WO2005078233A1 - Power generation system - Google Patents
Power generation system Download PDFInfo
- Publication number
- WO2005078233A1 WO2005078233A1 PCT/NO2005/000060 NO2005000060W WO2005078233A1 WO 2005078233 A1 WO2005078233 A1 WO 2005078233A1 NO 2005000060 W NO2005000060 W NO 2005000060W WO 2005078233 A1 WO2005078233 A1 WO 2005078233A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- turbine
- fluid
- installation
- electrical power
- supply line
- Prior art date
Links
- 238000010248 power generation Methods 0.000 title description 4
- 238000009434 installation Methods 0.000 claims abstract description 81
- 239000012530 fluid Substances 0.000 claims abstract description 79
- 238000000034 method Methods 0.000 claims abstract description 28
- 239000007924 injection Substances 0.000 claims description 19
- 238000002347 injection Methods 0.000 claims description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 19
- 238000004891 communication Methods 0.000 claims description 16
- 238000007667 floating Methods 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 5
- 230000004044 response Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 2
- 238000000819 phase cycle Methods 0.000 claims description 2
- 238000012546 transfer Methods 0.000 claims description 2
- 230000001276 controlling effect Effects 0.000 claims 2
- 230000001105 regulatory effect Effects 0.000 claims 1
- 230000009466 transformation Effects 0.000 claims 1
- 230000001131 transforming effect Effects 0.000 claims 1
- 241000191291 Abies alba Species 0.000 description 16
- 238000004519 manufacturing process Methods 0.000 description 16
- 238000012545 processing Methods 0.000 description 9
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 229930195733 hydrocarbon Natural products 0.000 description 3
- 150000002430 hydrocarbons Chemical class 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 239000008186 active pharmaceutical agent Substances 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- ZZUFCTLCJUWOSV-UHFFFAOYSA-N furosemide Chemical compound C1=C(Cl)C(S(=O)(=O)N)=CC(C(O)=O)=C1NCC1=CC=CO1 ZZUFCTLCJUWOSV-UHFFFAOYSA-N 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000004148 unit process Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 239000003643 water by type Substances 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
- E21B33/035—Well heads; Setting-up thereof specially adapted for underwater installations
- E21B33/0355—Control systems, e.g. hydraulic, pneumatic, electric, acoustic, for submerged well heads
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B13/00—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates
- F03B13/10—Submerged units incorporating electric generators or motors
-
- 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
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
- E21B41/0007—Equipment or details not covered by groups E21B15/00 - E21B40/00 for underwater installations
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Definitions
- the present invention generally relates to a system for supplying electrical power to a remote subsea installation. More specifically, in one illustrative example, the invention relates to method and system for generating electrical power locally for an autonomous subsea installation such as a Christmas tree.
- the subsea installation being connected to a second installation by a fluid supply line or flowline, where said second installation being arranged to supply pressurized fluid through the fluid supply line to the subsea installation.
- the production from a subsea well is controlled by a number of valves that are assembled into a unitary structure generally referred to as a Christmas tree.
- the actuation of the valves is normally dependent upon hydraulic fluid to power hydraulic actuators that operate the valves.
- Hydraulic fluid is normally supplied through an umbilical running from a remote station located on a vessel or platform at the surface. Less commonly, the hydraulic umbilical may be run from a land- based station.
- the actuators are controlled by pilot-operated control valves housed in a control module located at or near the subsea installation.
- the control valves direct the supply of fluid to each actuator, as required for each particular operation.
- the pilot valves may be electrically actuated, such as by solenoids. Such a system is commonly referred to as an electro-hydraulic system.
- a connection In order to control a subsea well, a connection must be established between the well and a monitoring and control station.
- the monitoring and control station may be located in a platform or floating vessel near the subsea installation, or alternatively in a more remote land station.
- the connection between the control station and the subsea installation is usually established by installing an umbilical between the two points.
- the umbilical must include hydraulic lines for supplying hydraulic fluid to the various hydraulic actuators located on or near the well.
- the umbilical may also include electrical lines for supplying electric power and also for communicating control signals to and/or from the various monitoring and control devices located on or near the well.
- the typical umbilical is a very complicated and expensive item. The umbilical can cost several thousand U.S. dollars per meter of length, and may be thousands of meters long.
