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Numerical Simulation and Experimental Study of Reelwell’s Heavy over Light Solution in Vertical Well Sections

Haaland, Anne May
Master thesis
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Haaland_AnneMay.pdf (12.83Mb)
URI
http://hdl.handle.net/11250/2409060
Date
2016-06
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  • Master's theses (TN-IPT 2007-2017) [533]
Abstract
Reelwell has developed the Reelwell Drilling Method (RDM), including the Heavy Over

Light (HOL) solution. The HOL solution allows drilling with simultaneously use of two

different drilling fluids, i.e. a near static drilling fluid with high density for pressure

control on the outside of the drill string and a lighter drilling fluid for hole cleaning

inside the dual drill string. The HOL solution implies the creation of an interface mixing

zone between the heavy and the light fluid in the well annulus outside the drill string.

The HOL solution is mainly used in horizontal sections of the well and provides

increased buoyancy which reduces torque and drag of the drill string. The solution may

also be useful in vertical wells due to the possibility of deeper setting depth for casings.

This goal for this work is to investigate the HOL solution in vertical sections of a well

through simulations using the COMSOL Multiphysics software and experimental work.

For the simulations there were defined several parameters, such as density, plastic

viscosity, and well size. The aim of the simulations was to study the effect of these

parameters on the HOL mixing zone.

The experiments were performed in vertical cylindrical tubes, using water based mud or

oil based mud with various densities and rheology properties. In some of the

experiments a pipe inside the tube was rotated to assist the mixing process. Through the

experimental work it was found that yield strength (YS) and low shear yield stress

(LSYS) has a reducing effect on the development of the mixing zone. Rotation of the

inner pipe made the fluids mix more evenly.

The COMSOL simulations indicated that density and well size affect the speed of the

development of the mixing zone, while plastic viscosity has no or little effect. COMSOL

did not prove to model the mixture process in accordance with the experimental

observations. For further work it may be desirable to further investigate the theoretical

model and to study the effect of other parameters, such as rheology properties of the

fluids, rotational force of an inner pipe and friction from pipe wall.
Description
Master's thesis in Petroleum engineering
Publisher
University of Stavanger, Norway
Series
Masteroppgave/UIS-TN-IPT/2016;

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