JP2909527B2 - Hot spring heat induction method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot spring heat induction method for utilizing hot springs and geothermal heat in deep wells.

[0002]

2. Description of the Related Art Conventionally, existing hot spring wells or newly excavated hot spring wells are not profitable due to low spring temperature or low spring volume, and are left unrefused. There were quite a few things. In other words, when the spring temperature is low, additional cooking is required, so the cost of boiler equipment, its maintenance, and fuel costs are increased. For this reason, when considerable sales cannot be expected, it has to be left alone. . In addition, there is a problem that if the spring volume is insufficient, the commercial base will not be used.

[0003]

Therefore, temperature logging, electrical resistivity logging, and self-potential logging are carried out for the abandoned hot spring well, and based on the results, the groundwater temperature and the amount of spring water are examined. Then, it turned out that there were some things that could be profitable enough by devising the hot water. That is, when the deep hot water (hot spring water) is lifted by the conventional method, the low-temperature water leached at the upper part of the well falls down from the gap between the wall of the drill hole and the casing and mixes with the high-temperature water to lower the temperature of the hot water. In addition, there is a problem that the temperature of the hot water is lowered in the process of being raised through the hot water pipe in the casing. In addition, even if the spring volume is small, if the spring temperature is high, or if the geothermal energy at the bottom of the well is sufficient, circulating the raised hot springs and inducing and utilizing thermal energy will make it profitable enough. Experiments have shown that it can be taken.

The present invention has been made based on the above circumstances, and a first object of the present invention is to improve the method of pumping a hot spring and maintain the temperature of the well at the bottom of the well to a considerable extent. Another object of the present invention is to provide a new hot-spring heat induction method capable of extracting hot water.

[0005] A second object of the present invention is to remove hot water at the bottom of a well or by taking advantage of the underlying geothermal heat, even if the amount of spring is small. Another object of the present invention is to provide a hot spring heat induction method.

[0006]

In order to solve the above-mentioned problems, the present invention provides a method in which a casing is loaded in a well drilling hole, and a packer is interposed between the casing and the inner wall of the drilling hole. In addition to blocking low-temperature water flowing out of the area, high-temperature water from the bottom of the well is lifted up through the heat insulating pipe, and the inside of the casing is shut off by the inside packer on the upper side of the hot water section. It is characterized in that a part of the pumping water is circulated and injected to maintain a positive pressure for suppressing leaching of low-temperature water.

Further, the present invention provides a method in which a casing is loaded into a well drilling hole, a packer is interposed between the casing and the inner wall of the drilling hole, and low-temperature water flowing out in an area above the casing is shut off. The high-temperature water from the bottom of the well is lifted through the heat insulating pipe, and a part of the hot water and the supplementary water are circulated and injected into the well drilling hole, and are injected so as to keep the water level of the well constant. It is characterized by the following.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The hot spring heat induction method of the present invention will be specifically described below with reference to the illustrated embodiments. FIG. 1 shows the present invention for a hot spring well whose spring temperature is assumed to be low in a normal hot water method. That is, here, the full hole cement 2 is applied to the upper inner wall of the well excavation hole 1 (for example, about 1800 m deep) to a predetermined depth as usual. A liner hanger 3 is prepared on the way, and a cylindrical casing 4 is hung thereby. The casing 4 has a cement packer 5 interposed between the casing 4 and the inner wall of the drilling hole 1 at a position near the lower portion thereof, and blocks the low-temperature water that has flowed out in the upper region so as not to enter the bottom 1a of the well. doing.

In particular, in this embodiment, the inside packer 6 is provided inside the casing 4 below the cement packer 5.
Is provided, thereby blocking the inside of the casing 4 up and down.
A cylindrical strainer 7 forming a is provided to the bottom of the well. On the bottom 1a of the well, for example, a hot water pump 8 in which a hot spring suction port is covered with a stainless steel screen 10 having a slit 10a is installed. Pumping hot water (hot spring water). The hot water pipe 9 is constituted by a heat insulating pipe constituted by a heat insulating double pipe, passes through the inside packer 6, passes through the inside of the casing 4, and extends upward.

