关键词: 化学驱, 驱油剂, 添加剂, 老君庙油田, 应用

Abstract: Traditionally preflush by dkdine and salty water have been used in conjunction withchemical flooding for maintaining optimum state of reservoirs with high clay and high salinities.However,all preflushes tend to prolong the time as well as to increase the expenditures.We have synthesized a high molecular weight polymer,BPA which can be introduced to thechemical flooding formulation directly. This will eliminate any preflush requirement.The nature of this technique is as follows:1.increase the negative values of Zeta potential,2.complexation of muItivalent cations,3.increase interfacial activity of surfactant.The technique is superior when compared with the traditional formulation. Field experiment at Laojunmiao indcated the following:injection pressure, lowered from 14.4%-17.8%, water imbibition,increased 270%,mobility ratio increased 190%,adsorption of surfactant greatly lowered.

Key words: chemical flooding, oil displacement agent, additive, Laojunmiao oilfield application