US20150139816A1 - Hydraulic fluid pressure control - Google Patents
Hydraulic fluid pressure control Download PDFInfo
- Publication number
- US20150139816A1 US20150139816A1 US14/547,916 US201414547916A US2015139816A1 US 20150139816 A1 US20150139816 A1 US 20150139816A1 US 201414547916 A US201414547916 A US 201414547916A US 2015139816 A1 US2015139816 A1 US 2015139816A1
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- Prior art keywords
- hydraulic fluid
- pressure
- input signal
- control circuitry
- output
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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- 239000012530 fluid Substances 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 claims description 17
- 239000004215 Carbon black (E152) Substances 0.000 claims description 8
- 238000000605 extraction Methods 0.000 claims description 8
- 229930195733 hydrocarbon Natural products 0.000 claims description 8
- 150000002430 hydrocarbons Chemical class 0.000 claims description 8
- 238000004804 winding Methods 0.000 description 4
- 230000006870 function Effects 0.000 description 3
- 238000013459 approach Methods 0.000 description 1
- 230000001143 conditioned effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000009423 ventilation 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
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
- F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
-
- 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
- E21B43/129—Adaptations of down-hole pump systems powered by fluid supplied from outside the borehole
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
- F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/08—Regulating by delivery pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/20—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by changing the driving speed
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/08—Servomotor systems incorporating electrically operated control means
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D16/00—Control of fluid pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B2203/00—Motor parameters
- F04B2203/02—Motor parameters of rotating electric motors
- F04B2203/0204—Frequency of the electric current
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B2205/00—Fluid parameters
- F04B2205/05—Pressure after the pump outlet
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
Definitions
- This invention relates to a hydraulic fluid pressure control system and method for controlling the speed of a hydraulic pump motor, for example a hydraulic pump motor which acts as a hydraulic power source for well control in an underwater hydrocarbon extraction facility.
- the control functions of a subsea well are effected by directional control valves (DCVs) that switch hydraulic pressure to sub-sea tree valves.
- DCVs directional control valves
- the hydraulic pressure is provided by a pump which is typically governed by crude low and high level pressure switches, switching the motor on or off according to two set thresholds.
- the high and low pressure trigger points must be set sufficiently far apart to allow a reasonable period of pressure decay before the pump motor is re-energised because the pump motor can only tolerate a finite number of starts under load to maximum speed, before the winding of the motor is degraded and a failure occurs.
- the DCVs have an inbuilt self-closing feature (de-latch) set at an appropriate pressure for the field as a failsafe, such that if the hydraulic pressure source fails, the DCV self closes, typically shutting down the well.
- this de-latch falls so close to the lowest hydraulic pressure from the hydraulic source pump that insufficient pressure remains to allow the requirement for a percentage safety margin.
- the required de-latch margin is calculated from the lower set point.
- the only method used to flatten out the pressure variation is by the use of mechanical pressure regulators. These have a very poor reputation for reliability. With current systems there is a danger that, at a period of low pressure, a DCV may experience an unwanted de-latch and close a valve on the wellhead tree out of sequence, causing damage to the well or its unwanted shut down.
- the present invention aims to overcome some of these difficulties.
- a hydraulic fluid pressure control system comprising: a hydraulic pump motor having an electrical input configured to receive an AC input signal and a hydraulic fluid output configured to output a pressure proportional to the frequency of the AC input signal; and electronic control circuitry connected to the electrical input, wherein the electronic control circuitry provides an AC input signal of variable frequency.
- the hydraulic fluid pressure control system could further comprise a pressure sensor connected to the hydraulic fluid output.
- the pressure sensor could produces an electrical output responsive to the sensed pressure of the hydraulic fluid output.
- the electronic control circuitry could provide an AC input signal based on the electrical output.
- the electronic control circuitry could comprise an electronic inverter.
- the electronic control circuitry could provide an AC input signal corresponding to a target pressure of the hydraulic fluid output.
- the electronic control circuitry could limit the rate of change of the AC input signal frequency.
- the pump motor acts as a power source for a directional control valve.
