苏里格气田苏6井区开发方案数值模拟优化研究

Numerical simulation optimization study of Su6 well block of Sulige Gasfield

苏里格气田目前探明储量已超过5 000×108m3,其储层非均质性强,砂体叠置模式复杂。在开发早期,井网密度小,控制程度低,使用传统气藏描述方法不能满足开发设计的需要。利用随机模拟技术建立的精细地质模型开展了数值模拟研究,对气田的开发方案进行全面优化,制定了苏里格气田开发技术策略,以最大限度地提高气田开发经济效益。通过方案对比,确定苏里格气田开发井网为在有效砂体相对发育区的均匀井网,苏6井区应采用一套开发层系、一套井网的衰竭式开采方式,行距与排距分别为700和1 000m。预计年产天然气5×108m3,须钻新井73口,可稳产4 a。

The existing proved reserves in Sulige Gasfield is more than 5 000 ?108m3. The reservoir in the field was featured with strong heterogeneity and complex sandbody superimposed model. The traditional method of gas reservoir description can't meet the needs of development design since insufficient well density and low control degree at the early stage of gasfield development. The precise geologic model established by stochastic modeling technology was used to numerical simulation research. Gasfield development plan was optimized overall, and development technology strategy of the Sulige Gasfield was worked out so as to enhance the economic benefit in the development of the gas field to maximum limit. The well-pattern determined after plan contrast should be even pattern in the relatively developed region of effective sandbody. The Su6 well block should be developed in natural depletion with one set of development layer series and one set of well pattern, the well row spacing and line spacing were 700 and 1 000m respectively. Seventy three new wells will be need for 4 years of stable production with 5 x 10 m gas production one year.