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2. Mud motor - Wikipedia

   en.wikipedia.org/wiki/Mud_motor

   A mud motor (or drilling motor) is a progressive cavity positive displacement pump (PCPD) placed in the drill string to provide additional power to the bit while drilling. The PCPD pump uses drilling fluid (commonly referred to as drilling mud, or just mud) to create eccentric motion in the power section of the motor which is transferred as ...

3. Progressing cavity pump - Wikipedia

   en.wikipedia.org/wiki/Progressing_cavity_pump

   A progressing cavity pump is a type of positive displacement pump and is also known as a progressive cavity pump, progg cavity pump, eccentric screw pump or cavity pump.It transfers fluid by means of the progress, through the pump, of a sequence of small, fixed shape, discrete cavities, as its rotor is turned.

4. Gerotor - Wikipedia

   en.wikipedia.org/wiki/Gerotor

   A gerotor / dʒ ə ˈ r oʊ t ə r / is a positive displacement pump. The name gerotor is derived from "generated rotor." A gerotor unit consists of an inner and an outer rotor. The inner rotor has n teeth, while the outer rotor has n + 1 teeth, with n defined as a natural number greater than or equal to 2. The axis of the inner rotor is offset ...

5. Pump - Wikipedia

   en.wikipedia.org/wiki/Pump

   A positive-displacement pump must not operate against a closed valve on the discharge side of the pump, because it has no shutoff head like centrifugal pumps. A positive-displacement pump operating against a closed discharge valve continues to produce flow and the pressure in the discharge line increases until the line bursts, the pump is ...

6. Mud pump - Wikipedia

   en.wikipedia.org/wiki/Mud_pump

   A mud pump (sometimes referred to as a mud drilling pump or drilling mud pump), is a reciprocating piston/plunger pump designed to circulate drilling fluid under high pressure (up to 7,500 psi or 52,000 kPa) down the drill string and back up the annulus. A mud pump is an important part of the equipment used for oil well drilling.

7. Positive displacement - Wikipedia

   en.wikipedia.org/wiki/Positive_displacement

   Positive displacement may refer to: Positive displacement pump; Positive displacement meter; Positive displacement pipette This page was last edited on 18 ...