JP3000209B2 - Hot spring hot water 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 water pumping method for effectively utilizing the geothermal energy of a hot spring in a deep well.

[0002]

2. Description of the Related Art In recent years, a depth of 100% has been used as part of the leisure or health improvement of the people and as an effective use of geothermal energy.
Many hot springs and geothermal wells of 0 m or more are drilled.

[0003] A problem at that time is a temperature drop due to heat loss from the hot water pipe wall or the casing wall when the hot spring is pumped out. The heat loss from the casing wall is also affected by the condition around the casing wall, for example, the presence or absence of low-temperature groundwater, and cannot be ignored. For this reason, after-blowing is necessary, and equipment costs for boilers and the like, maintenance costs thereof, and running costs such as fuel costs are required. As a result, profitability is deteriorated, and in the worst case, it has to be neglected. If the spring volume is insufficient, there is a problem that the commercial base will not be used.

A temperature well, an electric resistivity detection, and a self-potential detection are performed on a temperature well that has been left undisturbed. Based on the results, the groundwater temperature and the amount of spring are examined. It turned out that there was something profitable enough.

[0005] That is, when deep water is pumped by a conventional method, the temperature of the hot water is lowered in the process of rising through a hot water pipe in the casing, or heat loss from the casing wall is reduced. There was such a problem.

Japanese Patent Laid-Open Publication No. Hei 8-4469, "Hot Spring Heat Induction Method" discloses a method of inserting a hot water pipe with a submersible pump to the bottom of a well and pumping out hot springs. Since it is located at a position, it becomes a special type, maintenance costs and days are required, and the motor capacity is large, so the power cost is increased, and there is a problem in replacing parts in case of failure.

Accordingly, the applicant of the present invention has previously filed Japanese Patent Application No. 8-93.
No. 515 filed an application for a hot spring method. This is Figure 5
As shown in the figure, insulated casings 4 and 4a penetrated and installed in the well drilling holes 1 and 1b, and a screen 10b having a slit was attached to the lower end thereof. The upper casing 4a is filled with full-hole cement 2 between the inner wall of the well drilling hole 1b and the well drilling hole 1b.
The spring water from the inner wall was prevented.

[0008] 3a is a packer, the upper casing 4a
Between the lower end of the casing 4 and the upper end of the casing 4 (lower side) to prevent spring water from entering from the inlet 4b at the upper end of the casing 4. A cement packer 5 is installed at a lower portion of the casing 4 so that the spring water from the well drilling hole 1 flows down the outside of the casing 4 and infiltrates from the screen 10b so that the temperature of the hot water does not drop. There were cases. 8a is a hot water suction pipe, 8b is a hot water push-up pipe, both of which form a hot water pipe, a corrosion-resistant insulated double pipe is used, and the gap between the inner and outer pipes is filled with an insulating layer with an argon backfill. It had been.

Reference numeral 14 denotes a housing. Reference numeral 8 denotes a submersible pump. A hot water suction pipe 8a extends from the bottom of the housing 14 to the bottom 1a of the well, and a hot water push-up pipe 8b of the submersible pump 8 passes through the upper surface of the housing 14. It was piped to the hot water storage tank 13 on the ground. Non-return valves 15a and 15b are attached to the lower part of the hot water suction pipe 8a and the hot water storage tank 13 of the hot water push-up pipe 8b, respectively. The hot water in the hot water suction pipe 8a is prevented from dropping due to the pressure difference, and the check valve 15b is used to prevent the hot water in the hot water storage tank 13 from returning, thereby ensuring smooth operation.

[0010]

However, in the above-mentioned conventional "hot-spring method for hot springs", the entire load of the housing 14, the hot-water suction pipe 8a, the submersible pump 8 and the like is received by the hot-water push-up pipe 8b. In addition, the size of the pipe becomes large due to its strength, and it is difficult to handle. When the submersible pump 8 is repaired on the ground, a large crane is required.

Further, it is necessary to seal the inside of the housing 14 so that cold water does not permeate, and maintenance is troublesome.

Furthermore, if gas is contained in the hot spring water, the gas may enter the housing 14 and the submersible pump may not function properly.

The present invention has been made in view of the above-mentioned circumstances, and is a hot spring in which a load is not applied to the hot water push-up pipe 8b, maintenance is simple, and gas can easily escape from above the casing. The present invention provides a method of deep-floating hot water.

