At the end of the set, what was the score? “Federer” was rolling toward the finish line, 7 6,7 6, to be continued. It considered safe to handle and store because it requires a substantial amount of electrical energy for ignition.The Interwell technology was targeted at Norway offshore oil and gas industry but Skjold said Alberta inventory of nearly half a million wells, compared with Norway cumulative total of about 5,000 wells, convinced the company to focus on Canada instead.The leaking well problem is also better known in Alberta than in Norway because it is more visible, he said, pointing out it hard to tell whether wells hundreds of metres deep in the cold and stormy North Sea might be leaking small amounts of natural gas. For producers Shell Canada, Imperial Oil and Canlin Energy in the past 18 months and plans to test eight to 10 more this year. Skjold said the testing has been successful so far, but the next tests will be performed on wells, where standard plugs have failed.Most wells in Alberta that no longer produce profitable volumes are plugged with a cast iron and rubber plug inside the steel casing and sealed by pouring cement on top, said Will Butler, lead, regulatory efficiency, for the Alberta Energy Regulator oil and gas operations group.If a leak develops outside the casing, the standard fix is called and squeeze, where the casing is perforated from within and cement squeezed through the holes to make a better seal with the surrounding rock.He said perf and squeeze is successful on the first attempt about half of the time, but often needs to be repeated, which adds to the cost.Skjold said the Interwell technology is probably too expensive to compete on simple well plugs, but can likely be cost competitive with perf and squeeze and similar methods.The problem with cement is that it tends to shrink and pull away from the metal casing over time wells that are sealed today may still leak in the future, said Dale Kunz, president of Winterhawk Well Abandonment Ltd.The private Calgary company is developing a tool that can be lowered into a well and then expanded with enough force to make the steel casing bulge outwards to create a tighter seal with the surrounding rock.He said natural gas can leak from oil wells, too, because producers often drill through gas bearing rock to reach deeper oil bearing formations.
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