دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: the cutting or boring element used in drilling oil and gas wells. The bit consists of a cutting element and a circulating element. The cutting element is steel teeth, tungsten carbide buttons, industrial diamonds, or polycrystalline diamonds (PDCs). The circulating element permits the passage of drilling fluid and utilises the hydraulic force of the fluid stream to improve drilling rates. In rotary drilling, several drill collars are joined to the bottom end of the drill pipe column, and the bit is attached to the end of the drill collars.

a drill bit, commonly either a roller cone, button bit, PDC, diamond or drag bit, used with a rotary string or a mud motor to drill through rock.

chemical drag reducer.

n: a pump with an impeller An electric submersible pump is a centrifugal pump.

n: A machine for moving fluid by spinning it using a rotating impeller in a pump casing with a central inlet and a tangential outlet. The path of the fluid is an increasing spiral from the inlet at the center to the outlet, tangent to the annulus. In the ann

pump with an impeller or rotor that spins in a housing and the drag forces on the fluids cause them to flow.

n pi: see captive customers. core cutter head n: the cutting element of the core barrel assembly. In design it corresponds to one of the three main types of bits: drag bits with blades for cutting soft formations;roller bits with rotating cutters for cutting medium-hard formations;and diamond bits for cutting very hard formations.

n: the block in a mud pump that is guided to move in a straight line and serves as a connection between the pony rod and the Commenting rod.

n: The scroll box of drill pump, moving along guide in right line. Used to connect drag link and pitman.

n: The high density cement slurry manufactured by adding drag reducer into cement slurry and decreasing water.

n: The drill bit whose stepped appearance blades are set with diamond.

n: The drag bit whose end is conical contour or rhombus.

drag reduction agent.

n: 1. an excess of draft at the stem of a ship or drill ship, as compared to the bow.2.friction between a moving device (such as a bit) and another moving or nonmoving part (such as the formation). 3. the bending of rock strata adjacent to a fault.

n: The extra force required to move the drill string owing to the drill strings being in contact with the wall of the borehole.