Packer weighted and pressure differential method and apparatus for big hole drilling

Patent · Tue Aug 13 00:00:00 EDT 1985

OSTI ID:6418965

Hooper, D W

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.

• Assignee: Unique Oil Tools, Inc.
• Patent Number(s): US 4534426
• OSTI ID: 6418965
• Resource Relation: Patent File Date: Filed date 24 Aug 1983; Other Information: PAT-APPL-525998
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
03 NATURAL GAS
ROTARY DRILLS
DESIGN
HYDRAULICS
PACKINGS
PRESSURE CONTROL
DIMENSIONS
DRILL BITS
DRILL PIPES
DRILLING FLUIDS
PUMPS
ROTARY DRILLING
WEIGHT
WELL DRILLING
CONTROL
DRILLING
DRILLING EQUIPMENT
DRILLS
EQUIPMENT
FLUID MECHANICS
FLUIDS
MECHANICS
PIPES
020300* - Petroleum- Drilling & Production
030300 - Natural Gas- Drilling
Production
& Processing