![]() ![]() In addition, the controller is tested with an emulated connection, with satisfactory performance. Circulation System on Drilling Rigs Typically, the rig circulation system is composed of mud pumps which deliver drilling mud from mud pits to hoses and pipes down to the bottom of the hole. The models are being used to tune the controller, and the controller perform great on set point changes. Drilling hydraulics affect directly drilling performance and this topic will focus on the basic principle of the drilling hydraulics. This model is likely to be able to accurately represent the whole system with updated parameters.The accuracy of the simple models identified reveals simple system dynamics, and a PI controller is considered to be sufficient. A drilling engineer intends to optimize the bit hydraulics on a well with the following characteristics. Models with specific orders are tested at different set points, and one model order produces good accuracy at all the operating points tested. Through testing, the models' validity are tested, and it is concluded that a number of simple models will be needed to represent the whole system given by the simulator. By identifying solely from simulation data, low order models with good fit to validation data are obtained. ![]() Drill bit hydraulics optimization calculator. To simplify the modelling, a black box system identification approach is used. Drill bit hydraulics optimization calculator. Through investigation of simulation data, the current modelling based on first principles, is considered too complex compared to data of the key dynamics. This thesis evaluates current modelling of two-phase flow related to underbalanced drilling, and possible simplifications. This technique calls for injecting of gas into the mud to lower the pressure, with additional inflow of oil and gas to the well as a result. In order to prevent fluids to enter the formations surrounding the well, the well pressure can be lowered below the reservoir pressure, called underbalanced drilling. Oil reservoirs can be sensitive to unfamiliar fluids such as drilling fluids. ![]()
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