Evaluation of flocculation effect of hyperbranched flocculant on waste oil-based drilling fluid
The rheological property of oil-based drilling fluid is seriously deteriorated by the continuous intrusion of poor solid phase such as formation soil,and it is difficult to effectively deal with it by solvent extraction,thermal distillation and other technologies,which will cause waste of resources.In order to realize the reuse of waste oil-based drilling fluid,quaternization and hydrophobic modification were carried out with hyperbranched polymer as the main flocculant,and oil-soluble flocculant with good selectivity was prepared.The molecular structure and thermal stability of the flocculant were determined by infrared spectroscopy,thermogravimetric analysis and other methods,and the effects of the addition of the flocculant on the density,solid phase content and rheological properties of drilling fluid were explored.The flocculant mechanism was analyzed by zeta potential and mineral component analysis.The results showed that when the dosage of flocculant was 1.0‰,the inferior solid phase in the drilling fluid system could be effectively flocculated and deposited,the solid phase clearance rate of the two kinds of oil-based drilling fluid after waste treatment could reach 80.6%and 63.8%,and the density of the treated drilling fluid was 0.733g/cm3 and 0.745g/cm3,respectively.The compatibility and rheology of the treated drilling fluid could meet drilling requirements.It could realize the recycling of drilling fluid.
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