JPS6022158Y2 - Hydrothermal surface position measurement device in geothermal steam extraction well - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a device for measuring the position of a hot water surface in a geothermal steam extraction well, and its object is to provide a highly accurate device that can directly measure the position of a hot water surface with a simple device.

Being able to know in advance the amount of steam to be extracted from a geothermal steam extraction valve (hereinafter referred to as a geothermal steam well) used for geothermal power generation is extremely important for determining the power generation capacity of geothermal power generation.

In addition, the hot water surface during geothermal steam erupting inside a well changes depending on the amount of extracted steam, and measuring the position of this hot water surface is important for understanding the well capacity and proper well management.

Conventionally, the position of the hot water surface during eruption from a geothermal steam well has been calculated indirectly using ground measurements, but it is difficult to directly measure the position of the hot water surface.

In other words, hot water is boiling at the hot water surface, and as a result, there is a two-phase state in which steam and hot water are mixed near the hot water surface, making it extremely difficult to directly measure the location of the hot water surface inside a geothermal steam well. Have difficulty.

The present invention is a device that can accurately measure the position of the hot water surface in a geothermal steam well by capturing changes in the physical properties of steam and hot water using a simple device, by having the configuration described in the claims of the utility model registration. I got it.

FIG. 1 shows an example of a steam/water separator used in the device according to the present invention. A separating plate 4 is attached which is formed in a helical shape and has a defect near the axis of the outer cylinder 2 to form a hollow portion.

The edge of the separation plate 4 on the center side of the outer cylinder 2 is attached with a slight downward inclination.

In addition, a plurality of drainage holes 5 are provided in the outer cylinder 2 along the lower edge of the separation plate 4 in the uppermost helical portion of the separation plate 4.
On the other hand, a guide plate 6 formed in the shape of an inverted cone is attached to the lower central portion of the outer cylinder 2.

The steam/water separator 1 used in the present invention has the above-described structure, and when a mixed flow of steam and hot water enters from the bottom as shown by the arrow in FIG. is sprayed onto the inner circumferential surface 3 of the outer cylinder 2.

At this time, the hot water is blocked by the separation plate 4 and rises in a spiral shape along the separation plate 4 in the groove 7 formed by the separation plate 4 and the inner peripheral surface 3, as indicated by the solid line arrow in FIG. , is discharged to the outside of the outer cylinder 2 through a drainage hole 5 formed in the helical lower end edge of the uppermost stage.

On the other hand, as shown by the dotted line arrow in FIG. It goes straight through the hollow part near the axis of the outer cylinder 2 and is discharged from the upper end face of the outer cylinder 2.

That is, the steam-water separator used in the present invention can easily separate steam and hot water when a mixed flow of steam and hot water is passed therethrough.

Of course, the steam/water separator used in the present invention is not limited to the structure shown in FIG. 1, but may be any structure that can separate steam and hot water in a mixed flow.

FIG. 2 shows an example of a detector used in the present invention. The detector 8 is equipped with a heater 10 made of a coiled metal resistance wire inside an outer cylinder 9. A lead wire 11 is attached to the tip of the heater 10.

An insulating tube 12 is attached to the upper part of the heater 10 and lead wire 11, and the heater 10 and the lead wire 11 are connected to an ammeter (not shown) on the ground surface through a cable 13 hanging down from the ground surface.

The above-mentioned detector 8 detects the temperature difference between steam and hot water, and when a constant current is passed through the heater 10, there is a temperature difference between the steam and the hot water. Since the resistance of the heater 10 when it is present and the resistance when immersed in hot water change suddenly, the change in resistance is converted into an electric current and detected.

As shown in FIG. 3, the device according to the present invention is one in which a detector 8 shown in FIG. is used by suspending it from the ground surface into the geothermal steam well 14 by a cable 13 and lowering it.

