Probe to specifically determine the injectivity of a...

G - Physics – 01 – V

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G01V 1/133 (2006.01) E21B 23/14 (2006.01) E21B 43/26 (2006.01) E21B 47/06 (2006.01) E21B 47/10 (2006.01) E21B 49/00 (2006.01) G01V 1/52 (2006.01)

Patent

CA 2063509

Probe to specifically determine the injectivity of a petroleum well and measuring method implementating said probe ABSTRACT OF THE DISCLOSURE During conventional injection tests conducted on petroleum operating wells, these operations have been effected up until now by measuring the hydraulic characteristic quantities of the fluid injected into the well (mainly pressure, temperature, flowrate). The present invention adds to microseismic measurements representative of the acoustic emission induced by injection. The present invention thus makes use of a probe constituted by a bucket chain mainly containing tubular cartridges interconnected by flexible cables with at least some of said cartridges housing means to measure the microseismic quantities representative of the acoustic emission induced by the injection of a fluid into the well, and wherein all the cartridges have a sufficiently small diameter so as to be engaged inside a pipe column disposed in the well. Parallel with this, the present invention makes use of a measurement method using this probe during an injection test comprising at least one period for injecting the fluid, followed by a rest period, the pipe column of the well comprising at least one perforation level, wherein the probe is lowered into the well and then is immobilized close to the perforation level so as to measure at least the microseismic quantities, preferably associated with hydraulic quantities, at least during the rest period. Apart from obtaining a more accurate picture of the injectivity of the well, the present invention thus concerns a test procedure much better adapted to actual requirements (via the modularity of the probe) and one which is much less cumbersome (the probe carrying out several measurements during a single to-and-fro movement in the well).

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