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The top drive allows the drilling rig to drill the longer section of a stand of drill pipe in one operation. [1] A rotary table type rig can only drill 30-foot (9.1 m) (single drill pipe) sections of drill pipe whereas a top drive can drill 60–90-foot (18–27 m) stands (double and triple drill pipe respectively, a triple being three joints of drillpipe screwed together), depending on the ...
NOV Inc., formerly National Oilwell Varco, is an American multinational corporation based in Houston, Texas. It is a worldwide provider of equipment and components used in oil and gas drilling and production operations , oilfield services, and supply chain integration services to the upstream oil and gas industry .
Scalar control of an AC electrical motor is a way to achieve the variable speed operation by manipulating the supply voltage or current ("magnitude") and the supply frequency while ignoring the magnetic field orientation inside the motor. [1] Scalar control is based on equations valid for a steady-state operation [2] and is frequently open-loop ...
CBSNews. Updated September 6, 2024 at 9:21 AM. A Japanese 10-year-old has become the youngest person authorized to prepare "fugu" pufferfish — a delicacy that can kill if its poisonous parts are ...
Even the National Weather Service has weighed in on the matter, mapping the path of the “strange smell” on social media. “By tracking winds, we can estimate the path that it may have taken ...
Derrickman: The third in command after the driller & assistant driller; handles the top end of drill string on round trips. Dope: A thick lubricant used on pipe connections. Drill string: A column, or string, of pipe that transmits drilling fluid (via the mud pumps) and torque (from the Kelly drive or top drive) to the drill bit.
Quick Facts. On an annual basis, weighting restrictions are applied such that no related group of commodities constitutes more than 33% of the index and no single commodity constitutes more than 15% or less than 2% of the index. Between rebalancings, weightings may fluctuate to levels outside these limits. CME Group Index Services LLC 2011.
Vector control, also called field-oriented control (FOC), is a variable-frequency drive (VFD) control method in which the stator currents of a three-phase AC or brushless DC electric motor are identified as two orthogonal components that can be visualized with a vector. One component defines the magnetic flux of the motor, the other the torque.