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Free Standing Risers for Extended Ultra Deepwater Tests

[+] Author Affiliations
Roberto Rodrigues, Cesar Del Luchesse Junior, Francisco Edward Roveri

Petrobras, Rio de Janeiro, RJ, Brazil

Renato Brandão Mansano

Petrobras, Vitoria, ES, Brazil

Mauricio Barbosa

FMC, Rio de Janeiro, RJ, Brazil

Paper No. OMAE2004-51107, pp. 211-218; 8 pages
doi:10.1115/OMAE2004-51107
From:
  • ASME 2004 23rd International Conference on Offshore Mechanics and Arctic Engineering
  • 23rd International Conference on Offshore Mechanics and Arctic Engineering, Volume 1, Parts A and B
  • Vancouver, British Columbia, Canada, June 20–25, 2004
  • Conference Sponsors: Ocean, Offshore, and Arctic Engineering Division
  • ISBN: 0-7918-3743-2 | eISBN: 0-7918-3738-6
  • Copyright © 2004 by ASME

abstract

Petrobras presently has a significant part of its reserves located in deep and ultra deep waters. To produce this oil economically Petrobras created the well-known research program PROCAP 3000. This paper presents one project being developed under such program, the Extended Test for Deep and Ultra Deepwater. Petrobras has been using early production system and extended test for some years. Since 1998 Petrobras has been testing wells (extended test) with the Seillean FPSO (Floating Production Storage and Offloading). One challenge in this concept is the use of a dynamically positioned (DP) tanker with a rig and a threaded pipe (drill pipe riser) to produce and test wells in deep and ultra deep water. Another challenge is the frequency of changes of location of the FPSO, since the objective of an extended test is to produce for periods of three to twelve months. Therefore the system must have enough flexibility to make the installation and recovery easier. The proposed Itinerant Production and Evaluation Pilot System concept is easy to deploy and demobilize for extended trials. Under certain circumstances, it may even work as an Early Production System. It consists of a free-standing drill pipe riser system connected directly to the Christmas tree at the sea bed and to an air can at the top, which is located around 100 metes below sea surface. A flexible jumper links the air can to an FPSO. To improve production flow rate, an electric submersible pump (ESP) is installed at either downhole or at the top of Christmas tree. The main purpose of the extended test is to collect data, enhancing knowledge of the reservoir through more reliable information. Although attempting to minimize implementation costs, it may present a negative Net Present Value for shorter periods, especially if the value of the information obtained is not included in the calculation. Most of these ideas and concepts are still under study, and some of them will certainly be reassessed, reviewed and possibly improved. Petrobras has been working with some partner companies to develop the conceptual study and assess the system feasibility. This paper presents the main issues involved in this project. The objective of this paper is to summarize a preliminary conceptual design to conduct a feasibility analysis for Petrobras’ Free Standing Drill Pipe Riser (FSDPR).

Copyright © 2004 by ASME
Topics: Pipeline risers

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