泡沫体系多轮次动态吸附及封堵洗油性能评价

发布时间：2018-09-11 11:35

【摘要】：为了研究泡沫体系在吉林油田三个不同区块地层条件下能否发挥作用,首先使用气流法和油水界面张力测量方法分别探讨了温度和矿化度对不同类型表面活性剂产生泡沫的宏观性能性能和洗油能力的影响,并通过测量三轮岩心动态吸附后每一阶段采出液的泡沫性能分析不同体系在不同储层中吸附特点;再次,测定四种运移距离下采出液的泡沫性能,定量分析泡沫体系吸附后的有效作用距离,并进行单管及双管并联岩心流动实验,测定其调驱流动能力;最后,采用五种段塞组合方式进行双管并联交替注入驱油实验,分析高、低渗透率岩心压力和流量变化规律,测定其封堵及驱油效果,并明确段塞大小、组合方式及交替次数。结果表明,针对三个目标区块条件,通过测量泡沫综合指数和界面张力能够从9种泡沫体系筛选出高封堵泡沫体系和高洗油泡沫体系各2种。分析表明,随着温度的升高,泡沫液膜内部层化胶束结构在更薄的厚度停止分层过渡,矿化度的增加给泡沫膜内胶束周围的双电层增加了粒子屏蔽,导致了胶束的有效体积分数减少,泡沫性能下降。经过多轮次岩心吸附后,带有氟碳表面活性剂的泡沫体系每次吸附后泡沫性能均匀下降且下降幅度较小,而以碳氢链为疏水基的表面活性剂经一次吸附后泡沫性能下降明显;石油磺酸盐和重烷基苯磺酸盐在吸附二次后界面张力有明显上升,而甜菜碱型表面活性剂在吸附三次后依旧保持较低的界面张力。四种运移距离下的泡沫性能评价表明,十二烷基硫酸钠和氟碳型表面活性剂复配体系在新木146、红岗高台子、大老爷府区块的有效作用距离分别为80%、60%、60%;低张力甜菜碱型泡沫体系在三个区块的有效作用距离分别为80%、80%、60%。岩心渗透率越低,油层温度和水质矿化度越高,有效作用距离变短。岩心流动实验结果表明,在三个区块的地质条件下,实验所选用的两种泡沫体系的封堵能力与不同因素相关性大小由高到低排序为:岩心渗透率、温度、矿化度。双管并联交替注入驱油实验结果表明,将高洗油和高封堵泡沫体系通过段塞组合方法,优化段塞大小和注入方式,能够得到三个区块分别达到最高采收率时各自的驱替方案,低渗岩心泡沫驱提高采收率范围在17.1%~10.6%。基质岩心渗透率越小,泡沫驱提高采收率幅度越低。
[Abstract]:In order to study whether the foam system can play a role in the formation conditions of three different blocks in Jilin Oilfield, Firstly, the effects of temperature and salinity on the macroscopical properties and oil washing ability of different types of surfactants were studied by using the air flow method and the oil-water interfacial tension measurement method, respectively. The foam characteristics of different systems in different reservoirs were analyzed by measuring the foam properties of the liquid produced at each stage after three rounds of dynamic adsorption of cores. Thirdly, the foam properties of the produced fluids under four migration distances were measured. Quantitative analysis of effective action distance after adsorption of foam system, flow experiment of single tube and double pipe parallel core, determination of its flow capacity of adjusting flooding, finally, using five kinds of slug combination mode to carry out double pipe parallel injection oil displacement experiment, The changes of pressure and flow rate in high and low permeability cores are analyzed, the plugging and oil displacement effects are determined, and the size of slug, combination mode and alternate times are determined. The results show that, according to the three target block conditions, the high plugging foam system and the high washing oil foam system can be selected from 9 kinds of foam systems by measuring the foam synthesis index and interfacial tension. The analysis shows that with the increase of temperature, the laminated micelle structure in the liquid foam film stops the delamination transition at the thinner thickness, and the increase of the salinity increases the particle shielding for the double electric layer around the micelle in the foam film. As a result, the effective volume fraction of the micelles is reduced and the foam properties are decreased. After several rounds of core adsorption, the foam properties of the foam system with fluorocarbon surfactants decreased uniformly after each adsorption, but the foam properties of the hydrophobic surfactants with hydrocarbon chain as hydrophobic base decreased obviously after one adsorption. The interfacial tension of petroleum sulfonate and heavy alkylbenzene sulfonate increased obviously after the second adsorption while the interfacial tension of betaine type surfactant remained low after three times adsorption. The foam performance evaluation at four migration distances showed that the composite system of sodium dodecyl sulfate and fluorocarbon surfactants was used in Xinmu 146Honggang Gaotaizi. The effective action distance of the Dalaoyefu block is 80% and the effective range of the low tension betaine foam system in the three blocks is 80% 80% and 60%, respectively, and the effective action distance of the low tension betaine type foam system in the three blocks is 80%, 80% and 60%, respectively. The lower the core permeability, the higher the reservoir temperature and water quality salinity, and the shorter the effective range. The results of core flow experiments show that under the geological conditions of the three blocks, the plugging ability of the two kinds of foam systems selected in the experiment is in the order of high to low correlation from high to low: core permeability, temperature, and salinity. The experimental results show that the displacement schemes of the three blocks can be obtained by optimizing the slug size and injection mode by combining the high wash oil and high plugging foam system with the slug combination method. The range of oil recovery increased by low permeability core foam flooding is 17.1% 10.6%. The smaller the permeability of matrix core, the lower the range of enhanced recovery by foam flooding.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE39

【相似文献】