CN112394017A - Gas-measuring porosity instrument suitable for high organic matter minerals and use method - Google Patents
Gas-measuring porosity instrument suitable for high organic matter minerals and use method Download PDFInfo
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Abstract
The invention provides a gas-measuring porosity meter suitable for high organic mineral and a using method thereof. The operation method comprises the steps of firstly putting a sample into a sample chamber, closing an emptying valve and an air supply valve through driving software, opening a vacuum pump to vacuumize a system main body, and automatically closing a valve of the vacuum pump to start a sample porosity testing process when the vacuum degree reaches-1 psi. Experimental results prove that for organic mineral-rich substances such as shale, coal beds and the like, the device can successfully test the porosity of the obtained sample, and the device can improve the testing accuracy to a certain extent considering that a certain amount of organic matters exist in the natural mineral rock sample.
Description
Technical Field
The invention belongs to the field of coal chemical industry measurement, and particularly relates to a gas measurement porosity meter for measuring organic matters.
Background
The traditional gas measurement porosity instrument expands gas with a known volume to an unknown volume under determined pressure based on a gas expansion principle, measures final equilibrium pressure after expansion, and calculates the skeleton volume of a sample according to the Boyle's law, so that the porosity of the sample is further calculated by combining the appearance volume. When the traditional gas porosity measuring device is used for testing, when organic minerals are rich in a sample, the equilibrium pressure cannot be measured, and the existing data show that the reason is not found temporarily.
The conventional gas-measuring porosity instrument is suitable for measuring conventional oil and gas reservoir rock cores and is characterized by low organic matter content such as clastic rock, carbonate rock, limestone and the like, and the acquisition of the balance pressure of the gas-measuring porosity instrument is not influenced due to the low organic matter content and low adsorption in the measuring process. With the progress of exploration and development, the exploration field is gradually expanded to reservoirs with high organic matter content such as shale and coal rock, and unconventional core pore measurement (such as hydrocarbon source rock and a field newly taken core containing crude oil), the organic matter content is high, the adsorbed gas quantity is large, so that the problem that the balance pressure cannot be obtained or the obtained balance pressure is problematic is caused, the measurement result is inaccurate, and the existing data cannot find the reason.
Disclosure of Invention
For high organic matter minerals, due to the characteristic that the adsorption degree of organic matters to gas changes along with temperature and pressure, in an experiment, the process of expansion of known volume gas to unknown volume is accompanied by a strong multi-gas competitive adsorption phenomenon, so that the volume of the gas is unstable, and the equilibrium pressure cannot be accurately measured. The invention aims to solve the defects in the prior art and provide a gas porosimeter device suitable for high organic minerals.
The invention adopts the following technical scheme:
a gas porosity measuring instrument suitable for high organic minerals comprises an inert gas high-pressure gas cylinder, a standard chamber, a sample chamber, a pressure sensor, a vacuum pump and a computer.
One end of the sample chamber is connected with the vacuum pump, the other end of the sample chamber is connected with one end of the standard chamber, the other end of the standard chamber is connected with the inert gas high-pressure gas cylinder, and a pressure sensor and a vacuum sensor are installed on a pipeline connecting the standard chamber and the sample chamber.
An air release valve is arranged on a pipeline connecting the sample chamber with the atmosphere, a vacuum pump is arranged on a pipeline connecting the sample chamber with the standard, a measuring valve is arranged on a pipeline connecting the sample chamber with the standard chamber, an air supply valve is arranged on a pipeline connecting the standard chamber with the air source, and an air source valve is also arranged at the outlet of the inert gas high-pressure cylinder.
Pneumatic valves such as a pressure sensor, a vacuum sensor, an air supply valve, a measuring valve, an emptying valve and an air source valve are all connected to a computer, and test system software is arranged in the computer and used for receiving pressure values detected by the sensors and controlling the opening and closing of the valves.
Further, the source gas is primarily helium or nitrogen, with helium being preferred.
Furthermore, a pressure regulating valve is also arranged on a pipeline connecting the air supply valve and the air source valve.
