Drill with polycrystalline diamond drill blanks for soft, medium-hard and hard formations

Patent · Tue Feb 07 00:00:00 EST 1984

OSTI ID:6841088

Williamson, K E

A drill bit is disclosed for drilling boreholes in earth formations. The bit's cutting face is provided with cutter preforms composed of polycrystalline diamonds on a tungsten carbide substrate mounted in sets from the center of the bit's face to its periphery. The first set consists of one cutter preform at approximately the center of the cutting face. Each succeeding set has at least two preforms, all of which in a set are disposed at an equal radius from the bit's axis of rotation and are displaced from adjacent preforms in the same set by equal arcs around the axis, the cutting path of a set overlapping with that of the next set. The next to last set of preforms is mounted from a surface coinciding with a truncated cone having a relative angle to the bit's axis of rotation of about 33/sup 0/; the outermost preform set is disposed in or above the junk slots, with each preform mounted extending 90/sup 0/ relative to the axis of rotation and having its cutting portion extending above raised portions from the cutting face whereby they cut a circumference slightly larger than that of the bit's body. Four to six jets for drilling mud have outlets from the drilling face, each jet including a relatively narrow neck and flared mouth. Junk slots are defined by the raised portions, a first group of such portions in one embodiment being stepped inwardly to form off-sets adjacent the conical surface of the bit's face. A second group of portions in such embodiment which alternate with the first extend somewhat less outwardly than the bit's overall diameter and each has a length less than one-half of the length of those of the first group. The bit's overall diameter is approximately twice its length along the first group of raised portions.

• Assignee: EDB-84-105440
• Patent Number(s): US 4429755
• OSTI ID: 6841088
• Resource Relation: Patent Priority Date: Priority date Sep 1973, Germany, Federal Republic of (F.R. Germany); Other Information: PAT-APPL-237971
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
03 NATURAL GAS
DRILL BITS
DESIGN
WELL DRILLING
ROTARY DRILLS
CONFIGURATION
CUTTING TOOLS
CUTTINGS REMOVAL
DIAMONDS
EFFICIENCY
NOZZLES
PERFORMANCE
POLYCRYSTALS
SUBSTRATES
SUPPORTS
TUNGSTEN CARBIDES
CARBIDES
CARBON
CARBON COMPOUNDS
CRYSTALS
DRILLING
DRILLING EQUIPMENT
DRILLS
ELEMENTAL MINERALS
ELEMENTS
EQUIPMENT
MECHANICAL STRUCTURES
MINERALS
NONMETALS
REMOVAL
TOOLS
TRANSITION ELEMENT COMPOUNDS
TUNGSTEN COMPOUNDS
020300* - Petroleum- Drilling & Production
030300 - Natural Gas- Drilling
Production
& Processing