Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Transient Mathematical Model for Kick Detection
Submission Author:
Jonathan Galdino , PR
Co-Authors:
Gabriel Merhy de Oliveira, Admilson Franco, Cezar Otaviano Ribeiro Negrao, Jonathan Galdino
Presenter: Jonathan Galdino
doi://10.26678/ABCM.COBEM2017.COB17-0649
Abstract
During well drilling operations, kicks must be detected as soon as possible in order to avoid any risk of blowout. However, due to the lack of instrumentation in drilling operations, kicks are still detected by the pit-gain, which usually takes place after a significant amount of fluid had invaded the well. Changes in the downhole and pump pressures, increase in the outlet flow rate and changes in the speed of sound may also indicate the formation influx. The current work presents a transient model to evaluate the changes in the pump and downhole pressures, outlet flow rate, pit-gain and speed of sound in order to detect a kick faster. The model is based on the mass and momentum balances applied to gas-drilling fluid mixture and also accounts the drilling fluid viscoplasticity and compressibility. The results of the model allow a better understanding of the parameters variations caused by a gas kick, which can improve the kick detection, increasing the rig safety and decreasing the costs of the well drilling operation.
Keywords
kick, pit-gain, compressibility, transient
