CN116148154B - Experimental device and interpretation method for simulating core seepage heat and mass transfer under high temperature and high pressure - Google Patents
Experimental device and interpretation method for simulating core seepage heat and mass transfer under high temperature and high pressure Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000012546 transfer Methods 0.000 title claims abstract description 31
- 230000035699 permeability Effects 0.000 claims abstract description 22
- 238000002347 injection Methods 0.000 claims abstract description 21
- 239000007924 injection Substances 0.000 claims abstract description 21
- 230000008569 process Effects 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 133
- 239000000700 radioactive tracer Substances 0.000 claims description 97
- 238000006073 displacement reaction Methods 0.000 claims description 51
- 229910001220 stainless steel Inorganic materials 0.000 claims description 43
- 239000010935 stainless steel Substances 0.000 claims description 43
- 239000011435 rock Substances 0.000 claims description 40
- 239000000523 sample Substances 0.000 claims description 29
- 238000005070 sampling Methods 0.000 claims description 29
- 239000006185 dispersion Substances 0.000 claims description 17
- 229920001973 fluoroelastomer Polymers 0.000 claims description 15
- 239000011159 matrix material Substances 0.000 claims description 13
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 229920001971 elastomer Polymers 0.000 claims description 6
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- 230000009466 transformation Effects 0.000 claims description 4
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- 238000002474 experimental method Methods 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000008859 change Effects 0.000 description 14
- YZCKVEUIGOORGS-OUBTZVSYSA-N Deuterium Chemical compound [2H] YZCKVEUIGOORGS-OUBTZVSYSA-N 0.000 description 7
- YZCKVEUIGOORGS-NJFSPNSNSA-N Tritium Chemical compound [3H] YZCKVEUIGOORGS-NJFSPNSNSA-N 0.000 description 7
- 229910052805 deuterium Inorganic materials 0.000 description 7
- 229920000642 polymer Polymers 0.000 description 7
- 229910052722 tritium Inorganic materials 0.000 description 7
- 238000012360 testing method Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
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- 230000004048 modification Effects 0.000 description 3
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 2
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- NJDNXYGOVLYJHP-UHFFFAOYSA-L disodium;2-(3-oxido-6-oxoxanthen-9-yl)benzoate Chemical compound [Na+].[Na+].[O-]C(=O)C1=CC=CC=C1C1=C2C=CC(=O)C=C2OC2=CC([O-])=CC=C21 NJDNXYGOVLYJHP-UHFFFAOYSA-L 0.000 description 1
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- 235000011164 potassium chloride Nutrition 0.000 description 1
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Abstract
The application relates to the field of heat and mass transfer experiments, in particular to an experimental device and an interpretation method for simulating core seepage heat transfer under high temperature and high pressure. The experimental system comprises: the temperature and pressure control assembly is connected with the sample injection assembly and the clamp assembly, and the upper computer is connected with the clamp assembly, the temperature and pressure control assembly, the sample injection assembly and the upper computer in a control manner, and the beneficial effects of the application are that: according to the experimental device and the method, the fracture opening, the permeability and the thermal conductivity of the core can be obtained, and the seepage heat transfer process of the core is further characterized. Through multiple experiments, the influence of the opening degree of the core fracture, the permeability and the heat conductivity on the core seepage heat transfer can be explored.
Description
Technical field:
the application relates to the field of heat and mass transfer experiments, in particular to an experimental device and an interpretation method for simulating core seepage heat transfer under high temperature and high pressure.
The background technology is as follows:
the deep dry-hot rock exploitation is to carry out fracturing on an underground high-temperature reservoir to construct a complex seam network so as to realize efficient heat exchange. Efficient heat exchange focuses on the variation of two parameters in reservoir fracturing processes: the fracture opening and permeability are also related to the thermal conductivity of the core. The crack opening of the deep dry-hot rock reservoir is in a micrometer scale, the geophysical exploration method cannot realize fine characterization of the crack opening, and the seepage heat transfer process of the reservoir cannot be inverted. For example, in the prior art, the flow of the working medium in the core is represented by a CT and resistivity test method, but the resolution of the physical method is low at present, and the change of the fracture opening of the micrometer scale cannot be represented.
On the other hand, current laboratory scale studies on percolation heat transfer have some limitations:
most of the prior art only focuses on the temperature change of the injected working medium, but the technology ignores the reasons for the change of core seepage heat transfer, such as the change of fracture opening and permeability. Thus, the established device and method cannot study the influence of the morphological change of the rock core fracture on the seepage heat transfer of the rock core.
The influence of a seepage field on heat transfer is considered, but a special camera for a tool-particle image testing method (PIV) for researching the seepage field needs to shoot a flowing process, and for a rock core, cracks of the rock core are mainly distributed in the rock core and cannot be directly observed through the special camera for the PIV.
On the other hand, there is also proposed a method of injecting a tracer, wherein after a displacement working medium carrying the tracer passes through a core, the core is crushed, and whether the tracer remains or not is observed. And further judging whether the fluid passes through the microcracks. However, the method needs to damage the core, and the damage to the core should be avoided as much as possible because of few cores in the actual field.
