| 摘要: |
| 利用国产露头砂岩岩心,研究水湿条件下盐水、非离子表面活性剂、阴离子表面活性剂和阳离子表面活性剂溶液 的自发渗吸规律及其对采收率的影响,对比盐水渗吸、表面活性剂溶液渗吸和先盐水渗吸后表面活性剂溶液的渗吸情 况。结果表明:在岩心渗透率范围内，各种溶液渗吸的最终采收率为盐水(0.32为原始含油量),非 离子表面活性剂溶液(0.38 ~0.50)WooiP ’阴离子表面活性剂溶液(0.44 ~0. 阳离子表面活性剂溶液(0.38 ~0.44) 同一类型的非离子表面活性剂在具有特定结构时渗吸效果才达到最好，阴离子表面活性剂的渗吸效果一般好于其他类型表面活性剂;盐水渗吸后再进行表面活性剂渗吸,可提高采收率 |
| 关键词: 自发渗吸 露头砂岩 水湿岩心 表面活性剂 渗吸采收率 |
| DOI： |
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| 基金项目:国家“973”重点基础研究发展计划项目(2005CB221300) |
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| Imbibition behavior of surfactant in water-wet sandstone and its effects on recovery efficiency |
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HAN Dong1,PENG Yu-qiang1,2,GUO Shang-ping1
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(1. Research Institute of Petroleum Exploration and Development,PetroChina, Beijing 100083, China ;2. China Offshore Oilfield Services Company Limited,Beijing 101149, China)
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| Abstract: |
| Spontaneous imbibition behavior of brine, nonionic surfactant solution, anionic surfactant solution, and cationic surfactant solution and its effects on recovery efficiency were studied in water-wet Chinese outcrop sandstones. The imbibition charateristics were compared in brine, surfactant solution, and sequence of brine and surfactant solution. The results show that the ultimate imbibition recovery efficiency of brine is between 0.32 Woo1P and 0 50 Wqq^，where m；ooip refers to the original oil-cut, and that of nonionic surfactants is between 0.38 and 0.50m;ooip , and that of anionic surfactants is between 0.44 Wqq and 0.55 ，and that of cationic surfactants is between 0.38w00IP and 0.44 The same type of nonionic surfactant with a specific structure could reach the best imbibition results. The imbibition recovery efficiency of anionic surfactant is generally better than that of any other type surfactant. Moreover, if cores are first imbibed in brine and then in surfactant solution, the ultimate recovery efficiency will be improved by (002 -0, 04)m;ooip. |
| Key words: spontaneous imbibition outcrop sandstone water-wet cores surfactant imbibition recovery efficiency |
