Axial return hammer

Patent · Tue Apr 09 04:00:00 EST 1985

OSTI ID:5406198

Willis, C A

A downhole hammer drill for use with a dual concentric tube drill pipe string is characterized by the use of pressurized air from the annular passageway of the pipe string to operate the hammer. The exhaust air from the hammer is conducted to the periphery of the bit face of the hammer drill, across the bit face, and then through one or more openings in the central portion of the bit face. The exhaust air with entrained cuttings and hole water is then channeled through the drill and into the central passageway of the pipe string, through which it is removed from the drilling area. In a preferred embodiment an injection sub is provided in the drill string uphole of the drill and a drill body which substantially fills the bore annulus is used to throttle the flow of water down the borehole annulus to the bit face. In this embodiment a head of water is maintained in the borehole annulus and this water cascades down around the hammer drill to prevent cuttings and fines from moving up the bore annulus.

• Assignee: Walker-Neer Manufacturing Co., Inc.
• Patent Number(s): US 4509606
• OSTI ID: 5406198
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
AIR
AIR FLOW
CLEANING
COMPRESSED AIR
COMPRESSED GASES
CUTTINGS REMOVAL
DRILL PIPES
DRILLING
DRILLING EQUIPMENT
DRILLS
EQUIPMENT
FLUID FLOW
FLUID MECHANICS
FLUIDS
GAS FLOW
GASES
LIQUID FLOW
MECHANICS
MOTORS
PERCUSSIVE DRILLS
PIPES
PNEUMATIC MOTORS
PNEUMATICS
REMOVAL
WELL DRILLING