新型驱油剂DL-15性能与应用

Evaluation and application of a new type of oil displacement agent—DL-15

中石油廊坊分院为改善压裂作业中油藏的油水界面性能,研发了新型驱油剂DL-15。本文对DL-15展开了性能评价和驱油机理探究并介绍其应用。实验表明:0.2%浓度的DL-15在20℃下能使长庆原油界面张力降低至:0.061m N·m^(-1),提高温度或者加入低浓度盐均能进一步改善其界面性能,使之达到10-3m N·m^(-1),耐盐性实验和驱替实验均表明在高矿化度条件下,DL-15依然可以保持较好的界面活性。填砂管实验和岩心驱替实验表明0.5%DL-15相对水洗油,水驱油采收率分别提升10.6%和9.04%。分析DL-15提高采收率的机理,主要是良好的渗透性能、适当的亲水性、低的界面张力共同作用。根据长庆油田现场应用瓜胶—DL-15体系压注采一体化作业动态生产数据,驱油剂DL-15提高采收率性能优越,对比压注采作业前,日产油量提升70%以上。

In order to improve the interfacial properties of reservoir water in fracturing operations, Fracturing Services Institute Petro-China R1PED-Langfang developed a new type of oil displacement agent-DL-15. This paper is related to DL-15＇s performances evaluation, D-15＇s oil displacement mechanism exploration and DL-15＇s appli- cation introduction. A series of experiments show that 0.2%DL-15 at 20℃ can reduce the Changqing crude oil in- terfacial tension to 0.061 mN ·m-L. And the interfacial tension could even reduce to 10-3mN ·m-1 by increasing the temperature or adding a low concentration of salt. Salt tolerance experiments and displacement experiments both show that DL-15 can still maintain a good interfacial activity in high salinity brine. Sand pack flood tests and core displacement tests show the oil recovery by 0.5%DL-15 is 10.6% higher than washing oil out sand and 9.04% high- er than water flooding recovery. The analysis of the DL-15 oil displacement mechanism mainly includes the pene- tration properties, the appropriate hydrophilicity and the low interfacial tension interaction. According the data from Changqing Oilfield application Guar Gum-DL-15 fracture-fill-extraction integrated operation dynamic production, DL-15 enhanced oil recovery performance is superior. And it can help more than 70% daily oil production before the previous injection-production pressure job.