A subsurface formation monitoring system and method

Details A subsurface formation monitoring system and method A subsurface formation monitoring system and method

E - Fixed Constructions

21

B

E21B 47/12 (2006.01) E21B 17/00 (2006.01)

Patent

CA 2635101

A subsurface formation monitoring system comprises: - a conductive piping structure 2 comprising either a conductive casing or a non conductive casing fitted with a conductive tubing, the conductive piping being positioned within a borehole BH extending into the subsurface formation GF, - a surface installed power and communication module 3, and - a downhole installed conductive casing or tubing sub 4A, 4B, 4C comprising at least one sensor 5, 15 mounted on the sub, a data communication module 6 for wireless communication of the sensor measurements to the surface installed power and communication module, and a powering means 7 for providing power to the data communication module 6 and the sensor 5, 15. The surface installed power and communication module 3 is coupled to the conductive piping 2 and to a grounded return electrode 9 coupled to the subsurface formation GF, and comprises an alternate current generator 10 so as to define an ingoing signal path along the conductive piping 2 and sub 4A, 4B, 4C, the ingoing signal flowing from the surface installed power and communication module 3 to the downhole installed sub 4A, 4B, 4C, the ingoing signal transmitting power from the alternate current generator 10 to the downhole installed conductive casing or tubing sub 4A, 4B, 4C. A return signal comprising the sensor measurements is transmitted through a return signal path ACL flowing from the downhole installed sub 4A, 4B, 4C to the surface installed power and communication module 3 into the subsurface formation GF around the borehole BH.

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