Well spacing density is a very important index in oilfield development planning and well spacing designing.

井网密度是油田开发规划与井网设计中的一个重要的指标.

Economical well spacing and technical limit well spacing must be considered when making up development plan for low permeability sandstone reservoir.

低渗油田开发方案设计必须同时考虑经济合理井距和技术极限井距。

This paper uses net present value to improve the method for calculating economy rational well spacing density of matured oilfield considering every factor affecting the well spacing density.

通过综合考虑影响经济合理井网密度的各种因素，运用净现值等方法，对计算老油田经济合理井网密度以及经济极限井网密度的方法做了改进。

Reasonable developing well spacing for condensate gas reservoir is usually determined by empirical value.

凝析气藏合理开发井距确定一般用经验值给定。

Correlation of the produced fluid profiles before and after shows that there were more high water cut layers and much influence by well spacing after infilling.

产液剖面对比看出，加密后高含水层所占比例较大，且受井距影响较大。

The later includes well spacing, injection mode (gas injection or gas alternating water injection), solvent cumulative injection amount and the alternating frequency, etc.

工程因素包括井距、注入方式（注气或气水交替）、溶剂注入量、气水交替频率、射孔位置等。