两亲聚合物稠油活化剂的降黏效果及驱油性能研究

Oil Displacement Performance and Viscosity-reducing Effect of Heavy Oil Activator with Amphiphilic Polymer

为有效开发黏度超过200 m Pa·s的稠油油藏,研究了两亲聚合物稠油活化剂对稠油(黏度400 m Pa·s)的降黏效果和驱油性能。结果表明,稠油活化剂溶液黏度随浓度的增加而增加,1500 mg/L活化剂溶液的黏度为39.1m Pa·s;活化剂可与沥青质发生较强的极性作用,使沥青质容易从岩石表面脱落;活化剂乳化分散原油效果较好;随活化剂加量增加,原油黏度和油水界面张力降低,活化剂与原油质量比为1∶1时可将原油黏度降至100 m Pa·s以下,活化剂质量浓度为1500 mg/L时的油水界面张力为2.6 m N/m;驱油实验结果表明,活化剂驱油的总采收率为54.45%,好于同浓度的部分水解聚丙烯酰胺(32.73%);稠油活化剂可有效封堵高渗层,改善吸水剖面,活化剂不仅可通过聚集体调整吸水剖面,而且乳化分散稠油后形成的"乳化油滴"同样具备剖面调整的能力,使岩心中的残余阻力系数由乳化前的100增至约200。

In order to effectively develop heavy oil reservoir whose formation oil viscosity exceeded 200 rnPa·s, the oil displacement performance and viscosity-reducing effect of heavy oil activator with arnphiphilic polymer were studied. The results showed that the viscosity of activator solution increased with increasing concentration, and the viscosity of activator solution with 1500 mg/L was 39.1 mPa. s. The activator had a strong polar action with asphalt, so that the asphalt could easily fall off from the rock surface. The activator had a good effect on the emulsion dispersion of crude oil. The viscosity of crude oil and oil-water interracial tension decreased with increasing activator dosage. When the mass ratio of activator and crude oil was 1 ： 1, the viscosity of crude oil fell below 100 mPa.s, and the oil-water interfacial tension was 2.6 mN/m with 1500 mg/L activator. Oil displacement experiment results showed that the recovery ratio of activator flooding was 54.45%, better than that of partially hydrolyzed polyacrylamide with same concentration （32.73%）. The activator could effectively block high permeable layer and improve water injection profile, just because of the activator aggregates and the emulsified droplets produced by heavy oil emulsifying. After emulsification, the residual resistance coefficient in rock increased from 100 to about 200.