Abstract: A reaming tool forms a hole in the ground with a sidewall and a floor, and a deepened channel around the perimeter of the floor adjacent to sidewall. Fluid is provided during excavation to form a slurry to hold the sidewall and prevent cave-in of material into the hole. After the hole reaches a desired depth, the reaming tool is removed, and a shoring wall is inserted into the hole through the slurry and seated in the perimeter edge channel. The shoring wall includes vertical tubes for connection to a dewatering machine. Then, the slurry can be vacuumed from the hole, while the dewatering machine keeps the empty hole as dry as possible. Extending the shoring wall into the channel beyond the floor of the hole helps seal flow of water from entering the hole.

Abstract: The present disclosure relates to roller cone drill bit journals with asymmetric ball races and extended friction races. The disclosure also relates to methods of forming such journals, and methods of finishing these journals to produce finished journals with symmetric ball races.

Abstract: A hybrid bit with roller cones having inserts is disclosed, includes a bit body, blades and roller cones. All the fixed cutting elements at the inner cone section, nose section and shoulder section of blades herein constitutes two sets of corresponding fixed cutting elements respectively, forming two profile envelopes of fixed cutting elements at least in the interval at the nose section and shoulder section, the two profile envelopes of fixed cutting elements are spaced at high and low intervals at the nose section and shoulder section, forming two stages of cutting by fixed cutting elements; and the cutting position of the cone insert mainly corresponds to the nose section and shoulder section of blades, the outermost cutting profile envelope of cone inserts formed by all or part of cutting elements on cones herein is higher than the outermost cutting profile envelope of fixed cutting elements, forming the third stage of cutting.

Abstract: An earth-boring tool includes a body, a plurality of blades attached to the body and extending at least to a nose region of the earth-boring tool, a first rotatable cutting structure assembly coupled to the body, and a second rotatable cutting structure assembly coupled to the body. The first rotatable cutting structure assembly includes a first leg and a first rotatable cutting structure rotatably coupled to the first leg. A first cutting profile of the first rotatable cutting structure extends at least from a gage region of the earth-boring tool and at least partially through a cone region of the earth-boring tool. The second rotatable cutting structure assembly includes a second leg and a second rotatable cutting structure rotatably coupled to the second leg. A second cutting profile of the second rotatable cutting structure extends only from the gage region of the earth-boring tool and to an innermost boundary of a nose region of the earth-boring tool.

Abstract: An earth-boring tool includes a body having a shank and a crown, a plurality of blades protruding from the crown of the body and extending at least substantially along a longitudinal length of the crown of the body, each blade extending radially outward and defining a respective radially outermost gage surface. The earth-boring tool further includes at least one rotatable cutting structure assembly including a leg and a rotatable cutting structure rotatably coupled to the leg. The earth-boring tool also includes at least one stabilizing structure secured to the crown of the body between an end of the leg opposite the rotatable cutting structure and the shank of the body, the at least one stabilizing structure being at least substantially circumferentially aligned with the leg of the at least one rotatable cutting structure assembly along a circumference of the crown of the body.

Abstract: A hybrid drill bit includes both fixed cutting elements and rotational cutting elements thereon. The fixed cutting elements are affixed to a bit body and define a peripherally-located fixed cutting structure disposed radially outward of the rotational cutting elements. The rotational cutting elements define a centrally-located counter-rotational cutting structure including two hemispherical counter-rotational cutting members mounted for counter-rotation with respect to one another on an axis generally perpendicular to a bit body rotational axis.

Abstract: The present disclosure relates to nested bearings and seals for use in roller cone drill bits. The bearing may include a bearing member, such as a flange or bushing, that is nested with a seal boss.

Abstract: A composite drill bit has one or more scraping-wheel cutting units disposed on fixed-blade. The drill bit comprises a bit body, fixed-blades, and scraping-wheels. The angular deflection of the scraping-wheel is in the range of 20°?|?|?90°. The scraping-wheel cutting unit has a scraping-wheel shaft and a scraping-wheel with cutters disposed thereon. The scraping-wheel cutting unit is disposed on the fixed-blade by a rotary connection.

