Determination of point of entry of fluid into a cased borehole

Details Determination of point of entry of fluid into a cased borehole Determination of point of entry of fluid into a cased borehole

G - Physics

01

V

358/4

G01V 5/10 (2006.01) E21B 47/10 (2006.01) E21B 49/08 (2006.01)

Patent

CA 1282498

ABSTRACT A method is provided for identifying the point of entry of water cut production in a producing well utilizing a pulsed neutron well logging instrument and a fluid sample taker sized and adapted for passage through a production tubing string into a perforated producing interval of a cased well borehole. The steps of the method comprise moving a pulsed neutron well logging sonde along a longitudinal axis of a well borehole over a producing interval of a perforated cased borehole at a logging speed sufficiently slow to enable significant oxygen activation of fluid in the borehole; irradiating the fluids in the borehole with pulses of fast neutrons having sufficient energy to produce oxygen activation of the borehole region if oxygen is present therein; detecting gamma radiation induced in the borehole fluid by said irradiating step at two spaced distances from the position at which said irradiating step occurs and producing at least two count rate signals representa- tive thereof; combining said count rate signals and a signal representative of the logging speed of said sonde to derive a signal representative of the entry location and the flow rate of oxygen activated fluid past the two spaced detectors, and taking one borehole fluid sample in the interval between two spaced distances and determining the water cut in the sample, thereby resolving any ambiguity in the total flow rate in said interval due to entry of hydrocarbon or water cut along said interval.

551931

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