利用油井液面恢复法确定注采关联程度及现场试验

AN OIL-WELL FLUID BUILDUP METHOD USED TO DETERMINEINJECTION-PRODUCTION CONNEXION AND ITS FIELD EXPERIMENT

对于多油层注水开发油田,定量确定注采关联程度、搞清注入水在油层中的流动方向及向某一方向的流动数量,是精细高效注水开发所必须解决的问题.目前常规方法是利用采油井和注水井平面分布位置及油层物性资料定性确定,主观因素大,常与注采关联实际不符.根据物质平衡及干扰试井原理,测试注水井工作制度改变前后平面对应油井的液面恢复曲线,计算两条恢复曲线所围成的面积(△S)及其占相应井组总面积的比例(η),其大小反应了平面对应的采油井与注水井之间有无关联及关联程度.注采井组现场试验及油井分采结果证实该方法是成功的.与注示踪剂、干扰试井等方法相比,该方法具有诸多优点,可指导油田高效注水开发.

In order to achieve refined and effective flood development of multipay field,injection production connexion and flow direction and rate of injected water in oil pay have to be determined quantitatively.A conventional method is to obtain some qualitative estimates based on areal distribution of production and injection wells and petrophysical data of reservoir,usually inconsistent with real injection production connexion due to much subjectivity.This paper,therefore,presents a new method in which two fluid buildup curves are measured in a production well respctively before and after the working system is changed in the areally corresponding injector.An area surrounded by the two curves (ΔS) and its proportion to the total area for the relative well pattern (η) are then calculated,which can indicate a connexion between areally corresponding producer and injector.This method has proved to be successful by field experiments of flooding pattern and by separate zone production.It has many advantages as compared with tracer and interference tests,and can be used to guide effective flood development of fields.