Enhanced circulation drill bit

Patent · Tue Jun 16 00:00:00 EDT 1987

OSTI ID:6450758

Mc Cullough, D W

This patent describes an enhanced circulation drill bit adapted to be mounted at the end of a drill string for enhancing the removal of drill bit cuttings from the bottom of the borehole drilled, comprising: a drill body having a first body section adapted to be attached to a drill string and a second body section having mounted therewith a plurality of cone-type cutter; the first body section having a bore adapted to be in fluid communication with the bore of the drill string to receive drilling fluid flowing downwardly through drill string; the second body section having at least two passageways. Each of the passageways has a first and a second end opening. The passageways are in fluid communication with the bore of the first body section at the first end opening and the passageways extend through the second body section to a second end opening: flow response means mounted in first body section bore for intermittently opening and closing the passageways in response to the flow of fluid entering the upper body section bore in order to intermittently deliver concentrated high velocity flow outwardly of the second end of a passageway to the end of the borehole. This increases jet impact force and enhances cross circulation and removal of drill bit cuttings; the flow response means includes rotation mounted with the first body section bore for rotating therein in response to fluid entering; and pressure surge reflection means mounted with the bore of the first body section for substantially utilizing at least a portion of pressure surges within the bore created by a flow blocking means. This intermittently blocks flow to the passageways.

• Assignee: NOV-87-068050; EDB-87-130677
• Patent Number(s): US 4673045
• OSTI ID: 6450758
• Resource Relation: Patent File Date: Filed date 4 Aug 1986
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
03 NATURAL GAS
42 ENGINEERING
DRILL BITS
CUTTINGS REMOVAL
DESIGN
WELL DRILLING
BOREHOLES
CIRCULATING SYSTEMS
DRILL PIPES
DRILLING FLUIDS
FLOW BLOCKAGE
FLOW RATE
FLUID FLOW
NATURAL GAS WELLS
OIL WELLS
ROTATION
CAVITIES
DRILLING
DRILLING EQUIPMENT
EQUIPMENT
FLUIDS
MOTION
PIPES
REMOVAL
WELLS
020300* - Petroleum- Drilling & Production
030300 - Natural Gas- Drilling
Production
& Processing
420206 - Engineering- Mining & Drilling Equipment & Facilities- (1980-1989)