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DATA CORRECTIONS The temperature data in this assessment are from oil and gas wells. In order to give value to the data, multiple steps were taken to determine well data accuracy and correct for differences in raw data versus in-situ temperatures. In a best case scenario, the temperatures would be from measurements of wells at equilibrium with high precision gear. This is rarely possible. To improve the collected data, corrections to the data and comparisons of the data were made with more accurate methods. This section describes the data and these corrections and comparisons. While drilling a well, fluid is injected and circulated from the surface to the drill bit in order to cool the bit, stabilize the borehole walls, and clear the cuttings from the borehole. The mud and fluids impact the surrounding rock formations, thereby cooling the borehole at the deeper depths and potentially heating it in the shallow depths depending on the surface air temperature, drilling speed, type of drilling fluid, etc. Most logging tools have maximum reading thermometers included with the other data recorders. Logging of the well usually occurs after initial drilling ceases and before the well section is cased. Therefore, an individual well can have more than one bottom-hole temperature (BHT) measurement, making these interval maximum temperature measurements. if multiple sections were logged. For a well to return to the original, in-situ temperature, there is a period of reequilibration. Many factors can affect the time needed for this process to occur. Some of these factors include the thermal conductivity of the rock formations, pore fluid movement, and drilling conditions. The process of reequilibration generally takes several times the drilling period depending on the post- drilling activities (Harrison and Luza, 1985). To adjust for these differences the well log header temperatures are given a correction. Next is discussed how each data set was corrected. The data included in this assessment are available in spreadsheet format in Appendix B. Data Review The Fairway Field data were acquired through the in-house files of Hunt Oil Company. This allowed for different types of available well log data (pressure, injection, production) from the 40 years of production to be used in reviewing individual wells. Within this data set, if a well had multiple temperatures collected at the same depth, the temperature used was determined by repeatability of the value and the standard deviation from those around it. 19PDF Image | Texas Geothermal Assessment for the I35 Corridor East
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