Method and apparatus for mapping the trajectory in the subsurface of a borehole
AssigneeScintrex Limited
InventorHarold Seigel
Life of this patent
Estimating the term…
Abstract
An apparatus for determining the orientation of a borehole at a point along the borehole, includes a tiltmeter for measuring the inclination of the borehole relative to the vertical, a vector magnetic sensor for measuring the amplitude of the component of the Earth's magnetic field along the axis of the borehole, and means for computing the orientation of the tubular sonde from the measurements of inclination and amplitude of the component of the Earth's magnetic field aligned with axis of the sonde.
Claims13
A method of determining the orientation of a borehole at a point along the borehole, comprising:
- measuring the inclination of the borehole relative to the vertical at said point;
- measuring the amplitude of the Earth's magnetic field component that is co-axial with the borehole at said point;
- and
- computing the orientation of the borehole at said point from said two measurements.
An apparatus for determining the orientation of a borehole at a point along the length of the borehole, comprising:
- a substantially tubular sonde having an axis and a diameter suitable for insertion into the borehole;
- a tiltmeter mounted in the sonde for measuring the inclination of the axis of the sonde relative to vertical;
- a vector magnetic sensor mounted in the sonde, including means for measuring the amplitude of the component of the Earth's magnetic field aligned with the axis of the sonde;
- and
- means for computing the orientation of said tubular sonde from said measurements of inclination and amplitude of the component of the Earth's magnetic field aligned with the axis of the sonde.
A method of mapping the trajectory of a borehole comprising:
- at different points along the length of said borehole,
- measuring the inclination of the borehole relative to the vertical at said point;
- measuring the amplitude of the Earth's magnetic field component that is co-axial with the borehole at said point;
- and
- computing the orientation of the borehole at said point from said two measurements;
- and
- mapping the trajectory of said borehole using said computed orientations for said different points.
Dependencies are inferred from the claim text.