the inner cavity of the spray pipe shell is penetrated with a guide rod, and the central axis of the guide rod coincides with the central axis of the spray pipe shell; one end of the guide rod is in threaded connection with the central hole of the upstream mounting pore plate, and the other end of the guide rod is in threaded connection with the central hole of the downstream mounting pore plate; the guide rod is sleeved with a floater which spans the throat straight pipe section and is used for controlling the fluid flow. The invention has simple structure and convenient installation, can overcome the unbalance of water distribution caused by different water absorption capacities of each water injection well or oil layer, avoid over-injection or under-injection of water injection, realize fine separate water injection control of the oil field and improve recovery ratio.
Description
Technical Field
The invention relates to the technical field of fluid flow control, in particular to a constant flow water injection nozzle based on a mechanical choking principle.
Background
The main purpose of oilfield flooding is to maintain oilfield energy, maintain reservoir pressure and improve the liquid supply capacity of the oilfield so as to achieve the purpose of further exploiting petroleum, and is an important means for realizing high and stable yield of crude oil. Strengthening effective water injection is currently the key to improving the development effect of the oil field. Because of the difference of water absorption capacity and injection allocation requirements among the water injection wells, the flow of each water injection well needs to be controlled. In addition, the water flooding of China has strong heterogeneity of the reservoir, and the separate-layer water injection is an effective method for realizing high and stable yield and improving the development effect of the oil field. With the continuous deep development of oil fields, the problems of more complex water flooding development face injection and production relation, unbalanced oil layer utilization, aggravated interlayer contradiction and the like, and the problems of serious invalid water circulation, rapid water content rise, low reserve utilization degree and the like are caused.
The existing ground constant flow water injection valve group is mainly adjusted by a manual valve, an electric valve or a constant flow valve. The manual regulating valve needs an operator to regulate according to the injection amount of the water injection process by manually rotating a hand wheel and combining with the indication value of the flowmeter. The manual regulation valve has two main defects: on one hand, because the manual control has a time lag effect, abnormal conditions of water injection cannot be treated in time, particularly at night, operators cannot find and treat the abnormal conditions in time due to pressure fluctuation, so that the water injection quantity is out of control or anti-spitting 'back flow', and the stable development and the safe production of an oil field are seriously influenced; on the other hand, most of oilfield water injection pressure is between 10 and 40MPa, the oilfield water injection pressure belongs to a high-pressure dangerous environment, a common gate valve or a stop valve is easy to leak, and in practice, a plurality of unsafe factors exist, and the on-site manual adjustment is unsafe. The constant flow control system of the electric valve generally consists of a remote control valve, a flowmeter and a control unit (such as a microcomputer, etc.), wherein the microcomputer is required to monitor the measured flow of the flowmeter all the time in the working process, and the remote control valve is used for adjusting the flow when the flow deviates from the expected value range, so that the active flow control mechanism has complex and huge structure and is generally high in price. At present, the ground water injection constant flow valve has various forms, such as structures shown in patents CN200920198162.5, CN201320354603.2, CN200520079638.5, CN201220058772.7 and the like, but the problems of complex structure, huge volume, high cost, inconvenience in maintenance and the like exist in common.
The existing underground separate-layer water injection mainly adopts a fixed water nozzle blanking plug or a constant flow blanking plug. The fixed water nozzle plug has blindness in flow rate adjustment, has low control degree on the water injection quantity, and is easy to cause unbalance of the water injection quantity. The existing constant-current plug, such as the structure shown in the patent CN200510009708.4, CN95207141.X, CN01237180.7 and the like, has the problems of complex structure, difficult processing, large volume, difficult well descending and the like, and the spool shape line is designed according to experience and is not subjected to strict mathematical deduction, so that the existing constant-current plug has the defects of low constant-current control precision and the like.
In summary, based on the defects of complex structure, low constant flow control precision and the like in the prior art, the water distribution is unbalanced, the oil layer is over-injected or under-injected, the oilfield water injection cannot be accurately controlled, the water flooding recovery ratio is low, and the application is more limited.
