a note co 2 Process method for mining abandoned high-temperature gas reservoir geothermal energy

Abstract

The invention relates to the field of gas reservoir development and geothermal energy development, and proposes a process for injecting terrestrial heat of a CO2 mining waste high-temperature gas reservoir in allusion to such development statuses as short effective production period of a high-temperature gas reservoir, gas field well net waste and bad waste of ground pipe transmission facilities. The method can quickly realize recovery of high-temperature waste gas reservoir pressure and efficient mining of geothermal energy through changing the working systems of injecting and mining wells in different phases. In the geothermal mining process, the method can realize the following effects: (1) in earlier stage of injection, the final mining rate of the gas reservoir is improved by a gravity differentiation effect of CO2 and natural gas; (2) after the pressure of the gas reservoir is recovered, a high-purity CO2 gas reservoir can be formed to realize circular injection and mining of supercritical CO2 so as to develop the geothermal energy; and (3) in later stage of developing terrestrial heat, when the gas reservoir has no terrestrial heat developing value, most CO2 can be embedded in the gas reservoir for future use. The method has important significance on improvement of the gas reservoir recovery ratio, later secondary development of the gas reservoir, capacity conversion of oil and gas reservoirs, greenhouse gas embedding and the like.

Description

technical field [0001] The invention relates to the field of oil and gas exploration and development, in particular to a 2 A technical method for exploiting geothermal heat from abandoned high-temperature gas reservoirs. Background technique [0002] Geothermal is a clean and renewable energy with broad development prospects. Compared with other energy sources (such as solar energy, wind energy, tidal energy, and biomass energy), it has high energy intensity, wide distribution, little impact on the natural environment, and low maintenance costs. features. China is located in the Pacific Rim geotropic zone and the Mediterranean-Himalayan geotropic zone, with abundant geothermal resources. Facing the increasingly serious energy crisis and the pressure of energy conservation and emission reduction, vigorously develop geothermal technology, which is expected to replace a large number of conventional fossil fuels. [0003] Supercritical CO 2 As a heat-carrying medium, it is a...

AI Technical Summary

Problems solved by technology

However, the pores of sedimentary rock geothermal reservoirs such as saline layer, ground pressure geothermal and water flooding oil reservoirs are often filled with formation water, and the initial stage of geothermal exploitation must go through a period of water production process for a long time, supercritical CO 2 can become the main working fluid, and CO 2 The long-term interaction with rock and formation water will also cause damage to the physical properties of the reservoir, which limit the supercritical CO 2 Bringing heat into play

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