Geothermal well productivity testing device and productivity calculation method

Abstract

The invention relates to the technical field of geothermal productivity testing, and discloses a geothermal well productivity testing device and a productivity calculation method. The productivity testing device comprises the gas-liquid separation device, the first condensing device, the cooling device and the humidity sensor, geothermal fluid is preliminarily divided into geothermal gas and geothermal water through the gas-liquid separation device, water vapor in the geothermal gas is further condensed through the multi-stage circulating cooling device, and the accuracy of flow data is improved. Relative coefficients of enthalpy value calculation are fitted through actual measurement data of a plurality of sensors and flow meters, heat flow of geothermal water and heat flow of geothermal steam are calculated respectively in combination with a heat flow calculation formula, and then the total productivity of the geothermal well is obtained, so that the problems of low calculation precision and calculation complexity in the prior art are effectively solved, and the calculation efficiency is improved. And important technical support is provided for evaluation and utilization of geothermal resources.

Description

Technical Field

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

[0002] As a green, renewable and environmentally friendly energy, geothermal energy is gaining more and more attention and application in various countries. Especially in some areas with rich geothermal resources, geothermal energy can not only be used for power generation, but also provide stable and low-carbon energy support for urban heating and industrial heating.

[0003] Geothermal energy has huge potential. How to effectively evaluate the production capacity of geothermal wells and rationally plan and utilize geothermal resources is a major problem that needs to be solved in this field. Before implementing measures to efficiently evaluate the production capacity of geothermal wells, it is necessary to accurately calculate the actual production capacity of geothermal wells. There is no ready-made formula in the prior art that can directly calculate the production capacity of geothermal wells. Therefore, it is of great significance to develop a geothermal well production capacity testing device and a production capacity calculation method.

[0004] The prior art is as follows: CN108254103A, this invention application discloses a geothermal well capacity testing device and its testing method, which mainly transfers the heat of geothermal water extracted from the well to the external input cold water through a heat exchanger, and calculates the capacity 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 capacity 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 capacity testing system, which diverts a part of the collected geothermal fluid, separates the diverted geothermal fluid into gas and liquid, and cools it, and calculates the proportion of geothermal water, geothermal water vapor and non-condensable gas in the separated geothermal fluid.

[0005] At present, the existing capacity calculation formula has the following problems when calculating the capacity of high-temperature geothermal wells: ① There is no complete geothermal well capacity calculation formula yet, and calculations require looking up tables to compare 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 capacity calculation method that can accurately and efficiently implement geothermal well capacity testing to solve the problems existing in the prior art. Summary of the invention

[0007] The purpose of the present invention is to provide a device and a capacity calculation method that can accurately and efficiently realize geothermal well capacity testing. The specific technical scheme is 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 arranged 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, which 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 quick 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 condensate 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 geothermal water that is not completely separated in the first condensing device, thereby ensuring the accuracy of geothermal well productivity testing.

[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 the capacity of a geothermal well, which uses the above-mentioned geothermal well capacity testing device to obtain the capacity of the geothermal well, and specifically includes the following steps:

[0017] Step 1: Obtain 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;

[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 based on get, The symbol for rounding up, T smax and T smin is the maximum and minimum temperatures of the geothermal water measured by the second temperature sensor (T2) in a day; τ 1 =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 +Qz1};

[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 is the heat flow of geothermal steam before pressure correction obtained by combining the data measured by the third temperature sensor;

[0024] Step 3: Based on the geothermal heat flow Q obtained in step 2 s2 and geothermal steam heat flow Q z2 Get the geothermal well 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 , bring 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 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 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 substitute 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); τ 2 =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 determining 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 the first condensing device and the condensed water obtained 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 obtained by condensation by the first condensing device.

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

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

[0050] Figure 1 It is a structural schematic diagram of a geothermal well productivity testing device in a preferred embodiment 1 of the present invention;

[0051] Figure 2 It is a heat flow monitoring diagram of a geothermal well 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. booster pump, 6. humidity sensor, 7. control valve, 8. second condensing device, 9. reinjection well;

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

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

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

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

[0057] The embodiments of the present invention are described in detail below with reference to the accompanying drawings, but 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, comprising 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 of which 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 pipeline G1. The first pipeline 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 reinjection well 9 through a second pipeline G2, and a second temperature sensor T2, a second pressure sensor P2 and a first flow meter W1 are provided on the second pipeline G2.

