A geothermal well productivity testing device and productivity calculation method

Abstract

The present invention relates to the field of geothermal capacity testing technology, and discloses a geothermal well capacity testing device and a capacity calculation method. The capacity testing device of the present invention includes a gas-liquid separation device, a first condensing device, a cooling device, and a humidity sensor. The geothermal fluid is preliminarily separated into geothermal gas and geothermal water by the gas-liquid separation device, and the water vapor in the geothermal gas is further condensed by a multi-stage circulating cooling device, thereby improving the accuracy of the flow data. The correlation coefficient of the enthalpy calculation is fitted by the measured data of multiple sensors and flow meters, and the heat flow calculation formula is combined to calculate the heat flow of geothermal water and geothermal steam respectively, thereby obtaining the total capacity of the geothermal well. This effectively solves the problems of low calculation accuracy and complex calculation in the existing technology, and provides important technical support for the evaluation and utilization of geothermal resources.

Description

Technical Field

[0001] The present invention relates to the technical field of geothermal productivity testing, and in particular to a geothermal well productivity testing device and a productivity calculation method. Background Art

[0002] Geothermal energy, as a green, renewable, and environmentally friendly energy source, is gaining increasing attention and application worldwide. Especially in regions rich in geothermal resources, geothermal energy can be used not only for power generation but also to provide stable, low-carbon energy support for urban and industrial heating.

[0003] Geothermal energy has enormous potential. Effectively assessing the productivity of geothermal wells and rationally planning and utilizing geothermal resources are critical challenges currently in need of solutions. Before implementing effective measures to assess geothermal well productivity, it is necessary to accurately calculate the actual productivity of the wells. Existing formulas do not exist that can directly calculate geothermal well productivity. Therefore, the development of a geothermal well productivity testing device and productivity calculation method is of great significance.

[0004] The existing technologies are as follows: CN108254103A, this invention application discloses a geothermal well productivity testing device and its testing method, which mainly transfers the heat of geothermal water extracted from the well to external input cold water through a heat exchanger, and calculates the productivity by the temperature difference before and after the cold water absorbs heat. CN115541062A, this invention application discloses a mixed water gas-liquid two-phase geothermal well productivity testing device, which directly mixes the collected geothermal water with cold water to achieve a cooling effect. CN112031751B, this invention patent discloses a bypass type gas-liquid separation geothermal productivity testing system, which diverts a part of the collected geothermal fluid, performs gas-liquid separation and cooling on the diverted geothermal fluid, and calculates the proportion of geothermal water, geothermal water vapor and non-condensable gas in the separated geothermal fluid.

[0005] Currently, the existing production capacity calculation formula has the following problems when calculating the production capacity of high-temperature geothermal wells: ① There is no complete formula for calculating geothermal well production capacity, and calculations require looking up tables and comparing various parameters, which is cumbersome and inefficient; ② There is no systematic device to fully separate the gas and water in the geothermal fluid during calculations, resulting in errors in the calculation results.

[0006] In summary, there is an urgent need for a device and a method for calculating geothermal well productivity that can accurately and efficiently perform geothermal well productivity testing to solve the problems existing in the prior art. Summary of the Invention

[0007] The present invention aims to provide a device and a method for calculating geothermal well productivity that can accurately and efficiently test the productivity of geothermal wells. The specific technical solutions are as follows:

[0008] A geothermal well productivity testing device comprises a gas-liquid separation device, a first condensing device, a cooling device and a humidity sensor;

[0009] The inlet of the gas-liquid separation device is connected to the outlet of the geothermal well through a first pipeline; the liquid outlet of the gas-liquid separation device is connected to the reinjection well through a second pipeline, and the second pipeline is provided with a second temperature sensor, a second pressure sensor and a first flow meter; the gas outlet of the gas-liquid separation device is connected to the inlet of the first condensing device through a third pipeline, and the third pipeline is provided with a third temperature sensor and a third pressure sensor;

[0010] The condensate outlet of the first condensing device is connected to the recharge well through a fourth pipe, and a third flow meter is provided on the fourth pipe; the coolant outlet of the first condensing device is connected to the inlet of the cooling device through a fifth pipe, and the outlet of the cooling device is connected to the coolant inlet of the first condensing device through a sixth pipe.

