渤海稠油油藏“调剖+乳化降黏”技术研究及矿场试验效果

Technology Study of Profile Control and Reducing Viscosity by Emulsification in Heavy Oil Reservoir and the Analysis of Field Test Effect in Bohai Sea

王 楠 刘义刚 张云宝 薛宝庆 卢祥国 曹伟佳

WANG Nan LIU Yigang ZHANG Yunbao XUE Baoqing LU Xiangguo CAO Weijia

渤海地区稠油资源量巨大，但受原油黏度高和储层非均质性严重等不利因素的影响，水驱开发效果较差。为使稠油乳化降黏技术在渤海稠油开发中发挥作用，以LD5-2油田储层和流体为实验对象，开展了稠油油藏“调剖+乳化降黏”技术研究及矿场试验效果分析。参考前期室内物理实验模拟结果，获取数值模拟关键输入参数，包括稠油降黏剂浓度、段塞尺寸和调剖剂段塞尺寸，通过正交试验方案模拟得到注入参数对稠油降黏剂增油降水效果影响的顺序，优化矿场试验方案。结果表明，注入参数对稠油降黏剂增油降水效果影响的主次顺序为：稠油降黏剂段塞尺寸>调剖剂段塞尺寸>稠油降黏剂药剂浓度。综合物理模拟和数值模拟结果，B15井组“调剖+乳化降黏”措施中，最佳降黏剂（非离子表面活性剂）加量和段塞尺寸为：1600 mg/L和0.08 PV，调剖剂药剂组成为：cp=4000 mg/L、聚∶Cr3+=180∶1，段塞尺寸0.03 PV。按该参数组合施工，预计累计产油量62.89×104m3，累计增油量5.61×104m3，采收率增幅3.06%。矿场试验取得明显增油降水效果，截至2017年8月27日，净增油6906.4m3。图5表6参17

The heavy oil resource in Bohai area was huge，but the effect of water flooding development was poor because of the high viscosity of crude oil and the serious heterogeneity of reservoir. In order to make the technology of reducing viscosity by emulsification play an important role in Bohai oilfield development，based on the reservoir and fluid of LD5-2 oilfield，the technology research of profile control and reducing viscosity by emulsification and analysis of field test effect were carried out.Referring to the results of previous physical experiments，the parameters of numerical simulation，including the concentration and slug size of viscosity reducer，slug size of profile control agent were obtained. The influence order of injection parameters on the oil increasing effect of viscosity reducer was obtained by orthogonal experimental scheme simulation，and then the field test scheme was optimized. The results showed that the injection parameters were arranged according to their influence on the oil increasing effect of viscosity reducer in following order：slug size of viscosity reducer>slug size of profile control agent>concentration of viscosity reducer. Combined the results of physical simulation and numerical simulation，B15 well group should adapt the technology of profile control and reducing viscosity by emulsification to improve oil recovery，in which the optimum concentration and slug size of viscosity reducer（nonionic surfactant）were 1600 mg/L and 0.08 PV，the polymer dosage in profile control agent was 4000 mg/L and the ratio between polymer and Cr3+ was 180∶1，and the slug size of profile control agent was 0.03 PV. The cumulative oil production was estimated to 62.89×104 m3，the cumulative oil increment was 5.61×104 m3，and the recovery was increased by 3.06% after construction according to these parameter. The field test had achieved remarkable effect of oil increasing and precipitation. The net increase of oil was 6906.4 m3 as of August 27，2017

10.19346/j.cnki.1000-4092.2019.03.026