CN112834405A - Method and device for testing permeability of rock core overburden pressure matrix - Google Patents
Method and device for testing permeability of rock core overburden pressure matrix Download PDFInfo
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- 238000012360 testing method Methods 0.000 title claims abstract description 118
- 239000011159 matrix material Substances 0.000 title claims abstract description 53
- 230000035699 permeability Effects 0.000 title claims abstract description 53
- 239000011435 rock Substances 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 27
- 230000008859 change Effects 0.000 claims abstract description 41
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 20
- 230000008569 process Effects 0.000 claims abstract description 16
- 238000005086 pumping Methods 0.000 claims abstract description 12
- 238000010998 test method Methods 0.000 claims abstract description 12
- 238000009423 ventilation Methods 0.000 claims description 9
- 230000036961 partial effect Effects 0.000 claims description 4
- 238000001179 sorption measurement Methods 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 description 14
- 238000013022 venting Methods 0.000 description 13
- 230000001276 controlling effect Effects 0.000 description 12
- 230000006870 function Effects 0.000 description 7
- 238000012545 processing Methods 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 238000004891 communication Methods 0.000 description 4
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- 238000005259 measurement Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000005273 aeration Methods 0.000 description 1
- 238000005276 aerator Methods 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000013100 final test Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
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- 238000002459 porosimetry Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
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- 230000036962 time dependent Effects 0.000 description 1
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
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Abstract
The application provides a method and a device for testing permeability of a rock core overburden pressure matrix. The test method of the permeability of the rock core overburden matrix comprises the following steps: controlling the pressure around the core to be tested to a target pressure (simulated formation pressure); pumping out gas in the rock core to be tested; introducing test gas with preset pressure into the rock core to be tested, and acquiring pressure change information of the rock core to be tested in the process of introducing the test gas; and determining the matrix permeability of the rock core to be tested under the simulated formation pressure condition according to the pressure change information. The test method is used for realizing the test of the permeability of the overburden matrix of the rock core.
Description
Technical Field
The application relates to the technical field of geological testing, in particular to a method and a device for testing permeability of a rock core overburden pressure matrix.
Background
Permeability is an important petrophysical property, and includes apparent permeability and matrix permeability. The matrix permeability represents the capacity of fluid release inside the pore medium and is an important technical parameter in the shale gas exploitation process.
Currently, overburden pulse permeability (or apparent permeability) of a core can be measured by overburden porosimetry, but overburden matrix permeability of a core has not been measured.
Disclosure of Invention
An object of the embodiments of the present application is to provide a method and an apparatus for testing permeability of overburden matrix of a core, so as to test the permeability of overburden matrix of the core.
In a first aspect, an embodiment of the present application provides a method for testing permeability of a core overburden matrix, including: controlling the pressure around the core to be tested to a target pressure; the target pressure represents a simulated formation pressure; pumping out gas in the rock core to be tested; introducing test gas with preset pressure into the rock core to be tested, and acquiring pressure change information of the rock core to be tested in the process of introducing the test gas; and determining the matrix permeability of the rock core to be tested under the simulated formation pressure condition according to the pressure change information.
In the embodiment of the application, compared with the prior art, the gas in the core to be tested is pumped out firstly, and then the pressurization is carried out; the matrix of the core is a rigid framework, and a gap is arranged in the middle of the framework and is communicated with the framework to form a channel; by pumping out the gas and re-pressurizing, the added test gas can be ensured to enter the matrix of the rock core (namely, the direct pressurization of the matrix is realized), the finally obtained pressure change information is the pressure change information corresponding to the matrix, and the matrix permeability (namely, the overburden matrix permeability) of the rock core to be tested under the simulated formation pressure condition can be determined based on the pressure change information, so that the testing of the overburden matrix permeability is realized.
