E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
354/25, 33/92
E21B 47/02 (2006.01) E21B 47/022 (2006.01) G01C 19/64 (2006.01)
Patent
CA 1199113
S P E C I F I C A T I O N "Improvements in or Relating to Surveying of a Borehole" ABSTRACT OF THE DISCLOSURE A borehole is surveyed by positioning at the mouth of the borehole a survey instrument having a casing and a three-axis rate gyroscope unit mounted within the casing, and sensing at least two components of gravity in at least two mutually transverse directions with respect to the survey instrument by means of a gravity sensor unit. The survey instrument is then moved along the borehole with the start and finish of the run being at the mouth of the borehole or at some known reference along the path of the borehole. During the run the rates of rotation about three non- coplanar axes are sensed at a series of locations along the length of the borehole by means of the rate gyro- scope unit. The position of the borehole at each measuring location is then calculated by determining the initial set of direction cosines from the sensed gravity components and an assumed initial value of the azimuth angle and incrementing these values using the rates of rotation sensed by the rate gyroscope unit to obtain the sets of direction cosines at subsequent measuring locations.
435826
Russell Anthony W.
Russell Michael K.
Nl Sperry-Sun Inc.
Robic Robic & Associes/associates
LandOfFree
Surveying of a borehole does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Surveying of a borehole, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Surveying of a borehole will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1223700