Three aspects, such as the optimization of calculation model for the minimum gas injection rate, the effect of elevation on the minimum gas injection rate, the effect of air humidity on the minimum gas injection rate, have been reviewed in this paper. Considering the influence of altitude and air humidity, correction factor for gas injection rate is calculated. The value of gas injection for al...

We present an adaptive observer design for a first-order hyperbolic system of Partial Differential Equations with uncertain boundary parameters. The design relies on boundary measurements only, and is based on a backstepping approach. Using a Gradient Descent technique, we prove exponential convergence of the distributed system and estimation of the parameter. This method is applied to the esti...

The main forms of gas kicks into the wellbore during drilling in fractured carbonate reservoirs are underbalanced pressure and gravity displacement. These two have different mechanisms entry well control measures, which require timely identification type kick when it occurs. A two-phase flow model with a wellbore-formation coupling was developed, based on rate models. variation characteristics ...

This study used six fields data alongside correlation heat map to evaluate the field parameters that affect accuracy of bottom hole pressure (BHP) estimation. The oil were acquired using measurement while drilling device collect surface measurements downhole drilling. For two case studies, measured wellbore filled with gasified mud system was utilized, and wellbores drilled rotary jointed drill...

Effective cuttings transport and accurate drilling hydraulics prediction remain issues of concern during operations horizontal, extended reach multilateral wells. While several studies have adopted a two- or three-layered modelling approach to evaluate efficiency, they neglected the effect gas-liquid fluid flow pattern within annulus on transport. An experimental theoretical study was carried o...

K e y w o r d s F o u r t h g r a d e fluid, Unsteady flow, Lie symmetries. 1. I N T R O D U C T I O N In recent years, considerable efforts have been usefully devoted to the s tudy of flow of nonNewton ian fluids. This is ma in ly due to their m a n y appl icat ions in pe t ro leum drilling, manufactu r ing of food and paper, and other similar activities. A vast a m o u n t of l i te ra ture i...