阅读说明：本技术 一种地热单井加压回灌装置及方法 (Geothermal single-well pressurizing and recharging device and method ) 是由 秦光雄 陈惠娟 雷玉德 袁有靖 董高峰 于 2021-07-29 设计创作，主要内容包括：本发明公开了一种地热单井加压回灌装置及方法,地热单井加压回灌装置,包括水泵,水泵与旋流除砂器连接,旋流除砂器与水箱一和水箱二依次连接,水箱一通过若干预处理泵与可反冲洗的过滤砂缸连接,过滤砂缸与水箱二连接,水箱二和回灌增压泵一连接,回灌增压泵一与过滤器一、过滤器二、排气罐和综合水处理仪依次连接,综合水处理仪与回灌增压泵二连接,回灌增压泵二另一端设置在回灌井内,地热单井加压回灌装置还包括控制装置。本发明还包括采用上述的地热单井加压回灌装置进行地热单井回灌的方法。本发明可以大大减少经费,达到探测地热储层回灌能力的要求,有效解决了现有技术中热田使用寿命缩短和供热尾水排放污染环境等问题。(The geothermal single-well pressurizing and recharging device comprises a water pump, wherein the water pump is connected with a rotational flow desander, the rotational flow desander is sequentially connected with a water tank I and a water tank II, the water tank I is connected with a filtering sand cylinder capable of back flushing through a treatment pump if the treatment pump is intervened, the filtering sand cylinder is connected with the water tank II, the water tank II is connected with a recharging booster pump I, the recharging booster pump I is sequentially connected with a filter I, a filter II, an exhaust tank and a comprehensive water treatment instrument, the comprehensive water treatment instrument is connected with the recharging booster pump II, the other end of the recharging booster pump II is arranged in a recharging well, and the geothermal single-well pressurizing and recharging device further comprises a control device. The invention also discloses a method for recharging the geothermal single well by adopting the geothermal single well pressurizing recharging device. The invention can greatly reduce the expenditure, meet the requirement of detecting the recharge capability of the geothermal reservoir and effectively solve the problems of shortened service life of the hot field, environmental pollution caused by the discharge of the tail water of heat supply and the like in the prior art.)

1. The geothermal single-well pressurizing and recharging device is characterized by comprising a water pump, wherein the water pump is arranged in a recharging well, the water pump is connected with a cyclone desander, the cyclone desander is sequentially connected with a water tank I and a water tank II, the water tank I is connected with a filtering sand cylinder capable of backwashing through an intervention treatment pump, the filtering sand cylinder is connected with the water tank II, the water tank II is connected with a recharging booster pump I, the recharging booster pump I is sequentially connected with a filter I, a filter II, an exhaust tank and a comprehensive water treatment instrument, the comprehensive water treatment instrument is connected with the recharging booster pump II, the other end of the recharging booster pump II is arranged in the recharging well, valves are arranged between adjacent components, the geothermal single-well pressurizing and recharging device further comprises a control device, and the water pump, the cyclone desander, the recharging booster pump I, the filter I, the recharging booster pump II, The filter II, the comprehensive water treatment instrument, the recharge booster pump II and the valve are all connected with the control device.

2. The geothermal single-well pressurizing and recharging device as defined in claim 1, wherein the geothermal single-well pressurizing and recharging device is further provided with a pressure alarm device.

3. The geothermal single-well pressurizing and recharging device as defined in claim 1, wherein a plurality of water temperature sensors and liquid level sensors are arranged in the first water tank and the second water tank, and the water temperature sensors and the liquid level sensors are connected with the control device.

4. The geothermal single-well pressurizing recharge device of claim 1, wherein a water level gauge is disposed in the recharge well.

5. The geothermal single-well pressurizing and recharging device of claim 1, wherein the control device is a PLC controller.

6. The geothermal single-well pressurizing recharging device as defined in claim 1, wherein electromagnetic flow meters are arranged between the cyclone desander and the first water tank and between the comprehensive water treatment instrument and the second recharging booster pump.

7. The geothermal single-well pressurizing recharge device of claim 1, wherein said first filter and said second filter are respectively a coarse filter and a fine filter, and respectively employ PP melt-blown filter elements of 50 μm and 5 μm.

