US 9,810,060 B2
Controlling formation tester probe extension force
Kristopher V. Sherrill, Thousand Oaks, CA (US)
Assigned to Halliburton Energy Services, Inc., Houston, TX (US)
Appl. No. 14/360,266
Filed by Kristopher V. Sherrill, Thousand Oaks, CA (US)
PCT Filed Jul. 2, 2012, PCT No. PCT/US2012/045242
§ 371(c)(1), (2), (4) Date May 22, 2014,
PCT Pub. No. WO2014/007799, PCT Pub. Date Jan. 9, 2014.
Prior Publication US 2014/0311234 A1, Oct. 23, 2014
Int. Cl. E21B 49/10 (2006.01); E21B 49/00 (2006.01); E21B 44/06 (2006.01)
CPC E21B 49/00 (2013.01) [E21B 44/06 (2013.01); E21B 49/10 (2013.01)] 33 Claims
OG exemplary drawing
 
1. A formation tester for use in a well located in a subterranean formation, comprising:
a probe extendable within the well to contact the formation;
a piston connected to the probe and positioned with a housing comprising first and second chambers separated by the piston;
a pump coupled to and in fluid communication with the first and second chambers;
an adjustable flow control device coupled between and in fluid communication with the pump and the first chamber, wherein the adjustable flow control device comprises a servo-controlled valve and is configured to limit an extension pressure applied to extend the probe; and
a position sensor configured to measure a displacement rate of the probe.