1
Elan Yogeswaren: Acoustic sensor for downhole measurement tool. PathFinder Energy Services, May 2, 2006: US07036363 (41 worldwide citation)

An acoustic sensor for use in a downhole measurement tool is provided. The acoustic sensor includes a piezo-composite transducer element. In various exemplary embodiments, the acoustic sensor further includes a composite backing layer, at least one matching layer, and a barrier layer deployed at an ...


2
William C Paluch, Michael J Moody: Pressure controlled fluid sampling apparatus and method. PathFinder Energy Services, August 1, 2006: US07083009 (40 worldwide citation)

A formation fluid sampling tool including at least one sample tank mounted in a tool collar. The tool collar includes a through bore and is disposed to be operatively coupled with a drill string such that each sample tank may receive a correspondingly preselected formation fluid sample without remov ...


3
Graham McElhinney: Downhole referencing techniques in borehole surveying. PathFinder Energy Services, April 19, 2005: US06882937 (30 worldwide citation)

A method for determining rotational offset between first and second gravity measurement devices deployed on a downhole tool is disclosed. The method includes positioning the tool in a previously surveyed section of a borehole that provides a historical survey including at least three previously surv ...


4
Graham McElhinney: Well twinning techniques in borehole surveying. PathFinder Energy Services, January 10, 2006: US06985814 (27 worldwide citation)

A method for surveying a borehole is provided. The method includes providing a tool having a magnetic field measurement device disposed thereon and positioning the tool in a borehole. Magnetic interference vectors are determined at at least two positions in the borehole by comparing the measured mag ...


5
Michael J Moody, William C Paluch: Sprung member and actuator for downhole tools. PathFinder Energy Services, July 13, 2004: US06761232 (23 worldwide citation)

A downhole tool for use in a well bore is provided. The tool includes a tool body and at least one elongated sprung member deployed on an outer surface thereof. The sprung member is configured to lie in a rest position substantially parallel to the outer surface and further includes at least one mov ...


6
Robert A Moore: Well logging apparatus for obtaining azimuthally sensitive formation resistivity measurements. PathFinder Energy Services, October 14, 2008: US07436184 (22 worldwide citation)

An apparatus for making azimuthally sensitive resistivity measurements of a subterranean formation is disclosed. The apparatus includes a magnetically permeably ring deployed about an electrically conductive tool body. An AC voltage supply is coupled to the tool body on opposing sides of the magneti ...


7
Frank A Wallace: Electrical connector useful in wet environments. PathFinder Energy Services, July 11, 2006: US07074064 (21 worldwide citation)

A multiple contact electrical connector for interconnecting multiple power and/or communication transmission lines is provided. The invention is particularly useful in wet environments. The electrical connector includes male and female connector assemblies. A male pin assembly having a plurality of ...


8
Samuel Mark Haugland: Enhanced measurement of azimuthal dependence of subterranean parameters. PathFinder Energy Services, April 11, 2006: US07027926 (19 worldwide citation)

A method for estimating an azimuthal dependence of a parameter of a borehole using logging sensor measurements acquired as a function of azimuth of the logging sensors is provided. The method includes acquiring at least one logging sensor measurement and a corresponding azimuth from a downhole tool. ...


9
Elan Yogeswaren: Piezocomposite transducer for a downhole measurement tool. PathFinder Energy Services, April 7, 2009: US07513147 (18 worldwide citation)

An acoustic sensor for use in a downhole measurement tool includes a piezo-composite transducer element. In various exemplary embodiments, the acoustic sensor further includes a composite backing layer, at least one matching layer, and a barrier layer deployed at an outermost surface of the sensor. ...


10
Junichi Sugiura: Linear position sensor for downhole tools and method of use. PathFinder Energy Services, May 27, 2008: US07377333 (16 worldwide citation)

Aspects of this invention include a downhole tool having first and second members disposed to translate substantially linearly with respect to one another. A magnet is deployed on the first member and a plurality of magnetic field sensors is deployed on the second member. The magnetic field sensors ...