Viscosity control and filtration of well fluids

Details Viscosity control and filtration of well fluids Viscosity control and filtration of well fluids

2007-05-21

2010-06-15

Savage, Matthew O (Department: 1797)

Liquid purification or separation

Processes

Including controlling process in response to a sensed condition

C210S742000, C210S748020, C210S805000, C175S066000, C166S252500, C159S047300

Reexamination Certificate

active

07736521

ABSTRACT:
Circulating completion, workover and drilling fluids used in hydrocarbon recovery are filtered after monitoring for viscosity, which frequently causes plugging of filters. A viscometer generates a signal representative of viscosity in the fluid; the signal is used by a programmable controller to divert viscous fluid from the filter, or to take other action to prevent damage to the filter. The viscometer can be used in various positions in the system. Fluids deemed too viscous for the filter can be sent to a viscosity-reducing device, which may be a heating, shear-thinning, or cavitation device, to reduce its viscosity, enabling the fluid to pass through a filter without fouling. After filtering and a return to a lower temperature, the fluid may be treated if necessary to become viscous again for a useful purpose.

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