USIT-CBL CombinationImproving your efficiencyOmar Lopez ArceGeneral Field EngineerSchlumberger- the Wireline

Schlumberger Private

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26/11/2009

Schlumberger Private

USIT-CBL – Identify microannulus

See this real example where:USIT-CBL was run in 7 in casing, common cement G type.Fresh water as borehole fluid (8.4 ppg)Two passes were performed (0 and 1000 psi)Extra pass represented 1.5 hr more operating timeInterval from 10250 to 10300 ft shows a microannulus

USIT-CBL COMBINATION DOES NOT NEED PRESSURE IN CASING!

36/11/2009

Schlumberger Private

USIT-CBL – Identify microannulusUSIT-CBL real example. Two passes (0 and 1000 psi)

CBL 0 psi (see bond index curve)

CBL high reading + USIT good bond

= microannulus

CBL 1000 psi (bond index reduced)

Microannulus checked

USIT Remains the SAME

Schlumberger Private

USIT-CBL – Identify microannulus

An extra pressure pass meansPressure test to wireline equipment and rig equipmentUnnecessary pressure exerted to casing (this can be avoided)Extra pass – extra time (going down, log up, etc)

AN EXTRA PASS MEANS MONEY $$$

56/11/2009

Schlumberger Private

USIT-CBL – Identify microannulus

USIT-CBL (0 psi)Black curve on track one is CBL amplitude coming from sonic tool. Black curve on cement (USIT) map is the bond index curve coming from sonic tool as well.IF CBL SHOWS BAD CEMENT AND USIT SHOWS GOOD BOND THIS MEANS MICROANNULUS!

66/11/2009