Schlumberger

Technical Paper: Benefits from Installing the Advanced Gas Handler in Conjunction with ESPs in Maxus SES Fields

Society: SPE
Paper Number: 20021024
Presentation Date: 2007
 Download: Benefits from Installing The 'Advanced Gas Handler'* in Conjunction with ESPs in Maxus SES Fields (1.13 MB PDF) Login | Register

 

Abstract

Repsol YPF Maxus' Southeast Sumatra (SES) Production Sharing Contract (PSC) has an installed base of approximately 475 oil producing wells equipped with Electric Submergible Pumps (ESPs) in offshore Southeast Sumatra, Indonesia. Several producing fields in the Central Business Unit (CBU) are completed in the Zelda sandstones and are characterized by short ESP run times due to a combination of high bottom hole temperatures, scale deposition, presence of abrasives, and relatively high producing GOR's. Approximately 40% of the total operating budget (representing the single largest component of the operating budget) for these fields is spent on repairing failed ESP's, thus Maxus spends a considerable amount of effort searching for alternative completions in anticipation of increasing run times of the installed ESPs.

This paper will present the field trials and results of running REDA's 'Advanced Gas Handler'* (the 'handler') in several wells (in the Atti Field) within the CBU, as one such successful and beneficial 'alternative' completion.

Development of new reserves in the CBU has typically resulted in drilling wells which are deeper and with higher bottom hole temperatures. The most recent field to be developed is the Atti field, which has experienced several premature ESP failures. Atti wells are completed with 7 inches casing, produced with high GOR's and have a static reservoir temperature of 265oF. Initial ESPs assemblies were sumped below the perforations to avoid free gas passing through the pump, thus requiring motor shrouds to cool the motors. The most common failures of these assemblies have been motor failures related to the reduced flow caused by scale formation between the motor and shroud. From the analysis of these failures, YPF Maxus and Schlumberger-REDA modified the completion configuration in these wells to avoid the use of the motor shroud, resulting in both increases in production volumes and/or ESPs run-times. Potential annual operating cost savings of $1.0MM could be realized in the Atti field alone, without mentioning potential benefits from increased oil production. The principal modification contributing to these benefits has been the inclusion of the handler. Due to the results from the Atti wells, several other wells in the CBU have now incorporated the handler in their assembly.

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