A geothermal well productivity testing device with coupled step cooling and gas-liquid separation

Abstract

The present invention discloses a geothermal well productivity testing device coupled with step cooling and gas-liquid separation, which is composed of a cooling water loop and a geothermal fluid loop, including: a primary condenser, a secondary condenser, a tertiary condenser, a quaternary condenser, a gas-liquid separator, multiple valves, a water pump, 10 flow testing devices, and 16 pressure and temperature testing devices. In the present invention, the geothermal well productivity testing system can be adjusted to a parallel mode or a series mode. The parallel mode is suitable for productivity testing of geothermal wells with a large flow rate, while the series mode is suitable for productivity testing of geothermal wells with a large dryness flow rate.

Description

Technical Field

[0001] The invention belongs to the field of thermal energy engineering, and in particular relates to a geothermal well productivity testing device coupled with step cooling and gas-liquid separation. Background Art

[0002] Geothermal energy is the heat in rocks and geothermal fluids developed from the earth's crust. Geothermal energy reserves are very rich. In recent years, hot dry rocks have become more representative in geothermal development and have become a hot spot for geothermal energy resource development and utilization at home and abroad in recent years.

[0003] The capacity of geothermal wells is the basis of geothermal development and utilization. Accurately measuring the wellhead capacity can not only evaluate the heat production rate of the reservoir, but also provide basic data for the design of geothermal utilization systems. According to the relationship between the temperature and pressure of geothermal fluids at the wellhead, geothermal fluids are divided into three types: hot water type, wet steam type and dry steam. China's geothermal energy is mainly medium and low temperature, and the state of geothermal fluids at the wellhead is usually hot water or wet steam; in addition, geothermal fluids generally contain non-condensable gases such as carbon dioxide and chlorine sulfide, of which carbon dioxide accounts for 90%. Since the thermal properties of geothermal steam, geothermal water and non-condensable gases are significantly different, it is necessary to more accurately measure the temperature, pressure, flow rate, dryness, non-condensable gas content, etc. of the geothermal fluids at the wellhead of the geothermal well.

[0004] At present, there are mainly the following methods for capacity testing: single-phase test method, calorimeter method, separation method, end pressure method, and tracer dilution method. However, the single-phase test method, calorimeter method, end pressure method, and tracer dilution method usually ignore the dryness and non-condensable gas content during the test, resulting in low test accuracy; and the separation capacity testing device has poor versatility and can generally only perform single-well testing. It has poor applicability to geothermal wells with large changes in temperature, flow rate, and dryness, and the test device has poor matching under non-rated conditions, which will reduce the accuracy of the test results.

[0005] Therefore, there is an urgent need in the prior art for a technical solution that has good adaptability and matching to geothermal wells with large changes in temperature, flow rate, and dryness, and provides accurate test results. Summary of the invention

[0006] The present invention provides a geothermal well productivity testing device coupled with step cooling and gas-liquid separation, comprising:

[0007] Primary condenser (1);

[0008] Secondary condenser (2);

[0009] A three-stage condenser (3);

[0010] Four-stage condenser (4);

[0011] a gas-liquid separator (32); and

[0012] Water pump (34);

[0013] The water supply pipeline of the cooling water loop flows through the fourth-stage condenser (4), the third-stage condenser (3), the second-stage condenser (2) and the first-stage condenser (1) in sequence; on the water supply pipeline of the cooling water loop, a fourteenth valve (19) is provided between the first-stage condenser (1) and the second-stage condenser (2), an eighteenth valve (23) is provided between the second-stage condenser (2) and the third-stage condenser (3), and a twenty-second valve (27) is provided between the third-stage condenser (3) and the fourth-stage condenser (4);

[0014] The water supply pipeline of the geothermal fluid loop flows through the first-stage condenser (1), the second-stage condenser (2), the third-stage condenser (3) and the fourth-stage condenser (4) in sequence; on the water supply pipeline of the geothermal fluid loop, a third valve (8) is provided between the first-stage condenser (1) and the second-stage condenser (2), a seventh valve (12) is provided between the second-stage condenser (2) and the third-stage condenser (3), and an eleventh valve (16) is provided between the third-stage condenser (3) and the fourth-stage condenser (4);

[0015] The cooling water supply trunk line is provided with a sixteenth valve (21), a twentieth valve (25) and a twenty-fourth valve (29); the cooling water supply trunk line and the water supply pipeline are respectively connected with a first cooling water supply branch line, a second cooling water supply branch line, a third cooling water supply branch line and a fourth cooling water supply branch line;

[0016] The end of the first cooling water supply branch is connected to the cooling water inlet of the primary condenser (1) and the outlet of the fourteenth valve (19);

[0017] The end of the second cooling water supply branch is connected to the cooling water inlet of the secondary condenser (2) and the outlet of the eighteenth valve (23), and the seventeenth valve (22) is provided on the second cooling water supply branch;

[0018] The end of the third cooling water supply branch is connected to the cooling water inlet of the third-stage condenser (3) and the outlet of the twenty-second valve (27), and a twenty-first valve (26) is provided on the third cooling water supply branch;

[0019] The end of the fourth cooling water supply branch is connected to the cooling water inlet of the fourth-stage condenser (4), and a twenty-fifth valve (30) is provided on the fourth cooling water supply branch;