[0011] The geothermal well productivity testing device of the present invention includes a gas-liquid separation device, a first condensing device, a cooling device and a humidity sensor. It can separate the gas source of the geothermal well into geothermal steam and geothermal water, and ensure the cooling degree of the geothermal gas by determining the humidity of the geothermal steam, thereby realizing high-precision and rapid testing of the geothermal well productivity.

[0012] Preferably, it also includes a second condensing device; the gas outlet of the first condensing device is connected to the inlet of the second condensing device, and a humidity sensor is provided on the pipe connecting the gas outlet of the first condensing device and the inlet of the second condensing device; the condensed water outlet of the second condensing device is connected to the fourth pipe through the ninth pipe, and a third flow meter is provided between the intersection of the fourth pipe and the ninth pipe and the reinjection well; the coolant outlet of the second condensing device is connected to the inlet of the cooling device through the tenth pipe, and the outlet of the cooling device is connected to the coolant inlet of the second condensing device through the eleventh pipe; the gas outlet of the second condensing device is connected to the outside atmosphere through the twelfth pipe; and the eleventh pipe and the sixth pipe are both provided with pressure pumps.

[0013] The design of the second condensing device in the present invention facilitates further separation of the geothermal water that is not completely separated in the first condensing device, thereby ensuring the accuracy of the geothermal well productivity test.

[0014] Preferably, it also includes a control valve; the gas outlet of the first condensing device is connected to the control valve through a seventh pipe, and a humidity sensor is provided on the seventh pipe; one end of the control valve is connected to the outside atmosphere through a pipe, and the other end is connected to the inlet of the second condensing device through an eighth pipe.

[0015] The design of the control valve of the present invention facilitates direct discharge of geothermal steam that meets the requirements, while geothermal steam that does not meet the humidity requirements is introduced into the second condensing device for further cooling treatment, which is easy to operate.

[0016] The present invention also discloses a method for calculating geothermal well productivity, which uses the above-mentioned geothermal well productivity testing device to obtain the geothermal well productivity, and specifically includes the following steps:

[0017] Step 1: Obtain measured data from the second temperature sensor, the second pressure sensor, the first flow meter, the third temperature sensor, the third pressure sensor, and the third flow meter;

[0018] Step 2: The geothermal water heat flow Q is obtained by combining the measured data of the second temperature sensor, the second pressure sensor and the first flow meter with the geothermal water heat flow calculation formula after pressure correction. s2 :

[0019]

[0020] Where: W s is the mass flow rate of geothermal water, measured by the first flow meter (W1); T s is the actual temperature of the geothermal water, measured by the second temperature sensor (T2); s is the actual pressure of the geothermal water, measured by the second pressure sensor (P2); R is the specific gas constant of water; s1 is a constant, whose value is determined according to get, Represents the symbol for rounding up, T smax and T smin The maximum and minimum temperatures of the geothermal water measured by the second temperature sensor (T2) in one day; τ1 = T δ1 / T s , T δ1 is the reference temperature value determined for geothermal water; X i 、Y i , Z i , A, B are known fitting coefficients;

[0021] The geothermal steam heat flow Q is obtained by combining the measured data of the third temperature sensor, the third pressure sensor and the third flow meter with the geothermal steam heat flow calculation formula after pressure correction. z2 :

[0022] Q z2 =W z {(a*ln(Q z1 +1)+bQ z1 )(0.7-P z )*10 2 +Q z1};

[0023] Where: W z is the mass flow rate of geothermal steam, measured by the third flow meter; P z is the actual pressure of geothermal steam, measured by the third pressure sensor; a and b are known fitting coefficients; Q z1 The heat flow of geothermal steam before pressure correction obtained by combining the data measured by the third temperature sensor;

[0024] Step 3: The geothermal heat flow Q obtained in step 2 s2 and geothermal steam heat flow Q z2 Get the geothermal well production capacity Q, Q = Q s2 +Q z2 .

[0025] The geothermal well productivity calculation method of the present invention obtains the measured data of the second temperature sensor, the second pressure sensor, the first flow meter, the third temperature sensor, the third pressure sensor and the third flow meter, and combines the innovative pressure-corrected geothermal water heat flow calculation formula and the pressure-corrected geothermal steam heat flow calculation formula to calculate the geothermal well productivity and quickly obtain the geothermal well productivity.