The application comprises the following steps:
the application discloses an experimental device and an interpretation method for simulating core seepage heat and mass transfer under high temperature and high pressure, which are used for solving any one of the above and other potential problems in the prior art.
In order to solve the technical problems, the technical scheme of the application is as follows: an experimental system for simulating core seepage heat and mass transfer at high temperature and high pressure, the experimental system comprising:
the sample injection assembly is used for storing the displacement working medium and the tracer and sequentially injecting the displacement working medium and the tracer into the core to be detected;
the holder assembly is used for keeping the core to be measured stable and suspending and holding the core to be measured in a closed environment;
the temperature and pressure control assembly is used for controlling the temperature, injection pressure/flow of the displacement working medium and the tracer agent and the temperature and pressure inside the clamp holder assembly so as to form a high-temperature and high-pressure environment inside the clamp holder assembly;
the sampling assembly is used for collecting the parameter value of the water outlet of the clamp holder assembly;
and the upper computer is used for controlling the sample injection assembly, the temperature and pressure control assembly and the sampling assembly and analyzing and interpreting the acquired data.
Further, the sample injection assembly comprises a first metering pump, a displacement working medium intermediate container, a tracer intermediate container, a first replacement bottle, a second replacement bottle, a first three-way valve, a second three-way valve, a third three-way valve, a fourth three-way valve, a fifth three-way valve and a sixth three-way valve;
the first metering pump is connected with a second three-way valve and a third three-way valve through a pipeline and a first three-way valve respectively, and the second three-way valve and the third three-way valve are connected with one end of a second replacement bottle of the displacement working medium intermediate container, the tracer intermediate container and the first replacement bottle respectively;
the other ends of the displacement working medium intermediate container, the tracer intermediate container, the first replacement bottle and the second replacement bottle are connected with a fourth three-way valve and a fifth three-way valve through pipelines, and the fourth three-way valve and the fifth three-way valve are connected with a sixth three-way valve;
the first metering pump, the first three-way valve, the second three-way valve, the third three-way valve, the fourth three-way valve, the fifth three-way valve and the sixth three-way valve are all in control connection with the upper computer.
Further, the gripper assembly includes: stainless steel holder, stainless steel shell and fluororubber rubber sleeve;
the stainless steel shell is arranged at the center of the stainless steel clamp holder, the fluororubber sleeve is hollow and cylindrical, a core is placed inside the fluororubber sleeve, the fluororubber sleeve is arranged inside the stainless steel shell, a water inlet and a water outlet are respectively formed in two ends of the stainless steel shell, the water inlet is connected with the sixth three-way valve through a pipeline, and the water outlet is connected with the sampling assembly through a pipeline.
Further, the temperature and pressure control assembly comprises a first heater, a second metering pump, a manual pump, a one-way valve, a temperature probe, a first temperature and pressure sensor and a second temperature and pressure sensor;
the first heater is respectively connected with the displacement working medium middle container, the tracer middle container, the first replacement bottle and the second replacement bottle;
the first heater is connected with the intermediate container and the replacement bottle through pipelines and valves;
the second heater is arranged inside the stainless steel shell;
the second metering pump is communicated with the stainless steel shell cavity through a pipeline and a one-way valve;
the manual pump is connected with the water outlet through a pipeline and a valve and is used for controlling the pressure of the water outlet;
the temperature measuring probe is arranged in the stainless steel shell cavity;
the first temperature and pressure sensor and the second temperature and pressure sensor are respectively arranged on the water inlet and the water outlet;
the first heater, the second metering pump, the first temperature and pressure sensor and the second temperature and pressure sensor are all connected with the upper computer.
Further, the sampling assembly comprises a back pressure valve, a condenser, a flow rate meter and a sampling bottle;
one end of the flow velocity meter is connected with the water outlet through a pipeline, a back pressure valve and a condenser are arranged on the pipeline, the other end of the flow velocity meter is connected with the sampling bottle through a pipeline, and a sampling port is arranged on the sampling bottle;
and the back pressure valve and the flow velocity meter are connected with the upper computer.
The application also aims to provide an interpretation method for inverting core seepage heat transfer by adopting the experimental system, which specifically comprises the following steps:
s1) selecting a core to be measured, and placing the core to be measured in a holder assembly;
s2) the upper computer regulates the temperature and the pressure through the temperature and pressure control assembly to enable the core to be detected in the clamp holder assembly to be in a high-temperature and high-pressure environment, and meanwhile, the displacement working medium and the tracer are heated and pressurized;
s3) sequentially injecting the heated and pressurized displacement working medium and tracers with different densities into a clamp holder assembly through a sample injection assembly, and collecting the temperature, pressure and flow values of a water inlet and a water outlet and the concentration value of the tracer discharged from the water outlet;
s4) inverting the fracture opening degree b according to the tracer concentration value acquired in the S3);
calculating to obtain core permeability k according to the flow value;
and calculating according to the crack opening b and the water outlet temperature value to obtain the thermal conductivity value R of the core.
