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Disponibilité de l'Abrégé et des Revendications

L'apparition de différences dans le texte et l'image des Revendications et de l'Abrégé dépend du moment auquel le document est publié. Les textes des Revendications et de l'Abrégé sont affichés :

  • lorsque la demande peut être examinée par le public;
  • lorsque le brevet est émis (délivrance).
(12) Brevet: (11) CA 2784582
(54) Titre français: PROCEDE ET APPAREIL POUR ETABLIR UNE COMMUNICATION FLUIDE ENTRE DES PUITS HORIZONTAUX
(54) Titre anglais: METHOD AND APPARATUS FOR ESTABLISHING FLUID COMMUNICATION BETWEEN HORIZONTAL WELLS
(51) Classification internationale des brevets (CIB):
  • E21B 43/12 (2006.01)
  • E21B 43/24 (2006.01)
  • E21B 43/30 (2006.01)
(72) Inventeurs (Pays):
  • NENNIGER, JOHN (Canada)
  • MELISSARI, BLAS (Uruguay)
  • KRAWCHUK, PAUL (Canada)
  • WIKSTON, JAMES (Canada)
  • GUNNEWIEK, LOWY (Canada)
(73) Titulaires (Pays):
  • N-SOLV CORPORATION (Canada)
(71) Demandeurs (Pays):
  • N-SOLV CORPORATION (Canada)
(74) Agent: PIASETZKI NENNIGER KVAS LLP
(45) Délivré: 2017-06-13
(22) Date de dépôt: 2012-08-01
(41) Mise à la disponibilité du public: 2014-02-01
Requête d’examen: 2016-01-13
(30) Licence disponible: S.O.
(30) Langue des documents déposés: Anglais

Abrégé français

Un procédé de démarrage dune paire de puits pour une RAH en établissant une communication fluidique entre les puits est décrit. Le procédé comprend les étapes qui consistent à fournir un système de livraison thermique à base de fluide dans chaque puits de ladite paire de puits, et de circulation dun fluide de démarrage de non-désasphaltage chauffé dans chaque puits à une première température. Par la suite, on applique une différence de pression entre les puits pour favoriser un déplacement de fluide de démarrage à travers une région dalésage entre puits, et on contrôle une viscosité du fluide de démarrage à travers un ou les deux par le contrôle de la température et de la concentration, pour favoriser de manière hydraulique le balayage de la région dalésage entre les puits, et on effectue une transition dun déplacement du fluide de démarrage à un processus dextraction dun fluide de travail.


Abrégé anglais

A method of starting up a well pair for EOR by establishing fluid communication between the wells is disclosed. The method includes the steps of providing a fluid based heat delivery system in each well of said well pair, and circulating a heated non-deasphalting start-up fluid in each well at a first temperature. Then, applying a pressure differential between the wells to encourage start-up fluid displacement across an inter well bore region, and controlling a viscosity of the start-up fluid through one or both of temperature and concentration control, to encourage hydraulically sweeping the inter well bore region, and transitioning from displacing the start-up fluid to a working fluid extraction process.


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

25

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE PROPERTY
OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A method of establishing fluid communication between a pair of vertically
spaced
apart generally horizontal wells located within a pay zone in an underground
hydrocarbon bearing reservoir, said method comprising the steps of:
providing a fluid based heat delivery system in each of said generally
horizontal wells;
circulating a heated displacement start-up fluid in each of said wells at a
first
temperature;
applying a pressure differential between said well bores to encourage start-
up fluid displacement across an inter well bore region from one of said wells
towards the other to encourage establishing fluid communication between said
well
pair;
controlling a viscosity of said start-up fluid through one or both of
temperature and concentration effects to encourage sweeping pay hydrocarbons
out of said inter well bore region to improve drainage through said inter well
bore
region; and
transitioning from displacing said start-up fluid to commencing a working
fluid extraction process using gravity drainage.
2. A method of establishing fluid communication between a pair of vertically
spaced
apart generally horizontal wells as claimed in claim 1 wherein said step of
controlling a viscosity of said start-up fluid further comprises continuing to
re-
circulate said start-up fluid at a second temperature, said second temperature

being lower than said first temperature to facilitate removal of pay
hydrocarbons
from an inter well bore region.

