Downhole surveying utilizing multiple measurements
First Claim
1. A measurement system having a downhole portion configured to move within a wellbore, the downhole portion having a first portion and a second portion, the first portion configured to be oriented at a first angle relative to the wellbore at a first position and the second portion configured to be oriented at a second angle relative to the wellbore at a second position, wherein at least one of the first angle and the second angle is non-zero, the measurement system comprising:
- a first sensor mounted within the first portion, the first sensor configured to generate a first signal indicative of the orientation of the first portion relative to the Earth;
a second sensor mounted within the second portion, the second sensor configured to generate a second signal indicative of the orientation of the second portion relative to the Earth; and
a controller configured to receive the first signal and the second signal and to calculate a difference between the first angle and the second angle.
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Accused Products
Abstract
Certain embodiments described herein provide a measure of the misalignment of multiple acceleration sensors mounted in the downhole portion of a drill string. In certain embodiments, the measure of the misalignment corresponds to a measure of sag which can be used to provide an improved estimate of the inclination of the downhole portion of the drill string and/or the wellbore. Certain embodiments described herein provide an estimate of the magnetic interference incident upon a drilling system using multiple magnetic sensors mounted within a non-magnetic region of the downhole portion of the drilling system. Certain embodiments utilize the magnetic measurements to determine an axial interference resulting from one or more magnetic portions of the downhole portion and to provide an improved estimate of the azimuthal orientation of the downhole portion with respect to the magnetic field of the Earth.
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Citations
14 Claims
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1. A measurement system having a downhole portion configured to move within a wellbore, the downhole portion having a first portion and a second portion, the first portion configured to be oriented at a first angle relative to the wellbore at a first position and the second portion configured to be oriented at a second angle relative to the wellbore at a second position, wherein at least one of the first angle and the second angle is non-zero, the measurement system comprising:
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a first sensor mounted within the first portion, the first sensor configured to generate a first signal indicative of the orientation of the first portion relative to the Earth; a second sensor mounted within the second portion, the second sensor configured to generate a second signal indicative of the orientation of the second portion relative to the Earth; and a controller configured to receive the first signal and the second signal and to calculate a difference between the first angle and the second angle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of determining the misalignment between a first sensor and a second sensor within a wellbore, the method comprising:
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receiving one or more signals from the first sensor indicative of an orientation relative to the Earth of the first sensor at a first position within the wellbore, the first sensor oriented at a first angle relative to the wellbore at the first position; receiving one or more signals from the second sensor indicative of an orientation relative to the Earth of the second sensor at a second position within the wellbore, the second sensor oriented at a second angle relative to the wellbore at the second position, wherein at least one of the first angle and the second angle is non-zero; and calculating the difference between the first angle and the second angle in response to the one or more signals from the first sensor and the one or more signals from the second sensor.
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11. A measurement system having a downhole portion configured to move within a first wellbore, the downhole portion comprising at least one magnetic region, the measurement system comprising:
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a first magnetic sensor and a second magnetic sensor spaced apart from one another by a non-zero distance, the first magnetic sensor configured to generate a first signal in response to magnetic fields of the Earth and of the at least one magnetic region, the second magnetic sensor configured to generate a second signal in response to magnetic fields of the Earth and of the at least one magnetic region; and a controller configured to receive the first signal and the second signal and to calculate information regarding the magnetic field of the at least one magnetic region. - View Dependent Claims (12, 13, 14)
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Specification