- existing subsea electric actuators are powered from a remote location through a subsea cable, in order to ensure a sufficient and reliable supply of electric power. It is usually required that the power supply be sufficient to operate all the valves simultaneously. If the distance between the land station and the subsea installation is very large, even such a cable becomes very costly. Also, hydrocarbons have been found in the Arctic, where ice prohibits the use of a floating production unit or even access to the well for most of the year. Also at times it may be desirable to locate a single well a distance from the main installation without having to invest in costly supply or communication lines. A typical example of such a well may be a water injection well.
- Batteries have recently been developed which can store enough power to operate all valves in a subsea installation, if necessary simultaneously, thus enabling power for the electric actuators to be stored in locally installed batteries.
- An added advantage is that the operation of such actuators will be independent of the water depth of the system. The need for pilot valves will also be eliminated, since the actuators may be directly controlled electrically. Thus, there will also be potentially large savings on umbilical cost since the hydraulic lines can be removed.
- All-electric subsea systems require a more sophisticated control system than electro-hydraulic systems.
- the control system must control the charging of the batteries and monitor their status.
- the control system should also monitor the status and position of each valve so that at any time an operator can access this information and intervene if necessary.
- the control system must implement the failsafe function and close all valves if required.
- the present invention is directed to a method and an apparatus for solving, or at least reducing the effects of, some or all of the aforementioned problems by establishing a reliable power supply and a control system that ensures that the actuators are operable at all times.
- the present invention is directed to a system and method for supplying electric energy at a subsea installation as defined in the independent claims and more specifically an electrical power generation system for a subsea installation, and various methods of operating same. Preferred embodiment are given in the dependent claims.
- the invention comprises a control system for an autonomous subsea installation.
- the subsea installation may include one or more electrically operated components, such as electric actuators for controlling one or more valves, and at least one injection flowline.
- a system for generating an electric power output locally at the subsea installation is provided by transferring energy from a land station, to the remote installation through an injection flowline by pressurizing the injection fluid above what is necessary for the injection operation. The excess energy thus created at the land station is used to drive a turbine which is positioned in the flowline, such that fluid flowing through the flowline rotates the turbine to generate electrical power.
- a flowline specifically for transferring energy to the subsea installation, without using the transported fluid through the flowline to anything else. This might be the case where it is economically favourable to install a flowline compared with laying an electric cable.
- the fluid transported for generating electric energy at the subsea installation may be pure water or other fluid which may be spilled to the environment, without environmental damage.
- the turbine may be positioned in a bypass loop, so that fluid can be selectively directed through the turbine as required.
- One or more electrical power storage devices such as batteries, are also provided for local power storage, wherein the power stored in the batteries is sufficient to power the electric actuators or to charge one or more batteries, the power from which may then be used to power the actuators.
- a control module for controlling the operation of the actuators, turbine, and batteries may also be provided, as well as an acoustic communication unit for communicating with the control module from a remote location such as a surface vessel or platform.
- Each electric actuator comprises an electric motor.
- Locally placed batteries provide direct power to the electric actuators to open and close the valves.
- the batteries are charged from the turbine as needed.
- the control module monitors the state of the batteries and sends, a signal to engage the turbine whenever the charge of any battery falls below a predetermined level.
- the control system includes an acoustic transmitter and an acoustic receiver for communication with a control station at a remote location.
- the control station may be located anywhere in the world.
- the acoustic transmitter and acoustic receiver could communicate with a buoy at the surface, which buoy is then linked to a communications satellite.
- the invention comprises a wholly autonomous subsea installation, which can operate indefinitely without human intervention.
- a control system is provided, which can monitor and control the well without external guidance, while allowing access to collected data and emergency intervention if necessary.
- the control system is adapted to monitor the flow of fluid through the flowline, to ensure that the system is operating correctly.
- the all- electric control system according to this exemplary embodiment of the invention results in a subsea installation which is simpler and less expensive than existing installations.
- the invention is especially advantageous for injection wells, because these wells are very often are located remotely from other subsea installations in a particular field, and thus would otherwise require separate, dedicated umbilicals.
- Other installations where the invention may find use are gas wells where a supply of hydrate inhibiting fluid is necessary for the safe transport of the gas to the land station.
