•  
  •  
 

Keywords

Annular fow, fow regime, multiphase drilling kick, vertical well, inclined well

Document Type

Research Article

Abstract

One of the exponentially important drilling parameter has many misconceptions, and prompt confusion is the drilling kick. The current conventional approach assume a single-phase bubble model and neglect the multiphase fow in the drilling kick calculations, which lead to diversifed solutions and misconceptions in well design. Hence, this study presents a mathematical model to analyse the behaviour of gas-liquid fow in diferent well profles, which are vertical and deviated wells up to 60 degree inclination. The model analysed the annular pressure and temperature profles as the infux rise to the surface. The methodology constructed to achieve the objective involve an iterative mathematical model to calculate pressure drop across the wellbore and temperature gradient for single-phase and multiphase fow models, indicating the type of fow regimes at each depth. The results show the impact of the selected parameters on the pressure and temperature generated, which eventually infuence the drilling kick calculations. The annulus pressure increases 44.37% from multiphase vertical well annulus pressure to single-phase annulus pressure, and the pressure increment is higher in highly deviated well profle. It is important to precisely and accurately estimate the gas void fraction since it infuences all two-phase fow parameters such as pressure drop, mixture density, and gas velocity in the annulus. The pressure and temperature profle then developed into a model which incorporates the drilling kick concept. Apart from that, the Z deviation factor which indicates the gas solubility was also studied and included in the simulation.

html

Publication Date

30-9-2021

First Page

23

Last Page

37

Download

Share

COinS