8. A method of geothermal single well recharge using the geothermal single well pressurized recharge device of any one of claims 1 to 7, comprising the steps of:

(1) closing the water outlet end of the water tank II, the first recharging booster pump and the second recharging booster pump, opening the first water tank and the second water tank, starting the water pump to store water, starting the pretreatment pump and the sand filtering cylinder to adjust water into the second water tank when the water level of the second water tank exceeds two thirds of the height of the first water tank, closing the water pump and the pretreatment pump when the water level of the second water tank exceeds a preset water level, and naturally cooling the water in the first water tank and the second water tank for 10-12 hours for standby;

(2) and checking the sealing effect of the device, closing the inlet end of the first water tank, treating the water in the second water tank by a first recharge booster pump, a first filter, a second filter, an exhaust tank and a comprehensive water treatment instrument in sequence, and finally pressurizing by a second recharge booster pump and then filling the water into a recharge well.

9. The method for geothermal recharging a single well according to claim 8, wherein in the step (2), recharging operations with recharging pressures of 0.20, 0.50, 0.60, 0.70, 0.80 and 0.90Mpa are simultaneously set, the water level, temperature and pressure of the recharging well are recorded, the observation intervals of the recharging flow and the water temperature are 1, 2, 5, 10, 20 and 30, the unit is min, and the observation intervals can be 1 hour and 1 time after the water level is relatively stable until the recharging is finished.

Technical Field

The invention belongs to the technical field of geothermal well recharging, and particularly relates to a geothermal single well pressurizing recharging device and method.

Background

Geothermal recharging not only recovers and processes heat supply cycle tail water and reduces discharge, but also has more important significance in that low-temperature fluid filled into a reservoir can obtain heat energy from a rock framework, increase heat storage pressure and achieve the purpose of recycling geothermal resources. Effective recharge has very important significance for prolonging the service life of a hot field, reducing the discharge of heat supply tail water, polluting the environment and preventing ground settlement caused by mining. At present, the recharging type exploitation of geothermal resources is commonly recognized, and some countries take recharging as an important component of geothermal exploration and development and geothermal resource management. At present, single-well recharge test researches are few, the recharge capability of the geothermal field is researched by utilizing the existing geothermal well to carry out the single-well recharge test, and the study has great reference significance for the recharge capability of the geothermal field, wherein the existing geothermal well is far away from the geothermal well and has no fund to construct a new well to detect the geothermal field.

Disclosure of Invention

Aiming at the defects, the invention provides the geothermal single-well pressurizing recharging device and the method, which can realize the recharging of the recharging well and the recovery well in the same well, greatly reduce the expenditure, meet the requirement of detecting the recharging capability of the geothermal reservoir and effectively solve the problems of shortened service life of the hot field, environment pollution caused by the discharge of heat supply tail water and the like in the prior art.

In order to achieve the purpose, the technical scheme adopted by the invention for solving the technical problems is as follows: the geothermal single-well pressurizing and recharging device comprises a water pump, wherein the water pump is arranged in a recharging well, the water pump is connected with a rotational flow desander, the rotational flow desander is sequentially connected with a water tank I and a water tank II, the water tank I is connected with a filtering sand cylinder capable of back flushing through an intervention treatment pump, the filtering sand cylinder is connected with the water tank II, the water tank II is connected with a recharging booster pump I, the recharging booster pump I is sequentially connected with a filter I, a filter II, an exhaust tank and a comprehensive water treatment instrument, the comprehensive water treatment instrument is connected with the recharging booster pump II, the other end of the recharging booster pump II is arranged in the recharging well, valves are arranged between adjacent components, the geothermal single-well pressurizing and recharging device further comprises a control device, and the water pump, the rotational flow desander, the recharging booster pump I, the filter II, the comprehensive water treatment instrument, the recharging booster pump II and the valves are all connected with the control device.

Furthermore, the geothermal single-well pressurizing and recharging device is also provided with a pressure alarm device.