[0014]

According to the present invention, there is provided a hot-water hot-water pumping method according to the present invention, wherein a casing or an insulated casing is penetrated into a well excavation hole up to the bottom of the well, and loaded into the well. An auxiliary casing having a bottom surface with open top surface, or an insulated auxiliary casing with bottom surface with open top surface is inserted, and an insulated hot water suction pipe is suspended from the bottom of the auxiliary casing to near the bottom of the hole, A submersible pump is arranged at the bottom in the auxiliary casing, a hot water push-up pipe insulated from the submersible pump is piped to a hot water storage tank on the ground, and high-temperature water flowing from the bottom of the well is supplied to the hot water suction pipe and the auxiliary casing. Then, the water is sucked by the submersible pump and supplied to the hot water storage tank through the hot water push-up pipe.

Further, a casing or an insulated casing is penetrated into the well excavation hole and charged to the bottom of the well, and an auxiliary casing having a bottom surface opened at the top of the casing or an insulated and bottom surface opened at the top surface. Inserting the auxiliary casing, disposing a packer under the bottom of the auxiliary casing, suspending the insulated hot water suction pipe passing through the bottom of the auxiliary casing and the packer to near the bottom of the hole,
A submersible pump is arranged at the bottom in the auxiliary casing,
A hot water push-up pipe insulated from this submersible pump is piped to a hot water storage tank on the ground, and high-temperature water flowing from the bottom of the well is suctioned by the submersible pump through the hot water suction pipe and the auxiliary casing, and the hot water push-up is performed. The hot water is supplied to the hot water storage tank through a pipe.

Further, the casing, the auxiliary casing, and / or the hot water pipe composed of suction and push-up pipes are made of a steel or resin pipe as an outer pipe and a resin pipe as an inner pipe in order to improve heat insulation and corrosion resistance. The heavy pipe is sealed with a vacuum or inert gas after the insulation has been inserted in between.

Further, the casing, the auxiliary casing and / or the suction pipe composed of suction and lifting are double pipes composed of inner and outer pipes of a steel pipe, and after a heat insulating material is inserted therebetween, vacuum or inert gas is discharged. Both the outer tube outer wall and the inner tube inner wall are sealed with a resin tube or coated with a corrosion-resistant material made of resin.

Further, the casing, the auxiliary casing and / or the hot water pipe are double pipes whose outer pipe is made of steel or stainless steel and whose inner pipe is made of stainless steel in order to improve heat insulation and corrosion resistance. After the insulation is inserted, the vacuum or inert gas is sealed.

In addition, a stainless steel plate is attached to the outer tube and / or the inner tube of both or one of the outer tube and the inner tube.

In the lower part of the suction pipe and / or the push-up pipe of the hot water pipe, only the high temperature range near the bottom of the hole is formed of a normal pipe other than the insulated double pipe.

The connection of the double pipe is connected to the threaded joint with a pad for preventing corrosion and flow fluctuation, and the inner surface of the joint is formed flat.

Further, the double pipe is sealed at both ends of the inner pipe and the outer pipe by a screw connection incorporating a seal ring.

[0023]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 is a cross-sectional view illustrating an embodiment of the present invention, FIG. 2 is a cross-sectional view illustrating another embodiment of the present invention, and FIG. 3 is a casing and an auxiliary casing of the present invention and a part of a joint thereof. FIG. 4A is a sectional view showing a case where a seal ring is not provided, FIG. 4B is a view showing a case where a seal ring is provided, and FIG. (A) is a case where there is no seal ring, and (b) is a case where there is a seal ring.

In FIG. 1, similarly to the prior art, insulated casings (which may be ordinary casings) 4 and 4a penetrate into the well drilling holes 1 and 1b up to the hole bottom 1a.
A screen 1 fitted with a slit at the lower end
The upper casing 4a is provided with full-hole cement 2 between the upper casing 4a and the inner wall of the well drilling hole 1b to prevent spring water from flowing from the inner wall of the well drilling hole 1b. As before, 3a is a packer, which is filled between the lower end of the upper casing 4a and the upper end of the casing 4 (lower side) to prevent spring water from entering from the inlet 4b at the upper end of the casing 4, A cement packer 5 is installed at a lower portion of the casing 4, and the spring water from the well drilling hole 1 flows down the outside of the casing 4 and flows down to the screen 10 b
The temperature of the pumping water does not drop from the water.

