doveton3 - TEMPERATURE AND WATER RESISTIVITY For shale-free...

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TEMPERATURE AND WATER RESISTIVITY For shale-free formations, the conduction of electrical current is almost entirely carried by ions in the formation water. Quantitative calculations of oil or gas saturation are therefore predicated on a knowledge of the formation water resistivity. For any given brine, this value is not constant, but decreases with increasing temperature. A common source of formation water resistivity data is a catalog of laboratory measurements made of samples from drill-stem tests, etc. For example, if you had drilled a well in Stafford County, Kansas and one of your target formations was the Viola Limestone, this is the information that you would see in the KGS Brine Catalog (along with chemical composition of the dissolved solids). Water resistivity catalogs are available in a number of areas that have oil and gas development. Data for samples that are L I I I FORJHATION WATER RESISTMTIES laboratory measurements of produced samples Stafford County, Kansas VIOLA obviously contaminated by acid treatment, excessive mud invasion, etc. are screened out of the catalog, but there is usually some variability left, and the catalog reader should look for a “typical” value. Some of the log analysis
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This note was uploaded on 10/30/2011 for the course PETROLEUM Short cour taught by Professor Dr.paulglover during the Spring '11 term at University of Aberdeen.

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doveton3 - TEMPERATURE AND WATER RESISTIVITY For shale-free...

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