[0010] From the hot water storage tank 13, a circulation injection pipe 11 also formed of a heat insulating double pipe passes through the inside of the casing 4, penetrates through the inside packer 6, and opens into the strainer 7. The circulating water flowing through the circulating injection pipe 11 has a considerably high temperature, and the pressure of the circulating water inside the strainer 7 is reduced from the excavation wall by a suitable water pressure adjusting means (not shown) on the ground. It maintains a positive pressure enough to push back the leaching cold groundwater.

As shown in FIG. 2, the heat insulating double pipe constituting the hot water pipe 9 and the circulation water pipe 11 is composed of an inner pipe 21, an insulating layer 22 with an argon backfill, and an outer cylinder 23.
The inner coupling 24 and the outer coupling 25 are connected and extended, respectively.

When hot spring water is guided to the ground using such a configuration, the low-temperature groundwater flowing from the inner wall of the well drilling hole 1 between the liner hanger 3 and the cement packer 5 is removed from the cement packer 5. In particular, since the bottom 1a of the well is cut off from its upper region, there is no danger that the low-temperature groundwater mixes into the hot spring that springs out at the deep part of the well and lowers its temperature. In the lower area (the area surrounded by the strainer 7), the above-mentioned water pressure adjusting means injects the reflux water at a considerable temperature through the circulation injection pipe 11, and as a result, the lower part of the area is leached with low-temperature groundwater. Since it is maintained at a pressure higher than the pressure,
It is possible to take in only hot water (hot spring water) that springs out from the bottom of the well below.

Further, since the hot water pipe 9 has a double heat insulation structure, the hot water raised therethrough does not have a possibility of being cooled in a region above the inside packer 6 and maintains a high temperature state. As it is, it is supplied to the hot water storage tank 13. For this reason, unlike hot springs that are hot-watered by the conventional method, the temperature is maintained at a high level, eliminating the need for additional cooking, or minimizing the need for additional cooking. When the hot spring heat induction method of the invention is applied, the economic efficiency is improved, and the hot spring well can be sufficiently profitable.

In the above embodiment, a part of the hot water is circulated and injected into the area above the hot water part to maintain the positive pressure for suppressing the leaching of the low-temperature water. When the temperature of hot water is sufficiently high, it is not necessary to inject circulating water.

As described above, in the hot spring heat induction method of the above-described embodiment, the casing is loaded in the well drilling hole, the packer is interposed between the casing and the inner wall of the drilling hole, and the well is discharged in the upper region. In addition to shutting off low-temperature water, high-temperature water from the bottom of the well is lifted up through a heat insulating pipe.

In addition, a casing is loaded into the well drilling hole, a packer is interposed between the casing and the inner wall of the drilling hole, and low-temperature water that springs up in an area above the casing is cut off, and a heat insulating pipe is interposed. To lift the hot water from the bottom of the well,
On the upper side of the hot water section, the inside of the casing is shut off by an inside packer, and a part of the hot water is circulated and injected into an area on the upper side of the hot water section to maintain a positive pressure for suppressing the leaching of low-temperature water. It is characterized by the following.

Next, another hot spring heat induction method of the present invention will be specifically described with reference to an embodiment shown in FIG. This embodiment is applied to a hot spring well having a high hot water temperature due to latent geothermal heat, but having a small amount of hot spring. Here, as in the previous embodiment, the liner hanger 3 and the cement packer 5 block low-temperature water that flows into the region between the inner wall of the excavation hole located above the cement packer 5 and the casing from the inside of the casing 4. But inside packer 6
Is not used.

The hot water pump 8 is disposed above the opening of the circulation injection pipe 11 in the hot spring well. The amount of hot water refluxed into the well drilling hole 1 is adjusted by a water level adjusting means (not shown) on the ground so as to keep the operating water level W of the well constant. In this case, for detecting the water level, for example, a pressure water level sensor 12 mounted on the bottom of the hot water pump 8 as in this embodiment is employed. Other configurations are the same as those of the first embodiment.

