Abstract: Based on analyses of factors affecting controllable reserves of single well, this paper presented a formula for calculating recoverable reserves of single well at economic limit combining with economic index . This formula was applied in six heavy and light oil infill adjustment blocks in Xinjiang oilfield, and sensitivity analyses of average well depth and operation cost to recoverable reserves of single well at economic limit were made.

Key words: Xinjiang, Oilfield, Adjystment, Economy, Recoverable reserve