| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 175406000 | Noncutting portion forwardly of cutting portion (e.g., reamer) | 17 |
| 20100263936 | Reamers and Methods for Directional Drilling - A reamer includes a mandrel defining a mandrel axis and arms extending radially from the mandrel. Each arm has a proximal end and a distal end. The reamer includes a cutting head disposed on the distal end of each arm and cutting teeth disposed on each cutting head. The arms are arcuately spaced about the central mandrel to allow the movement of debris axially along the central mandrel and at least one of the arms defines a square cross-sectional shape. | 10-21-2010 |
| 20110100722 | ROTARY ROLLER REAMER - A bore hole rotary reamer includes a body having cutters rotatably mounted by one or more respective spindles. A bearing region is formed on the spindle. At least one annular seal prevents ingress of contaminant to the bearing region. A circumferential void is formed adjacent the seal. At least one passageway extends in an axial direction of the spindle to the circumferential void and a piston movable in the passageway in response to supply of pressure to an outer side of the piston from the environment which surrounds the reamer. The piston transfers pressure to fluid in the cylindrical passage on an inner side of the piston to supply pressure to the circumferential void and thereby to the seal. The pressure is substantially determined by the pressure of the environment surrounding the reamer. | 05-05-2011 |
| 20110100723 | REAMING TOOL - A reaming tool in the form of reamer shoe is adapted for location in a wellbore and has a rotationally balanced nose. | 05-05-2011 |
| 20110180330 | DRILLING ASSEMBLY WITH UNDERREAMING BIT AND METHOD OF USE - Embodiments provide apparatuses and methods for drilling and underreaming, particularly to underreamer expansion bits. Underreamer drill assemblies and underreaming bits manufactured in accordance with various embodiments may help to resist over-excavating or undermining, which may result in a more stable bore hole. | 07-28-2011 |
| 20120073879 | DOWNHOLE REAMER ASYMMETRIC CUTTING STRUCTURES - A cutting structure for use with a reamer in enlarging a borehole in a subterranean formation includes a plurality of cutter blocks, radially extendable from a reamer body away from a central axis of the reamer body, each of the plurality of cutter blocks comprising at least one cutter blade thereon, wherein an angular spacing about the central axis of the reamer body between the at least one cutter blade on each of the plurality of cutter blocks is unequal. | 03-29-2012 |
| 20120103695 | DRILLING EQUIPMENT AND ATTACHMENT MEANS FOR THE SAME - This invention relates to a ground drilling or cutting tool comprising a cutting element removably attached thereto by attachment means, the tool further including retention means adapted to maintain attachment of the cutting element to the tool in the event that the attachment means fails. The retention means comprises a first surface on a side of the cutting element, a mounting recess in the cutting tool in which at least a portion of said cutting element locates, a second surface in a side of the mounting recess against which said first surface locates, channels in each of said first and second surfaces that align so as to cooperatively define a dowel hole when said first and second surfaces locate together, at least one dowel that locates in the dowel hole, and means for retaining the or each dowel within the dowel hole. | 05-03-2012 |
| 20130153306 | FIXED CUTTER DRILL BIT HEEL AND BACK-REAM CUTTER PROTECTIONS FOR ABRASIVE APPLICATIONS - A method of manufacturing a fixed cutter drill bit may include loading a first matrix material of controlled thickness to at least a portion of a mold cavity corresponding to a heel surface of at least one blade; loading a second matrix material into the remaining portions of the mold cavity; heating the mold contents to form a matrix body of the fixed cutter drill bit; and disposing at least one back reaming element in at least one back reaming cutter pocket. | 06-20-2013 |
