Method for detecting drillstring washouts

Details Method for detecting drillstring washouts Method for detecting drillstring washouts

G - Physics

01

N

G01N 11/04 (2006.01) E21B 21/08 (2006.01) E21B 44/00 (2006.01)

Patent

CA 2095583

A method of detecting a drillstring washout during an operation involving the addition or removal of pipes from the drillstring such as back reaming, comprising: a) performing at least one such operation and determining by hydraulic coefficient k from the relationship P = kQ a, where Q is the flow rate, P is the standpipe pressure and a is the flow exponent, from each pipe added or removed, so as to derive a series of values indicating the development of k for said operations, and b) on subsequent operations, determining k and comparing the determined values with the series obtained previously, a drillstring washout being detected when the determined value of k falls substantially below the corresponding value of k in the series. The trend in the development of k can be calculated and used to determine if an anomaly exists in the determined value of k.

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