Disclosure of Invention
The invention aims to overcome the defects of the background technology, and provides a constant flow water injection nozzle based on a mechanical choking principle, which can improve the injection allocation relation between each water injection well and an oil layer and improve the water flooding recovery ratio through fine water injection control of the water injection well.
In order to achieve the aim, the constant flow water injection spray pipe based on the mechanical choking principle comprises a spray pipe shell, wherein one end of an inner cavity of the spray pipe shell is provided with a nozzle, and the nozzle consists of a head contraction section and a throat straight pipe section which are sequentially connected; one end of the nozzle shell, which is positioned at the head contraction section, is provided with an upstream mounting pore plate, and the other end of the nozzle shell is provided with a downstream mounting pore plate;
The inner cavity of the spray pipe shell is penetrated with a guide rod, and the central axis of the guide rod coincides with the central axis of the spray pipe shell; one end of the guide rod is in threaded connection with the central hole of the upstream mounting pore plate, and the other end of the guide rod is in threaded connection with the central hole of the downstream mounting pore plate; a floater crossing the throat straight pipe section for controlling the fluid flow is sleeved on the guide rod, and two ends of the floater extend to an upstream mounting pore plate and a downstream mounting pore plate respectively to form a streamline structure;
One end of the float, which faces the upstream mounting pore plate, is a free end, the one end of the float, which faces the downstream mounting pore plate, is connected with the downstream mounting pore plate through a spring sleeved on the guide rod, and the float can axially slide along the guide rod under the drive of fluid to form a flow passage with a variable area with the straight pipe section of the throat.
In the above technical scheme, the upstream mounting pore plate and the downstream mounting pore plate have the same structure, and the upstream mounting pore plate comprises an outer ring, an inner ring arranged in the middle of the outer ring and provided with a central hole, and a supporting rod arranged between the inner wall of the outer ring and the outer wall of the inner ring; the number of the supporting rods is three, the supporting rods are uniformly distributed at intervals along the circumferential direction of the inner wall of the outer ring, and a fan-shaped channel for liquid circulation is reserved between two adjacent supporting rods.
In the technical scheme, the two ends of the guide rod are respectively provided with external threads, and the inner wall of the central hole of the inner ring is provided with internal threads matched with the external threads.
In the technical scheme, the float consists of a float head section, an effective control section and a float tail section which are sequentially connected, wherein the float head section is arranged towards an upstream mounting pore plate, the float tail section is arranged towards a downstream mounting pore plate, and the central axis of the float coincides with the central axis of the spray pipe shell.
In the technical scheme, the shape line equation of the shape bus of the effective control section of the floater along the axial direction is determined by the following formula:
Wherein: x and y are respectively the abscissa and the ordinate corresponding to any point on the contour bus, D is the diameter of the throat of the nozzle, and b is the precompression amount of the spring; T is a design parameter, Q is a design injection allocation amount, alpha is a flow coefficient of a nozzle, rho is the density of water, k is an elastic coefficient of a spring, and d is the diameter of a guide rod.
In the above technical solution, the precompression amount b of the spring is determined by the following formula:
Wherein D is the diameter of the throat of the nozzle, D is the diameter of the guide rod, Q is the design injection allocation, alpha is the flow coefficient of the nozzle, rho is the density of water, and DeltaP 1 is the design initial working pressure difference of the nozzle.
In the above technical solution, the maximum travel of the float 6 is less than or equal to L.
Compared with the prior art, the invention has the following advantages:
The constant flow water injection spray pipe based on the mechanical choking principle utilizes a mechanical component consisting of a spring and a floater arranged at the throat opening of the nozzle as a choking body, applies the mechanical movement of the spring and the floater choking body to simulate the action of the form change of an air pocket blocking layer in the cavitation choking flow nozzle on the flow, forms an additional resistance to the injected water flow, can automatically generate mechanical movement along with the change of the pressure of an upstream water injection system or a downstream oil layer to adjust the additional resistance, accurately blocks the influence of fluctuation of upstream and downstream parameters on the flow, and finally keeps the constant flow. In addition, the constant flow water injection nozzle based on mechanical choking has a simple structure and is convenient to install, the water distribution unbalance caused by different water absorption capacities of each water injection well or oil layer can be overcome, over-injection or under-injection is avoided, fine separate water injection control of an oil field is realized, and the recovery ratio is improved.
