长庆油田致密气藏气井动态储量计算方法研究

长庆气区气井普遍面临储层低渗致密、压力测试数据缺乏、生产制度不稳定、井数多等难题,传统评价方法难以及时准确评价气井动态储量。针对长庆气区渗流及生产特征,提出了一种便于现场应用的产量不稳定分析方法,结果表明,引入叠加时间函数的致密气井动态储量评价方法,计算结果较为准确,可有效处理变产量,且不依赖于传统图版拟合,同时计算相对简单,方便现场应用,为快速、准确评价长庆气区致密气井动态储量提供了技术支持。

Calculation methods of dynamic reserves of tight gas wells in Changqing oilfield

Gas wells of Changqing oilfield were generally characterized by low permeability reservoirs,lack of pressure test data,unsteady working schedule and large amount of gas wells,the traditional appraising method was difficult to accurately evaluate dynamic reserves of gas wells in time.By considering characteristics of production and fluid mechanics in Changqing gas field,apractical dynamic reserves appraising method,which was based on superposition theory,was proposed.With merits of introducing superposition time into dynamic reserves equation of tight gas,this simplified method was useful to deal with variable rate without relying on typical curve fitting.Besides,the result of this method was correct and unique.Furthermore,a technical support was provided to realize quick estimation of dynamic reserves in Changqing gas field.