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Disponibilité de l'Abrégé et des Revendications

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(12) Demande de brevet: (11) CA 2812394
(54) Titre français: SYSTEME ET METHODE DE SURVEILLANCE DU TRAITEMENT DES SABLES BITUMINEUX
(54) Titre anglais: SYSTEM AND METHOD FOR CONTROLLING THE PROCESSING OF OIL SANDS
(51) Classification internationale des brevets (CIB):
  • E21B 43/00 (2006.01)
  • E21B 43/12 (2006.01)
  • E21B 43/24 (2006.01)
(72) Inventeurs (Pays):
  • SAGLI, JAN RICHARD (Norvège)
  • ASKE, ELVIRA MARIE BERGHEIM (Norvège)
  • PATEL, KALPESH (Canada)
(73) Titulaires (Pays):
  • STATOIL CANADA LIMITED (Canada)
(71) Demandeurs (Pays):
  • STATOIL CANADA LIMITED (Canada)
(74) Agent: MARKS & CLERK
(45) Délivré:
(22) Date de dépôt: 2013-03-14
(41) Mise à la disponibilité du public: 2013-09-14
(30) Licence disponible: S.O.
(30) Langue des documents déposés: Anglais

(30) Données de priorité de la demande:
Numéro de la demande Pays Date
PCT/EP2012/054490 Office Européen des Brevets (OEB) 2012-03-14

Abrégé anglais



Model predictive control (MPC) is implemented on a steam-assisted gravity
drainage
(SAGD) injector-producer well pair. MPC uses measurements and models to
predict
future well and reservoir behaviour and optimize the changes on the
manipulated
variables to keep the controlled variables at their targets and within given
constraints.


Note : Les revendications sont présentées dans la langue officielle dans laquelle elles ont été soumises.


25

CLAIMS:

1. A control system for a well pair extraction system in an oil sand
reservoir, the
well pair extraction system comprising an injection well for injecting fluid
into the
reservoir and a production well for outputting fluid from the reservoir, the
control system
comprising:
a central processor configured to:
receive measurements from at least one sensor within the well pair
extraction system, the at least one sensor measuring at least one control
variable of the well pair extraction system;
predict a future value of the at least one control variable by inputting the
measurements into a model of the well pair extraction system, the model being
dependent on the at least one control variables and at least one manipulated
variable which is adjustable to control the at least one control variable;
determine, based on the predicted future value of the at least one
control variable, whether the at least one manipulated variable for the well
pair
extraction system is to be changed, and
output any change to the at least one manipulated variable.
2. A control system according to claim 1, wherein the at least one control
variable
includes parameters of the injection well which are to be controlled by the
control
system.
3. A control system according to claim 2, wherein the at least one control
variable
comprises pressure within the injection well and/or rate of injection of fluid
into the
injection well.
4. A control system according to any one of the preceding claims, wherein
the at
least one control variable includes parameters of the production well which
are to be
controlled by the control system.
5. A control system according to claim 4, wherein the at least one control
variable
comprise at least one subcool within the production well, where the subcool is
defined
as:


26

Subcool = T sat - T,
where
T sat is a saturation temperature of the fluid within the production well at
production
pressure and
T i is the temperature at location i in the production well.
6. A control system according to claim 4 or claim 5, wherein the at least
one
control variable includes parameters of a pump for outputting fluid from the
production
well.
7. A control system according to any one of the preceding claims, wherein
the at
least one manipulated variable comprises a parameter of the production well
which is
adjustable to control the control variables.
8. A control system according to claim 7, wherein the extraction system
comprises
a pump for outputting fluid from the production well and the at least one
manipulated
variable includes speed of the pump.
9. A control system according to any one of the preceding claims, wherein
the at
least one manipulated variable comprises a parameter of the injection well
which is
adjustable to control the control variables.
10. A control system according to any one of the preceding claims, wherein
the
processor is further configured to input at least one limit associated with
the at least
one control variable.
11. A control system according to claim 10, wherein the at least one limit
is input by
an operator.
12. A control system according to claim 11, wherein the at least one limit
is the at
least one manipulated variable.
13. A control system according to claim 12, wherein the at least one
manipulated
variable is the limit for rate of the fluid injection.


