摘要:
An improved disc-shaped cutting element including first and second major flat surfaces and a cutting edge, said element comprised of a hard metal substrate defining an irregular interface bonded to a polycrystalline diamond, where said interface includes a plurality of concentric and redial grooves adapted to receive corresponding protrusions formed on the diamond layer so as to enhance wear like and impact resistance.
摘要:
Subterranean drill bits and particularly to nozzle features to be incorporated in subterranean bits. In one embodiment, the nozzle assembly of the invention defines a wear resistant structure which extends upstream from the terminus of the transition area. In another embodiment, nozzle assemblies are arranged about the transition area at low angles so as to minimize flow turbulence.
摘要:
A novel cutting element is disclosed as comprised of at an attachment body and a cutting face, where said attachment body is attached to said cutting face via a high temperature braze joint, the attachment body defining a projection and a grooved area, where said grooved area is disposed between the projection and the cutting face, the resultant cutting element providing both enhanced wear characteristics and stability.
摘要:
An improved bi-center bit with improved directional stability and wear resistance is disclosed, which bit optimally utilizing a plurality of shaped PDC cutting elements selectively situated about the cutting surfaces of the pilot and the reamer to produce a minimal force imbalance, where further the pilot bit and the reamer are force balanced to further reduce imbalance in the operation of the tool.
摘要:
A drag bit having a plurality of blades or ribs on its end face has one or more pockets milled into the top surfaces of said blades. A tungsten carbide button or insert is positioned at the gauge diameter to reduce impact on the gauge diameter cutter in each of the fibs. The tungsten carbide button extends to the borehole gauge diameter to stabilize the bit within the borehole to limit bit whirling. The tungsten carbide button extends just forward of at least the final cutter assembly with respect to the direction of bit rotation to take the impact instead of the cutters. An additional tungsten carbide button or a shaped cutter is used along the blades in line with PDC cutting assemblies for limiting the penetration of the PDC cutting assemblies to thereby limit bit whirling or tilting instabilities. A shaped PDC cutter has a beveled edge with a bevel angle greater than the backrake angle of the PDC cutter so that engagement with the borehole wall is made with the tungsten carbide body rather than the PDC cutting portion to thereby function as a penetration limiter. As the bit wears, the PDC cutting portion begins to engage the formation in the same manner as the other PDC cutting assemblies.
摘要:
The present invention is directed to an improved cutting element for use with rotating downhole tools. More specifically, the present invention is directed to a compact cutter which includes unique configurations for the interface regions between the substrate the abrasive element to promote superior impact resistance and adhesion.
摘要:
A drilling tool operational with a rotational drive source for drilling in a subterranean formation where said tool comprises a body defining a face disposed about a longitudinal axis, a plurality of cutting elements fixedly disposed on and projecting from said tool face and spaced apart from one another, and one or more stabilizing elements disposed on the tool face and defining a beveled surface.
摘要:
The present invention is directed to an improved, stabilized drill bit including a shank disposed about a longitudinal axis for receiving a rotational drive source, a gauge portion and a face portion which includes a number of symmetrically arranged blades which themselves include radially situated cutting elements disposed at an exaggerated cutting angle.
摘要:
The invention relates to the design of earth bore-hole drill bits embodying shaped preformed cutters containing hard abrasive materials, such as diamonds, the cutters being mounted in companion preformed sockets in the hard metal bit matrix. The extent of penetration of the preformed cutters into the formation being drilled is controlled by providing surface set diamonds embedded in the matrix at or adjacent to its gage portion, the surface set diamonds projecting from the matrix to a much lesser extent than the preformed cutters. As a result, the surface set diamonds can penetrate into the formation only to the extent determined by engagement of the adjacent face of the matrix with the formation. Although the preformed cutters project from the matrix to a greater distance than the surface set diamonds, their extent of penetration into the formation is no greater than that of the surface set diamonds.
摘要:
An improved bi-center with improved directional stability and wear resistance is disclosed, said bit optimally utilizing a plurality of shaped PDC cutting elements selectively situated about the cutting surfaces of the pilot and the reamer to produce a minimal force imbalance, where further said pilot bit and the reamer are force balanced to further reduce imbalance in the operation of the tool.