Oil and Gas Well Projects Since 2000 most of my large projects had to do with various aspects of Oil and Gas Well construction. During that time I have been working with oil field services company Schlumberger - first as a research student, then as a development engineer and finally as an independent consultant. Non-Newtonian Fluid Displacement Non-Newtonian displacement fluid flows in annular geometry was the subject of my thesis at UBC in Vancouver. The task was to model and analyse fluid flow during the primary cementing process of wells. Results of my work included a 2-D numerical flow simulator, several crucial analytical results and a simplified model for assessment of displacement quality. These results have since been published in four papers in major scientific journals and incorporated into Schlumberger engineering advisor tool currently in wide field use. More details. Compressible Fluid Placement Simulator Certain well cementing technologies use foamed cement or spacer. This is usually done to decrease effective fluid density and thus hydrostatic pressure in the well. Simulation of the foamed fluid placement is both difficult and important. It is important because the foams used have large amounts of injected gas (typically nitrogen) - with the volumetric ratios of gas to liquid as high as 250 at atmospheric conditions. Such foams are highly energetic - they expand in volume by many times with pressure variations. This in turn can lead to drastic variations in flow velocities making fluid positions hard to predict and even compromising well security if the placement is not controlled. Simulation for real-life industrial use is complicated by large number of possible well geometries, valve setups and complex pumping schedules. Such a simulation needed to be both robust and quick enough to be used by engineers in the field. As a solution answering these requirements I have developed a Compressible Flow Simulator with the corresponding UI - with the package currently in trial field deployment. Gas Migration Gas migration prevention is one of the primary concerns in well construction and especially well cementing. It can lead to adverse safety and environmental effects as well as loss of reservoir pressure reducing the well output. One of the most crucial periods during which it can occur is setting of the cement. As the cement sets, it gradually becomes self-supporting - reducing the effective pressure and possibly allowing gas to migrate. Schlumberger have developed several products for gas migration prevention. To their specifications I have designed a prototype tool analysing the risk of Gas Migration in particular cases and recommending cementing solutions best suited to the situation. Stress Analysis During the construction and life of the well it can experience temperature and pressure changes. Some of the operations - such as steam injection - can lead to large rapid changes of casing temperature. Well pressure drops during production or increases during well stimulation lead to variations of pressure on the casing. Both of these can generate large stresses on the cement sheath, well casings and bordering formation. These can then lead to compression or tension failure in cement and in more extreme cases casing bursting or formation fracturing. My latest project with Schlumberger deals with improving the stress simulator and developing an integrated analysis tool using the .NET technology. Fish Farming Over the last 10 years I have been involved in a large variety of projects in quite a few countries. In 1998-2001 I have developed a Fish Farming management tool for Selonda Aquaculture Group, SA. The tool used a sophisticated model for simulation of fish growth to optimise fish stock management and production.