[0020] Wherein, the first cooling water return branch, the second cooling water return branch, the third cooling water return branch and the fourth cooling water return branch are respectively connected between the return water trunk and the return water pipeline of the cooling water loop;

[0021] The front end of the first cooling water return branch is connected to the cooling water outlet of the primary condenser (1);

[0022] The front end of the second cooling water return branch is connected to the cooling water outlet of the secondary condenser (2) and the inlet end of the fourteenth valve (19), and a fifteenth valve (20) is provided on the second cooling water return branch;

[0023] The front end of the third cooling water return branch is connected to the cooling water outlet of the third-stage condenser (3) and the inlet end of the eighteenth valve (23), and the third cooling water supply branch is provided with a nineteenth valve (24);

[0024] The front end of the fourth cooling water return branch is connected to the cooling water outlet of the fourth-stage condenser (4) and the inlet end of the twenty-second valve (27), and the fourth cooling water supply branch is provided with a twenty-third valve (28);

[0025] The geothermal fluid water supply trunk is provided with a first valve (6), a fifth valve (10), a ninth valve (14) and a twelfth valve (17); the water supply trunk of the geothermal fluid loop is respectively connected with a first geothermal fluid water supply branch, a second geothermal fluid water supply branch, a third geothermal fluid water supply branch and a fourth geothermal fluid water supply branch;

[0026] The end of the first geothermal fluid water supply branch is connected to the geothermal fluid inlet of the primary condenser (1);

[0027] The end of the second geothermal fluid water supply branch is connected to the cooling water inlet of the secondary condenser (2) and the outlet of the third valve (8), and a second fourth valve (9) is provided on the second geothermal fluid water supply branch;

[0028] The end of the third geothermal fluid water supply branch is connected to the cooling water inlet of the third-stage condenser (3) and the outlet of the seventh valve (12), and the second geothermal fluid water supply branch is provided with an eighth valve (13);

[0029] The end of the fourth geothermal fluid water supply branch is connected to the cooling water inlet of the fourth-stage condenser (4) and the outlet of the eleventh valve (16);

[0030] Wherein, the geothermal fluid water return trunk is respectively connected with a first geothermal fluid water return branch, a second geothermal fluid water return branch, a third geothermal fluid water return branch and a fourth geothermal fluid water return branch;

[0031] The front end of the first geothermal fluid return water branch is connected to the geothermal fluid outlet of the primary condenser (1) and the inlet end of the third valve (8), and a second valve (7) is provided on the first geothermal fluid return water branch;

[0032] The front end of the second geothermal fluid return water branch is connected to the geothermal fluid outlet of the secondary condenser (2) and the inlet end of the seventh valve (12), and a sixth valve (11) is provided on the second geothermal fluid return water branch;

[0033] The front end of the third geothermal fluid return water branch is connected to the geothermal fluid outlet of the third-stage condenser (3) and the inlet end of the eleventh valve (16), and the second geothermal fluid return water branch is provided with a tenth valve (15);

[0034] The front end of the fourth geothermal fluid return water branch is connected to the geothermal fluid outlet of the fourth-stage condenser (4), and a thirteenth valve (18) is provided on the fourth geothermal fluid return water branch;

[0035] The geothermal fluid return water main is connected to the gas-liquid separator inlet pipeline and the reinjection main respectively, a twenty-seventh valve (32) is provided on the gas-liquid separator inlet pipeline, a water pump (34) is provided on the reinjection main, and a twenty-eighth valve (33) is provided on the pipeline connecting the geothermal fluid return water main and the water pump (34).

[0036] The first cooling water supply branch, the second cooling water supply branch, the third cooling water supply branch and the fourth cooling water supply branch are all provided with a pressure gauge and a thermometer;

[0037] The first cooling water return branch, the second cooling water return branch, the third cooling water return branch and the fourth cooling water return branch are all provided with a pressure gauge and a thermometer;

[0038] Pressure gauges and thermometers are provided on the water supply pipeline of the cooling water loop between the fourth-stage condenser (4) and the fourth cooling water return branch, between the third-stage condenser (3) and the third cooling water return branch, and between the second-stage condenser (2) and the second cooling water return branch;

[0039] A pressure gauge and a thermometer are provided on the first cooling water supply branch, the second cooling water supply branch, the third cooling water supply branch, the fourth cooling water supply branch and the first cooling water return branch;

[0040] The first cooling water return branch, the second cooling water return branch, the third cooling water return branch and the fourth cooling water return branch are all provided with flow meters;

[0041] Pressure gauges and thermometers are provided on the water supply pipeline of the geothermal fluid loop, between the first-stage condenser (1) and the first geothermal fluid return water branch, between the second-stage condenser (2) and the second geothermal fluid return water branch, and between the third-stage condenser (3) and the third geothermal fluid return water branch;

[0042] A pressure gauge and a thermometer are provided on the first geothermal fluid water supply branch, the second geothermal fluid water supply branch, the third geothermal fluid water supply branch, the fourth geothermal fluid water supply branch, and the fourth geothermal fluid water return branch;

[0043] Flow meters are provided on the first geothermal fluid water supply branch, the second geothermal fluid water supply branch, the third geothermal fluid water supply branch and the fourth geothermal fluid water supply branch.