Detailed Description
Fig. 1 is a schematic structural diagram of a constant flow injection nozzle based on the principle of mechanical congestion.
Fig. 2 is a schematic view of the float structure of fig. 1.
FIG. 3 is a schematic cross-sectional view of the upstream mounting orifice plate of FIG. 1.
Fig. 4 is a schematic side view of the upstream mounting orifice plate of fig. 1.
In the figure: 1-jet tube shell, 2-nozzle, 2.1-head contraction section, 2.2-throat straight tube section, 3-upstream mounting orifice plate, 3.1-outer ring, 3.2-inner ring, 3.3-supporting rod, 4-downstream mounting orifice plate, 5-guide rod, 6-float, 6.1-float head section, 6.2-effective control section, 6.3-float tail section and 7-spring.
Detailed Description
The following examples are given to illustrate the present invention in detail, but they are not to be construed as limiting the invention. While at the same time becoming clearer and more readily understood by way of illustration of the advantages of the present invention.
The device comprises a spray pipe shell 1 as shown in fig. 1, wherein one end of an inner cavity of the spray pipe shell 1 is provided with a spray nozzle 2, and the spray nozzle 2 consists of a head contraction section 2.1 and a throat straight pipe section 2.2 which are sequentially connected; one end of the nozzle shell 1, which is positioned at the head contraction section 2.1, is provided with an upstream mounting pore plate 3, and the other end is provided with a downstream mounting pore plate 4; the inner cavity of the spray tube shell 1 is penetrated with a guide rod 5, and the central axis of the guide rod 5 coincides with the central axis of the spray tube shell 1; one end of the guide rod 5 is in threaded connection with the central hole of the upstream mounting hole plate 3, and the other end of the guide rod 5 is in threaded connection with the central hole of the downstream mounting hole plate 4; a float 6 crossing the throat straight pipe section 2.2 for controlling the fluid flow is sleeved on the guide rod 5, and two ends of the float 6 extend to the upstream mounting pore plate 3 and the downstream mounting pore plate 4 respectively to form a streamline structure; one end of the float 6, which faces the upstream mounting hole plate 3, is a free end, one end of the float 6, which faces the downstream mounting hole plate 4, is connected with the downstream mounting hole plate 4 through a spring 7 sleeved on the guide rod 5, and the float 6 can axially slide along the guide rod 5 under the drive of fluid to form a flow passage with a variable area with the throat straight pipe section 2.2.
As shown in fig. 2, the float 6 is composed of a float head section 6.1, an effective control section 6.2 and a float tail section 6.3 which are connected in sequence, the float head section 6.1 being arranged towards the upstream mounting orifice 3, the float tail section 6.3 being arranged towards the downstream mounting orifice 4, the central axis of the float 6 coinciding with the central axis of the nozzle housing 1. The shape line equation of the profile busbar of the effective control section 6.2 of the float 6 in its axial direction is determined by:
Wherein: x and y are respectively the abscissa and the ordinate corresponding to any point on the contour bus, D is the diameter of the throat of the nozzle, and b is the precompression amount of the spring; T is a design parameter, Q is a design injection allocation amount, alpha is a flow coefficient of a nozzle, rho is the density of water, k is an elastic coefficient of a spring, and d is the diameter of a guide rod.
The pre-compression amount b of the spring is determined by the following formula:
Wherein D is the diameter of the throat of the nozzle, D is the diameter of the guide rod, Q is the design injection allocation, alpha is the flow coefficient of the nozzle, rho is the density of water, and DeltaP 1 is the design initial working pressure difference of the nozzle. The maximum travel of the float 6 is less than or equal to L.
