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1. (WO2019063972) METHOD OF CONTROLLING A WELL
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CLAIMS

1. A method of controlling a well in a geological structure, the well comprising:

a first casing string and a second casing string, the second casing string at least partially inside the first casing string;

the first casing string and the second casing string defining a first inter-casing annulus therebetween, the second casing string defining a second casing bore therewithin; and

a primary fluid flow control device in the second casing string to provide fluid communication between the first inter-casing annulus and the second casing bore; the method comprising the steps of:

drilling a borehole through at least a portion of the geological structure to reach the well, thus creating a relief well;

creating a fluid communication path through the first casing string to provide fluid communication between the relief well and the first inter-casing annulus of the well; introducing a fluid into the relief well and then into the first inter-casing annulus; and

opening the primary fluid flow control device and directing the fluid between the first inter-casing annulus and the second casing bore.

2. A method as claimed in claim 1 , wherein the relief well only penetrates the first casing string.

3. A method as claimed in any preceding claim, wherein the relief well contacts the first casing string at a depth of less than 2000 meters from the surface of the geological structure.

4. A method as claimed in any preceding claim, the method further including the step of:

transmitting a wireless signal through the well to open the primary fluid flow control device and direct the fluid between the first inter-casing annulus and the second casing bore.

5. A method as claimed in any preceding claim, the method further including the step of:

transmitting a wireless signal through the relief well and well to open the primary fluid flow control device and direct the fluid between the first inter-casing annulus and the second casing bore.

6. A method as claimed in claim 4 or 5, wherein the wireless communication is by means of at least one of an acoustic signal and electromagnetic signal.

7. A method as claimed in any preceding claim, wherein the primary fluid flow control device comprises a valve.

8. A method as claimed in claim 7, wherein the valve comprises a check valve.

9. A method as claimed in any preceding claim, wherein the primary fluid flow control device comprises a rupture mechanism.

10. A method as claimed in any preceding claim, wherein at least one of the primary and secondary fluid flow control devices includes a metal to metal seal.

1 1. A method as claimed in any preceding claim, the method further including the step of:

measuring at least one of pressure and density of the fluid in at least one of the first inter-casing annulus and second casing bore.

12. A method as claimed in any preceding claim, the method further including the step of:

measuring at least one of the pressure and density of the fluid in at least one of the first inter-casing annulus and second casing bore before opening the primary fluid flow control device and directing the fluid from the first inter-casing annulus into the second casing bore.

13. A method as claimed in claim 12, wherein the step of measuring at least one of the pressure and density includes transmitting pressure and/or density data to surface using wireless communication at least partially through the well.

14. A method as claimed in claim 13, wherein the wireless communication is by means of at least one of acoustic signals, electromagnetic signals and pressure pulses especially acoustic or electromagnetic signals

15. A method as claimed in any preceding claim, the well further comprising:

a third casing string defining a third casing bore therewithin, the second casing string and the third casing string defining a second inter-casing annulus therebetween; and

a secondary fluid flow control device in the third casing string to provide fluid communication between the second inter-casing annulus and the third casing bore; the method further including the step of:

opening the secondary fluid flow control device and directing the fluid between the second inter-casing annulus and the third casing bore.

16. A method as claimed in claim 15, wherein the third casing string is a liner.

17. A method as claimed in claim 15 or claim 16, the method further including the step of:

measuring pressure and density of the fluid in at least one of the second inter-casing annulus and third casing bore before opening the secondary fluid flow control device and directing the fluid from the second inter-casing annulus into the third casing bore.

18. A method as claimed in claim 17, wherein the step of measuring at least one of the pressure and density of the fluid includes transmitting pressure and/or density data to surface using wireless communication at least partially through the well.

19. A method as claimed in claim 18, wherein the wireless communication is by means of at least one of acoustic signals, electromagnetic signals and pressure pulses especially acoustic or electromagnetic signals.

20. A method as claimed in any preceding claim, wherein the step of creating a fluid communication path through the first casing string includes drilling through the first casing string, such that a fluid flow path is created between a first side of the first casing string and the first inter-casing annulus on a second side of the first casing string.

21. A method as claimed in any preceding claim, the well further comprising:

one or more sensors at one or more of a face of the geological structure, in the well, in an annulus, in a casing bore, in a production tubing, in any inner string;

the method further including the step of:

using data from the one or more sensors to optimise properties of the fluid that is directed between an annulus and a casing bore.

22. A method as claimed in any preceding claim, the well further comprising:

a transmitter, receiver or transceiver attached to at least one of the first and second casing string;

the method further including the step of:

communicating between the transmitter, receiver or transceiver attached to at least one of the first and second casing string and a transmitter, receiver or transceiver attached to a drill string being used to drill the relief well, to assist drilling the relief well towards the well.

23. A method as claimed in any preceding claim, the well further comprising:

a transmitter, receiver or transceiver in the relief well; and

the method further including the step of:

using the transmitter, receiver or transceiver in the relief well to at least partially wirelessly recover data from at least one of the well and relief well.

24. A method as claimed in any preceding claim, the well further comprising:

one or more sensors at one or more of a face of the geological structure, in the well, in an annulus, in a casing bore, in a production tubing, in any inner string;

the method further including the step of:

using data from the one or more sensors to optimise properties of the fluid that is directed between an annulus and a casing bore; and

wherein the data from the one or more sensors is transmitted wirelessly. .

25. A method as claimed in any preceding claim, the method further including the step of:

transmitting using wireless communication, an instruction through the well to close the primary fluid flow control device and restrict fluid flow between the first inter-casing annulus and the second casing bore.