Method proposed for calibrating MFL, UT ILI tools

09/13/2004
A new statistical method has been developed and successfully tested for calibrating magnetic-flux-leakage and ultrasonic in-line inspection tools from field verifications.In contrast to the methods so far available in the literature, the method proposed here can estimate the measurement errors of the ILI and field tools for both constant and nonconstant bias error-in-variables (EIV) models.The information required to identify the EIV model that describes the comparison of the ILI depth readings with the field measurements can be easily derived from the sizing accuracy claimed for the ILI and field tools. New ILI-tool rejecting criteria are proposed, and it is shown that to reject an ILI r...
read-story

Why Register?

Non-subscribers can only view whitepapers by providing name, home and email address, phone number and other information and comment on/rate articles.

Why Subscribe?

Oil & Gas Journal subscribers with login credentials can access these premium features of OGJ Online:

  • Current Issue – an html version of the current week's issue of Oil & Gas Journal.
  • Past Issues – An Electronic OGJ Archive. A keyword-searchable archive of all issues of Oil & Gas Journal dating back to 1990; also searchable by issue date.
  • Market Journal – a weekly round-up of the oil and gas markets, with observations from leading analysts.
  • Editor's Perspective – a short article of insight and opinion by the Editor of Oil & Gas Journal.
  • OGJ Industry Stats – quick access to current industry statistics from Oil & Gas Journal.
  • OGJ Survey Downloads - quick access to exclusive reports from Oil & Gas Journal.

 

Subscriber Help or Subscribe

Oil & Gas Journal Subscribers: Have your subscription number (from the mailing label on the cover of your Oil & Gas Journal) and e-mail address ready to set up your online account through Customer Service Assistant.

If you're not an Oil & Gas Journal subscriber, start a subscription and gain access to the subscriber areas of OGJ Online now.

Stay Connected