The configuration of the present invention is different from the conventional one in that an insulated auxiliary casing 14a (which may be a normal casing) having a predetermined depth from the ground entrance is inserted thereinto, and a bottom surface of the auxiliary casing 14a is inserted. The insulated pumping water suction pipe 8a is suspended, and the submersible pump 8 is placed in an auxiliary casing 14a instead of the conventional housing 14 (FIG. 5). The auxiliary casing 14a has an open top surface and a bottom surface. In another embodiment (FIG. 2), a packer 14b is disposed below the bottom surface of the auxiliary casing, and penetrates the auxiliary casing 14a and the packer 14b. An insulated hot water suction pipe 8a is suspended.

With this configuration, the load applied to the hot water push-up tube 8b is reduced. Also, the gas in the hot spring water rises into the auxiliary casing 14a whose upper surface is open and is discharged to the ground.

Hot water suction pipe 8a and / or hot water push-up pipe 8
In some cases, only the high temperature range near the hole bottom 1a in the lower part of b is formed by a normal pipe other than the insulated double pipe. Also,
When hot water is high even in the auxiliary casing and the hot water push-up pipe, it may be formed of a normal pipe other than the double pipe. In the present invention, the ordinary pipe refers to a BP pipe (polybutene pipe), a PE pipe, a stainless steel pipe, a steel pipe, a copper pipe, or the like. In this case, since the temperature is high, the heat hardly escapes.

As shown in FIGS. 3 and 4, the insulated double pipe has a structure in which a heat insulating material 20 is filled between an outer pipe 22a and an inner pipe 22b, and the gap is evacuated or an inert gas is filled. It is. The joint has a structure that can be easily connected and detached by the coupling 21 with a screw joint. Both ends of the outer tube 22a and the inner tube 22b are screwed to each other to seal both ends of the gap of the heat insulating material 20 (FIG. 3A,
FIG. 4A shows that the seal ring 2 is provided during the screw connection.
3 may be inserted to reinforce the sealed state (FIG. 3 (b), FIG. 4 (b)). The seal ring 23 is particularly effective when the outer tube 22a is made of steel and the inner tube 22b is made of resin.

[0029] The insulated double pipes are casings 4, 4a,
Used for the auxiliary casing 14a and / or the hot water suction pipe 8a and the hot water push-up pipe 8b, the outer pipe 22a is made of steel, and the inner pipe is made of resin or stainless steel to improve corrosion resistance. When the pipe is made of steel, the inner wall of the inner pipe is lined with a resin pipe or coated with a corrosion resistant material 4c made of resin. If the outer wall surface of the outer tube is also required to have corrosion resistance, the same measures are taken as for the inner tube.

Casing 4, 4a and auxiliary casing 1
In the case of 4a, corrosion is unlikely to occur because the flow velocity is not large as in a hot water pipe. However, if the corrosive substance is contained at a high temperature, the flow velocity of the threaded joint fluctuates. May occur in a short time. The thread shape of the steel pipe is usually a round or square thread specified by the API standard, which is inexpensive and versatile,
A step may occur between the screw and the coupling, causing flow velocity fluctuations. To prevent this, a special screw (for example, a premium joint) may be cut. Had difficulties. Therefore, as shown in FIG. 3 and FIG.
By inserting a pad 19 made of resin (for example, polyurethane) having excellent corrosion resistance, the step is eliminated and corrosion is prevented. The pad 19 is dimensioned to be self-tightening when the pipe screw is tightened, and is designed so as not to fall off.

[0031]

According to the present invention described in detail above, the following effects can be obtained. (1) During maintenance, inspection, and repair of the submersible pump, only the raising and lowering pipe and the submersible pump are merely raised to the ground, so that the weight can be reduced and a large crane is not required, and the number of working days is reduced. I'm done.

(2) There is no need for a hermetically sealed housing as in the prior art, and there is no danger of cold water entering the housing.

(3) Even if gas is generated from the well, it is discharged to the ground because the upper surface of the auxiliary casing is open,
Does not lower the performance of the submersible pump.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an embodiment of the present invention.

FIG. 2 is a sectional view illustrating another embodiment of the present invention.

FIGS. 3A and 3B are partial cross-sectional views of a casing and an auxiliary casing of the present invention and a joint portion thereof, wherein FIG. 3A shows a case without a seal ring, and FIG.

FIGS. 4A and 4B are partial cross-sectional views of a hot-water pipe (a hot-water push-up pipe and a hot-water suction pipe) of the present invention and a joint thereof, where (a) has no seal ring and (b) has a seal ring. Is the case.

FIG. 5 is an explanatory diagram of a conventional hot-water hot-water pumping method.

