CN201671609U - Closed tank-free oilfield water injection system with controllable pressure and flow - Google Patents
Closed tank-free oilfield water injection system with controllable pressure and flow Download PDFInfo
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- CN201671609U CN201671609U CN201020194044XU CN201020194044U CN201671609U CN 201671609 U CN201671609 U CN 201671609U CN 201020194044X U CN201020194044X U CN 201020194044XU CN 201020194044 U CN201020194044 U CN 201020194044U CN 201671609 U CN201671609 U CN 201671609U
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- 238000002347 injection Methods 0.000 title claims abstract description 118
- 239000007924 injection Substances 0.000 title claims abstract description 118
- 239000002332 oil field water Substances 0.000 title claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 253
- 239000006096 absorbing agent Substances 0.000 claims 1
- 230000035939 shock Effects 0.000 claims 1
- 230000001276 controlling effect Effects 0.000 description 10
- 239000003921 oil Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000003044 adaptive effect Effects 0.000 description 3
- 239000010779 crude oil Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 241000894006 Bacteria Species 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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Abstract
The utility model provides a closed tank-free oilfield water injection system with controllable pressure and flow, comprising a water source part, a pressurizing part and a water injection part, wherein, the water source part includes a first water source part which comprises a water source pump, a water source pump unit and a water source pump speed control cabinet, wherein, the water source pump speed control cabinet controls the pressure and the flow at the outlet of the water source pump by controlling the speed of the water source pump unit; the pressuring part comprises a pressurizing pump.
Description
Technical Field
The utility model relates to a pressure flow adjustable oil field water injection system especially relates to an airtight no jar pressure flow adjustable oil field water injection system.
Background
The land oil exploitation adopts a water injection mode, and the water injection exploitation supplements stratum energy, which is a basic technical means for ensuring high and stable yield of crude oil; in particular, in the middle and later stages of oil field development, there is no crude oil production without water injection. The water injection device mostly adopts a centrifugal pump and a filling plug pump. Along with the increase of the exploitation amount of the oil field, the water injection amount is correspondingly increased, and the consumption of electric energy is greatly increased. The power consumption of water injection accounts for 33% -56% of the total power consumption of crude oil production, and water injection has a great influence on the oil field recovery rate, the production cost and the production efficiency. The pump control technology is adopted in the oil field at present, namely a booster pump is used for controlling a water injection pump, the outlet of the booster pump is communicated with the inlet of the water injection pump, the booster pump provides preposed pressure for the water injection pump, the suction performance of the water injection pump is improved, and the booster pump has the advantages of adjustable flow, low power consumption and higher automation degree.
However, the conventional water injection device and the pumping station further comprise a water tank, namely the water tank is used as a water source. The required water is pumped into the water tank and then enters the pipeline of the pressure-increasing regulating pump from the water tank, so that the pressure loss is caused; secondly, if the water in the water tank dissolves oxygen in the air, bacteria in the water are easy to exceed the standard after a long time, the water quality is easy to deteriorate, water injection equipment is easy to corrode, the service life of the equipment is directly damaged, and even the bottom layer is polluted after the water is injected into an oil field.
Disclosure of Invention
An object of the utility model is to provide an airtight no jar pressure flow adjustable oil field water injection system, its water injection simple process, safe and reliable, the degree of automatic control is high, and the pressure flow is adjustable, is applicable to the requirement of water injection in the wider range. The above purpose is realized by the following technical scheme:
a closed tank-free oil field water injection system with adjustable pressure flow comprises a water source part, a pressurization part and a water injection part; the three parts are communicated through pipelines, and the device is characterized in that: the water source part comprises a first water source part, and the first water source part comprises a water source pump, a water source pump unit and a water source pump rotating speed control cabinet; the water source pump unit is respectively connected with the water source pump and the water source pump rotating speed control cabinet through circuits; the water source pump rotating speed control cabinet controls the outlet pressure and the flow of the water source pump by controlling the water source pump unit; the supercharging part comprises a booster pump, a booster pump unit and a booster pump rotating speed control cabinet; the booster pump unit is respectively in circuit connection with the booster pump and the booster pump rotating speed control cabinet; the water injection part comprises a water injection pump, a water injection pump unit and a high-voltage electric control cabinet, and the water injection pump unit is respectively connected with the water injection pump and the high-voltage electric control cabinet through circuits; the booster pump rotating speed control cabinet controls the pressure and flow of the outlet of the booster pump by controlling the rotating speed of the booster pump unit, so as to control the water injection pump unit; the high-voltage electric control cabinet controls the pressure and the flow of the outlet of the water injection pump by controlling the rotating speed of the water injection pump unit and the rotating speed of the booster pump unit.