Further, the length of the core to be measured in the step S1) is not less than 200mm.
Further, the displacement working medium and the tracer in the S2) are heated to be more than 100 ℃ and pressurized to be more than 20 MPa;
the temperature of the high-temperature high-pressure environment is 100-200 ℃ and the pressure is 20-80MPa.
Further, the specific process of S3) is as follows:
s3.1) continuously injecting the heated and pressurized displacement working medium into a holder assembly, and detecting that the pressure of a water inlet and the flow of a water outlet are stable, wherein a seepage field in the core to be detected reaches a steady state;
s3.2) switching the valve to sequentially inject heated and pressurized tracers with different densities into the core to be detected, and collecting the temperature, pressure and flow values of the water inlet and the water outlet and the concentration value of the tracer at the water outlet in the process of injecting the tracers.
Further, the specific step of S4) is as follows:
s4.1) substituting the concentration value of the collected tracer sample according to the S3.2) into the following formula to calculate a crack opening value b, wherein the formula is as follows:
wherein:the porosity of the core matrix, b is the fracture opening degree, eta is the porosity of the core fracture, and D m D is the hydrodynamic dispersion coefficient of the tracer in the core matrix f Is the hydrodynamic dispersion system of the tracer in the rock core fracture, s is the independent variable in the Laplace transformation, h is the rock core diameter, V is the water outlet flow velocity, L is the rock core length, C f The concentration of tracer tested;
s4.2) substituting the water outlet pressure and the water outlet flow value acquired in the step S3.2) into the following formula to calculate the permeability k of the core, wherein the formula is as follows:
wherein: q is the flow rate of the water outlet, mu is the dynamic viscosity coefficient of the fluid, P 2 For the water outlet pressure, P 1 Is the pressure of the water inlet;
s4.3) substituting the temperature value of the water outlet acquired in the step S3.2) and the crack opening value b obtained in the step S4.1) into the following formula to obtain the thermal conductivity R of the core to be measured, wherein the formula is as follows:
wherein θ is the temperature of the non-dimensionalized effluent, T is the temperature of the water outlet, T r T is the temperature in the cavity of the stainless steel shell w For the water inlet temperature, D t Is the thermal dispersion coefficient of the core, C P，f Specific heat capacity of core ρ f Is the core density.
The tracer comprises tritium water/deuterium water/ferroferric oxide-polymer mixed tracer and inert solute tracer.
The beneficial effects of the application are as follows: by adopting the technical scheme, the experimental device and the method can obtain the fracture opening, the permeability and the heat conductivity of the core on the premise of not breaking and damaging the core, so as to characterize the seepage heat transfer process of the core. Compared with the traditional single tracing method for inverting the fracture opening, the experimental method has more accurate results; because the device can not damage the rock core, the rock core can run continuously for a long time, the change of the permeability and the crack opening along with time is obtained, and the influence of the working medium-rock reaction on the permeability and the crack opening of the rock core is further explored. Through reasonable design of an experimental scheme, the influence of the opening degree of the rock core fracture, the permeability and the heat conductivity on the seepage heat transfer of the rock core can be explored.
Drawings
Fig. 1 is a schematic structural diagram of an experimental device for simulating core seepage heat and mass transfer at high temperature and high pressure.
Fig. 2 is a flow chart of the experimental interpretation method for simulating core seepage heat and mass transfer under high temperature and high pressure.
In the figure:
1-a first metering pump; 2-a first replacement bottle; 3-displacing a working medium intermediate container; 4-tracer intermediate container; 5-a second replacement bottle; 6-a first three-way valve; 7-a second three-way valve; 8-a third three-way valve; 9-a fourth three-way valve; 10-a fifth three-way valve; 11-a sixth three-way valve; 12-stainless steel holder; 13-stainless steel housing cavity; 14-stainless steel housing; 15-fluororubber rubber sleeve; 16-a first temperature and pressure sensor; 17-a second metering pump; 18-a one-way valve; 19-a back pressure valve; a 20-condenser; 21-a flow rate meter; 22-sampling bottle; 23-a manual pump 24-a second temperature and pressure sensor and 25-an upper computer.
Detailed Description
The technical scheme of the application is further described below with reference to the attached drawings and specific embodiments.
As shown in fig. 1, the experimental system for simulating core seepage heat and mass transfer at high temperature and high pressure provided by the application comprises:
the sample injection assembly is used for storing the displacement working medium and the tracer and sequentially injecting the displacement working medium and the tracer into the core to be detected;
the holder assembly is used for keeping the core to be measured stable and suspending and holding the core to be measured in a closed environment;
the temperature and pressure control assembly is used for controlling the temperature, injection pressure/flow of the displacement working medium and the tracer agent and the temperature and pressure inside the clamp holder assembly so as to form a high-temperature and high-pressure environment inside the clamp holder assembly;
the sampling assembly is used for collecting the parameter value of the water outlet of the clamp holder assembly;
and the upper computer 25 is used for controlling the sample injection assembly, the temperature and pressure control assembly and the sampling assembly and analyzing and interpreting the acquired data.
