EP0524952A1 - Systeme de commande et de controle de production d'hydrocarbures terrestre ou sous-marine - Google Patents

Systeme de commande et de controle de production d'hydrocarbures terrestre ou sous-marine

Info

Publication number
EP0524952A1
EP0524952A1 EP91905871A EP91905871A EP0524952A1 EP 0524952 A1 EP0524952 A1 EP 0524952A1 EP 91905871 A EP91905871 A EP 91905871A EP 91905871 A EP91905871 A EP 91905871A EP 0524952 A1 EP0524952 A1 EP 0524952A1
Authority
EP
European Patent Office
Prior art keywords
signals
power
supplied
control
subsea
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.)
Ceased
Application number
EP91905871A
Other languages
German (de)
English (en)
Inventor
Orland José FILHO DE PINHO
Jan Bjontegaard
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Braspetro Oil Services Co
Original Assignee
Braspetro Oil Services Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from NO901682A external-priority patent/NO901682D0/no
Application filed by Braspetro Oil Services Co filed Critical Braspetro Oil Services Co
Publication of EP0524952A1 publication Critical patent/EP0524952A1/fr
Ceased legal-status Critical Current

Links

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

Definitions

  • the present invention relates to a system for the control and monitoring of surface or subsea hydrocarbon production, comprising production equipment to which is supplied hydraulic power and electrical power and signals for the control of valves etc. and the monitoring of signals from sensors etc., respectively, said hydraulic power and electrical power and signals being supplied from a fixed or floating monitoring installation.
  • the invention relates to special signal and power transmission methods for usage in both subsea and surface located control and/or monitoring systems.
  • the power transmission method requires a device for storage of energy 5 which comprises a part of the system.
  • the energy transfer efficiency will be further increased by sending the power as square waves.
  • Such a power storing device which is in fact an accumulator when loaded, greatly improves the utilization of the power in the system. The latter is also another 0 significant advantage with the present signal/power transmission method.
  • Fig. 1 is a sketch illustrating a subsea oil production installation and a control and monitoring installation 35 having hydraulic and electrical connections therebetween.
  • Fig. 2 illustrates in more detail the equipment associated with the installation shown in Fig. 1.
  • Fig. 3 is a diagram illustrating the use of filters in connection with the power suply to the equipment.
  • Fig. 4A is a power/signal scematic diagram of a conventional system of signal/power frequency multiplexing.
  • Fig. 4B is a power/signal scematic diagram of an embodiment of the present signal/power time multiplexing technique.
  • Fig. 5 illustrates an embodiment of a solenoid arrangement and switch arrangement in matrix format.
  • the control of valves 5 etc. and the monitor ⁇ ing of signals from sensors 4 etc. is performed from a control room 2.
  • the control room 2 is usually manned and situated either at a nearby fixed or floating platform 2a onshore. Under many conditions, in particular at medium and large water depths, the power to operate the subsea valves 5 will be supplied through hydraulic fluids under pressure. The hydraulic energy is supplied through one or more hoses or pipes 3.
  • a control unit 1 is positioned locally at the subsea installation 1a to distribute pressure to or from actuators 13 which control the valves.
  • the control unit 1 also receives, magnifies and codes signals from the subsea installation 1a and transfer these to the control room 2.
  • the control unit 1 receives control signals from the control room 2 through a cable 3a which contains electrical conductors.
  • Control systems of the described type consist of a surface part and a subsea part connected by cables, see Fig. 2.
  • the subsea part 1a contains a control unit 1 which has an hydraulic section 6 and an electrical 7 section.
  • the hydraulic energy is supplied to the hydraulic section 6 where the hydraulic pressure is distributed to the different actuators 13 by opening and closing hydraulic valves.
  • the hydraulic valves are operated by electromagnets (hereafter referred to as solenoids) which are supplied by electrical signals from the electrical section.
  • conduits may be bundled in a single electro-hydraulic cable or in two or more separate cables.
  • the present invention provides a combination of three aspects which used together result in considerable ad ⁇ vantages relative to the control of subsea hydrocarbon production wells or other subsea production equipment.
  • the advantages involve reduced space requirements, reduced weight of the equipment, and a simpler and less expensive control system.
  • the present invention makes it possible to supply power at low voltages. This is an advantage, as all usual organic insulation materials tend to get saturated when in use in subsea environment. Low voltages can be transmitted even through saturated cables without excessive losses. Low voltages have the further advantages of reducing the risk of corrosion as compared to the usual systems.
