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3. The surface temperature variation from summer to winter (and in some instances day to day) impacts the well temperature by changing the drilling fluid temperature. Temperatures are further altered by the duration of circulated drilling fluid and drilling conditions. 4. The length of time the well sits between the last circulation of the drilling fluid and the logging of the well impacts the temperature. The logging typically occurs within 6 to 10 hours, but for some wells it is months since drilling so the well starts to return to the undisturbed value. 5. Geologic structure will affect temperatures because of fluid movement along pathways and faults through a stratigraphic zone. The corrected temperature data shows that by 9,000 feet, the majority of Texas, east of the Interstate I-35 corridor is at 200°F or hotter (Figure 14a). The two primary areas with a concentration of temperatures less than 200°F are the North Texas region where values are in the 150-175°F range, and the band along the Gulf Coast with temperatures of 175°F to over 200°F. The hottest areas at 9,000 feet are located in East and South Texas with temperatures reaching 250°F to over 275°F respectively. The corrected temperature data for 12,000 feet has a pattern similar to the 9,000 feet depth level. At 12,000 feet, throughout the entire area, temperatures reach at least 200°F, but more often are at or above 250°F. The hottest areas continue to be East and South Texas with temperatures commonly over 300°F, some measuring as high as 350°F at 12,000 feet. Temperature values continue to increase with depth such that at 13,500 feet the corrected temperatures are consistently over 300°F throughout the majority of the project area (Table 2; Figure 16). At 14,500 feet the average corrected temperature value is 340°F. The number of wells drilled to depths over 15,000 feet is restricted primarily to regions of the Gulf Coast and South Texas because of the sediments being thickest in these areas. Here the average corrected temperature continues to increase to 350°F at 17,500 ft. In the data for this assessment, the deepest well drilled since 2000 is in South Texas along the Gulf Coast, in Brooks County, reaching a depth of 19,829 feet with a temperature of 438°F. The hottest wells are in Hidalgo County, South Texas (450°F at 19,006 feet) and in Lavaca County, west of Houston (452°F at 19,456 feet) 37PDF Image | Texas Geothermal Assessment for the I35 Corridor East
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