Abstract: A downhole tool, for selectively reaming a wellbore or stabilizing drill string components within a wellbore, includes an elongate tool body adapted to receive reamer cartridges or stabilizer cartridges. The reamer cartridges are radially insertable into corresponding pockets in the tool body, each reamer cartridge having a reamer insert with an array of cutting elements. The reamer insert is disposed within a bushing and is rotatable relative thereto, about a rotational axis transverse to the longitudinal axis of the tool. The rotational axis is offset from the tool body axis, resulting in eccentric contact of the cutting elements with the wall of the wellbore, which in turn imparts rotation to the reamer insert when the tool is moved axially through a wellbore without rotation. When the tool is used for stabilization, the reamer cartridges can be replaced with stabilizer cartridges having stabilizer inserts with hard-faced stabilizer cones.

Abstract: A method of forming a casing bit includes positioning a cutting element adjacent an outer surface of a casing bit body. The cutting element has a superhard material and a bonding material that is used to bond the cutting element to a body of the casing bit. The bonding material may be a weldable or brazable metal alloy, and a welding process or a brazing process, respectively, may be used to bond the cutting elements to body of the casing bit. Casing bits fabricated using such methods may exhibit reduced bond strength between the cutting elements and the casing bit body.

Abstract: A roller bit for rock breaking by rotary cutting comprises: a bit body (1), a roller (2) and cutting teeth (3). An included angle ? between a roller journal plane of the bit body and the roller on a bit axis has a range of 0°<?<90°, a journal offset S has a range of ?D/2<S<D/2, wherein D represents a diameter of the bit. Inner row of teeth rings on the bit cuts a center of a borehole bottom, and each row of teeth ring is capable of scraping a borehole wall, and thus the bit has good effects of gauge protection and sidetracking.

Abstract: A polycrystalline compact comprises a plurality of grains of hard material and a plurality of nanoparticles disposed in interstitial spaces between the plurality of grains of hard material. The nanoparticles have cores of a first material and at least one oxide material on the cores. An earth-boring tool comprises such a polycrystalline compact. A method of forming a polycrystalline compact comprises combining a plurality of hard particles with a plurality of nanoparticles to form a mixture and sintering the mixture to form a polycrystalline hard material comprising a plurality of interbonded grains of hard material. A method of forming a cutting element comprises infiltrating interstitial spaces between interbonded grains of hard material in a polycrystalline material with a plurality of nanoparticles.

Abstract: A tricone rock bit for horizontal wells and hard formation wells includes three head sections and three cones arranged at the lower ends of the head sections, where the supper parts of the three head sections are connected together to form one integrated drill bit body; jet nozzle bosses are arranged between the head sections on the drill bit body; jet nozzles are mounted in nozzle holes of the jet nozzle bosses; gauge cutting elements are arranged on the top rear of the OD of the head sections, forming a gauge surface on the top of the head sections; the front face of the head sections is a ruled surface, inclining backwards at an angle ?, and inclining outwards at an angle ?. The tricone rock bit has low lateral vibrations, high stability, good effects of bottom hole cleaning and cutting element cooling, long service life and high penetration rate.

Abstract: A tool of a machine tool includes a tool body 8 in which there are formed: first suction holes 8d opened near cutting edges 9 and extending toward an axis P of a shaft portion 8a; and a second suction hole 8e to which the first suction holes 8d join and which extends in an axial direction of a spindle 7 and communicates with a chip discharge hole 7a of the spindle 7.

Abstract: A drill bit includes a bit body, a plurality of blades extending radially from the bit body, a plurality of cutter pockets disposed on the plurality of blades, at least one rolling cutter disposed in one of the cutter pockets, wherein each rolling cutter has a substrate, a cutting face, a cutting edge, and a side surface, and at least one blocker positioned adjacent to each of the at least one rolling cutters on a leading face of the blade, wherein each blocker has a retention end and an attachment end. The retention end of each blocker is positioned adjacent to a portion of the cutting face of each rolling cutter to retain the rolling cutter in the cutter pocket and the attachment end is attached to a portion of the blade.

Abstract: A composite drill bit with a bit body configured at its upper extend for connection into a drillstring, comprising: a bit body (1) with at least one bit leg (3), at least one scraping-wheel (2) set with a cutter-row (4), and a set of cutters fixed thereon. The scraping-wheel (2) is mounted for rotation on the corresponding bit leg (3) with a large angular deflection ? in the range of 20°?|?|?90°. The cutters on the scraping-wheel break rock by means of successive scraping, forming a cross-cutting area on the bottomhole accompanied by the cutters on the fixed cutting unit, thus achieving high rock-breaking efficiency, even wear, high cooling performance, and a longer service life for the cutters, bearings and the drill bit.