The sample injection assembly comprises a first metering pump 1, a displacement working medium intermediate container 3, a tracer intermediate container 4, a first replacement bottle 2, a second replacement bottle 5, a first three-way valve 6, a second three-way valve 7, a third three-way valve 8, a fourth three-way valve 9, a fifth three-way valve 10 and a sixth three-way valve 11;
the first metering pump 1 is respectively connected with a second three-way valve 7 and a third three-way valve 8 through a pipeline and a first three-way valve 6, and the second three-way valve 7 and the third three-way valve 8 are respectively connected with one ends of the displacement working medium intermediate container 3, the tracer intermediate container 4, the first replacement 2 and the second replacement bottle 5;
the other ends of the displacement working medium intermediate container 3, the tracer intermediate container 4, the first replacement bottle 2 and the second replacement bottle 5 are connected with a fourth three-way valve 9 and a fifth three-way valve 10 through pipelines, and the fourth three-way valve 9 and the fifth three-way valve 10 are connected with a sixth three-way valve 11;
the first metering pump 1, the first three-way valve 6, the second three-way valve 7, the third three-way valve 8, the fourth three-way valve 9, the fifth three-way valve 10 and the sixth three-way valve 11 are all in control connection with the upper computer 25.
The gripper assembly includes: a stainless steel holder 12, a stainless steel housing 14 and a fluororubber sleeve 15;
the stainless steel shell 14 is arranged at the center of the stainless steel holder 12, a water inlet and a water outlet are respectively formed in two ends of the stainless steel shell 14, the water inlet is connected with the sixth three-way valve 12 through a pipeline, the water outlet is connected with the sampling assembly through a pipeline, the fluororubber sleeve 15 is arranged inside the stainless steel shells and 14, and the fluororubber sleeve 15 is in a cylindrical shape with a hollow inside and is used for placing a core to be measured.
The temperature and pressure control assembly comprises a first heater, a second metering pump 17, a manual pump 23, a one-way valve 18, a temperature measuring probe, a first temperature and pressure sensor 16 and a second temperature and pressure sensor 24;
wherein the first heater (not shown in the figure) is respectively connected with the displacement medium intermediate container 3, the tracer intermediate container 4, the first replacement bottle 2 and the second replacement bottle 5;
the second heater (not shown) is disposed inside the stainless steel housing 14;
the second metering pump 17 is communicated with the stainless steel shell cavity 13 through a pipeline and a one-way valve 18;
the manual pump 23 is connected with a pipeline water outlet;
the temperature measuring probe (not shown) is arranged in the stainless steel shell cavity 13;
the first temperature and pressure sensor 16 and the second temperature and pressure sensor 24 are respectively arranged on the water inlet and the water outlet;
the first heater, the second metering pump 17, the first temperature and pressure sensor 16 and the second temperature and pressure sensor 24 are all connected with the upper computer 25.
Further, the sampling assembly comprises a back pressure valve 19, a condenser 20, a flow rate meter 21 and a sampling bottle 22;
one end of the flow rate meter 21 is connected with the water outlet through a pipeline, a back pressure valve 19 and a condenser 20 are arranged on the pipeline, the other end of the flow rate meter 21 is connected with the sampling bottle 22 through a pipeline, and a sampling port is arranged on the sampling bottle 22;
the back pressure valve 19 and the flow velocity meter 21 are both connected with the upper computer 25.
The application also aims to provide an interpretation method for inverting core seepage heat transfer of the experimental system, which specifically comprises the following steps:
s1) selecting a core to be measured, and placing the core to be measured in a holder assembly;
s2) the upper computer 25 regulates the temperature and the pressure through the temperature and pressure control assembly to enable the core to be tested in the clamp holder assembly to be in a high-temperature and high-pressure environment, and meanwhile, the displacement working medium and the tracer are heated and pressurized;
sequentially injecting the heated and pressurized displacement working medium and tracers with different densities into a clamp holder assembly through a sample injection assembly, and collecting the temperature, pressure and flow values of a water inlet and a water outlet and the concentration value of the tracer discharged from the water outlet;
s4) inverting the fracture opening degree b according to the tracer concentration value acquired in the S3);
calculating to obtain core permeability k according to the flow value;
and calculating according to the crack opening b and the water outlet temperature value to obtain the thermal conductivity value R of the core.
The length of the core to be measured in the step S1) is not less than 200mm.
The displacement working medium and the tracer in the S2) are heated to be more than 100 ℃ and pressurized to be more than 20MPa
The temperature of the high-temperature high-pressure environment is 100-200 ℃ and the pressure is 20-80MPa.
The specific process of the S3) is as follows:
continuously injecting the heated and pressurized displacement working medium into a holder assembly, and detecting that the pressure of a water inlet and the flow of a water outlet are stable, wherein a seepage field in the core to be detected reaches a steady state;
s3.2) switching the valve, injecting the heated and pressurized inert solute tracer into the core to be detected, then injecting tritium water/deuterium water/ferroferric oxide-polymer nano tracer into the core to be detected, and collecting the temperature, pressure and flow values of the water inlet and the water outlet and the concentration value of the water outlet tracer in the process of injecting the tracer.
