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No. Publication Number Title Publication/Patent Number Publication/Patent Number Publication Date Publication Date
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1 US10570667B2
Polycrystalline diamond cutting element
Publication/Patent Number: US10570667B2 Publication Date: 2020-02-25 Application Number: 14/553,849 Filing Date: 2014-11-25 Inventor: Setlur, Deepthi Raj   Hughes, Michael D.   Francis, Mark Jonathan   Sreshta, Harold A.   Zhan, Guodong   Gilleylen, Russell C.   Sue, Jiinjen Albert   Assignee: NATIONAL OILWELL DHT, L.P.   IPC: E21B10/567 Abstract: 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. 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 ...More ...Less
2 US2020149353A1
Polycrystalline Diamond Cutting Element
Publication/Patent Number: US2020149353A1 Publication Date: 2020-05-14 Application Number: 16/741,444 Filing Date: 2020-01-13 Inventor: Setlur, Deepthi Raj   Hughes, Michael D.   Francis, Mark Jonathan   Sreshta, Harold A.   Zhan, Guodong   Gilleylen, Russell C.   Sue, Jiinjen Albert   Assignee: National Oilwell DHT, L.P.   IPC: E21B10/567 Abstract: 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. 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 ...More ...Less
3 CA2852007C
DISPERSION OF HARDPHASE PARTICLES IN AN INFILTRANT
Publication/Patent Number: CA2852007C Publication Date: 2018-01-16 Application Number: 2852007 Filing Date: 2012-10-10 Inventor: Sreshta, Harold A   Assignee: NATIONAL OILWELL DHT, L.P.   IPC: B22F3/00 Abstract: 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 preinfiltrated 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. 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 preinfiltrated hardphase constituent. The second pre-infiltrated hardphase constituent is a ...More ...Less
4 EP3080380B1
MATRIX FIXED CUTTER DRILL BITS AND METHODS FOR MANUFACTURING SAME
Publication/Patent Number: EP3080380B1 Publication Date: 2018-05-16 Application Number: 14838890.3 Filing Date: 2014-12-23 Inventor: Garner, Michael   Marshall, Jan Edgar   Sreshta, Harold A.   Assignee: National Oilwell DHT, L.P.   IPC: E21B10/43
5 BR112014008910A2
material compósito
Title (English): 1
Publication/Patent Number: BR112014008910A2 Publication Date: 2017-05-09 Application Number: 112014008910 Filing Date: 2012-10-10 Inventor: Harold, A Sreshta   Assignee: NATIONAL OILWELL DHT, L.P.   IPC: B22F3/00
6 US9631435B2
Matrix fixed cutter drill bits and methods for manufacturing same
Publication/Patent Number: US9631435B2 Publication Date: 2017-04-25 Application Number: 14/101,795 Filing Date: 2013-12-10 Inventor: Garner, Michael   Marshall, Jan Edgar   Sreshta, Harold A.   Assignee: NATIONAL OILWELL DHT, L.P.   IPC: E21B10/43 Abstract: A fixed cutter drill bit for drilling a borehole in earthen formations includes a blank assembly and a matrix crown fixably mounted to the blank assembly. The blank assembly includes an annular mandrel and a plurality of elongate studs fixably coupled to the mandrel. The mandrel has a first end distal the crown and a second end engaging the crown. In addition, the mandrel includes a plurality of bores extending axially from the second end. Each elongate stud has a first end disposed within one of the bores and a second end disposed in the crown distal the mandrel. A fixed cutter drill bit for drilling a borehole in earthen formations includes a blank assembly and a matrix crown fixably mounted to the blank assembly. The blank assembly includes an annular mandrel and a plurality of elongate studs fixably coupled to the mandrel. The mandrel ...More ...Less
7 US9604345B2
Hard-facing for downhole tools and matrix bit bodies with enhanced wear resistance and fracture toughness
Publication/Patent Number: US9604345B2 Publication Date: 2017-03-28 Application Number: 14/070,003 Filing Date: 2013-11-01 Inventor: Wang, Ying   Arceneaux, Sr. Wesley Craig   Sue, Jiinjen Albert   Sreshta, Harold A.   Assignee: NATIONAL OILWELL DHT, L.P.   IPC: B24D3/34 Abstract: A composite material and a methods of making and using the composite material, wherein the composite material provides improved wear resistance and fracture toughness to hard-facing and matrix materials for down hole drilling tools.
8 US9364936B2
Dispersion of hardphase particles in an infiltrant
Publication/Patent Number: US9364936B2 Publication Date: 2016-06-14 Application Number: 13/271,415 Filing Date: 2011-10-12 Inventor: Sreshta, Harold A.   Assignee: NATIONAL OILWELL DHT, L.P.   IPC: B22F3/10 Abstract: 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. 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 ...More ...Less
9 EP3080380A2
MATRIX FIXED CUTTER DRILL BITS AND METHODS FOR MANUFACTURING SAME
Publication/Patent Number: EP3080380A2 Publication Date: 2016-10-19 Application Number: 14838890.3 Filing Date: 2014-12-23 Inventor: Garner, Michael   Marshall, Jan Edgar   Sreshta, Harold A.   Assignee: National Oilwell DHT, L.P.   IPC: E21B10/42
10 CA2821074C
ENHANCED ELASTOMERIC STATOR INSERT VIA REINFORCING AGENT DISTRIBUTION AND ORIENTATION
Publication/Patent Number: CA2821074C Publication Date: 2016-06-21 Application Number: 2821074 Filing Date: 2011-08-23 Inventor: Sue, Jiinjen A   Sreshta, Harold A   Butuc, Stefan   Sicilian, Joshua A   Assignee: NATIONAL OILWELL VARCO, L.P.   IPC: B23P15/00 Abstract: A progressive cavity type motor or pump including a stator insert with a reinforcing agent dispersed in a manner to improve properties of the stator insert. The reinforcing agent may be a fiber
11 US9309767B2
Reinforced stators and fabrication methods
Publication/Patent Number: US9309767B2 Publication Date: 2016-04-12 Application Number: 13/817,032 Filing Date: 2011-08-15 Inventor: Sreshta, Harold A.   Sue, Jiinjen Albert   Butuc, Stefan M.   Marshall, Jan Edgar   Assignee: NATIONAL OILWELL VARCO, L.P.   IPC: F01C21/00 Abstract: A stator for a progressive cavity pump or motor comprises a tubular housing having a central axis. In addition, the stator comprises a stator insert coaxially disposed within the housing. The stator insert has a radially outer surface that engages the housing and a radially inner surface defining a helical-shaped through bore extending axially through the stator insert. The stator insert includes an insert body and an insert liner attached to the insert body. The insert body is radially positioned between the housing and the insert liner. The insert body comprises a reinforcement structure and a plurality of voids dispersed within the reinforcement structure. A stator for a progressive cavity pump or motor comprises a tubular housing having a central axis. In addition, the stator comprises a stator insert coaxially disposed within the housing. The stator insert has a radially outer surface that engages the housing and a radially ...More ...Less
12 EP3063106A1
HARD-FACING FOR DOWNHOLE TOOLS AND MATRIX BIT BODIES WITH ENHANCED WEAR RESISTANCE AND FRACTURE TOUGHNESS
Publication/Patent Number: EP3063106A1 Publication Date: 2016-09-07 Application Number: 14796354.0 Filing Date: 2014-10-24 Inventor: Wang, Ying   Arceneaux, Wesley Craig   Sue, Jiinjen Albert   Sreshta, Harold A.   Assignee: National Oilwell DHT, L.P.   IPC: C04B35/56
13 CA2814903C
POLYCRYSTALLINE DIAMOND CUTTING ELEMENT
Publication/Patent Number: CA2814903C Publication Date: 2016-01-19 Application Number: 2814903 Filing Date: 2011-10-25 Inventor: Sue, Jiinjen Albert   Setlur, Deepthi Raj   Sreshta, Harold A   Gilleylen, Russell C   Zhan, Guodong   Hughes, Michael D   Francis, Mark Jonathan   Assignee: NATIONAL OILWELL DHT, L.P.   