The preferable technical scheme is that an inert gas source in the inert gas high-pressure gas cylinder is nitrogen or helium and other small-molecule inert gases, and helium is the best, and the main reason is that 1) helium has small molecules (the molecular radius is 0.9A) and can enter a capillary of a sample as a medium; 2) helium has a low molecular weight (M ═ 4.003), and has better permeability for the sample; 3) the helium adsorption of inert gas and natural mineral substances is poor.
Preferably, the standard chamber is a 304 stainless steel cylindrical container with a pressure resistance of 10MPa for enclosing a certain amount of gas therein.
Preferably, the pressure sensor is used to sense the raw standard chamber gas and the pressure of the system after expansion, with a sensor accuracy of 0.01 psi.
Preferably, the vacuum pressure sensor is used for detecting the vacuum degree of the test body system, and the accuracy of the sensor requires-1 psi.
The further technical scheme is that the sample chamber is a cylindrical stainless steel container, the material is 304 stainless steel, the container internal diameter is 30mm, highly is 70mm for place the sample in the experiment, has the stainless steel post of being equipped with not co-altitude simultaneously in it, when rock core length is less than 70mm, can adopt these stainless steel posts to fill up the sample chamber, improves the measuring accuracy.
A use method of a gas porosimeter suitable for high organic matter minerals comprises the following steps:
before testing, the vent valve, the measurement valve, the supply valve, and the supply valve should be closed first.
The testing process begins, samples with different known volumes are taken and placed in the sample chamber, the sample chamber is sealed, the computer software drives the air supply valve and the air release valve to be closed (whether the samples are closed or not is confirmed again), the vacuum pump is started, and after the standard chamber and the sample chamber are vacuumized to 0.1psi, the vacuum valve is closed.
The vacuum degree in the sample chamber is detected by a vacuum sensor which is used for detecting the vacuum degree in the system, and the air in the system can be pumped out to avoid competitive adsorption of strong adsorption gas and helium.
The vacuum sensor can detect the tightness of the system, and the vacuum pump can evacuate air in the standard chamber and the sample chamber to avoid competitive adsorption of strong adsorption gas and helium gas in the standard chamber and the sample chamber.
Then, the computer software drives the measuring valve to close, opens the gas source valve and the gas supply valve, so that gas of the gas source enters the standard chamber, and closes the gas source valve and the gas supply valve after the pressure reaches 1 MPa.
Then, the computer software drives the measuring valve to open, the gas in the standard chamber enters the sample chamber to fill the sample chamber and the pore space of the sample therein, when the pressure fluctuates to plus or minus 0.1psi, the pressure is considered to be stable, and after the pressure is stable, the computer software is utilized to read the pressure data on the pressure sensor;
and finally, repeatedly testing 4-5 mineral samples, drawing the volume of the mineral sample and corresponding equilibrium pressure data points on a coordinate axis, fitting a straight line, and considering that the test basis is established when the fitting degree of the straight line reaches more than 99.99%.
And further, placing the test sample into a sample chamber, repeating the measurement steps to obtain the balance pressure of the test sample, substituting the balance pressure into a fitting linear formula to obtain the skeleton volume of the test sample, and calculating the porosity of the test sample by combining the appearance volume of the sample.
The gas porosity measuring instrument provided by the invention aims at the problem that equilibrium pressure cannot be tested due to the competitive adsorption phenomenon of multi-element gas on the surface of the mineral rich in organic matters, a system vacuumizing step is added in the experimental process, the competitive adsorption phenomenon of the multi-element gas is avoided, the equilibrium pressure can be tested and obtained for the mineral sample rich in organic matters, and the equilibrium pressure can be more accurate for common minerals, so that the experimental precision and the experimental efficiency are improved.
The invention has the beneficial effects that:
the invention provides a gas porosity measuring instrument device suitable for high organic minerals, which is based on Boyle's law and aims at solving the problem that equilibrium pressure cannot be measured due to competitive adsorption of test gas and strong adsorption gas (such as CO2 and the like) in the air in the test process of a sample rich in organic minerals. This device can testingly obtain balanced pressure to the mineral sample that is rich in organic matter, and to ordinary mineral, also can make balanced pressure more accurate to experimental precision and experimental efficiency have been improved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
in the figure, 1 is an inert gas high-pressure gas cylinder, 2 is a gas supply valve, 3 is a standard chamber, 4 is a pressure sensor, 5 is a vacuum sensor, 6 is a measuring valve, 7 is a sample chamber, 8 is an emptying valve and 9 is a computer.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention are described below clearly and completely, and it is obvious that the described embodiments are some, not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a porosity meter suitable for high organic mineral without a pressure regulating valve
As shown in figure 1, the gas porosity measuring instrument suitable for high organic matter minerals comprises a gas source, a standard chamber 3, a sample chamber 7, a vacuum pump, a valve and a computer 9.
