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Coiled tubing is often used to carry out operations similar to wirelining. The main benefits over wireline are the ability to pump chemicals through the coil and the ability to push it into the hole rather than relying on gravity.
Coil tubing also transports acids and reactive chemicals down the wellbore and tubing corrosion is a concern. Low density, high-pressure gaseous nitrogen is ideal for these applications. ... High-pressure nitrogen can displace drilling fluids, reduce hydrostatic heads, and allow the well to resume production.A colorless, odorless gas, Nitrogen is a non-hydrocarbon inert gas used for a variety of functions in the drilling, workover and completion phases of oil and gas wells, as well as in pigging and purging pipelines. ... Nitrogen is produced through patented membrane filters.