A saturated saltwater drilling fluid based on salt-responsive polyampholytes
| Autor: | Chenxi Ye, Guancheng Jiang, Yinbo He, Lili Yang, Wuge Cui |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
chemistry.chemical_classification
Materials science 0211 other engineering and technologies Energy Engineering and Power Technology Emulsion polymerization Charge density Geology 02 engineering and technology Polymer Apparent viscosity 010502 geochemistry & geophysics Geotechnical Engineering and Engineering Geology 01 natural sciences Rheology Chemical engineering chemistry Geochemistry and Petrology Drilling fluid lcsh:TP690-692.5 Bentonite Economic Geology Thermal stability 021108 energy lcsh:Petroleum refining. Petroleum products 0105 earth and related environmental sciences |
| Zdroj: | Petroleum Exploration and Development, Vol 46, Iss 2, Pp 401-406 (2019) |
| ISSN: | 1876-3804 |
| Popis: | Based on special antipolyelectrolyte effect of zwitterion polymer with same quantity of anionic and cationic charges, we developed two types of salt-responsive polyampholytes, one with high molecular weight and low charge density (HvL) and the other with low molecular weight and high charge density (LvH), by inverse emulsion polymerization. Molecular structure and salt-responsiveness of them were characterized by 1H-NMR and rheology measurement, respectively. HvL and LvH were evaluated in saturated-salt bentonite suspension and influences of their ratio on apparent viscosity and fluid loss were investigated as well. The results indicate that HvL is better at decreasing fluid loss while LvH is better at maintaining low viscosity. A saturated saltwater drilling fluid centering on HvL and LvH with simple formula was designed and applied. It is indicated that salt-responsive polyampholytes are fundamentally better than AM-AMPS anionic copolymer and AM-AMPS-DMDAAC amphoteric copolymer. The saturated saltwater drilling fluid has excellent thermal stability, tolerance to bentonite and shale cuttings, and certain resistance to CaCl2. Salt-responsive polyampholytes can be used in KCl-saturated drilling fluid, with universal adaptability. Key Words: salt-responsiveness, antipolyelectrolyte effect, polyampholyte, saturated saltwater drilling fluid |
| Databáze: | OpenAIRE |
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