As a possible implementation manner, the determining the matrix permeability of the core to be tested under the simulated formation pressure condition according to the pressure change information includes: by the formula:
calculating the matrix permeability of the core to be tested under the simulated formation pressure condition; wherein L is the predetermined length of the core to be tested; phi is the predetermined porosity of the core to be tested; kaIs a partial derivative of a predetermined adsorbed phase density relative to the test gas density; μ is a preset kinetic viscosity of the test gas; c. CgTo a predetermined density of the test gasA compression factor; s1Fitting a slope to a line determined from the pressure change information; alpha is alpha1For a predetermined transcendental equation tan α of 3 α/(3+ K)cα2) The first solution of (a); wherein, KcIs the ratio of the volume of gas expected to be passed into the core to be tested to the volume of gas absorbable by the core to be tested.
According to the method and the device, the pressure change information and the predetermined parameter information are combined, so that the matrix permeability of the rock core to be tested can be accurately tested.
In a second aspect, an embodiment of the present application provides a device for testing permeability of a core overburden matrix, the device being configured to implement the testing method described in the first aspect and any one of the possible implementations of the first aspect, and the device includes: the core fixing device is used for fixing a core to be tested; the pressurization device is used for controlling the pressure around the core to be tested to a target pressure; the target pressure represents a simulated formation pressure; the vacuum device is used for pumping out gas in the rock core to be tested; the ventilation device is used for introducing test gas with preset pressure into the core to be tested; collecting pressure change information of the rock core to be tested in the process of introducing the test gas; and the computer is connected with the ventilation device and used for determining the matrix permeability of the core to be tested under the condition of the simulated formation pressure according to the pressure change information.
In the embodiment of the application, a core to be tested is fixed through a core fixing device, the pressure around the core to be tested is controlled through a pressurizing device, the pressure change information acquisition of the core to be tested is realized through a ventilating device, and the matrix permeability calculation based on the pressure change information is realized through a computer; and finally, testing the permeability of the overburden matrix of the rock core.
As a possible implementation, the supercharging apparatus includes: a booster pump for increasing the pressure around the core to be tested; and the first pressure gauge is used for being connected with the core to be tested and acquiring the pressure around the core to be tested.
In this application embodiment, increase pressure through the booster pump, gather pressure through first manometer, realize controllable pressure boost.
As a possible implementation manner, the booster pump is further provided with a first valve, the first valve is connected with the computer, and the computer is further used for controlling the opening or closing of the first valve.
In the embodiment of the application, the control of the pressurization of the rock core to be tested is realized by controlling the first valve through the computer.
As a possible implementation, the booster pump and the first pressure gauge are placed in a thermostat.
In this application embodiment, through placing booster pump and first manometer in the thermostat, realize the thermostatic control of booster pump and first manometer.
As a possible implementation, the ventilation device comprises: the gas source, the reference cup and the second pressure gauge; the gas source is used for introducing test gas into the reference cup; the test gas in the reference cup is used for being introduced into the core to be tested; the second pressure gauge is connected with the computer, is arranged close to the reference cup, and is used for monitoring the pressure introduced into the reference cup to be the preset pressure, acquiring the pressure change information when the test gas is introduced into the core to be tested, and sending the pressure change information to the computer.
In the embodiment of the application, the reference cup is equivalent to a pressure transition device (the test gas introduced into the core to be tested is the test gas in the reference cup), the second pressure gauge is equivalent to a pressure measuring device, and the test gas introduced into the core to be tested can be ensured to be the preset pressure through the arrangement of the reference cup and the second pressure gauge.
As a possible implementation manner, a second valve is arranged between the gas source and the reference cup, the second valve is connected with the computer, and the computer is further used for controlling the opening or closing of the second valve.
In this application embodiment, through the setting of second valve, can realize the control of the intercommunication or the disconnection of gas source and the rock core that awaits measuring, avoid when need not ventilating, the gas in the gas source produces the influence to the pressure in the rock core that awaits measuring, improves the precision of the matrix permeability of the overpressure that finally calculates.
As a possible implementation manner, a third valve is arranged between the reference cup and the rock core to be tested, the third valve is connected with the computer, and the computer is further used for controlling the opening or closing of the third valve.
In the embodiment of the application, the connection or disconnection of the reference cup and the rock core to be tested can be controlled by the arrangement of the third valve, so that the influence of the pressure in the reference cup on the pressure in the rock core to be tested is avoided when the action of the reference cup is not needed, and the accuracy of the finally calculated permeability of the overburden pressure matrix is improved.
