Boring or penetrating the earth – Processes – Boring with specific fluid
Patent
1983-08-24
1985-08-13
Novosad, Stephen J.
Boring or penetrating the earth
Processes
Boring with specific fluid
175215, 175324, 175325, E21B 700, E21B 1700
Patent
active
045344264
ABSTRACT:
A packer and pressure differential drilling tool and method of controlled pressure balanced drilling in Big Hole well bores and shafts, characterized by a large diameter packer slideably engaged with the well bore over a drill bit and through which a dual drill pipe operates and isolates drilling fluid from a hydrostatic head of fluid standing in the well bore surrounding the dual drill pipe, the packer functioning as a non-rotatable ram slideable down the well bore and supporting said hydrostatic head and applying the weight thereof to the drill bit through anti-friction bearings, cuttings being flushed through the dual drill pipe by means of aerated drilling fluid or by an upwardly disposed jet pump, or both, so as to establish a reduced and/or underbalanced condition at the bit-to-bore bottom interface and operating the drill bit at an increased rate of penetration while maintaining a higher pressure condition in the well bore above the packer, the packer being weight set or hydraulic set, and the jet pump being centered in the dual drill pipe or disposed in the annulus of the dual drill pipe.
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Dang Hoang C.
Maxwell William H.
Novosad Stephen J.
Unique Oil Tools, Inc.
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