鄯南3区块注水井深部调剖技术研究

发布时间：2018-04-23 09:25

本文选题：非均质 + 调剖　；参考：《西安石油大学》2017年硕士论文

【摘要】：本文通过对鄯南3区块油藏地质特征以及注水开发过程中所存在问题的分析,认为该区块地层非均质性严重,随着注水开发的不断深入,层间、层内矛盾越发凸显,油井普遍液量下降以及含水上升井增多,为改善水驱效率,开展了该区块的注水井深部调剖技术研究。在调研国内外注水井调剖技术的基础上,结合该区块油藏实际情况,经分析认为采用聚合物驱和表面活性剂驱的组合调剖体系,从而进行了深部调剖体系的室内配方研究。研制出适合鄯南3区块油藏条件的复合型冻胶调剖剂、复配表面活性剂,筛选出一种柔性抗盐缓膨颗粒调剖剂,并对调剖剂体系进行室内性能评价。室内评价结果表明:复合型冻胶调剖剂具有很好的选择封堵性、封堵率高、耐温抗盐性能好和热稳定性好等特点;筛选出的缓膨抗盐黏弹颗粒调剖剂具有膨胀速度缓慢、耐温耐盐性好、良好的保水性能和悬浮性能等特点;复配表面活性剂具有10-3mN/m数量级的超低界面张力性能。在室内实验的基础上,将复合型冻胶调剖剂、柔性抗盐缓膨颗粒调剖剂和复配表面活性剂进行组合段塞应用,开展了适合鄯南3区块的调剖技术研究。在区块内优选了鄯南3-29井组,开展了深部调剖先导性试验;该鄯南3-29注水井井组经深部调剖措施后注水启动压力由9.5MPa上升到16.0MPa;吸水指数由措施前29.2m3/MPa·d下降到14.8m3/MPa·d,较措施前下降了49.3%;井组内对应的四口油井在六个月内累计增油达到900吨。先导试验结果表明:研制的复合型冻胶调剖剂、复配表面活性剂,以及筛选的柔性抗盐缓膨颗粒调剖剂通过组合应用能够满足鄯南3区块油藏深部调剖的需要,起到了很好的增油降水效果,对该区块其他井组有一定的推广作用。
[Abstract]:Based on the analysis of reservoir geological characteristics and problems in water injection development in Shannan Block 3, this paper holds that the formation heterogeneity in this block is serious, and with the deepening of water injection development, the inter-layer and intra-layer contradictions become more and more prominent. In order to improve the efficiency of water flooding, the deep profile control technology of water injection wells in this block has been studied in order to improve the efficiency of water flooding. Based on the investigation of profile control technology of water injection wells at home and abroad and the actual situation of the reservoir in this block, it is considered that the combination profile control system of polymer flooding and surfactant flooding is adopted, and the laboratory formula of deep profile control system is studied. A compound gel profile control agent suitable for reservoir conditions in Shannan 3 block was developed. A flexible salt resistant and slowly expanding particle profile control agent was selected and the indoor performance of profile control agent system was evaluated. The results of laboratory evaluation show that the compound gel profile control agent has good selective plugging ability, high plugging rate, good temperature and salt resistance, and good thermal stability, and the selected slowly expanding salt-resistant viscoelastic particle profile control agent has slow expansion rate. High temperature and salt resistance, good water retention and suspension properties, and high interfacial tension with 10-3mN/m order of magnitude were found in the composite surfactants. On the basis of laboratory experiments, the combined slug application of compound gel profile control agent, flexible anti-salt swelling particle profile control agent and compound surfactant was carried out, and the profile control technology suitable for Shannan 3 block was studied. Shannan 3-29 well group was selected in the block, and the deep profile control pilot test was carried out. After deep profile control, the injection start-up pressure increased from 9.5MPa to 16.0MPa, the water absorption index decreased from 29.2m3/MPa d to 14.8m3/MPa d, which was 49.3% lower than before, and the cumulative increase of oil production in four wells in the well group reached 900 tons within six months. The results of pilot test show that the developed compound gel profile control agent, compound surfactant, and the selected profile control agent with flexible salt resistant and slow swelling particles can meet the needs of deep profile control in Shannan 3 block oil reservoir through combined application. It has a good effect of increasing oil and dewatering, and has certain popularizing effect to other well groups in this block.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE357.6

【相似文献】