Field upgrading of heavy oil and bitumen

Field-assemblable bow-spring casing centralizer and method...

Field-installable rod guide

Fill up and circulation tool and mudsaver valve

Fill up tool and mud saver for top drives

Fill valve

Filter apparatus for use in water wells

Filter assembly having a bypass passageway and method

Filter cake degradation compositions and associated methods

Filter for separating discrete solid elements from a fluid...

Filter for subterranean use

Filter for subterranean use

Filter for subterranean wells

Filter for subterranean wells

Filter raiser for filtered infiltration well

Filtered actuator port for hydraulically actuated downhole...

Filtering and detection of telemetry

Filtering tube provided with slotted perforations and...

Filters for canceling multiple noise sources in borehole...

Fine particle size cement compositions and methods