Service crew raises tubing string one step or increment, extracting a two-joint stand from the well. At the beginning and at the end of the extraction increment, the tubing string
is stopped (vertical speed is zero). Extraction speed changes or varies during the extraction increment and may include a ramp-up and a ramp-down of speed.
Pitting sensor and pitting ADC continue providing digital signals to the filter module during or throughout the extraction increment. Pitting filter module continues receiving digita! signals, e.g. as samples, words, or snapshots. Each sample characterizes the portion of the tubing that is in the measurement zone at the time of sample
Pitting filter module filters or averages received samples according to extraction speed, noise level, and/or another
criterion or rule
Tubing scanner forwards filtered pitting data to laptop for display to operator, technician, or engineer
Operator observes data on laptop and grades tubing based |^ 380 on an interpretation of his observations
ie full tubing string" >een extracted fnor