海上稠油低温热化学机理研究与应用

稠油油田存在汽窜、含水率上升、低产低效井等问题。针对存在问题，提出了低温热化学技术，利用自主研发的适应于海上稠油油田高效开发化学体系-磺酸盐类化学体系L?B，协同低温蒸汽的热作用，达到降本增效并提高驱油效率的目的。该体系的静态洗油效率达28.7%。在56 ℃与原油的界面张力为0.086 mN/m，相比于原油与地层水的界面张力降低了99.3%。120 ℃驱油效率可达65.00%，相比于同等温度蒸汽驱提高了8.50%，达到了200 ℃的驱油效果。该技术在渤海某油田应用后，单井最高日产油达32 m3，提高了52.4%，对海上稠油油田提高原油采收率研究具有一定的指导和借鉴意义。

Research and Application of Low Temperature Thermochemistry Mechanism on Offshore Heavy Oil

The development of heavy oil field encounters such problems as steam channeling, water cut rising, and a large number of low production and low efficiency wells. In view of the existing problems, this paper proposed low temperature thermochemistry technique. The chemical system (sulfonate chemical system L?B) was developed independently and adapted to the offshore heavy oil field, which was used to synergize the thermal effect of low temperature steam, so as to reduce the cost and increase the efficiency of oil displacement and improve the efficiency of oil displacement. The static oil washing efficiency of the chemical system is 28.7%. The interfacial tension between crude oil and chemical system is 0.086 mN/m at 56 ℃, which is 99.3% lower than that between crude oil and formation water. The displacement efficiency can reach 65.00% at 120 ℃, which is 8.50% higher than that of steam flooding at the same temperature and achieved the steam injection effect at 200 ℃.After the application on an oilfield in Bohai Sea,the maximum daily oil production of a single well can reach 32 m3, increasing 52.4%. Low temperature thermochemical technique has certain guidance and reference significance for enhancing oil recovery of offshore heavy oil field.