United Kingdom: Multiple-conveyance capability garners support for expandable patch ///

Small to medium-sized enterprises with lots of intellectual property now typify the sorts of companies bringing new ideas to the North Sea and elsewhere. Aberdeen-based READ Well Services is one such company, and has taken a different approach in developing its Hydraulically Expanded Tubular System (HETS), using hydraulic pressure directly inside a tubular to expand it. This process, known as autofrettage, is a relatively old and widely used industrial process (e.g., re-lining gun barrels). The company has taken this process into the downhole well environment. Due to the patented, high-pressure seal arrangement of the HETS tool, rated to take a differential pressure up to 30,000 psi, the pipe expansion process and the solutions provided are quite different from other tubing-expansion systems. The tool can expand two concentric casings simultaneously – including high-strength steels up to P110 and heavy-wall casing. The inner casing is expanded into the outer casing and then the combined casings expand to form a metal-to-metal interference fit.

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