The profile control hard-gel is composed of polyarylamide (5-6g/L), whose molecular weight is 4,000,000 - 7,000,000 and hydrolysis degree is 17.6%, and cross-linking oxidation-reduction agent (Na2Cr2O7 + NH4Cl), with ...The profile control hard-gel is composed of polyarylamide (5-6g/L), whose molecular weight is 4,000,000 - 7,000,000 and hydrolysis degree is 17.6%, and cross-linking oxidation-reduction agent (Na2Cr2O7 + NH4Cl), with an delayed organic acid crosslinker which contains lactic acid/propionic acid/ethanoic acid and ethylene glycol. After research of the influence factors, such as pH, temperature, salinity and the dosage of delayed crosslinker, the optimum condition(pH 5.2, temperature 55℃, salinity < 7g/L) was found. Gelation time (12-144h) can be controlled by adjusting the dosage of the delayed crosslinker. Deep profile control experiments are carried out on heterogeneous models, which contains three serial high permeable and low permeable cores arranged in a parallel. After water flooding (total recovery, 24.3%), the first, second and third high-permeable cores each are sealed in turn by the profile control agent, and the total displacement recovery increases to 46.8%, 62.2% and 69.1% respectively. So, the greater the sealed depth, the larger the enhancing recovery will be. Finally, the oil displacement mechanisms of deep profile control are discussed.展开更多
将不同黏度和质量分数的乙基纤维素（EC）添加到大豆油中,研究EC凝胶剂在油相中的流变性能、凝胶网络结构稳定性、硬度和液态油脂损失率。结果显示,EC油相溶液属于假塑性流体,当EC黏度为7~100 m Pa·s,溶液表观黏度呈现增大趋势,当E...将不同黏度和质量分数的乙基纤维素（EC）添加到大豆油中,研究EC凝胶剂在油相中的流变性能、凝胶网络结构稳定性、硬度和液态油脂损失率。结果显示,EC油相溶液属于假塑性流体,当EC黏度为7~100 m Pa·s,溶液表观黏度呈现增大趋势,当EC黏度为200 m Pa·s时,溶液表观黏度下降;随着EC质量分数增加,溶液表观黏度逐渐增大,并出现凝胶化。其中,当EC质量分数为8%时,EC100凝胶网络对振荡频率的稳定性最好。质构分析显示,凝胶硬度的变化趋势与其网络结构稳定性相一致,EC100凝胶的硬度达到最大175.94 g,同时EC100凝胶的油相损失率最低,仅为3.14%,表明稳定的凝胶网络结构有利于更好地截留液态油。展开更多
文摘The profile control hard-gel is composed of polyarylamide (5-6g/L), whose molecular weight is 4,000,000 - 7,000,000 and hydrolysis degree is 17.6%, and cross-linking oxidation-reduction agent (Na2Cr2O7 + NH4Cl), with an delayed organic acid crosslinker which contains lactic acid/propionic acid/ethanoic acid and ethylene glycol. After research of the influence factors, such as pH, temperature, salinity and the dosage of delayed crosslinker, the optimum condition(pH 5.2, temperature 55℃, salinity < 7g/L) was found. Gelation time (12-144h) can be controlled by adjusting the dosage of the delayed crosslinker. Deep profile control experiments are carried out on heterogeneous models, which contains three serial high permeable and low permeable cores arranged in a parallel. After water flooding (total recovery, 24.3%), the first, second and third high-permeable cores each are sealed in turn by the profile control agent, and the total displacement recovery increases to 46.8%, 62.2% and 69.1% respectively. So, the greater the sealed depth, the larger the enhancing recovery will be. Finally, the oil displacement mechanisms of deep profile control are discussed.
文摘将不同黏度和质量分数的乙基纤维素（EC）添加到大豆油中,研究EC凝胶剂在油相中的流变性能、凝胶网络结构稳定性、硬度和液态油脂损失率。结果显示,EC油相溶液属于假塑性流体,当EC黏度为7~100 m Pa·s,溶液表观黏度呈现增大趋势,当EC黏度为200 m Pa·s时,溶液表观黏度下降;随着EC质量分数增加,溶液表观黏度逐渐增大,并出现凝胶化。其中,当EC质量分数为8%时,EC100凝胶网络对振荡频率的稳定性最好。质构分析显示,凝胶硬度的变化趋势与其网络结构稳定性相一致,EC100凝胶的硬度达到最大175.94 g,同时EC100凝胶的油相损失率最低,仅为3.14%,表明稳定的凝胶网络结构有利于更好地截留液态油。
