Method and Apparatus for Fluid Influx Detection While Drilling
First Claim
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1. A method of detecting a presence of a second fluid from an earth formation into a borehole containing a first fluid, the method comprising:
- (a) conveying a logging tool into the borehole;
(b) irradiating the earth formation with a source thereof on the logging tool;
(c) measuring radiation resulting from interaction of the irradiation with nuclei in the borehole at at least one detector; and
(d) estimating from the measured radiation the presence of the second fluid in the borehole.
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Abstract
A C/O ratio is determined using measurements of inelastically scattered gamma rays with a pulsed neutron source. Combined with look-up tables, the C/O measurement is used as an indicator of formation fluid influx into wellbore such as gas kick.
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Citations
22 Claims
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1. A method of detecting a presence of a second fluid from an earth formation into a borehole containing a first fluid, the method comprising:
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(a) conveying a logging tool into the borehole;
(b) irradiating the earth formation with a source thereof on the logging tool;
(c) measuring radiation resulting from interaction of the irradiation with nuclei in the borehole at at least one detector; and
(d) estimating from the measured radiation the presence of the second fluid in the borehole. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus for detecting a presence of a second fluid from an earth formation into a borehole containing a first fluid, the apparatus comprising:
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(a) a logging tool configured to be conveyed into the borehole;
(b) a source of the radiation on the logging tool configured to irradiate the earth formation;
(c) at least one detector on the logging tool configured to measure radiation resulting from interaction of the irradiation with nuclei in the borehole; and
(d) a processor configured to estimate from the measured radiation the presence of the second fluid in the borehole. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A computer-readable medium for use with an apparatus for detecting a presence of a second fluid from an earth formation into a borehole containing a first fluid, the apparatus comprising:
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(a) a logging tool configured to be conveyed into the borehole;
(b) a source of the radiation on the logging tool configured to irradiate the earth formation; and
(c) at least one detector on the logging tool configured to measure radiation resulting from interaction of the irradiation with nuclei in the borehole;
the medium comprising instructions which enable a processor to;
(d) estimate from the measured radiation the presence of the second fluid in the borehole. - View Dependent Claims (22)
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Specification