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| Number | Title | Issue Date |
| 8172010 | Rotary drill bit steerable system and method A drill bit comprising: a cutting section comprising gage cutters, wherein in the cutting section is a first end of the bit, and wherein the cutting section has a full gage diameter; a heel section comprising a blade, wherein the heel section is at an end of the dri... | 05/08/2012 |
| 7958953 | Drilling tool A bi-center drilling tool comprises a main reamer region located eccentrically to an axis of rotation of the tool, and a leading cutting structure located ahead of the main reamer region, in the drilling direction. The leading cutting structure is located so as to a... | 06/14/2011 |
| 7882907 | Earth boring bit The earth boring bit 10 is designed to bore an angular non-vertical hole into underlying strata. The bit 10 includes a plurality of steeply inclined cutting faces or edges 22 that define a relatively narrow included angle A therebetween. The bit... | 02/08/2011 |
| 7384223 | Anchoring drill bit, system and method of anchoring A system, apparatuses and methods for anchoring are provided. The system includes two-stage drill bit and a method of anchoring into a two-stage hole drilled by the drill bit. The apparatus of the instant invention includes a two-stage drill bit for drilling a pilot... | 06/10/2008 |
| 7357200 | Earth auger An earth auger presents a shank having a spiral earth removing structure therearound. The structure first presents a series of spirally positioned housings with cutting teeth therein followed by a spiral cutting edge about the shank. The teeth are radially, vertical... | 04/15/2008 |
| 7293617 | Polycrystaline diamond compact insert reaming tool A reaming tool including a body adapted to couple to a drill string at both axial ends thereof, the body including a plurality of reaming blades affixed at azimuthally spaced apart locations around the circumference of the body, wherein selected ones of the pluralit... | 11/13/2007 |
| 7137463 | Polycrystaline diamond compact insert reaming tool A reaming tool that includes a body having reaming blades affixed thereto. The reaming blades each have at least one cutter attached thereto at a selected position and orientation. The plurality of reaming blades includes at least one radially most extensive reaming... | 11/21/2006 |
| 7048078 | Expandable underreamer/stabilizer A downhole tool that functions as an underreamer or as a stabilizer in an underreamed borehole. The tool includes one or more moveable arms disposed within a body having a flowbore therethrough in fluid communication with the wellbore annulus. The tool alternates be... | 05/23/2006 |
| 6994494 | Device for producing bored piles Device for producing bored piles having an auger, which along at least part of the auger length is surrounded by a rotating encasing tube and during boring the encasing tube is rotated in or counter to the rotation direction of the auger and in which the auger and t... | 02/07/2006 |
| 6929076 | Bore hole underreamer having extendible cutting arms A bore hole underreamer is provided having a hollow body with a longitudinal axis, which has an external wall, at least two cylindrical bores provided through the external wall and whose axes are transverse to the longitudinal axis. Each of the bores have a cylindri... | 08/16/2005 |
| 6929078 | Apparatus for use in enlarging a borehole A device for enlarging a bore includes an elongate body having a forward end, a rear end and an axis of rotation. The body of the device is adapted to be moved through the bore while being rotated about its axis. The device also includes a cutting blade which is att... | 08/16/2005 |
| 6926099 | Drill out bi-center bit and method for using same A drill out bi-center bit and a method for using the same are provided that offer the ability to drill out cement and casing shoes, and increased stability. The bi-center bit includes a bit body having a first end operable to be coupled with a drill string, a second... | 08/09/2005 |
| 6913098 | Sub-reamer for bi-center type tools 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... | 07/05/2005 |
| 6902014 | Roller cone bi-center bit A roller cone bi-center bit for economically drilling an enlarged borehole below casing in earth formation is provided. The bi-center bit includes a rolling cone cutter or other appropriate cutter to enlarge a pilot bore also made by rolling cone or other type of cu... | 06/07/2005 |
| 6860344 | Monolithic roof cutting bit insert A rotary drill bit for penetrating earth strata wherein the drill bit includes a drill bit body that has an axial forward end. The drill bit body has a hard insert, which is preferably monolithic, that is affixed to the drill bit body at the axial forward end thereo... | 03/01/2005 |
| 6840337 | Method and apparatus for removing cuttings An apparatus and method for removing cuttings in a deviated borehole using drilling fluids. The apparatus includes a pipe string and a bottom hole assembly having a down hole motor and bit for drilling the borehole. The pipe string has one end attached to the bottom... | 01/11/2005 |
| 6824331 | Screw form anchor device A screw form anchor device (10) intended for screwed penetration into a host material. The anchor device (10) includes a body (11) having a manipulating end (12) and a distal end (13). A screw thread (22) is formed by a plur... | 11/30/2004 |
| 6742607 | Fixed blade fixed cutter hole opener A hole opener including a tool body having upper and lower ends. The upper and lower ends may be coupled to adjacent drilling tools. At least two blades are formed on the tool body and are arranged so that the hole opener is positioned concentric with a wellbore, an... | 06/01/2004 |
| 6695080 | Reaming apparatus and method with enhanced structural protection A method and apparatus for reaming or enlarging a borehole with the ability to drill cement, cement float equipment, and debris out of a casing without substantial damage to the casing interior or the reaming apparatus. The reaming apparatus also provides... | 02/24/2004 |
| 6659207 | Bi-centered drill bit having enhanced casing drill-out capability and improved directional stability A bi-center drill bit is disclosed which includes a bit body having pilot blades and reaming blades distributed azimuthally around the body. The blades have cutting elements disposed thereon at selected positions. The body and blades define a longitudinal... | 12/09/2003 |