[0044] The present invention also proposes a geothermal well productivity testing device coupled with step cooling and gas-liquid separation, comprising:

[0045] Primary condenser (1);

[0046] Secondary condenser (2);

[0047] a gas-liquid separator (32); and

[0048] Water pump (34);

[0049] The water supply pipeline of the cooling water loop flows through the secondary condenser (2) and the primary condenser (1) in sequence; a fourteenth valve (19) is provided between the primary condenser (1) and the secondary condenser (2) on the water supply pipeline of the cooling water loop;

[0050] The water supply pipeline of the geothermal fluid loop flows through the primary condenser (1) and the secondary condenser (2) in sequence; a third valve (8) is provided between the primary condenser (1) and the secondary condenser (2) on the water supply pipeline of the geothermal fluid loop;

[0051] Wherein, a sixteenth valve (21) is arranged on the cooling water supply trunk line, and a first cooling water supply branch line and a second cooling water supply branch line are respectively connected between the cooling water supply trunk line and the water supply pipeline;

[0052] The end of the first cooling water supply branch is connected to the cooling water inlet of the primary condenser (1) and the outlet of the fourteenth valve (19);

[0053] The end of the second cooling water supply branch is connected to the cooling water inlet of the secondary condenser (2) and the outlet of the eighteenth valve (23), and the seventeenth valve (22) is provided on the second cooling water supply branch;

[0054] Wherein, the first cooling water return branch and the second cooling water return branch are respectively connected between the return water trunk and the return water pipeline of the cooling water loop;

[0055] The front end of the first cooling water return branch is connected to the cooling water outlet of the primary condenser (1);

[0056] The front end of the second cooling water return branch is connected to the cooling water outlet of the secondary condenser (2) and the inlet end of the fourteenth valve (19), and a fifteenth valve (20) is provided on the second cooling water return branch;

[0057] The geothermal fluid water supply trunk line is provided with a first valve (6), a fifth valve (10), a ninth valve (14) and a twelfth valve (17); the water supply trunk line of the geothermal fluid loop is respectively connected to a first geothermal fluid water supply branch line and a second geothermal fluid water supply branch line;

[0058] The end of the first geothermal fluid water supply branch is connected to the geothermal fluid inlet of the primary condenser (1);

[0059] The end of the second geothermal fluid water supply branch is connected to the cooling water inlet of the secondary condenser (2) and the outlet of the third valve (8), and a second fourth valve (9) is provided on the second geothermal fluid water supply branch;

[0060] Wherein, the geothermal fluid water return trunk line is respectively connected with a first geothermal fluid water return branch line and a second geothermal fluid water return branch line;

[0061] The front end of the first geothermal fluid return water branch is connected to the geothermal fluid outlet of the primary condenser (1) and the inlet end of the third valve (8), and a second valve (7) is provided on the first geothermal fluid return water branch;

[0062] The front end of the second geothermal fluid return water branch is connected to the geothermal fluid outlet of the secondary condenser (2) and the inlet end of the seventh valve (12), and a sixth valve (11) is provided on the second geothermal fluid return water branch;

[0063] The geothermal fluid return water main is connected to the gas-liquid separator inlet pipeline and the reinjection main respectively, a twenty-seventh valve (32) is provided on the gas-liquid separator inlet pipeline, a water pump (34) is provided on the reinjection main, and a twenty-eighth valve (33) is provided on the pipeline connecting the geothermal fluid return water main and the water pump (34).

[0064] The first cooling water supply branch and the second cooling water supply branch are both provided with a pressure gauge and a thermometer;

[0065] The first cooling water return branch and the second cooling water return branch are both provided with a pressure gauge and a thermometer;

[0066] A pressure gauge and a thermometer are provided on the water supply pipeline of the cooling water loop between the secondary condenser (2) and the second cooling water return branch;

[0067] A pressure gauge and a thermometer are provided on the first cooling water supply branch, the second cooling water supply branch and the first cooling water return branch;

[0068] The first cooling water return branch and the second cooling water return branch are both provided with flow meters;

[0069] A pressure gauge and a thermometer are provided on the water supply pipeline of the geothermal fluid loop, between the first condenser (1) and the first geothermal fluid return water branch, and between the second condenser (2) and the second geothermal fluid return water branch;

[0070] A pressure gauge and a thermometer are provided on the first geothermal fluid water supply branch and the second geothermal fluid water supply branch;

[0071] Flow meters are provided on the first geothermal fluid water supply branch and the second geothermal fluid water supply branch.

[0072] The present invention also proposes a geothermal well productivity testing device coupled with step cooling and gas-liquid separation, comprising:

[0073] Primary condenser (1);

[0074] Secondary condenser (2);

[0075] A three-stage condenser (3);

[0076] a gas-liquid separator (32); and

[0077] Water pump (34);

[0078] The water supply pipeline of the cooling water loop flows through the third-stage condenser (3), the second-stage condenser (2) and the first-stage condenser (1) in sequence; on the water supply pipeline of the cooling water loop, a fourteenth valve (19) is provided between the first-stage condenser (1) and the second-stage condenser (2), and an eighteenth valve (23) is provided between the second-stage condenser (2) and the third-stage condenser (3);

[0079] The water supply pipeline of the geothermal fluid loop flows through the first-stage condenser (1), the second-stage condenser (2), and the third-stage condenser (3) in sequence; on the water supply pipeline of the geothermal fluid loop, a third valve (8) is provided between the first-stage condenser (1) and the second-stage condenser (2), and a seventh valve (12) is provided between the second-stage condenser (2) and the third-stage condenser (3);

