TECHNOLOGY Snubbing workover operations in deep sour gas wells a success

Mike R. Konopczynski, Mike R. Milligan Shell Canada Ltd.Calgary Several deep, sour-gas wells underwent conversions from dual to single completions, using a snubbing unit and service rig, to improve gas deliverability. In 1994, Shell Canada Ltd. conducted workovers to commingle sour gas production from the Devonian and Mississippian formations in the Limestone field. Most of the Limestone wells are concentric dual-tubing completions with the Mississippian gas produced up the concentric annulus and the deeper Devonian gas produced up the inner tubing string. A few wells were commingled by opening sliding sleeves or perforating the inner string, but an opportunity was identified in m...

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