- the second installation from which the supply fluid line or flowline is directe, and which second installation comprises means for adding energy to the transported fluid may be a landbased installation, a offshore, fixed or floating installation. There may of course be several supply fluid lines running from the second installation to several subsea installations.
- Fig. 1 shows an exemplary embodiment of the invention
- Fig. 2 shows a schematic of a subsea installation according an exemplary embodiment of the invention
- Fig. 3 shows an exemplary embodiment generator bypass loop
- Fig. 4 shows a detailed view of an exemplary embodiment turbine
- Fig. 5 shows an exemplary embodiment algorithm for monitoring the flow direction in the flowline and responding thereto.
- a subsea installation 1 is located on the seabed 2.
- the installation 1 includes a Christmas tree 11 mounted on a wellhead 12, the wellhead being the uppermost part of a well that extends down into the sea floor to a subterranean hydrocarbon formation.
- the Christmas tree 11 has at least one electrically operated device such as electric actuator 13 for actuating at least one flow control valve (not shown).
- An electrically operated control module 14 is attached to the Christmas tree 11.
- the control module 14 houses electronic equipment for receiving and transmitting control and/or telemetry signals 19.
- the control module 14 also houses one or more electric power storage devices 22, 23 (in Fig.
- a cable 15 extends from the control module 14 to actuator 13.
- Other equipment such as various electrically operated sensors, may also be connected to the control module 14.
- the Christmas tree 11 may also include a remotely operated vehicle (ROV) panel (not shown) to allow manual actuation of the valves by an ROV, as is well known in the art.
- a vessel 3, such as a floating processing unit (FPU) is located on the surface 4 of the water.
- a fluid supply line or flowline 5 extends from the vessel 3 to the Christmas tree 11.
- a local power generating system 30 is operatively connected to the flowline 5.
- a cable 31 connects the generating system 30 with the control module 14.
- a hydro -acoustic communication unit 16 is attached to the Christmas tree 11 and is connected to the control module 14 via cable 17.
- the communication unit 16 includes a first antenna 18, an acoustic transmitter (not shown), and an acoustic receiver (not shown).
- the vessel 3 further includes a second antenna 20 for receiving and transmitting acoustic control and telemetry signals 19 to and from the antenna 18 on the Christmas tree 11.
- different communication methods may be employed, such as radio waves.
- the antenna 18 may be deployed on a buoy (not shown) floating on the surface 4. The buoy could then be linked to a remote station via a satellite link, cable, radio, or other ' suitable communication means.
- the Christmas tree 11 is a water injection tree. Water is pumped from the vessel 3, through flowline 5, and to the subsea installation 1 where it is injected into the formation.
- the flowline 5 may extend from a processing or separation unit (not shown) located remotely from the well.
- the processing or separation unit processes the fluid produced from other wells in the formation, and separates the produced water from the hydrocarbons.
- the processing or separation unit may be located subsea, on a vessel or platform, or on land.
- Fig. 2 shows a schematic of the Christmas tree 11 connected to the wellhead 12.
- the subsea well is completed in the usual manner by first drilling a hole and installing a conductor pipe, then installing a wellhead and a series of concentric casing strings anchored in the wellhead. Lastly the tubing string and tubing hanger are installed in the well and the Christmas tree 11 is connected to the wellhead 12.
- 41 denotes the production flow passage, which communicates with the flow bore of the production tubing string.
- 42 denotes the annulus passage, which communicates with the annular space between the tubing and the innermost casing string.
- 43 denotes the production outlet, from which produced fluids would normally exit in a producing well.
- the production outlet 43 is used to inject water into the well.
- the production outlet 42 is connected to flowline 5.
- the refere Ince number 44 denotes a crossover passage, which links the annulus passage 42 and the production flow passage 41.
- a master production valve 45 is located in the production flow passage 41, and a master annulus valve 46 is located in the annulus passage 42.
- a crossover valve 47 controls fluid flow through the crossover passage 44.
- a production wing valve 50 is located in production outlet 43.
- a choke valve 48 controls the pressure in the production outlet 43.
- the power generating system 30 comprises a turbine 60 (not indicated on fig. 2), which is located in the flow path of production outlet 43, in a manner that is described more fully below.
