Method to improve directional survey accuracy

Details Method to improve directional survey accuracy Method to improve directional survey accuracy

E - Fixed Constructions

21

B

33/92

E21B 47/022 (2006.01)

Patent

CA 2010398

METHOD TO IMPROVE DIRECTIONAL SURVEY ACCURACY Abstract A method is proposed for better determining the azimuth and inclination of a borehole in which a priori information regarding the magnitude of the earth's gravitational field strength, it magnetic field strength and direction are utilized to constrain the measured components of the earth's gravitational and magnetic field vectors. The constrained fit method adjusts the accelerometer and the magnetometer tri-axis measurement to optimize agreement between the measure data and the a priori magnetic and gravity field strengths and the magnetic dip angle. The adjustment that is selected is that which produces the least increase in the statistical measure X2.

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