纳米微球在岩石矿物表面的静态吸附规律研究
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1.西安石油大学石油工程学院;2.陕西省油气井及储层渗流与岩石力学重点实验室;3.中国石油青海油田勘探事业部

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陕西省自然科学研究计划“纳米聚合物微球在孔喉内壁附着沉积机理及运移分流机制” 项目(编号:2021JM-408);陕西省博士后基金一等资助 “不同介质在致密油藏基质中对原油的排驱机理及数值模拟研究”,(编号:2018BSHYDZZ53);西安石油大学硕士研究生培养项目(编号:YCS192113075)。


Static Adsorption of JCP-1 Nano-spheres on Mineral Surface in Liquid Phase
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College of Petroleum Engineering,Xi’an Shiyou University,Xi’an

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    摘要:

    纳米微球调驱技术已被广泛应用于低渗透油藏开发过程。为开展纳米微球在岩石矿物表面的吸附作用机理研究,需定量表征矿物种类对微球在其表面吸附量的影响。首先,运用淀粉-碘化镉法进行JCP-1纳米微球乳液的浓度标定,进而分别实现了微球在单组分矿物表面、多组分矿物表面的吸附量测定。随后,在所测单组分矿物表面的微球吸附量基础上按照岩石矿物相对含量进行加权叠加,得到多组分矿物表面微球吸附量预测值。结果表明:JCP-1纳米微球在不同矿物表面的静态吸附量差异较大。黏土矿物对微球的吸附能力普遍比非黏土矿物强。对该型微球吸附能力最强的是高岭石,其比吸附能力最弱的石英强14.75倍。微球在钾长石表面的吸附能力远强于在其它两种非黏土矿物表面的吸附能力,吸附量变化值分别是其在钠长石和石英表面的1.96倍和8.42倍。对于多组分矿物表面的微球吸附量,加权叠加方法预测值与实验直接测定值的相对误差在3% 以内。最后,基于纳米微球在孔隙通道运移时的固液界面吸附现象,分析认为孔隙壁面上的黏土矿物强化了微球的吸附作用,有利于改变孔隙半径,实现在“不完全封堵”条件下的“部分液流转向”。

    Abstract:

    Nanospheres have been widely used in low permeability reservoir development. In order to study the adsorption mechanism of nano-spheres on rock and mineral surfaces, it is necessary to quantitatively characterize the influence of mineral types on the adsorption capacity of nano-spheres on rock and mineral surfaces. Firstly, starch - cadmium iodide method was used to calibrate the concentration of JCP-1 nano-microsphere emulsion, and then the adsorption capacity of the microspheres on the surface of single component mineral and multi-component mineral was determined respectively. Then, based on the measured data of microsphere adsorption on the surface of single component minerals, the predicted value of microsphere adsorption on the surface of multi-component minerals was obtained by weighted superposition according to the relative content of rock minerals. The results show that the static adsorption capacity of JCP-1 nanospheres on different mineral surfaces varies greatly. The adsorption capacity of clay minerals to microspheres is generally stronger than that of non-clay minerals. Kaolinite has the strongest adsorption capacity for this type of microspheres, which is 14.75 times stronger than quartz. The adsorption capacity of the microspheres on the surface of potash feldspar is much stronger than that of the other two non-clay minerals, and the variation value of adsorption capacity is 1.96 times and 8.42 times of that on the surface of albite and quartz, respectively. For the adsorption capacity of microspheres on the surface of multi-component minerals, the relative error between the predicted value of weighted superposition method and the measured value is within 3%. Finally, based on the adsorption phenomenon at solid-liquid interface during the migration of nanospheres in pore channels, it is considered that the clay minerals on the pore walls strengthen the adsorption of microspheres, which is beneficial to change the pore radius and achieve "partial fluid flow direction" under the condition of "incomplete plugging".

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  • 收稿日期:2021-12-16
  • 最后修改日期:2022-03-01
  • 录用日期:2022-03-16
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