Abstract: A cutter profile for a fixed cutter drill bit having a drill bit axis, the cutter profile including a nose portion radially offset from the drill bit axis and surrounding the drill bit axis, a first cone-shaped depression centered on the drill bit axis and extending radially to the nose portion, and a second cone-shaped depression centered on the drill bit axis and extending radially toward the nose portion, wherein a second depression diameter is smaller than a first depression diameter, wherein a second depression maximum depth is greater than a first depression maximum depth, and wherein a second depression included angle is smaller than a first depression included angle.

Abstract: An earth boring drill bit designed for a specific performance, within a finished product tolerance, using components built to a looser manufacturing tolerance. The bit may be assembled by selecting a leg from a plurality of pre-manufactured legs; selecting a bit body from a plurality of pre-manufactured bit bodies, the bit body having a slot for receiving the leg; placing the leg within the slot; and fixing the leg within the slot within the finished product tolerance by placing one or more shims between the leg and the slot. The shims may be used to adjust an axial position, a radial position, and/or a circumferential position of the leg with respect to the slot. The leg and the bit body may be selected, or produced, to ensure the bit will not meet the specification, given the manufacturing tolerance, without the shims.

Abstract: A cutting tool may include a tool body having a plurality of blades extending radially therefrom; each of the plurality of blades having a plurality of cutter pockets formed therein; and at least one rotatable cutting element having a cutting table with a convex cutting surface mounted in at least one of the plurality of cutter pockets, wherein the at least one rotatable cutting element is mounted in a nose or shoulder region of the at least one of the plurality of blades.

Abstract: Drill bits with at least two roller cones of different diameters and/or utilizing different cutter pitches in order to reduce bit tracking during drilling operations are described. In particular, earth boring drill bits are provided, the bits having two or more roller cones, and optionally one or more cutter blades, the bits being arranged for reducing tracking by the roller cone teeth during operation by adjusting the teeth spacing, cone pitch angle, and/or the diameter of one or more of the cones. These configurations enable anti-tracking behavior and enhanced drilling efficiency during bit operation.

Abstract: A downhole cutting tool may include a cutting element support, structure having a plurality of cutter pockets formed therein; and a plurality of rotatable cutters disposed in the plurality of cutter pockets, wherein at least one rotatable cutter is spaced from another rotatable cutter on the cutting element support structure by at least one-quarter of the diameter of the at least one rotatable cutter.

Abstract: The present disclosure provides a back reamer roller cone that is configured so that the bearings assemblies therein can be relatively easily removed and replaced. Methods of replacing the bearing assemblies in a back reamer are also provided.

Abstract: Earth-boring tools may have a body, a cutting element attached to the body at a first location, and a formation-engaging structure attached to the body at a second location. The formation-engaging structure may be movable during a drilling operation between a first position and a second position. In the first position, the formation-engaging structure may be located rotationally behind the cutting element at a first radial distance from a longitudinal axis of the body at which the cutting element will at least initially shield the formation-engaging structure from engaging a formation. In the second position, the formation-engaging structure may be located at a different second radial distance from the longitudinal axis of the body at which the formation-engaging structure will engage a formation.

Abstract: A drill bit is disclosed, wherein the drill bit has a bit body with a longitudinal axis extending there through and a bit face. A plurality of blades extends from the bit body, wherein the plurality of blades has a blade profile including a nose.

Abstract: A bit body is configured at its upper extent for connection into a drillstring. At least one fixed blade extends downwardly from the bit body, and has a radially outermost gage surface. A plurality of fixed cutting elements is secured to the fixed blade, preferably in a row at its rotationally leading edge. At least one bit leg is secured to the bit body and a rolling cutter is mounted for rotation on the bit leg. At least one stabilizer pad is disposed between the bit leg and the fixed blade, the stabilizer pad extending radially outward to substantially the gage surface. The radially outermost gage surface of each blade can extend axially downward parallel to the bit axis or angled (non-parallel), spirally or helically, relative to the bit axis.

Abstract: A cutting tool cutting tool may include a tool body having a plurality of blades extending radially therefrom, a plurality of rotatable cutting elements having a first chamfer mounted on at least one of the plurality of blades, and a plurality of non-rotatable cutting elements having a second, distinct chamfer mounted on at least one the plurality of blades.