- Valves 45, 46, 47, 48 and 50 are each operated by an electric actuator.
- each electric actuator (not shown) includes an electric motor, a gearbox, and a driveshaft, which is connected to its respective valve spindle via a standard API interface.
- the electric motor may be a brushless type DC motor and the gearbox may be a planetary gearbox.
- Examples of a suitable motor 185 and gearbox 175 combination include a model named TPM 050 sold by the German company Wittenstein.
- Each electric actuator has an associated motor controller (not shown) for receiving and sending signals from the control module 14 and modulating power to the motor upon receiving the appropriate commands from the control module 14.
- Each electric actuator is housed in a removable unit (not shown).
- the standard API interface makes it possible to remove the actuator in an emergency, and to actuate the valve spindle directly with an ROV or a diver.
- Workover valves 5 and 52 are also located in the Christmas tree. These additional valves may be operated by hydraulic actuators (not shown), and are used for access to the well during workover situations. During workover an umbilical (not shown) will be used to supply hydraulic fluid to any remaining hydraulic actuators and to wellhead connector 53. The workover umbilical is connected to a workover unit 54 as shown.
- a number of sensors are located in the subsea installation to monitor various parameters of the system.
- a pressure/temperature (PT) sensor 56 is located in the annulus passage 42.
- Another PT sensor 58 is located in the production outlet 43 upstream water injection flow of the choke 48.
- a third PT sensor 57 is located in the production outlet 43 downstream water injection flow of the choke. Sensors 57 and 58 are used to monitor the pressure of the injection fluid as it is pumped into the well. This information is used to regulate the choke 48 to achieve the desired injection pressure.
- the control module 14 houses a processing unit 21, which includes electronics to receive and transmit signals to the various devices in the system, and to the hydro- acoustic antenna 18.
- the electronics in processing unit 21 also direct electric power as required to the various devices, including the electric valve actuators.
- the exemplary control module 14 also houses at least two batteries 22, 23 for redundancy.
- the processing unit controls the operation of the electric actuators (not shown) and the turbine 60 (in Fig. 4), monitors the charge of the batteries 22, 23 via a charge sensor (not shown), and handles communication signals both internally and externally of the system.
- An acoustic communication unit 16 includes the antenna 18, and provides communication, with the receiving antenna 20 (in Fig. 1) at the surface vessel, platform, or remote station.
- the electric actuators may be equipped with mechanical failsafe springs (not shown), to provide a failsafe closed capability.
- the wing valve 50 is depicted with a failsafe spring.
- the failsafe springs are omitted from the other electric actuators.
- the processing unit 21 can be used, as long as electrical power is available, to provide failsafe closed functionality. Without electrical power the electric actuators will have a fail "as is" functionality.
- the power generating system 30 includes a turbine 60 installed closed pipe loop 32, which is coupled to control valve 38 via flanges 33 and 34.
- the turbine 60 is operatively connected to flowline 5, and valve 38 regulates the flow of fluid from flowline 5 to the turbine 60.
- the valve 38 may be operated by an electric actuator (not shown), which may be controlled by the control module 14 (in Fig 2). With this arrangement a controlled amount of fluid may be supplied through the pipe loop 32 as needed, to provide electricity to charge the batteries 22,23 (in Fig. 2).
- Valve 38 may be positioned in a first position such that fluid flowing through the flowline 5 is directed through the pipe loop 32.
- Valve 38 may also be positioned in a second position such that flow through flowline 5 bypasses the pipe loop 32 entirely.
- the turbine 60 is shown in greater detail in Fig. 4.
- the turbine 60 includes a plurality of turbine blades 36 extending between a central shaft 39 and an outer ring 35.
- the blades 36 are distributed evenly around the shaft 39.
- the turbine 60 is rotated by the flow of fluid through pipe loop 32.
- a number of rotating permanent magnets 37 are mounted on the outer diameter of ring 35 to form rotor windings.
- Additional stationary permanent magnets 40 are fixedly mounted in a ring arrangement around the permanent magnets 37 to form stator windings.
- rotation of the rotor inside the stator will cause relative movement between the rotating and stationary magnets, thus creating a current and generating electric power.
- the windings in the stator are arranged to produce a three-phase AC power output or signal in a known manner.
