System and method for measuring depth and velocity of instrumentation within a wellbore using a bendable tool
First Claim
1. An apparatus for use in a wellbore, the apparatus comprising:
- a downhole portion configured to move within the wellbore in a direction generally parallel to the wellbore, the downhole portion comprising;
a first acceleration sensor configured to generate at least one first signal indicative of a first acceleration in a first direction generally parallel to the wellbore;
a second acceleration sensor spaced from the first acceleration sensor, the second acceleration sensor configured to generate at least one second signal indicative of a second acceleration in a second direction generally parallel to the wellbore; and
a sensor configured to generate at least one third signal indicative of a bend between the first direction and the second direction; and
the apparatus further comprising a controller configured to calculate a depth along the wellbore, a velocity along the wellbore, or both a depth and a velocity along the wellbore of the downhole portion in response to the at least one first signal, the at least one second signal, and the at least one third signal, and independently of errors from surface measurements.
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Abstract
An apparatus and method for measuring depth, velocity, or both depth and velocity of instrumentation within a wellbore is provided. The apparatus includes a downhole portion movable within the wellbore in a direction generally parallel to the wellbore. The apparatus further includes a first acceleration sensor mounted at a first position within the downhole portion. The first acceleration sensor generates a first signal indicative of a first acceleration in a first direction generally parallel to the wellbore at the first position. The apparatus further includes a second acceleration sensor mounted at a second position within the downhole portion. The second acceleration sensor generates a second signal indicative of a second acceleration in a second direction generally parallel to the wellbore at the second position. The apparatus further includes a bend sensor generating a third signal indicative of an amount of bend of at least a portion of the downhole portion.
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Citations
20 Claims
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1. An apparatus for use in a wellbore, the apparatus comprising:
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a downhole portion configured to move within the wellbore in a direction generally parallel to the wellbore, the downhole portion comprising; a first acceleration sensor configured to generate at least one first signal indicative of a first acceleration in a first direction generally parallel to the wellbore; a second acceleration sensor spaced from the first acceleration sensor, the second acceleration sensor configured to generate at least one second signal indicative of a second acceleration in a second direction generally parallel to the wellbore; and a sensor configured to generate at least one third signal indicative of a bend between the first direction and the second direction; and the apparatus further comprising a controller configured to calculate a depth along the wellbore, a velocity along the wellbore, or both a depth and a velocity along the wellbore of the downhole portion in response to the at least one first signal, the at least one second signal, and the at least one third signal, and independently of errors from surface measurements. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for generating information indicative of a depth along a wellbore or a velocity along a wellbore, or both a depth and a velocity along a wellbore, of a tool configured to move within a wellbore, the method comprising:
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using a first acceleration sensor of the tool to generate at least one first signal indicative of a first acceleration generally parallel to the wellbore; using a second acceleration sensor of the tool to generate at least one second signal indicative of a second acceleration generally parallel to the wellbore; using a sensor to generate at least one third signal indicative of a bend of the tool; calculating a depth along the wellbore, or a velocity along the wellbore, or both a depth along the wellbore and a velocity along the wellbore of the tool in response to the at least one first signal, the at least one second signal, and the at least one third signal, and independent of errors from surface measurements. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A controller configured to receive signals from a tool configured to move within a wellbore, the controller comprising:
one or more processors configured to calculate a depth of a wellbore, or a velocity along the wellbore, or both a depth along the wellbore and a velocity along the wellbore of the tool, the one or more processors performing the calculation in response to at least one first signal, at least one second signal, and at least one third signal and independently of errors from surface measurements, wherein the at least one first signal is indicative of a first acceleration generally parallel to the wellbore, the at least one second signal is indicative of a second acceleration generally parallel to the wellbore, and the at least one third signal is indicative of a bend of the tool. - View Dependent Claims (16, 17, 18, 19, 20)
Specification