二元復合驅油體系靜態吸附規律研究

張棟　吳文祥

摘 要：為了揭示無堿二元復合體系在地層滲流過程中界面張力及體系粘度的變化情況，首先需要對二元復合體系在地層中的吸附規律進行研究。結合大慶油田儲層的實際開發條件在室內模擬其油藏溫度、地下水礦化度，并通過天然巖心制成油砂測定復合體系吸附量。研究結果表明：單獨聚合物體系，當濃度低于1 000 mg/L時聚合物的吸附量與其濃度成線性遞增規律，后隨濃度的增加呈平緩變化；單獨表面活性劑體系，當濃度低于臨界膠束濃度（CMC值）吸附量線性增加至峰值，后呈小幅度降低最終至平緩。由于聚/表二元復合驅油體系中聚合物的加入，在競爭吸附中可以減少了表面活性劑的吸附量。

關 鍵 詞：二元復合體系；靜態吸附；吸附量

中圖分類號：TE 357 文獻標識碼： A 文章編號： 1671-0460（2015）09-2078-03

Abstract： In order to reveal the change law of interfacial tension and viscosity in the seepage flow process of two element compound system in the formation， the adsorption regularity of the SP system was studied. Combined with the actual development conditions of Daqing oil field， reservoir temperature， groundwater salinity and natural oil sand were simulated to determine the adsorption capacity of composite system. The results show that： for single polymer system， the adsorption capacity of the polymer is linear with the concentration when the concentration is lower than of 1 000 mg/L，then the change is mild with the concentration increasing； for single surfactant system， when the concentration is lower than the critical micelle concentration （CMC）， the adsorption capacity of the surfactant system linearly increases to a peak value， and then decreases to a moderate extent. Due to the polymer adding in polymer / surfactant binary combination flooding oil system， the competitive adsorption action can reduce the adsorption quantity of surface active agent.

Key words： SP system； Static adsorption； Adsorption capacity

隨著無堿二元復合體系在油田大規模推廣，大量學者對單獨聚合物及表面活性劑的吸附規律已有了大量研究[1-4]。前自此國內外大量文獻發表了有關于此的優秀成果已經滿足此理論[5]。由于復合體系中各組分間的相互作用比單一組分更加復雜，為了進一步揭示復合體系各組分在地層空隙間的吸附程度對其驅油效率的影響程度，本文通過對二元復合體系在大慶天然油砂上的吸附實驗對其吸附規律進行表征。測定了二元復合體系中聚合物、表活劑在單獨及復配兩種情態下的吸附量，依據靜態吸附數據繪制了吸附等溫線揭示吸附規律。……