- the turbine is installed directly into the flow line and there is no control valve.
- the turbine will in this case rotate all the time, whether under load or not. This enables the turbine to be used for measurements that will monitor the state of the syste, as will be explained in more detail below.
- the system includes sensors (not shown) for sensing the speed and direction of rotation of the turbine 60.
- sensors for sensing the speed and direction of rotation of the turbine 60.
- the AC output can be expressed as three temporally offset sinusoidal curves or phases (A, B, and C).
- the time between the peaks of adjacent phases determines the frequency and thereby the rotational speed of the turbine 60.
- a speed sensor is thus provided for sensing this frequency.
- the rotational direction of the turbine 60 can be determined from the sequence of the three phases.
- a change in the sequence of the phases (for example from ABC to BAC) will indicate a change in the direction of rotation of the turbine 60.
- a direction sensor is also provided for sensing the sequence of at least two of the three phases of the three-phase AC signal.
- the sensors for sensing the frequency and phase sequence of the power output may comprise calculation routines within the processing unit 21 of the control module 14 (see fig. 2).
- the turbine 60 is running free or with a very small electrical load.
- the rotational speed and direction may be constantly monitored. From the rotational speed, the flowrate Q can be determined, thus allowing the detection of interruptions in the flow.
- the rotational speed may be compared to the current being produced by the generator. This enables the efficiency and/or performance of the turbine 60 to be monitored. Parameter measurements in a predetermined range may give an indication that the turbine 60 is failing and should be replaced.
- Another way to measure the performance of the turbine 60 is to measure the drop in rotational speed when the turbine 60 is placed under electrical load. For the particular turbine 60 used, the relationship between current output and the slowing of the turbine 60 under load will be known.
- the slowing of the turbine 60 and/or the current output should deviate from this known relationship, it may be an indication that the turbine 60 is failing. Comparing the speed of the turbine 60 and the current generated will also give an indication of the efficiency of the turbine 60. A change in these readings over time may give an early warning of turbine 60 failure so that the turbine 60 can be replaced with a minimum of system downtime.
- Measuring the rotational speed will also measure the flow, since the flow rate is proporational to the number of revolutions per minute of the turbine 60. Such measurements may be compared with the flow rate measured at the pumping station, in order to determine if there are leaks any leaks present in the system.
- a reversal in flow direction indicates that the well may have become unstable and/or water is flowing out of the well.
- the flow control valves (45 and 46) should be closed immediately to avoid problems with the well.
- An algorithm for accomplishing this is shown diagrammatically in Fig. 5.
- the flow direction can be measured in two ways. First, on the left hand side of Fig. 5 the direction of rotation of the turbine 60 is measured. A reversal of direction indicates that the flow is in the wrong direction and the master valve 45 should be closed. However, it is possible that this reading could be faulty, for example because of a fault in the turbine 60.
- the pressure drop across the choke is also measured, as shown on the right hand side of Fig. 5. If the pressure drop is positive across the choke, a faulty turbine 60 unit is indicated, and the remote control station is notified. If the pressure drop across the choke is negative, this confirms that fluid is flowing out of the well. In this case the master valve 45 should be closed automatically.
- water is supplied through the flowline 5 to main passages 43 and 41.
- the master valve 45 and wing valve 50 are held in the open position, allowing water to be pumped down the well and into the formation.
- the control module 14 monitors the various parameters at the well, including the charge level on the batteries 22,23, and sends this information to a remote control station (not shown) on the vessel 3 (in Fig. 1) or on land.
- a signal is sent to engage (in an electrical sense) the turbine 60.
- the turbine 60 In the engaged state, the turbine 60 generates electrical power.
- the electricity generated by the turbine 60 is sent through cable 31 to recharge the batteries 22, 23.
- a signal is sent to disengage the turbine 60, i.e., to remove the electrical load from the turbine 60, and the turbine 60 is allowed to return to its free-running state. In the electrically disengaged state, the turbine 60 generates little or no electrical power.
- the flowline is a water injection flowline.
- other fluids may be supplied to the Christmas tree that can be utilized for the same purpose, e.g. extracting energy.
- Such fluids may include, but not restricted to, chemicals such as scale or hydrate inhibitors, methanol or MEG.
