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Class Information
Number: 33/302
Name: Geometrical instruments > Indicator of direction of force traversing natural media > Process > Borehole or tube interior study
Description: Process involving the study of the interior of a borehole or tube.

Patents under this class:
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Patent Number Title Of Patent Date Issued
8141259 Method of determining the dip of a formation Mar. 27, 2012
8141635 Cased borehole tool orientation measurement Mar. 27, 2012
8065813 Excavation device and profile analyses of the excavation itself and associated method Nov. 29, 2011
8061047 Active positioning of downhole devices using spherical motors Nov. 22, 2011
7975392 Downhole tool Jul. 12, 2011
7921573 Monitoring verticality of a sinking caisson Apr. 12, 2011
7685732 Orientation sensing apparatus and a method for determining an orientation Mar. 30, 2010
7530176 Method and apparatus for monitoring element alignment May. 12, 2009
7475486 Creep determination technique Jan. 13, 2009
7386942 Method and apparatus for mapping the trajectory in the subsurface of a borehole Jun. 17, 2008
7347003 Device to measure axial displacement in a borehole Mar. 25, 2008
7080460 Determining a borehole azimuth from tool face measurements Jul. 25, 2006
6860029 Length adjustable tool for aligning boring bar Mar. 1, 2005
6704436 Method of obtaining a developed two-dimensional image of the wall of a borehole Mar. 9, 2004
6487782 Method and apparatus for use in creating a magnetic declination profile for a borehole Dec. 3, 2002
6339886 Remotely measured caliper for wellbore fluid sample taking instrument Jan. 22, 2002
6065218 Method and apparatus for logging non-circular boreholes May. 23, 2000
6065219 Method and apparatus for determining the shape of an earth borehole and the motion of a tool within the borehole May. 23, 2000
6026582 Methods and apparatus for mapping pipe and valve bores in a nuclear reactor Feb. 22, 2000
6021577 Borehole surveying Feb. 8, 2000
5903147 Eddy current array inspection device for shaped holes May. 11, 1999
5806195 Rate gyro wells survey system including nulling system Sep. 15, 1998
5657547 Rate gyro wells survey system including nulling system Aug. 19, 1997
5640780 Moving device for intervening inside small-diameter pipework Jun. 24, 1997
5564193 Method of correcting for axial and transverse error components in magnetometer readings during wellbore survey operations Oct. 15, 1996
5548900 Measuring instruments Aug. 27, 1996
5543972 Mirror for producing a development picture of the wall of a borehole in the ground and device therefor Aug. 6, 1996
5469736 Apparatus and method for measuring a borehole Nov. 28, 1995
5442284 Process for inspecting spacers of heat exchanger tubes in a heat exchanger Aug. 15, 1995
5398421 Method for connecting magnetic measurements performed in a well through a measuring device in order to determine the azimuth thereof Mar. 21, 1995
5329691 Hole probe apparatus Jul. 19, 1994
5155916 Error reduction in compensation of drill string interference for magnetic survey tools Oct. 20, 1992
5128867 Method and apparatus for determining inclination angle of a borehole while drilling Jul. 7, 1992
5012412 Method and apparatus for measurement of azimuth of a borehole while drilling Apr. 30, 1991
4992735 System and method for inspecting metallic plugs in heat exchanger tubes using a radially extendible probe Feb. 12, 1991
4956921 Method to improve directional survey accuracy Sep. 18, 1990
4935883 Apparatus and method for leveling a gravity measurement device Jun. 19, 1990
4930223 Bend detector pig Jun. 5, 1990
4852262 Gauge for in situ measurement of borehole diameter Aug. 1, 1989
4851773 Rotating head profilometer probe Jul. 25, 1989
4835876 Instrument chassis and body supports for pipeline survey pig Jun. 6, 1989
4833787 High speed well surveying and land navigation May. 30, 1989
4799391 Method for surveying fluid transmission pipelines Jan. 24, 1989
4780962 Pipeline bend verification pig Nov. 1, 1988
4761889 Method for the detection and correction of magnetic interference in the surveying of boreholes Aug. 9, 1988
4698911 Method of using a borehole televiewer dipmeter for determining true dip and azimuth Oct. 13, 1987
4682421 Method for determining the azimuth of a borehole Jul. 28, 1987
4677865 Pipe pig with running gear Jul. 7, 1987
4672752 Method of determining the difference in borehole azimuth at successive points Jun. 16, 1987
4625165 Tube inspection probe with rotating eddy current coil Nov. 25, 1986

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