Abstract: An apparatus for reducing vibration includes a damping assembly configured to be fixedly attached to a downhole component. The downhole component is configured to rotate within a borehole in an earth formation, and the damping assembly has a damping frequency that is tuned relative to a selected natural vibration frequency of the rotating downhole component to reduce vibration due to component rotation.

Abstract: An electron emission device and a method of manufacturing the same are provided. The electron emission device includes i) a hydrophilic resin substrate and ii) carbon nano tubes that are positioned on the resin substrate. Surface roughness Ra of the resin substrate is 7.3 ?m to 9.75 ?m.

Abstract: A rock drilling device comprising a feed beam (4), which has a drill end (41) from which the drill point protrudes at drilling and a rear end(42) opposite the drill end; a rock drilling machine (5) movable along the feed beam (4); a pressure cylinder (6), which is arranged in connection with the feed beam (4) with one end (622) movable relative to the feed beam (4) and one end (611) fixedly arranged relative to the feed beam (4). The pressure cylinder (6) drives a feed line (51) for feeding the drilling machine (5) to and fro along the feed beam (4). The feed line (51) is routed over two outer sheaves (52, 53) that are arranged at each end (41, 42) of the feed beam (4) and a measuring device (7) for measuring the location of the drilling machine (5) relative to the feed beam (4) is arranged to the shaft (9) of one of the sheaves (52, 53) and the sheave and the shaft (9) are arranged such that they rotate together.

Abstract: According to one example of the invention, a drill rod handler includes a movable clamp. A position sensor system for the drill rod handler includes a level sensor that is configured to detect a position of the moveable clamp with respect to gravity. The position sensor system further includes a rotation sensor configured to detect a rotational position of the moveable clamp with respect to a defined axis that runs parallel to gravity. Furthermore, the position sensor system includes a control center that is communicably connected to the level sensor and the rotation sensor.

Abstract: A bore hole inclinometer device for use in core drilling employing hollow drill rods, and a core barrel, the device having, an elongated casing dimensioned to fit within the hollow drill rods, and having at its lower end an attachment for a core barrel, and at its upper end, an attachment for the wire by which it is hoisted and lowered through the hollow drill rods, an inclinometer within the casing operable to respond to the inclination of the casing to provide an inclination reading, a sensor for sensing the inclination of the casing and providing an inclination signal proportional to the inclination of the casing, an electrical circuit for powering the inclinometer, for receiving the inclination signal, and, an electrical power supply for powering the electrical circuit.

Abstract: The inclinometer comprises a single module for measuring the inclination and azimuth of a bore, such as that of an oil well. The single module contains a removable cassette with an inclination measurement means disposed on one side thereof and an azimuth measurement means on the opposite side so as to provide a measurement recording on the substrate of the recording means. An optical assembly is provided within said module for the inclination and azimuth measurement means. Further, a power source is disposed within said module. The module has an inner and outer housing means being provided within said inner housing for providing a rotational movement thereto.In accordance with another embodiment, the inclinometer comprises a first module being a power module for supplying power to the components of the second module.

Abstract: An inclinometer for determining the inclination of a well bore including a longitudinally extending housing adapted to be lowered into the well bore to a given depth, a marking element mounted in the upper part of the housing and being suspended from a point along the central axis of the housing, the marking element having a marking tip at the lower end located on a true vertical line from the suspension point, a rotatable chart member having a chart thereon mounted in the housing below the marking element and normally spaced from the marking tip thereon, the chart member being movable along the longitudinal axis of the housing and upwardly into engagement with the marking tip, whereby the marking tip will make a mark on the chart, mechanism mounted within the housing for moving the chart member at two spaced times into engagement with the marking tip, the chart moving mechanism including means for rotating the chart during the interval between the two times while, simultaneously, insuring that the chart memb

Abstract: Apparatus for determining the inclination of a well bore comprising a flexible rod having an upper end rigidly supported by the apparatus and a needle point means operatively connected with the lower end of said rod and suspended over a vertically movable target. The target is responsive to a predetermined condition, such as time or location, for moving the target relatively towards and against the needle point whereby the needle point will perforate the target to indicate the inclination of the well bore. A weight means is mounted on the flexible rod above the needle point to cause a bending of the rod by cantilever action when the apparatus is in the well bore and when the well bore is inclined with respect to the vertical.