[0080] The cooling water supply trunk line is provided with a sixteenth valve (21) and a twentieth valve (25), and the cooling water supply trunk line and the water supply pipeline are respectively connected with a first cooling water supply branch line, a second cooling water supply branch line, and a third cooling water supply branch line;

[0081] The end of the first cooling water supply branch is connected to the cooling water inlet of the primary condenser (1) and the outlet of the fourteenth valve (19);

[0082] The end of the second cooling water supply branch is connected to the cooling water inlet of the secondary condenser (2) and the outlet of the eighteenth valve (23), and the seventeenth valve (22) is provided on the second cooling water supply branch;

[0083] The end of the third cooling water supply branch is connected to the cooling water inlet of the third-stage condenser (3) and the outlet of the twenty-second valve (27), and a twenty-first valve (26) is provided on the third cooling water supply branch;

[0084] Wherein, the first cooling water return branch, the second cooling water return branch, and the third cooling water return branch are respectively connected between the return water trunk and the return water pipeline of the cooling water loop;

[0085] The front end of the first cooling water return branch is connected to the cooling water outlet of the primary condenser (1);

[0086] The front end of the second cooling water return branch is connected to the cooling water outlet of the secondary condenser (2) and the inlet end of the fourteenth valve (19), and a fifteenth valve (20) is provided on the second cooling water return branch;

[0087] The front end of the third cooling water return branch is connected to the cooling water outlet of the third-stage condenser (3) and the inlet end of the eighteenth valve (23), and the third cooling water supply branch is provided with a nineteenth valve (24);

[0088] The geothermal fluid water supply trunk is provided with a first valve (6), a fifth valve (10), and a ninth valve (14); the geothermal fluid water supply trunk of the geothermal fluid loop is respectively connected with a first geothermal fluid water supply branch, a second geothermal fluid water supply branch, and a third geothermal fluid water supply branch;

[0089] The end of the first geothermal fluid water supply branch is connected to the geothermal fluid inlet of the primary condenser (1);

[0090] The end of the second geothermal fluid water supply branch is connected to the cooling water inlet of the secondary condenser (2) and the outlet of the third valve (8), and a second fourth valve (9) is provided on the second geothermal fluid water supply branch;

[0091] The end of the third geothermal fluid water supply branch is connected to the cooling water inlet of the third-stage condenser (3) and the outlet of the seventh valve (12), and the second geothermal fluid water supply branch is provided with an eighth valve (13);

[0092] Wherein, the geothermal fluid water return trunk is respectively connected with a first geothermal fluid water return branch, a second geothermal fluid water return branch, and a third geothermal fluid water return branch;

[0093] The front end of the first geothermal fluid return water branch is connected to the geothermal fluid outlet of the primary condenser (1) and the inlet end of the third valve (8), and a second valve (7) is provided on the first geothermal fluid return water branch;

[0094] The front end of the second geothermal fluid return water branch is connected to the geothermal fluid outlet of the secondary condenser (2) and the inlet end of the seventh valve (12), and a sixth valve (11) is provided on the second geothermal fluid return water branch;

[0095] The front end of the third geothermal fluid return water branch is connected to the geothermal fluid outlet of the third-stage condenser (3) and the inlet end of the eleventh valve (16), and the second geothermal fluid return water branch is provided with a tenth valve (15);

[0096] The geothermal fluid return water main is connected to the gas-liquid separator inlet pipeline and the reinjection main respectively, a twenty-seventh valve (32) is provided on the gas-liquid separator inlet pipeline, a water pump (34) is provided on the reinjection main, and a twenty-eighth valve (33) is provided on the pipeline connecting the geothermal fluid return water main and the water pump (34).

[0097] The first cooling water supply branch, the second cooling water supply branch, and the third cooling water supply branch are all provided with a pressure gauge and a thermometer;

[0098] The first cooling water return branch, the second cooling water return branch, and the third cooling water return branch are all provided with a pressure gauge and a thermometer;

[0099] A pressure gauge and a thermometer are provided on the water supply pipeline of the cooling water loop, located between the third-stage condenser (3) and the third cooling water return branch, and between the second-stage condenser (2) and the second cooling water return branch;

[0100] A pressure gauge and a thermometer are provided on the first cooling water supply branch, the second cooling water supply branch, the third cooling water supply branch and the first cooling water return branch;

[0101] The first cooling water return branch, the second cooling water return branch, and the third cooling water return branch are all provided with flow meters;

[0102] Pressure gauges and thermometers are provided on the water supply pipeline of the geothermal fluid loop, between the first-stage condenser (1) and the first geothermal fluid return water branch, between the second-stage condenser (2) and the second geothermal fluid return water branch, and between the third-stage condenser (3) and the third geothermal fluid return water branch;

[0103] A pressure gauge and a thermometer are provided on the first geothermal fluid water supply branch, the second geothermal fluid water supply branch, the third geothermal fluid water supply branch and the fourth geothermal fluid water return branch;

[0104] Flow meters are provided on the first geothermal fluid water supply branch, the second geothermal fluid water supply branch, and the third geothermal fluid water supply branch.

[0105] The beneficial effects of the present invention compared with the prior art are:

[0106] By adjusting the opening and closing of the valve, the number of condensers required can be controlled according to the state of the geothermal fluid, thereby realizing the production capacity test of geothermal wells with different dryness. It is suitable for pure geothermal water, pure wet saturated steam, geothermal water containing non-condensable gases, and wet saturated steam containing non-condensable gases.