The gas source is contained in an inert gas high-pressure gas cylinder 1, the outlet of the inert gas high-pressure gas cylinder 1 is connected with the inlet end of a standard chamber 3 through a connecting pipe, and the outlet end of the standard chamber 3 is connected with one end of a sample through a connecting pipe.
A pipeline connecting the sample chamber 7 and the standard chamber 3 is provided with a vacuum sensor 5 for detecting the internal vacuum degree and a pressure sensor 4 for detecting the internal pressure, and the vacuum sensor 5 and the pressure sensor 4 are arranged on the pipeline to facilitate the installation, the disassembly and the maintenance of the sensors.
Or a vacuum sensor 5 and a pressure sensor 4 for detecting the vacuum degree and the pressure in the sample chamber 7 and the standard chamber 3 are arranged in the standard chamber 3. The vacuum sensor 5 and the pressure sensor 4 are installed in the standard chamber 3 mainly because the sample chamber 7 vacuumized in the step 2 is connected with the standard chamber 3 in series, the vacuum sensor 5 measures the vacuum value of the sample chamber 7 and the standard chamber 3, and the output pressure in the standard chamber 3 needs to be adjusted to 0.8MPa in the step 3. It is therefore possible to mount both the vacuum sensor 5 and the pressure sensor 4 on the standard chamber 3.
The outlet of the inert gas high-pressure gas cylinder 1 is provided with a gas source valve for preventing gas leakage, a gas supply valve 2 is arranged on a pipeline for connecting the inert gas high-pressure gas cylinder 1 and the standard chamber 3, certainly, the gas source can be provided by using other standard equipment, so that a pressure regulating valve is not needed to be adopted, a measuring valve 6 is arranged on a pipeline for connecting the standard chamber 3 and the sample chamber 7, an emptying valve 8 is arranged on a pipeline for connecting the sample chamber 7 and the external atmosphere, the emptying valve 8 needs to be opened after the measurement is finished, and the vacuum pump is arranged on a pipeline for measuring the standard chamber 3 and the sample chamber 7 under the normal atmospheric pressure condition in the sample chamber 7.
The air source valve, the air supply valve 2, the measuring valve 6 and the emptying valve 8 are in signal connection with a computer 9, the computer 9 controls the valves at all positions to be opened and closed, and the computer 9 can also control the vacuum pump to be opened and closed; the vacuum sensor 5 and the pressure sensor 4 are in signal connection with the computer 9 and are used for uploading measured vacuum degree and pressure value data to the computer 9.
The preferable technical scheme is that an inert gas source in the inert gas high-pressure gas cylinder 1 is nitrogen or helium and other small-molecule inert gases, and helium is the best, and the main reason is that 1) helium molecules are small (the molecular radius is 0.9A) and can enter a capillary of a sample as a medium; 2) helium has a low molecular weight (M ═ 4.003), and has better permeability for the sample; 3) the helium adsorption of inert gas and natural mineral substances is poor.
Preferably, the standard chamber 3 is a 304 stainless steel cylindrical container having a pressure resistance of 10MPa for enclosing a certain amount of gas therein.
Preferably, the pressure sensor 4 is used to detect the pressure of the original reference cell 3 gas and the system after expansion, with a sensor accuracy of 0.01 psi.
Preferably, the vacuum pressure sensor 4 is used for detecting the vacuum degree of the test body system, and the accuracy of the sensor requires-1 psi.
The further technical scheme is that the sample chamber 7 is a cylindrical stainless steel container made of 304 stainless steel, the inner diameter of the container is 30mm, the height of the container is 70mm, the sample is placed in an experiment, stainless steel columns with different heights are arranged in the container, and when the core length is less than 70mm, the sample chamber 7 can be filled with the stainless steel columns, so that the test precision is improved.
