This paper chronicles the surface and field trials of a liner drilling system in which a liner is releasably attached to a drill string used to both convey the liner and bottom hole assembly into the well bore and apply drilling force to the bottom hole assembly. The purposes behind the development of this system are the mechanical strengthening of the wellbore provided by rotating a casing string against the open hole while circulating cuttings up the annulus during the drilling process, and to drill and case the hole the same operation, both protecting the hole as it is being drilled and allowing a passageway back to surface for the BHA if hole issues are encountered.

Both 7" × 9-5/8" and 9-5/8" × 13-3/8" liner drilling systems have been designed, built and drill tested to provide the above advantages. The purpose of this paper is to highlight the reasoning behind the development of the systems and the testing of the 9 5/8" liner drilling system. This particular liner drilling system was drill tested twice in Cameron, Texas. The first drilling test demonstrated the liner was set and reset successfully through three separate cycles over separate intervals. The second test was an attempt to reproduce the success of the first test over longer intervals deeper in the wellbore. In this test the liner hanger set only one out of three attempts, leading to the conclusion that a minor design change was required to increase the system's resistance to cuttings ingress into the interface of the hanger and setting tool.

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