- the hydraulic pump motor could act as a hydraulic power source for well control in an underwater hydrocarbon extraction facility.
- a method for controlling the speed of a hydraulic pump motor comprising providing an AC input signal of variable frequency to the electrical input using electronic control circuitry.
- the method could further comprise the step of providing a pressure sensor connected to the hydraulic fluid output.
- the method could further comprise the steps of sensing the pressure of the hydraulic fluid output using the pressure sensor, and producing an electrical output responsive to the sensed pressure of the hydraulic fluid output.
- the electronic control circuitry could provide an AC input signal based on the electrical output.
- the electronic control circuitry could comprise an electronic inverter.
- the electronic control circuitry could provide an AC input signal corresponding to a target pressure of the hydraulic fluid output.
- the electronic control circuitry could limit the rate of change of the AC input signal frequency.
- the pump motor acts as a power source for a directional control valve.
- the hydraulic pump motor could act as a hydraulic power source for well control in an underwater hydrocarbon extraction facility.
- FIG. 1 schematically shows a prior art hydraulic pressure control system
- FIG. 2 schematically shows a hydraulic pressure control system in accordance with an embodiment of the present invention.
- FIG. 1 illustrates a prior art hydraulic fluid pressure control system.
- a fixed frequency, typically 50 or 60 Hz, power supply 1 feeds a hydraulic pump motor 2 , via a simple switch 3 .
- the pressure of the hydraulic output 4 is sensed by a pressure switch 5 , which has a settable high pressure operating point and a settable low pressure point and thus settable hysteresis.
- Pressure switch 5 operates and latches when the pressure has reached the high setting and thus operates the AC power switch 3 , turning off the pump 2 .
- the hydraulic output 4 acts as a hydraulic power source for directional control valve (DCV) 6 , which performs well control functions in an underwater hydrocarbon extraction facility.
- DCV directional control valve
- the following embodiment replaces the on/off pressure switch controls with a variable speed pump motor drive, thus providing a virtually constant pressure output and eliminating the need for mechanical pressure regulators, and maintaining an acceptable pressure margin above the de-latch pressures of the control DCVs.
- the substantially improved hydraulic pressure control also allows the well equipment supplier to engineer a DCV standard that satisfies field requirements.
- Variable speed motor drives are a common product, originally used in building ventilation to control large air fan speeds, and employ an electronic inverter to provide a variable frequency AC to a synchronous motor.
- FIG. 2 illustrates the above embodiment of the present invention.
- the hydraulic pump motor 2 is fed with an AC supply 7 , from an electronic inverter 8 , which is powered from the fixed frequency AC power supply 1 .
- the frequency of the AC power supply 7 and thus the motor speed of pump 2 , is conditioned to a set target for a specified input.
- the hydraulic output 9 acts as a hydraulic power source for directional control valve (DCV) 12 , which performs well control functions in an underwater hydrocarbon extraction facility.
- DCV directional control valve
- the pressure of hydraulic output 8 is measured by a pressure sensor 10 (e.g. a pressure transducer), with typically a 4-20 mA electrical output 11 , which controls the frequency of the AC output supply 7 from the inverter 8 , and thus the speed of the pump motor 2 .
- the inverter 8 incorporates electronic control circuitry allowing the speed of the motor 2 to be set according to the sensed hydraulic pressure so that the speed of pump motor 2 is reduced as the system pressure approaches the required target system pressure and typically the output frequency of inverter 8 will reduce to zero at the target pressure.
- control circuitry allows for setting of some hysteresis to provide a measured increase in motor speed from zero to maximum, avoiding damage to the motor winding and control through cold start under load to maximum speed at the start point.
- this embodiment allows the typical occasional demand on the subsea hydraulic system to be satisfied without significant deviation in hydraulic pressure providing greater margin between minimum system pressure and DCV de-latch pressure.
- An embodiment of the present invention may remove the risk of unwanted de-latching of DCVs by guaranteeing a greater margin between the field pressure at any time and the de-latch pressure of the control valves, thus allowing some projects to be executed when it might otherwise be considered unworkable.
