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Line 42: − A hydraulic pump operates similarly to a gas lift system, with high pressure power fluid used as the energy source in place of high pressure gas. There are two different types of hydraulic pumps: piston and jet. A piston type pump assembly consists of a hydraulically operated motor at one end and a plunger type pump at the other end (Figure 3). High pressure hydraulic fluid is pumped down the tubing string and enters a reciprocating hydraulic motor. This motor activates the piston type pump which lifts the produced fluids and hydraulic fluid up the casing annulus toward the surface. The hydraulic fluid most commonly used is produced oil from the well itself. When the produced fluids and hydraulic fluid are pumped to the surface, the oil is separated and some of the oil is reused as the power fluid.+ − +
→Hydraulic pumps
==Hydraulic pumps==
==Hydraulic pumps==
[[file:artificial-lift_fig3.png|thumb|left|{{figure number|3}}Hydraulic piston pump. (From <ref name=pt09r5 />.)]]
[[file:artificial-lift_fig3.png|thumb|{{figure number|3}}Hydraulic piston pump. (From <ref name=pt09r5 />.)]]
A hydraulic pump operates similarly to a gas lift system, with high pressure power fluid used as the energy source in place of high pressure gas. There are two different types of hydraulic pumps: piston and jet. A piston type pump assembly consists of a hydraulically operated motor at one end and a plunger type pump at the other end ([[:file:artificial-lift_fig3.png|Figure 3]]). High pressure hydraulic fluid is pumped down the tubing string and enters a reciprocating hydraulic motor. This motor activates the piston type pump which lifts the produced fluids and hydraulic fluid up the casing annulus toward the surface. The hydraulic fluid most commonly used is produced oil from the well itself. When the produced fluids and hydraulic fluid are pumped to the surface, the oil is separated and some of the oil is reused as the power fluid.
The hydraulic jet pump system uses a ventura pressure drop to commingle the power hydraulic fluid and the produced fluids. The jet pump system does not require the hydraulic fluid to be as clean as that for the piston type system. The jet system also allows for wider production rates than does the piston type pump system. Hydraulic pumps are used primarily in deep wells requiring lift volumes greater than those capable from beam pump systems.
The hydraulic jet pump system uses a ventura pressure drop to commingle the power hydraulic fluid and the produced fluids. The jet pump system does not require the hydraulic fluid to be as clean as that for the piston type system. The jet system also allows for wider production rates than does the piston type pump system. Hydraulic pumps are used primarily in deep wells requiring lift volumes greater than those capable from beam pump systems.