The beneficial effect of adopting the further scheme is that: the device is designed for realizing unattended operation of the recharging equipment, the recharging flow is gradually reduced along with the time, the recharging pressure is gradually increased, and when the pressure reaches a certain limit value, the recharging well is protected from being damaged and the situation that the recharging pressure is too high is prompted. When the recharging pressure rises to a certain limit, an alarm device is triggered to remind the inspection equipment.

Furthermore, a plurality of water temperature sensors and liquid level sensors are arranged in the first water tank and the second water tank, and the water temperature sensors and the liquid level sensors are connected with the control device.

Further, a water level meter is arranged in the recharge well.

Further, the control device is a PLC controller.

Furthermore, electromagnetic flow meters are arranged between the cyclone sand remover and the water tank I and between the comprehensive water treatment instrument and the recharge booster pump II.

The beneficial effect of adopting the further scheme is that: measuring the recharge flow of the geothermal water, not only displaying the instantaneous recharge flow in real time, but also displaying the accumulated recharge flow; the flow feedback signal can be used for controlling the working frequency of the recharging pressurization pump, so that the recharging operation states under different flow rates can be tested conveniently.

Furthermore, the first filter and the second filter are respectively a coarse filter and a fine filter, and PP melt-blown filter elements with the particle size of 50 micrometers and PP melt-blown filter elements with the particle size of 5 micrometers are respectively adopted.

The method for recharging the geothermal single well by adopting the geothermal single well pressurizing recharging device comprises the following steps:

(1) closing the water outlet end of the water tank II, the first recharging booster pump and the second recharging booster pump, opening the first water tank and the second water tank, starting the water pump to store water, starting the pretreatment pump and the sand filtering cylinder to adjust water into the second water tank when the water level of the second water tank exceeds two thirds of the height of the first water tank, closing the water pump and the pretreatment pump when the water level of the second water tank exceeds a preset water level, and naturally cooling the water in the first water tank and the second water tank for 10-12 hours for standby;

(2) and checking the sealing effect of the device, closing the inlet end of the first water tank, treating the water in the second water tank by a first recharge booster pump, a first filter, a second filter, an exhaust tank and a comprehensive water treatment instrument in sequence, and finally pressurizing by a second recharge booster pump and then filling the water into a recharge well.

Further, in the step (2), recharging operations with recharging pressures of 0.20, 0.50, 0.60, 0.70, 0.80 and 0.90Mpa are simultaneously set, the water level, the temperature and the pressure of the recharging well are recorded, the observation intervals of the recharging flow and the water temperature are 1, 2, 5, 10, 20 and 30, the unit is min, and the observation intervals can be 1 hour and 1 time after the water level is relatively stable until recharging is finished.

In summary, the invention has the following advantages:

1. the geothermal single-well pressurizing recharging device and the geothermal single-well pressurizing recharging method provided by the invention can realize the recharging of the recharging well and the exploitation well in the same well, can greatly reduce the expenditure, meet the requirement of detecting the recharging capability of a geothermal reservoir, and effectively solve the problems of shortened service life of a hot field, environment pollution caused by the discharge of heat supply tail water and the like in the prior art.

2. The invention mainly aims at areas with low recharge research degree, low test expenditure and ready geothermal holes. The single-hole test can meet the requirement for construction of geothermal holes at a glance, and meanwhile, the test work can be carried out by means of the existing drill holes, so that the expenditure can be greatly reduced, and the requirement for detecting the recharge capability of the geothermal reservoir can be met.

Drawings

FIG. 1 is a schematic diagram of a geothermal single well pressurized recharge device;

wherein, 1, a water pump; 2. a cyclone desander; 3. an electromagnetic flow meter; 4. a pretreatment pump; 5. a first water tank; 6. a sand filtering cylinder; 7. a second water tank; 8. recharging the first booster pump; 9. a first filter; 10. a second filter; 11. an exhaust tank; 12. a comprehensive water treatment instrument; 13. a control device; 14. and a second recharging booster pump.

Detailed Description

The following detailed description of embodiments of the invention refers to the accompanying drawings.

