and economical evaluation, a new method for calculating reasonable and ultimate well spacing density in an old oilfield of Yumen that has been developed for many years.

• 以玉门油田分公司一老油田为例,在总结前人研究的基础上,用解析方法和经济评价方法推导出一种计算投入开发若干年后的油田(藏)理井网密度和极限井网密度的方法。