[0026] Preferably, the fitting of the coefficients in the geothermal water heat flow calculation formula after pressure correction in step 2 is obtained by the following steps:

[0027] According to the geothermal water temperature range T smin -T smax , substitute the enthalpy data corresponding to different temperatures in the water enthalpy table into the water enthalpy calculation formula:

[0028]

[0029] According to the data corresponding to the water enthalpy at different temperatures, the coefficient X is fitted. i 、Y i and Z i ;

[0030] Determine the geothermal water heat flow Q before pressure correction s1 The calculation formula is as follows:

[0031]

[0032] Combining the calculation formula of geothermal water heat flow before pressure correction and the influence of pressure on the thermal enthalpy of geothermal water, the following geothermal water heat flow after pressure correction Q is obtained s2 :

[0033]

[0034] The enthalpy data of water at different pressures in the enthalpy table are fitted to obtain the coefficients A and B.

[0035] Preferably, the fitting of the coefficients in the pressure-corrected geothermal steam heat flow calculation formula is obtained by the following steps:

[0036] According to the geothermal steam temperature range T zmin -T zmax , select the enthalpy data corresponding to the saturated steam enthalpy table and enter it into the steam enthalpy calculation formula:

[0037]

[0038] in: T z is the temperature of geothermal steam, obtained by the third temperature sensor (T3); τ2 = T δ2 / T z , T δ2 is the reference temperature value determined for geothermal steam;

[0039] According to the data corresponding to the steam enthalpy at different temperatures, the coefficient n is fitted i 、J i 、X' i 、Y' i 、Z' i ;

[0040] The calculation formula for determining the geothermal steam heat flow before pressure correction is as follows:

[0041]

[0042] Combining the calculation formula of geothermal steam heat flow before pressure correction and the effect of pressure on the thermal enthalpy of geothermal steam, the following calculation formula of geothermal steam heat flow after pressure correction is obtained:

[0043] Q z2 =W z {(a*ln(Q z1 +1)+bQ z1 )(0.7-P)*10 2 +Q z1};

[0044] The enthalpy data at different pressures in the saturated steam table are fitted to obtain the coefficients a and b.

[0045] Preferably, the geothermal steam heat flow Q is obtained z2 The process also includes judging the humidity data measured by the humidity sensor, as follows:

[0046] When the humidity data detected by the humidity sensor is greater than 0, the condensed geothermal gas is subjected to secondary condensation by the second condensing device, and the measured data of the third flow meter includes the condensed water obtained by condensation by the first condensing device and the condensed water obtained by condensation by the second condensing device;

[0047] When the humidity data detected by the humidity sensor is equal to 0, the geothermal gas condensed by the first condensing device is directly discharged, and the measured data of the third flow meter includes condensed water condensed by the first condensing device.

[0048] In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0050] Figure 1 Schematic diagram of the structure of the geothermal well productivity testing device in the preferred embodiment 1 of the present invention;

[0051] Figure 2 This is a geothermal well heat flow monitoring diagram in the preferred embodiment 1 of the present invention;

[0052] Among them, 1. geothermal well, 2. gas-liquid separation device, 3. first condensing device, 4. cooling device, 5. pressure pump, 6. humidity sensor, 7. control valve, 8. second condensing device, 9. recharge well;

[0053] G1, first pipeline, G2, second pipeline, G3, third pipeline, G4, fourth pipeline, G5, fifth pipeline, G6, sixth pipeline, G7, seventh pipeline, G8, eighth pipeline, G9, ninth pipeline, G10, tenth pipeline, G11, eleventh pipeline, G12, twelfth pipeline;

[0054] P1, first pressure sensor, P2, second pressure sensor, P3, third pressure sensor;

[0055] W1, first flow meter, W2, second flow meter, W3, third flow meter;

[0056] T1, first temperature sensor, T2, second temperature sensor, T3, third temperature sensor. DETAILED DESCRIPTION

[0057] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered by the claims.

