降压增注剂界面修饰对岩心孔隙水膜厚度的影响

Effect of Interface Modification of Antihypertensive Enhancer on Water Film Thickness in Core Pore

为改善文33块沙三上油藏开发中采用酸化解堵时低无效井所占比例较高,且普遍存在措施有效期较短、注水压力较快恢复至措施前的问题,室内将低浓度(0.05%)的降压增注剂XH207B(非离子表面活性剂)注入天然岩心,研究孔隙水膜厚度和相对渗透率的变化规律,揭示降压增注剂对注入压力和渗透率变化的影响。结果表明,降压增注剂处理后,岩心水膜厚度降低,两个岩心分别下降了67.90%和38.13%;同时,降压增注剂可以降低注入压力,提高岩心渗透率,两个岩心注入压力分别降低1.2%和4.9%,岩心渗透率分别提高1.3%和4.1%,达到降压增注的效果。

In order to solve the problem of the high percentage of low-ineffective wells in the acidification development of Wen 33 block in upper sand reservoir,the short-term effective period of the measure and the rapid restoration of water injection pressure,the antihypertensive enhancer XH207B(non-ionic surfactant)with low concentration(0.05%)was injected into the natural core to study the change of water film thickness in pore and relative permeability,and reveal the effect of antihypertensive enhancer on the injection pressure and permeability.The results showed that the water film thickness of the core was reduced after the antihypertensive enhancer was applied,and that of two cores was reduced by 67.90%and 38.13%respectively.At the same time,the antihypertensive enhancer could reduce the injection pressure and increase the core permeability.The injection pressure of two cores was reduced by 1.2%and 4.9%,and the core permeability was increased by 1.3%and 4.1%,respectively,achieving the effect of lowering pressure and increasing injection.