Abstract: The present disclosure provides a direct current (DC) transformer error detection apparatus for a pulsating harmonic signal, including a DC and pulsating harmonic current output module and an external detected input module, where the DC and pulsating harmonic current output module outputs a DC and a DC superimposed pulsating harmonic current to an internal sampling circuit and a self-calibrated standard resistor array; and the internal sampling circuit converts the input DC and the input DC superimposed pulsating harmonic current into a voltage signal, and sends the voltage signal to an analog-to-digital (AD) sampling and measurement component through a front-end conditioning circuit and a detected input channel. The DC transformer error detection apparatus can complete self-calibration for measurement of the DC and the pulsating harmonic signal on a test site.

Abstract: A milling tool includes a milling arm with a rotatable cutting element positioned on the milling arm. The rotatable cutting element may be fixed longitudinally and radially relative to a rotational axis of the rotatable cutting element in the milling arm while being rotatable about the rotational axis.

Abstract: A cutting insert for milling wellbore casing in a downhole environment includes a body having a cutting face and a chip-breaking face. The cutting face and chip-breaking face are oriented at a face angle relative to each other, the face angle being between 75° and 130°. As the wellbore casing is milled, swarf is formed and work hardened. Further deformation of the swarf and movement along, or in contact with, the chip-breaking face breaks the swarf into chips that are readily flushed away or transported within the wellbore.

Abstract: A milling tool includes a cutting insert coupled to a movable blade. The movable blade may change from a retracted to an expanded state to engage and cut downhole casing. A cutout initiation region of the movable blade makes contact with the downhole casing, and cutting inserts with turning portions designed to cut in a turning manner may be located in the cutout initiation region. Cutting inserts with milling portions designed to cut in a face-milling manner may be located outside the cutout initiation region. Some cutting inserts may include both turning portions and milling portions.

Abstract: A cutting element for a cutting tool. The cutting element may be at least partially made from a composite material including a carbide material, a binder material, and a plurality of diamond particles. The carbide material may be from 55 wt % to 97 wt % of a total weight of the composite material. The binder material may be from 3 wt % to 20 wt % of the total weight of the composite material. The plurality of diamond particles may be from 0.1% to 25% of the total weight of the composite material. The carbide material and the binder material may be combined and sintered together prior to being combined with the plurality of diamond particles, such that the carbide material and the binder material form a plurality of pellets having an average cross-sectional length from 10 ?m to 250 ?m.

Abstract: A cutting insert for milling wellbore casing in a downhole environment includes a body having a cutting face and a chip-breaking face. The cutting face and chip-breaking face are oriented at a face angle relative to each other, the face angle being between 75° and 130°. As the wellbore casing is milled, swarf is formed and work hardened. Further deformation of the swarf and movement along, or in contact with, the chip-breaking face breaks the swarf into chips that are readily flushed away or transported within the wellbore.

Abstract: A hardfacing composition comprising an iron-based binder alloy; and a carbide phase comprising a sintered carbide and a cast tungsten carbide, wherein the cast carbide is present in a quantity of at least 22% by weight, based on the total weight of the carbide phase, and the cast carbide comprises particles having sizes in the range of from 30 to 60 mesh. Also provided is a hardfacing composition comprising an iron-based binder alloy; and a carbide phase comprising a super dense sintered carbide and one or more additional carbide materials, wherein the super dense sintered carbide is present in a quantity of at least 10 percent by weight (% w), based on the total weight of the carbide phase, and comprises particles having sizes in the range of from 16 to 40 mesh. Included are methods of manufacturing such hardfacing compositions and downhole tools having such improved hardfacing compositions applied thereon.

Abstract: A milling tool includes a cutting insert coupled to a movable blade. The movable blade may change from a retracted to an expanded state to engage and cut downhole casing. A cutout initiation region of the movable blade makes contact with the downhole casing, and cutting inserts with turning portions designed to cut in a turning manner may be located in the cutout initiation region. Cutting inserts with milling portions designed to cut in a face-milling manner may be located outside the cutout initiation region. Some cutting inserts may include both turning portions and milling portions.

Abstract: A downhole tool includes a tool body and at least one blade coupled to the tool body. Cutting elements are coupled to a forward surface of the blade, and each cutting element may include a flank face and a trailing face to collectively define the width of the cutting element. A cutting edge is formed at the intersection of the flank face and a front face of the cutting element. The trailing and flank faces of adjacent cutting elements may be inclined relative to each other to define a flank angle that may be between greater than 0° and 15°. Adjacent cutting elements may have a gap therebetween, even when there is contact between the adjacent cutting elements.