Abstract: A hybrid earth-boring bit comprising a bit body having a central axis, at least one, preferably three fixed blades, depending downwardly from the bit body, each fixed blade having a leading edge, and at least one rolling cutter, preferably three rolling cutters, mounted for rotation on the bit body. A rolling cutter is located between two fixed blades.

Abstract: A drill bit includes a bit body comprising at its upper end a connection adapted to connect to a drill string and at its lower end a plurality of journals extending downwardly and radially outward from a longitudinal axis of the bit. A plurality of roller cones are rotatably mounted on the plurality of journals and at least three rows of cutting elements are disposed on each of the plurality of roller cones. The outermost row of the at least three rows of cutting elements has an extension height to diameter ratio greater than a mid row, and the mid row has an extension height to diameter ratio greater than an innermost row.

Abstract: An earth boring drill bit is described, the bit having a bit body having a central longitudinal axis that defines an axial center of the bit body and configured at its upper extent for connection into a drillstring; at least one primary fixed blade extending downwardly from the bit body and inwardly toward, but not proximate to, the central axis of the drill bit; at least one secondary fixed blade extending radially outward from proximate the central axis of the drill bit; a plurality of fixed cutting elements secured to the primary and secondary fixed blades; at least one bit leg secured to the bit body; and a rolling cutter mounted for rotation on the bit leg; wherein the fixed cutting elements on at least one fixed blade extend from the center of the bit outward toward the gage of the bit but do not include a gage cutting region, and wherein at least one roller cone cutter portion extends from substantially the drill bit's gage region inwardly toward the center of the bit, the apex of the roller cone cutte

Abstract: A boring tool having downhole hammered impact elements that present to the bore face from platforms or plateaux of the work face of the tool, such work face having shear cutters able to benefit over the bore face from disruption caused by the impact elements.

Abstract: A drill bit that provides enhanced stability and a method for manufacturing such bit. In a preferred embodiment, the hybrid drill bit includes a single short driven blade in the shoulder region of the bit having each of its primary cutters plural set, sharing a common radial/elevational position with a primary cutter in an adjacent blade. All other primary cutters of the drill bit are single set at unique radial/elevational positions. The trailing plural-set cutters do less work than the other cutters and disrupt resonance and the feedback mechanism that leads to vibration, instability and whirling. In alternate embodiments, multiple blade pairs or groups may have primary cutters in the shoulder region that are plural set, sharing common radial/elevational positions with other primary cutters.

Abstract: A bit body is configured at its upper extent for connection into a drillstring. At least one fixed blade extends downwardly from the bit body, and has a radially outermost gage surface. A plurality of fixed cutting elements is secured to the fixed blade, preferably in a row at its rotationally leading edge. At least one bit leg is secured to the bit body and a rolling cutter is mounted for rotation on the bit leg. At least one stabilizer pad is disposed between the bit leg and the fixed blade, the stabilizer pad extending radially outward to substantially the gage surface. The radially outermost gage surface of each blade can extend axially downward parallel to the bit axis or angled (non-parallel), spirally or helically, relative to the bit axis.

Abstract: A drill bit configured for boring holes or wells into the earth, the drill bit having a face and a plurality of zones, the drill bit having geometrically sharp inserts located in an inner zone and non-geometrically sharp inserts located in an outer zone.

Abstract: A hole opener having a hybrid reaming section for downhole earth boring operations may include a reamer body having an axis of rotation, an outer periphery, and upper and lower ends, a plurality of rolling cutters coupled to the outer periphery, the rolling cutters defining a rolling cutter cutting profile having a cutting diameter, a plurality of fixed blade cutters coupled to the outer periphery and defining a fixed blade cutter cutting profile having a cutting diameter, each fixed blade cutter being coupled between adjacent rolling cutters. At least one fixed blade cutter may be asymmetrically coupled about the axis. The cutting diameter of the fixed blade cutter cutting profile and the cutting diameter of the rolling cutter cutting profile may collectively define a gage diameter. At least a portion of the fixed blade cutter cutting profile may be deeper than the rolling cutter cutting profile.

Abstract: A drill bit may include a bit body rotatable about a longitudinal axis and having, at one end, a connection for securing the drill bit to a drill string and having a face opposite the connection end; and a plurality of cutting structures having at least one fixed cutting structure disposed on the bit body face and at least one cutting body rotatably attached to the face of the bit body; wherein, in a rotated view of the plurality of cutting structures into a single plane, there is substantially no radial overlap between at least one fixed cutting structure and the at least one cutting body.