[0107] The inlet and outlet of the gas-liquid separator are connected by a bypass connection, so that the operation of the separator can be adjusted according to actual conditions. When there is no non-condensable gas, the condensed geothermal fluid can pass through the bypass pipeline; when there is non-condensable gas, the condensed geothermal fluid passes through the gas-liquid separator.

[0108] Valves are set at the inlet and outlet of each condenser of the geothermal fluid loop and the cooling water loop. The geothermal well capacity testing system can be adjusted to parallel mode or series mode by adjusting the switch of the valve. The parallel mode is suitable for the capacity testing of geothermal wells with larger flow rates, while the series mode is suitable for the capacity testing of geothermal wells with larger dry flow rates. BRIEF DESCRIPTION OF THE DRAWINGS

[0109] The above and other objects and features will become apparent from the following description with reference to the following drawings, wherein like reference numerals refer to like parts throughout the drawings unless otherwise specified, wherein:

[0110] Figure 1 A schematic structural diagram of the present invention.

[0111] In the figure: 1-first-stage condenser; 2-second-stage condenser; 3-third-stage condenser; 4-fourth-stage condenser; 5-gas-liquid separator; 6-first valve; 7-second valve; 8-third valve; 9-fourth valve; 10-fifth valve; 11-sixth valve; 12-seventh valve; 13-eighth valve; 14-ninth valve; 15-tenth valve; 16-eleventh valve; 17-twelfth valve; 18-thirteenth valve; 19-fourteenth valve; 20-fifteenth valve; 21-sixteenth valve; 22-seventeenth valve; 23-eighteenth valve; 24-nineteenth valve; 25-twentieth valve; 26-twenty-first valve; 27-twenty-second valve; 28-twenty-third valve; 29-twenty-fourth valve; 30-twenty-fifth valve; 31-twenty-sixth valve; 32-twenty-seventh valve; 33-twenty-eighth valve; 34-water pump; 35-geothermal well; 36-recharge well. DETAILED DESCRIPTION

[0112] Below, the exemplary embodiments of the inventive concept will be described in more detail in conjunction with the accompanying drawings. The embodiments of the inventive concept can be modified in various forms, and the scope of the inventive concept should not be interpreted as being limited to the following embodiments. The embodiments of the inventive concept are provided to more fully describe the inventive concept for those skilled in the art. In view of this, in order to describe more clearly, the shapes of the components in the accompanying drawings are exaggerated.

[0113] like Figure 1 In the illustrated embodiment, the geothermal well productivity testing device coupled with stepped cooling and gas-liquid separation consists of a cooling water loop and a geothermal fluid loop, including: a first-stage condenser 1, a second-stage condenser 2, a third-stage condenser 3, a fourth-stage condenser 4, a gas-liquid separator 5, valves 6-33, a water pump 34, 10 flow test devices and 16 pressure and temperature test devices.

[0114] The cooling water loop includes a primary condenser 1, a secondary condenser 2, a tertiary condenser 3, a fourth condenser 4, valves 19-30, 4 flow test devices and 8 pressure and temperature test devices.

[0115] The geothermal fluid loop includes a primary condenser 1, a secondary condenser 2, a tertiary condenser 3, a fourth condenser 4, a gas-liquid separator 5, valves 6-18, a valve 31, a valve 32, a valve 33, a water pump 34, 5 flow test devices and 8 pressure and temperature test devices.

[0116] If the geothermal fluid is pure geothermal water, it does not need to be condensed and separated from the gas and liquid. The cooling water loop in the test device is closed, the geothermal fluid loop valve 6, valve 10, valve 14, valve 17 and valve 33 are opened, and the other valves are closed. The geothermal water is drawn from the geothermal well 35, directly passes through the geothermal fluid water supply trunk line, flows through the valve 33, and is pumped into the recharging well 36 by the water pump 34.

[0117] If the geothermal fluid is pure geothermal water containing non-condensable gas, it needs to be separated into gas and liquid but does not need to be condensed. In the test device, the cooling water loop is closed, the geothermal fluid loop valves 6, 10, 14, 17, 31 and 32 are opened, and the other valves are closed. The geothermal fluid is extracted from the geothermal well 35, directly passes through the geothermal fluid water supply trunk line, and directly enters the gas-liquid separator 5 through the valve 32. The gas-liquid separator 5 separates the non-condensable gas from the geothermal water. The separated liquid geothermal fluid is pumped into the recharge well 36 via the pump 34, and the separated gas phase is discharged from the device after the valve 31.

[0118] If the geothermal fluid is pure wet saturated steam or wet saturated steam containing non-condensable gas, it needs to be condensed. The condenser in the test device can switch between series and parallel connection forms by adjusting the valve according to the characteristics of the geothermal fluid.

[0119] If the geothermal fluid is pure wet saturated steam, there is no need to separate the gas and liquid. The condensed geothermal fluid flows directly into the recharging well. At this time, the valve, valve 33, is opened, and valves 31 and 32 are closed. Geothermal water is extracted from the geothermal well 35 and flows into the first to fourth condensers from the first to fourth geothermal fluid water supply branches respectively. The geothermal fluid that does not enter the geothermal fluid water supply branch flows in the geothermal fluid water supply trunk, and then merges with the condensed geothermal fluid flowing out of the first to fourth geothermal fluid return water branches, flows into the recharging trunk, and after flowing through the valve 33, enters the water pump 34, and is finally pumped into the recharging well 36 by the water pump 34.

