Boring or penetrating the earth – Processes – Boring with specific fluid
Patent
1987-06-26
1989-08-01
Kisliuk, Bruce M.
Boring or penetrating the earth
Processes
Boring with specific fluid
175100, 175324, 175339, 175393, E21B 700, E21B 1060
Patent
active
048526673
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.
REFERENCES:
patent: 2946565 (1960-07-01), Williams
patent: 4022285 (1977-05-01), Frank
patent: 4223747 (1980-09-01), Marais
patent: 4372399 (1983-02-01), Cork
patent: 4475603 (1984-10-01), Hayatdavoudi
patent: 4488607 (1984-12-01), Hayatdavoudi et al.
patent: 4630691 (1986-12-01), Hooper
patent: 4633958 (1987-01-01), Mouton
patent: 4688650 (1987-08-01), Hayatdavoudi et al.
Streeter and Wylie, "Fluid Mechanics", 6th Edition, 1975, pp. 134-139.
Kisliuk Bruce M.
Total Compagnie Francaise des Petroles
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