多注入轮次提高等流度二元驱采收率的实验研究

闫文华 张朝良 付强 等

摘 要：针对J16块试验区实施二元驱时，存在注入液在不同渗透性地层中推进速度不均匀、驱油效果变差等问题，开展了多注入轮次提高等流度二元驱采收率的室内实验研究。结果表明：在二元体系的成分和用量相同的条件下，不同注入轮次等流度二元驱采收率不同。实验条件下，四轮次注入时化学驱采出程度最高，达到35.2%，高出一轮次7.49%。多轮次注入二元体系较单轮次注入能够更好的控制含水上升速度，长时间维持较高注入压力，更大限度增强等流度驱油效果。

关 键 词：二元驱；渗透性；注入轮次；等流度；采出程度

中图分类号：TE 357 文献标识码： A 文章编号： 1671-0460（2016）03-0449-04

Experimental Study on Increasing Injecting Times to Enhance

Oil Recovery of Equi-mobility Binary System Flooding

YAN Wen-hua1，ZHANG Chao-liang1，FU Qiang2，ZHENG Xiao-song3

（1. Northeast Petroleum University， Heilongjiang Daqing 163318，China；

2. Nanhai West Oil Research Institute， Nanhai West Oil Petroleum Administration， Guangdong Zhanjiang 524057，China；

3. Liaohe Oilfield Company Jinzhou Oil Production Factory， Liaoning Panjin 124010，China）

Abstract： When J16 test block applied binary compound flooding， there was the phenomenon that the injected liquids propelling rate in the different permeability stratum was asymmetrical and oil displacement efficiency became worse. In order to solve this problem， the experimental study on increasing injecting times to enhance oil recovery of equi-mobility binary system flooding was carried out. The results show that different injection times of equi-mobility binary compound flooding have different recovery under the same condition. Under laboratory conditions， four injection times get the highest chemical flooding recovery of 35.2%， 7.49% larger than one round injection. Compared with single injection， multiple injections can better control water cut increasing rate， maintain high injection pressure for longer time and enhance equi-mobility binary compound flooding effect as far as possible.

Key words： Compound flooding； Permeability； Injecting times； Equi-mobility； Recovery percent

J16块试验区实施二元驱以来总体表现出产油量上升，综合含水下降的化学驱见效特征。而因为油藏具有非均质的特点，难免会发生二元体系优先进入高渗透层的现象，这会降低二元液波及系数，使二元驱的驱油效果变差[1]。应用多段塞注入方式虽然可以适当缓解层间矛盾[2，3]，但对于提高二元驱驱油效果并不理想。在多段塞等流度二元驱基础上[4]，利用注入液本身的性质，通过调整注入参数，达到在二元体系用量不变的情况下，进一步提高二元驱在非均质地层中驱油效率的目的，充分发挥出二元驱提高采收率的潜力[5-7]。本文针对J16块实施二元驱过程中，二元体系驱油效果变差的问题，开展多轮次等流度驱油方法的实验研究，分析多轮次注入提高等流度二元驱采……