Next, the function and effect of the device according to the present invention will be explained. At the same time as the device according to the present invention is lowered into the geothermal steam well 14 which is being spouted, a constant current is caused to flow to the heater 10 in the detector 8.

At the initial stage when the device according to the present invention is lowered into the geothermal steam well 14, there is almost a steam flow inside the geothermal steam well 14.
The current flowing through the heater 10 remains unchanged.

As the device of the present invention continues to descend and reaches near the hot water surface, a mixed flow of steam and hot water is formed.

Here, the steam-water separator 1 works, and the hot water in the mixed flow is transferred to the outer cylinder 2.
Since only the steam is discharged from the drain hole 5 formed at the top of the heater 10 and guided into the detector 8, the current flowing inside the heater 10 is not affected by mixed current, and therefore a constant current is maintained with almost no change. has been done.

Furthermore, when the device of the present invention is lowered and immersed in hot water, the inside of the detector 8 is filled with hot water, and the external temperature of the heater 10 becomes the temperature of the hot water, causing a change in the current flowing inside the heater 10. , this is caught by an ammeter on the ground surface.

Therefore, the position of the hot water surface can be accurately measured by reading the length of the cable at the time when the current changes using the above-mentioned ammeter on the ground surface.

As described above, in the device according to the present invention, the ambiguous current change caused by the mixed flow of steam and hot water near the hot water surface is reduced to a flow of only steam using the steam separator, and the device is further submerged below the hot water surface. Sometimes it is possible to directly measure the exact hot water level by accurately converting the temperature changes associated with the temperature of the hot water into electrical signals.

FIG. 4 shows another embodiment of the detector of the device according to the present invention, in which a weight 16 is attached to the tip of a metal wire 15, and an annular electrode 17 is attached to the top of the weight 16. is attached to the outer periphery of the metal wire 25.

Note that the same reference numerals in FIG. 4 as in FIG. 2 indicate the same members.

The detector shown in FIG. 4 detects changes in capacitance between the metal wire 15 and the annular electrode 17.

That is, the capacitance between the metal wire 15 and the annular electrode 17 maintains a constant capacitance when it exists in steam, but when it is immersed in hot water, the capacitance between the metal wire 15 and the annular electrode 17 remains constant. The annular electrode 17 is short-circuited, and the capacitance becomes zero.

Therefore, the position of the hot water surface can be easily measured by detecting the change in capacitance described above.

As described above, the device according to the present invention easily separates a mixed flow of steam and hot water near the hot water surface in a geothermal steam well into steam and hot water using a steam separator, and The physical properties of the steam are detected by an electrical signal by a detector combined with the sensor, and the physical properties of the hot water are detected by an electrical signal by immersing the detector in hot water.Changes in this electrical signal Since the position of the hot water surface can be directly measured from the surface, there is an effect that the accurate position of the hot water surface can be directly measured without being affected by mixed currents.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an example of a steam/water separator of an apparatus according to the present invention, and FIG. 2 is a sectional view of an example of a detector of an apparatus according to the present invention.
Figure 3 is a schematic sectional view of an example of the use of the device according to the present invention;
The figure is a sectional view of another embodiment of the detector. 1: Steam separator, 2: Outer cylinder, 3: Inner peripheral surface of outer cylinder, 4: Separation plate, 5: Drain hole, 6: Guide plate, 8: Detector, 9: Outer cylinder,
10: Heater, 1 wire, 12: Insulated tube, 13: Cable, steam well, 15: Metal wire, 16: Weight, electrode. 1: Lead 14: Geothermal 17: Annular

Claims (1)

[Scope of utility model registration request] A detector that converts changes in the physical properties of steam and hot water into electrical signals is installed in the steam passage above the steam separator that separates steam and hot water near the hot water surface in a geothermal steam extraction well. A device for measuring the position of a hot water surface in a geothermal steam collection well, characterized in that when the detector is immersed in hot water, the position of the hot water surface can be detected from a change in the electrical signal.