[0120] If the geothermal fluid is wet saturated steam containing non-condensable gas, it needs to be separated into gas and liquid, valve 33 is closed, and valves 31 and 32 are opened. Geothermal water is extracted from the geothermal well 35, and flows into the first to fourth condensers from the first to fourth geothermal fluid water supply branches respectively. The geothermal fluid that does not enter the geothermal fluid water supply branch flows in the geothermal fluid water supply trunk, and then merges with the condensed geothermal fluid flowing out of the first to fourth geothermal fluid return water branches. After the condensed geothermal fluid passes through the gas-liquid separator 5, the gas phase passes through the valve 31 and then is discharged from the device, and the separated liquid phase enters the water pump 34, and finally is pumped into the reinjection well 36 by the water pump 34, and the separated gas phase passes through the valve 31 and then is discharged from the device.

[0121] When the geothermal fluid flow is large, the test device is connected in parallel, valves 8, 12, 16, 17, 19, 23 and 27 are always closed, and the switch states of other valves are adjusted according to the required condenser stages.

[0122] In this embodiment, four condensers are used to condense the geothermal fluid, and all other valves in the device are in an open state. The water supply trunk of the geothermal fluid is divided four times and flows into the first-stage condenser 1, the second-stage condenser 2, the third-stage condenser 3, and the fourth-stage condenser 4 respectively. The water supply trunk of the cooling water is divided four times to form four water supply branches, which flow into the fourth-stage condenser 4, the third-stage condenser 3, the second-stage condenser 2 and the first-stage condenser 1 to condense the geothermal fluid. The cooling water after heat exchange flows into the return water trunk through four return water branches. The condensed geothermal fluid flows into the reinjection trunk and directly flows into the reinjection well 36; or, when the geothermal fluid contains non-condensable gas, it is necessary to open valve 32 and close valve 33 so that the non-condensable gas and liquid geothermal fluid are separated by flowing into the gas-liquid separator. The separated liquid geothermal fluid flows into the reinjection well under the action of pump 34, and the separated gas phase is discharged from the device after passing through valve 31.

[0123] In other embodiments of the present application, when three condensers are required for condensing geothermal fluid, valves 14, 18, 28 and 30 in the device are in a closed state, and other valves are in an open state. The geothermal fluid supply trunk is divided three times and flows into the first-stage condenser 1, the second-stage condenser 2 and the third-stage condenser 3 respectively. The cooling water supply trunk is also divided three times to form three water supply branches, which flow into the third-stage condenser 3, the second-stage condenser 2 and the first-stage condenser 1 respectively to condense the geothermal fluid. The cooling water after heat exchange flows into the return water trunk through three return water branches. The condensed geothermal fluid flows into the reinjection trunk and then directly into the reinjection well 36; or, when the geothermal fluid contains non-condensable gas, it is necessary to open valve 32 and close valve 33 so that the non-condensable gas and liquid geothermal fluid are separated by the gas-liquid separator. The separated liquid geothermal fluid flows into the reinjection well under the action of pump 34, and the separated gas phase is discharged from the device after passing through valve 31.

[0124] In other embodiments of the present application, when two condensers are needed to condense the geothermal fluid, valves 13, 14, 15, 18, 24, 26, 28 and 30 in the device are in a closed state, and all other valves are in an open state. The geothermal fluid supply trunk is divided twice to flow into the primary condenser 1 and the secondary condenser 2 respectively, and the cooling water supply trunk is also divided twice to form two water supply branches, which flow into the secondary condenser 2 and the primary condenser 1 respectively to condense the geothermal fluid. The cooling water after heat exchange flows into the return water trunk through two return water branches, and the condensed geothermal fluid flows directly into the recharge well 36 after merging into the recharge trunk; or, when the geothermal fluid contains non-condensable gas, it is necessary to open valve 32 and close valve 33 so that the non-condensable gas and liquid geothermal fluid are separated by the gas-liquid separator, and the separated liquid geothermal fluid flows into the recharge well under the action of pump 34.

[0125] In other embodiments of the present application, when only one condenser is needed to condense the geothermal fluid, the connection of the condenser is not divided into series and parallel. At this time, valve 7, valve 21, valve 25, and valve 29 in the device are in the open state, and other valves are in the closed state. The geothermal fluid and cooling water are not diverted, and only flow into the primary condenser 1 to condense the geothermal fluid; or, when the geothermal fluid contains non-condensable gas, it is necessary to open valve 32 and close valve 33, so that the condensed geothermal fluid flows directly into the recharge well, or flows into the gas-liquid separator to separate the non-condensable gas and liquid geothermal fluid. The separated liquid geothermal fluid flows into the recharge well under the action of pump 34, and the separated gas phase is discharged from the device after passing through valve 31.

[0126] If the geothermal fluid is relatively dry, the test device is connected in series, and valves 6, 9, 10, 13, 14, 20, 24, and 28 are always closed, and the switch states of other valves are adjusted according to the required number of condenser stages.