[0058] Example:

[0059] See also Figure 1 A geothermal well productivity testing device includes a gas-liquid separation device 2, a first condensing device 3, a cooling device 4, a humidity sensor 6, a control valve 7, and a second condensing device 8. The detailed connection relationship is as follows:

[0060] The inlet of the gas-liquid separation device 2 is connected to the outlet of the geothermal well 1 through a first pipe G1. The first pipe G1 is provided with a first temperature sensor T1 and a first pressure sensor P1. The first temperature sensor T1 and the first pressure sensor P1 are mainly used to obtain the temperature and pressure of the gas-liquid mixed fluid flowing out of the geothermal well for real-time monitoring of the geothermal well.

[0061] The liquid outlet of the gas-liquid separation device 2 is connected to the recharging well 9 through a second pipeline G2. The second pipeline G2 is provided with a second temperature sensor T2, a second pressure sensor P2 and a first flow meter W1.

[0062] The gas outlet of the gas-liquid separation device 2 is connected to the inlet of the first condensing device 3 through the third pipe G3. The third pipe G3 is provided with a third temperature sensor T3, a third pressure sensor P3 and a second flow meter W2. The third temperature sensor T3, the third pressure sensor P3 and the second flow meter W2 are respectively used to monitor the temperature, pressure and flow of the geothermal gas flowing out of the geothermal well in real time.

[0063] The condensate outlet of the first condensing device 3 is connected to the recharge well 9 through the fourth pipe G4, and the fourth pipe G4 is provided with a third flow meter W3; the coolant outlet of the first condensing device 3 is connected to the inlet of the cooling device 4 through the fifth pipe G5, and the outlet of the cooling device 4 is connected to the coolant inlet of the first condensing device 3 through the sixth pipe G6.

[0064] The gas outlet of the first condensing device 3 is connected to the inlet of the second condensing device 8, and a humidity sensor 6 is installed on the pipeline connecting the gas outlet of the first condensing device 3 and the inlet of the second condensing device 8. The condensed water outlet of the second condensing device 8 is connected to the fourth pipeline G4 through a ninth pipeline G9, and a third flowmeter W3 is installed between the intersection of the fourth pipeline G4 and the ninth pipeline G9 and the recharge well 9. The coolant outlet of the second condensing device 8 is connected to the inlet of the cooling device 4 through a tenth pipeline G10, and the outlet of the cooling device 4 is connected to the coolant inlet of the second condensing device 8 through an eleventh pipeline G11. The gas outlet of the second condensing device 8 is connected to the outside atmosphere through a twelfth pipeline G12. The eleventh pipeline G11 and the sixth pipeline G6 are both equipped with a pressure pump 5. Further preferably, the gas outlet of the first condensing device 3 is connected to the control valve 7 through a seventh pipeline G7, and the seventh pipeline G7 is equipped with a humidity sensor 6. One end of the control valve 7 is connected to the outside atmosphere through a pipeline, and the other end is connected to the inlet of the second condensing device 8 through an eighth pipeline G8.

[0065] The geothermal well productivity test device of this embodiment is used to test the geothermal well productivity to obtain the geothermal well productivity. To make the result more accurate, the present invention divides the geothermal fluid into two parts: geothermal water and geothermal steam, and finally adds them together to obtain the heat flow of the geothermal well. The detailed steps are as follows:

[0066] Step 1: Obtain measured data from the second temperature sensor T2, the second pressure sensor P2, the first flow meter W1, the third temperature sensor T3, the third pressure sensor P3, and the third flow meter W3;

[0067] Step 2: The geothermal water heat flow Q is obtained by combining the measured data of the second temperature sensor T2, the second pressure sensor P2 and the first flow meter W1 with the geothermal water heat flow calculation formula after pressure correction. s2 :

[0068]

[0069] Where: W s is the mass flow rate of geothermal water, measured by the first flow meter W1, in MW; T s is the actual temperature of the geothermal water, measured by the second temperature sensor T2, in K; P s is the actual pressure of the geothermal water, measured by the second pressure sensor P2, in MPa; R is the specific gas constant of water, which is 0.461526 kJ kg -1 K -1 ; s1 is a constant, its value is based on get, Represents the symbol for rounding up, T smax and Tsmin The maximum and minimum temperatures of the geothermal water measured by the second temperature sensor T2 in one day; τ1 = T δ1 / T s , T δ1 The reference temperature value determined for geothermal water to avoid the influence of data scale differences on the results; X i 、Y i , Z i , A, B are known fitting coefficients;