The above object can be further improved by the following technical scheme.
The closed tank-free pressure flow adjustable oilfield water injection system further comprises a bypass valve, and the water source part is communicated with the water injection part through the bypass valve and a pipeline.
The waterhead portion comprises a second waterhead portion, the second waterhead portion being in parallel with the first waterhead portion; the second water source part comprises a second water source pump, a second water source pump unit and a second water source pump rotating speed control cabinet; the second water source pump unit is respectively in circuit connection with the second water source pump rotating speed control cabinet; and the second water source pump rotating speed control cabinet controls the pressure and the flow of the outlet of the second water source pump by controlling the rotating speed of the second water source pump unit.
The utility model has the advantages that: the utility model discloses an airtight no jar pressure flow adjustable oil field water injection system has the water injection technology and simplifies, safe and reliable, characteristics such as degree of automation height. The application of the pump control pump technology enables the pressure flow to be adjustable, so that the water injection pump is suitable for the water injection requirement of a water injection well in a wider range, can randomly adapt to the requirement of a water injection pipe network in a certain range, is flexible in water injection scheme, and further saves equipment cost and management cost. Compared with a general water injection system, the system has the following advantages:
1) the pressure loss of a water source pump (a delivery pump) is reduced, so that qualified treated sewage directly enters an inlet pipeline of a booster pump, the pressure loss of the pipeline of the booster pump and equipment after water is injected into a tank is avoided, and the unit consumption of water injection is reduced;
2) the closed water delivery is realized, and the problems that the oxygen in the air is dissolved in water and the water storage time of a tank is too long, the bacteria in the water exceed the standard, the water quality is deteriorated, water injection equipment is corroded, and even the stratum is polluted are solved;
3) the water injection process flow is simplified; the large water storage tank is removed.
4) On the basis of ensuring the water injection pressure, the water injection flow can be adjusted, so that the unit consumption of water injection is reduced to the maximum extent on the premise of meeting the water injection requirement;
5) the high-efficiency booster pump and the frequency conversion technology are applied, so that the efficiency of the water injection system is improved;
6) the automation level of a water injection system is improved;
7) the maintenance cost is reduced, and the operation is convenient.
Drawings
FIG. 1 is a schematic structural diagram of a closed tank-free pressure-flow adjustable oilfield flooding system of the present invention;
wherein,
a water source part:
a first water source part: 111 water source pump, 112 water source pump set, 113 water source pump rotating speed control cabinet, 114 water source well;
a second water source part: 121 delivery pumps, 122 delivery pump units and 123 delivery pump rotating speed control cabinets;
a pressurization part:
21 booster pump, 22 booster pump set, 23 booster pump speed control cabinet, 24 inlet valve, 25 booster pump inlet flowmeter and 26 booster pump inlet pressure gauge;
water injection part:
31 water injection pumps, 32 water injection pump units, 33 high-voltage electric control cabinets, 34 water injection pump inlet pressure gauges and 35 water injection pump outlet pressure gauges;
4 a bypass valve;
and 5, controlling the cabinet.