When the hot spring water is guided to the ground by using such a configuration, the low-temperature groundwater flowing out from the inner wall of the well drilling hole 1 between the liner hanger 3 and the cement packer 5 Since it is cut off from the lower area divided by the cement packer 5, there is no danger of mixing with the high-temperature hot spring water that springs out at the deep part of the well and lowering the temperature. Further, the lower region of the casing 4 (the strainer 7
(Area surrounded by), a considerable amount of reflux hot water is injected by the above-mentioned water level adjusting means via the circulation injection pipe 11,
It is mixed with the high-temperature hot spring water that has springed out there, and further absorbs the potential geothermal energy there to become high temperature.
To return to hot water storage tank 13.

In this case, it is desirable to newly replenish the difference between the used groundwater amount and the spring water amount. But,
Since the heat energy can be taken in the nighttime auxiliary tank for the temporarily used daytime part by pumping it to the auxiliary tank at night, it is possible to easily cope with the time period when the daytime usage is large. Furthermore, since the hot water pipe has a double insulation structure, the hot water to be raised is not cooled during the lifting process, and is supplied to the hot water storage tank 13 while maintaining a high temperature state. become.

As another structure of the heat insulating double tube used in the present invention, a structure in which a vacuum is maintained between the inner tube 21 and the outer tube 23 may be used, or a glass fiber heat insulating material may be used. May be inserted.

As described above, according to the hot spring heat induction method of this embodiment, a casing is loaded into a well drilling hole, a packer is interposed between the casing and the inner wall of the drilling hole, and a well is formed in a region above the well. While cutting off the low-temperature water, the high-temperature water from the bottom of the well is lifted through the heat insulating pipe, a part of the hot water is circulated and injected into the well drilling hole, and the water level of the well is kept constant. It is characterized by being injected so as to keep it.

[0023]

According to the present invention, as described in detail above, a casing is loaded in a well drilling hole, a packer is interposed between the casing and the inner wall of the drilling hole, and water is discharged in a region above the packer. By shutting off the low-temperature water and raising the high-temperature water from the bottom of the well by the hot-water pump, and inside the hot-water unit, the inside of the casing is shut up and down by the inside packer. Since a part of the hot water is circulated and injected into the area to maintain a positive pressure for suppressing the leaching of low-temperature water, the temperature is maintained high unlike hot springs that are hot-watered by the conventional method, Eliminating the need for additional cooking, or reducing the temperature drop to a minimum, for example, even for hot spring wells that have already been left, using the hot spring heat induction method of the present invention, sufficient profit can be obtained, Reuse There is an excellent effect that it is possible. The present invention also provides a well drilling hole, in which a casing is loaded, a packer is interposed between the casing and the inner wall of the drilling hole, and low-temperature water flowing out in an area above the casing is shut off, and a hot water pump is provided. High-temperature water is lifted from the bottom of the well,
By adjusting the water level of the well to keep it constant, even if the amount of spring water is small at the beginning, the hot water at the bottom of the well or the appropriate amount of hot spring water using the potential geothermal heat is recovered. It has an excellent effect that it can be performed.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a first embodiment showing a hot spring heat induction method of the present invention.

FIG. 2 is a partially broken perspective view showing a configuration of a heat insulating double tube employed in the present invention.

FIG. 3 is a schematic configuration diagram showing a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Well drilling hole 2 Full hole cement 3 Liner hanger 4 Casing 5 Cement packer 6 Inside packer 7 Strainer 8 Hot water pump 9 Hot water pipe 11 Circulating injection pipe 12 Pressure water level sensor

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E21B 43/00 E21B 33/10 E21B 43/12

Claims (2)

(57) [Claims] 1. A casing is loaded in a well drilling hole, a packer is interposed between the casing and the inner wall of the drilling hole, low-temperature water flowing out in an area above the casing is cut off, and a heat insulating pipe is interposed. High-temperature water from the bottom of the well is lifted, the inside of the casing is shut off by an inside packer above the hot-water section, and a part of the hot-water is circulated and injected into the area above the hot-water section. A hot-spring heat induction method characterized by maintaining a positive pressure to suppress leaching of water. 2. A casing is loaded in a well drilling hole, a packer is interposed between the casing and the inner wall of the drilling hole, and low-temperature water discharged in a region above the casing is cut off, and a heat insulating pipe is interposed. Hot water from the bottom of the well is lifted, a part of the hot water and replenishment water are circulated and injected into the well drilling hole, and injected so as to keep the water level of the well constant. Hot spring heat induction method.