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(12) Demande de brevet: (11) CA 2889351
(54) Titre français: EQUIPEMENT DE FOND DE TROU A REGULATION DE PRESSION
(54) Titre anglais: PRESSURE REGULATED DOWNHOLE EQUIPMENT
(51) Classification internationale des brevets (CIB):
  • E21B 34/08 (2006.01)
  • E21B 43/12 (2006.01)
(72) Inventeurs (Pays):
  • MORRISON, JEFFREY (Etats-Unis d'Amérique)
(73) Titulaires (Pays):
  • WEATHERFORD TECHNOLOGY HOLDINGS, LLC (Etats-Unis d'Amérique)
(71) Demandeurs (Pays):
  • WEATHERFORD TECHNOLOGY HOLDINGS, LLC (Etats-Unis d'Amérique)
(74) Agent: DEETH WILLIAMS WALL LLP
(45) Délivré:
(22) Date de dépôt: 2015-04-27
(41) Mise à la disponibilité du public: 2015-10-28
Requête d’examen: 2015-04-27
(30) Licence disponible: S.O.
(30) Langue des documents déposés: Anglais

(30) Données de priorité de la demande:
Numéro de la demande Pays Date
61/985,159 Etats-Unis d'Amérique 2014-04-28

Abrégé anglais


Methods and apparatus are provided for regulating a pressure in a wellbore by
including multiple stages of pressure regulation in a casing to gradually
change the
pressure in the casing. For example, a method of regulating a pressure of a
fluid in a
wellbore includes positioning a tubular equipped with a first float assembly
having a
first unidirectional valve and a second float assembly having a second
unidirectional
valve, wherein each of the first and second unidirectional valves include an
inlet and
an outlet; and reducing a pressure differential across the first
unidirectional valve when
a pressure at the outlet is higher than a pressure at the inlet by a
predetermined
amount.


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

We claim:
1. A method of regulating a pressure of a fluid in a wellbore, comprising:
positioning a tubular equipped with a first float assembly and a second float
assembly, wherein each float assembly includes a unidirectional valve with an
inlet
and an outlet;
reaching a pressure differential between an upstream pressure and a
downstream pressure of the unidirectional valve of the first float assembly;
and
reducing the pressure differential across the unidirectional valve of the
first float
assembly when the downstream pressure is higher than the upstream pressure by
a
predetermined amount.
2. The method of claim 1, wherein reducing the pressure differential across
the
first unidirectional valve includes opening a relief valve to allow fluid to
move across
the first float assembly.
3. The method of claim 2, wherein the fluid flowing through the first float
assembly
pressurizes an area between the first and second float assemblies.
4. The method of claim 3, further comprising reducing a pressure
differential
across the second unidirectional valve when the pressure differential across
the
second unidirectional valve reaches a second predetermined pressure
differential.
5. The method of claim 2, wherein the relief valve closes when the pressure

differential is at or below the predetermined amount.
6. The method of claim 2, wherein the relief valve closes when the pressure

differential is below the predetermined amount of pressure differential.
7. The method of claim 2, wherein the relief valve remains open until the
pressure
differential is less than 80% of the predetermined amount of pressure
differential.

16

8. The method of claim 1, wherein reducing the pressure differential across
the
first unidirectional valve pressurizes an area between the first and second
float
assemblies.
9. The method of claim 8, further comprising reducing a pressure
differential
across the second unidirectional valve when the pressure differential across
the
second unidirectional valve reaches a second predetermined pressure
differential.
10. The method of claim 1, wherein reducing the pressure differential
across the
first unidirectional valve includes moving the first float assembly toward the
second
float assembly.
11. The method of claim 10, wherein moving the first float assembly
pressurizes an
area between the first and second float assemblies.
12. The method of claim 11, further comprising reducing a pressure
differential
across the second unidirectional valve when the pressure differential across
the
second unidirectional valve reaches a second predetermined pressure
differential.
13. A system for regulating a pressure of a fluid in a wellbore,
comprising:
a tubular;
a first float assembly disposed in the tubular, wherein the first float
assembly
includes a first unidirectional valve for allowing fluid to flow in a first
direction;
a second float assembly disposed in the tubular, wherein the second float
assembly includes a second unidirectional valve for allowing fluid to flow in
the first
direction;
wherein the first float assembly is equipped with a pressure regulating device

configured to actuate when a predetermined pressure differential is reached.

17

14. The system of claim 13, wherein the pressure regulating device includes
a relief
valve for allowing fluid to flow in a second direction.
15. The system of claim 13, wherein the pressure regulating device includes
a
movable first float assembly.
16. The system of claim 13, further comprising a first plug and a second
plug,
wherein the first plug includes a removable seal.
17. The system of claim 16, wherein the removable seal includes a rupture
disc.
18. A method of regulating a pressure of a fluid in a wellbore, comprising:
positioning a tubular equipped with a first float assembly having a first
unidirectional valve and a second float assembly having a second
unidirectional valve
in a wellbore, wherein each of the first and second unidirectional valves
include an
inlet and an outlet; and
reducing a pressure differential across the first unidirectional valve when a
pressure at the outlet of the first unidirectional valve is higher than a
pressure at the
inlet of the second unidirectional valve by a predetermined amount.
19. The method of claim 18, wherein reducing the pressure differential
across the
first unidirectional valve includes opening a relief valve to allow fluid to
move across
the first float assembly.
20. The method of claim 19, further comprising reducing a pressure
differential
across the second unidirectional valve when a pressure at the outlet is higher
than a
pressure at the inlet by a predetermined second amount.
21. The method of claim 18, wherein reducing the pressure differential
across the
first unidirectional valve pressurizes an area between the first and second
float
assemblies.

18

22. The method of claim 21, further comprising reducing a pressure
differential
across the second unidirectional valve when a pressure at the outlet of the
second
unidirectional valve is higher than a pressure at the inlet of the second
unidirectional
valve by a predetermined second amount.
23. The method of claim 18, wherein reducing the pressure differential
across the
first unidirectional valve includes moving the first float assembly toward the
second
float assembly.
24. The method of claim 23, wherein moving the first float assembly
pressurizes an
area between the first and second float assemblies.
25. The method of claim 24, further comprising reducing a pressure
differential
across the second unidirectional valve when a pressure at the outlet of the
second
unidirectional valve is higher than a pressure at the inlet of the second
unidirectional
valve by a predetermined second amount.

19


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 2015-04-27
Requête d'examen 2015-04-27
(41) Mise à la disponibilité du public 2015-10-28

Taxes périodiques

Description Date Montant
Dernier paiement 2017-03-24 100,00 $
Prochain paiement si taxe applicable aux petites entités 2018-04-27 50,00 $
Prochain paiement si taxe générale 2018-04-27 100,00 $

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
Requête d'examen 800,00 $ 2015-04-27
Dépôt 400,00 $ 2015-04-27
Taxe périodique - Demande - nouvelle loi 2 2017-04-27 100,00 $ 2017-03-24

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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)
Page couverture 2015-11-03 1 48
Abrégé 2015-04-27 1 18
Description 2015-04-27 15 764
Revendications 2015-04-27 4 137
Dessins 2015-04-27 3 114
Dessins représentatifs 2015-10-05 1 17
Revendications 2016-09-08 4 137
Poursuite-Amendment 2016-03-17 4 235
Poursuite-Amendment 2017-01-18 3 175
Poursuite-Amendment 2016-09-08 10 367
Taxes 2017-03-24 1 39
Poursuite-Amendment 2017-06-28 9 322
Revendications 2017-06-28 3 111
Abrégé 2017-10-05 1 17