Oilfield Review January 1989

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PVT Analysis for Oil Reservoirs

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Pressure-volume-temperature (PVT) data have far-reaching applications in reservoir engineering, from estimating reservoir engineering, from estimating reserves to planning surface facilities to marketing crude. This introduction to PVT analysis of oil reservoirs explains how production is simulated in the laboratory based on phase behavior experiments and compositional analysis of reservoir fluid samples.

Using Formation MicroScanner Images

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The Formation MicroScanner tool, introduced three years ago, gives the geologist a high-resolution picture of the borehole wall. Mach has been learned about the tool’s response, image processing and image interpretation. This article takes you through the workings of the tool, and gives an introduction to interpretation of the images.

The Annulus Effect

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When invading mud filtrate displaces hydrocarbon more easily than water, resistivity logs may show an annulus effect: resistivity drops and then rises with investigation depth. A true annulus effect means PRODUCIBLE hydrocarbon, but it’s rare. Scott explains the effect and illustrates false and true annuli with log examples.

Bacteria in the Oil Field: Bad News, Good News

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If you think an oil field is just rock and fluid, you may be surprised to learn that it’s also teeming with bacteria. Although bacteria corrode hardware and block pore paths in the reservoir, the little beggars may also enhance oil recovery.

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