Detailed Description
In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the following description, with reference to the accompanying drawings and embodiments, will make further detailed description on the airtight tank-less pressure flow adjustable oil field water injection system of the present invention. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example one
As shown in fig. 1, as an implementation manner, the closed tank-free pressure-flow adjustable oilfield water injection system of the present invention comprises a water source part, a pressurization part, a water injection part and a bypass valve 4; on one hand, the water source part is communicated with the pressurizing part through a pipeline, the pressurizing part is communicated with the water filling part through a pipeline, and on the other hand, the water source part is communicated with the water filling part through a bypass valve 4 and a pipeline.
The water source part comprises a first water source part, the first water source part comprises a water source pump 111, a water source pump unit 112, a water source pump rotating speed control cabinet 113 and a water source well 114, and a valve is arranged on an output pipeline of the water source pump 111. The water source pump unit 112 is respectively connected with a water source pump rotating speed control cabinet 113 through a circuit, the inlet of the water source pump 111 is communicated with a water source well 114 through a pipeline, and the outlet of the water source pump 111 is communicated with a pressurization part through a pipeline. The water source pump rotation speed control cabinet 113 controls the water source pump 111 by controlling the rotation speed of the water source pump unit 112, so that the outlet pressure and the flow rate of the water source pump 111 are changed within a certain range.
The booster section includes a booster pump 21, a booster pump unit 22, a booster pump rotational speed control cabinet 23, an inlet valve 24, a booster pump inlet flow meter 25, and a booster pump inlet pressure gauge 26. The booster pump unit 22 is respectively connected with a booster pump rotating speed control cabinet 23 in a circuit manner, an inlet valve 24, a booster pump inlet flowmeter 25 and a booster pump inlet pressure gauge 26 are arranged on a pipeline communicated with a water source part at an inlet 4 of the booster pump 21, and the booster pump inlet pressure gauge 26 is used for converting the pressure at the inlet of the booster pump 21 into an electric signal to be output; the booster pump inlet flow meter 25 is used for measuring the flow rate of the booster pump 21 and converting the flow rate into an electric signal to be output. The outlet of the booster pump 21 is communicated with the water filling part through a pipeline.
The water injection part comprises a water injection pump 31, a water injection pump unit 32 and a high-voltage electric control cabinet 33, and the water injection pump unit 32 is respectively in circuit connection with the high-voltage electric control cabinet 33.
The booster pump rotational speed control cabinet 23 controls the booster pump 21 by controlling the rotational speed of the booster pump unit 22, so that the outlet pressure and the flow rate of the booster pump 21 are changed within a certain range, and the water injection pump unit 32 is controlled. The high-voltage electric control cabinet 33 and the booster pump unit 22 control the pressure and the flow rate at the outlet of the water injection pump 31 by controlling the rotating speed of the water injection pump unit 32 and the booster pump unit 22.
A water filling pump inlet pressure gauge 34 is included on a pipeline where the water filling section and the pressurizing section communicate with each other, and the water filling pump inlet pressure gauge 34 is used for converting the pressure at the inlet of the water filling pump 31 into an electric signal to be output. A valve and a water injection pump outlet pressure gauge 35 are provided on the output line of the water injection pump 31.
The water source part is communicated with the water injection part through a bypass valve 4 and a pipeline. I.e. the bypass valve 4 and the supercharging section are in parallel.
