阳离子表面活性剂预处理地层延长防垢剂挤注返排寿命实验研究*
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中国石油大学(华东)石油工程学院

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中国海洋石油集团有限公司重大科技项目:“南海西部油田上产2000万方关键技术研究”课题1“南海西部在生产油气田提高采收率技术研究”(课题编号:CNOOC-KJ 135 ZDXM 38 ZJ 01 ZJ)


Cationic Surfactant Pretreats Formation to Enhance Squeeze Life of Scale Inhibitor
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College of Petroleum Engineering,China University of Petroleum,Qingdao

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    摘要:

    海上油田注海水开发,注入水与地层水的不配伍常导致油井硫酸盐结垢现象严重。虽然可以采取挤注工艺防垢,但防垢剂返排寿命一般较短。本文考虑在前置液中添加吸附增强剂,以提高防垢剂在地层中的吸附量和降低防垢剂解吸速度,选择季铵盐表面活性剂DTAC和阳离子Gemini表面活性剂GS-A6为吸附增强剂、选择聚丙烯酸钠PAAS为防垢剂,开展了吸附增强剂与防垢剂的配伍性实验、静态吸附实验和动态吸附-解吸实验。结果表明,在120℃下,两种吸附增强剂与防垢剂的配伍性良好,吸附增强剂可以有效提高防垢剂在地层中的吸附量,延长防垢剂的返排寿命;其中,吸附增强剂DTAC受含油饱和度影响较大,在高含油饱和度时吸附增强效果有明显下降,而吸附增强剂GS-A6在不同浓度、不同含油饱和度情况下均具有稳定的吸附增强效果,适用于不同开发阶段的油井防垢。

    Abstract:

    In the process of seawater injection development in offshore oilfields, the incompatibility of injected water and formation water often leads to serious sulfate scaling in oil wells. Although the squeeze treatment can be used to prevent scale, the squeeze life of the scale inhibitor is generally shorter. This article considers adding an adsorption enhancer to the pre-flush to increase the adsorption capacity of the scale inhibitor in the formation and reduce the desorption speed of the scale inhibitor. Quaternary ammonium surfactant DTAC and cationic gemini surfactant GS-A6 were selected as adsorption enhancers, and sodium polyacrylate PAAS was selected as scale inhibitor. The compatibility experiment, static adsorption experiment and dynamic adsorption-desorption experiment of adsorption promoter and scale inhibitor were carried out. The results show that at 120℃, the two adsorption enhancers have good compatibility with the scale inhibitor, and the adsorption enhancer can effectively increase the adsorption amount of the scale inhibitor in the formation and prolong the squeeze life of the scale inhibitor. The adsorption enhancer DTAC was greatly affected by oil saturation, and the adsorption enhancement effect decreased significantly at high oil saturation. The adsorption enhancer GS-A6 has a stable adsorption enhancement effect under different concentrations and different oil saturation conditions, and is suitable for oil well scale inhibition in different development stages.

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  • 收稿日期:2021-10-25
  • 最后修改日期:2021-11-22
  • 录用日期:2021-11-23
  • 在线发布日期: 2022-04-23
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