Uso de rejillas expandibles para prolongar la vida de una bomba electrosumergible en campos maduros

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14216 The Use of Expandable Sand Screen to Prolong ESP Runlife in a Mature Field with Severe Sand Production Problems
Fausto Caretta, Repsol YPF Maxus SES; Rafliansyah A. Putra, Repsol YPF Maxus SES; Franck Lavie, Weatherford Completion Systems; A. N. Martin, BJ Services

Copyright 2002, Offshore Technology Conference This paper was prepared for presentation at the 2002 Offshore TechnologyConference held in Houston, Texas U.S.A., 6 –9 May 2002. This paper was selected for presentation by the OTC Program Committee following review of information contained in an abstract submitted by the author(s). Contents of the paper, as presented, have not been reviewed by the Offshore Technology Conference and are subject to correction by th e author(s). The material, as presented, does notnecessarily reflect any position of the Offshore Technology Conference or its officers. Electronic reproduction, distribution, or storage of any part of this paper for commercial purposes without the written consent of the Offshore Technology Conference is prohibited. Permission to reproduce in print is restricted to an abstract of not more than 300 words; illustrations may not be copied. The abstractmust contain conspicuous acknowledgment of where and by w hom the paper was presented.

perforation tunnel collapse / plugging, after the ESS installation. By installing this sand control solution, it is anticipated that ESP runlifes will be prolonged and therefore considerably improving operating field costs. Field and Reservoir Characteris tics The Cinta field is located 80 km North, offshoreSoutheast Sumatra and falls within the hydrocarbon provinces of the Northwest Java and Sunda basins. It derives its production primarily from the Late Oligocene-early Miocene Talang Akar clastic. Talang Akar Zone 1 consists of point bar channel sands, which are laterally confined and commonly separated vertically and laterally by shales. This results in poor communication between both the underlyingZone 2 sands and within individual Zone 1 channel sands. Talang Akar Zones 2, 3, and 4 are comprised of thick, multiple stacks of fluvial deposits, which lack continuous shale barriers, although depositional heterogeneity results in a broad range of porosities and permeabilities with small, isolated shale barriers distributed randomly throughout the reservoir. All four zones are unconsolidatedwith minimal consolidation being observed in the upper sands, increasing gradually to the lowest. The field was discovered in 1970. More than 120 deviated wells have been drilled, with only half of these producing today. The average reservoir depth is approximately 3,400’ SSTVD. With over 30 years of continuous exploitation the reservoir pressure has depleted from 1488 psi to about 710 psi nowadays.The average porosity is in the range of 25 to 28% with permeabilities differing from 500 to 2000 mD. The primary drive mechanism is moderate water drive combined with solution gas drive. Sand Production Problems Due to formation pore pressure decline, leading to unconsolidation, formation solids production has increased. This accentuated with higher water cut has led to increased operating andmaintenance expenditure. All of the wells are drained utilising ESP’s. Solids production leads to the following operational issues:

Abstract In Repsol YPF Maxus SES, South Business Unit (SBU), hydrocarbon recovery is mainly from two reservoirs. One of which is the Talang Akar Formation (TAF), a typical sand stone. Since production started in the late 70's, these reservoirs have depletedconsiderably. From experience, these sand stones produce sand because of unconsolidation, which becomes more critical with the onset of declining reservoir pressure. The entire field is drained utilising Electro Submersible Pump (ESP). Sand production compromises production, through failures of this artificial lift system. The conventional way to reduce or eliminate this problem is by installing a sand...
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