[0127] In this embodiment, four condensers are required to condense the geothermal fluid. In the device, valves 7, 11, 15, 21, 25 and 29 are in a closed state, and other valves are in an open state. The geothermal fluid is extracted from the geothermal well 35 and flows through the first condenser 1, the second condenser 2, the third condenser 3 and the fourth condenser 4 in sequence. The first to fourth geothermal fluid return water branches are closed, and the cooling water flows through the fourth condenser 4, the third condenser 3, the second condenser 2 and the first condenser 1 in sequence to condense the geothermal fluid. The condensed geothermal fluid flows directly into the recharging well 36 through the action of the water pump 34; or, when the geothermal fluid contains non-condensable gas, it is necessary to open the valve 32 and close the valve 33, so that the condensed geothermal fluid flows into the gas-liquid separator 5 to separate the non-condensable gas and the liquid geothermal fluid. The separated liquid geothermal fluid flows into the recharging well 36 under the action of the pump 34, and the separated gas phase is discharged from the device after passing through the valve 31.

[0128] In other embodiments of the present application, when three condensers are needed to condense the geothermal fluid, valves 7, 11, 16, 18, 21, 25 and 30 in the device are in a closed state, and the other valves are all open. The geothermal fluid flows through the primary condenser 1, the secondary condenser 2 and the tertiary condenser 3 in sequence, and the cooling water flows through the tertiary condenser 3, the secondary condenser 2 and the primary condenser 1 in sequence to condense the geothermal fluid. The condensed geothermal fluid flows directly into the recharging well, or flows into the gas-liquid separator to separate the non-condensable gas and the liquid geothermal fluid. The separated liquid geothermal fluid flows into the recharging well 36 under the action of the pump 34, and the separated gas phase is discharged from the device after passing through the valve 31.

[0129] In other embodiments of the present application, when two condensers are needed to condense the geothermal fluid, valves 7, 12, 15, 16, 18, 21, 26 and 30 in the device are in a closed state, and the other valves are in an open state. The geothermal fluid flows through the primary condenser 1 and the secondary condenser 2 in sequence, and the cooling water flows through the secondary condenser 2 and the primary condenser 1 in sequence to condense the geothermal fluid. The condensed geothermal fluid flows directly into the recharging well, or flows into the gas-liquid separator to separate the non-condensable gas and the liquid geothermal fluid. The separated liquid geothermal fluid flows into the recharging well 36 under the action of the pump 34, and the separated gas phase is discharged from the device after passing through the valve 31.

[0130] In other embodiments of the present application, the number of condensers may be greater, and the connection method thereof is similar to the above-disclosed embodiments, and the series-parallel connection method of each condenser is achieved by controlling the opening and closing of valves similar to the above-disclosed embodiments.

[0131] The effects of the inventive concept are not limited to the above-mentioned effects, and those skilled in the art to which the inventive concept pertains should clearly understand unmentioned effects from the present specification and the accompanying drawings.

[0132] The above detailed description illustrates the inventive concept. In addition, the above content describes exemplary embodiments of the inventive concept, and the inventive concept can be used in a variety of other combinations, variations and environments. That is to say, the inventive concept can be modified and amended as long as it does not depart from the scope of the inventive concept disclosed in the specification, the equivalent scope disclosed in writing and / or the technical or knowledge scope of those skilled in the art. The written embodiments describe the best state for realizing the technical enlightenment of the inventive concept, and various changes can be made according to the specific application field and the purpose of the inventive concept. In view of this, the detailed description of the inventive concept is not intended to limit the inventive concept in the disclosed embodiment state, but should be interpreted as the attached claims including other embodiments.

