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在高温高压深井中,钻井液流变性受温度和压力的影响较大。研究油基钻井液的高温高压流变特性,建立宾汉流体的流变参数预测模型,对于现场及时调整钻井液性能、精确计算环空压降、实现高温高压井当量循环密度的精确预测及合理控制井底压力具有重要意义。对具有典型配方的油基钻井液在高温高压下的流变特性进行了研究,通过对实验数据进行多元非线性回归分析,建立了预测高温高压条件下油基钻井液表观黏度、塑性黏度和动切力的数学模型。由模型得到的预测值与实测值具有较好的吻合性,相关系数均在0.98以上。该模型可用于深部井段流变参数的预测和现场水力参数的精确计算。
In high temperature and pressure deep wells, drilling fluid rheology is greatly affected by temperature and pressure. The rheological properties of oil-based drilling fluid under high temperature and high pressure were studied, and the rheological parameter prediction model of Bingham fluid was set up. For the on-site drilling fluid performance adjustment, accurate calculation of annulus pressure drop and exact prediction of equivalent circulating density in high temperature and high pressure well Control of bottomhole pressure is of great significance. Rheological properties of oil-based drilling fluids with typical formulations under high temperature and high pressure were studied. By multivariate nonlinear regression analysis of the experimental data, the predictions of apparent viscosity and plastic viscosity of oil-based drilling fluids under high temperature and high pressure Dynamic force of the mathematical model. The predicted values obtained by the model have good agreement with the measured values, and the correlation coefficients are all above 0.98. The model can be used to predict the rheological parameters of deep well sections and to accurately calculate the on-site hydraulic parameters.