This paper was prepared for presentation at tha 1998 lAOC/SPEAsfa Pacific Drilling Ctierence hew in Jakarta, Indonesia, 7-9 September 1998. This paper was selected for presentation by an lADC/SPE Pregram Committee following review of inforrnatiin mntalnad in an abstra~submitted by the author(s). Contents of tha paw, as prasentad, have not baen reviewed by the International Association of Drilling Contractors or the Society ef Petrolaum Engineers and are subjed to cerretion by tha atis). The matefial, ae prasentad, does not n=asarik refl~any position ef the IADC w SPE, their offiwra, m membare. Papers prssentad at tha fADC/SPE meetings are subjed to publication reviaw by Edtorial Committees ef the IADC and SPE. Electronic rapraduction, distributii, or storage ef any part of this paper for cammarctal purposas without tha written cansent of the Seciety of Patroleum Engineers ia prohibfiad. Permission to reprcduce in print ia resMed to an abstract ef not more than 300 words illustrations may not M mpied. The abstract must mntain mnspicuous acknowledgment & where and by whom the paper was sented. Write Lihrian, SPE, PO. Box 833838, Riiardacm, TX 7S083-38=, USA, fas 01-972-952-9435. AbstractThis paper describes the project and execution of a well using Underbalance Drilling (UBD) technique in South Brazil. Due to very hard formation in the intermediary section of the well and a very damage-sensitive reservoir, the use of UBD was considered mandatory for this field. New equipment were specially designed for use in the well including a liquid-gas separator and a new manifold. Since nitrogenated fluid WE used as drilling fluid, a membrane was used to on-site generation of nitrogen. The article gives field data obtained in the well and also shows comparison b~een the results obtained with UBD and conventional drilling. A description of the advantages, problems and shortcomings of the technique also is included in the paper.
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