Schlumberger Technology Corporation

Simon Ross

Alexander F Zazovsky

Mark Milkovisch

Pierre Henri Campanac

An apparatus comprising first and second fluid intakes, a pump, and a sample chamber, may be positioned in a borehole penetrating a subterranean formation. A method of use thereof may comprise drawing fluid from the subterranean formation and into the first and second fluid intakes using the pump, discharging into the borehole at least a portion of the fluid drawn into the second fluid intake, and selectively diverting at least a portion of the fluid drawn into the first fluid intake to the sample chamber.

Single pump focused sampling

A method according to one or more aspects of the present disclosure includes moving a piston of a displacement unit to pump a fluid through first and second flowlines hydraulically connected to the displacement unit through a valve network. The method also includes monitoring flowing pressure in the first flowline and monitoring pressure in a first chamber of the displacement unit. The method further includes opening a first active valve of the valve network in response to the monitored pressure in the first chamber being about equal to or less than the monitored flowing pressure in the first flowline.

Downhole formation tester apparatus and methods

A method according to one or more aspects of the present disclosure comprises disposing a tool in a wellbore, the tool comprising a displacement unit for pumping a fluid at least partially through the tool, a first flowline hydraulically connected to the displacement unit through a valve network, and a second flowline hydraulically connected to the displacement unit; pumping a fluid from the first flowline to the second flowline; monitoring a pressure at a chamber of the displacement unit; and monitoring flowing pressure in the first flowline across the valve network from the displacement unit.

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Tunbridge Wells, United Kingdom

Simon Ross