Method of correcting for axial and transverse error components i

Details Method of correcting for axial and transverse error components i Method of correcting for axial and transverse error components i

1995-10-23

1996-10-15

Cuchlinski, Jr., William A.

Geometrical instruments

Indicator of direction of force traversing natural media

Process

33304, 33313, E21B 47022

Patent

active

055641938

ABSTRACT:
A method is disclosed for determining wellbore azimuth accurately, notwithstanding the corrupting influence of axial and transverse magnetic field biasing error components.
A reliable value of the axial magnetic field component (B.sub.x) is determined by minimizing the vector distance between B (as measured) and its expected value B. Preferably, this is accomplished utilizing a method of radicals to solve a quadratic equation.
Given a reliable B.sub.x, the transverse magnetic field components (B.sub.x and B.sub.x) can be determined from taking a number of surveys as the drillstring is rotated about. B.sub.x and B.sub.x can be determined by utilizing the assumption that the transverse magnetic field components should remain invariant as the drillstring is rotated.

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