As a possible implementation, the reference cup and the second pressure gauge are placed in an oven.
In the embodiment of the application, the reference cup and the second pressure gauge are placed in the thermostat, so that the constant temperature control of the reference cup and the second pressure gauge is realized.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
FIG. 1 is a flow chart of a testing method provided by an embodiment of the present application;
FIG. 2 is a schematic diagram of a first embodiment of a testing apparatus provided in an embodiment of the present application;
fig. 3 is a schematic diagram of a second implementation manner of a testing apparatus provided in an embodiment of the present application.
Icon: 200-a test device; 210-core securing means; 211-core holder; 220-a pressure boosting device; 221-a first pressure gauge; 222-a first valve; 223-a booster pump; 230-a vacuum device; 231-a vacuum pump; 232-exhaust valve; 240-an aerator; 241-a gas cylinder; 242-a second valve; 243-a second pressure gauge; 244-reference cup; 245-a third valve; 250-a computer; 260-core to be tested.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.
The embodiment of the application provides a test method and a test device for permeability of a rock core overburden pressure matrix, wherein the test method can be independent of the test device, namely, other implementable test devices can be adopted by utilizing the implementation principle of the test method. If the test device of the application is adopted in the test method, the implementation effect is better. In the embodiment of the present application, in order to facilitate understanding of the test method and the test apparatus, the test method is described first, and then the test apparatus is described in combination with the test method.
Referring to fig. 1, a flow chart of a method for testing permeability of a core overburden matrix according to an embodiment of the present application is shown, the method including: step 110, step 120, step 130 and step 140.
Step 110: the pressure around the core to be tested is controlled to a target pressure. The target pressure represents the simulated formation pressure.
Step 120: and pumping out the gas in the core to be tested.
Step 130: and introducing test gas with preset pressure into the rock core to be tested, and acquiring pressure change information of the rock core to be tested in the process of introducing the test gas.
Step 140: and determining the matrix permeability of the rock core to be tested under the simulated formation pressure condition according to the pressure change information.
In the embodiment of the application, compared with the prior art, the gas in the core to be tested is pumped out firstly, and then the pressurization is carried out; the matrix of the core is a rigid framework, and a gap is arranged in the middle of the framework and is communicated with the framework to form a channel; by pumping out the gas and re-pressurizing, the added test gas can be ensured to enter the matrix of the rock core (namely, the direct pressurization of the matrix is realized), the finally obtained pressure change information is the pressure change information corresponding to the matrix, and the matrix permeability (namely, the overburden matrix permeability) of the rock core to be tested under the simulated formation pressure condition can be determined based on the pressure change information, so that the testing of the overburden matrix permeability is realized.
In the embodiment of the application, for the core to be tested, the test is realized through the control of the pressure, and therefore, the test method needs to be executed in a relatively closed space, namely, the test environment corresponding to the test method is a relatively closed environment.
In the implementation of the application, the pressure applied to the core to be tested is equivalent to the simulated formation pressure, and the final test result can represent the overburden matrix permeability of the core under a certain formation pressure.
In step 110, controlling the pressure to the target pressure may be achieved by a pressure increasing device or a pressure decreasing device, etc. How the pressure is controlled depends on the initial magnitude of the pressure around the core to be tested, and if the pressure around the core to be tested is small, the pressure around the core to be tested can be increased by the pressure increasing means. If the pressure around the core to be tested is relatively high, the pressure around the core to be tested can be reduced by means of the pressure reduction device. Correspondingly, the target pressure value is a more appropriate pressure value which is changed relative to the initial pressure value.
In step 120, the extraction of gas inside the core to be tested may be achieved by means of a gas extraction device. Such as: the internal gas is extracted by an air pump, a vacuum pump, or the like. When gas is pumped out, the gas pumping device can be connected to the interior of the core to be tested through the corresponding connecting pipe so as to realize the gas pumping of the interior of the core to be tested. When air is pumped out, the air pumping time can be reasonably set so as to ensure that the internal air is completely pumped out. The gas inside the core to be tested includes, but is not limited to: adsorbed gas and free gas inside.
