Devices and methods for extraction, transportation and/or...

Dispenser for oil well treating chemicals

Double-acting reciprocating downhole pump

Double-acting, deep-well fluid extraction pump

Downhole tool for use with a ball and seat traveling valve for a

Extraction system with a pump having an elastic rebound inner tu

Extraction system with a pump having an elastic rebound inner tu

Gas restrictor for horizontally oriented pump

Open well plunger-actuated gas lift valve and method of use

Pumped oil well bottom safety valve

Pumping from two levels of a pool of production fluid, and...

Pumping from two levels of a pool of production fluid, and...

Self actuated intake valve assembly for insert subsurface recipr

Sonde for taking fluid samples, in particular from inside an oil

Wellbore mechanism for liquid and gas discharge