[0070] The geothermal steam heat flow Q is obtained by combining the measured data of the third temperature sensor T3, the third pressure sensor P3 and the third flow meter W3 with the geothermal steam heat flow calculation formula after pressure correction. z2 :

[0071] Q z2 =W z {(a*ln(Q z1 +1)+bQ z1 )(0.7-P z )*10 2 +Q z1};

[0072] Where: W z is the mass flow rate of geothermal steam, measured by the third flow meter W3, in kg / s; P z is the actual pressure of geothermal steam, measured by the third pressure sensor P3; a and b are known fitting coefficients; Q z1 is the heat flow of geothermal steam before pressure correction obtained by combining the data measured by the third temperature sensor T3;

[0073] Step 3: The geothermal heat flow Q obtained in step 2 s2 and geothermal steam heat flow Q z2 Get the geothermal well production capacity Q, Q = Q s2 +Q z2 .

[0074] In this embodiment, preferably, the fitting of the coefficients in the geothermal water heat flow calculation formula after pressure correction in step 2 is obtained by the following steps:

[0075] According to the geothermal water temperature range T smin -T smax , substitute the enthalpy data corresponding to different temperatures in the water enthalpy table into the water enthalpy calculation formula:

[0076]

[0077] According to the data corresponding to the water enthalpy at different temperatures, the coefficient X is fitted. i 、Y i and Zi ;

[0078] Determine the geothermal water heat flow Q before pressure correction s1 The calculation formula is as follows:

[0079]

[0080] Combining the calculation formula of geothermal water heat flow before pressure correction and the influence of pressure on the thermal enthalpy of geothermal water, the following geothermal water heat flow after pressure correction Q is obtained s2 :

[0081]

[0082] Since pressure affects the enthalpy of geothermal water, and the enthalpy of geothermal water changes regularly with pressure, the above-mentioned correction equation is used to express the effect of pressure on the enthalpy of geothermal water. Based on the law of change of geothermal water enthalpy with pressure, the enthalpy data at different pressures in the water enthalpy table are fitted to obtain the coefficients A and B.

[0083] In this embodiment, preferably, the fitting of the coefficients in the geothermal steam heat flow calculation formula after pressure correction is obtained by the following steps:

[0084] According to the geothermal steam temperature range T zmin -T zmax , select the enthalpy data corresponding to the saturated steam enthalpy table and enter it into the steam enthalpy calculation formula:

[0085]

[0086] in: T z is the temperature of geothermal steam, obtained by the second temperature sensor T2; τ2 = T δ2 / T z , T δ2 is the reference temperature value determined for geothermal steam;

[0087] According to the data corresponding to the steam enthalpy at different temperatures, the coefficient n is fitted i 、J i 、X' i 、Y' i 、Z' i ;

[0088] The calculation formula for determining the geothermal steam heat flow before pressure correction is as follows:

[0089]

[0090] Combining the calculation formula of geothermal steam heat flow before pressure correction and the effect of pressure on the thermal enthalpy of geothermal steam, the following calculation formula of geothermal steam heat flow after pressure correction is obtained:

[0091] Q z2 =W z {(a*ln(Q z1 +1)+bQ z1 )(0.7-P)*10 2 +Q z1};

[0092] The enthalpy data at different pressures in the saturated steam table are fitted to obtain the coefficients a and b.

[0093] In this embodiment, preferably, the geothermal steam heat flow Q is obtained z2 The process also includes judging the humidity data measured by the humidity sensor 6, specifically as follows: when the humidity data measured by the humidity sensor 6 is greater than 0, the condensed geothermal gas is subjected to secondary condensation through the second condensing device 8, and the measured data of the third flow meter W3 includes the condensed water obtained by condensation through the first condensing device 3 and the condensed water obtained by condensation through the second condensing device 8; when the humidity data measured by the humidity sensor 6 is equal to 0, the geothermal gas condensed by the first condensing device 3 is directly discharged, and the measured data of the third flow meter W3 includes the condensed water obtained by condensation through the first condensing device 3.

