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  2. Oil well control - Wikipedia

    en.wikipedia.org/wiki/Oil_well_control

    Pump pressure, which is also referred to as system pressure loss, is the sum total of all the pressure losses from the oil well surface equipment, the drill pipe, the drill collar, the drill bit, and annular friction losses around the drill collar and drill pipe. It measures the system pressure loss at the start of the circulating system and ...

  3. Well control - Wikipedia

    en.wikipedia.org/wiki/Well_control

    0.052 * Mud weight (in ppg) * TVD (in feet) During circulation, the pressure applied is due to drilling mud weight and also due to the pressure applied by the mud pumps to circulate the drilling fluid. Pressure under circulating condition = Pressure under static condition + Pressure due to pumping at that point or pressure loss in the system

  4. Measurement while drilling - Wikipedia

    en.wikipedia.org/wiki/Measurement_while_drilling

    Positive-pulse tools briefly close and open the valve to restrict the mud flow within the drill pipe. This produces an increase in pressure that can be seen at surface. The digital information can be encoded in the pressure signal using line codes or pulse-position modulation. [8] Diagram showing the MWD Negative pulse

  5. Drill pipe - Wikipedia

    en.wikipedia.org/wiki/Drill_pipe

    Drill pipe is most often considered premium class, which is 80% remaining body wall (RBW). After inspection determines that the RBW is below 80%, the pipe is considered to be Class 2 or "yellow band" pipe. Eventually the drill pipe will be graded as scrap and marked with a red band. Drill pipe is a portion of the overall drill string.

  6. Barlow's formula - Wikipedia

    en.wikipedia.org/wiki/Barlow's_formula

    Barlow's formula (called "Kesselformel" [1] in German) relates the internal pressure that a pipe [2] can withstand to its dimensions and the strength of its material. This approximate formula is named after Peter Barlow , an English mathematician .

  7. Mud weight - Wikipedia

    en.wikipedia.org/wiki/Mud_weight

    In the oil industry, mud weight is the density of the drilling fluid and is normally measured in pounds per gallon (lb/gal) (ppg) or pound cubic feet (pcf) . [1] In the field it is measured using a mud scale or mud balance. Mud can weigh up to 22 or 23 ppg. A gallon of water typically weighs 8.33 pounds (or 7.48 ppg).

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  9. Casing (borehole) - Wikipedia

    en.wikipedia.org/wiki/Casing_(borehole)

    Casing placement is selected so that the hydrostatic pressure of the drilling fluid remains at a pressure level that is between formation pore pressures and fracture pressures. [ 6 ] [ 5 ] In order to reduce cost, a liner may be used which extends just above the shoe (bottom) of the previous casing interval and hung off downhole rather than at ...