In step 130, the predetermined pressure is determined by the pressure value that the core to be tested can withstand. The test gas may be the adsorbed gas and the free gas described in the previous examples. In the process of introducing gas, pressure change information of the rock core to be tested, namely, each pressure value corresponding to different moments, can be acquired through a pressure gauge connected with the rock core to be tested.
In step 140, the overburden matrix permeability of the core under test is determined using the collected pressure change information. The determination process may be implemented by an electronic device having a data processing function.
As an alternative embodiment, the determination process includes: by the formula:
calculating the overburden matrix permeability of the core to be tested; wherein L is the predetermined length of the core to be tested; phi is the predetermined porosity of the core to be tested; kaPresetting the partial derivative of the adsorption phase density relative to the gas phase density of the test gas; mu is the preset dynamic viscosity of the test gas; c. CgThe preset density compression factor of the test gas; s1Fitting a slope to the line determined from the pressure change information; alpha is alpha1For a predetermined transcendental equation tan α of 3 α/(3+ K)cα2) The first solution of (a); wherein, KcIs the ratio of the volume of gas expected to be passed into the core to be tested to the volume of gas absorbable by the core to be tested.
The predetermined or preset manner of each parameter depends on the selected test gas and the embodiment of the testing device, so that a detailed embodiment of the calculation process will not be described here, and will be described in combination when the testing device is described later.
According to the method and the device, the accurate test of the overburden pressure matrix permeability of the rock core to be tested can be realized by combining the pressure change information with each predetermined parameter information.
Referring next to fig. 2, a schematic diagram of a testing apparatus 200 according to an embodiment of the present disclosure is provided, in which the testing apparatus 200 includes: the core fixture 210, the pressurization device 220, the vacuum device 230, the venting device 240, and the computer 250, in fig. 2, further include a core 260 to be tested.
Wherein the core fixture 210 is used to fix a core 260 to be tested. The pressurization device 220 is used to control the pressure around the core 260 to be tested to a target pressure. The vacuum device 230 is used to evacuate gas from the interior of the core 260 to be tested. The venting device 240 is used for venting a test gas with a preset pressure into the core 260 to be tested, and collecting pressure change information of the core 260 to be tested in the process of venting the test gas. The computer 250 is used to determine the overburden matrix permeability of the core 260 to be tested based on the pressure change information.
In the embodiment of the application, a core 260 to be tested is fixed by a core fixing device 210, the pressure around the core 260 to be tested is controlled by a pressurizing device 220, the pressure change information acquisition of the core 260 to be tested is realized by a ventilating device 240, and the overpressure matrix permeability calculation based on the pressure change information is realized by a computer 250; finally, the overburden matrix permeability of the core 260 to be tested is tested.
Next, embodiments of the respective devices of the test device 200 will be described.
The core holding device 210, which functions to directly hold the core 260 to be tested, may also function to connect the pressurizing device 220, the vacuum device 230, and the venting device 240 to the core 260 to be tested.
Thus, as an alternative embodiment, the core holding device 210 is a core holder comprising two holding ends (a first holding end and a second holding end) between which a core 260 (generally elongated) to be tested is held. At both ends of the core holder, corresponding connection channels may be provided for communication of the pressure boosting device 220, the vacuum device 230 and the venting device 240 with the core 260 to be tested, such as: the ventilating device 240 enables the corresponding connecting pipe to be communicated with the core to be tested 260 through the connecting channel of the first clamping end; the vacuum device 230 communicates the corresponding connection tube with the core 260 to be tested through the connection channel of the second clamping end.
Furthermore, both the core fixture 210 and the core 260 to be tested may be placed in an incubator.
A pressure boosting device 220, which functions to increase the pressure around the core 260 to be tested. As an alternative embodiment, the pressure boosting device 220 includes a pressure boosting pump and a first pressure gauge. The booster pump is used for increasing the pressure around the core 260 to be tested, and the first pressure gauge can be connected with the core 260 to be tested and collects the pressure value around the core 260 to be tested. When connecting, can be earlier with the booster pump with await measuring the rock core 260 is connected, be connected to the centre of booster pump and the rock core that awaits measuring again with first manometer, and then, when utilizing the booster pump to carry out the pressure boost, pressure value around the rock core 260 that awaits measuring can be gathered in real time to first manometer, and when reaching target pressure, the booster pump stops the pressure boost.
