Measuring and testing – Instrument proving or calibrating – Volume of flow – speed of flow – volume rate of flow – or mass...
Patent
1986-02-07
1987-05-05
Levy, Stewart J.
Measuring and testing
Instrument proving or calibrating
Volume of flow, speed of flow, volume rate of flow, or mass...
73 1J, 73151, 364422, 364571, 364562, E21B 4700
Patent
active
046622098
ABSTRACT:
A system for measuring the course length of a well bore uses a probe containing accelerometers to generate a first output signal indicative of the time rate of change of the probe's velocity as it travels through the bore. The probe also contains two casing collar locators separated by a measured distance. A microcomputer in the probe integrates the first output signal twice with respect to time to generate a course length value indicating the total distance travelled by the probe. The microcomputer also calculates a computed distance value by integrating the first output signal twice with respect to time over the time interval between the generation of first and second joint-indicative signals as a result of the successive passage of one pipe joint by the two casing collar locators. The computed distance value is compared by the microcomputer with a stored distance value representing the measured distance between the casing collar locators. From this comparison, a distance error signal is generated and applied as a correction factor to the course length value. In addition, a first acceleration value is calculated using the computed distance value and the joint-indicative signal time interval, and a second acceleration value is calculated using the stored distance value and the same time interval. The first and second acceleration values are compared to yield an acceleration error signal which is applied to the accelerometers for real-time recalibration.
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L. A. Allaud and J. Ringot, "High Resolution Dipmeter Tool", The Log Analyst, May-Jun. 1969, pp. 3-11.
Brown Robert L.
Levy Stewart J.
Noland Tom
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