Gas wells in X-Field Malaysia often produce sour gas (H 2 S) along with significant quantities of CO 2 . When it is suspected that these conditions will be encountered, corrosion-resistant alloys (CRAs) must be used in completions. This paper discusses an unique development strategy for an offshore gas cluster off Peninsular Malaysia. The planning for the project had to consider that the environment contained approximately 57% mol CO 2 in addition to maximum H 2 S content of up to 11 ppm. To meet the needs of this project, a dedicated team from the operator and service/engineering company developed a completion strategy incorporating several firsts for this area. This paper will discuss the unique completion strategies selected, the reasons they were used, and the resulting success of the well completions. This was the first use of 25Cr completion equipment and 22Cr tubing by this operator in Malaysia. Some of the changes included the following: Alloy 25Cr was used for all 3½-in. and 4½-in. completion equipment.  22Cr tubing for 3½-in. and 4½-in. completions was used.  The equipment was rated for 5,000 psi and 7,500 psi.The wells were completed without any issues relating to the use of new strategies; these strategies have become the standard reference for all future monobore/dual completion wells with high CO 2 content and low H 2 S content for both upper and lower completions. The wells have been in operation for more than one year, and production has been as anticipated.This case history covers the early stage planning (including the materials recommendation stage), technical design review, equipment design, CRA handling and equipment preparation onshore, CRA handling offshore, completion execution throughout the campaign, and lessons learned from the campaign. Results of the operation from a mechanical perspective will also be presented.