The influence of the pressure value monitored by the first pressure gauge on the finally calculated permeability is small, so that the precision requirement of the first pressure gauge can be low, and only a common pressure gauge is adopted. The booster pump can be a hand-held booster pump.
As an alternative embodiment, the booster pump is provided with a first valve for controlling the opening or closing of the booster pump. And controlling the opening degree of the booster pump, and further adjusting the boosting rate of the booster pump, such as: the more the first valve is opened, the faster the pressurization rate is; the smaller the first valve is opened, the slower the rate of pressurization.
The first valve can be a manual regulating valve or an electric regulating valve. If the first valve is an electric control valve, the first valve is also connected to the computer 250, and the computer 250 can realize the automatic opening or closing of the first valve, the control of the opening degree, and the like through a valve control program.
Further, if the first valve is an electrically-operated regulator valve, the entire portions of the pressure increasing means 220 (i.e., the booster pump, the first pressure gauge, and the first valve) may be placed in an oven, and thermostatic control of the oven may be performed by the computer 250. If the first valve is a manual regulating valve, the manual regulating valve can be externally connected, and then the booster pump and the first pressure gauge are placed in the constant temperature box.
It should be noted that, for the booster pump, a connecting pipe is usually provided, so that the connecting pipe of the booster pump can be directly connected to the core 260 to be tested, and then the first valve (usually, the valve of the booster pump is provided, and the valve can be used as the first valve) is provided.
The vacuum device 230, whose function is to pump the core 260 to be tested, may include: a vacuum pump and an exhaust valve. The vacuum pump is used for realizing evacuation, and the discharge valve is used for controlling opening or closing of vacuum pump to and the degree of opening of control vacuum pump, and then adjusts the pump-down rate of vacuum pump, for example: the more the exhaust valve is opened, the faster the air exhaust rate is; the smaller the exhaust valve is opened, the slower the pumping rate.
The exhaust valve can be a manual regulating valve or an electric regulating valve. If the exhaust valve is an electric regulating valve, the exhaust valve is also connected with the computer 250, and the computer 250 can realize the automatic opening or closing of the exhaust valve and the control of the opening degree through a valve control program.
Furthermore, if the exhaust valve is an electrically operated regulating valve, the exhaust valve may be placed in an incubator, the vacuum pump being placed outside the incubator, and the thermostatic control of the incubator may be realized by a computer. If the exhaust valve is a manual adjusting valve, the manual adjusting valve can be externally connected, and the vacuum pump is placed in the constant temperature box.
It should be noted that, for the vacuum pump, a connection pipe is usually provided, so that the vacuum pump can be directly connected to the core 260 to be tested, and then an exhaust valve (usually, the vacuum pump is provided with an exhaust valve) is provided.
A venting device 240 for effecting the venting of a test gas into a core 260 to be tested, the venting device 240 comprising, as an alternative embodiment: the gas source, the reference cup and the second pressure gauge. The gas source is used for introducing test gas into the reference cup, namely providing the test gas. The test gas in the reference cup is used for the passage into the core 260 to be tested, i.e. the reference cup corresponds to a transitional test gas container. The second pressure gauge is connected to the computer 250, is disposed near the reference cup, and is configured to monitor a pressure introduced into the reference cup as a preset pressure, and acquire pressure change information when the test gas is introduced into the core 260 to be tested, and send the pressure change information to the computer 250. That is, the second pressure gauge is used to detect the pressure from the gas source to the core 260 to be tested.
The gas source may be a gas bottle, a gas tank, or the like, or other container for holding gas.