[0094] Taking a geothermal well as an example, the flow rates of geothermal steam and geothermal water are measured by the third flowmeter W3 and the first flowmeter W1, which are 7.5 kg / s and 48 kg / s respectively. The data of the second temperature sensor T2, the third temperature sensor T3, the second pressure sensor P2, and the third pressure sensor P3 are shown in Table 1:

[0095] Table 1 Statistics of the second temperature sensor T2, the third temperature sensor T3, the second pressure sensor P2 and the third pressure sensor P3

[0096] time 0：00 3：00 6：00 9：00 12：00 15：00 18：00 21：00 P2(Mpa) 0.64 0.64 0.67 0.64 0.65 0.62 0.62 0.63 T2(℃) 161 161 163 161 162 159 159 160 P3(Mpa) 0.63 0.64 0.65 0.67 0.63 0.62 0.62 0.64 T3(℃) 160 161 162 163 160 160 160 161

[0097] Based on the measured temperatures, the geothermal water and geothermal steam temperature ranges for this geothermal well are 159°C-163°C (i.e., 432.15K-436.15K) and 160-163°C (i.e., 433.15K-436.15K), respectively. The coefficients in the pressure-corrected geothermal water heat flow calculation formula and the pressure-corrected geothermal steam heat flow calculation formula were fitted based on the temperature ranges, as shown in Tables 2 and 3:

[0098] Table 2 Statistics of coefficients in the geothermal water heat flow calculation formula after pressure correction

[0099]

[0100] Table 3 Statistics of coefficients in the geothermal steam heat flow calculation formula after pressure correction

[0101]

[0102] Table 4 Statistics of geothermal water heat flow, geothermal steam heat flow and geothermal well production capacity in this embodiment

[0103]

[0104] After determining the coefficients in the pressure-corrected geothermal water heat flow calculation formula and the pressure-corrected geothermal steam heat flow calculation formula, the data in Table 1 are substituted into the pressure-corrected geothermal water heat flow calculation formula and the pressure-corrected geothermal steam heat flow calculation formula to obtain the geothermal water heat flow, geothermal steam heat flow, and geothermal well production capacity as shown in Table 4.

[0105] According to the calculation results in Table 4, the geothermal well heat flow monitoring diagram is generated as follows Figure 2 As shown, the horizontal axis Time is time, and the vertical axis Heat Flow is the production capacity of the geothermal well.

[0106] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A method for calculating geothermal well productivity, characterized in that: The geothermal well productivity testing device is used to obtain the productivity of the geothermal well, and the geothermal well productivity testing device includes a gas-liquid separation device, a first condensing device, a cooling device, a humidity sensor, and a second condensing device; The inlet of the gas-liquid separation device is connected to the outlet of the geothermal well through a first pipeline; the liquid outlet of the gas-liquid separation device is connected to the reinjection well through a second pipeline, and the second pipeline is provided with a second temperature sensor, a second pressure sensor and a first flow meter; the gas outlet of the gas-liquid separation device is connected to the inlet of the first condensing device through a third pipeline, and the third pipeline is provided with a third temperature sensor and a third pressure sensor; The condensate outlet of the first condensing device is connected to the recharge well through a fourth pipe, and a third flow meter is provided on the fourth pipe; the coolant outlet of the first condensing device is connected to the inlet of the cooling device through a fifth pipe, and the outlet of the cooling device is connected to the coolant inlet of the first condensing device through a sixth pipe; The gas outlet of the first condensing device is connected to the inlet of the second condensing device, and a humidity sensor is provided on the pipe connecting the gas outlet of the first condensing device and the inlet of the second condensing device; the condensate outlet of the second condensing device is connected to the fourth pipe through a ninth pipe, and a third flow meter is provided between the intersection of the fourth pipe and the ninth pipe and the recharge well; the coolant outlet of the second condensing device is connected to the inlet of the cooling device through a tenth pipe, and the outlet of the cooling device is connected to the coolant inlet of the second condensing device through an eleventh pipe; the gas outlet of the second condensing device is connected to the outside atmosphere through a twelfth pipe; and a pressure pump is provided on both the eleventh pipe and the sixth pipe; The method comprises the following steps: Step 1: Obtain measured data from the second temperature sensor, the second pressure sensor, the first flow meter, the third temperature sensor, the third pressure sensor, and the third flow meter; Step 2: The geothermal water heat flow is obtained by combining the measured data of the second temperature sensor, the second pressure sensor and the first flow meter with the geothermal water heat flow calculation formula after pressure correction. : ； in: is the mass flow rate of geothermal water, measured by the first flow meter; is the actual temperature of the geothermal water, measured by the second temperature sensor; is the actual pressure of the geothermal water, measured by the second pressure sensor; R is the specific gas constant of water; s1 is a constant whose value is determined by get, The symbol for rounding up. T smax and T smin The maximum and minimum temperatures of the geothermal water measured by the second temperature sensor in a day; , is the reference temperature value determined for geothermal water; 、 、 、 A 、 B is the known fitting coefficient; The geothermal steam heat flow rate is obtained by combining the measured data of the third temperature sensor, the third pressure sensor and the third flow meter with the geothermal steam heat flow rate calculation formula after pressure correction. : ； in: is the mass flow rate of geothermal steam, measured by the third flow meter; is the actual pressure of geothermal steam, measured by the third pressure sensor; and is the known fitting coefficient; The heat flow of geothermal steam before pressure correction obtained by combining the data measured by the third temperature sensor; Step 3: Geothermal water heat flow obtained from step 2 and geothermal steam heat flow Get geothermal well production capacity , .

