Challenge

The purpose of the installation was to prove the ability to expand the 11-3/4 in. 47 lb/ft liner with a 12-1/4 in. SameDrift expansion assembly and anchor the Openhole Clad (OHC) to the formation to allow drilling to continue with a 12-1/4 in. bit and BHA with no loss of diameter. The installation would provide the 12-1/4 in. pass through below the 13-3/8 in. casing.

Operation

251 feet of SameDrift OHC was set in the 12-1/4 in. section that had been under-reamed to 13-1/4 in. The SameDrift OHC was installed 105 ft below the 13-3/8 in. shoe. Following the successful expansion of the OHC system, the shoe was milled out and the 12-1/4 in. section was completed by drilling a further 2,113 ft of formation.

An extensive formation-sampling program was then undertaken with two wireline logging runs and three conditioning BHA’s run through the OHC without any issues.

The 9-5/8 in. liner was subsequently run without any issues and cemented back into the 13-3/8 in. casing.

Added Value

The successful installation and expansion of this 12-1/4 in. OHC has proven the SameDrift expansion assembly to create an expansion cone capable of expanding the liner and providing the same drift diameter as the base casing.

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