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First in Russia
In autumn 2013, Weatherford ZoneSelect™ frac and completion system with Monobore sliding sleeves was first applied in Russia as part of a pilot operation at a large field in Western Siberia.
The main feature of this unique for our country project was application of proved and reliable ZoneSelect frac and completion system equipped with Monobore sliding sleeves switched by HWB tool run on coiled tubing (CT). Well completion with such an equipped system may become an economically and technically justified alternative to sliding sleeves activated by variable diameter balls, as ports and balls shall be milled after a multifrac job.
Using ZoneSelect technology with circulation valves with full-bore internal diameter helps prevent composite particles of frac sleeves and bakelite balls from getting into the wellbore and causing difficulties while well completion and operation. Besides, circulation valves provide more opportunities for selective frac. For example, in future the technique allows isolation of watered intervals while production in one trip with coil tubing and closing a corresponding port. Apart from that, circulation valves enable repeated tracking of any of previously treated intervals.
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Full version of the article can be downloaded here.
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