[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 pipeline G3. The third pipeline 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 for real-time monitoring of the temperature, pressure and flow of the geothermal gas flowing out of the geothermal well.

[0063] The condensate outlet of the first condensing device 3 is connected to the recharge well 9 through a fourth pipe G4, and a third flow meter W3 is provided on the fourth pipe G4; the coolant outlet of the first condensing device 3 is connected to the inlet of the cooling device 4 through a fifth pipe G5, and the outlet of the cooling device 4 is connected to the coolant inlet of the first condensing device 3 through a 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 provided 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 the ninth pipeline G9, and a third flow meter W3 is provided between the intersection of the fourth pipeline G4 and the ninth pipeline G9 and the reinjection well 9; the coolant outlet of the second condensing device 8 is connected to the inlet of the cooling device 4 through the tenth pipeline G10, and the outlet of the cooling device 4 is connected to the coolant inlet of the second condensing device 8 through the eleventh pipeline G11; the gas outlet of the second condensing device 8 is connected to the outside atmosphere through the twelfth pipeline G12; the eleventh pipeline G11 and the sixth pipeline G6 are both provided with a booster pump 5. Further preferably, the gas outlet of the first condensing device 3 is connected to the control valve 7 through the seventh pipeline G7, and the humidity sensor 6 is provided on the seventh pipeline G7; 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 the eighth pipeline G8.

[0065] The geothermal well productivity testing device of this embodiment is used to test the geothermal well productivity to obtain the productivity of the geothermal well. In order 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 of 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, with a value of 0.461526 kJ kg -1 K -1 ; s1 is a constant, its value is based on get, The symbol for rounding up, T smax and Tsmin is the maximum and minimum temperature of the geothermal water measured by the second temperature sensor T2 in a day; τ 1 =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: Based on the geothermal heat flow Q obtained in step 2 s2 and geothermal steam heat flow Q z2 Get the geothermal well 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 , bring 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 , Yi and Z i ;

[0078] Determine the geothermal 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 correction equation is used to express the effect of pressure on the enthalpy of geothermal water. According to the law of the change of the enthalpy of geothermal water with pressure, the enthalpy data at different pressures in the enthalpy table of water are fitted to obtain 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 substitute 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; τ 2 =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, 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 condensation device 8, and the measured data of the third flow meter W3 includes the condensed water obtained by condensation through the first condensation device 3 and the condensed water obtained by condensation through the second condensation device 8; when the humidity data measured by the humidity sensor 6 is equal to 0, the geothermal gas condensed by the first condensation 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 condensation device 3.

[0094] Taking a geothermal well as an example, the flow rates of geothermal steam and geothermal water are measured by the third flow meter W3 and the first flow meter 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] According to the measured temperature, the temperature ranges of the geothermal water and geothermal steam of the geothermal well are 159℃-163℃ (i.e. 432.15K-436.15K) and 160-163℃ (i.e. 433.15K-436.15K), respectively. The coefficients in the calculation formula of geothermal water heat flow after pressure correction and the coefficients in the calculation formula of geothermal steam heat flow after pressure correction are fitted according to the temperature range, as shown in Table 2 and Table 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 above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A geothermal well productivity testing device, characterized in that: It comprises a gas-liquid separation device (2), a first condensing device (3), a cooling device (4) and a humidity sensor (6); The inlet of the gas-liquid separation device (2) is connected to the outlet of the geothermal well (1) through a first pipeline (G1); the liquid outlet of the gas-liquid separation device (2) is connected to the reinjection well (9) through a second pipeline (G2), and the second pipeline (G2) is provided with a second temperature sensor (T2), a second pressure sensor (P2) and a first flow meter (W1); the gas outlet of the gas-liquid separation device (2) is connected to the inlet of the first condensing device (3) through a third pipeline (G3), and the third pipeline (G3) is provided with a third temperature sensor (T3) and a third pressure sensor (P3); The condensate outlet of the first condensing device (3) is connected to the reinjection well (9) via a fourth pipe (G4), and a third flow meter (W3) is provided on the fourth pipe (G4); the coolant outlet of the first condensing device (3) is connected to the inlet of the cooling device (4) via a fifth pipe (G5), and the outlet of the cooling device (4) is connected to the coolant inlet of the first condensing device (3) via a sixth pipe (G6).