26

3. A method of establishing fluid communication between a pair of vertically
spaced
apart generally horizontal wells as claimed in claim 1 wherein said step of
controlling a viscosity of said start-up fluid further comprises allowing a
concentration of pay hydrocarbons to rise over time in said start-up fluid.
4. A method of establishing fluid communication between a pair of vertically
spaced
apart generally horizontal wells as claimed in claim 1 further including the
steps of
beginning to produce fluid from one of said wells while continuing to inject
start-up
fluid in the other of said wells to further displace pay hydrocarbons from the
inter
well bore region to establish a drainage path between said well pair.
5. A method of establishing fluid communication between a pair of vertically
spaced
apart generally horizontal wells as claimed in claim 1 further including the
step of
placing a downhole heater in at least one of said wells of said well pair to
provide
a passive pre-heat step before said start-up fluid is circulated.
6. A method of establishing fluid communication between a pair of vertically
spaced
apart generally horizontal wells as claimed in claim 5 wherein said downhole
heater is an electrical resistance heater that extends substantially along a
length
of one or both of said wells.
7. A method of establishing fluid communication between a pair of vertically
spaced
apart generally horizontal wells as claimed in claim 6 wherein said downhole
heater is energized while said start-up fluid is being circulated.

27

8. A method of establishing fluid communication between a pair of vertically
spaced
apart generally horizontal wells as claimed in claim 7 wherein said downhole
heater is energized while surface facilities to circulate said start-up fluid
are being
built.
9. A method of establishing fluid communication between a pair of vertically
spaced
apart generally horizontal wells as claimed in claim 1 further comprising the
pre-
treatment step of cleaning said wells to remove potential contaminants from
said
wells.
10.A method of establishing fluid communication between a pair of vertically
spaced
apart generally horizontal wells as claimed in claim 9 wherein said cleaning
step
includes using a gas to remove said contaminants.
11.A method of establishing fluid communication between a pair of vertically
spaced
apart generally horizontal wells as claimed in claim 10 wherein said gas is
CO2.
12.A method of establishing fluid communication between a pair of vertically
spaced
apart generally horizontal wells as claimed in claim 1 wherein said step of
providing
a start-up fluid circulation system that includes positioning coil tubing
within each
of said wells.
13.A method of establishing fluid communication between a pair of generally
vertically
spaced generally horizontal wells as claimed in claim 12 wherein said step of
positioning said coil tubing includes providing an injector tubing that
extends

28

generally towards a toe of each well and a return tubing which extends
generally
to a heel of each well so that said start-up fluid may be circulated from the
toe to
the heel within each of said wells.
14.A method of establishing fluid communication between a pair of generally
vertically
spaced apart generally horizontal wells as claimed in claim 1 further
including
positioning a supply of start-up fluid, a heat exchanger, and a power supply,
and a
pump at a well head for said pair of wells.
15.A method of establishing fluid communication between a pair of generally
vertically
spaced generally horizontal wells as claimed in claim 1 wherein said start-up
fluid
is a generally non-deasphalting hydrocarbon liquid.
16. A method of establishing fluid communication between a pair of generally
vertically
spaced generally horizontal wells as claimed in claim 15 wherein said
hydrocarbon
liquid is one of the group of synthetic crude oil, diesel, kerosene, jet fuel,

conventional crude, and other liquid hydrocarbons.
17.A method of establishing fluid communication between a pair of generally
vertically
spaced generally horizontal wells as claimed in claim 1 wherein said step of
heating said start-up fluid comprises heating said fluid above grade in a
heater.
18.A method of establishing fluid communication between a pair of generally
vertically
spaced generally horizontal wells as claimed in claim 1 wherein said step of

29

applying a pressure differential further includes the step of applying
pressure to
one of said wells.
19.A method of establishing fluid communication between a pair of generally
vertically
spaced generally horizontal wells as claimed in claim 18 wherein said one well
is
the upper well in the well pair.
20.A method of establishing fluid communication between a pair of generally
vertically
spaced generally horizontal wells as claimed in claim 1 wherein said step of
applying a pressure differential includes reducing the pressure in one of said
wells
to below a pressure in the other of said wells.
21.A method of establishing fluid communication between a pair of generally
vertically
spaced generally horizontal wells as claimed in claim 20 wherein said step of
reducing the pressure in one of said wells comprises reducing the pressure in
the
lower of the two wells in the well pair.
22.A method of establishing fluid communication between a pair of generally
vertically
spaced generally horizontal wells as claimed in claim 1 wherein the step of
applying a pressure differential between said wells includes the steps of
increasing
the pressure in the upper of said two wells and reducing the pressure in the
lower
of said two wells to apply a pressure difference between said two wells
without
exceeding a preferred maximum pressure in said reservoir in said pressurized
well.

