摘要
实验考察了质量比1∶1的十二烷基苯磺酸钠(SDBS)/辛基苯酚聚氧乙烯醚OP 10盐水溶液流经质量比3∶7的大庆油砂/石英砂填充岩心时的色谱分离效应。表面活性剂总浓度3000mg/L,用5844mg/L的NaCl溶液配液并驱替,注入量2PV,岩心直径0.4cm、长L=1.5和4.5m,用色谱分离因子Fcs(SDBS与OP 10回收率之比,其值>1)定量表示二者色谱分离程度。流经石英砂填充岩心时基本无色谱分离,流经大庆油砂填充岩心时OP 10完全被吸附,SDBS的吸附很严重,色谱分离充分(L=4.5m)。因此,两表面活性剂的吸附差异越大,多孔介质对表面活性剂的吸附越严重,则色谱分离越严重。实验结果表明:注入段塞增大(1PV→2PV),则Fcs减小(20.78→1.67,20℃,1.5m);温度升高(20℃→45℃),则Fcs略减小(1.80→1.73);在SDBS/OP 10溶液中加碱(2000mg/LNaOH)使Fcs由1.67减至1.55,增加前置碱段塞(2000mg/LNaOH)使Fcs再减至1.45(20℃,1.5m);运移距离增加(L由1.5增至4.5m)使Fcs增大(1.67→1.80,20℃);残余油的存在使20℃时Fcs减小(1.67→1.47,1.5m),使45℃时Fcs增大(1.73→1.84,4.5m),这是吸附和油水相分配两因素共同作用的结果。图9表1参2。
The chromatographic separation (CS) of sodium dodecylbenzene sulfonate, SDBS, and nonylphenylpolyoxyethylene OP10(1/1) in mixed solution in salt water flown through a Daqing reservoir sand/quartz (3/7) pack is investigated under conditions of surfactants concentration 3 000 mg/L, NaCl concentration in salt water 5 844 mg/L, injected volume 2 PV, successive salt water injection, diameter of sand pack 0.4 cm and its length L=1.5 and 4.5 m. The extent of CS experessed quantitatively by factor of CS, Fcs, denoted as the ratio of SDBS to OP10 recoveries, a value larger than unit in this case. In quartz sand pack CS is not observed practically and in Daqing reservoir sand pack thorough CS takes place: OP10 is adsorbed completely and SBS—rather significantly. Thus it is stated that the larger the difference in surfactant adsorption and the higher the adsorption in porous medium the more severely CS proceeds. The experimental data show that incereasing the volume of injected slug from 1 to 2 PV leads to decreasing Fcs from 20.78 to 1.67 (20℃,L=1.5 m); raising temperature from 20℃ to 45℃—to slightly decreasing Fcs from 1.80 to 1.73 (4.5 m); introducing alkaline (2 000 mg/L NaOH) into the mixed surfactants solution—to decreasing Fcs from 1.67 to 1.55 and additional alkaline pad (2 000 mg/L NaOH)—to further decreasing Fcs to 1.45(20℃,1.5 m); lengthening flow path from 1.5 to 4.5 m—to increasing Fcs from 1.67 to 1.80 (20℃); the existance of residual oil—to decreasing Fcs from 1.67 to 1.47 at 20℃ (1.5 m) and to increasing Fcs from 1.73 to 1.84 at 45℃ (4.5 m), a result of two factors (adsorption and partition in oil and water phases) functioning together.
出处
《油田化学》
CAS
CSCD
北大核心
2003年第2期163-166,171,共5页
Oilfield Chemistry
基金
国家重点基础研究专项资助项目(编号G19990225)。
关键词
阴离子/非离子表面活性剂
复配体系
色谱分离
充填岩心
化学驱油
油田化学剂
sodium dodecylbenzenesulfonate/nonylphenylpolyoxyethylene OP-10 mixed aqueous solution
surfactants
sand pack
chromatographic separation
influencing factors
adsorption
partition in oil and water phases
chemical EOR
