| NATIONAL OILWELL DHT, L.P. Patent applications |
| Patent application number | Title | Published |
|---|
| 20160108681 | 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. | 04-21-2016 |
| 20150299901 | Fixed Cutter Drill Bit Cutter Elements Including Hard Cutting Tables Made from CVD Synthetic Diamonds - Systems and methods of forming components from CVD single crystal diamonds that can withstand high temperatures and pressures, for example, in a mining and/or drilling environment. This may be accomplished by transforming a graphite powder by hot-filament chemical vapor deposition (HFCVD) into a CVD single diamond crystal powder, growing a plurality of CVD single diamond crystals on a planar surface of a substrate or on a dowel. In one example, if a substrate is used as the growth surface, the plurality of CVD single crystals grow in at least one layer on the substrate and at least a portion of the plurality of CVD single diamond crystals are removed from the substrate in the form of a plurality of discrete intact sheets of CVD single diamond crystals, stacked in a mold, and sintered, for example, to form a CVD single crystal diamond table. | 10-22-2015 |
| 20150233188 | Downhole Mills and Improved Cutting Structures - A drill bit for cutting through a downhole metal structure includes a bit body having a central axis and a bit face. The bit body is configured to rotate about the central axis in a cutting direction. In addition, the bit includes a cutting structure disposed on the bit face. The cutting structure includes a plurality of circumferentially spaced blades and a plurality of primary cutter elements mounted to each blade. Each primary cutter element has a forward-facing primary cutting face. Each primary cutter element is made of a whisker ceramic composite. | 08-20-2015 |
| 20150132604 | Multilayered Coating for Downhole Tools with Enhanced Wear Resistance and Acidic Corrosion Resistance - A coating for protecting a base material from wear and corrosion includes a first layer deposited directly onto an outer surface of the base material. In addition, the coating includes a second layer deposited directly onto the first layer. The first layer is positioned between the base material and the second layer. The first layer includes chromium having a first micro-crack density and the second layer comprises chromium having a second micro-crack density that is less than the first micro-crack density. | 05-14-2015 |
| 20150047905 | DRILLING SYSTEMS AND MULTI-FACED DRILL BIT ASSEMBLIES - A drill bit assembly that includes a shank including a shank axis, first and second ends, a drill bit seat at the second end and a central flow bore extending axially from the first end. Additionally, the assembly includes a sleeve disposed about and translatable axially relative to the shank and a drill bit rotatably coupled to the sleeve. The drill bit includes a first bit face having a first cutting structure configured to engage an earthen formation, and a second bit face having a second cutting structure configured to engage the earthen formation. The drill bit is configured to rotate about the about the shank axis in a cutting direction, and to rotate about an axis of rotation being orthogonal to the shank axis to selectively expose the first or second cutting surface to the earthen formation. The seat is configured to receive the first or second bit face. | 02-19-2015 |
| 20150034387 | DOWNHOLE SHOCK ASSEMBLY AND METHOD OF USING SAME - A shock assembly for use with a motion tool deployable into a wellbore by a conveyance. The motion tool includes a mandrel operatively connectable to the conveyance or the motion tool, a housing operatively connectable to the motion tool or the conveyance (the housing having an opening to slidingly receive the mandrel and including a first and a second spring portion), a first spring slidably positionable in the first spring portion and having a first spring stiffness, and a second spring slidably positionable in the second spring portion having a second spring stiffness. The second spring stiffness being less than the first spring stiffness such that the first and second springs selectively engage as the housing slidingly moves about the mandrel in response to forces applied to the system to selectively restrict movement between the mandrel and the housing whereby the motion tool is vibrated. | 02-05-2015 |
| 20140216761 | DOWNHOLE ACTIVATION ASSEMBLY AND METHOD OF USING SAME - A downhole activation assembly for activating a downhole component of a downhole tool positionable in a wellbore penetrating a subterranean formation. The activation assembly includes a housing operatively connectable to the downhole tool, a spring-loaded sleeve, and a ball catcher. The sleeve slidably positionable in the housing, and having a flow channel therethrough and an outer surface defining a chamber between the sleeve and the housing. The sleeve having inlets therethrough about a sleeve end thereof to permit fluid from the flow channel to pass therethrough. The ball catcher slidably positionable in the housing, and having a catcher end engageable with the sleeve end to selectively divert the fluid thereabout and a ball seat therein to receivingly engage a ball passing through the sleeve whereby the ball catcher selectively moves the downhole component between activation positions. | 08-07-2014 |
| 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 |