30

23.A method of establishing fluid communication between a pair of generally
vertically
spaced generally horizontal wells as claimed in claim 1 wherein said first
temperature is in a range of between 60C and 180C.
24.A method of establishing fluid communication between a pair of generally
vertical
spaced generally horizontal wells as claimed in claim 2 wherein said second
temperature is in the range of 25C to 60C.
25.A method of establishing fluid communication between a pair of generally
vertically
spaced generally horizontal wells as claimed in claim 1 wherein a centerline
exists
between said two wells spaced generally equally from each well, and said
heating
circulating step is carried on until said pay zone at said center line is
heated to a
pay hydrocarbon displacement temperature.
26.A method of establishing fluid communication between a pair of generally
vertically
spaced generally horizontal wells as claimed in claim 25 wherein said pay
hydrocarbon displacement temperature at the centerline between the horizontal
wells is between 40C and 70C.
27.A method of establishing fluid communication between a pair of generally
vertically
spaced generally horizontal wells as claimed in claim 26 wherein said pay
hydrocarbon displacement temperature is about 60C.
28. A start-up method for a pair of vertically offset horizontal wells located
within a
hydrocarbon bearing reservoir, the start-up method comprising the steps of:

31

circulating, within each well, a heated start-up fluid to heat at least an
inter
well bore region by conduction;
applying a pressure differential between said well bores to encourage said
heated start-up fluid to displace across said inter well bore region to
further heat
said inter well bore region and hydro mechanically displace pay hydrocarbons;
and
increasing a viscosity of said start-up fluid over time to reduce short
circuiting of said start-up fluid through more permeable portions of said
inter well
bore region.
29.A start-up method as claimed in claim 28 wherein said vertically offset
horizontal
wells are less than 6.5 meters apart.
30.A start-up method as claimed in claim 28 wherein said vertically offset
horizontal
wells are less than 5.5 meters apart.
31.A start-up method as claimed in claim 28 wherein said vertically offset
horizontal
wells are about 4.5 meters apart.
32.A start-up method as claimed in claim 28 wherein said start-up fluid is a
displacement fluid to sweep out hydrocarbons from between said well pair.
33.A start-up method as claimed in claim 28 and 32 wherein said step of
increasing
said viscosity of said start-up fluid over time comprises reducing said
temperature
of the start-up fluid towards a preferred operating temperature for a
subsequent
formation treatment.


32

34. The start-up method of claim 28 and 32 wherein said step of increasing the

viscosity of said start-up fluid over time further comprises increasing a
concentration of pay hydrocarbons in said start-up fluid over time.
35. The start-up method of claim 28 and 32 wherein said step of increasing the

viscosity of said start-up fluid over time further comprises lowering the re-
circulation temperature of the start-up fluid over time.
36.A start-up method as claimed in claim 28 further including the steps of
beginning
to produce fluid from one of said wells while continuing to inject start-up
fluid in the
other of said wells to further displace pay hydrocarbons from the inter well
bore
region to establish drainage between said well pair.
37.A start-up method as claimed in claim 28 further including the step of
placing a
downhole heater in at least one of said wells of said well pair to provide a
passive
pre-heat step before said start-up fluid is circulated.
38.A start-up method as claimed in claim 37 wherein said downhole heater is an

electrical resistance heater that extends substantially along a length of one
or both
of said wells.
39.A start-up method as claimed in claim 38 wherein said downhole heater is
energized while said start-up fluid is being circulated.

