SYSTEM AND METHOD FOR MEASUREMENTS OF DEPTH AND VELOCITY OF INSTRUMENTATION WITHIN A WELLBORE
First Claim
1. A survey tool for use in a wellbore, the survey tool comprising:
- a downhole portion having an axis, the downhole portion adapted to move within the wellbore with the axis generally parallel to the wellbore;
a first acceleration sensor mounted at a first position within the downhole portion, the first acceleration sensor adapted to generate a first signal indicative of an acceleration of the first acceleration sensor along the axis;
a second acceleration sensor mounted at a second position within the downhole portion, the second position being spaced from the first position by a non-zero distance along the axis, the second acceleration sensor adapted to generate a second signal indicative of an acceleration of the second acceleration sensor along the axis; and
a controller adapted to receive the first signal and the second signal and to calculate a depth, a velocity, or both a depth and a velocity of the downhole portion in response to the first signal and the second signal.
1 Assignment
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Accused Products
Abstract
A survey tool for use in a wellbore includes a downhole portion having an axis. The downhole portion is adapted to move within the wellbore with the axis generally parallel to the wellbore. The survey tool further includes a first acceleration sensor mounted at a first position within the downhole portion. The first acceleration sensor is adapted to generate a first signal indicative of an acceleration of the first acceleration sensor along the axis. The survey tool further includes a second acceleration sensor mounted at a second position within the downhole portion. The second position is spaced from the first position by a non-zero distance along the axis. The second acceleration sensor is adapted to generate a second signal indicative of an acceleration of the second acceleration sensor along the axis. The survey tool further includes a controller adapted to receive the first signal and the second signal and to calculate a depth, a velocity, or both a depth and a velocity of the downhole portion in response to the first signal and the second signal.
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Citations
20 Claims
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1. A survey tool for use in a wellbore, the survey tool comprising:
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a downhole portion having an axis, the downhole portion adapted to move within the wellbore with the axis generally parallel to the wellbore;
a first acceleration sensor mounted at a first position within the downhole portion, the first acceleration sensor adapted to generate a first signal indicative of an acceleration of the first acceleration sensor along the axis;
a second acceleration sensor mounted at a second position within the downhole portion, the second position being spaced from the first position by a non-zero distance along the axis, the second acceleration sensor adapted to generate a second signal indicative of an acceleration of the second acceleration sensor along the axis; and
a controller adapted to receive the first signal and the second signal and to calculate a depth, a velocity, or both a depth and a velocity of the downhole portion in response to the first signal and the second signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for determining a depth of a downhole portion of a survey tool along a wellbore, the method comprising:
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providing a survey tool comprising a downhole portion, the downhole portion comprising a first acceleration sensor and a second acceleration sensor, the first acceleration sensor adapted to generate a first signal indicative of an acceleration of the first acceleration sensor along the wellbore, the second acceleration sensor adapted to generate a second signal indicative of an acceleration of the second acceleration sensor along the wellbore, the second acceleration sensor spaced from the first acceleration sensor by a non-zero distance;
receiving the first signal and the second signal while the downhole portion is at a first location within the wellbore;
receiving the first signal and the second signal while the downhole portion is at a second location within the wellbore; and
calculating a depth of the downhole portion of the survey tool in response to the first signal and the second signal received while the downhole portion is at the first location and in response to the first signal and the second signal received while the downhole portion is at the second location.
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- 16. The method of claim 16, wherein the downhole portion is stationary while at the first location.
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20. A method for determining a velocity of a downhole portion of a survey tool along a wellbore, the method comprising:
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providing a survey tool comprising a downhole portion, the downhole portion comprising a first acceleration sensor and a second acceleration sensor, the first acceleration sensor adapted to generate a first signal indicative of an acceleration of the first acceleration sensor along the wellbore, the second acceleration sensor adapted to generate a second signal indicative of an acceleration of the second acceleration sensor along the wellbore, the second acceleration sensor spaced from the first acceleration sensor by a non-zero distance;
receiving the first signal and the second signal while the downhole portion is at a first location within the wellbore;
receiving the first signal and the second signal while the downhole portion is at a second location within the wellbore; and
calculating a velocity of the downhole portion of the survey tool in response to the first signal and the second signal received while the downhole portion is at the first location and in response to the first signal and the second signal received while the downhole portion is at the second location.
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Specification