Abstract: A downhole tool has a body with a bore formed at least partially therethrough. A cutter block may be coupled to the body and move radially outward from the body in response to an increased pressure in the bore. The cutter block may include an outer surface that transitions from a first portion to a second portion, with the first portion being downhole of the second portion. A radius of curvature between the first and second portions may be less than about 7 cm. The second portion or a line tangential thereto may be oriented at an angle from about 60° to about 120° with respect to a central longitudinal axis of the body. A plurality of cutting elements may be disposed on the outer surface of the cutter block. At least one of the cutting elements may be disposed at least partially on the first or second portion of the outer surface.

Abstract: A cutting element for a cutting tool. The cutting element may be at least partially made from a composite material including a carbide material, a binder material, and a plurality of diamond particles. The carbide material may be from 55 wt % to 97 wt % of a total weight of the composite material. The binder material may be from 3 wt % to 20 wt % of the total weight of the composite material. The plurality of diamond particles may be from 0.1% to 25% of the total weight of the composite material. The carbide material and the binder material may be combined and sintered together prior to being combined with the plurality of diamond particles, such that the carbide material and the binder material form a plurality of pellets having an average cross-sectional length from 10 ?m to 250 ?m.

Abstract: A conductor cleaning system for cleaning aluminum strands of all aluminum and steel reinforced conductors, such as ACSS, ACSR, ACAR, and AAA. The conductor cleaning system having a container adapted to receive a portion of a conductor to be cleaned, a housing adapted to receive and support the container, and a cleaning solution contained in the container for cleaning the portion of the conductor. The cleaning solution being adapted to clean the conductor without reacting with or damaging the conductor.

Abstract: A carbide composite material that includes a continuous ductile phase; and at least one discrete carbide region surrounded by the continuous ductile phase, each discrete carbide region may comprise an integrally bridged plurality of cast and/or sintered carbide particles, and each discrete region may have a nodular particle morphology.

Abstract: Cutting elements comprise a body and a polycrystalline diamond table disposed thereon, wherein the diamond table has a thickness of greater than about 2 mm. The body is specially formed from WC—Co and has a Co content of equal to or less than about 10 weight percent based on the total weight of the WC—Co, a coefficient of thermal expansion that is less than about 5×10?6/° C., a Palmqvist toughness greater than about 180 kg/mm, and a hardness equal to or greater than about 88 HRA. In an example, the WC has an average particle size of about 1 to 5 micrometers, the Co content is from about 7 to 9 weight percent, the coefficient of thermal expansion is from about 4 to 5×10?6/° C., the Palmqvist toughness is from about 200 to 300 kg/mm, and the hardness is in the range of from about 88 to 90 HRA.

Abstract: Downhole tools include a component, at least a portion of which includes ternary boride cermet. A method of making a downhole tool including a ternary boride cermet includes obtaining a ternary boride cermet material and heating the ternary boride cermet material and a binder to form the downhole tool.

Abstract: A conductor cleaning system for cleaning aluminum strands of all aluminum and steel reinforced conductors, such as ACSS, ACSR, ACAR, and AAA. The conductor cleaning system having a container adapted to receive a portion of a conductor to be cleaned, a housing adapted to receive and support the container, and a cleaning solution contained in the container for cleaning the portion of the conductor. The cleaning solution being adapted to clean the conductor without reacting with or damaging the conductor.

Abstract: A conductor cleaning system for cleaning aluminum strands of all aluminum and steel reinforced conductors, such as ACSS, ACSR, ACAR, and AAA. The conductor cleaning system having a container adapted to receive a portion of a conductor to be cleaned, a housing adapted to receive and support the container, and a cleaning solution contained in the container for cleaning the portion of the conductor. The cleaning solution being adapted to clean the conductor without reacting with or damaging the conductor.

Abstract: An insert for a drill bit and method of making an insert is disclosed herein. An insert has a grip region, a cutting extension having a cutting surface, and at least one implant embedded in the cutting extension, wherein the cutting extension comprises a first carbide material and the implant comprises a second carbide material, and wherein the second carbide material has a hardness that is greater than the first carbide material.

Abstract: A hardfacing composition comprising a carbide phase and a matrix phase, The carbide phase comprises mono-tungsten carbide in a quantity of greater than 50 percent by weight, based on the total weight of the carbide phase. The matrix phase comprises iron and nickel. The nickel is present in a quantity in the range of from 0.5 to 20 percent by weight, based on the total weight of the matrix phase. Also included are methods of applying such hardfacing compositions to a downhole tool and downhole tools having such hardfacing compositions applied thereon.

Abstract: A downhole tool having a layer of wear resistant material applied thereon utilizing a thermal spray process and methods of manufacturing such downhole tools.