- An embodiment of the present invention may allow well equipment suppliers to engineer a DCV standard that satisfies field requirements.
- An embodiment of the present invention may allow the switching of redundant pumps by duty switching the variable speed drive rather that switching the main current thus also protecting their motor windings, and reducing transients.
- An embodiment of the present invention may remove the need to define high and low pressure pump operating points.
- An embodiment of the present invention may substantially increase the reliability of the hydraulic system pressure control, thus providing greater confidence to the well operator.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Analytical Chemistry (AREA)
- Automation & Control Theory (AREA)
- Chemical & Material Sciences (AREA)
- General Physics & Mathematics (AREA)
- Control Of Positive-Displacement Pumps (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)
Abstract
A hydraulic fluid pressure control system comprising: a hydraulic pump motor having an electrical input configured to receive an AC input signal and a hydraulic fluid output configured to output a pressure proportional to the frequency of the AC input signal; and electronic control circuitry connected to the electrical input, wherein: the electronic control circuitry provides an AC input signal of variable frequency. The electronic control circuitry may comprise an inverter.
Description
- This invention relates to a hydraulic fluid pressure control system and method for controlling the speed of a hydraulic pump motor, for example a hydraulic pump motor which acts as a hydraulic power source for well control in an underwater hydrocarbon extraction facility.
- The control functions of a subsea well are effected by directional control valves (DCVs) that switch hydraulic pressure to sub-sea tree valves. The hydraulic pressure is provided by a pump which is typically governed by crude low and high level pressure switches, switching the motor on or off according to two set thresholds. The high and low pressure trigger points must be set sufficiently far apart to allow a reasonable period of pressure decay before the pump motor is re-energised because the pump motor can only tolerate a finite number of starts under load to maximum speed, before the winding of the motor is degraded and a failure occurs.
- The DCVs have an inbuilt self-closing feature (de-latch) set at an appropriate pressure for the field as a failsafe, such that if the hydraulic pressure source fails, the DCV self closes, typically shutting down the well. On a typical field of wells, operating at 207 bar (20.7 MPa) pressure, this de-latch falls so close to the lowest hydraulic pressure from the hydraulic source pump that insufficient pressure remains to allow the requirement for a percentage safety margin. The required de-latch margin is calculated from the lower set point. Currently, the only method used to flatten out the pressure variation, is by the use of mechanical pressure regulators. These have a very poor reputation for reliability. With current systems there is a danger that, at a period of low pressure, a DCV may experience an unwanted de-latch and close a valve on the wellhead tree out of sequence, causing damage to the well or its unwanted shut down.
- The present invention aims to overcome some of these difficulties.
- In accordance with one embodiment of the present invention, there is provided a hydraulic fluid pressure control system comprising: a hydraulic pump motor having an electrical input configured to receive an AC input signal and a hydraulic fluid output configured to output a pressure proportional to the frequency of the AC input signal; and electronic control circuitry connected to the electrical input, wherein the electronic control circuitry provides an AC input signal of variable frequency.
- The hydraulic fluid pressure control system could further comprise a pressure sensor connected to the hydraulic fluid output. The pressure sensor could produces an electrical output responsive to the sensed pressure of the hydraulic fluid output. The electronic control circuitry could provide an AC input signal based on the electrical output.
- The electronic control circuitry could comprise an electronic inverter.
- The electronic control circuitry could provide an AC input signal corresponding to a target pressure of the hydraulic fluid output.
- The electronic control circuitry could limit the rate of change of the AC input signal frequency.
- Typically, the pump motor acts as a power source for a directional control valve.
- The hydraulic pump motor could act as a hydraulic power source for well control in an underwater hydrocarbon extraction facility.
- In accordance with another embodiment of the present invention, there is provided a method for controlling the speed of a hydraulic pump motor, the hydraulic pump motor having an electrical input configured to receive an AC input signal and a hydraulic fluid output configured to output a pressure proportional to the frequency of the AC input signal, the method comprising providing an AC input signal of variable frequency to the electrical input using electronic control circuitry.
