In 1981, ARCO executed the first offshore development contract ever between China and a Western oil company. In 1983, ARCO discovered the Yacheng 13-1 gas reservoir during exploration drilling in the South China Sea. Following several years of delineation drilling, reservoir evaluation, and commercial negotiations, a full field development program was initiated in 1992 to produce the field's estimated 3 TCF of gas reserves. This paper describes design processes, special engineering tasks, procurement decision making, and field procedures which were implemented to optimize cost and performance of oil country tubular goods (OCTG) for the development drilling program. Structural drive pipe casings were designed in an integrated manner with the drilling platforms. Conductor, surface and intermediate/production casings were optimized by identifying constraining loads and selecting specialized OCTG products to improve tubular design efficiency for those loads. Production liners and tubings were designed to provide metallurgical corrosion protection, standardized well programs, completion flexibility, and minimum cost. To further optimize liners and tubings, empirical collapse ratings were derived from a focused testing program. Connection qualification testing was conducted to maximize confidence in the premium connections and field running procedures. These engineering efforts resulted in significant reductions in tangible drilling costs and substantial increases in the field reliability of the OCTG.

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