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Enchanced carbon dioxide-based geothermal energy generation systems and methods

A carbon dioxide and energy technology, applied in the field of enhanced carbon dioxide base thermal energy generation systems and methods, can solve problems such as high cost and low overall process

Active Publication Date: 2015-11-18
TERRACOH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, many of these systems have only limited potential due to reasons such as high cost, overall process inefficiency, possible adverse impact on the environment, etc.

Method used

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  • Enchanced carbon dioxide-based geothermal energy generation systems and methods
  • Enchanced carbon dioxide-based geothermal energy generation systems and methods
  • Enchanced carbon dioxide-based geothermal energy generation systems and methods

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0188] Figure 11A Shown is the electricity generated in megawatts (MW) depending on the wellhead temperature of the working fluid or production fluid once produced to the surface. Figure 11B The generated electricity is shown as a function of bottomhole temperature. Wellhead temperature ( Figure 11A ) and bottomhole temperature ( Figure 11B ) is due to Joule-Thompson cooling, which occurs when fluid pressure decreases during fluid ascent in a production well, so that the bottomhole temperature and pressure of the fluid are greater than the wellhead temperature and pressure. Considering that the Joule-Thompson behavior does not occur in the water-based thermal working fluid, the computationally generated Figure 11A and Figure 11B .

[0189] The modeling assumes a reservoir depth of 1500 meters and a production fluid flow rate of 200kg / s, where the production fluid is 99wt% CO 2 and 1 wt% methane, of which 2.0 kg / s methane is separated and combusted to increase the t...

Embodiment 2

[0194] relatively free of CO 2 Capture (data line 310) and ME-CPG systems with carbon dioxide capture (data line 312), CPG-only geothermal energy recovery (data line 314), and methane-only combustion without CO 2 capture (data line 316), and with CO 2 capture (data line 318), Figure 12A and Figure 12B shows that similar data are obtained, but at a reservoir depth of 2500 m rather than at Figure 11A and Figure 11B 1500 meters in.

Embodiment 3

[0196] Figure 13 The electricity generated in megawatts (MW) is shown as a function of the wellhead temperature of the production fluid. Figure 13 Includes data from methane-enhanced geothermal energy production for EOR applications, where geothermal energy is recovered from CO 2 The compressor is further supplemented by waste heat capture.

[0197] The modeling in this embodiment assumes a reservoir depth of 1500 meters and a production fluid flow rate of 100 kg / s. Assuming the production fluid is 20 wt% CO 2 , 1 wt% methane, and the rest are liquid hydrocarbons and brine. The flow rate of methane separated from the production fluid and combusted is assumed to be 0.5 kg / s. The energy recovery system for the EOR system is assumed to be a binary system with a second working fluid, making energy recovery less efficient than the direct turbine systems that can be used in Example 1 and Example 2. Therefore, it is assumed that the energy recovery system has a power system ef...

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Abstract

A system comprises an injection well in communication with an underground reservoir containing a native methane-containing solution at a first temperature, a production well in communication with the reservoir, a supply system providing a non-water based working fluid to the injection well at a second temperature lower than the first temperature, wherein exposure of the working fluid to the native fluid causes a portion of methane to come out of solution to form a production fluid of at least a portion of the working fluid and the portion of methane, and exposure to the first temperatures heats the production fluid to a third temperature higher than the second temperature, wherein the heated production fluid enters the production well, and an energy recovery apparatus in communication with the productions well for converting energy in the production fluid to electricity, heat, or a combination thereof.

Description

[0001] Cross References to Related Applications [0002] This international application claims priority from US Provisional Patent Application No. 61 / 725,270, filed November 12, 2012, which is hereby incorporated by reference in its entirety. Background of the invention [0003] In view of global climate change and in response to the growing desire to reduce dependence on foreign oil supplies, renewable energy systems such as wind, solar and geothermal energy based systems are increasingly being researched and developed. However, many of these systems have only limited potential due to reasons such as high cost, overall process inefficiency, possible adverse impact on the environment, etc. Summary of the invention [0004] This disclosure describes the use of non-aqueous working fluids, such as carbon dioxide (CO 2 ), a system and method for efficiently recovering geothermal heat from a reservoir by injecting into a reservoir to extract geothermal heat. CO 2 can then be m...

Claims

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Application Information

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IPC IPC(8): E21B43/24E21B43/16
CPCE21B43/24E21B43/164E21B43/40F24J3/085Y02P90/70F24T10/20Y02E10/10F03G4/026
Inventor 吉米·布莱恩·兰道夫
Owner TERRACOH INC
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