Abstract: In order to make up the shortcomings of available methods for calculation of reasonable spacing density, this paper develops a multi-objective optimization method based on modified B.H.IIe/IKaYeB recovery factor-well spacing density formula, integrated with economic analysisand dynamic economic analysis method and optimal control theory. This new formulae for multi-objective reasonable well spacing density isused for estimation of light and heavy oilfields or blocks for verify ing its feasibility and validity. The results are satisfactory.

Key words: well spacing density, recovery factor, economic benefit, optimization, model