Pressure integrity testing system

1. An annular barrier system for proving testable annular barriers arranged between a first metal casing or borehole and a fixed second metal casing being fixed within the borehole, the second metal casing having an outer face, the annular barrier system comprising:

a first annular barrier and a second annular barrier, each barrier comprising:

a tubular part made of metal extending in a longitudinal direction for mounting as part of the fixed second metal casing,

an expandable metal sleeve surrounding and being connected with the tubular part and defining an annular barrier space, and

a first fluid passage in the tubular part for letting fluid into the annular barrier space to expand the sleeve, and

the annular barrier system further comprising a sensor arranged in connection with the tubular part, and when the expandable sleeves are expanded to abut the first metal casing or borehole, a first annular space is defined between the annular barriers, wherein the sensor is arranged to determine a condition of the first annular space in order to test the isolation ability of at least one of the annular barriers.

2. An annular barrier system according to claim 1 , wherein the sensor measures a property of the fluid to determine the condition of the annular space, the property being a temperature, a pressure, a presence of gas or a presence of a chemical tracer.

3. An annular barrier system according to claim 1 , wherein the sensor is arranged in the annular space.

4. An annular barrier system according to claim 1 , wherein the sensor is arranged in at least one of the annular barriers or is connected with at least one of the annular barriers.

5. An annular barrier system according to claim 1 , wherein the sensor is arranged on an outer face of the expandable sleeve.

6. An annular barrier system according to claim 1 , further comprising a readout unit arranged at the outer face of the tubular part and in electrical communication with the sensor.

7. An annular barrier system according to claim 1 , further comprising a first communication unit arranged at the outer face of the tubular part of the first or second annular barrier for communicating data from the sensor to a reader.

8. An annular barrier system according to claim 7 , wherein the first communication unit is arranged in a first annulus which is arranged between the second metal casing and the first metal casing or the borehole.

9. An annular barrier system according to claim 7 , wherein the communication unit comprises a wireless sending unit sending data from the communication unit to the reader via inductance, Wlan, zigbee, or radio frequency.

10. An annular barrier system according to claim 1 , further comprising a gas chamber having an outlet being in fluid communication with the annular space when a valve arranged in the outlet is opened for letting gas inside the gas chamber and into the annular space.

11. An annular barrier system according to claim 1 , wherein the annular space is at least partly filled with cement.

12. An annular barrier system according to claim 1 , further comprising:

the second metal casing,

a third metal casing arranged inside the second metal casing,

a third annular barrier and fourth annular barrier, a tubular part of each of the third and fourth annular barrier extending in a longitudinal direction for mounting as part of the third metal casing, and

a second sensor arranged in connection with the tubular part of the third or the fourth annular barrier, and when the expandable sleeves of the third and fourth annular barriers are expanded to abut the second metal casing, a second annular space is defined between the third and fourth annular barriers, wherein the second sensor is arranged to determine a condition of the second annular space in order to test the isolation ability of at least one of the third or fourth annular barriers.

13. An annular barrier system according to claim 12 , further comprising a second communication unit connected with the third metal casing and/or the second sensor to receive information from the sensor arranged for determining a condition of the first annular space.

14. An annular barrier system according to claim 13 , wherein the second communication unit is arranged in a second annulus which is arranged between the second metal casing and the third metal casing.

15. An annular barrier system according to claim 12 , further comprising:

a fourth metal casing arranged inside the third metal casing,

a fifth annular barrier and sixth annular barrier, the tubular part of the fifth and sixth annular barrier extending in a longitudinal direction for mounting as part of the fourth metal casing, and

a third sensor arranged in connection with the tubular part, and when the expandable sleeves of the fifth and sixth annular barriers are expanded to abut the third metal casing, a third annular space is defined between the fifth and sixth annular barriers, wherein the third sensor is arranged to determine a condition of the third annular space in order to test the isolation ability of at least one of the fifth and sixth annular barriers.

16. An annular barrier system according to claim 15 , further comprising a third communication unit connected with the fourth metal casing and/or a third sensor to receive information from the second sensor arranged for determining a condition of the second annular space.

17. An annular barrier system according to claim 16 , wherein the third communication unit is arranged in a third annulus which is arranged between the second metal casing and the third metal casing.

18. A method of testing a pressure integrity of a well using a system according to claim 1 , the method comprising:

expanding the expandable sleeves of the first and second annular barriers, thereby providing the first annular space,

creating an increased property of the fluid in the first annular space, and

measuring the property by the sensor.

19. A method according to claim 18 , further comprising lowering a tool comprising the sensor into the well to measure the property of the fluid in the annular space.