| 6655476 | Earth boring bit An earth boring bit for boring a hole having a predetermined depth into the earth. The earth boring bit includes a cylindrical drum for being mounted for rotation on the end of a boom of a mobile machine and connected to and rotated by a power supply moun... | 12/02/2003 |
| 6629476 | Bi-center bit adapted to drill casing shoe The invention is directed to a bi-center drilling tool adapted to fit within and drill through a casing shoe without damage to the surrounding casing. In one embodiment, the tool comprises a bit body having a proximal and a distal end where the distal end... | 10/07/2003 |
| 6609580 | Polycrystalline diamond compact insert reaming tool A reaming tool which includes a body having reaming blades affixed thereto at azimuthally spaced apart locations around a circumference of the body is shown and described. The reaming blades each have at least one cutter attached thereto at selected posit... | 08/26/2003 |
| 6533048 | Earth boring bit An earth boring bit for boring a hole having a predetermined depth into the earth. The earth boring bit includes a cylindrical drum for being mounted for rotation on the end of a boom of a mobile machine and connected to and rotated by a power supply moun... | 03/18/2003 |
| 6471445 | Rotary displacement piling equipment A rotary displacement piling equipment for boring a hole within the soil includes a rotary displacement bit, driving rod members connected to the bit, a casing surrounding the driving rod member, and a casing adapter having a lower end provided with a cyl... | 10/29/2002 |
| 6464024 | Bi-centered drill bit having improved drilling stability, mud hydraulics and resistance to cutter damage A bi-center drill bit includes pilot and reaming blades affixed to a body at azimuthally spaced locations. The blades have PDC cutters attached at selected positions. In one aspect, the pilot blades form a section having length along the bit axis less tha... | 10/15/2002 |
| 6412579 | Two stage drill bit A bi-center downhole drilling bit is disclosed, which bit includes a body defining proximal and distal ends, where said distal end defines a pilot and a reamer where the reamer defines a first cutting face having a selected diameter "d" and the pilot defi... | 07/02/2002 |
| 6397958 | Reaming apparatus and method with ability to drill out cement and float equipment in casing A method and apparatus for reaming or enlarging a borehole with the ability to drill cement, cement float equipment, and debris out of a casing without substantial damage to the casing interior or the reaming apparatus.... | 06/04/2002 |
| 6394200 | Drillout bi-center bit The present invention is a bi-center drill bit designed to drill out the cement and other material in the casing and then proceed to drill out the full gauge drilling diameter borehole with a diameter greater than the inside of the casing. The bi-center d... | 05/28/2002 |
| 6386302 | Polycrystaline diamond compact insert reaming tool A reamer for drilling a hole having a diameter larger than a pass through diameter in one aspect includes a body having reaming blades affixed at azimuthally spaced apart locations. These blades have cutters attached at selected positions. An outermost su... | 05/14/2002 |
| 6340064 | Bi-center bit adapted to drill casing shoe A bi-center bit adapted to be consecutively used in casing and in formation without the need of removing the bit from the borehole, the bit comprising a bit body defining a proximal end adapted for connection to a drill string, a distal end and a pass-thr... | 01/22/2002 |
| 6298929 | Bi-center bit assembly An improved bi-center drill bit and drill bit assembly includes a cylindrical body having a first diameter section and a smaller second diameter section, each section provided with a threaded end. The cylindrical body includes a longitudinal internal chan... | 10/09/2001 |
| 6283231 | Soil displacing screw auger and method for making a concrete pile with this auger Soil-displacing screw auger which contains an auger tube (1); a double displacement body (2) equipped with a hollow shaft (8) fixed to the auger tube (1) and containing an upper part (6) which constitutes a closed screw the radius of which increases towar... | 09/04/2001 |
| 6269893 | Bi-centered drill bit having improved drilling stability mud hydraulics and resistance to cutter damage A bi-center drill bit includes pilot and reaming blades affixed to a body at azimuthally spaced locations. The blades have PDC cutters attached at selected positions. In one aspect, the pilot blades form a section having length along the bit axis less tha... | 08/07/2001 |
| 6076618 | Rock drilling tool with radially extendable two-piece reamer A rock drilling tool includes a drill body on which a radially extendible reamer is mounted. The reamer, when extended, enlarges the hole diameter to enable a hole casing to be pulled down by the tool. The body includes a front pilot bit, a rear shank ada... | 06/20/2000 |
| 5992547 | Rotary drill bits A rotary drill bit for use in drilling holes in subsurface formations comprises a bit body having a leading face and a gauge region, a number of blades formed on the leading face of the bit and extending outwardly away from the axis of the bit so as to de... | 11/30/1999 |
| 5992548 | Bi-center bit with oppositely disposed cutting surfaces 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... | 11/30/1999 |
| 5931235 | Cutter head, boring jig and device and process for sea bottom boring A cutter head for retrieving earth samples, in particular for taking underwater samples, has, because of frustum-shaped cutting wheels, an approximately round bore cross section. In an associated boring jig, a tube with a cross section corresponding appro... | 08/03/1999 |
| 5875860 | Drill for making a pole in the ground and a method for applying such a drill Drill for making a pole in the ground, whereby this drill (9) is provided with a passage (15) and whereby this drill has at the bottom a screw-shaped displacement part (11) of which the outside increases in radius upwardly, up to a diameter larger than th... | 03/02/1999 |
| 5803195 | System, method and cutterhead for dry full-area drilling In a method for use in dry, rotary, crushing full-area drilling, use is made of suction air alone for removing cuttings produced during drillings. To carry out the method, two suction nozzles (13) are arranged on the underside of a cutterhead (1). These n... | 09/08/1998 |