- The method could further comprise the step of providing a pressure sensor connected to the hydraulic fluid output. The method could further comprise the steps of sensing the pressure of the hydraulic fluid output using the pressure sensor, and producing an electrical output responsive to the sensed pressure of the hydraulic fluid output.
- The electronic control circuitry could provide an AC input signal based on the electrical output.
- The electronic control circuitry could comprise an electronic inverter.
- The electronic control circuitry could provide an AC input signal corresponding to a target pressure of the hydraulic fluid output.
- The electronic control circuitry could limit the rate of change of the AC input signal frequency.
- Typically, the pump motor acts as a power source for a directional control valve.
- The hydraulic pump motor could act as a hydraulic power source for well control in an underwater hydrocarbon extraction facility.
-
FIG. 1 schematically shows a prior art hydraulic pressure control system; and -
FIG. 2 schematically shows a hydraulic pressure control system in accordance with an embodiment of the present invention. -
FIG. 1 illustrates a prior art hydraulic fluid pressure control system. A fixed frequency, typically 50 or 60 Hz,power supply 1 feeds ahydraulic pump motor 2, via asimple switch 3. The pressure of thehydraulic output 4, is sensed by a pressure switch 5, which has a settable high pressure operating point and a settable low pressure point and thus settable hysteresis. Pressure switch 5 operates and latches when the pressure has reached the high setting and thus operates theAC power switch 3, turning off thepump 2. When the pressure falls to the low setting the pressure switch 5 de-latches and theAC power switch 3 switches the pump back on. Thehydraulic output 4 acts as a hydraulic power source for directional control valve (DCV) 6, which performs well control functions in an underwater hydrocarbon extraction facility. - The following embodiment replaces the on/off pressure switch controls with a variable speed pump motor drive, thus providing a virtually constant pressure output and eliminating the need for mechanical pressure regulators, and maintaining an acceptable pressure margin above the de-latch pressures of the control DCVs. The substantially improved hydraulic pressure control also allows the well equipment supplier to engineer a DCV standard that satisfies field requirements. Variable speed motor drives are a common product, originally used in building ventilation to control large air fan speeds, and employ an electronic inverter to provide a variable frequency AC to a synchronous motor.
-
FIG. 2 illustrates the above embodiment of the present invention. Thehydraulic pump motor 2, is fed with anAC supply 7, from anelectronic inverter 8, which is powered from the fixed frequencyAC power supply 1. The frequency of theAC power supply 7, and thus the motor speed ofpump 2, is conditioned to a set target for a specified input. Thehydraulic output 9 acts as a hydraulic power source for directional control valve (DCV) 12, which performs well control functions in an underwater hydrocarbon extraction facility. - The pressure of
hydraulic output 8 is measured by a pressure sensor 10 (e.g. a pressure transducer), with typically a 4-20 mAelectrical output 11, which controls the frequency of theAC output supply 7 from theinverter 8, and thus the speed of thepump motor 2. Theinverter 8 incorporates electronic control circuitry allowing the speed of themotor 2 to be set according to the sensed hydraulic pressure so that the speed ofpump motor 2 is reduced as the system pressure approaches the required target system pressure and typically the output frequency ofinverter 8 will reduce to zero at the target pressure. At pressures below the target pressure, the control circuitry allows for setting of some hysteresis to provide a measured increase in motor speed from zero to maximum, avoiding damage to the motor winding and control through cold start under load to maximum speed at the start point. Thus, this embodiment allows the typical occasional demand on the subsea hydraulic system to be satisfied without significant deviation in hydraulic pressure providing greater margin between minimum system pressure and DCV de-latch pressure. - An embodiment of the present invention may remove the risk of unwanted de-latching of DCVs by guaranteeing a greater margin between the field pressure at any time and the de-latch pressure of the control valves, thus allowing some projects to be executed when it might otherwise be considered unworkable.
- An embodiment of the present invention may allow well equipment suppliers to engineer a DCV standard that satisfies field requirements.
- An embodiment of the present invention may allow the switching of redundant pumps by duty switching the variable speed drive rather that switching the main current thus also protecting their motor windings, and reducing transients.
- An embodiment of the present invention may remove the need to define high and low pressure pump operating points.
