The expansion of concentric downhole tubulars with direct hydraulic pressure has been advanced by READ Well Services with the Hydraulically Expandable Tubular System (HETS). Figure 1. The HETS expansion tool can retain pressures up to 30,000 psi between its two dynamic seal elements. (All figures courtesy of READ ASA) Developing a completely new liner hanger design in just 14 months would be a challenge in its own right, but this project delivered a hanger-packer assembly that would prove able to withstand the rigors of 20 days in a...

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