Abstract: Water-drive type curves are the popular technique in petroleum engineering. Combining the water-drive type curves with well spacing density formula, this paper offers the correlation expression between well spacing density and recovery factor of oilfield by comparison of different stages and regulation effects along with regress calculation of relevant parameters. Using the given ideal recovery factor, the corresponding reasonable well spacing density can be calculated. The case study indicates that this method is reliable and the results are satisfactory.

Key words: oilfield development, water drive, type curve, well spacing density, method, technique