苏里格气田苏25区块气井快速简化产能评价方法研究

苏里格气田渗透率低,非均质性明显,单井产能稳定性差,常规产能评价方法不适用,需要研究一种针对该气田储层特点的简单、快速、实用的方法评价气井产能.研究发现,关井早期20 h以内的压力恢复数据,其双对数曲线显示的井筒储集时间与井的产能存在明显的对应关系;其压力比值曲线变化趋势和数值范围也与井的产能存在明显的对应关系,由此可以大致划分气井的无阻流量范围,判断其属于几类井,确定相应的配产和开发方案.现场实际应用证实了快速简化产能评价方法的可行性和实用性,苏里格气田苏25区块采用该方法,关井时间可以由原来的200 h减少为20 h,提高了试井效率,达到快速求产的目的.

Study on fast and simplified gas well deliverability evaluation in Su25 block of Sulige Gasfield

Sulige Gasfield has distinguishing features of low permeability. significant heterogeneity and unstable single well deliverability. The conventional productivity evaluation methods are not applicable here, so a simple, fast and practical way suitable for this kind of reservoir is necessarily needed to obtain. Research results show that the wellbore storage time displayed by log-log plot of pressure recovery data has an obvious correspondence to the productivity in the early 20 hours of shut-in. It is the same with the pressure ratio curve trends and the range of values. From these findings above,the scope of AOF can be roughly classified, and the well type was then determined. Thus, the according proration and development programs can be formulated. Field practice proved the feasibility and practicality of the rapid and simple productivity evaluation method. By the use of this method, the shut-in time of Su 25 block decreased from 200 hours to 20 hours, and the goals of high testing efficiency and fast production definition were achieved.