sub surface temperature and pressure

Aug 14th, 2016
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Subsurface Temperature and PressureI.Subsurface Temperaturea. BHT bottom hole rock temperature from well and drill stem testingb. Geothermal Gradienti. Range 1.8 to 5.5 oC / 100mii. Average: 2.5 oC / 100 m(25 oC / 1 km)c. Heat Flowi. Heat Flux = Geothermal Gradient x Thermal Conductivity of Rock1. transfer of heat energy per unit area2. Units: watts m-2 = (oC m-1)(W m-1 oC-1)3. Watt = power = energy transfer per unit timea. 1 watt = 1 joule/sec = 1 N-m/secii. Rock Thermal Conductivity: function of porosity and depth of burialLithologyThermal Conductivity (W/m oC)HaliteLimestoneSandstoneShaleCoal5.52.8-3.52.6-4.01.5-2.90.3Moral of Story: rock is a good insulator in generalSteel Bar Comparison ~50Aluminum~150iii. Bottom Hole Temperature Range1. Gulf Coast U.S.15,000 20,000 ft depth ~350 F = 175 C2. Rio Grande Rift15,000 20,000 ft depth

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