A Medium-Order Flow Model for Dynamic Pressure Surges in Tripping Operations

摘要

A simplified dynamic model based on ordinary differential equations that predicts the surge and swab pressures in tripping operations is developed. It is fast and robust, and designed for application in real-time operations where the pressure surges must be predicted and controlled. The drilling mud is described as a Herschel-Bulkley non-Newtonian drilling uid. And simplified continuous flow equations are used for fast computation of frictional pressure gradients. The model can readily be coupled with parameter estimation techniques, to automatically adapt uncertain parameters to measured data, or it can be calibrated manually as we show in this paper. This can be done during field operations if a minimum amount of measuring data are available.