Abstract: An earth-boring bit comprising a bit body is configured at its upper end for connection into a drillstring. A fixed blade depends axially downwardly from the bit body. An axially extending slot is formed in the bit body adjacent the fixed blade. A bit leg is received and retained in the slot by engagement between the slot and correspondingly shaped bit leg, wherein the bit leg cannot be removed from the slot except by axial movement relative to the bit body. A rolling cutter is secured to the bit leg at its lower extent. A fastener secures the bit leg against movement relative to the bit body and extends through oblong apertures in the bit leg and into the bit body, the bit leg can be moved axially relative to the bit body to adjust the projection of the rolling cutter relative to the fixed blade.

Abstract: A hole opener having a hybrid reaming section for reaming subterranean wellbores may include a tubular reamer body having a longitudinal axis and upper and lower ends, a rolling cutter mount coupled to the body, a rolling cutter rotatably coupled to the mount, and a fixed blade coupled to the body adjacent the mount. A method of forming a hybrid reamer tool for downhole use may include providing a tubular stem having couplers on the upper and lower ends, coupling a reamer body having an outer periphery to the stem between the stem upper and lower ends, coupling a rolling cutter mount to the outer periphery of the reamer body, the mount having a rolling cutter rotatably coupled thereto, and coupling a fixed blade to the outer periphery of the reamer body adjacent the rolling cutter mount.

Abstract: An earth boring drill bit comprising a bit body having a bit profile including nose, shoulder, and gage sections; a plurality of fixed cutting elements secured to the body and defining a fixed cutter profile; and a roller cone rotatably secured to the body, the roller cone having a plurality of roller cone cutting elements defining a roller cutter profile, wherein the fixed cutter profile extends beyond the roller cutter profile in at least one of the sections and the roller cutter profile extends beyond the fixed cutter profile in at least one of the sections. The roller cutter profile may extend beyond the fixed cutter profile in the shoulder and gage sections, possibly with the fixed cutter profile extending beyond the roller cutter profile in the nose section and/or a cone section.

Abstract: Roller cone drill bits operable to form a borehole. A number of support arms may extend from each drill bit. A cutter cone assembly may be mounted on each support arm. A number of cutting elements or inserts may be disposed on an exterior surface of a cone assembly. A lifting surface may be formed on each support arm extending between a leading edge and a trailing edge of each support arm such that the lifting surfaces directs cuttings upward in a borehole. A wedge shaped portion may be formed on each support arm proximate the lifting surface and the trailing edge. An inlet to each lifting surface may be formed on the leading edge of each support arm.

Abstract: Methods for forming earth-boring tools include providing a metal or metal alloy bonding agent at an interface between a first element and a second element and sintering the first element, the second element, and the boding agent to form a bond between the first element and the second element at the interface. The methods may be used, for example, to bond together portions of a body of an earth-boring tool (which may facilitate, for example, the formation of cutting element pockets) or to bond cutting elements to a body of an earth-boring tool (e.g., a bit body of a fixed-cutter earth-boring drill bit or a cone of a roller cone earth-boring drill bit). At least partially formed earth-boring tools include a metal or metal alloy bonding agent at an interface between two or more elements, at least one of which may comprise a green or brown structure.

Abstract: A drill bit for cutting a borehole comprises a bit body. In addition, the drill bit comprises a rolling cone cutter mounted on the bit body and adapted for rotation about a cone axis. Further, the drill bit comprises at least one insert having a base portion secured in the rolling cone cutter and a cutting portion extending therefrom. The cutting portion includes a pair of flanking surfaces that taper towards one another to form an elongate chisel crest including a first crest end, a second crest end, and an apex positioned therebetween. A transverse radius of curvature at the first crest end is less than a transverse radius of curvature at the apex, and a transverse radius of curvature at the second crest end is less than the transverse radius of curvature at the apex.

Abstract: An earth boring drill bit designed for a specific performance, within a finished product tolerance, using components built to a looser manufacturing tolerance. The bit may be assembled by selecting a leg from a plurality of pre-manufactured legs; selecting a bit body from a plurality of pre-manufactured bit bodies, the bit body having a slot for receiving the leg; placing the leg within the slot; and fixing the leg within the slot within the finished product tolerance by placing one or more shims between the leg and the slot. The shims may be used to adjust an axial position, a radial position, and/or a circumferential position of the leg with respect to the slot. The leg and the bit body may be selected, or produced, to ensure the bit will not meet the specification, given the manufacturing tolerance, without the shims.

