西南石油大学学报(自然科学版)

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A Study on Matching Relationship of Polymer Microsphere Size

LIANG Shoucheng1,2*, LÜ Xin1,2, LIANG Dan1,2, WEN Hongbin3   

  1. 1. State Key Lab of Offshore Oil Exploitation,Dongcheng,Beijing 100027,China
    2. CNOOC Research Institute,Chaoyang,Beijing 100028,China
    3. Shida Oilfield Technical Services Co. Ltd.,China University of Petroleum,Qingdao,Shandong 266580,China
  • Online:2016-02-01 Published:2016-02-01

Abstract:

According to the calculation formula of pore throat size of cores,average pore throat diameter of cores was calculated.
The matching relationship between the pore throat and the polymer microsphere size was researched,through analysis
of plugging effect of polymer microspheres of different sizes injected in cores. The range of ratio of polymer microsphere size
to pore throat diameter of cores was determined when stable plugging performance was obtained. Experiments were conducted
to investigate swelling properties of polymer microspheres,microsphere size change before and after shearing,plugging effect
of different size microspheres,and effect on recovery of profile control of selected polymer microspheres. The experimental
results elucidated the matching relationship between the pore throat and the polymer microsphere size,and provided experimental
evidence for size selection of polymer microsphere under different reservoir conditions. Results show that rational ratio
of polymer microsphere size to pore throat diameter is in the range 0.33~1.50,and then the polymer microsphere has stable plug
effect. When the ratio is in the range of 1.20~1.50,the polymer microsphere has both good plugging effect and good migration
ability.

Key words: polymer microsphere, pore throat of cores, matching relationship, plugging effect, profile control

CLC Number: