Journal
MATERIALS SCIENCE-MEDZIAGOTYRA
Volume 27, Issue 2, Pages 210-216Publisher
KAUNAS UNIV TECH
DOI: 10.5755/j02.ms.23947
Keywords
low molecular weight; clay hydration inhibitor; shale gas; water-based drilling fluids
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Funding
- Opening Fund of Shandong Key Laboratory of Oilfield Chemistry
- Fundamental Research Funds for the Central Universities [19CX05006A]
- Natural Science Basic Research Program of Shaanxi [2020JQ-785]
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PDWC is a novel clay hydration inhibitor that can adsorb on the surface of montmorillonite by its hydroxyl functional group, changing the micro-structure of montmorillonite and increasing the clay particles. However, it was challenging for PDWC to penetrate the inner layer crystal of montmorillonite, as indicated by XRD results.
In order to solve wellbore instability problem, a novel clay hydration inhibitor PDWC for water-based drilling fluids was synthesized by copolymerization of tris hydroxyethyl diallyl ammonium bromide (THDAB), sodium allyl sulfonate (AS) and methyl methacrylate (MMA) initiated by redox initiation in an aqueous solution. PDWC was characterized by Fourier transform infrared spectroscopy (FT-IR), Gel Permeation Chromatography (GPC) and Thermo-gravimetry-Differential Scanning Calorimetry (TGA-DSC), respectively. Evaluation of experiments indicated that PDWC showed superior clay hydration inhibition ability compared to some polymer and inorganic inhibitors. Characterization methods included particle size analysis, FT-IR, X-ray diffraction (XRD) and Scanning Electron Microscope (SEM) were utilized to study the inhibition mechanism of PDWC, it was observed that PDWC can be adsorbed on the surface of sodium montmorillonite (Na-MMT) by its hydroxyl functional group, which changed the micro-structure of Na-MMT and made the clay particles increased obviously. However, results of XRD demonstrated that it was difficult for PDWC to enter the inner layer crystal of Na-MMT.
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