稠油热采驱油剂的研究与应用

Research and Application of the Displacing Agent for Thermal Production of the Heavy Oil

针对辽河油区欢17块、锦16块稠油热采吞吐中后期暴露的产油量、油汽比明显下降、原油组份发生变化、渗流条件改变、注汽效果不好等一系列问题,本文从两区块油藏的基本情况和开发现状入手,利用室内实验研制出一种稠油热采驱油剂YQ-1,在室内性能评价的基础上进行现场试验。研究结果表明:稠油热采驱油剂YQ-1具有较好的耐热性能,经280℃恒温处理96 h后药剂的表面活性降幅不大;0.5%～2%的YQ-1溶液与稠油(锦16、欢17块)按体积比为7∶3混合,稠油的降黏率可达90%以上;0.2%YQ-1溶液对稠油的洗油率可达90%左右;注入YQ-1溶液后岩心渗透率恢复率为96%,驱油压力下降23.5%～78.7%;YQ-1与联合站破乳剂的配伍性良好,对原油脱水影响不大。现场实施稠油热采驱油剂10井次,实施后本周期与上周期对比,平均单井增产原油288.6吨,平均油气比提高0.1,周期平均生产天数延长71.4天,周期回采水率提高了19.2%。

In view of a series of questions,such as the obvious decline of oil output and oil-steam ratio,the change of components of the crude oil,the change of transfusion condition and the worse effect of injecting steam in the middle and later periods of stream hut-puff thermal production of heavy oil in Liaohe oil region,Huan 17 and Jin 16,based on the basic situation and development present situation of the two oil region,a kind of oil displacement agent（YQ-1）for heavy oil thermal exploitation was developed by laboratory experiment,and the indoor and the field tests were carried to evaluate the performance of the obtained YQ-1.The results showed that,the YQ-1 had good performance of heat-resistance;the surface activity of the YQ-1declined a little after treated at 280℃ for 96 h.The viscosity reducing rate of the heavy oil（Jin 16 and Huan 17） reached above 90% after mixed with 0.5%～2% YQ-1 solution in the volume ratio of 3∶7;the washing-oil degree to the heavy oil,reached about 90% by using 0.2% YQ-1 solution;after injecting the 2%YQ-1 solution,the recovery ratio of the core permeability was 96% and the injection pressure dropped by 23.5%～78.7%;the compatibility between YQ-1 and the union station demulsifier was good,and the addition of the YQ-1 had little influences in the dehydration of the crude oil.A total of 10 times of heavy oil thermal production using YQ-1 had been implemented in the field test.Contrasting the period with the last period,the average single well oil production was increased by 288.6 t,average ratio of gas and oil was enhanced by 0.1,the average production cycle was lengthened 71.4 days,and the water recovery rate was enhanced by 19.2%.