减缓低渗透储层贾敏效应的方法研究

目前，低渗透油藏在各大油田分布广泛，其石油储量占未开发石油总量的比重较大。贾敏效应是导致低渗透油藏难以开采、采收率低的一个重要影响因素。采用贾敏指数来评价贾敏损害程度，制取了三种非离子表面活性剂JN-1、JN-2和JN-3，通过筛选得知JN-3降低油水界面张力的能力最强。根据贾敏效应产生的机理以及水井转抽机理，开展了减缓贾敏效应的室内试验研究，结果表明，针对性地向注入水中加入非离子表面活性剂JN-3，可以降低油水界面张力，同时适时地采用水井转抽逆向驱油来增大驱动压差，有效地抑制和减缓了贾敏效应，提高原油采收率。

Study on the Method of Reducing Jamin Effect in the Low Permeability Oil Field

Currently, low permeability reservoirs are widely distributed in major oil fields, oil in the low permeability account for a large proportion. It is vulnerable to be damaged by Jamin effect in the development, so it is difficult to extract oil in the low permeability and the recovery efficiency is low. Using Jamin index to estimate Jamin damage, then synthesize three kinds of non-ionic surfactants JN-1, JN-2 and JN-3. Through sifting, we can know that JN - 3 is the best one to reduce interfacial tension. Basic on the mechanism of Jamin and injection well converting into production well, carrying out laboratory test of redcuing Jamin effect. The results show that the interfacial tension will be reduced when adding non-ionic surfactants JN - 3 to water during the process of water flooding. At the same time, converting injection well into production well to increase the driving pressure differential in due course. This method can reduce Jamin effect effectively, so improve the recovery efficiency.