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Liner tie-backs stop casing leaks in Libya completions

01/01/2007
A project in which existing 7-in. liners were tied back to surface then cemented stopped casing leaks in the Sarir and Messla oil fields in Libya.Many wells operated by Arabian Gulf Oil Co (AGOCO) in the fields have 7-in. liner completions.Water containing H2S from the Paleocene zone between 5,500 and 6,000 ft caused corrosion that resulted in the 9 5/8-in. casing losing about 1/8-in./year in its wall thickness and eventually led to casing leaks. The water influx into the wellbore dumped water into the producing reservoir, killing it and causing H2S bacteria to spread in the sweet crude reservoir.Squeeze cementing of these leaks proved to be only a temporary or difficult solution; hence A...
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