[Explanation of symbols]

 1, 1b Well drilling hole 1a Hole bottom 4, 4a Casing 4c Coating 8 Submersible pump 8a Lifting water suction pipe (lifting pipe) 8b Lifting water push-up pipe (lifting pipe) 13 Hot water tank 14a Auxiliary casing 14b Packer 19 Pad 20 Thermal insulation Material 21 Coupling 22a Outer tube 22b Inner tube 23 Seal ring

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Fumiaki Ichino 512-11, Ichigao-cho, Aoba-ku, Yokohama-shi, Kanagawa-ken (72) Inventor Yutaka Hirano 3-8 Hyuga-cho, Mizuho-ku, Nagoya-shi, Aichi (72 ) Inventor Masayuki Tsuji 1-9-10, Kiyoshiro-cho, Handa-shi, Aichi (56) References JP-A-9-317371 (JP, A) Registered utility model 3031889 (JP, U) (58) Fields investigated (Int) .Cl. ⁷ , DB name) E21B 43/00 E03B 3/08 E03B 5/04

Claims (9)

(57) [Claims] 1. A casing or an insulated casing is penetrated and loaded into a well borehole to the bottom of the well, and an auxiliary casing having a bottom surface opened at the top or an insulated bottom surface opened at the top of the casing is opened at the top of the casing. A submersible pump is disposed at the bottom of the auxiliary casing, and a submersible pump is disposed at the bottom of the auxiliary casing. The hot water riser pipe is piped to a hot water storage tank on the ground, and high-temperature water flowing from the bottom of the well is sucked by the submersible pump through the hot water suction pipe and the auxiliary casing, and the hot water riser pipe passes through the hot water riser pipe to the hot water storage tank. A hot-spring hot water method characterized by supplying. 2. A casing or an insulated casing is penetrated into the well drilling hole and charged to the bottom of the hole, and an auxiliary casing having an open top surface and a bottom surface is provided on the upper portion of the casing.
Alternatively, an auxiliary casing which is insulated and has a bottom surface with an open top surface is inserted, a packer is disposed below the bottom surface of the auxiliary casing, and the insulated hot water suction pipe penetrating through the bottom surface of the auxiliary casing and the packer is holed. A submersible pump is arranged at the bottom in the auxiliary casing, and a hot water riser pipe insulated from this submersible pump is piped to a hot water storage tank on the ground, and the high-temperature water flowing from the bottom of the well is discharged from the submersible pump. A hot-water pumping method for a hot spring, characterized in that the water is sucked by the submersible pump through a hot-water suction pipe and an auxiliary casing, and supplied to the hot-water storage tank through the hot-water push-up pipe. 3. The casing, the auxiliary casing and / or
In addition, in order to improve heat insulation and corrosion resistance, the outer pipe is made of steel or resin, and the inner pipe is a double pipe made of resin, with a heat insulating material inserted between them. 3. The method of claim 1, wherein a vacuum or an inert gas is sealed afterwards. 4. The casing, the auxiliary casing and / or
Or, the hot water pipe consisting of suction and push-up is a double pipe consisting of inner and outer pipes of steel pipe, after which a heat insulating material is inserted between them, vacuum or inert gas is sealed, and both outer pipe outer wall and inner pipe inner wall 3. The method of claim 1 or 2, wherein one of the two is lined with a resin pipe or coated with a corrosion-resistant material made of resin. 5. The casing, the auxiliary casing and / or
Or, to improve the heat insulation and corrosion resistance, the outer pipe is a double pipe made of steel or stainless steel and the inner pipe is made of stainless steel. 3. The hot-spring method of a hot spring according to claim 1, wherein the hot spring is sealed. 6. The hot-water pumping method for a hot spring according to claim 5, wherein at least one of the outer tube and the inner tube has a stainless plate attached to an outer surface of the outer tube and a stainless plate attached to the inner surface of the inner tube. . 7. In the lower part of the suction pipe and / or the push-up pipe between the hot water, only the high temperature range near the bottom of the hole is formed by a normal pipe other than the insulated double pipe. The hot-water hot-water method according to claim 1 or 2, wherein 8. The connection of the double pipe is connected to a threaded joint portion with a pad for preventing corrosion and flow fluctuation,
The hot-water hot-water pumping method according to any one of claims 3 to 6, wherein an inner surface of the joint portion is formed flat. 9. The double pipe according to claim 3, wherein the inner pipe and the outer pipe are hermetically sealed by screw connections incorporating seal rings at both ends. Hot spring method of hot spring.