The specific steps of the S4) are as follows:
s4.1) substituting the concentration value of the collected tracer sample according to the S3.2) into the following formula to calculate a crack opening value b, wherein the formula is as follows:
wherein:the porosity of the core matrix, b is the fracture opening degree, eta is the porosity of the core fracture, and D m D is the hydrodynamic dispersion coefficient of the tracer in the core matrix f Is the hydrodynamic dispersion system of the tracer in the rock core fracture, s is the independent variable in the Laplace transformation, h is the rock core diameter, V is the water outlet flow velocity, L is the rock core length, C f The concentration of tracer tested;
s4.2) substituting the water outlet pressure and the water outlet flow value acquired in the step S3.2) into the following formula to calculate the permeability k of the core, wherein the formula is as follows:
wherein: q is the flow rate of the water outlet, mu is the dynamic viscosity coefficient of the fluid, P 2 For the water outlet pressure, P 1 Is the pressure of the water inlet;
s4.3) substituting the temperature value of the water outlet acquired in the step S3.2) and the crack opening value b obtained in the step S4.1) into the following formula to obtain the thermal conductivity R of the core to be measured, wherein the formula is as follows:
wherein: θ is the temperature of the non-dimensionalized effluent, T is the temperature of the water outlet, T r T is the temperature in the cavity of the stainless steel shell w For the water inlet temperature, D t Is the thermal dispersion coefficient of the core, C P，f Specific heat capacity of core ρ f Is the core density.
The tracer comprises tritium water/deuterium water/ferroferric oxide-polymer mixed tracer and inert solute tracer,
examples:
the experimental device for simulating core seepage heat transfer at high temperature and high pressure comprises a sample injection assembly consisting of a first metering pump 1, a displacement working medium intermediate container 3, a replacement bottle 2, a tracer intermediate container 4, a replacement bottle 5 and valves 7-11; a holder assembly consisting of a stainless steel holder 12, a stainless steel housing 14 and a fluororubber sleeve 15; the temperature and pressure control assembly comprises a temperature and pressure sensor 16, a second metering pump 17 and a manual pump 23; the sampling assembly comprises a back pressure valve 19, a condenser 20, a flow rate meter 21 and a sampling port 22.
A method for simulating core seepage heat transfer under high temperature and high pressure includes the steps of 1, collecting a field core sample, or fracturing in a laboratory, or 3D printing to form a long core with the length of more than or equal to 200mm, and placing the core in a fluororubber rubber sleeve 15 and a stainless steel shell 14.
The temperature and pressure of the core are controlled by the temperature and pressure control assembly, and the high-temperature and high-pressure state of the dry and hot rock is simulated, wherein the temperature is usually between 100 and 200 ℃, and the pressure is usually 20 to 80Mpa. The temperature and pressure of the intermediate container and the replacement bottle are controlled by the temperature and pressure control assembly, and after the temperature and pressure are stabilized, the next step is started.
The three-way valves 9 and 11 are opened, so that the displacement working medium intermediate container 3 is connected with the holder assembly, the displacement working medium is injected, the temperature and the pressure of the water inlet and the water outlet of the core are recorded, and the water outlet flow velocity meter 21 displays the flow velocity. If the displacement working medium is insufficient in the displacement working medium, the three-way valve 9 is adjusted so that the first replacement bottle 2 is connected with the holder assembly, and the working medium is injected. And meanwhile, the displacement working medium is supplemented into the displacement working medium intermediate container 3. So as to realize continuous injection of the displacement working medium.
After the flow rate is stable, the three-way valve 9 is closed, the three-way valve 10 is opened, the tracer intermediate container 4 of the tracer is connected with the clamp assembly, and the tracer is injected. The tracer solution comprises deuterium water/tritium water/ferroferric oxide-polymer nanometer tracer with a certain concentration and inert solute tracer with a certain concentration. Two tracer injectionsConcentration is higher than M min The calculation mode is as follows:
M min ＝C min *1.076L 2 hφ m
wherein: c (C) min Is the minimum detection range of the tracer, L is the length of the core, h is the diameter of the core, phi m Is the core matrix porosity.
And collecting a tracer sample from the water outlet, and detecting the concentration of the tracer.
The fracture opening b is determined by fitting the concentration variation of the tracer sample.
Wherein:the porosity of the core matrix, b is the fracture opening degree, eta is the porosity of the core fracture, and D m D is the hydrodynamic dispersion coefficient of the tracer in the core matrix f For the hydrodynamic dispersion of the tracer in the core fracture, s is the argument in the Laplace transformation, h is the core diameter, V is the flow velocity, L is the core length, C f The concentration of tracer tested.
