Vertical migration of groundwater


Vertical migration groundwater geothermal gives a much smaller effect in the case is small distribution area.

As such vertical movement of fluids can be observed in the areas of supply or discharge of groundwater by exposing poorly permeable sediments (due to the pressure differential between the underlying and overlying aquifers), in tectonically disturbed zones, due to natural convection in the oil and gas, they must identify and exploit . Even when a limited amount. The use of such deposits bail effective development of geothermal energy.

According to the second problem.

Since all of geothermal power plants in the world are ground, then this is due to their significant disadvantage in doing the turbines on wells, steam or hot water for the transportation lose up to 30% of heat and pressure.

Therefore, to increase the life of the wells, the practice of using geothermal resources in Russia sometimes involves accumulation gidroteplopotentsiala in the summer, when the heat is used for the purposes of solar energy.

The rationale for the break in the use of geothermal heat can be illustrated by the chart in Figure 3 and 4 [7].

Figure 3 - The variation of the flow temperature (fluid groundwater) in the pump (s) in the production well and (b) an increase in circulation time (t)

In Figure 3, we have an example of a graphic image change the coolant temperature in wells and thermal reservoir, which is located at a depth of several kilometers.

t1 (a0 - a1) and t2, 3 (a0 - a2, 3), - a line (graphic), coolant temperature change when it moves down the injection well at different periods of operation. t1 (b1, 2 - c1), t2 (b1, 2 - c2) and t3 (b3 - B3) - a change in temperature of the coolant lines when it moves up the production well at different periods of operation. t0 - a graph of the natural subsurface temperature changes with depth, for the considered geothermal field. Line a2, 3 - b3 (b1, 2) describe the change in temperature of coolant when it moves from the injection manifold to the production well.

In the initial period of operation of wells, changing the temperature of the coolant will match the cycle a0 - a1 - b1, 2 - c1 - a0. During this period, the array of soil around the middle and lower parts of the injector has a high temperature, and therefore the coolant is heated considerably towards the collector. Point A1 is shifted to the right. At the same time as the middle and near-surface soil array around the production well at a low temperature, especially at the surface, the point B1 is shifted to the left (middle and surface layers of the soil cooling coolant accumulating heat to give part of its then as resource depletion thermal reservoir transfer agent at the end of the life of the wells).

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