In one embodiment of the invention, as shown in fig. 1, a geothermal single-well pressurizing and recharging device is provided, which comprises a water pump 1, wherein the water pump 1 is arranged in a recharging well, the water pump 1 is connected with a rotational flow desander 2, the rotational flow desander 2 is sequentially connected with a first water tank 5 and a second water tank 7, the first water tank 5 is connected with a backwashing filtering sand cylinder 6 through a treatment intervention pump 4, the filtering sand cylinder 6 is connected with the second water tank 7, the second water tank 7 is connected with a recharging booster pump I8, the recharging booster pump I8 is sequentially connected with a first filter 9, a second filter 10, an exhaust tank 11 and a comprehensive water treatment instrument 12, the comprehensive water treatment instrument 12 is connected with a recharging booster pump II 14, the other end of the recharging pump II 14 is arranged in the recharging well, valves are arranged between adjacent components, the geothermal single-well pressurizing and recharging device further comprises a control device 13, and the water pump 1, the desander 2, the recharging booster pump I8, the air exhaust tank 11 and the comprehensive water treatment instrument 12 are sequentially connected with the comprehensive water treatment instrument 12, the recharging booster pump II 14, the control device 13, The first filter 9, the second filter 10, the comprehensive water treatment instrument 12, the second recharge booster pump 14 and the valve are all connected with a control device 13; a plurality of water temperature sensors and liquid level sensors are arranged in the first water tank 5 and the second water tank 7, and the water temperature sensors and the liquid level sensors are connected with the control device 13.

The geothermal single-well pressurizing and recharging device is also provided with a pressure alarm device; the device is designed for realizing unattended operation of the recharging equipment, the recharging flow is gradually reduced along with the time, the recharging pressure is gradually increased, and when the pressure reaches a certain limit value, the recharging well is protected from being damaged and the situation that the recharging pressure is too high is prompted. When the recharging pressure rises to a certain limit, an alarm device is triggered to remind the inspection equipment. The control device 13 is a Siemens PLC controller, and a Kunlun touch screen is used for displaying the liquid level of a deep well, the water outlet pressure, the water outlet temperature, the filter pressure, the recharge pressure and the recharge flow rate (three thousandths of the error of the liquid level of the deep well, the precision of the water outlet temperature is 0.5 ℃, the pressure precision is 0.05Mpa, the flow precision is 0.5 percent, the flow pressure is unstable during recharge, and the transient flow pressure fluctuation is a normal phenomenon), so that a data curve report and a digital report are realized, the data can be visually observed in real time, the recharge flow rate and recharge pressure curve are analyzed, data support is provided for stable operation of equipment, the data can be stored for one year, and an alarm device is designed, and when the recharge pressure and the flow rate exceed limit values, the equipment automatically alarms to remind the user of processing. The control device 13 is designed for constant pressure and constant flow control, so that energy-saving operation of the equipment is realized, and power consumption is reduced. Electromagnetic flow meters 3 are arranged between the cyclone desander 2 and the water tank I5 and between the comprehensive water treatment instrument 12 and the recharge booster pump II 14; measuring the recharge flow of the geothermal water, not only displaying the instantaneous recharge flow in real time, but also displaying the accumulated recharge flow; the flow feedback signal can be used for controlling the working frequency of the recharging pressurization pump, so that the recharging operation states under different flow rates can be tested conveniently.

More specifically, the water pump 1 has the model number of 250QJR80-270, the caliber of 250mm, the design lift of 270m and the design water inflow of 80m³H is used as the reference value. 1000m (75 mm) matched cable²) Pump tube 240m (4 inches), deep well pump control cabinet (LSDRK-B-110/1). The deep well pump pumps geothermal water from the geothermal well for production and living use. The temperature and pressure display is arranged at the water outlet, and the temperature and pressure state of the outlet water of the geothermal water can be visually displayed. The cyclone sand remover 2 is DN150 and has the function of removing gravel and suspended matters with density larger than that of water in geothermal water. The comprehensive water treatment instrument has the model number of 12 DN150 and the filtering capacity of more than or equal to 80m³And h, the scale problem in a water system can be reduced. The electromagnetic field and the ultrasonic wave are generated to act on the pipeline of the water system, so that water molecules in the pipeline generate resonance, the water scale in the system is removed, the hydration capability of the water molecules on scale forming components such as calcium, magnesium ions, carbonate ions and the like is improved, and the effect of preventing the formation of the water scale is achieved. Meanwhile, under the action of electromagnetic field and ultrasonic wave, the original scale crystals gradually become soft, fall off and dissolve, thereby achieving the purpose of preventing and removing scale.