The permeability k of the core is analyzed by changing the pressure of the water inlet and outlet ends and the flow of the water outlet of the core, and the formula is as follows:
wherein: r is permeability, Q is water outlet flow, L is core length, h is core diameter, μ is dynamic viscosity coefficient of fluid, P 2 Is the water outlet pressure, P 1 Is the water inlet pressure.
And (5) determining the thermal conductivity R of the core by fitting the temperature change of the water outlet.
Wherein: r is heat conductivity, theta is non-dimensionalized effluent temperature, T is water outlet temperature, T r Is the cavity temperature of the stainless steel shell, T w Is the water inlet temperature, D t Is the thermal dispersion coefficient of the core, b is the crack opening degree, V is the water outlet flow velocity, C P，f Is the specific heat capacity of the core, ρ f Is the rock density.
Through the steps, the crack opening degree, the permeability and the rock heat conductivity of the rock core can be obtained, and the seepage heat transfer process of the rock core is further characterized. The method is helpful for researching the influence of the physical property change of the core on the core seepage heat transfer process, and can be used for researching the influence of the core fracture morphology (fracture opening) on the core heat exchange performance and guiding the efficient exploitation of the dry-hot rock.
The sample injection assembly is used for ensuring that the displacement working medium and the tracer can be continuously injected for a long time until the core permeability is obviously changed, and each intermediate container is provided with a replacement bottle for timely supplementing the displacement working medium. The middle container and the replacement bottle are connected with the clamp holder assembly through the pipeline and the valve, after the use of the displacement working medium in the middle container is finished, the middle container can be connected to the replacement bottle to continuously inject the displacement working medium, and the working medium is supplemented by the disabled middle container. Likewise, the tracer intermediate container is also provided with a replacement bottle.
The holder assembly comprises a fluororubber rubber sleeve, a stainless steel shell and a stainless steel holder, wherein the water inlet end of the holder assembly is connected with the sample feeding assembly, the water outlet end of the holder assembly is connected with the sample feeding assembly, and the lengths of the core and the core holder are not less than 200mm so that obvious temperature gradients from the water inlet end and the water outlet end of the core can be observed. The fluororubber rubber sleeve enables the device to still maintain the rock core in a sealing state under high temperature and high pressure, and isolates the stainless steel shell and the rock core.
The temperature and pressure control assembly is used for controlling the temperature of the rock core and the temperature of the intermediate container respectively, so that the injection of the displacement working medium and the tracer at fixed temperature can be realized. The two parts are respectively: (1) The first heater is connected with the intermediate container and the replacement bottle, and (2) the second heater is connected with the stainless steel shell in the clamp holder assembly through a pipeline, and the two parts can independently control the temperature and the pressure and are not mutually interfered. In order to accurately determine the temperature of the core, but not the temperature of the core sidewall, a temperature probe is mounted within a cavity of a stainless steel housing in the holder assembly.
The sampling assembly is connected with the holder assembly and comprises a flow meter, a condenser and a sampling bottle, and is used for testing the flow rate of the water outlet of the core and collecting the tracer agent of the water outlet of the core and the displacement working medium. In order to collect high-temperature high-pressure liquid in an experiment, a back pressure valve is arranged at a water outlet to control the pressure of the water outlet, and a condenser is arranged to prevent the displacement working medium and the tracer from evaporating.
According to the device, the method for characterizing the seepage heat transfer of the rock core is characterized by using the experimental device to test, the rock core is maintained in a high-temperature and high-pressure state through the temperature and pressure control assembly, the displacement working medium with fixed temperature is injected into the rock core, after the flow rate is stable, two tracers with fixed temperature and concentration, namely tritium water/deuterium water/ferroferric oxide-polymer nano tracers and an inert solute tracer are injected. Monitoring the temperature, pressure, flow and flow rate of the water inlet and the water outlet of the core, collecting and testing the tracer agent at the water outlet, and inverting the fracture opening according to the concentration change of the tracer agent; determining the permeability change of the core according to the flow change; further, according to the temperature change of the water outlet, the thermal conductivity of the core is represented, and the flow of the method is shown in figure 2.
The crack opening degree is obtained according to the following steps: the tracer is mixed with deuterium/tritium water/ferroferric oxide-polymer nanometer tracer with certain concentration and any inert solute tracer, such as potassium chloride and sodium fluorescein. Injecting the tracer into a rock core, obtaining the concentration change of the tracer at a water outlet, and drawing the tracer into a curve which changes with time. The migration law of the tracer can be described by the following equation.
Wherein:the porosity of the core matrix, b is the fracture opening degree, eta is the porosity of the core fracture, and D m D is the hydrodynamic dispersion coefficient of the tracer in the core matrix f For the hydrodynamic dispersion coefficient of the tracer in the core fracture, V is the water outlet flow velocity, C f For the tracer concentration tested, C m Is the concentration of tracer in the core matrix.
Solving the equation to obtain the Laplace solution of the equation, and adjusting:
wherein: l is the core length, s is the argument in the laplace transform, and h is the core diameter.
