Volume 36 Issue 5
Oct.  2019
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2019  >  36(5): 534-541
TANG Zhichuan, QIU Zhengsong, ZHONG Hanyi, GUO Baoyu, WANG Xudong, ZHENG Yang. Synthesis and Evaluation of a New Chemical Borehole Wall Strengthener Made from Chitosan-Catechol[J]. DRILLING FLUID & COMPLETION FLUID, 2019, 36(5): 534-541. doi: 10.3969/j.issn.1001-5620.2019.05.002
Citation: TANG Zhichuan, QIU Zhengsong, ZHONG Hanyi, GUO Baoyu, WANG Xudong, ZHENG Yang. Synthesis and Evaluation of a New Chemical Borehole Wall Strengthener Made from Chitosan-Catechol[J]. DRILLING FLUID & COMPLETION FLUID, 2019, 36(5): 534-541. doi: 10.3969/j.issn.1001-5620.2019.05.002
shu

Synthesis and Evaluation of a New Chemical Borehole Wall Strengthener Made from Chitosan-Catechol

doi: 10.3969/j.issn.1001-5620.2019.05.002

  • 1. School of Petroleum Engineering, China University of Petroleum(East China), Qingdao, Shandong 266580;

  • 2. Shengli Drilling Technology Research Institute of Sinopec, Dongying, Shandong 257100;

  • 3. Directional Well Technical Service Branch of BHDC, Tianjin 300280

  • Received Date: 2019-05-07
  • Publish Date: 2019-10-30
    Abstract
  • Borehole wall instability in shale formations is a result of combined action of physical factors and chemical factors. An important measure to stabilize shale formations is to plug the formation with physical particles and to reinforce the chemical bonding of the formations. A new borehole wall strengthener SDGB has been developed with chitosan and a polymer having catechol structure through Schiff base reduction reaction. Study on the performance of SDGB showed that SDGB has aromatic ring, catechol and amino group in its molecules, which can react with metal ions through chelation reaction to form stable covalent bonds. The relative molecular weight of SDGB is about 30,000. The performance of SDGB in strengthening borehole wall through chemical action was studied through lap shear strength test, hot rolling test, uniaxial compressive experiment of rock and SEM experiment. It was found that SDGB had good chemical bonding performance which is able to increase the lap shear strength of rock in water, to increase the compressive strength of rocks after soaking, and to inhibit the hydration and dispersion of shales. SDGB can form cementation in the pore throats of a rock and cement the loose minerals inside the micro fractures of a rock, thereby effectively plugging and strengthening the formation. A water base drilling fluid with stable rheology and filtration property before and after aging at 130℃ for 16 hours, was formulated with SDGB as the key additive.

     

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