As shown in fig. 3 and 4, the upstream mounting orifice plate 3 and the downstream mounting orifice plate 4 have the same structure, and the upstream mounting orifice plate 3 comprises an outer ring 3.1, an inner ring 3.2 provided in the middle of the outer ring 3.1 and having a central hole, and a strut 3.3 provided between the inner wall of the outer ring 3.1 and the outer wall of the inner ring 3.2; the number of the supporting rods 3.3 is three, the supporting rods are uniformly arranged at intervals along the circumferential direction of the inner wall of the outer ring 3.1, and a fan-shaped channel for liquid circulation is reserved between two adjacent supporting rods 3.3. External threads are arranged at two ends of the guide rod 5, and internal threads matched with the external threads are arranged on the inner wall of the central hole of the inner ring 3.2.
The working principle of the constant flow water injection nozzle based on the mechanical choking principle is as follows: the float is a rotating body with a smooth surface, the effective control section of which approximates a cone and which tapers in diameter from upstream to downstream (the actual shape of its side is not a conical surface). Therefore, a spring-floater 'choking body' is additionally arranged in the common nozzle, and the flow can be automatically stretched and contracted along with the fluctuation of the downstream pressure, so that the constant flow is maintained. When the pressure of the upstream water injection system is increased or the pressure of the downstream stratum is reduced, the pressure difference at two ends of the floater is increased, the compression spring moves downstream, the area of an annular flow passage surrounded by the floater and the throat part of the nozzle is reduced, and the throttling degree is increased, so that the additional resistance is increased, the flow is prevented from being increased, and the water distribution flow is kept constant. Otherwise, when the pressure of the upstream water injection system is reduced or the pressure of the downstream stratum is increased, the pressure difference at the two ends of the floater is reduced, the spring is stretched, the area of the annular channel is increased, the throttling degree of fluid is reduced, the additional resistance is reduced, and the water distribution flow is maintained unchanged. In addition, for the separate-layer water injection system, when the water absorption parameter of one oil layer or a plurality of oil layers fluctuates, the rest oil layers have shielding effect on the fluctuation by the novel constant-flow water injection nozzle based on mechanical congestion, so that the designed injection allocation is maintained unchanged.
What is not described in detail in this specification is prior art known to those skilled in the art.
Claims (3)
1. Constant flow water injection spray pipe based on mechanical choking principle, including spray pipe casing (1), its characterized in that: one end of the inner cavity of the spray pipe shell (1) is provided with a spray nozzle (2), and the spray nozzle (2) consists of a head contraction section (2.1) and a throat straight pipe section (2.2) which are sequentially connected; an upstream mounting pore plate (3) is arranged at one end of the nozzle shell (1) positioned at the head contraction section (2.1), and a downstream mounting pore plate (4) is arranged at the other end of the nozzle shell (1);
The inner cavity of the spray pipe shell (1) is penetrated with a guide rod (5), and the central axis of the guide rod (5) coincides with the central axis of the spray pipe shell (1); one end of the guide rod (5) is in threaded connection with a central hole of the upstream mounting pore plate (3), and the other end of the guide rod (5) is in threaded connection with a central hole of the downstream mounting pore plate (4); a floater (6) crossing the throat straight pipe section (2.2) for controlling the fluid flow is sleeved on the guide rod (5), and two ends of the floater (6) are respectively extended to an upstream mounting pore plate (3) and a downstream mounting pore plate (4) to form a streamline structure;
One end of the floater (6) facing the upstream mounting hole plate (3) is a free end, one end of the floater (6) facing the downstream mounting hole plate (4) is connected with the downstream mounting hole plate (4) through a spring (7) sleeved on the guide rod (5), and the floater (6) can axially slide along the guide rod (5) under the driving of fluid to form a circulation channel with a variable area with the throat straight pipe section (2.2);
The float (6) consists of a float head section (6.1), an effective control section (6.2) and a float tail section (6.3) which are sequentially connected, wherein the float head section (6.1) is arranged towards an upstream mounting pore plate (3), the float tail section (6.3) is arranged towards a downstream mounting pore plate (4), and the central axis of the float (6) coincides with the central axis of the spray pipe shell (1);
the shape line equation of the profile busbar of the effective control section (6.2) of the float (6) along its axial direction is determined by:
Wherein: x and y are respectively the abscissa and the ordinate corresponding to any point on the contour bus, D is the diameter of the throat of the nozzle, and b is the precompression amount of the spring; T is a design parameter, Q is a design injection allocation amount, alpha is a flow coefficient of a nozzle, rho is the density of water, k is an elastic coefficient of a spring, and d is the diameter of a guide rod;
The pre-compression amount b of the spring is determined by the following formula:
Wherein D is the diameter of the throat of the nozzle, D is the diameter of the guide rod, Q is the design injection allocation, alpha is the flow coefficient of the nozzle, rho is the density of water, and DeltaP 1 is the design initial working pressure difference of the nozzle.
