一种提高采收率的新技术在老油区的应用研究

为了弥补注水开发油田在提高原油采收率方面的不足,试验了一种新技术—“2+3”提高采收率技术,该技术是在对注水井进行充分调剖,增加注入水驱替体积的基础上,注入有洗油效率的驱油剂,进行有限度的三次采油,进而提高注入水洗油效率。该技术在桩106老区桩106-32井组进行的现场试验,试验过程中,相应研究应用了FD判别调剖充满度技术,以铬冻胶、固化体系为主的深部调剖剂调剖技术,并模拟试验区油藏情况,通过岩心驱油试验,筛选了以聚合物、碱为主的驱油剂。试验使井组水驱开发状况明显改善,增产效果显著。在不考虑递减的情况下,井组平均日增原油14.3 t,累计增产原油4 830 t,投入产出比1∶6.4。

APPLICATION OF A NEW EOR METHOD TO THE HIGH WATER CUT RESERVOIR

This paper presented the results from pilot test of a new “2+3”EOR technology at Zhuang 106-32 well group in Zhuang l06 oil district. The new“2+3”technology is used to enhance the oil recovery by improving not only the sweep efficiency but also the displacement efficiency, which is referred to as limited tertiary recovery. This technology primarily increases injection water volume while mixing oil-washing agent into the injected water. Compared with the traditional water-flooding, the volume of the new displacing agent is so small. TheFDva1ue is also used to identify the degree of profile control. The profile control agent is a mixture of chromium gel and solidifiable system, and the displacing agent includes alkaline and polymer. After the pilot test finished, the performance of the well group is remarkably improved and the oil rate is increased by 14.3 t/d. So far, the incremental oil volume is up to 4830t regardless of the nature decline of production and the ratio of investment to outcome is 1∶6.4.