  • the signals for control and monitoring are transmitted through the same cables as the electric power. This is achieved by sending the control signals in certain time intervals.
  • the method is called time multiplexing. In periods when no signal transmission is required an un-interrupted power supply can be maintained.
  • the electrical power received by the control unit is stored in an internal condensator. The result is that power pulses of sufficient high effect can be transferred to the solenoid valves, while the power supply through the cable can be transferred over time at a low voltage.
  • the consequence is that the power supply cables become redundant, as all power supply to the subsea electronics may be transmitted through the signal cables.
  • a pluraily of valves can be controlled via a single pair of conductors by transmitting several signals of different frequencies simultaneously.
  • the electric power is supplied on a low frequency.
  • the signals are transmitted by a so-called frequency multiplexing, whilst the power and signals are separated by so-called time multiplexing, whilst the power and signals are separated by so-called time multiplexing.
  • a third characteristic aspect of the invention constitute the solenoid valves in the subsea control unit located in matrix arrangement relative to the lines through which electric power will be supplied.
  • a control system based on the invention will comprise a subsea control unit 1 and two main computers 8 located in the control room 2 on the surface.
  • a cable 15 links the control unit 1 and one of the main computers 8 in the control room 2.
  • the main computer 8 is provided with a lockable panel from which the well actuators can be controlled and from which signal transmitters for pressure and temperature can be recorded.
  • the main computer is also provided with an interface to which a smaller computer of standard type may be connected for control and monitoring of signals via keyboard 8a and visual display unit 9.
  • the subsea control unit 1 may, according to the invention, comprise an electronic canister 7 containing microprocessor based electronics 16 for receiving, conditioning and transmitting signals. Signals from the control room 2 are transmitted via the signal cable 15 to the electronic canister 7 where the microprocessor based electronics interprets the signals in such a way that the electrical power stored in the capasitor 17a is directed to the desired solenoid valve 14 in order for the valve to trigger and open for the provision of hydraulic fluid and pressure.
  • the signals from the supplied electronical power are separated using a filter 11 in conjunction with the electronics power supply 9.
  • a filter 12 is also located on the surface unit. The power is converted to direct current and stored in a capacitor 17a.
  • the signal cable 15 conducts electric alternating current of a moderate voltage level, typically 24 volts.
  • a possible format of the alternating current in the cable is, according to the invention, an interval of low frequency current 13.
  • a typical frequency may be 50 Hz.
  • the power supply will be switched off and signals 14 transmitted on a somewhat higher frequency.
  • a typical value for frequency transmission may be in the range of 1000 to 1300 Hz.
  • the solenoid valves 14 in the subsea control unit 1 are triggered by power pulses to the valves solenoid 19.
  • the transfer of power to the solenoid 18 coils is by electronic switches 17, see Fig. 5, closing the circuit to the coils 18.
  • the connection between solenoids 19 and switches 17 are arranged in the form of a matrix such that two switches must be closed in order for the electric circuit to be completed. Every single solenoid has two associated switches.
  • the switches 17 are arranged in two groups. One of the solenoids leads 1-n corresponds to a first group of switches 1n-1nm. The other lead corresponds to the second group column of switches 1m-1nm. In this way only one selected pair of switches will close the circuit to one particular solenoid valve and to this only. The arrangement will reduce the necessary number of switches.
  • Fig. 5 there is also illustrated a typical solenoid arrengement, i.e. a solenoid 19 connected between a positive column driver and a negative row driver, with an arc suppressor diode connected therebetween.
  • a typical solenoid arrengement i.e. a solenoid 19 connected between a positive column driver and a negative row driver, with an arc suppressor diode connected therebetween.
  • the need for separate power supply cables is eliminated.
  • the power is supplied through the signal cables.
  • Several simultaneously signals may be transmitted through the same conductor by the use of frequency multiplexing.
  • Electric power may be transmitted through the same cables by the use of time multiplexing as compared to the signals.
  • the number of selector switches is reduced due to a matrix arrangement relative to the solenoid valves to which the power is to be supplied.
  • the present invention is different from other known techniques by the fact the the three above aspects are present simultaneously and are used for the control of especially subsea wells.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Organic Insulating Materials (AREA)
  • Earth Drilling (AREA)