| 20130180782 | Turbine Driven Reaming Bit with Blades and Cutting Structure Extending into Concave Nose - A reaming bit designed to operate with low torque fluctuation when driven with a turbine at speeds in the order of 300-600 RPM and above features a profile that is arcuate from the gauge dimension to the nose area or alternatively has a blunt straight taper section but with a ratio of profile length (PL) to bit size (BS) of under 0.75. The blades extend into a concave cone and the cutting structure continues along the blades towards the center. The blades have a step near the gauge section to increase the exposure of the blade cutting structure. An array of protrusions are disposed parallel to and behind the cutting structure to increase high speed stability and adjacent the blade step transition to protect outer casing on run in. | 07-18-2013 |
| 20130180783 | Turbine Driven Reaming Bit with Stability and Cutting Efficiency Features - A reaming bit designed to operate with low torque fluctuation when driven with a turbine at speeds in the order of 300-600 RPM and above features a profile that is arcuate from the gauge dimension to the nose area or alternatively has a blunt straight taper section but with a ratio of profile length (PL) to bit size (BS) of under 0.75. The blades extend into a concave cone and the cutting structure continues along the blades towards the center. The blades have a step near the gauge section to increase the exposure of the blade cutting structure. An array of protrusions are disposed parallel to and behind the cutting structure to increase high speed stability and adjacent the blade step transition to protect outer casing on run in. | 07-18-2013 |
| 20130199858 | Keyseat Wiper - Embodiments of keyseat wipers for use in drilling processes, as well as methods for making and using such keyseat wipers, are described herein. Embodiments of keyseat wipers can include changing cross-sections and a relief sections that permit cut materials to pass by the keyseat wipers, reducing the possibility of a drill string with keyseat wipers from binding in a curved hole when being retrieved. | 08-08-2013 |
| 20140345952 | METHOD AND APPARATUS FOR REAMING WELL BORE SURFACES NEARER THE CENTER OF DRIFT - The present invention provides a method and apparatus for increasing the drift diameter and improving the well path of the well bore, accomplished in one embodiment by cutting away material primarily forming surfaces nearer the center of the drift, thereby reducing applied power, applied torque and resulting drag compared to conventional reamers that cut into all surfaces of the well bore. | 11-27-2014 |
| 20140374170 | Underreamer Apparatus and Method - A wellbore underreamer has a tubular body, a central body cavity, and pivotally mounted blades in slots on the periphery of the tubular body. A translatable piston in the central body cavity is urged away from cam surfaces on the blades by a biasing spring. The piston has an orifice restricted fluid passage and translates in response to fluid pressure determined by the selected piston orifice and biasing spring. Fluid circulates through the piston fluid passage and fluid passages in the underreamer while piston movement is restrained by the spring. At a predetermined fluid pressure, the piston moves to engage the blade cam surfaces to pivotally extend the blades outward from the blade slots. The blades are held in the slots by a spring biased ball until they are extended by the piston. | 12-25-2014 |
| 20160002979 | DIGGING BIT - A digging bit includes a reaming portion whose diameter is larger than a rear end portion of a bit body, and which is formed in a front end portion of the bit body rotated around an axis, a digging tip which is arranged in a front end portion of the reaming portion, a debris groove which extends in a direction of an axis, and which is formed in an outer peripheral portion of the reaming portion, and a communication groove which communicates with the debris groove, and which is formed from the outer peripheral portion to a rear end portion of the reaming portion. | 01-07-2016 |
| 20160123085 | Reamer for Use in Drilling Operations - The invention relates to reamers used downhole oil well operations, particularly in reaming while drilling applications. | 05-05-2016 |
| 20160123088 | Reamer for Use in Drilling Operations - The invention relates to reamers used downhole oil well operations, particularly in reaming while drilling applications. | 05-05-2016 |
| 20160123089 | Reamer for Use in Drilling Operations - The invention relates to reamers used downhole oil well operations, particularly in reaming while drilling applications. | 05-05-2016 |
| 175407000 | Impact type | 1 |
| 20130213718 | DRILL BIT FOR PERCUSSIVE ROCK DRILLING - The invention relates to a drill bit ( | 08-22-2013 |