The first water tank 5 and the second water tank 7 are formed by combining galvanized 0.5m multiplied by 0.5m panels, and the volumes are respectively 62.5m³And 127.5m³General, ofProduct of 200m³Using a volume of 175m³. The geothermal water storage tank is replaced by a reservoir to store geothermal water, so that conditions are conveniently provided for the recharge test at different temperatures. The model of the pretreatment pump 4 is ISG100-160A/2/11, the number of the pretreatment pumps is two, geothermal water in the water tank is pumped into the sand filtering cylinder 6, and the sand filtering cylinder has a back flushing function, so that the filtering performance of the sand filtering cylinder 6 is improved, and the service life of the sand filtering cylinder is prolonged. The 6-caliber of the filtering sand cylinder is phi 2000mm, and can filter and remove Fe in geothermal water³⁺And oxides thereof, prevent clogging of recharging equipment. The model of the first recharging booster pump 1 and the model of the second recharging booster pump 14 are ISG100-200A/2/18.5, the number of the first recharging booster pump and the second recharging booster pump is 2, pressure is provided for geothermal water recharging, and recharging states under different flow rates and different pressures can be tested conveniently.

The first filter 9 and the second filter 10 are respectively a coarse filter and a fine filter, the calibers of which are phi 800mm, and are produced by the Texas electric automation equipment Co. The filter element is respectively used for melt-blowing the filter elements with the diameter of 50 mu m and 5 mu mPP, has the characteristics of high efficiency, large filter area, low pressure difference and the like, can effectively remove impurities such as suspended matters, particles and the like with the diameter of more than 5 mu m in liquid, and reduces the pollution and blockage to the geothermal well perforated pipe. Generally, the filter element is replaced once in 60 days (the filter element is specifically judged according to the impurity content in water and a pressure gauge of the filter), and the replacement is convenient and fast. The pressure gauges are arranged on the water inlet and outlet of the coarse filter and the fine filter, and the condition of filter element fouling and blocking can be visually judged through the pressure difference. The 11-caliber phi 600mm of the exhaust tank can exhaust excessive residual gas in the recharge water.

The geothermal single-well pressurizing and recharging device is already applied to a single-well pressurizing and recharging test of a number DR2018 geothermal well in the Xining area.

The method for recharging the geothermal single well by adopting the geothermal single well pressurizing recharging device comprises the following steps:

(1) closing the water outlet end of the water tank II, the first recharging booster pump and the second recharging booster pump, opening the first water tank and the second water tank, starting the water pump to store water, starting the pretreatment pump and the sand filtering cylinder to adjust water into the second water tank when the water level of the second water tank exceeds two thirds of the height of the first water tank, closing the water pump and the pretreatment pump when the water level of the second water tank exceeds a preset water level, and naturally cooling the water in the first water tank and the second water tank for 10-12 hours for standby;

(2) and checking the sealing effect of the device, closing the inlet end of the first water tank, treating the water in the second water tank by a first recharge booster pump, a first filter, a second filter, an exhaust tank and a comprehensive water treatment instrument in sequence, and finally pressurizing by a second recharge booster pump and then filling the water into a recharge well. And meanwhile, setting the recharging pressure of 0.20, 0.50, 0.60, 0.70, 0.80 and 0.90Mpa for recharging operation, recording the water level, the temperature and the pressure of the recharging well, and observing the recharging flow and the water temperature at intervals of 1, 2, 5, 10, 20 and 30 in unit of min, wherein the observation intervals can be 1 hour and 1 time after the water level is relatively stable until recharging is finished.

While the present invention has been described in detail with reference to the illustrated embodiments, it should not be construed as limited to the scope of the present patent. Various modifications and changes may be made by those skilled in the art without inventive step within the scope of the appended claims.