2. The constant flow water injection nozzle based on the principle of mechanical congestion according to claim 1, wherein: the upstream mounting pore plate (3) and the downstream mounting pore plate (4) have the same structure, and the upstream mounting pore plate (3) comprises an outer ring (3.1), an inner ring (3.2) with a central hole arranged in the middle of the outer ring (3.1) and a supporting rod (3.3) arranged between the inner wall of the outer ring (3.1) and the outer wall of the inner ring (3.2); the number of the supporting rods (3.3) is three, the supporting rods are uniformly distributed at intervals along the circumferential direction of the inner wall of the outer ring (3.1), and a fan-shaped channel for liquid circulation is reserved between two adjacent supporting rods (3.3).
3. The constant flow water injection nozzle based on the principle of mechanical congestion according to claim 2, wherein: external threads are arranged at two ends of the guide rod (5), and internal threads matched with the external threads are arranged on the inner wall of the central hole of the inner ring (3.2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711022568.3A CN107780906B (en) | 2017-10-27 | 2017-10-27 | Constant flow water injection nozzle based on mechanical choking principle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711022568.3A CN107780906B (en) | 2017-10-27 | 2017-10-27 | Constant flow water injection nozzle based on mechanical choking principle |
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| Publication Number | Publication Date |
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| CN107780906A CN107780906A (en) | 2018-03-09 |
| CN107780906B true CN107780906B (en) | 2024-05-28 |
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| CN111852421B (en) * | 2019-04-30 | 2022-08-30 | 中国石油天然气股份有限公司 | Large differential pressure separated injection multi-stage regulation and control water distributor |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH384230A (en) * | 1960-01-22 | 1964-11-15 | Kluebner August | Device for controlling flow rates in lines |
| CN2403001Y (en) * | 1999-11-09 | 2000-10-25 | 西安市斯坦微电子研究所 | Float pressure flowmeter |
| CN103216217A (en) * | 2013-04-23 | 2013-07-24 | 东北石油大学 | Float-type flow stabilizer |
| CN105569625A (en) * | 2014-11-10 | 2016-05-11 | 中国石油化工股份有限公司 | Underground steam flow dryness distribution and regulation device |
| CN105626020A (en) * | 2014-11-07 | 2016-06-01 | 中国石油化工股份有限公司 | Adjustable type steam flow control device |
| CN207499854U (en) * | 2017-10-27 | 2018-06-15 | 长江大学 | The constant flow water filling jet pipe for principle of being jammed based on machinery |
-
2017
- 2017-10-27 CN CN201711022568.3A patent/CN107780906B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH384230A (en) * | 1960-01-22 | 1964-11-15 | Kluebner August | Device for controlling flow rates in lines |
| CN2403001Y (en) * | 1999-11-09 | 2000-10-25 | 西安市斯坦微电子研究所 | Float pressure flowmeter |
| CN103216217A (en) * | 2013-04-23 | 2013-07-24 | 东北石油大学 | Float-type flow stabilizer |
| CN105626020A (en) * | 2014-11-07 | 2016-06-01 | 中国石油化工股份有限公司 | Adjustable type steam flow control device |
| CN105569625A (en) * | 2014-11-10 | 2016-05-11 | 中国石油化工股份有限公司 | Underground steam flow dryness distribution and regulation device |
| CN207499854U (en) * | 2017-10-27 | 2018-06-15 | 长江大学 | The constant flow water filling jet pipe for principle of being jammed based on machinery |
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| CN107780906A (en) | 2018-03-09 |
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