KICK WARNING SYSTEM USING HIGH FREQUENCY FLUID MODE IN A BOREHOLE
First Claim
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1. A method for detecting a kick in a borehole, comprising:
- acquiring a set of measurements with a sonic tool in the borehole;
determining borehole mud slowness from the set of measurements; and
comparing the mud slowness with a selected criterion, wherein the determining the mud slowness comprises determining fluid mode slowness as a function of frequency for at least one fluid mode, and determining the mud slowness from the fluid mode slowness.
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Abstract
Techniques for detecting a kick in a borehole include acquiring a set of measurements with a sonic tool in the borehole; determining borehole mud slowness from the set of measurements; and comparing the mud slowness with a selected criterion, wherein the determining the mud slowness includes determining fluid mode slowness as a function of frequency for at least one fluid mode, and determining the mud slowness from the fluid mode slowness.
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Citations
20 Claims
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1. A method for detecting a kick in a borehole, comprising:
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acquiring a set of measurements with a sonic tool in the borehole;
determining borehole mud slowness from the set of measurements; and
comparing the mud slowness with a selected criterion, wherein the determining the mud slowness comprises determining fluid mode slowness as a function of frequency for at least one fluid mode, and determining the mud slowness from the fluid mode slowness. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system for detecting a kick in a borehole, comprising:
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a sonic sensor configured to acquire a set of sonic measurements in the borehole; and
circuitry configured to determine borehole mud slowness from the set of sonic measurements and to compare the determined mud slowness with a selected criterion, wherein the mud slowness is determined from a fluid mode slowness derived from the set of sonic measurements. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A system for detecting a kick in a borehole, comprising:
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a sonic sensor configured to acquire a set of sonic measurements in the borehole;
processor means adapted to determine borehole mud slowness from the set of sonic measurements and to compare the determined mud slowness with a selected criterion, wherein the mud slowness is determined from a fluid mode slowness derived from the set of sonic measurements; and
the processor means configured to trigger a warning signal when the mud slowness exceeds the selected criterion. - View Dependent Claims (18, 19, 20)
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Specification