Abstract:

The oil content is one of the primary specifications of water quality control in produced water re-injection and conventional oilfield water treatments. It also mainly contributes to the decline of water receptivity of the injected formation especially in water re-injection system. It is very difficult that how to determine reasonable oil content corresponding to specified formation whenever constituting water quality standard in water flooding oilfield. In this paper,the damage characteristics of emulsified oil droplets on core flowing efficiency were effectively assessed in the first time by involving orthogonal experiment design method, and lots of useful conclusions were also obtained. It has important guidable significance in understanding reasonable water quality standard and coming up with good ideas to cease this kind of formation damage in oilfield.

Key words: water flooding, injection water quality, formation damage, emulsified oil, water quality criter