Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Earth science
Patent
1999-01-15
2000-03-28
Oda, Christine K.
Data processing: measuring, calibrating, or testing
Measurement system in a specific environment
Earth science
702 6, G06F 1900
Patent
active
06044326&
ABSTRACT:
An apparatus and method for measuring the size of a borehole while drilling are disclosed. The apparatus includes a gamma ray source configured to direct gamma rays into a formation, a far gamma ray detector and a near gamma ray detector configured to detect gamma rays originating in the formation and a far gamma ray counter and a near gamma ray counter coupled to the far gamma ray detector and the near gamma ray detector, respectively. The apparatus also includes a sampler coupled to the gamma ray counters configured to take and store samples from the counters, the sampler configured to reset the counter when a sample is taken. The apparatus includes a density computer for computing far density and near density for each sample, a standoff computer for computing the standoff for each sample from the far density for that sample, a formation density and a mud density, and a borehole size computer for adding the maximum standoff, the minimum standoff and the diameter of the apparatus. An algorithm which "bins" the samples before computing standoff is also claimed.
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Birchak, J.R. et al, "Standoff and Caliper Measurements While Drilling Using A New Formation-Evaluation Tool With Three Ultrasonic Transducers", 68th Annual Technical Conference and Exhibition of the Society of Petroleum Engineers, Houston, Texas, Oct. 3-6, 1993, pp. 793-806.
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Dresser Industries Inc.
Oda Christine K.
Speight Howard L.
Taylor Victor J.
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