朝阳沟油田低渗透油藏调驱体系性能评价

发布时间：2018-04-11 05:08

本文选题：低渗透 + 溶胶　；参考：《东北石油大学》2015年硕士论文

【摘要】：微纳米颗粒溶胶是一种适合低渗透油藏的新型调剖堵水剂。针对朝阳沟油田的地质情况,开展单一微纳米颗粒溶胶体系室内调驱实验,优化朝阳沟油田微纳米颗粒溶胶注入参数。为了进一步加强微纳米颗粒溶胶体系的驱油效果,开展微纳米颗粒溶胶与表面活性剂体系交替注入实验,对比分析不同方案,优选最佳注入方式。微纳米颗粒溶胶常温常压条件下为浅黄色粘稠液体,配制后的溶液为乳白色液体,静置后有白色絮状物质沉积在容器的底部,为不稳定体系。浓度为0.5%的微纳米颗粒溶胶的界面张力达到10-2数量级,并在较长时间内保持稳定。浓度为0.5%、0.8%的微纳米颗粒溶胶在气测渗透率为150、60、30×10-3μm2的岩心中封堵效果较好,但是浓度为0.8%的微纳米颗粒溶胶体系封堵强度过大,导致微纳米颗粒溶胶在注入过程中容易进入低渗透层发生堵塞,影响剩余油的驱替。选择浓度为0.5%的微纳米颗粒溶胶体系,使微纳米颗粒溶胶在高渗透层内形成封堵。微纳米颗粒溶胶可与表面活性剂产生良好的协同效应,能大幅度降低体系与原油间的界面张力,同时微纳米颗粒之间的集聚作用对岩石孔隙喉道产生堵塞,进而产生良好的调整吸液剖面的作用。多轮次注入方式由于注入压力逐级提高,注入压力相对较低,微纳米颗粒溶胶不进或较少进入中低渗透层,对中低渗透层的伤害小,且有利于表面活性剂进入中低渗透层驱油,从而提高原油采收率。微纳米颗粒溶胶和表面活性剂的注入段塞越小,注入轮次越多,提高采收率越大,驱油效果越好。推荐0.075PV微纳米颗粒溶胶与0.075PV甜菜碱表面活性剂交替3次+0.05PV微纳米颗粒溶胶为最优注入方式。
[Abstract]:Micro-nano-particle sol is a new profile control and water plugging agent for low permeability reservoirs.According to the geological conditions of Chaoyang Gou oilfield, the single micro and nano particle sol system was carried out in laboratory to optimize the injection parameters of micro and nano particles in Chaoyang ditch oilfield.In order to further enhance the oil displacement effect of microparticle sol system, the experiment of alternative injection of microparticle sol and surfactant system was carried out, and different schemes were compared and the best injection method was selected.The colloidal sol is a light yellow viscous liquid at room temperature and atmospheric pressure, the prepared solution is a milky white liquid, and the white flocculent substance is deposited at the bottom of the container after statics, which is an unstable system.The interfacial tension of the sol with 0.5% concentration was 10-2 and remained stable for a long time.When the concentration is 0.5% and 0.8%, the plugging effect is better in the core with gas permeability of 150 ~ 6030 脳 10 ~ (-3) 渭 m ~ (2), but the plugging strength is too high when the concentration is 0.8%.As a result, the microparticle sol is easily plugged into the low permeability layer during the injection process, which affects the displacement of the remaining oil.When the concentration is 0.5%, the microparticle sols can be blocked in the high permeable layer.Microparticle sol can produce good synergistic effect with surfactant, which can greatly reduce the interfacial tension between the system and crude oil, at the same time, the aggregation of micro and nanometer particles can block the pore throat of rock.Thus, the effect of adjusting the absorption profile is good.Because the injection pressure is increased step by step, the injection pressure is relatively low, the microparticle sol does not enter into the medium and low permeability layer, the damage to the medium and low permeability layer is small, and it is favorable for surfactant to drive oil into the low and middle permeable layer.In order to improve oil recovery.The smaller the injection slug of microparticle sol and surfactant is, the more injection cycles are, and the greater the oil recovery is, the better the oil displacement effect is.It is recommended that the optimal injection method of 0.075PV microparticle sol and 0.075PV betaine surfactant alternate three times 0.05PV microparticle sol.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE357.4

【共引文献】