基于井内实时水力学模型的环空压力计算及分析

Calculation and Analysis on Annulus Pressure Based on the Real-time Borehole Hydraulic Model

摘要:

实时水力学模型是现代钻井工程用于预测井下情况最重要的方法之一，通过分析实时水力学模型的影响因素，建立了一套井筒实时水力学计算与分析模型，包括井筒环空压力和当量循环密度(ECD)的计算。该模型充分考虑了钻柱旋转对速度分布的影响。同时，模型紧密结合参数随温度压力和工况的变化，使计算结果更加贴近井下实际情况，提高了该水力学模型计算结果的准确性，使之更具实用性。

Abstract:

The real-time hydraulics model is one of the most important methods for modern drilling engineering to predict downhole conditions. This paper analyzes the influencing factors of real-time hydraulics model and a set of wellbore real-time hydraulic calculation and analysis model is established. The model takes into account the effect of drill string rotation on the velocity distribution. The model includes the wellbore annular pressure and equivalent circulating density. At the same time, by using the established hydraulic calculation and analysis model, the calculation results are more close to the actual underground situation according to the parameter changes along with the different temperatures and working conditions, which makes this model more practical.