The embodiment of the reference cup depends on a preset pressure, and the volume of the reference cup, i.e. the volume of the test gas expected to be introduced, can be calculated from the relation between the preset pressure and the density of the test gas. By means of the reference cup, controllability of the test gas introduced into the core 260 to be tested can be achieved. In practice, the test gas may be introduced into the reference cup before the test gas is introduced into the core 260 to be tested. It should be noted that when the test gas in the reference cup is passed into the core to be tested, the gas source and the reference cup should be disconnected, i.e. no gas passage is formed. When the test gas is introduced into the reference cup, the connection between the reference cup and the core 260 to be tested should be broken.
Thus, to fulfill the gas path requirements of both processes, as an alternative embodiment, a second valve is provided between the gas source and the reference cup. This second valve may be used to control the disconnection or connection between the reference cup and the gas source. And controlling the rate of passage of the test gas from the gas source, such as: the more the second valve is opened, the faster the venting rate; the smaller the second valve is opened, the slower the venting rate.
The second valve may be a manual regulating valve or an electric regulating valve. If the second valve is an electric control valve, the second valve is also connected to the computer 250, and the computer 250 can realize the automatic opening or closing of the second valve, the control of the opening degree, and the like through a valve control program.
In addition, if the second valve is an electrically-actuated regulator valve, both the second valve and the reference cup can be placed in the incubator for thermostatic control by the computer 250. If the second valve is a manual adjustment valve, the manual adjustment valve can be externally connected and then the reference cup is placed in the incubator.
Further, as an alternative embodiment, a third valve is provided between the reference cup and the core 260 to be tested, and the third valve can be used to control the disconnection or connection between the reference cup and the core 260 to be tested. And controlling the rate at which the test gas in the reference cup is passed into the core 260 to be tested, such as: the more the third valve is opened, the faster the venting rate; the smaller the third valve is opened, the slower the venting rate.
The third valve may be a manual regulating valve or an electric regulating valve. If the third valve is an electric control valve, the third valve is also connected to the computer 250, and the computer 250 can implement automatic opening or closing of the third valve, control of the opening degree, and the like through a valve control program.
In addition, if the third valve is an electrically actuated regulator valve, both the third valve and the reference cup can be placed in the incubator for thermostatic control by the computer 250. If the third valve is a manual regulating valve, the manual regulating valve can be externally connected, and then the reference cup is placed in the incubator.
It should be noted that, in the foregoing embodiment, the ventilation process is also implemented by using a connection tube (such as a ventilation tube) dedicated for ventilation. Typically, the gas source is provided with a connecting tube, such as: when connected, the connection tube may be connected to the reference cup and then a second valve may be installed in place of the connection tube. Communication between the reference cup and the core 260 to be tested may be achieved by a separate connecting tube, to which a third valve is then fitted in place.
For the second pressure gauge, because the pressure change information in the ventilation process needs to be acquired, and the influence of the pressure change information on the calculation of the final permeability is large, the second pressure gauge can adopt a high-precision pressure gauge.
The computer 250, which may be understood as a control center of the entire testing apparatus 200, is used to implement the control of the valves and the processing of data. The first pressure gauge and the second pressure gauge can be connected to the computer 250, and the data collected by the first pressure gauge and the second pressure gauge are transmitted to the computer 250 in real time. The computer 250 may be a conventional computer 250, or a computer 250 separately developed to implement a corresponding data processing function, and the function of the computer 250 is adapted to the test apparatus 200, for example: and displaying the pressure value, the finally measured permeability and the like on the user interface in real time.
The computer 250 may include internally: memory, input-output module, processor, communication module, display, and the like. The processor, the communication module, the memory, the input/output module and the display may be connected by a bus.
The Memory may include, but is not limited to, RAM (Random Access Memory), ROM (Read Only Memory), PROM (Programmable Read-Only Memory), EPROM (Erasable Programmable Read-Only Memory), EEPROM (electrically Erasable Programmable Read-Only Memory), and the like.
The bus may be an ISA (Industry Standard Architecture) bus, a PCI (Peripheral Component Interconnect) bus, an EISA (Enhanced Industry Standard Architecture) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc.
The processor may be an integrated circuit chip having signal processing capabilities. The Processor may be a general-purpose Processor including a CPU (Central Processing Unit), an NP (Network Processor), and the like; but may also be a digital signal processor, an application specific integrated circuit, an off-the-shelf programmable gate array or other programmable logic device, discrete gate or transistor logic, discrete hardware components.
