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Texas Geothermal Assessment for the I35 Corridor East

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Texas Geothermal Assessment for the I35 Corridor East ( texas-geothermal-assessment-i35-corridor-east )

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Table 2. Interval depth with average and maximum temperatures for that 1,000 feet interval. Av er a ge Depth Range Number of Uncorrected Feet Wells Temperature A ve r ag e Corrected Temperature M ax im um Corrected Temperature °F °F °F 12,000 - 13,000 13,000 - 14,000 14,000 - 15,000 15,000 - 16,000 16,000 - 17,000 17,000 - 18,000 18,000 - 24,000 879 263 628 283 330 304 159 306 107 319 60 319 46 362 299 363 320 430 340 423 349 420 361 422 358 454 402 544 The deeper (>13,000 feet) temperatures in East Texas were calculated by Negraru et al, (2008) using heat flow values and conductivity. These are determined to be hotter than the wells in South Texas and the Gulf Coastal areas. The wells in this assessment for East Texas are generally less than 13,000 feet, thus in Figure 14b, East Texas has limited accuracy for the depths over 12,000 feet. Wells are not drilled deeper in this area due to the basement rock of the Sabine Uplift being relatively shallow (Figure 5). Here the granitic basement rocks of the Sabine Uplift are expected to be high in natural radioactive elements contributing to the higher than normal heat flow level for this area. It is due to this additional heat generation that at 9,000 feet, East Texas temperatures are warmer than those in North Texas. The purpose of the detailed maps in Figure 14 is to use them as an initial exploration tool, and not for specific site selection. Temperature is one of the variables used when selecting wells to focus on for geothermal energy development. The corrected temperature is a starting point for the power production calculations (Appendix C). From this the fluid will slightly cool as it flows to the surface because of pressure changes and natural thermodynamics. As the fluid moves though the pipe at the well head to the turbine, the temperature will continue to decrease as a function of distance, fluid speed, and pipe insulation. If the fluid from the well is a combination of oil, gas, and brine, then depending upon the power plant design and technology, there may need to be separation of fluids before electrical generation. This process would further decrease the fluid temperature. 38

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