摘要
针对Oriente油田高温、高盐的实际条件，首先对选定的3种聚合物驱油剂进行黏浓、黏温及稳定性性能评价。研究表明：3种聚合物驱油剂的黏度随聚合物浓度的增大而增大，APP5驱油剂增黏幅度明显大于另外两类聚合物驱油剂，且聚合物APP5驱油剂在浓度为2500 mg/L时，可以满足该油层理论要求的黏度值。但是，由于油层高温（95℃）下，单一聚合物APP5驱油剂不能持续维持理论需求黏度值。在单一聚合物驱油剂中按聚合物、Cr3+质量比60:1加入质量分数为2.7%的醋酸铬，同时加入200 mg/L缓凝剂（主要成分为羟基羧酸盐—酒石酸钠），进行交联。结果表明：凝胶在60 d后，黏度均趋于平稳，且聚合物、Cr3+质量比60:1的Cr3+/APP5凝胶能满足油层理论黏度值。通过室内物理模拟实验结果表明：在油田平均含水率达到90%时，转注0.6 PV Cr3+/APP5凝胶驱油剂，油田经济效益达到最佳状态。
Abstract
In view of the actual conditions of high temperature, high salinity in Orienteoil field, the viscosity- concentration relationship, viscosity-temperature relationship and stabilization of three kinds of polymer oil-displacing agents was investigated. It could be concluded that, with the increase of the concentration of the three kinds of polymer oil-displacing agents, the viscosity increased as well. Obviously, the tackification range of APP5 oil-displacing agent was greater than that of the other two kinds of polymer oil-displacing agents, and when the concentration of the APP5 was 2500 mg/L, the requirements of the theory viscosity value of the reservoir could be met. However, due to the specific conditions of the reservoir with high temperature (95℃), the single polymer APP5 could not continue to maintain theory viscosity value. Secondly, chromium acetate (the mass fraction is 2.7%) and 200 mg/L retarder (the main ingredient is hydroxy carboxylic acid salt—sodium tartrate) were added in the single polymer solution at polymer to “Cr3+” mass ratio of 60:1, the crosslinking reaction took place. The results showed that the viscosity of the three gels tended to stabilize after 60 days, and Cr3+/APP5 gel with polymer to “Cr3+” mass ratio of 60:1 could meet the requirements of the theory viscosity value of the reservoir. Finally, indoor physical simulation experiments indicated that when the average water content of oil field reaches 90%, Cr3+/APP5 gel was injected for 0.6 PV, the oilfield economic benefits achieve the best condition.
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