The components and configurations of computer 250 described in the embodiments of the present application are exemplary only, and not limiting, as computer 250 may have other components and configurations as desired.
As described in the foregoing embodiments, some of the components of the testing device 200 may be placed in an incubator, and as an embodiment, other components may be placed in the incubator, in addition to the gas source, the computer 250, and the vacuum pump. Of course, if the valves therein are manual valves, the corresponding valves are not placed in the thermostat.
Referring to fig. 3, a testing apparatus 200 according to an embodiment of the present application is an alternative embodiment in practical application, where in fig. 3, the testing apparatus 200 includes: a gas cylinder 241, a computer 250, a vacuum pump 231, a second valve 242, a second pressure gauge 243, a reference cup 244, a third valve 245, an exhaust valve 232, a core holder 211, a core to be tested 260, a first pressure gauge 221, a first valve 222 and a booster pump 223.
Wherein the second valve 242, the second pressure gauge 243, the reference cup 244, the third valve 245, the exhaust valve 232, the core holder 211, the core 260 to be tested, the first pressure gauge 221, the first valve 222 and the booster pump 223 are all placed in the incubator.
The gas cylinder 241 is connected with a second valve 242, the second valve 242 is connected with a second pressure gauge 243, the second pressure gauge 243 is arranged between the gas cylinder 241 and a reference cup 244, and a third valve 245 is arranged between the reference cup 244 and the rock core 260 to be tested. The booster pump 223 is connected to the core 260 to be tested, and a first valve 222 and a first pressure gauge 221 are disposed therebetween. The vacuum pump 231 is connected with the core 260 to be tested, and an exhaust valve 232 is arranged between the vacuum pump 231 and the core 260 to be tested. The computer 250 may be connected to the first valve 222, the second valve 242, the third valve 245, the first pressure gauge 221, and the second pressure gauge 243.
Correspondingly, based on the structure shown in fig. 3, the flow of the corresponding testing method includes:
first, a core 260 to be tested is placed in the core holder 211, the first valve 222 is opened, and the ambient pressure of the core 260 to be tested is controlled to a target pressure (monitored by the first pressure gauge) by the booster pump 223.
Then, the first valve 222 is closed, the exhaust valve 232 and the third valve 245 are opened, and the interior of the core 260 to be tested is evacuated for more than 10 hours by the vacuum pump 231, thereby exhausting the adsorbed gas and the free gas.
Next, the exhaust valve 232 and the third valve 245 are closed, the vacuum pump 231 is turned off, the second valve 242 is opened, test gas at a pressure (monitored by the second pressure gauge 243) is admitted into the reference cup 244 of known volume, and the second valve 242 is closed.
Then, the third valve 245 is opened to allow the test gas in the reference cup 244 to enter the pressure-loaded core 260 to be tested; the pressure decay of the system (data collected by the second pressure gauge 243) is recorded by the computer 250.
And finally, stopping data acquisition after the pressure is not attenuated any more, opening the exhaust valve 232 and taking out the core to be tested 260.
Through the implementation of the above process, the time-dependent pressure variation relationship can be obtained, and at this time, the permeability can be settled by combining the formula introduced in the foregoing embodiment.
The specific calculation formula is as follows:
where L represents the length of the core 260 to be tested, and the length of the core 260 to be tested can be obtained by measuring the length before testing, and the unit of measurement can be m, etc.
Phi is the porosity of the core 260 to be tested and may be measured on the core 260 to be tested prior to testing or known for the core 260 to be tested.
KaThe partial derivative of the density of the adsorption phase with respect to the density of the test gas, the density of the test gas being a known parameter of the test gas, and the density of the adsorption phase being a known parameter of the core 260 to be tested.
