Method for detecting inflow of fluid in a well while drilling and implementing device
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United States of America Patent
Stats
-
Apr 1, 2003
Grant Date -
N/A
app pub date -
Sep 10, 2001
filing date -
Dec 23, 1998
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A method for detecting inflow of fluid in a well while drilling, wherein the drilling is carried out using an installation including a hollow cylindrical drill string (3) wherein is injected fresh mud, a tubing (5) defining with the drill string (3) an annular space (7) through which the loaded mud rises; it involves continuously measuring a heat flow; then continuously calculating on the basis of the quantity the value of a characteristic representing a thermal equilibrium obtained in the absence of a fluid occurrence formation; and detecting variations in the characteristic, the variations representing a thermal imbalance, resulting from inflow of fluid in the well (1). The invention is particular by applicable in operating oil drilling installations particularly deep at sea.
First Claim
Other Claims data not available