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目前各油田的递减率计算方法各不相同,相互之间容易混淆,计算结果无法统一对比衡量,而且鲜有针对气藏产量递减率计算方法的研究。总结归纳了现场应用最广泛的三类气藏产量递减率:年产能递减率、年产量递减率和年对年产量递减率,深入分析它们的含义、区别以及联系,并以Arps递减理论中的双曲递减、指数递减、调和递减和衰竭递减模型为基础,推导了三类产量递减率的数值关系,发现不管哪种递减模型,年产能递减率至少是年产量递减率的1.8倍;在实际生产中,可以求得一个递减率值,再利用换算关系式快速求取另外两个递减率值。以苏里格致密气藏苏5区块某集气站为研究对象,将这三类递减率及其数值关系应用于实际生产数据分析,计算结果证明了递减率之间数值关系的可靠性,进一步分析各产量递减率的实际意义,可以为气田的产量预测和生产管理提供指导。
At present, the calculation methods for the decrement rates of different oil fields are different and easily confused with each other. Therefore, the calculation results can not be uniformly compared and measured, and few studies have been made on the calculation methods for the yield decline rate of gas reservoirs. This paper summarizes the yield decline rates of three types of gas reservoirs with the most widely used in the field: annual rate of decline, annual rate of decline and year-on-year rate of decline, further analysis of their meanings, differences and connections, Based on the deduction of hyperbolic declines, exponential decay, harmonic diminution and depletion diminishing models, the numerical relationship between the three types of yield decay rates was deduced. It was found that the declining rate of annual productivity was at least 1.8 times of the annual declining rate regardless of the declining model. Production, you can find a decline rate value, and then use the conversion formula quickly get the other two rates of decline. Taking the gas gathering station of Block Su 5 in the tight gas reservoir of Sulige as the research object, the three types of decreasing rate and its numerical relationship are applied to the actual production data analysis. The calculation results prove the reliability of the numerical relationship between the decreasing rates. Further analysis of the practical significance of the rate of decline in production can provide guidance for gas field production forecasting and production management.