33

40.A start-up method as claimed in claim 38 wherein said downhole heater is
energized while surface facilities to circulate said start-up fluid are being
built.
41.A start-up method as claimed in claim 28 further comprising the pre-
treatment step
of cleaning said wells to remove potential contaminants from said wells.
42.A start-up method as claimed in claim 41 wherein said cleaning step
includes using
a gas to remove said contaminants.
43.A start-up method as claimed in claim 42 wherein said gas is CO2.
44.A start-up method as claimed in claim 28 wherein said step of providing a
start-up
fluid circulation system that includes positioning coil tubing within each of
said
wells.
45.A start-up method as claimed in claim 44 wherein said step of positioning
said coil
tubing includes providing an injector tubing that extends generally towards a
toe of
each well and a return tubing which extends generally to a heel of each well
so
that said start-up fluid may be circulated from the toe to the heel within
each of
said wells.
46.A start-up method as claimed in claim 28 further including positioning a
supply of
start-up fluid, a heat exchanger, and a power supply, and a pump at a well
head
for said pair of wells.

34

47.A start-up method as claimed in claim 28 wherein said step of heating said
start-
up fluid includes the step of selecting a generally non-deasphalting
hydrocarbon
liquid as said start-up fluid to deliver heat.
48.A start-up method as claimed in claim 47 wherein said hydrocarbon liquid is
one
of the group of synthetic crude oil, diesel, kerosene, jet fuel, conventional
crude,
and other liquid hydrocarbons.
49.A start-up method as claimed in claim 28 further comprising the step of
heating
said start-up fluid above grade in a heater.
50.A start-up method as claimed in claim 28 wherein said step of applying a
pressure
differential further includes the step of applying pressure to one of said
wells.
51.A start-up method as claimed in claim 50 wherein said one well is the upper
well
in the well pair.
52.A start-up method as claimed in claim 50 wherein said step of applying a
pressure
differential includes reducing the pressure in one of said wells to below
reservoir
pressure.

35

53.A start-up method as claimed in claim 52 wherein said step of reducing the
pressure in one of said wells comprises reducing the pressure in the lower of
the
two wells in the well pair.
54.A start-up method as claimed in claim 28 wherein the step of applying a
pressure
differential between said wells includes the steps of increasing the pressure
in the
upper of said two wells and reducing the pressure in the lower of said two
wells to
apply a pressure difference between said two wells without exceeding a
preferred
maximum pressure in said reservoir, in said pressurized well.
55.A start-up method as claimed in claim 28 wherein wherein said start-up
fluid is
heated a range of between 60C and 180C
56.A start-up method as claimed in claim 55 wherein said start-up fluid is
reduced
over time to within a range of 25C to 60C.
57.A start-up method as claimed in claim 28 wherein a centerline exists
between said
two wells spaced generally equally from each well, and said heating
circulating
step is carried on until said pay zone at said center line is heated to a pay
hydrocarbon displacement temperature.
58.A start-up method as claimed in claim 57 wherein said pay hydrocarbon
displacement temperature at the centerline between the horizontal wells is
between 400 and 70C.

36

59.A start-up method as claimed in claim 57 wherein said pay hydrocarbon
displacement temperature is about 60C.
60. The start-up method of claim 28 further including the pretreatment step of
removing
any free water from said wells that might be present before the displacement
start-
up fluid is circulated.
61. The start-up method of claim 28 further including the step of establishing
a center
line temperature between said wells, by controlling one or both of a
temperature
and circulation rate of said displacement start-up fluid to achieve a desired
temperature range for operation of a following working fluid extraction
process.
62. The start-up method of claim 28 wherein said step of controlling a
viscosity of said
start-up fluid comprises increasing a viscosity of said start-up fluid to
between 10
cp and 1000 cp.
63. The start-up method as claimed in claims 18 or 50 wherein said pressure
differential is applied in the same direction as gravity.
64. The start-up method as claimed in claims 13 or 45 wherein said start-up
fluid is
injected at locations other than said toe and withdrawn from other locations
than
said heel.
65. The start-up method as claimed in any one of claims 18 to 22 and 50 to 54
wherein
said step of increasing said pressure differential includes speeding up a rate
of

37

displacement of the start-up fluid and said pay hydrocarbons from said inter
well
bore area as compared to a rate of displacement with no pressure differential.
66. The method of establishing fluid communication between a pair of
vertically spaced
apart generally horizontal well as claimed in claim 1 further including the
pretreatment step of removing any free water from said wells that might be
present
before the displacement start-up fluid is circulated.
67 The method of establishing fluid communication between a pair of vertically
spaced
apart generally horizontal well as claimed in claim 1 further including the
step of
establishing a center line temperature between said wells, by controlling one
or
both of a temperature and circulation rate of said displacement start-up fluid
to
achieve a desired temperature range for operation of a following working fluid

extraction process.
68. The method of establishing fluid communication between a pair of
vertically spaced
apart generally horizontal well as claimed in claim 1 wherein said step of
controlling
a viscosity of said start-up fluid comprises increasing a viscosity of said
start-up
fluid to between 10 cp and 1000 cp.
69. The method of establishing fluid communication between a pair of
vertically spaced
apart generally horizontal well as claimed in claims 18 or 50 wherein said
pressure
differential is applied in the same direction as gravity.
70. The method of establishing fluid communication between a pair of
vertically spaced
apart generally horizontal well as claimed in claims 13 or 45 wherein said
start-up