- An embodiment of the present invention may remove the risk of damage to hydraulic pump motor windings
- An embodiment of the present invention may substantially increase the reliability of the hydraulic system pressure control, thus providing greater confidence to the well operator.
- The invention is not limited to the specific embodiments disclosed above, and other possibilities will be apparent to those skilled in the art.
- This written description uses examples to disclose the invention, including the best mode, and also to enable any person skilled in the art to practice the invention, including making and using any devices or systems and performing any incorporated methods. The patentable scope of the invention is defined by the claims, and may include other examples that occur to those skilled in the art. Such other examples are intended to be within the scope of the claims if they have structural elements that do not differ from the literal language of the claims, or if they include equivalent structural elements with insubstantial differences from the literal language of the claims.
Claims (20)
1. A hydraulic fluid pressure control system comprising:
a hydraulic pump motor having an electrical input configured to receive an AC input signal and a hydraulic fluid output configured to output a pressure proportional to the frequency of the AC input signal; and
electronic control circuitry connected to the electrical input wherein the electronic control circuitry provides an AC input signal of variable frequency.
2. The hydraulic fluid pressure control system according to claim 1 , further comprising a pressure sensor connected to the hydraulic fluid output.
3. The hydraulic fluid pressure control system according to claim 2 , wherein the pressure sensor produces an electrical output responsive to the sensed pressure of the hydraulic fluid output.
4. The hydraulic fluid pressure control system according to claim 3 , wherein the electronic control circuitry provides an AC input signal based on the electrical output.
5. The hydraulic fluid pressure control system according to claim 1 , wherein the electronic control circuitry comprises an electronic inverter.
6. The hydraulic fluid pressure control system according to claim 1 , wherein the electronic control circuitry provides an AC input signal corresponding to a target pressure of the hydraulic fluid output.
7. The hydraulic fluid pressure control system according to claim 1 , wherein the electronic control circuitry limits the rate of change of the AC input signal frequency.
8. The hydraulic fluid pressure control system according to claim 1 , wherein the pump motor acts as a power source for a directional control valve.
9. The hydraulic fluid pressure control system according to claim 1 , wherein the hydraulic pump motor acts as a hydraulic power source for well control in an underwater hydrocarbon extraction facility.
10. A hydraulic fluid pressure control system comprising:
a hydraulic pump motor having an electrical input configured to receive an AC input signal and a hydraulic fluid output configured to output a pressure proportional to the frequency of the AC input signal; and
electronic control circuitry connected to the electrical input, wherein
the electronic control circuitry provides an AC input signal of variable frequency;
a pressure sensor is connected to the hydraulic fluid output, the pressure sensor producing an electrical output responsive to the sensed pressure of the hydraulic fluid output and the electronic control circuitry providing an AC input signal based on the electrical output;
the electronic control circuitry comprises an electronic inverter;
the pump motor acts as a power source for a directional valve for well control in an underwater hydrocarbon extraction facility; and
the electronic control circuitry provides an AC input signal corresponding to a target pressure of the hydraulic fluid output.
11. The hydraulic fluid pressure control system according to claim 10 , wherein the electronic control circuitry limits the rate of change of the AC input signal frequency.
12. A method for controlling the speed of a hydraulic pump motor, the hydraulic pump motor having an electrical input configured to receive an AC input signal and a hydraulic fluid output configured to output a pressure proportional to the frequency of the AC input signal, the method comprising:
providing an AC input signal of variable frequency to the electrical input using electronic control circuitry.
13. The method according to claim 12 , further comprising the step of providing a pressure sensor connected to the hydraulic fluid output.
14. The method according to claim 13 , further comprising the steps of sensing the pressure of the hydraulic fluid output using the pressure sensor, and producing an electrical output responsive to the sensed pressure of the hydraulic fluid output.
15. The method according to claim 14 , wherein the electronic control circuitry provides an AC input signal based on the electrical output.
16. The method according to claim 12 , wherein the electronic control circuitry comprises an electronic inverter.
17. The method according to claim 12 , wherein the electronic control circuitry provides an AC input signal corresponding to a target pressure of the hydraulic fluid output.