Abstract: An earth boring drill bit comprising a bit body having a bit profile including nose, shoulder, and gage sections; a plurality of fixed cutting elements secured to the body and defining a fixed cutter profile; and a roller cone rotatably secured to the body, the roller cone having a plurality of roller cone cutting elements defining a roller cutter profile, wherein the fixed cutter profile extends beyond the roller cutter profile in at least one of the sections and the roller cutter profile extends beyond the fixed cutter profile in at least one of the sections. The roller cutter profile may extend beyond the fixed cutter profile in the shoulder and gage sections, possibly with the fixed cutter profile extending beyond the roller cutter profile in the nose section and/or a cone section.

Abstract: A hybrid drill bit having at least two rolling cutters, each rotatable around an axis of rotation, at least one of the rolling cutters having a high pin angle, and at least one fixed blade. The pin angle can encompass pin angles above 39 degrees to less than 393 degrees. The drill bit can allow the rolling cutters to engage a shoulder portion and/or gage portion of the bit profile and assist the fixed blade(s) in these areas. The at least two rolling cutters can be disposed at different pin angles.

Abstract: A fixed cutter drill bit and a method for designing a fixed cutter drill bit includes simulating the fixed cutter drill bit drilling in an earth formation. A performance characteristic of the simulated fixed cutter drill bit is determined. A side rake angle distribution of the cutters is adjusted at least along a cone region of a blade of the fixed cutter drill bit to change the performance characteristic of the fixed cutter drill bit.

Abstract: In one aspect of the present invention, a high impact resistant tool comprises a sintered polycrystalline diamond body bonded to a cemented metal carbide substrate at an interface, the body comprising a substantially pointed geometry with an apex, the apex comprising a curved surface that joins a leading side and a trailing side of the body at a first and second transitions respectively, an apex width between the first and second transitions is less than a third of a width of the substrate, and the body also comprises a body thickness from the apex to the interface greater than a third of the width of the substrate.

Abstract: An improved cutter for fixed cutter drill bits includes a base portion with a longitudinal axis that extends through a center of the base portion and a cutting face which is generally centered with the base portion. The cutting face has a periphery edge geometry comprising a first arcuate segment and a second arcuate segment spaced apart and arranged opposite each other with linear edge segments disposed there between forming sides of the cutting face. The cutting face spans a maximum edge-to-edge dimension L in a first direction that corresponds to a major axis of the cutting face. The cutting face spans a maximum edge-to-edge dimension W in a second direction, which is perpendicular to the first direction, and W is less than L.

Abstract: Drill bits with at least two roller cones of different diameters and/or utilizing different cutter pitches in order to reduce bit tracking during drilling operations are described. In particular, earth boring drill bits are provided, the bits having two or more roller cones, and optionally one or more cutter blades, the bits being arranged for reducing tracking by the roller cone teeth during operation by adjusting the teeth spacing, cone pitch angle, and/or the diameter of one or more of the cones. These configurations enable anti-tracking behavior and enhanced drilling efficiency during bit operation.

Abstract: An article of manufacture includes a cemented carbide piece, and a joining phase that binds the cemented carbide piece into the article. The joining phase includes inorganic particles and a matrix material. The matrix material is a metal and a metallic alloy. The melting temperature of the inorganic particles is higher than the melting temperature of the matrix material. A method includes infiltrating the space between the inorganic particles and the cemented carbide piece with a molten metal or metal alloy followed by solidification of the metal or metal alloy to form an article of manufacture.

Abstract: An earth boring drill bit comprising a bit body having a bit profile including nose, shoulder, and gage sections; a plurality of fixed cutting elements secured to the body and defining a fixed cutter profile; and a roller cone rotatably secured to the body, the roller cone having a plurality of roller cone cutting elements defining a roller cutter profile, wherein the fixed cutter profile extends beyond the roller cutter profile in at least one of the sections and the roller cutter profile extends beyond the fixed cutter profile in at least one of the sections. The roller cutter profile may extend beyond the fixed cutter profile in the shoulder and gage sections, possibly with the fixed cutter profile extending beyond the roller cutter profile in the nose section and/or a cone section.