Volume 33 Issue 6
Nov.  2016
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TANG Zhichuan, QIU Zhengsong, ZHONG Hanyi, ZHANG Xin, ZHANG Daoming. Shale Inhibition Characteristics of a New Polyamide-Amine Dendrimer[J]. DRILLING FLUID & COMPLETION FLUID, 2016, 33(6): 28-32. doi: 10.3969/j.issn.1001-5620.2016.06.005
Citation: TANG Zhichuan, QIU Zhengsong, ZHONG Hanyi, ZHANG Xin, ZHANG Daoming. Shale Inhibition Characteristics of a New Polyamide-Amine Dendrimer[J]. DRILLING FLUID & COMPLETION FLUID, 2016, 33(6): 28-32. doi: 10.3969/j.issn.1001-5620.2016.06.005

Shale Inhibition Characteristics of a New Polyamide-Amine Dendrimer

doi: 10.3969/j.issn.1001-5620.2016.06.005
  • Received Date: 2016-09-24
  • Publish Date: 2016-11-30
  • Dendrimers, because of their unique molecular structures and characteristics, have been receiving more and more attention in recent years. Polyamide-amine (PAMAM), the most understood dendrimer, has been widely used in many felds, including oilfeld chemistry. In a recent study, the inhibitive capacity of PAMAM with different generations was evaluated through bentonite yield test, hot rolling test and particle size distribution test etc. Using surface tension tester, Zeta potentiometer and X-ray diffraction tester, PAMAMs of different generations were characterized. It has been shown that PAMAM s of different generations (G0-G5) all have superior shale inhibitive capacity, better than that of KCl and Ultrahib (a polyamine product used as a shale inhibitor). The adsorption of PAMAMs in between the layers of clay is related to their concentrations. At low concentrations, the adsorption is monolayer adsorption; at higher concentrations, the adsorption becomes double-layer adsorption. PAMAM has high intensity of amine base at its surface, and after partial protonation in water, it is adsorbed on to the surface of clay particles through electrostatic force and hydrogen bond, reducing the hydration repulsion of clay particles and squeezing interlayer water molecules out of clay, thereby inhibiting the hydration and dispersion of shales.

     

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