When the bypass valve 4 is opened and the inlet valve 24 is closed, the water injection pump 31 and the water source pump 111 are connected in series, according to the use principle of the series connection of the water pumps (the flow rates of the two pumps are adaptive, the pressure can be different; the flow rate is unchanged when the two pumps with the same performance are used in series, the pressure is added), that is, the outlet flow rates of the water injection pump 31 and the water source pump 111 are kept equal;
the outlet flow (or total) of the water injection pump 31 is equal to the outlet flow (or total) of the water source pump 111;
the outlet pressure of the water injection pump 31 is equal to the outlet pressure of the water source pump 111 plus the outlet pressure of the water injection pump 31;
when the bypass valve 4 is closed and the inlet valve 24 is opened, the water injection pump 31, the booster pump 21 and the water source pump 111 are connected in series, according to the use principle of the water pump series connection (the flow rates of the two pumps are adaptive, the pressure can be different; when the two pumps with the same performance are operated in series, the flow rate is unchanged, the pressure is added), that is, the outlet flow rates of the water injection pump 31, the booster pump 21 and the water source pump 111 are kept, and the like;
the outlet flow of the water injection pump 31 is equal to the outlet flow of the booster pump 21 is equal to the outlet flow of the water source pump 111;
the outlet pressure of the water injection pump 31 is equal to the outlet pressure of the water source pump 111, the outlet pressure of the booster pump 21 and the pump pressure of the water injection pump 31;
in the embodiment, the outlet flow of the water source pump 111 is supplied to ensure the outlet flow of the water injection pump (31);
the range of the outlet pressure variation of the water injection pump 31 is as follows:
the outlet pressure of the water source pump 111 + the pump pressure of the water injection pump 31 to the outlet pressure of the water source pump 111 + the outlet (adjustable) pressure of the booster pump 21 + the pump pressure of the water injection pump 31.
Example two
Example two includes all the apparatuses of example one, and as a preferred implementation, the water source part further includes a second water source part, and the second water source part includes a delivery pump 121, a delivery pump assembly 122 and a delivery pump rotation speed control cabinet 123. The delivery pump unit 122 is respectively connected with a delivery pump rotating speed control cabinet 123 in a circuit mode, the inlet of the delivery pump 121 is communicated with the sewage station through a pipeline, and the outlet of the delivery pump 121 is communicated with the pressurization part through a pipeline. The delivery pump rotating speed control cabinet 123 controls the delivery pump 121 by controlling the rotating speed of the delivery pump unit 122, and the pressure and the flow rate of the delivery pump 121 are changed within a certain range, so that the supply of the booster pump is ensured. A valve is provided on the output line of the delivery pump 121.
The water source pump 111 and the delivery pump 121 are connected in parallel. The parallel use principle of the water pumps is as follows: the pressure of the two pumps must be equal, and the flow rate can be unequal; when two pumps with the same performance are operated in parallel, the pressure is unchanged, and the flow is added.
When the bypass valve 4 is opened and the inlet valve 24 is closed, the water source pump 111 and the delivery pump 121 are connected in parallel, and the pump groups connected in parallel are connected in series with the water injection pump 31, that is, the outlet pressures of the water source pump 111 and the delivery pump 121 are equal, and the pump groups connected in parallel should meet the outlet flow requirement of the water injection pump 31;
the outlet flow of the water injection pump 31 is equal to the outlet flow of the water source pump 111 plus the outlet flow of the delivery pump 121;
the outlet pressure of the water injection pump 31 is equal to the outlet pressure of the water source pump 111 (or the outlet pressure of the delivery pump 121) + the pump pressure of the water injection pump 31;
when the bypass valve 4 is closed and the inlet valve 24 is opened, the water source pump 111 and the delivery pump 121 are connected in parallel, and the pump set connected in parallel is connected in series with the booster pump 21 and the water injection pump 31; namely, the outlet pressures of the water source pump 111 and the delivery pump 121 are equal, and the outlet flows of the pump group connected in parallel, the booster pump 21 and the water injection pump 31 are equal and adaptive;
the outlet flow of the water injection pump 31 is equal to the outlet flow of the water source pump 111 plus the outlet flow of the delivery pump 121;
the outlet pressure of the water injection pump 31 is equal to the outlet pressure of the water source pump 111 (or the outlet pressure of the delivery pump 121) + the outlet pressure of the booster pump 21 (pump pressure) + the pump pressure of the water injection pump 31;
in a preferred embodiment, filters are installed at the inlets of the water source pump 112 and the transfer pump 122 to filter water. As a preferred embodiment, dampers are provided on the inlet and outlet lines of the booster pump 21, respectively.
