Study on profile control ability of polymer microspheres to heterogeneous formation

ZHAO Shuai; PU Wanfen; LI Kexing; YANG Yang

doi:10.13809/j.cnki.cn32-1825/te.2019.04.010

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Study on profile control ability of polymer microspheres to heterogeneous formation
Issue 4, Pages: 51-56(2019)
Published：2019
DOI： 10.13809/j.cnki.cn32-1825/te.2019.04.010
稿件说明：

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DOI：

ZHAO Shuai, PU Wanfen, LI Kexing, et al. Study on profile control ability of polymer microspheres to heterogeneous formation[J]. Petroleum Reservoir Evaluation and Development, 2019, (4): 51-56. DOI： 10.13809/j.cnki.cn32-1825/te.2019.04.010.

摘要

采用光学显微镜和流变仪对实验室自制的聚合物微球PM1的形貌及流变特性进行了评价。分别通过单和双并联岩心驱替实验系统研究了微球体系渗流速度和浓度对其在多孔介质中的运移和封堵性能的影响以及微球的非均质调控能力。研究结果表明

微球PM1粒径为微米级

具有很高的圆球度

在较高的剪切速率下

其表观黏度与水接近。微球对孔喉的封堵能力随着渗流速度的降低或质量浓度的增加而增强。微球具有较强的非均质调控能力

若将调驱后的低渗岩心相对吸水量≥35%的调驱措施规定为合格的调驱

则微球能够有效改善储层非均质性的渗透率级差上限约为20。对于存在裂缝或大孔道等非均质强的油藏

可考虑采用大尺度和微尺度微球交替段塞复合调驱技术。

Abstract

The morphology and rheological properties of polymer microspheres PM1 were evaluated by optical microscope and rheometer. The effects of injection rate and concentration of microsphere system on the migration and plugging properties in porous media as well as the profile control ability of polymer microspheres to heterogeneous formation were investigated respectively by single core and parallel cores flooding experiments. The results showed that the microspheres had a high degree of sphericity with micro scale and its apparent viscosity was close to water at a relative high shear rate. The plugging ability of microspheres to pore throats increased with the decrease of seepage velocity or the increase of mass concentration. The microspheres had strong profile control ability to heterogeneous formation. If the measures that relative water absorption of low permeable core after profile control and oil displacement was greater than or equal to 35 % could be deemed to be appropriate

the upper limit of the permeability contrast

corresponding to which the microspheres could effectively improve the reservoir heterogeneity

would be about 20. For some strongly heterogeneous reservoirs existing fractures or large pores

the combined technique of profile control and flooding about alternating slugs of large-scale and micro-scale microspheres could be considered preferentially.

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