18. The method according to claim 12 , wherein the electronic control circuitry limits the rate of change of the AC input signal frequency.
19. The method according to claim 12 , wherein the pump motor acts as a power source for a directional control valve.
20. The method according to claim 12 , wherein the hydraulic pump motor acts as a hydraulic power source for well control in an underwater hydrocarbon extraction facility.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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GB1320403.7 | 2013-11-19 | ||
GB1320403.7A GB2520349A (en) | 2013-11-19 | 2013-11-19 | Hydraulic fluid pressure control |
Publications (1)
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US20150139816A1 true US20150139816A1 (en) | 2015-05-21 |
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US14/547,916 Abandoned US20150139816A1 (en) | 2013-11-19 | 2014-11-19 | Hydraulic fluid pressure control |
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US (1) | US20150139816A1 (en) |
EP (1) | EP2886867A3 (en) |
CN (1) | CN104819175A (en) |
AU (1) | AU2014265046A1 (en) |
BR (1) | BR102014028874A2 (en) |
GB (1) | GB2520349A (en) |
SG (1) | SG10201407714PA (en) |
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US10704546B2 (en) * | 2017-06-01 | 2020-07-07 | Edward William Jackson | Service module for troubleshooting pumping unit |
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CN106015143A (en) * | 2016-07-15 | 2016-10-12 | 第拖拉机股份有限公司 | Front power output electro-hydraulic control valve of tractor |
CN110425186B (en) * | 2019-08-06 | 2020-06-26 | 南通锻压设备如皋有限公司 | Speed-pressure composite control method for rotary forging hydraulic press |
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US3759143A (en) * | 1971-05-06 | 1973-09-18 | Allis Chalmers Mfg Co | Fluid control system for earthworking apparatus including automatic pressure regulating means |
US5141402A (en) * | 1991-01-29 | 1992-08-25 | Vickers, Incorporated | Power transmission |
DE102008019501B4 (en) * | 2008-04-17 | 2019-03-21 | Robert Bosch Gmbh | Electrohydraulic control arrangement |
JP5656148B2 (en) * | 2008-07-22 | 2015-01-21 | イートン コーポレーションEaton Corporation | Oil control valve and method for controlling oil flow inside valve train |
-
2013
- 2013-11-19 GB GB1320403.7A patent/GB2520349A/en active Pending
-
2014
- 2014-11-18 SG SG10201407714PA patent/SG10201407714PA/en unknown
- 2014-11-19 CN CN201410661552.7A patent/CN104819175A/en active Pending
- 2014-11-19 US US14/547,916 patent/US20150139816A1/en not_active Abandoned
- 2014-11-19 BR BR102014028874A patent/BR102014028874A2/en not_active IP Right Cessation
- 2014-11-19 AU AU2014265046A patent/AU2014265046A1/en not_active Abandoned
- 2014-11-19 EP EP14193874.6A patent/EP2886867A3/en not_active Withdrawn
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4076457A (en) * | 1976-09-17 | 1978-02-28 | Standard Oil Company (Indiana) | Downhole pump speed control |
US5668457A (en) * | 1995-06-30 | 1997-09-16 | Martin Marietta Corporation | Variable-frequency AC induction motor controller |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10704546B2 (en) * | 2017-06-01 | 2020-07-07 | Edward William Jackson | Service module for troubleshooting pumping unit |
Also Published As
Publication number | Publication date |
---|---|
EP2886867A2 (en) | 2015-06-24 |
AU2014265046A1 (en) | 2015-06-04 |
EP2886867A3 (en) | 2015-11-11 |
GB2520349A (en) | 2015-05-20 |
SG10201407714PA (en) | 2015-06-29 |
GB201320403D0 (en) | 2014-01-01 |
BR102014028874A2 (en) | 2017-03-21 |
CN104819175A (en) | 2015-08-05 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: GE OIL & GAS UK LIMITED, UNITED KINGDOM Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:ROBERTS, TIMOTHY JAMES;REEL/FRAME:034744/0721 Effective date: 20150105 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |