Volume 33 Issue 1
Jan.  2016
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WANG Weiji, QIU Zhengsong, HUANG Wei'an, ZHONG Hanyi, BAO Dan. Preparation and Characteristics of Nano Polymer Microspheres Used as Plugging Agent in Drilling Fluid[J]. DRILLING FLUID & COMPLETION FLUID, 2016, 33(1): 33-36. doi: 10.3969/j.issn.1001-5620.2016.01.007
Citation: WANG Weiji, QIU Zhengsong, HUANG Wei'an, ZHONG Hanyi, BAO Dan. Preparation and Characteristics of Nano Polymer Microspheres Used as Plugging Agent in Drilling Fluid[J]. DRILLING FLUID & COMPLETION FLUID, 2016, 33(1): 33-36. doi: 10.3969/j.issn.1001-5620.2016.01.007
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Preparation and Characteristics of Nano Polymer Microspheres Used as Plugging Agent in Drilling Fluid

doi: 10.3969/j.issn.1001-5620.2016.01.007

  • College of Petroleum Engineering, China University of Petroleum, Qingdao Shandong 266580, China

  • Received Date: 2015-11-09
  • Publish Date: 2016-01-30
    Abstract
  • Conventional plugging agents can hardly form mud cakes on the surface of shales because of the very low permeability and very small size of pore throat in shales. Nano particles, on the other hand, are easy to block the pore throats in shales, hence to hinder the invasion of liquid phase of drilling fluid, to maintain the stability of borehole wall, and to protect reservoir formations. A nano polymer microsphere plugging agent, SD-Seal, was developed through emulsion polymerization, using styrene and methylmethacrylate as reactive monomers and KPS as initiator. Laboratory studies show that SD-Seal particles have good dispersity and regular shapes (mostly spherical). The particle size of SD-Seal is about 20 mm, and the decomposition temperature is 402.5℃. Test of SD-Seal on rock sample taken from the Maxi Formation reducesthe permeability of the rock by 95%.

     

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