IPC: E21B10/46 Abstract: A polycrystalline-diamond cutting clement (50) is disclosed for a drill bit of a downhole tool. The cutting element (50) includes a substrate (24) and a diamond table bonded to the substrate (24). The diamond table includes a diamond filler with at least one leached polycrystalline diamond segment (54) packed therein along at least one working surface thereof. The cutting element (50) may be formed by positioning the diamond table on the substrate (24) and bonding the diamond table onto the substrate (24) such that the polycrystalline diamond segment (54) 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 (24). A polycrystalline-diamond cutting clement (50) is disclosed for a drill bit of a downhole tool. The cutting element (50) includes a substrate (24) and a diamond table bonded to the substrate (24). The diamond table includes a diamond filler with at least one leached ...More ...Less
14 US2015159440A1
MATRIX FIXED CUTTER DRILL BITS AND METHODS FOR MANUFACTURING SAME
Publication/Patent Number: US2015159440A1 Publication Date: 2015-06-11 Application Number: 14/101,795 Filing Date: 2013-12-10 Inventor: Garner, Michael   Marshall, Jan Edgar   Sreshta, Harold A.   Assignee: National Oilwell DHT, L.P.   IPC: E21B10/43 Abstract: A fixed cutter drill bit for drilling a borehole in earthen formations includes a blank assembly and a matrix crown fixably mounted to the blank assembly. The blank assembly includes an annular mandrel and a plurality of elongate studs fixably coupled to the mandrel. The mandrel has a first end distal the crown and a second end engaging the crown. In addition, the mandrel includes a plurality of bores extending axially from the second end. Each elongate stud has a first end disposed within one of the bores and a second end disposed in the crown distal the mandrel. A fixed cutter drill bit for drilling a borehole in earthen formations includes a blank assembly and a matrix crown fixably mounted to the blank assembly. The blank assembly includes an annular mandrel and a plurality of elongate studs fixably coupled to the mandrel. The mandrel ...More ...Less
15 WO2015089515A2
MATRIX FIXED CUTTER DRILL BITS AND METHODS FOR MANUFACTURING SAME
Publication/Patent Number: WO2015089515A2 Publication Date: 2015-06-18 Application Number: 2014072182 Filing Date: 2014-12-23 Inventor: Sreshta, Harold A   Garner, Michael   Marshall, Jan Edgar   Assignee: NATIONAL OILWELL DHT, L.P.   IPC: E21B10/42 Abstract: A fixed cutter drill bit for drilling a borehole in earthen formations includes a blank assembly and a matrix crown fixably mounted to the blank assembly. The blank assembly includes an annular mandrel and a plurality of elongate studs fixably coupled to the mandrel. The mandrel has a first end distal the crown and a second end engaging the crown. In addition A fixed cutter drill bit for drilling a borehole in earthen formations includes a blank assembly and a matrix crown fixably mounted to the blank assembly. The blank assembly includes an annular mandrel and a plurality of elongate studs fixably coupled to the mandrel. The mandrel ...More ...Less
16 WO2015089515A3
MATRIX FIXED CUTTER DRILL BITS AND METHODS FOR MANUFACTURING SAME
Publication/Patent Number: WO2015089515A3 Publication Date: 2015-08-06 Application Number: 2014072182 Filing Date: 2014-12-23 Inventor: Sreshta, Harold A   Garner, Michael   Marshall, Jan Edgar   Assignee: NATIONAL OILWELL DHT, L.P.   IPC: E21B10/42 Abstract: A fixed cutter drill bit for drilling a borehole in earthen formations includes a blank assembly and a matrix crown fixably mounted to the blank assembly. The blank assembly includes an annular mandrel and a plurality of elongate studs fixably coupled to the mandrel. The mandrel has a first end distal the crown and a second end engaging the crown. In addition A fixed cutter drill bit for drilling a borehole in earthen formations includes a blank assembly and a matrix crown fixably mounted to the blank assembly. The blank assembly includes an annular mandrel and a plurality of elongate studs fixably coupled to the mandrel. The mandrel ...More ...Less
