稠油油藏Pickering微乳液黏土防膨机理探究
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中国石油大学北京石油工程教育部重点实验室

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国家科技重大专项(2016ZX05031-003-004);中国石油大学(北京)科研基金(No.2462020YXZZ032)。


Research on Mechanism of Pickering Microemulsion Control Swelling of Clay in Heavy Oil Reservoir
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    摘要:

    针对水敏性稠油油藏,抑制黏土膨胀是有效进行热采的前提,然而后续防膨机理尚不十分明确,因此提出一种Pickering微乳液抑制黏土膨胀的方案,通过Fick定律与Langmuir吸附理论相结合,对Pickering微乳液黏土防膨机理进行量化分析。利用疏水纳米SiO2与月桂基三甲基溴化铵(DTAB)复配形成Pickering微乳液,然后测试了微乳液的表面张力和对膨润土的防膨率,且获得了最佳复配方式。最后,以最佳配方进行段塞驱替实验来研究动态防膨效果。其中,机理量化分析表明采用表面吸附进行黏土防膨是可行的,另外纳米SiO2与DTAB在比例为1:2,浓度为0.6wt%时防膨效果最好,驱替实验中显示最佳的段塞注入量为0.2PV。随着Pickering微乳液注入量的增加防膨效果越发明显,但是出口含水率上升速度也随之加快,说明对于渗透率较高的稠油油藏抑制黏土膨胀应适当。

    Abstract:

    Inhibition of clay expansion is a premise of effective thermal recovery in water sensitive heavy oil reservoir, however, a quantitative description of mechanism that stabilizer inhibits clay expansion, which is remaining unclear. First, a Pickering microemulsion applied to control clay swelling was proposed, besides mechanism of expansion inhibition Pickering microemulsion was analyzed by combination of Fick"s law and Langmuir theory of adsorption. Then, effect of Pickering microemulsion formed by the compounded mixtures of hydrophobic nano SiO2 and lauryl three methyl ammonium bromide (DTAB) on water surface tension was tested, and the suppression bentonite’s swelling rate of the Pickering microemulsion was also measured, which obtained optimum formulation. Finally, the dynamic anti-swelling effect of the Pickering microemulsion was studied by slug displacement experiments through best formula. The quantitative analysis shows that it is feasible to prevent clay swelling by surface adsorption. When the ratio of nano-SiO2 to DTAB is 1:2 and the concentration is 0.6wt%, the best inhibition effect of bentonite was obtained. The best slug injection volume is 0.2PV in test. with unceasingly increasing microemulsion injection volume, the anti-swelling effect was more obvious. But the rate of increase of water cut also was accelerated, which indicated that the clay swelling should be properly controlled in heavy oil reservoirs with high permeability.

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  • 收稿日期: 2020-07-05
  • 最后修改日期: 2020-08-04
  • 录用日期: 2020-08-20
  • 在线发布日期: 2021-11-08
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