In the present embodiment, the range of the outlet flow rate variation of the water injection pump 31 is:
the outlet flow of the source pump 111 to the outlet flow of the source pump 111 + the outlet flow of the delivery pump 121,
the range of the outlet pressure variation of the water injection pump 31 is as follows:
the outlet pressure of the water source pump 111 + the outlet pressure (pump pressure) of the water injection pump 31 to the outlet pressure of the water source pump 111 + the outlet pressure (pump pressure) of the booster pump 21 + the pump pressure of the water injection pump 31.
Preferably, the closed tank-free pressure flow adjustable oilfield water injection system further comprises a variable frequency speed control system comprising a control cabinet 5. The control cabinet 5 compares the flow value and the pressure value detected by each instrument with the set flow value and pressure value, obtains the control signal of each rotating speed control cabinet by adopting an intelligent control method, and outputs the control signals to each rotating speed control cabinet, so that the water source pump (and/or the delivery pump), the booster pump and the water injection pump realize three-pump dynamic balance, and the control of the water outlet pressure and the flow of the closed tank-free pressure flow adjustable oil field water injection system is realized. The control of the water source pump rotating speed control cabinet 113, the conveying pump rotating speed control cabinet 123, the booster pump rotating speed control cabinet 23 and the high-voltage electric control cabinet 33 is realized through the operation of the control cabinet 5, so that the control of the water source pump 112, the conveying pump 122, the booster pump 22 and the water injection pump 32 is realized.
Finally, it should be noted that it is obvious that various changes and modifications can be made to the present invention by those skilled in the art without departing from the spirit and scope of the present invention. Thus, it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.
Claims (10)
1. A closed tank-free oil field water injection system with adjustable pressure flow comprises a water source part, a pressurization part and a water injection part; the three parts are communicated through pipelines, and the device is characterized in that:
the water source part comprises a first water source part, and the first water source part comprises a water source pump (111), a water source pump set (112) and a water source pump rotating speed control cabinet (113); the water source pump unit (112) is respectively in circuit connection with the water source pump (111) and the water source pump rotating speed control cabinet (113); the water source pump rotating speed control cabinet (113) controls the outlet pressure and the flow of the water source pump (111) by controlling the water source pump unit (112);
the supercharging part comprises a booster pump (21), a booster pump unit (22) and a booster pump rotating speed control cabinet (23); the booster pump unit (22) is respectively in circuit connection with the booster pump (21) and the booster pump rotating speed control cabinet (23);
the water injection part comprises a water injection pump (31), a water injection pump unit (32) and a high-voltage electric control cabinet (33), and the water injection pump unit (32) is respectively in circuit connection with the water injection pump (31) and the high-voltage electric control cabinet (33);
the booster pump rotating speed control cabinet (23) controls the pressure and the flow rate of the outlet of the booster pump (21) by controlling the rotating speed of the booster pump unit (22), and further controls the water injection pump unit (32); the high-voltage electric control cabinet (33) controls the pressure and the flow rate of the outlet of the water injection pump (31) by controlling the rotating speeds of the water injection pump unit (32) and the booster pump unit (22).
2. The closed tankless oil field flooding system with adjustable pressure and flow of claim 1, characterized in that:
the water injection system also comprises a bypass valve (4), and the water source part is communicated with the water injection part through the bypass valve (4) and a pipeline.
3. The closed tankless oil field flooding system with adjustable pressure and flow of claim 1, characterized in that:
the waterhead portion comprises a second waterhead portion, the second waterhead portion being in parallel with the first waterhead portion; the second water source part comprises a second water source pump (121), a second water source pump set (122) and a second water source pump rotating speed control cabinet (123); the second water source pump unit (122) is respectively in circuit connection with the second water source pump (121) and a second water source pump rotating speed control cabinet (123); the second water source pump rotating speed control cabinet (123) controls the pressure and the flow rate of the outlet of the second water source pump (121) by controlling the rotating speed of the second water source pump unit (122).