Abstract

Cette invention se rapporte à un système de commande et de contrôle de production d'hydrocarbures terrestre ou sous-marine qui comprend un équipement de production (1a) alimenté en énergie hydraulique et électrique et en signaux servant respectivement à commander des vannes etc. et à controler des signaux émis par des détecteurs etc., lesdites énergies hydrauliques et électrique ainsi que les signaux étant fournis par une installation de contrôle (2a) fixe ou flottante, ledit système alimentant les unités électroniques sous-marines en énergie par l'intermédiaire de câbles de signaux (15) permettant la transmission simultanée de plusieurs signaux au moyen du même conducteur ou d'un couple de conducteurs. De plus, on réduit le nombre des commutateurs de sélection en disposant ces commutateurs dans une matrice par rapport aux soupapes à solénoïde (19) qu'on alimentera en énergie électrique.
EP91905871A 1990-04-17 1991-03-20 Systeme de commande et de controle de production d'hydrocarbures terrestre ou sous-marine Ceased EP0524952A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
NO901682 1990-04-17
NO901682A NO901682D0 (no) 1990-04-17 1990-04-17 Anordning ved overfoering av elektriske signaler og kraft ved styre- og/eller overvaakningssystemer.
CA002081624A CA2081624A1 (fr) 1990-04-17 1992-10-28 Systeme servant au controle et a la surveillance de la production d'hydrocarbures, en surface ou sous-marine

Publications (1)

Publication Number Publication Date
EP0524952A1 true EP0524952A1 (fr) 1993-02-03

Family

ID=25675621

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91905871A Ceased EP0524952A1 (fr) 1990-04-17 1991-03-20 Systeme de commande et de controle de production d'hydrocarbures terrestre ou sous-marine

Country Status (3)

Country Link
EP (1) EP0524952A1 (fr)
CA (1) CA2081624A1 (fr)
WO (1) WO1991016523A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9814114D0 (en) * 1998-07-01 1998-08-26 Abb Seatec Ltd Wells
GB2377003A (en) * 2001-06-25 2002-12-31 Abb Offshore Systems Ltd A valve arrangement actuated by electrical means having reduced cabling.
GB2435770B (en) * 2004-12-03 2010-05-05 Vetco Gray Scandinavia As Hybrid control system and method
GB201212591D0 (en) 2012-07-16 2012-08-29 Aker Subsea Ltd Subsea safety system

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3865142A (en) * 1970-05-19 1975-02-11 Fmc Corp Electric remote control system for underwater wells
US3708990A (en) * 1970-12-09 1973-01-09 Global Marine Inc Deep water drill pipe controlled manipulator
US4052703A (en) * 1975-05-05 1977-10-04 Automatic Terminal Information Systems, Inc. Intelligent multiplex system for subsurface wells
US4337829A (en) * 1979-04-05 1982-07-06 Tecnomare, S.P.A. Control system for subsea well-heads

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9116523A1 *

Also Published As

Publication number Publication date
CA2081624A1 (fr) 1994-04-29
WO1991016523A1 (fr) 1991-10-31

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