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  • Subsurface Hydraulic Pumps There are two types of hydraulic pumps:

  • Fixed-pump: Downhole pump is attached to the end of the tubing string and run into the well. Power fluid is directed down an inner tubing string, and the produced fluid and the return power fluid flow to the surface inside the annulus between the two tubing strings

  • Free-pump design: Downhole pump is circulated into and out of the well inside the power-fluid tubing string, or they can be installed and retrieved by wireline operations.

  • Jet pumps are a special class of hydraulic subsurface pumps and are sometimes used in place of reciprocating pumps.

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