Sabriya 72 (SA-72) is a deep vertical high pressure well originally drilled in North Kuwait in 1983 which was temporarily abandoned due to stuck pipe. The last intermediate casing was set prematurely above the base of a critical highly pressured salt section. Due to the importance of the SA-72 location to appraise a newly discovered field, economics favored re-entering this well in 2003 and sidetracking directionally to intersect suspected fractures in the Jurassic Marrat carbonate formation.

The main challenges of this well were to sidetrack to the target depth without compromising well integrity, and to test the well with the largest production liner possible.

In order to meet these challenges, several first time technologies to Kuwait Oil Company were planned and utilized in this well. These new technologies included running a 6" x 7 ¾" expandable liner, as well as utilizing Near Bit Reamers (NBR), bi-center bits, and slim hole sidetrack techniques to prepare the hole for the expandable liner and to drill to total depth afterwards. An unprogrammed 6" x 7 ¾" expandable patch was also installed in the 7 ¾" production casing to repair a severely damaged area.

Due to unforeseen complications, this is also the first time that the expandable technologies have been used in a 19.7 ppg mud weight. Although the expandable tubulars were run successfully, severe lost circulation after drilling below the expandable changed the course of action and thus the final completion of the well.

This paper will be a case study that discusses the planning, implementation, and lessons learned from the utilization of expandable technology on SA-72.

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