公开(公告)号：US20170159366A1

公开(公告)日：2017-06-08

申请号：US14960250

申请日：2015-12-04

申请人： PDB Tools, Inc.

发明人： Nam Duy Nguyen

IPC分类号： E21B10/52 ,  E21B10/08

CPC分类号： E21B10/52 ,  E21B10/08

摘要： An earth boring bit has rotary cutters with embedded tungsten carbide inserts and milled steel teeth. The teeth and the grooves are first milled into the cutters, with the grooves extending between bases of the teeth, parallel to the crests of the teeth. Hard facing is applied to surfaces of the teeth and the grooves, and then the cutters are heat treated. Insert sockets are drilled into the teeth, centrally disposed in crests of the teeth. The tungsten carbide inserts are secured in the insert sockets, aligned for forming cutting profiles with respective ones of the milled teeth. The cutters are preferably frustoconically shaped and used for a rotary cone rock bit, and the tungsten carbide inserts configured as chisel-shaped inserts having crests which are aligned parallel to the crests of the milled steel teeth.

公开(公告)号：US09657528B2

公开(公告)日：2017-05-23

申请号：US14525588

申请日：2014-10-28

申请人： PDB Tools, Inc.

发明人： Nam Duy Nguyen

IPC分类号： E21B10/22 ,  E21B10/18 ,  E21B10/24

CPC分类号： E21B10/18 ,  E21B10/24

摘要： An earth boring bit with sealed cutter bearings has lubricant flow passages which extend from an interior cavity of the bit body to spaces located between bearing shafts and rotary cutters. A lubricant compensator has an elongate body defined by a tube which has a first end disposed in one of the flow passages and a second end which extends into the interior cavity. A piston is initially disposed in the second end, biased to apply pressure to lubricant located in the flow passages. The first end has a section for receiving the piston when lubricant is expelled from within the tube. Apertures extend through a sidewall of the tube, spaced apart from the section in the first end and in fluid communication with the flow passages. The apertures, the flow passages, and the spaces located between bearing shafts and rotary cutters are sized for passing drilling fluid.

公开(公告)号：US10337254B2

公开(公告)日：2019-07-02

申请号：US14960250

申请日：2015-12-04

申请人： PDB Tools, Inc.

发明人： Nam Duy Nguyen

IPC分类号： E21B10/52 ,  E21B10/16 ,  E21B10/08

摘要： An earth boring bit has rotary cutters with embedded tungsten carbide inserts and milled steel teeth. The teeth and the grooves are first milled into the cutters, with the grooves extending between bases of the teeth, parallel to the crests of the teeth. Hard facing is applied to surfaces of the teeth and the grooves, and then the cutters are heat treated. Insert sockets are drilled into the teeth, centrally disposed in crests of the teeth. The tungsten carbide inserts are secured in the insert sockets, aligned for forming cutting profiles with respective ones of the milled teeth. The cutters are preferably frustoconically shaped and used for a rotary cone rock bit, and the tungsten carbide inserts configured as chisel-shaped inserts having crests which are aligned parallel to the crests of the milled steel teeth.

公开(公告)号：US10689912B1

公开(公告)日：2020-06-23

申请号：US16712223

申请日：2019-12-12

申请人： PDB Tools, Inc.

发明人： Nam Duy Nguyen

IPC分类号： E21B10/22 ,  E21B10/25 ,  E21B10/24

摘要： A sealed bearing rock bit has a plurality of legs with journals formed to extend inward and downward at the end of the legs. Each of the legs has a last machined surface located adjacent to the bases of the journals and into which a seal groove is formed which circumscribes the respective journal. Cutters are rotatably mounted to respective ones of the journals, with back faces of the cutters located adjacent to respective ones of the last machined surfaces. The back faces of the cutters have annular-shaped protrusions which extend from said back faces and protrude into the seal grooves beyond the last machined surfaces of said journals extending an annular-shaped seal surface which is engaged by a seal disposed in the seal groove, leaving more of the interface space between the journal and the cutter for larger roller bearings.

公开(公告)号：US20160115739A1

公开(公告)日：2016-04-28

申请号：US14525588

申请日：2014-10-28

申请人： PDB Tools, Inc.

发明人： Nam Duy Nguyen

IPC分类号： E21B10/18 ,  E21B10/24 ,  E21B10/25

CPC分类号： E21B10/18 ,  E21B10/24

摘要： An earth boring bit with sealed cutter bearings has lubricant flow passages which extend from an interior cavity of the bit body to spaces located between bearing shafts and rotary cutters. A lubricant compensator has an elongate body defined by a tube which has a first end disposed in one of the flow passages and a second end which extends into the interior cavity. A piston is initially disposed in the second end, biased to apply pressure to lubricant located in the flow passages. The first end has a section for receiving the piston when lubricant is expelled from within the tube. Apertures extend through a sidewall of the tube, spaced apart from the section in the first end and in fluid communication with the flow passages. The apertures, the flow passages, and the spaces located between bearing shafts and rotary cutters are sized for passing drilling fluid.

摘要翻译： 具有密封的切割器轴承的钻孔具有润滑剂流动通道，其从钻头体的内部空间延伸到位于轴承轴和旋转切割器之间的空间。 润滑剂补偿器具有由管限定的细长主体，其具有设置在一个流动通道中的第一端和延伸到内部空腔中的第二端。 活塞最初设置在第二端，被偏压以对位于流动通道中的润滑剂施加压力。 第一端具有用于当润滑剂从管内排出时接收活塞的部分。 孔径延伸穿过管的侧壁，与第一端中的部分间隔开并与流动通道流体连通。 孔，流动通道和位于轴承轴和旋转切割器之间的空间的尺寸适于通过钻井液。