The temperature distribution of mineral resources


In the operation of wells and production of geothermal heat temperature cycle is shifting and starts to pass through the points a0 - a2, 3 -, b1, 2 - c2 - a0. During this period, the outlet temperature of the operating reservoir is maximal, and consequently the highest performance (flow rate per well unless not changed and the power consumption for pumping coolant through the manifold is not greatly increased.)

At the end of the maintenance period temperature cycle passes through the points a0 - a2, 3 - b3 - c3 - a0. This is a period of rapid utilization of stocks of heat is not so much a collector as heat accumulated an array of soil covering the production well.

Are you able to restore (to fill up) and how geothermal resources in case of a work well in the summer single answer, we may not get as deep array of soil around the injection well will definitely warm up and cool down the top. At the same time, the lower array of soil around the production wellbore may or likely raise or lower the temperature, and the upper drop due to heat dissipation from the remote wellbore region. It is important to have artesian water at a depth of 1 - 1.5 km, their temperature and mobility. Besides, the collector is separated from the lower and upper horizons of insulating layers of clay can not get the expected (target) amount of heat.

Figure 4 - The temperature distribution subsoil 1 - at the end of operation, 2, 3 - through 8, respectively, and 32 years after the closure operation.

Shown in figure 4 the temperature distribution obtained by the solution of the heat equation by an implicit scheme for the following input data: the depth of the neutral sheet of 25 m, the temperature of the neutral layer 3 ? C, the depth of the exploited reservoir 3 km, power reservoir 300 m, the initial temperature of the rock 250 ? C, the minimum temperature PTC (in the vicinity of the injection well) 65 ? C, the period of minimum temperature of 1 year, the duration of operation of the PTC 10 years, the maximum depth of 6 km temperature calculation.

The calculation results (Fig. 4) show that, if during the operation zone temperature perturbation applies to a relatively small distance from the collector, the recovery period, it quickly covers a large thickness of the host rocks. However, changes in the temperature of the surface layers are small and are unlikely to pose any threat to the environment. Obviously, they can significantly affect the temperature of the neutral layer, only a relatively small depth of the exploited horizon that is rare in practice.

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