2. The geothermal well productivity testing device according to claim 1, characterized in that: Also includes a second condensing device (8); 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 provided on the pipeline connecting the gas outlet of the first condensing device (3) and the inlet of the second condensing device (8); the condensate outlet of the second condensing device (8) is connected to the fourth pipeline (G4) through the ninth pipeline (G9), and a third flow meter (W3) is provided between the intersection of the fourth pipeline (G4) and the ninth pipeline (G9) and the reinjection well (9); the coolant outlet of the second condensing device (8) is connected to the inlet of the cooling device (4) through the tenth pipeline (G10), and the outlet of the cooling device (4) is connected to the coolant inlet of the second condensing device (8) through the eleventh pipeline (G11); the gas outlet of the second condensing device (8) is connected to the outside atmosphere through the twelfth pipeline (G12); The eleventh pipeline (G11) and the sixth pipeline (G6) are both provided with a pressure pump (5).

3. The geothermal well productivity testing device according to claim 2, characterized in that: Also includes a control valve (7); The gas outlet of the first condensing device (3) is connected to the control valve (7) via a seventh pipeline (G7), and a humidity sensor (6) is provided on the seventh pipeline (G7); one end of the control valve (7) is connected to the outside atmosphere via a pipeline, and the other end is connected to the inlet of the second condensing device (8) via an eighth pipeline (G8).

4. A method for calculating the productivity of a geothermal well, characterized in that: The geothermal well productivity testing device according to any one of claims 2 to 3 is used to obtain the productivity of the geothermal well, which specifically includes the following steps: Step 1, obtaining measured data of 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); 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 : 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 based on get, The symbol for rounding up, T smax and T smin is the maximum and minimum temperature of the geothermal water measured by the second temperature sensor (T2) in a 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; 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 : Q z2 =W z {(a*ln(Q z1 +1)+b-Q z1 )(0.7-P z )*10 2 +Q z1 }; Where: W z is the mass flow rate of geothermal steam, measured by the third flow meter (W3); 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); Step 3: Based on the geothermal heat flow Q obtained in step 2 s2 and geothermal steam heat flow Q z2 Get the geothermal well capacity Q, Q = Q s2 +Q z2 .

5. The method for calculating geothermal well productivity according to claim 4, 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 T smin -T smax , substitute the enthalpy data corresponding to different temperatures in the water enthalpy table into the water enthalpy h s Calculation formula: According to the data corresponding to the water enthalpy at different temperatures, the coefficient X is fitted. i , Y i and Z i ; Determine the geothermal heat flow Q before pressure correction s1 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 Q is obtained: s2 : The enthalpy data of water at different pressures in the enthalpy table are fitted to obtain the coefficients θ and B.

6. The method for calculating geothermal well productivity according to claim 4, 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 T zmin -T zmax , select the enthalpy data corresponding to the saturated steam enthalpy table and substitute it into the steam enthalpy h z Calculation formula: 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; 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 ; 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: Q z2 =W z {(a*ln(Q z1 +1)+b-Q z1 )(0.7-P)*10 2 +Q z1 }; The enthalpy data at different pressures in the saturated steam table are fitted to obtain the coefficients a and b.

7. The method for calculating geothermal well productivity according to claim 6, characterized in that: Get geothermal steam heat flow Q z2 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 condensed water obtained by condensation by the first condensing device (3) and 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 condensation device (3) is directly discharged, and the measured data of the third flow meter (W3) includes condensed water obtained by condensation by the first condensation device (3).

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