油田现行的产量递减率计算方法及分析

Calculation Method and Analysis of Oil Production Decline Rate Used in Oil Field

各种方法计算的递减率值，虽然都能从不同侧面反映产量的递减，但含义有所不同，不能当作相同指标来引用和对比。根据递减理论，进一步深化了对不同递减率表达式基本含义的认识，研究了不同递减规律下递减率计算方法之间的联系与区别，推导出了年产量递减率、年产能递减率、月递减率三者之间的相互关系。根据上述关系式及其递减规律，能够快速而简捷地进行递减率指标预测，从而确定年度分月产量运行安排或开发生产规划安排，能有效地指导油田开发生产管理。

In conducting performance analysis, prorating production, injection and working put development plan, decline rate is often used to analyze the change of oil production and forecast the future tendency of oil area, oilfield, unit, as well as well group and single well. Therefor the concept of decline rate is very important. There are rules made by CNPC as to the calculation method of decline rate, but actually different methods are applied to different oil fields. These decline rates calculated by different methods reflect the actual production decline of each oil field and are of different implications. If they are quoted and compared as a same index, there must be some problems. Based on decline theory, this paper further deepens the knowledge of the expressions of different decline rates is further deepened, the relationship and differences among different calculation methods at different decline rules and finally derives some relations among annual oil production decline rate, annual productivity decline rate and monthly decline rate are studied. With these relations and their decline regulation, decline rate could be forecasted rapidly and easily so as to confirm the arrangement of monthly production of each year and development program, guide the management of oil field development and production. 