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Rodrigano, P. R. C. da Silva, H. L. Lira, P. S. Filho: “ Planning, Executing and Analyzing the Productivity Life of the First Six Branches Multilateral Well Drilled Underbalanced in Brazil”, SPE/IADC 816120, Underbalanced Technology Conference and Exhibition held in Houston, Texas, 25-26 March 2003 IPTC 10966 20. V. Cheung, B. Ahearn, K. A. Scheidt, J. Saponja, R. Penrose, D. Christensen: “Underbalanced Horizontal Drilling in the Hussar Glauconitic ‘A’ Pool” 21. V. Suryanarayana, Bruce Smith, ABM Hasan, Charlie Leslie, Richard Buchanan, Randy Pruitt “Basis of Design for Coiled Tubing Underbalanced Through-Tubing Drilling in the Sajaa Field” IADC/SPE 87146, Drilling Conference held in Dallas, Texas, March 2004 22.

Technically, the system which will yield the best bottomhole pressure control with a continuously underbalanced condition is optimum with the required necessity of continuous real time bottomhole location and pressure measurements. This heavily favours coiled tubing (particularly for small diameter holes and reentries), but cost, availability and required horizontal reach may eliminate CT as a serious contender. Alternate parasite string or annular injection techniques may also be considered. These techniques are often costly and, from an abandonment perspective, may be more problematic for the parasite string approach.

Sotomayor, A. C. Vargas, P. R. C. da Silva, H. L. Lira, P. S. Filho: “The First Underbalanced Multilateral Well Branches Drilled in Brazil, a Field Case History”, SPE/IADC 79852, Drilling Conference held in Amsterdam, Netherlands, 19-21 February 2003 A. C. V. M. Lage, G. P. Sotomayor, A. C. Vargas, R. Rodrigano, P. R. C. da Silva, H. L. Lira, P. S. Filho: “ Planning, Executing and Analyzing the Productivity Life of the First Six Branches Multilateral Well Drilled Underbalanced in Brazil”, SPE/IADC 816120, Underbalanced Technology Conference and Exhibition held in Houston, Texas, 25-26 March 2003 IPTC 10966 20.

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