Varel International | Date: 2015-02-06
A bit body for a drill bit for horizontal directional drilling includes a pair of legs and a small wedge member disposed between the pair of legs. A roller cone is rotatably mounted to each bearing shaft extending from a respective leg. The roller cones support full coverage cutting structures. A center jet nozzle is configured to direct drilling fluid between the pair of roller cones. A stabilizer member maintains an upright drilling position of the drill bit within the borehole.
Varel International | Date: 2015-04-22
A roller cutter drill bit with mixed bearing types includes a bit body (12) with at least one journal facet (36) and a cavity facet (34). A cavity extends into the bit body from the cavity facet (34). The bit body is configured to rotate about a bit axis (14) during drilling. A journal extends outward from the at least one journal facet (36). A first rotatable cutter (16) that supports a first plurality of cutting structures (23) has a journal portion received by the cavity. A second rotatable cutter (18) that supports a second plurality of cutting structures (23) has a cavity portion that receives the journal.
Varel International | Date: 2016-02-08
A method for drilling out a plug includes directing a hybrid rotary cone drill bit having a plurality of rotary cones into a borehole lined with a casing. A body of the plug is drilled out using milled teeth formed in the hybrid rotary cone drill bit. A slip of the plug is drilled out using cutter inserts secured into the rotary cone where the slip contacts the casing. The drilled out plug is directed up the borehole using a drilling fluid.
Varel International | Date: 2015-04-10
A drill bit for drilling a hole in an earth formation includes a bit body and a blade extending from the bit body. The blade has a leading section, a top section, and a plurality of transition sections extending between the leading section and the top section. The drill bit further includes a plurality of cutters. Each cutter is positioned in a respective cutter pocket formed. Each cutter extends beyond the top section of the blade, and each transition section of the blade is between adjacent cutter pockets. The drill bit further includes a plurality of abrasion resistant inserts. Each abrasion resistant insert is positioned in a respective insert pocket formed in the blade. The plurality of abrasion resistant inserts are designed to cut into an earth formation. At least a portion of each abrasion resistant insert is disposed at a respective transition section of the blade.
Varel International | Date: 2015-08-26
A fixed cutter bit for milling a frac plug includes a body and a face. The face includes a base surface and a plurality of cutter support structures extending from the base surface. Each cutter support structure has a peripheral portion and an inner portion disposed radially internal of the peripheral portion. At least one first-type cutter is supported by each peripheral portion; at least one second-type cutter is supported by each inner portion. The first type cutter is adapted to mill a harder material than the second-type cutter, and the first-type is different from the second-type.
Varel International | Date: 2015-09-02
An apparatus and method for manufacturing a downhole tool. The cemented matrix material is formed from a metal powder, a shoulder powder, and a binder material, wherein the metal powder and/or the shoulder powder includes at least one of stainless steel powder, nickel powder, cobalt powder, iron powder, or powders of other suitable metals or alloys, or a combination of such mentioned powders.
Varel International | Date: 2015-01-06
A layer of matrix powder is deposited within a mold opening. A layer of super-abrasive particles is then deposited over the matrix powder layer. The super-abrasive particles have a non-random distribution, such as being positioned at locations set by a regular and repeating distribution pattern. A layer of matrix powder is then deposited over the super-abrasive particles. The particle and matrix powder layer deposition process steps are repeated to produce a cell having alternating layers of matrix powder and non-randomly distributed super-abrasive particles. The cell is then fused, for example using an infiltration, hot isostatic pressing or sintering process, to produce an impregnated structure. A working surface of the impregnated structure that is oriented non-parallel (and, in particular, perpendicular) to the super-abrasive particle layers is used as an abrading surface for a tool.
Varel International | Date: 2016-03-23
An apparatus that includes one or more flow channels and method for fabricating such flow channels. The apparatus includes a body, one or more blades from one end of the body, and a corresponding gauge section disposed adjacently and in alignment with a respective blade. Each gauge section includes a leading section, a trailing section, a face section extending from one end of the leading section to an end of the trailing section, and at least one flow channel extending from the leading edge section to at least one of the trailing edge section or the face section.
Varel International | Date: 2015-11-25
A method of characterizing a quality of a polycrystalline diamond compact (PDC) cutter (300) includes obtaining a PDC cutter (300) that includes a leached layer (354) and an unleached layer (356). The unleached layer (356) is positioned adjacent to the leached layer (354), and the leached layer (354) has at least a portion of a catalyst material (214) removed from therein. The method further includes measuring capacitance values of the PDC cutter (300) at multiple frequencies of an electrical signal provided to the PDC cutter (300) by a capacitance measuring device (410) to measure the capacitance values of the PDC cutter (300). The method also includes characterizing a quality of the PDC cutter (300) based on a lowest capacitance value from among the capacitance values. Each capacitance value of the capacitance values is measured at a respective frequency of the multiple frequencies of the electrical signal.
Varel International | Date: 2015-04-16
A method for applying a coating to a surface of an industrial tool includes applying a coating including a thermosetting polymer to a metallic surface of the industrial tool. The coating is cured to form a bond between the coating and the metallic surface. According to certain embodiments, the thermosetting polymer may be combined with an additive. The additive may be selected to improve the chemical resistance or wear resistance of the coating and thereby improve the chemical resistance or wear resistance of certain surfaces of the industrial tool.