Patent ID: 8245780

Claim:
A method of measuring fluid in-flow in a region of interest in a wellbore, comprising: a) deploying a fiber optic cable concurrently with placement of a downhole tubular; b) transmitting a light signal along the cable and receiving a reflected signal from the region of interest; and c) interpreting the received signal to obtain information about fluid flowing into or out of the wellbore in the region of interest; wherein step c) comprises: i) assessing amplitude and frequency spectra across an array of channels; ii) conditioning the received signal by removing at least a portion of the signal that is not related to flow; iii) assessing flow regimes across depths and times; iv) calculating axial flow/s within the wellbore using relationships for axial flow; and v) calculating flow into or out of the wellbore at one or more points using relationships for flow through an orifice.