4. The closed tankless oil field flooding system with adjustable pressure and flow of claim 2, characterized in that:
the booster pump (21) is respectively communicated with the water source part (1) and the water injection part through pipelines.
5. The closed tankless oil field flooding system with adjustable pressure and flow of claim 4, characterized in that:
the booster pump (21) and the water source part are communicated with each other, and an inlet valve (24) is arranged on a pipeline.
6. The closed tankless oil field flooding system with adjustable pressure and flow of claim 5, characterized in that:
and a booster pump inlet flow meter (25) and a booster pump inlet pressure meter (26) are arranged on a pipeline for communicating the booster pump (21) and the water source part.
7. The closed tankless oil field flooding system with adjustable pressure and flow of claim 1, characterized in that:
and a water injection pump inlet pressure gauge (34) and a water injection pump outlet pressure gauge (35) are arranged on a pipeline for communicating the water injection part with the pressurizing part.
8. The closed tankless oil field flooding system with adjustable pressure and flow of claim 1, characterized in that:
and shock absorbers are respectively arranged on pipelines of an inlet and an outlet of the booster pump (21).
9. The closed tankless oil field flooding system with adjustable pressure and flow of claim 3, characterized in that:
filters are arranged at the inlets of the water source pump (112) and the delivery pump (122).
10. The closed tankless oil field flooding system with adjustable pressure and flow of claim 5, characterized in that:
and a valve is arranged on the output pipeline of the water injection pump (31).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020194044XU CN201671609U (en) | 2010-05-18 | 2010-05-18 | Closed tank-free oilfield water injection system with controllable pressure and flow |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020194044XU CN201671609U (en) | 2010-05-18 | 2010-05-18 | Closed tank-free oilfield water injection system with controllable pressure and flow |
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| Publication Number | Publication Date |
|---|---|
| CN201671609U true CN201671609U (en) | 2010-12-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201020194044XU Expired - Fee Related CN201671609U (en) | 2010-05-18 | 2010-05-18 | Closed tank-free oilfield water injection system with controllable pressure and flow |
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| CN (1) | CN201671609U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102423520A (en) * | 2011-09-13 | 2012-04-25 | 陕西银河消防科技装备有限公司 | Multistage combined flow-increasing pressure-increasing device |
| CN102747992A (en) * | 2012-07-16 | 2012-10-24 | 新疆石油勘察设计研究院（有限公司） | Airtight no-tank electric control valve double-control water injection device and water injection method thereof |
| CN104941301A (en) * | 2015-06-09 | 2015-09-30 | 新乡市万和过滤技术股份公司 | Recharge filter device for geothermic water cyclic utilization |
| CN107131131A (en) * | 2017-06-08 | 2017-09-05 | 上海创丞科功水利科技有限公司 | A kind of flow equilibrium method of water pump serial-connection system |
-
2010
- 2010-05-18 CN CN201020194044XU patent/CN201671609U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102423520A (en) * | 2011-09-13 | 2012-04-25 | 陕西银河消防科技装备有限公司 | Multistage combined flow-increasing pressure-increasing device |
| CN102747992A (en) * | 2012-07-16 | 2012-10-24 | 新疆石油勘察设计研究院（有限公司） | Airtight no-tank electric control valve double-control water injection device and water injection method thereof |
| CN104941301A (en) * | 2015-06-09 | 2015-09-30 | 新乡市万和过滤技术股份公司 | Recharge filter device for geothermic water cyclic utilization |
| CN107131131A (en) * | 2017-06-08 | 2017-09-05 | 上海创丞科功水利科技有限公司 | A kind of flow equilibrium method of water pump serial-connection system |
| CN107131131B (en) * | 2017-06-08 | 2019-04-26 | 上海创丞科功水利科技有限公司 | A kind of flow equilibrium method of water pump serial-connection system |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101215 Termination date: 20140518 |