Method of detecting a fluid influx which could lead to a blow-out during the drilling of a borehole
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United States of America Patent
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Jun 20, 1989
Grant Date -
N/A
app pub date -
Jul 8, 1988
filing date -
Jul 15, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
This invention is intended for use in the process of drilling an oil well and has to do with a process for the detection of fluid influx which could lead to a blow-out. This process consists of measuring the inlet flow rate A of the drilling mud coming into the well and the outlet flow rate B of the drilling mud rising from the well in order to arrive at the quantity: C=a.B-A where a is a scale factor the value of which can be altered so as to bring about a recalibration of the outlet rate measurement. Such recalibration is made each time the average value of C, in relation to a given period of time, reveals a significant difference between the rates, and an alarm is set off in accordance with the frequency of the recalibrations corresponding to an excess in the outlet rate in relation to the inlet rate.
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