This paper was selected f a presentation by h e OTC Pmgram Canmittee following review of M a a t i o n contained in an abstrecl submitted by the autws). Contents of t k a peper, as pmwnbd, have rot been reviewed by the Offshore Technolo~y Confersnce and are W e c t to carsdim by the autha(s). Tha material, as presented, does rot w l y rdlect m y poWn of Vw, Offstmre Technology Conference a it8 offken. E m mpmdwkm, w o n , or storage of any pad of this paper f a commercial prrporee wi(hout the written camant of the Offshore Technology Conference is prohibited. Pflission to mpmdse in pht is nrtricted to m abstracl of n d more than 300 wads: i l l -may rpt be cqbd. ubtrac! must contain conspicuous acknowledgmeri4 of where and by whan the peper W a pmemted.New well design and drilling follow-up methodology, based on a modified kick tolerance margin, was developed and successfully applied to the execution of six deep water and five high temperature, high pressure (HTHF' ) exploratory wells. This approach considers the whole scenario in a more realistic way, assuring safe and cost-effective operations. This work makes a review of current methods, introduces the new one and presents three case histories, two in deep water and one in a HTHP environment.In the first case, well PAS-25 at a water depth of 1214m, the application of the new methodology made possible to eliminate an entire casing string, bringing about considerable cost reduction. In the second case, well CES-Ill, it was observed that fiiction pressure loss through the choke line (FPLCL) was very restrictive, requiring special attention during kick tolerance calculations. Finally, the proposed casing setting depth design and follow-up methodology was applied to plan BSS-78, a HTHP exploratory well of Santos Basin, southeast coast area of Brazil. This plan was based on data from a problematic reference well, BSS-70. The obtained results show significant economic advantages.As a result, the experience fiom these field applications indicates that: (1) the determination of reliable pore pressure and fiacture gradient curves is critical for planning and execution purposes; (2) specific drilling and well control procedures have to be defined, based on how critical is the well under consideration; and (3) rigorous training program is necessary for the whole team.
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