肺表面活性物质
阳离子聚合
聚丙烯酰胺
吸附
提高采收率
盐度
胶束
临界胶束浓度
化学
聚合物
核化学
化学工程
色谱法
水溶液
地质学
高分子化学
有机化学
海洋学
工程类
生物化学
作者
Yingcheng Li,Jun Jin,Zheng Su,Weidong Zhang,Xinning Bao,Baolun Niu,Changhua Yang,Xinyue Wu,Xiaodong Zhai,Li Zhang,Ruibin Guo,Yuan Meng,Xiujie He,Zhiyuan Shen,Hui Zhang,Ou Sha
标识
DOI:10.1016/j.ptlrs.2023.01.001
摘要
The first pilot test of polyacrylamide microsphere alternate surfactant flood (PMAS) with mixtures of anionic-cationic surfactants (Sa/c) was carried out for a high-temperature, high-salinity, and high-hardness sandstone reservoir to demonstrate the potential of this novel technique to improve oil recovery. A critical micelle concentration (CMC) of 4.82 mg/L, an ultralow interfacial tension (IFT) of 8 × 10−4 mN/m, and a high oil solubilization of 22 were obtained. Static and dynamic adsorptions of Sa/c on natural core containing 15 wt% clay were reduced to about 2.20 and 0.30 mg/g-core, respectively, with the addition of adsorption inhibitor (AI). Since June 2014, the pilot test of PMAS was carried out in a Sinopec reservoir with a temperature of 87 °C, a salinity of 260,393 mg/L, and a hardness of 6,401 mg/L. Twelve cycles of alternative injection of 0.0125 PV Sa/c with a concentration of 0.1% and 0.0125 PV polyacrylamide microsphere with a concentration of 0.2% were conducted at an injection rate of 0.1 PV/yr, for a total of 0.3 PV chemical injection. As a result, the net daily oil production increased from 0 t to 6.5 t, and the water cut decreased from 96.3% to 93.8%, leading to an ultimate improved oil recovery of 6.3% original oil-in-place.
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