Geothermal energy generating plant

FIELD: power engineering; use of geothermal heat in units using water from external sources.

SUBSTANCE: proposed plant includes vertical delivery well-bore running to earth's crust and vertical outlet well-bore located at some distance from delivery well-bore; provision is made for evacuation of vapor from this well-bore; plant is also provided with horizontal well-bore for connection of two vertical well-bores and at least one section of horizontal well-bore located in hot rock; all said well-bores are provided with casing pipes to exclude contact of liquid flowing through well-bores with soil or underground water; water obtained after condensation of vapor from outlet well-bore is pumped to delivery well-bore and is used repeatedly. Besides that, horizontal well-bore may be entirely located in rock; delivery and outlet well-bores enter hot rock; plant is provided with devices for delivery of water from delivery well-bore to horizontal well-bore. Water admitting to rock is not contaminated in such plant and may be used repeatedly.

EFFECT: enhanced efficiency.

4 cl, 2 dwg

 

Prerequisites to the creation of inventions

The present invention relates to an apparatus for the production of geothermal energy, and more particularly to an improved installation for the production of geothermal energy, which does not use water in the hot rock and use water from an external source, and this water can be reused. It is known that the installation for the production of geothermal energy use for many years. A typical installation involves drilling wells into hot rock, which contains hot water. If the reservoir is dry and hot, the water may be pumped into the well and into the hot rock. Hot rock or contains hot water, or to heat water pumped into it until the water reaches a temperature and pressure that exceeds the conditions necessary for the formation of steam. Hot water flows from wells or pumped out of it, and after removal of the pressure, there is a division of hot water and steam, and the separated steam is used to drive a turbine, which turns an electric generator, or some other mechanism. The generator can be connected to the mains for power transmission to the point of its use, or the energy can be used in place of its receipt. Note that may trebovalsya treatment of groundwater prior to its return to the hot rock. It was found that in the currently used plants for the production of geothermal energy natural water or water that is injected into hot rock, is highly contaminated. This water usually has a high content of solids, and may include forming a scum or corrosive chemicals, or both, which requires treatment before the water can be returned to the hot rock. After using steam for a turbine, the steam is condensed in the aqueous phase, and the produced water is contaminated and requires processing before transmission through pipelines and pools for processing and before its return to the hot rock.

It should also be borne in mind that the use of only wells that pump water from which assign pairs limits the location of a turbine generator, and the wells, as they should be located close to each other, if only one well is used for receiving water, steam extraction and return of water into the reservoir. In addition, the use of a single well limits the residence time of water in the hot rock, resulting in the efficiency of the installation is reduced.

Summary of invention

The present invention allows to overcome specify the s difficulties, moreover, one of its tasks is the creation of an improved installation for the production of geothermal energy, in which the water receiving heat from hot rocks, does not become contaminated, so that it can be reused, and does not require chemical processing after its use in standard water boilers, while this facility is a low volume of water used. Another objective of the present invention is to provide an improved installation for the production of geothermal energy, in which the turbine, which spins a generator or other mechanism and into which steam is fed, does not necessarily have to be located in the immediate vicinity of injection wells used for injection of water into the body of the earth, and can be located at a distance from the well. Another object of the present invention is to provide an improved installation for the production of geothermal energy, which is more effective. Another object of the present invention is to provide an improved installation for the production of geothermal energy, which is easy to install as well can be drilled using the technique of horizontal wells drilling, which is widely used in the nave is Jana industry. Improved installation for the production of geothermal energy is simple in operation. Another objective of the present invention is to provide a setting that does not require the removal of water from the reservoir, which is supported by the pressure in the reservoir.

These and other features of the invention will be more apparent from the subsequent detailed description, given as an example having no limiting character and described with reference to the accompanying drawings. 1 schematically shows an installation for the production of geothermal energy using separate injection (input) and output wells, made in accordance with the present invention. Figure 2 schematically shows an installation for the production of geothermal energy with a combination of input and output wells in a single well.

Detailed description of the invention

We now turn to a consideration of figure 1, showing the installation for the production of geothermal energy in accordance with the present invention. This installation contains injection well 1, which is in the body of the earth 2 from the surface 3 until it meets with a layer or a layer of hot rocks 4 in the thickness of earth 2. In a location remote from the injection well 1 drilled well as output bore 5, which the traveler also comes from the surface 3 in hot rock 4. When the well is approaching the hot rock, it rotates from vertical to horizontal direction 6 and passes through the hot rock 4 at the distance necessary for the proper heating of water, after which the wellbore rotates to the vertical and goes up to the surface. Thus, injection well 1, a horizontal well bore 6 and the output bore 5 form a continuous path from the surface down into the hot rock through the underlying material, and then up to the surface through the well 5. In figure 1, the borehole 6 shows the horizontal, however, it should be borne in mind that, if necessary, the wellbore 6 may have a different orientation. Note that only vertical wells can be drilled horizontal wells. The turbine generator unit 10 or some other mechanism that works by using steam, is located in the immediate vicinity of the output bore 5 and is connected to the output bore 5 so that the steam escaping from the output of the well 5, actuates the turbine generator unit 10 or other similar mechanism to produce energy or to perform some other functions.