- the fluid transferred may in one embodiment not be used to anything at the subsea installation but just be used for the transfer of energy to the subsea installation.
- the downhole safety valve may be a simple single-acting valve, for example a flapper valve. This type of valve will remain open as long as fluid is flowing into the well, but will close automatically when the fluid flow stops or reverses, thus closing off the well.
- a surface controlled subsurface safety valve SCSSV
- a valve such as that described in Norwegian Patent Specification No. 313 209. can be used. Since this valve can be controlled from the outside of the Christmas tree, an electric actuator may be used.
- the safety control valve may also be manually closed, using an ROV if necessary.
- the power generating system 30 could be operatively coupled to the methanol or other chemical injection flowline to the well, and the fluid pressurized above what is needed for its function, thus the excess energy in the flow is utilized to rotate the turbine 60.
- the present invention is directed to an electrical power generation system, and various methods of operating same.
- the system comprises at least one flowline, a turbine operatively connected to the flowline, the turbine being rotatable by fluid flowing through the flowline, and the turbine generating the electrical power output when the turbine is rotated.
- the method comprises operatively connecting a turbine to the flowline and directing a flow of fluid through the turbine to thereby generate the electrical power output.
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- Engineering & Computer Science (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA2556563A CA2556563C (en) | 2004-02-18 | 2005-02-18 | Power generation system |
AU2005213577A AU2005213577B2 (en) | 2004-02-18 | 2005-02-18 | Power generation system |
BRPI0507831-8A BRPI0507831A (en) | 2004-02-18 | 2005-02-18 | power generation system |
GB0617965A GB2427227B (en) | 2004-02-18 | 2005-02-18 | Power generation system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NO20040706 | 2004-02-18 | ||
NO20040706A NO323785B1 (en) | 2004-02-18 | 2004-02-18 | Power Generation System |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005078233A1 true WO2005078233A1 (en) | 2005-08-25 |
Family
ID=34793431
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/NO2005/000060 WO2005078233A1 (en) | 2004-02-18 | 2005-02-18 | Power generation system |
Country Status (7)
Country | Link |
---|---|
AU (1) | AU2005213577B2 (en) |
BR (1) | BRPI0507831A (en) |
CA (1) | CA2556563C (en) |
GB (1) | GB2427227B (en) |
NO (1) | NO323785B1 (en) |
RU (1) | RU2361066C2 (en) |
WO (1) | WO2005078233A1 (en) |
Cited By (32)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008074995A1 (en) * | 2006-12-21 | 2008-06-26 | Geoprober Drilling Limited | Electrical power storage and pressurised fluid supply system |
WO2008147219A2 (en) | 2007-06-01 | 2008-12-04 | Fmc Kongsberg Subsea As | Subsea cooler |
EP2019524A2 (en) * | 2007-07-25 | 2009-01-28 | Vetco Gray Controls Limited | Electronics module |
WO2009122168A1 (en) * | 2008-04-04 | 2009-10-08 | Vetco Gray Controls Limited | Communication system for a hydrocarbon extraction plant |
WO2009136950A1 (en) * | 2008-05-09 | 2009-11-12 | Fmc Technologies Inc. | Method and apparatus for christmas tree condition monitoring |
EP2209175A1 (en) * | 2008-12-19 | 2010-07-21 | OpenHydro IP Limited | A method of installing a hydroelectric turbine generator |
US7845404B2 (en) | 2008-09-04 | 2010-12-07 | Fmc Technologies, Inc. | Optical sensing system for wellhead equipment |
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Also Published As
Publication number | Publication date |
---|---|
CA2556563A1 (en) | 2005-08-25 |
NO20040706D0 (en) | 2004-02-18 |
AU2005213577A1 (en) | 2005-08-25 |
NO20040706L (en) | 2005-08-19 |
GB2427227A (en) | 2006-12-20 |
NO323785B1 (en) | 2007-07-09 |
CA2556563C (en) | 2012-09-04 |
RU2361066C2 (en) | 2009-07-10 |
GB2427227B (en) | 2008-04-09 |
BRPI0507831A (en) | 2007-07-10 |
AU2005213577B2 (en) | 2010-09-30 |
RU2006131517A (en) | 2008-03-27 |
GB0617965D0 (en) | 2006-10-18 |
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