Claims

1. A geothermal well productivity testing device coupled with step cooling and gas-liquid separation, characterized in that: include: a first-stage condenser (1); a second-stage condenser (2); a third-stage condenser (3); a fourth-stage condenser (4); a gas-liquid separator (5); and a water pump (34); The water supply pipeline of the cooling water loop flows through the fourth-stage condenser (4), the third-stage condenser (3), the second-stage condenser (2) and the first-stage condenser (1) in sequence; on the water supply pipeline of the cooling water loop, a fourteenth valve (19) is provided between the first-stage condenser (1) and the second-stage condenser (2), an eighteenth valve (23) is provided between the second-stage condenser (2) and the third-stage condenser (3), and a twenty-second valve (27) is provided between the third-stage condenser (3) and the fourth-stage condenser (4); The water supply pipeline of the geothermal fluid loop flows through the first-stage condenser (1), the second-stage condenser (2), the third-stage condenser (3) and the fourth-stage condenser (4) in sequence; on the water supply pipeline of the geothermal fluid loop, a third valve (8) is provided between the first-stage condenser (1) and the second-stage condenser (2), a seventh valve (12) is provided between the second-stage condenser (2) and the third-stage condenser (3), and an eleventh valve (16) is provided between the third-stage condenser (3) and the fourth-stage condenser (4); The cooling water supply trunk line is provided with a sixteenth valve (21), a twentieth valve (25) and a twenty-fourth valve (29); the cooling water supply trunk line and the water supply pipeline are respectively connected with a first cooling water supply branch line, a second cooling water supply branch line, a third cooling water supply branch line and a fourth cooling water supply branch line; The end of the first cooling water supply branch is connected to the cooling water inlet of the primary condenser (1) and the outlet of the fourteenth valve (19); The end of the second cooling water supply branch is connected to the cooling water inlet of the secondary condenser (2) and the outlet of the eighteenth valve (23), and the seventeenth valve (22) is provided on the second cooling water supply branch; The end of the third cooling water supply branch is connected to the cooling water inlet of the third-stage condenser (3) and the outlet of the twenty-second valve (27), and a twenty-first valve (26) is provided on the third cooling water supply branch; The end of the fourth cooling water supply branch is connected to the cooling water inlet of the fourth-stage condenser (4), and a twenty-fifth valve (30) is provided on the fourth cooling water supply branch; Wherein, the first cooling water return branch, the second cooling water return branch, the third cooling water return branch and the fourth cooling water return branch are respectively connected between the return water trunk and the return water pipeline of the cooling water loop; The front end of the first cooling water return branch is connected to the cooling water outlet of the primary condenser (1); The front end of the second cooling water return branch is connected to the cooling water outlet of the secondary condenser (2) and the inlet end of the fourteenth valve (19), and a fifteenth valve (20) is provided on the second cooling water return branch; The front end of the third cooling water return branch is connected to the cooling water outlet of the third-stage condenser (3) and the inlet end of the eighteenth valve (23), and the third cooling water return branch is provided with a nineteenth valve (24); The front end of the fourth cooling water return branch is connected to the cooling water outlet of the fourth-stage condenser (4) and the inlet end of the twenty-second valve (27), and a twenty-third valve (28) is provided on the fourth cooling water return branch; The geothermal fluid water supply trunk is provided with a first valve (6), a fifth valve (10), a ninth valve (14) and a twelfth valve (17); the water supply trunk of the geothermal fluid loop is respectively connected with a first geothermal fluid water supply branch, a second geothermal fluid water supply branch, a third geothermal fluid water supply branch and a fourth geothermal fluid water supply branch; The end of the first geothermal fluid water supply branch is connected to the geothermal fluid inlet of the primary condenser (1); The end of the second geothermal fluid water supply branch is connected to the cooling water inlet of the secondary condenser (2) and the outlet of the third valve (8), and a second fourth valve (9) is provided on the second geothermal fluid water supply branch; The end of the third geothermal fluid water supply branch is connected to the cooling water inlet of the third-stage condenser (3) and the outlet of the seventh valve (12), and an eighth valve (13) is provided on the second geothermal fluid water supply branch; The end of the fourth geothermal fluid water supply branch is connected to the cooling water inlet of the fourth-stage condenser (4) and the outlet of the eleventh valve (16); Wherein, the geothermal fluid water return trunk is respectively connected with a first geothermal fluid water return branch, a second geothermal fluid water return branch, a third geothermal fluid water return branch and a fourth geothermal fluid water return branch; The front end of the first geothermal fluid return water branch is connected to the geothermal fluid outlet of the primary condenser (1) and the inlet end of the third valve (8), and a second valve (7) is provided on the first geothermal fluid return water branch; The front end of the second geothermal fluid return water branch is connected to the geothermal fluid outlet of the secondary condenser (2) and the inlet end of the seventh valve (12), and a sixth valve (11) is provided on the second geothermal fluid return water branch; The front end of the third geothermal fluid return water branch is connected to the geothermal fluid outlet of the third-stage condenser (3) and the inlet end of the eleventh valve (16), and the second geothermal fluid return water branch is provided with a tenth valve (15); The front end of the fourth geothermal fluid water return branch is connected to the geothermal fluid outlet of the fourth-stage condenser (4), and a thirteenth valve (18) is provided on the fourth geothermal fluid water return branch; The geothermal fluid return water main line is connected to the gas-liquid separator inlet pipeline and the reinjection main line respectively, a twenty-seventh valve (32) is provided on the gas-liquid separator inlet pipeline, a water pump (34) is provided on the reinjection main line, and a twenty-eighth valve (33) is provided on the pipeline connecting the geothermal fluid return water main line and the water pump (34).

2. The geothermal well productivity testing device coupled with step cooling and gas-liquid separation according to claim 1 is characterized in that: The first cooling water supply branch, the second cooling water supply branch, the third cooling water supply branch and the fourth cooling water supply branch are all provided with a pressure gauge and a thermometer; The first cooling water return branch, the second cooling water return branch, the third cooling water return branch and the fourth cooling water return branch are all provided with a pressure gauge and a thermometer; Pressure gauges and thermometers are provided on the water supply pipeline of the cooling water loop between the fourth-stage condenser (4) and the fourth cooling water return branch, between the third-stage condenser (3) and the third cooling water return branch, and between the second-stage condenser (2) and the second cooling water return branch; A pressure gauge and a thermometer are provided on the first cooling water supply branch, the second cooling water supply branch, the third cooling water supply branch, the fourth cooling water supply branch and the first cooling water return branch; The first cooling water return branch, the second cooling water return branch, the third cooling water return branch and the fourth cooling water return branch are all provided with flow meters; Pressure gauges and thermometers are provided on the water supply pipeline of the geothermal fluid loop, between the first-stage condenser (1) and the first geothermal fluid return water branch, between the second-stage condenser (2) and the second geothermal fluid return water branch, and between the third-stage condenser (3) and the third geothermal fluid return water branch; A pressure gauge and a thermometer are provided on the first geothermal fluid water supply branch, the second geothermal fluid water supply branch, the third geothermal fluid water supply branch, the fourth geothermal fluid water supply branch, and the fourth geothermal fluid water return branch; Flow meters are provided on the first geothermal fluid water supply branch, the second geothermal fluid water supply branch, the third geothermal fluid water supply branch and the fourth geothermal fluid water supply branch.

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