With this setup, clean water is injected into the injection well 1 and produce at the point 12, and the water FR is producing through the well bore 6 in the hot rock 4, turning to steam, and then steam out of the ground through the output hole 5 and drives the turbine generator unit 10 or some other mechanism. After condensation of the steam in the condenser 13 pairs is converted into the aqueous phase. The produced water stored in the tank 14, is treated in the installation of 15 and is pumped back to the injection well 1 to repeat the above operations. However, it should be borne in mind that during this operation the mixture of steam and water is contaminated and cannot be reused without proper treatment, as it can adversely affect the operation of the turbine generator unit. Therefore, in each cycle the water goes through a purification process 15 to ensure proper cleanliness.

In order to prevent contamination of the mixture of steam and water during its passage through the well bore 6 in the hot rock 4, the wellbore 6 coated and/or made of a material 7, which is corrosion resistant, so a mixture of steam and water does not come into contact with hot rock 4. Wells 1 and 5, as well as the well bore 6 may be cemented in place in accordance with the performance standards for water and oil wells. As the mixture of steam and water remains clean and can be reused after a block turbo-generator, the water is not removed in scociety. To further prevent contamination of the mixture of steam and water it is also desirable to produce veneer injection wells 1 and output bore 5 by means not subject to corrosion of casing 8 and 9, respectively, with the cementing of these pipes in place. In this case, when the supply of water to the injection well 1, it is not included in the ground contact 2 and is not polluted, and coming out of the exit hole 5 pairs remains clean as it too is not in contact with a layer of earth 2. Therefore, the mixture of steam and water remains clean and can be reused without risk of contamination. Therefore, the installation in accordance with the present invention allows to save water, because there is no need to remove it in the waste water or subjected to expensive cleaning that is required in the case where contaminated groundwater circulating in the installation. It should also be borne in mind that the present invention allows to place the output bore 5 at a location remote from the injection wells 1, and output bore 5 may be drilled in the immediate vicinity of the turbine generator unit 10. Thus, if, for any reason, injection well 1 could not be located in the vicinity of the turbine generator unit 10, it can be drilled at a location remote from him as the well bore 6 may be of any desired length, considering the fact that it is mainly located in the hot rock, and, as a minimum, should have a length sufficient to convert water into steam, which does not result in harmful impact on the effectiveness and operation of the installation in accordance with the present invention.

The present invention allows to create an improved installation for the production of geothermal energy, which is coming in hot rock, the water is not polluted, so that it can be reused, and the turbine-generator or some other mechanism that operate the steam does not need to be located near the injection wells used for injection of water into the soil, and can be located at some distance from the well, with the installation of reduced water consumption, it is more economical, can be easily installed and is simple in operation.

Figure 2 shows a variant of the above-described installation, which contains all the elements of the unit shown in figure 1. It should be borne in mind that all the above results can be obtained by using only vertical wells and one or more horizontal wells. Water flows in a horizontal area of the well through a pipe that goes down in the casing, and follows at the end of sagnay columns. The water then turns into steam, which goes back only from wells and supplied to the turbine.

In both embodiment, the treated water can be at either end of the branch hot water or can be distributed across all areas of the branch hot water.

As seen in the drawings, may be one or more hot branches. All the hot branch can work simultaneously or may be used alternately, when one hot leg work, and other branches are heated up until they will be ready for use.

In the drawings, the hot leg is shown horizontal, but it should be borne in mind that it can be inclined up or down in order to improve its standing in the hot rock.

Note that you may need to clean the hot branches, usually with long intervals between cleanings. This inlet pipe is removed and injected into the hot leg of the cleaning mechanism, which goes along the line, removing growths from the walls, which is usually scum. Wastes are removed and after cleaning the specified inlet pipe return to the place.

Despite what has been described the preferred embodiment of the invention, it is clear that it specialists in this field can be amended and supplemented, which do not extend, however, beyond the scope of p is evidenoe forth in the claims.

1. Installation for the production of geothermal energy, including mainly vertical injection well bore extending from the surface into the thickness of the earth made with the possibility of receiving water, mainly vertical output shaft at a distance from the injection barrel and reaching from the surface into the thickness of the earth made with the possibility of disqualification from it a pair of mainly horizontal wellbore, which connects the two vertical wellbore, and at least one portion of the horizontal wellbore is located in the hot rock, all of these wells have casing that prevents the contacting liquid, passing through the bore, with the soil or groundwater, and the water resulting from the condensation of steam from the output of the wellbore is pumped into the injection wellbore and re-used.

2. Installation according to claim 1, characterized in that the horizontal wellbore is entirely in the rock.

3. Installation according to claim 2, characterized in that the injection and output trunks wells are in hot rock.

4. Installation according to claim 3, characterized in that it is provided with means for discharge of water from the injection wellbore in a horizontal wellbore.



 

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