Unknown parameters b and D represented by the above equation m Relationship with tracer concentration curve, water outlet flow rate, core fracture and matrix hydrodynamic dispersion coefficient, parameters b and D m The determination of (2) requires fitting by mathematical means. From the above equation, tritium water/deuterium water/ferroferric oxide-polymer nanotracers and any other inert solute tracer concentration profile C are obtained f1 And C f2 The representation shows that unknown parameters b and D can be determined by testing the physical parameters of the rock core and the dispersion coefficient of the solute m 。
The permeability k of the core is analyzed by changing the pressure of the water inlet and outlet ends and the flow of the water outlet of the core, and the formula is as follows
Wherein: r is permeability, Q is water outlet flow, mu is dynamic viscosity coefficient of fluid, P 2 Is the water outlet pressure, P 1 Is the water inlet pressure.
Obtaining rock heat conductivity R change by fitting rock core displacement working medium water outlet temperature change T (T)
Wherein: r is heat conductivity, theta is non-dimensionalized effluent temperature, T is water outlet temperature, T r Is the cavity temperature of the stainless steel shell, T w Is the water inlet temperature, D t Is the thermal dispersion coefficient of the core, b is the crack opening degree, V is the water outlet flow velocity, C P，f Is the specific heat capacity of the core, ρ f Is the rock density, the horizontal line is the inverse laplace transform of the parameter, and ln is log.
The relation between the thermal conductivity R of the solving parameter and the water inlet and outlet temperature and the crack opening degree expressed by the equation,
the experimental device and the interpretation method for simulating core seepage heat and mass transfer under high temperature and high pressure provided by the embodiment of the application are described in detail. The above description of embodiments is only for aiding in the understanding of the method of the present application and its core ideas; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present application, the present description should not be construed as limiting the present application in view of the above.
Certain terms are used throughout the description and claims to refer to particular components. Those of skill in the art will appreciate that a hardware manufacturer may refer to the same component by different names. The description and claims do not take the form of an element differentiated by name, but rather by functionality. As referred to throughout the specification and claims, the terms "comprising," including, "and" includes "are intended to be interpreted as" including/comprising, but not limited to. By "substantially" is meant that within an acceptable error range, a person skilled in the art is able to solve the technical problem within a certain error range, substantially achieving the technical effect. The description hereinafter sets forth a preferred embodiment for practicing the application, but is not intended to limit the scope of the application, as the description is given for the purpose of illustrating the general principles of the application. The scope of the application is defined by the appended claims.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a product or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such product or system. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a commodity or system comprising such elements.
It should be understood that the term "and/or" as used herein is merely one relationship describing the association of the associated objects, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
While the foregoing description illustrates and describes the preferred embodiments of the present application, it is to be understood that the application is not limited to the forms disclosed herein, but is not to be construed as limited to other embodiments, and is capable of numerous other combinations, modifications and environments and is capable of changes or modifications within the scope of the inventive concept as expressed herein, either as a result of the foregoing teachings or as a result of the knowledge or technology of the relevant art. And that modifications and variations which do not depart from the spirit and scope of the application are intended to be within the scope of the appended claims.
Claims (3)
1. An interpretation method for inversion core seepage heat transfer of an experimental system for simulating core seepage heat transfer and mass transfer under high temperature and high pressure, wherein the experimental system adopted by the interpretation method comprises the following steps:
the sample injection assembly is used for storing the displacement working medium and the tracer and sequentially injecting the displacement working medium and the tracer into the core to be detected;
the holder assembly is used for keeping the core to be measured stable and suspending and holding the core to be measured in a closed environment;
the temperature and pressure control assembly is used for controlling the temperature, injection pressure/flow of the displacement working medium and the tracer agent and the temperature and pressure inside the clamp holder assembly so as to form a high-temperature and high-pressure environment inside the clamp holder assembly;
the sampling assembly is used for collecting the parameter value of the water outlet of the clamp holder assembly;
the upper computer is used for controlling the sample injection assembly, the temperature and pressure control assembly and the sampling assembly and analyzing and interpreting the acquired data;
the sample injection assembly comprises a first metering pump, a displacement working medium intermediate container, a tracer intermediate container, a first replacement bottle, a second replacement bottle, a first three-way valve, a second three-way valve, a third three-way valve, a fourth three-way valve, a fifth three-way valve and a sixth three-way valve; the first metering pump is connected with a second three-way valve and a third three-way valve through a pipeline and a first three-way valve respectively, and the second three-way valve and the third three-way valve are connected with one end of a second replacement bottle of the displacement working medium intermediate container, the tracer intermediate container and the first replacement bottle respectively;