27

14. A control system according to claim 13, wherein the injection well
comprises a
short string and a long string and wherein the at least one manipulated
variable is the
limit for rate of the fluid injection into one or both of the short and long
strings.
15. A control system according to any one of claims 10 to 14, wherein the
processor is configured to determine whether the at least one manipulated
variable is
to be changed by comparing the predicted values of the control variables with
the at
least one limit.
16. A control system according to any one of the preceding claims, further
comprising a subsidiary controller for controlling the at least one
manipulated variable
and wherein the central processor is configured to output any change to the
subsidiary
controller to implement the change.
17. A control system according to claim 16, wherein the subsidiary
controller is a
flow controller controlling a valve on an input to the extraction system.
18. A control system according to claim 16 or claim 17, wherein the
subsidiary
controller is a product controller controlling an output from the extraction
system.
19. A control system according to any one of the preceding claims, wherein
the
processor is configured to iteratively repeat the receiving, predicting,
determining and
outputting steps.
20. A control system according to any of the preceding claims, wherein the
model is
further dependent on at least one disturbance variable which disables the
processor
when activated or contributes to prediction of the at least one control
variable when
activated and wherein the processor is configured to:
determine whether the at least one disturbance variable is activated and
either cease outputting any change to the at least one manipulated variable
until the at least one disturbance variable is deactivated or a predetermined
time limit
has passed or
update the predicted of the future value of the at least one control variable
based on any effect from the disturbance variable.


28

21. A control system according to any one of the preceding claims, wherein
the
model comprises a plurality of empirical step response models.
22. A control system according to any one of the preceding claims, wherein
the
model comprises at least one logic relationship.
23. A control system according to any one of the preceding claims, wherein
the
central processor is configured to determine whether the at least one
manipulated
variable is to be changed by including the error for each predicted future
value of the at
least one control variable.
24. A control system according to claim 23, wherein said error is
determined by
comparing a current measurement for said at least one control variable with a
previously predicted future value for said at least one control variable at
that current
time.
25. Use of a control system according to any one of the preceding claims to
reduce
startup time after a circulation phase or a shut-down.
26. A well pair extraction system for an oil sand reservoir comprising:
an injection well for injecting fluid into the reservoir;
a production well for outputting fluid from the reservoir, and
a control system as defined in any one of claims 1 to 24.
27. An extraction system for an oil sand reservoir comprising:
a plurality of well pair extraction systems as defined in claim 26;
a source of one or more fluids connected to each of the plurality of well pair
extraction systems; and
an output connected to each of the plurality of well pair extraction systems.
28. An extraction system according to claim 27 further comprising a main
controller
connected to the control system for each well pair extraction system, the main

controller being configured to control production and fluid utilisation across
the
extraction system.


29

29. A method of controlling a well pair extraction system in an oil sand
reservoir, the
well pair extraction system comprising an injection well for injecting fluid
into the
reservoir and a production well for outputting fluid from the reservoir, the
method
comprising:
receiving measurements from at least one sensor within the well pair
extraction system, the at least one sensor measuring at least one control
variable of the well pair extraction system;
predicting a future value of the at least one control variable by inputting
the measurements into a model of the well pair extraction system, the model
being dependent on the at least one control variable and at least one
manipulated variable which is adjustable to control the control variables;
determining, based on the predicted future value of the at least one
control variable, whether the at least one manipulated variable for the well
pair
extraction system is to be changed, and
outputting any change to the at least one manipulated variable.
30. A carrier carrying computer program code to, when running, implement
the
method of claim 29.


Une figure unique qui représente un dessin illustrant l’invention.

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États admin

Titre Date
(22) Dépôt 2013-03-14
(41) Mise à la disponibilité du public 2013-09-14

Taxes périodiques

Description Date Montant
Dernier paiement 2017-03-06 100,00 $
Prochain paiement si taxe applicable aux petites entités 2018-03-14 100,00 $
Prochain paiement si taxe générale 2018-03-14 200,00 $

Avis : Si le paiement en totalité n’a pas été reçu au plus tard à la date indiquée, une taxe supplémentaire peut être imposée, soit une des taxes suivantes :

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  • surtaxe pour paiement en souffrance prévue aux articles 31 et 32 de l’annexe II des Règles sur les brevets.

Historique des paiements

Type de taxes Anniversaire Échéance Montant payé Date payée
Dépôt 400,00 $ 2013-03-14
Enregistrement de documents 100,00 $ 2013-06-06
Taxe périodique - Demande - nouvelle loi 2 2015-03-16 100,00 $ 2015-02-27
Taxe périodique - Demande - nouvelle loi 3 2016-03-14 100,00 $ 2016-03-09
Taxe périodique - Demande - nouvelle loi 4 2017-03-14 100,00 $ 2017-03-06

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Filtre Télécharger sélection en format PDF (archive Zip)
Description du
Document
Date
(yyyy-mm-dd)
Nombre de pages Taille de l’image (Ko)
Abrégé 2013-03-14 1 9
Description 2013-03-14 24 1 073
Revendications 2013-03-14 5 170
Dessins 2013-03-14 14 228
Dessins représentatifs 2013-09-23 1 9
Page couverture 2013-09-23 1 34
Poursuite-Amendment 2013-03-14 1 47
Correspondance 2013-06-06 1 25