【摘要】 本文研究了价格低廉的木质素磺酸盐(LS)作为表面活性剂驱油牺牲剂的可能性。研究了 LS 的吸附特性,作为牺牲剂减少石油磺酸盐吸附损失的作用规律和改性木质素磺酸盐对二价金属离子的螯合性能。结果表明:LS 的吸附符合 Langmuir 方程;使用改性 LS 的水溶液对地层进行预处理,可以显著地减少表面活性剂的吸附损失(减少量>60%)。改性木质素磺酸盐作为表面活性剂驱油的牺牲剂具有应用前景。更多还原

【Abstract】 This study is conducted in accordance with a program of field surfactant flooding test in Yumen Oil Field.A series of modified lignosulfonates （acrylic acid grafted, LSM,alkylated,LSN,and ozone-oxidized,LSA） and unmodified lignosulfonate （LS） are used in 1% solution to pretreat kaolinite and the decrease of adsorption of pet- roleum sulfonate （PS） from solntion on the pretreated adsorbent at 28℃ and solid to liquid ratio 1:5 is determined.Of these modified LSs LSN is the best sacrificial agent, leading to a adsorption decrease of 78% against to the blank.NH₄ and Na salts of LSN are better than Mg and Ca salts and LSN with higher molecular weight（NH₄ salt） is more effective for this purpose.The curve of PS adsorption decrease against LSN solu- tion concentration goes through a maximum at～4%,indicating precipitation of PS caused by the exess of LSs as strong electrolyte.Modified LSs themselves are salt-to- lerant and at high concentrations can chelate bivalent cations and lead to dissolving preriously formed precipitations of petroleum sulfonate coexisted with LSs in the solution.Modified LSs are perspective as sacrificial agent fos surfactant flooding.更多还原