聚合物表面活性剂的乳化特性及运移规律
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国家重大科技专项“大庆长垣特高含水油田提高采收率示范工程”(项目编号 2011ZX05010);国家重大科技专项“大型油气田及 煤层气开发”(项目编号2011ZX05052)


Emulsifying Properties and Migration Law of Polymer-surfactant Agent
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    摘要:

    聚合物表面活性剂(以下简称聚表剂)具有良好的增黏和乳化特性,为了研究聚合物驱后聚表剂驱现场试 验中采出井乳化比例高、乳化调堵效果突出的特点,通过室内实验开展了不同油水比、矿化度、原油组分和聚表 剂浓度对聚表剂乳状液性能的影响研究,并通过长岩心驱替实验分析了聚表剂及其产生的乳状液的运移规律。 研究结果表明:聚表剂由于具有界面活性和空间位阻效应在驱油过程中产生乳化现象,当聚表剂浓度达到临界 缔合浓度后乳状液稳定性进一步增加,原油组成中胶质和沥青质含量高则乳化现象严重,乳化受到矿化度影响 较小。聚表剂在岩心中能够较聚合物具有均匀的浓度分布,活塞式推进作用明显。在高渗透岩心中,聚表剂注 入初期即可达到乳化条件,中乳化时机在0.2—0.8 PV;在低渗岩心中注入后期乳化现象更明显,中乳化时机在 0.5—0.8 PV。全过程乳化类型为轻、中度水包油型乳化,乳化封堵位置约为注入井井距的58%—75%。因此,在 现场试验中应在乳化封堵后开展采出井压裂,半径至少大于1/4井距。通过适时压裂引效,现场试验压裂提高采 收率达到2.5%以上。

    Abstract:

    Polymer- surfactant agent is characteristic of good viscosity increasing and emulsifying properties,it is necessary to analyse the cause that the production wells were of high emulsification ratio and prominent effect of emulsification in the field test of polymer- surfactan flooding after polymer flooding. The effects of different oil- water ratio,salinity,oil composition and concentration of polymer- surfactant agent on the properties of emulsion were studied,and the law of migration of emulsion produced by polymer-surfactant agent was analyzed through long core flooding experiments. The results showed that the polymer surfactant agent had emulsifying ability during polymer- surfactant flooding due to the surfactant interface activity and steric hindrance effect. When the concentration of polymer- surfactant agent reached up to the critical associating concentration,the emulsion stability further increased,and the emulsification phenomenon was more serious when the gum and asphaltene of the crude oil was higher. While,the salinity had little effect on the emulsification. Compared with polymer,the polymer- surfactant agent had a more uniform concentration distribution in the core,and the piston propelling effect was obvious. In the high permeability core,the polymer-surfactant agent could realize the emulsification at the initial stage of injection,producing time was of 0.2—0.8 PV. In the low permeability core,the emulsification became more obvious at the later stage of injection,and producing time was 0.5—0.8 PV. The emulsification type of the whole process was light and moderate oil-in-water emulsification,and the emulsification sealing position was about 58%—75% of the injection. Therefore,the fracturing time should be designed with the change of injection pressure during the emulsifying sealing,with a radius of at least 1/4 well spacing. The EOR was more than 2.5% through well-timed fracturing initiation.

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  • 在线发布日期: 2021-07-06
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