Boring or penetrating the earth – With above-ground means for handling drilling fluid or cutting – With tool shaft having plural passages for drilling fluid
Patent
1988-06-07
1989-07-04
Novosad, Stephen J.
Boring or penetrating the earth
With above-ground means for handling drilling fluid or cutting
With tool shaft having plural passages for drilling fluid
175 61, 175320, 175 38, 175 48, E21B 1718, E21B 704
Patent
active
048441821
ABSTRACT:
A borehole tool employs a drill string having a plurality of sections of drill pipe connected together for traversing a wellbore. Drilling fluid is circulated down the drill string and up the annulus between the drill string and the wellbore to transport entrained drill cuttings out of the wellbore. At least one section of double wall drill pipe with its outer wall perforated, is included in the drill string. Drilling fluid flow down the string into the section of double wall drill pipe is controlled to effect a desired degree of drilling fluid flow rate through the perforations in the outer wall of the double wall drill pipe section so as to provide a stirring action to the drill cuttings in the wellbore annulus and thereby improve the transport of entrained drill cuttings out of the wellbore in the circulating drilling fluid.
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"Advanced Technology", Offshore, Dec. 1987, p. 17, Author: L. A. LeBlanc.
"Increasing Penetration Rates with High-Pressure Mud", R. McNally, Petroleum Engineer, Dec. 1987, p. 46-47.
Hager Jr. George W.
McKillop Alexander J.
Mobil Oil Corporation
Novosad Stephen J.
Speciale Charles J.
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