Pressure relief process for well-drilling
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United States of America Patent
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-
Aug 1, 1989
Grant Date -
N/A
app pub date -
Jun 26, 1987
filing date -
Jul 2, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A drill string has a bulge equipped with a system of n injection ducts connecting the interior of the string surrounding annular space and opening upwardly into the space to divert a part of the drilling fluid supplied to the bit. This arrangement makes it possible to produce below the bulge a pressure decrease H markedly greater than 10 meters of water by setting the flow of drilling fluid in the system of injection ducts at a value, expressed in m.sup.3 /s, equal to approximately: .sqroot.10H.times.S.times.s33 n, S and s being the cross-sections, expressed in m.sup.2, respectively, of a part of the portion of the annular space included between the periphery of the bulge and the drill string and of the group of n injection ducts.
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