38

fluid is injected at locations other than said toe and withdrawn from other
locations
than said heel.
71. The method of establishing fluid communication between a pair of
vertically spaced
apart generally horizontal well as claimed in any one of claims 18 to 22 and
50 to
54 wherein said step of increasing said pressure differential includes
speeding up
a rate of displacement of the start-up fluid and said pay hydrocarbons from
said
inter well bore area as compared to a rate of displacement with no pressure
differential.


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

Pour une meilleure compréhension de l’état de la demande ou brevet qui figure sur cette page, la rubrique Mise en garde , et les descriptions de Brevet , États administratifs , Taxes périodiques et Historique des paiements devraient être consultées.

États admin

Titre Date
(22) Dépôt 2012-08-01
(41) Mise à la disponibilité du public 2014-02-01
Requête d'examen 2016-01-13
(45) Délivré 2017-06-13

Taxes périodiques

Description Date Montant
Dernier paiement 2018-07-26 200,00 $
Prochain paiement si taxe applicable aux petites entités 2019-08-01 100,00 $
Prochain paiement si taxe générale 2019-08-01 200,00 $

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 :

  • taxe de rétablissement prévue à l’article 7 de l’annexe II des Règles sur les brevets ;
  • taxe pour paiement en souffrance prévue à l’article 22.1 de l’annexe II des Règles sur les brevets ; ou
  • 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 $ 2012-08-01
Taxe périodique - Demande - nouvelle loi 2 2014-08-01 100,00 $ 2014-07-07
Taxe périodique - Demande - nouvelle loi 3 2015-08-03 100,00 $ 2015-07-27
Requête d'examen 800,00 $ 2016-01-13
Taxe périodique - Demande - nouvelle loi 4 2016-08-01 100,00 $ 2016-07-11
Enregistrement de documents 100,00 $ 2017-02-15
Final 300,00 $ 2017-04-26
Taxe périodique - brevet - nouvelle loi 5 2017-08-01 200,00 $ 2017-07-12
Taxe périodique - brevet - nouvelle loi 6 2018-08-01 200,00 $ 2018-07-26

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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 2012-08-01 1 17
Description 2012-08-01 22 1 017
Revendications 2012-08-01 6 176
Dessins 2012-08-01 9 224
Dessins représentatifs 2014-01-06 1 15
Page couverture 2014-02-10 2 50
Revendications 2016-07-18 13 437
Dessins 2014-08-18 9 167
Description 2016-01-13 24 1 151
Revendications 2016-01-13 13 453
Dessins 2016-01-13 9 167
Revendications 2016-06-13 13 438
Description 2016-06-13 24 1 154
Revendications 2016-09-13 14 425
Taxes 2014-07-07 2 63
Poursuite-Amendment 2014-08-18 10 208
Taxes 2015-07-27 1 33
Poursuite-Amendment 2016-07-18 4 136
Poursuite-Amendment 2016-01-13 88 3 577
Poursuite-Amendment 2016-01-26 1 28
Poursuite-Amendment 2016-02-24 3 243
Poursuite-Amendment 2016-03-21 1 46
Poursuite-Amendment 2016-04-11 4 275
Poursuite-Amendment 2016-06-13 35 1 335
Poursuite-Amendment 2016-06-30 3 166
Poursuite-Amendment 2016-07-05 3 174
Taxes 2016-07-11 1 33
Poursuite-Amendment 2016-08-16 3 178
Poursuite-Amendment 2016-09-13 33 1 272
Correspondance 2017-04-26 1 44
Dessins représentatifs 2017-05-15 1 10
Page couverture 2017-05-15 1 48
Taxes 2017-07-12 1 33
Taxes 2018-07-26 1 33