2. The geothermal well productivity calculation method according to claim 1, characterized in that: The fitting of the coefficients in the geothermal water heat flow calculation formula after pressure correction in step 2 is obtained by the following steps: According to the geothermal water temperature range - , substitute the enthalpy data corresponding to different temperatures in the water enthalpy table into the water enthalpy Calculation formula: ； According to the data corresponding to the water enthalpy at different temperatures, the coefficient is fitted 、 and ; Determine the geothermal water heat flow rate before pressure correction The calculation formula is as follows: ； Combining the calculation formula of geothermal water heat flow before pressure correction and the influence of pressure on the thermal enthalpy of geothermal water, the following geothermal water heat flow after pressure correction is obtained: : ； Fit the enthalpy data of water at different pressures in the enthalpy table to obtain the coefficients A and B .

3. The geothermal well productivity calculation method according to claim 1, characterized in that: The fitting of the coefficients in the pressure-corrected geothermal steam heat flow calculation formula is obtained by the following steps: According to the geothermal steam temperature range - , select the enthalpy data corresponding to the saturated steam enthalpy table and substitute it into the steam enthalpy Calculation formula: ； in: ; ; is the temperature of geothermal steam, obtained by the third temperature sensor (T3); , is the reference temperature value determined for geothermal steam; According to the data corresponding to the steam enthalpy at different temperatures, the coefficient is fitted ; The calculation formula for determining the geothermal steam heat flow before pressure correction is as follows: ； Combining the calculation formula of geothermal steam heat flow before pressure correction and the effect of pressure on the thermal enthalpy of geothermal steam, the following calculation formula of geothermal steam heat flow after pressure correction is obtained: ； Fit the enthalpy data at different pressures in the saturated steam table and get the coefficients and .

4. The method for calculating geothermal well productivity according to claim 3, wherein: Obtaining geothermal steam heat flow The process also includes determining the humidity data measured by the humidity sensor (6), as follows: When the humidity data detected by the humidity sensor (6) is greater than 0, the condensed geothermal gas is subjected to secondary condensation by the second condensing device (8), and the measured data of the third flow meter (W3) includes the condensed water obtained by condensation by the first condensing device (3) and the condensed water obtained by condensation by the second condensing device (8); When the humidity data detected by the humidity sensor (6) is equal to 0, the geothermal gas condensed by the first condensing device (3) is directly discharged, and the measured data of the third flow meter (W3) includes condensed water obtained by condensation by the first condensing device (3).

5. The geothermal well productivity calculation method according to claim 1, characterized in that: Also included is a control valve (7); The gas outlet of the first condensing device (3) is connected to the control valve (7) via a seventh pipe (G7), and a humidity sensor (6) is provided on the seventh pipe (G7); one end of the control valve (7) is connected to the outside atmosphere via a pipe, and the other end is connected to the inlet of the second condensing device (8) via an eighth pipe (G8).

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