For the past several years P.T. STANVAC INDONESIA has been actively engaged in an infill drilling program in its old fields onshore Sumatra. The primary purpose of this program is to identify and recover remaining accumulations of oil which can not or will not be drained by existing wells.

This paper reviews the results of such infill drilling in Stanvac Is Raja and Abab fields in South Sumatra. The program has already provided a sizeable increase in oil production and reserves in both fields while extending the productive limits well beyond what had been considered to be the field limit.

The program has shown that original field development drilling on 80-acre spacing did not define all of the hydrocarbon bearing zones nor establish ail of the drainage points required to efficiently recover the moveable hydrocarbons in the stratigraphically complex Talang Akar formation. Improved economics resulting from higher energy prices has provided the incentive required to pursue the development of these incremental reserves.

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