17 CA2932167A1
MATRIX FIXED CUTTER DRILL BITS AND METHODS FOR MANUFACTURING SAME
Publication/Patent Number: CA2932167A1 Publication Date: 2015-06-18 Application Number: 2932167 Filing Date: 2014-12-23 Inventor: Sreshta, Harold A   Garner, Michael   Marshall, Jan Edgar   Assignee: NATIONAL OILWELL DHT, L.P.   IPC: E21B10/42 Abstract: A fixed cutter drill bit for drilling a borehole in earthen formations includes a blank assembly and a matrix crown fixably mounted to the blank assembly. The blank assembly includes an annular mandrel and a plurality of elongate studs fixably coupled to the mandrel. The mandrel has a first end distal the crown and a second end engaging the crown. In addition A fixed cutter drill bit for drilling a borehole in earthen formations includes a blank assembly and a matrix crown fixably mounted to the blank assembly. The blank assembly includes an annular mandrel and a plurality of elongate studs fixably coupled to the mandrel. The mandrel ...More ...Less
18 WO2014052372A4
DOWNHOLE MILLS AND IMPROVED CUTTING STRUCTURES
Publication/Patent Number: WO2014052372A4 Publication Date: 2015-01-22 Application Number: 2013061556 Filing Date: 2013-09-25 Inventor: Sue, Jiinjen Albert   Sreshta, Harold A   Wright, Charles Leonard Ii   Assignee: SUE, JIINJEN, ALBERT   NATIONAL OILWELL DHT, L.P.   SRESHTA, HAROLD, A.   WRIGHT, CHARLES, LEONARD, II   IPC: C04B35/80 Abstract: A drill bit (10) for cutting through a downhole metal structure includes a bit body (12) having a central axis (11) and a bit face (20). The bit body is configured to rotate about the central axis in a cutting direction. In addition
19 US2015233188A1
Downhole Mills and Improved Cutting Structures
Publication/Patent Number: US2015233188A1 Publication Date: 2015-08-20 Application Number: 14/427,978 Filing Date: 2013-09-25 Inventor: Wright, Ii Charles Leonard   Sreshta, Harold A.   Sue, Jiinjen Albert   Assignee: National Oilwell DHT, L.P.   IPC: E21B10/573 Abstract: 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. 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 ...More ...Less
20 US8944789B2
Enhanced elastomeric stator insert via reinforcing agent distribution and orientation
Publication/Patent Number: US8944789B2 Publication Date: 2015-02-03 Application Number: 13/214,866 Filing Date: 2011-08-22 Inventor: Butuc, Stefan   Sue, Jiinjen A.   Sreshta, Harold A.   Sicilian, Joshua A.   Assignee: National Oilwell Varco, L.P.   IPC: F01C1/10 Abstract: A progressive cavity type motor or pump including a stator insert with a reinforcing agent dispersed in a manner to improve properties of the stator insert. The reinforcing agent may be a fiber, nanotube, metal, ceramic, or polymer. A dispersing agent may be used to obtain a homogenous distribution. A magnetic reinforcing agent may be incorporated into a stator insert. The stator insert is subjected to a magnetic field to orient the magnetic reinforcing agent in a particular orientation. The magnetic field may also reposition the magnetic reinforcing agent within the stator insert. The stator insert may be formed by injection molding, transfer, or compression molding among other methods. A progressive cavity type motor or pump including a stator insert with a reinforcing agent dispersed in a manner to improve properties of the stator insert. The reinforcing agent may be a fiber, nanotube, metal, ceramic, or polymer. A dispersing agent may be used to obtain a ...More ...Less