Optimization of glue breaking in waste drilling fluid using response surface methodology
The optimization of the breaking process of waste water-based drilling fluid was carried out in view of the problems such as the difficulty of breaking,reuse and secondary pollution of waste water-based drilling fluid.Based on the analysis of the performance of waste water-based drilling fluid,the influence law of each factor in the breaking process of composite breaker was investigated by single factor experiment,and the significant influencing factors of the breaking process were optimized in depth by response surface methodology.The results show that the performance of waste water-based drilling fluid is far from meeting the stipulated indicator requirements of the oilfield operation area,and it must be broken and reused.When the addition amount of XSD is 3.97 kg/m3 waste water-based drilling fluid,the reaction temperature is 51 ℃,and the mixing speed is 419 r/min,the predicted optimal value of the breakthrough rate of waste water-based drilling fluid is up to 62.37％.There is insignificant difference between the predicted optimal value and the experimentally validated value by student's t test.The result provides an accurate and reliable theoretical basis and data source for the harmless treatment of deep and complex drilling fluids.
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