the other ends of the displacement working medium intermediate container, the tracer intermediate container, the first replacement bottle and the second replacement bottle are connected with a fourth three-way valve and a fifth three-way valve through pipelines, and the fourth three-way valve and the fifth three-way valve are connected with a sixth three-way valve; the first metering pump, the first three-way valve, the second three-way valve, the third three-way valve, the fourth three-way valve, the fifth three-way valve and the sixth three-way valve are all in control connection with the upper computer; the gripper assembly includes: stainless steel holder, stainless steel shell and fluororubber rubber sleeve;
the stainless steel shell is arranged at the center of the stainless steel clamp holder, the fluororubber sleeve is hollow and cylindrical in the interior and is used for placing a rock core, the fluororubber sleeve is arranged in the stainless steel shell, a water inlet and a water outlet are respectively arranged at two ends of the stainless steel shell, the water inlet is connected with the sixth three-way valve through a pipeline, and the water outlet is connected with the sampling assembly through a pipeline;
the temperature and pressure control assembly comprises a first heater, a second metering pump, a manual pump, a one-way valve, a temperature measuring probe, a first temperature and pressure sensor and a second temperature and pressure sensor;
the first heater is respectively connected with the displacement working medium middle container, the tracer middle container, the first replacement bottle and the second replacement bottle;
the first heater is connected with the intermediate container and the replacement bottle through pipelines and valves;
the second heater is arranged inside the stainless steel shell;
the second metering pump is communicated with the stainless steel shell cavity through a pipeline and a one-way valve;
the manual pump is connected with the water outlet through a pipeline and a valve;
the temperature measuring probe is arranged in the stainless steel shell cavity;
the first temperature and pressure sensor and the second temperature and pressure sensor are respectively arranged on the water inlet and the water outlet;
the first heater, the second metering pump, the first temperature and pressure sensor and the second temperature and pressure sensor are all connected with the upper computer;
the sampling assembly comprises a back pressure valve, a condenser, a flow rate meter and a sampling bottle;
one end of the flow velocity meter is connected with the water outlet through a pipeline, a back pressure valve and a condenser are arranged on the pipeline, the other end of the flow velocity meter is connected with the sampling bottle through a pipeline, and a sampling port is arranged on the sampling bottle; the back pressure valve and the flow velocity meter are connected with the upper computer; the method is characterized by comprising the following steps of:
s1) selecting a core to be measured, and placing the core to be measured in a holder assembly;
s2) the upper computer regulates the temperature and the pressure through the temperature and pressure control assembly to enable the core to be detected in the clamp holder assembly to be in a high-temperature and high-pressure environment, and meanwhile, the displacement working medium and the tracer are heated and pressurized;
s3) sequentially injecting the heated and pressurized displacement working medium and tracers with different densities into a clamp holder assembly through a sample injection assembly, and collecting the temperature, pressure and flow values of a water inlet and a water outlet and the concentration value of the tracer discharged from the water outlet;
s3), the specific process is as follows:
s3.1) continuously injecting the heated and pressurized displacement working medium into a holder assembly, and detecting that the pressure of a water inlet and the flow of a water outlet are stable, wherein a seepage field in the core to be detected reaches a steady state;
s3.2) switching the valve, sequentially injecting heated and pressurized tracers with different densities into the core to be detected, and collecting the temperature, pressure and flow values of the water inlet and the water outlet and the concentration value of the tracer at the water outlet in the process of injecting the tracers;
s4) inverting the fracture opening degree b according to the tracer concentration value acquired in the S3);
calculating to obtain core permeability k according to the flow value;
calculating to obtain a thermal conductivity value R of the core according to the crack opening b and the water outlet temperature value;
s4), the specific steps are as follows:
s4.1) substituting the concentration value of the collected tracer sample according to the S3.2) into the following formula to calculate a crack opening value b, wherein the formula is as follows:
wherein:the porosity of the core matrix, b is the fracture opening degree, eta is the porosity of the core fracture, and D m D is the hydrodynamic dispersion coefficient of the tracer in the core matrix f Is the hydrodynamic dispersion system of the tracer in the rock core fracture, s is the independent variable in the Laplace transformation, h is the rock core diameter, V is the water outlet flow velocity, L is the rock core length, C f The concentration of tracer tested;
s4.2) substituting the water outlet pressure and the water outlet flow value acquired in the step S3.2) into the following formula to calculate the permeability k of the core, wherein the formula is as follows:
wherein: k is permeability, Q is water outlet flow, mu is dynamic viscosity coefficient of fluid, P 2 For the water outlet pressure, P 1 Is the pressure of the water inlet;
s4.3) substituting the temperature value of the water outlet acquired in the step S3.2) and the crack opening value b obtained in the step S4.1) into the following formula to obtain the thermal conductivity K of the core to be measured, wherein the formula is as follows:
wherein: k is heat conductivity, theta is temperature of non-dimensionalized effluent liquid, T is water outlet temperature, T r T is the temperature in the cavity of the stainless steel shell w For the water inlet temperature, D t The thermal dispersion coefficient of the core, b is the crack opening degree, C P，f Specific heat capacity of core, P f Is the core density.
2. The method of claim 1, wherein the length of the core to be measured in S1) is not less than 200mm.
3. The method of claim 1, wherein the displacement medium and tracer in S2) are heated to above 100 ℃; pressurizing to above 20 Mpa;
the temperature of the high-temperature high-pressure environment is 100-200 ℃ and the pressure is 20-80Mpa.
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