NATIONAL OILWELL DHT, L.P.
|NATIONAL OILWELL DHT, L.P. Patent applications|
|Patent application number||Title||Published|
|20140174827||Drilling Systems and Fixed Cutter Bits with Adjustable Depth-of-Cut to Control Torque-on-Bit - A drill bit for drilling a borehole in an earthen formation includes a connection member having a pin end. In addition, the drill bit includes a bit body coupled to the connection member and configured to rotate relative to the connection member about a central axis of the bit. The bit body includes a bit face. Further, the drill bit includes a blade extending radially along the bit face. Still further, the drill bit includes a plurality of cutter elements mounted to a cutter-supporting surface of the blade. Moreover, the drill bit includes a depth-of-cut limiting structure slidably disposed in a bore extending axially from the cutter-supporting surface. The depth-of-cut limiting structure is configured to move axially relative to the bit body in response to rotation of the bit body relative to the connection member.||06-26-2014|
|20140144709||APPARATUS AND METHOD FOR RETAINING INSERTS OF A ROLLING CONE DRILL BIT - An insert for a rolling cone drill bit includes a base portion having a central axis. The base portion is configured to be seated in a mating socket in a cone cutter of the rolling cone drill bit. In addition, the insert includes a cutting portion extending from the base portion. The base portion has a radially outer surface including a non-cylindrical axial retention feature configured to prevent the insert from moving axially out of the mating socket or a non-cylindrical torque holding feature configured to prevent the insert from rotating relative to the cone cutter.||05-29-2014|
|20140138161||Hybrid Rolling Cone Drill Bits and Methods for Manufacturing Same - A rolling cone drill bit for drilling a borehole in earthen formations includes a bit body having a bit axis. In addition, the rolling cone drill bit includes a rolling cone cutter mounted on the bit body and having a cone axis of rotation. The cone cutter includes a cone body, a plurality of teeth arranged in a first inner row, and a plurality of inserts. Each insert is disposed within one tooth in the first inner row.||05-22-2014|
|20130180181||Preparation of Nanocrystalline Diamond Coated Diamond Particles and Applications Thereof - A method of making a polycrystalline diamond cutter element includes forming a blend, comprising a first particle size of polycrystalline diamond particles and a second particle size of polycrystalline diamond particles; forming a suspension of nanocrystalline diamond particles suspended in a solvent; and mixing the blend into the suspension to form a polycrystalline diamond mixture comprising nanocrystalline diamond coated polycrystalline diamond particles. The mixture is sintered with a substrate at high temperature and high pressure to form the polycrystalline diamond cutter element.||07-18-2013|
|20130161099||Downhole Cutting Tool - A tool for reaming a borehole includes a tubular body having a central axis, an uphole reamer section mounted to the body, and a downhole reamer section mounted to the body. Each reamer section includes a first blade extending radially from the body. Each blade has an uphole end, a downhole end opposite the uphole end, and a formation-facing surface. The formation facing surface of the first blade of the uphole reamer section is disposed at a radius R||06-27-2013|
|20130092450||DISPERSION OF HARDPHASE PARTICLES IN AN INFILTRANT - Composite materials for use with a drill bit for drilling a borehole in earthen formations. The composite material comprises a first pre-infiltrated hardphase constituent and a second pre-infiltrated hardphase constituent. The second pre-infiltrated hardphase constituent is a carbide which comprises at least 0.5 weight % of a binder and at least about 1% porosity. The composite material further comprises an infiltrant.||04-18-2013|
|20130008640||Flowbore Mounted Sensor Package - Apparatus including a sensor-containing body is disposable within a flowbore of a downhole tool. The apparatus also comprises an adjustable engagement mechanism that is coupled to the body. The engagement mechanism has a first position that allows the body to move longitudinally through the flowbore, and a second position that prevents movement of the body relative to the flowbore.||01-10-2013|
|20120312603||OPTIMIZATION OF DRILL BIT CUTTING STRUCTURE - Disclosed is method for designing a fixed cutter drill bit comprising: (a) defining initial primary placement parameters for primary cutter elements; (b) repeatedly: selecting back up placement parameters for back up cutter elements; applying to a simulated formation a bit design having the combination of the defined initial primary placement parameters and the selected back up placement parameters; using the combination in the simulation and generating a value representative of a first design criteria of interest (such as resultant force on a cutter element, total out-of-balance force on the bit, resistance to slip stick, and resistance to bit vibration); comparing the generated value to a first predetermined acceptable value.||12-13-2012|
|20120193149||DRILL BIT WITH ENHANCED HYDRAULICS AND EROSION-SHIELD CUTTING TEETH - Disclosed is a rolling cone drill bit with inner row cutting teeth having portions shielded with an erosion-resistant material that differs in material properties from the tooth's core portion that is more impact resistant. The tooth includes shielding on at least a portion of the upstream end and along portions of the flanking surfaces. It includes shield-free portions on the flanks between the root and the tooth crest. Most of the tooth's perimeter is made of the core material and is free of shielding. Gage row teeth may be angled and form a channel to direct drilling fluid from the gage region of the borehole to locations where the inner row teeth are generating most cuttings. Nozzles are provided with non-uniform orientations.||08-02-2012|
|20120097457||POLYCRYSTALLINE DIAMOND CUTTING ELEMENT - A polycrystalline-diamond cutting element for a drill bit of a downhole tool. The cutting element includes a substrate and a diamond table bonded to the substrate. The diamond table includes a diamond filler with at least one leached polycrystalline diamond segment packed therein along at least one working surface thereof. The cutting element may be formed by positioning the diamond table on the substrate and bonding the diamond table onto the substrate such that the polycrystalline diamond segment is positioned along at least one working surface of the diamond table. A spark plasma sintering or double press operation may be used to bond the diamond table onto the substrate.||04-26-2012|
|20120062235||DOWNHOLE SENSOR ASSEMBLY AND METHOD OF USING SAME - A sensor assembly for sensing downhole parameters is provided. The sensor assembly is positionable in a downhole tool deployable into a subterranean formation to form a wellbore. The sensor assembly includes a carrier positionable in the downhole tool, at least one set of three accelerometers, and at least one set of three magnetometers. The carrier includes at least one set of three receptacles. The three receptacles are positioned radially about a periphery of the carrier at equal distances thereabout. The set of three accelerometers are correspondingly positionable in the at least one set of three receptacles, and the set of three magnetometers are correspondingly positionable in the at least one set of three receptacles. The set of three magnetometers includes two physical magnetometers and one virtual magnetometer. The virtual magnetometer is produced from the two physical magnetometers.||03-15-2012|
|20120018223||POLYCRYSTALLINE DIAMOND CUTTING ELEMENT AND METHOD OF USING SAME - A polycrystalline diamond cutting (PDC) element of a drill bit of a downhole drilling tool is provided. The PDC element having a substrate, a diamond table and at least one pattern. The diamond table has an initial cutting edge along a periphery thereof. The pattern integrally formed within the diamond table. The pattern(s) defining at least one discontinuity about the diamond table that, in operation, selectively breaks away upon impact to create new cutting edges in the diamond table whereby a sharp cutting edge is continuously exposed to a material being cut.||01-26-2012|
Patent applications by NATIONAL OILWELL DHT, L.P.