μ is the kinetic viscosity of the test gas, and for known parameters of the test gas, the units of measure can be: Pa.S-1。
cgFor measuring the compression factor of the density of the gas, for a known parameter of the gas, a measurement unitThe bits may be: pa is-1。
α1Is the transcendental equation tan alpha is 3 alpha/(3 + K)cα2) The first solution of (1), wherein KcThe ratio of the volume of gas expected to be introduced into the core 260 to be tested to the volume of gas absorbable by the core 260 to be tested can be calculated as:
wherein, VsIs the volume of the reference cup 244, a known parameter; vbIs the volume of the core 260 to be tested, is a known parameter.
Further, the ratio of the mass of test gas eventually absorbed in reference cup 244 to the mass of test gas that core 260 under test has absorbed is assumed to be F:
Finally, according to the formula: lnF ═ f0-s1t, the fitting slope s of the straight line can be determined1Represents a linear relationship between lnF and t, where f0Is the intercept of the corresponding straight line, does not influence s1And (4) calculating.
In this document, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
The above description is only an example of the present application and is not intended to limit the scope of the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A method for testing permeability of a core overburden matrix, comprising:
controlling the pressure around the core to be tested to a target pressure; the target pressure represents a simulated formation pressure;
pumping out gas in the rock core to be tested;
introducing test gas with preset pressure into the rock core to be tested, and acquiring pressure change information of the rock core to be tested in the process of introducing the test gas;
and determining the matrix permeability of the rock core to be tested under the simulated formation pressure condition according to the pressure change information.
2. The testing method of claim 1, wherein said determining a matrix permeability of the core under test under the simulated formation pressure conditions from the pressure variation information comprises:
by the formula:
calculating the matrix permeability of the core to be tested under the simulated formation pressure condition;
wherein L is the predetermined length of the core to be tested; phi is the predetermined porosity of the core to be tested; kaIs a predetermined adsorption phase density phaseA partial derivative for the test gas density; μ is a preset kinetic viscosity of the test gas; c. CgIs a preset density compressibility of the test gas; s1Fitting a slope to a line determined from the pressure change information; alpha is alpha1For a predetermined transcendental equation tan α of 3 α/(3+ K)cα2) The first solution of (a); wherein, KcIs the ratio of the volume of gas expected to be passed into the core to be tested to the volume of gas absorbable by the core to be tested.
3. A test device for permeability of a core overburden matrix, the test device being configured to perform the test method of any one of claims 1-2, the test device comprising:
the core fixing device is used for fixing a core to be tested;
the pressurization device is used for controlling the pressure around the core to be tested to a target pressure; the target pressure represents a simulated formation pressure;
the vacuum device is used for pumping out gas in the rock core to be tested;
the ventilation device is used for introducing test gas with preset pressure into the core to be tested; collecting pressure change information of the rock core to be tested in the process of introducing the test gas;
and the computer is connected with the ventilation device and used for determining the matrix permeability of the core to be tested under the condition of the simulated formation pressure according to the pressure change information.
4. The test device of claim 3, wherein the pressurization device comprises:
a booster pump for increasing the pressure around the core to be tested;
and the first pressure gauge is used for being connected with the core to be tested and acquiring the pressure around the core to be tested.
5. The testing device of claim 4, wherein the booster pump is further provided with a first valve, the first valve being connected to the computer, the computer further being configured to control the opening or closing of the first valve.
6. The testing device of claim 4, wherein the booster pump and the first pressure gauge are placed in an incubator.
7. The testing device of claim 3, wherein the vent comprises:
the gas source, the reference cup and the second pressure gauge;
the gas source is used for introducing test gas into the reference cup; the test gas in the reference cup is used for being introduced into the core to be tested;
the second pressure gauge is connected with the computer, is arranged close to the reference cup, and is used for monitoring the pressure introduced into the reference cup to be the preset pressure, acquiring the pressure change information when the test gas is introduced into the core to be tested, and sending the pressure change information to the computer.
8. The testing device of claim 7, wherein a second valve is disposed between the gas source and the reference cup, the second valve being connected to the computer, the computer further being configured to control the opening or closing of the second valve.
9. The testing device of claim 8, wherein a third valve is disposed between the reference cup and the core to be tested, the third valve being connected to the computer, the computer further being configured to control the opening or closing of the third valve.
10. The testing device of claim 7, wherein the reference cup and the second pressure gauge are placed in an incubator.
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