ABSTRACT
Computer software is used extensively to increase productivity and reduce man’s hours of labour. This work presents the development of a solids control software (SOLCON) which is designed for real time mud system management and quick performance of routine rig computations: determination of total solids and low gravity solids content; mud property and density control requiring optimal ejection rate into the mixing pit; volume of mud and amount of barite, bentonite and additives to be added during the upgrading process of the mud. This software has the ability to evaluate the need for dilution depending on the maximum allowable drilled solids, viscosity and recommended total solids in the drilling fluid.
Finally, this software provides the atmosphere to control drilled solids as quickly as possible with all the necessary parameters.
CHAPTER ONE
FORMULATION OF THE PROBLEM
1.1 Introduction
Drilling fluid was introduced into the rotary drilling technology as means of transporting the drilled solids to the surface. Other function of the drilling fluids are controlling subsurface pressure, lubricating the drill string, cleaning the bottom of the hole, aiding in formation evaluation protecting formation productivity and aiding formation stability (Moore, 1986). One major function of the rig circulation system is the removal of drilled solids from the drilling mud before recirculation because of the adverse effects the drilled solids have on the drilling rate. One way of reducing drilling cost is the maximization of drilled solids removal from the drilling fluid (Field, 1972). For sometimes now the industry has battled with various unsatisfactory solutions to the problem of solids control. These included the following:
1. A piecemeal, temporary and very expensive way to reduce solids content is by discarding part of the system and rebuilding volume with added solids, water and chemical additives.
2. The use of „inhibitors‟ such as lime and polymers to reduce the contribution of drilled solids to mud. Generally, these materials only delays the time when a mud must be discarded.
3. A benefit more apparent than real way is the use „thinners‟. Thinners can reduce the gel strength and the yield point of the mud (Nelson, 1970).
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