Meanwhile, the invention provides the gas-measuring porosity instrument with the pressure regulating valve, which is suitable for the high organic matter mineral
A gas porosity measuring instrument suitable for high organic minerals comprises a gas source, a standard chamber 3, a sample chamber 7, a vacuum pump, a valve and a computer 9.
The gas source is contained in an inert gas high-pressure gas cylinder 1, the outlet of the inert gas high-pressure gas cylinder 1 is connected with the inlet end of a standard chamber 3 through a connecting pipe, and the outlet end of the standard chamber 3 is connected with one end of a sample through a connecting pipe.
A pipeline connecting the sample chamber 7 and the standard chamber 3 is provided with a vacuum sensor 5 for detecting the internal vacuum degree and a pressure sensor 4 for detecting the internal pressure, and the vacuum sensor 5 and the pressure sensor 4 are arranged on the pipeline to facilitate the installation, the disassembly and the maintenance of the sensors.
Or a vacuum sensor 5 and a pressure sensor 4 for detecting the vacuum degree and the pressure in the sample chamber 7 and the standard chamber 3 are arranged in the standard chamber 3. The vacuum sensor 5 and the pressure sensor 4 are installed in the standard chamber 3 mainly because the sample chamber 7 vacuumized in the step 2 is connected with the standard chamber 3 in series, the vacuum sensor 5 measures the vacuum value of the sample chamber 7 and the standard chamber 3, and the output pressure in the standard chamber 3 needs to be adjusted to 0.8MPa in the step 3. It is therefore possible to mount both the vacuum sensor 5 and the pressure sensor 4 on the standard chamber 3.
The gas source valve for preventing gas leakage is installed at the outlet of the inert gas high-pressure gas cylinder 1, the gas supply valve 2 is installed on a pipeline connecting the inert gas high-pressure gas cylinder 1 and the standard chamber 3, a gas source is provided by adopting a high-pressure steel cylinder, the gas source pressure provided in the high-pressure steel cylinder is inevitably higher than the inert gas pressure required to be provided in the standard chamber 3, therefore, the pressure relief processing needs to be carried out on the inert gas pressure, a pressure regulating valve is installed on the pipeline connecting the gas source valve and the gas supply valve 2, the measuring valve 6 is installed on the pipeline connecting the standard chamber 3 and the sample chamber 7, the vent valve 8 is installed on the pipeline connecting the sample chamber 7 and the external atmosphere, the vent valve 8 needs to be opened after the measurement is finished, and the vacuum pump is installed on the pipeline connecting the standard chamber 3 and the sample chamber 7.
The air source valve, the air supply valve 2, the measuring valve 6 and the emptying valve 8 are in signal connection with a computer 9, the computer 9 controls the valves at all positions to be opened and closed, and the computer 9 can also control the vacuum pump to be opened and closed; the vacuum sensor 5 and the pressure sensor 4 are in signal connection with the computer 9 and are used for uploading measured vacuum degree and pressure value data to the computer 9.
The preferable technical scheme is that an inert gas source in the inert gas high-pressure gas cylinder 1 is nitrogen or helium and other small-molecule inert gases, and helium is the best, and the main reason is that 1) helium molecules are small (the molecular radius is 0.9A) and can enter a capillary of a sample as a medium; 2) helium has a low molecular weight (M ═ 4.003), and has better permeability for the sample; 3) the helium adsorption of inert gas and natural mineral substances is poor.
Preferably, the standard chamber 3 is a 304 stainless steel cylindrical container having a pressure resistance of 10MPa for enclosing a certain amount of gas therein.
Preferably, the pressure sensor 4 is used to detect the pressure of the original reference cell 3 gas and the system after expansion, with a sensor accuracy of 0.01 psi.
Preferably, the vacuum pressure sensor 4 is used for detecting the vacuum degree of the test body system, and the accuracy of the sensor requires-1 psi.
The further technical scheme is that the sample chamber 7 is a cylindrical stainless steel container made of 304 stainless steel, the inner diameter of the container is 30mm, the height of the container is 70mm, the sample is placed in an experiment, stainless steel columns with different heights are arranged in the container, and when the core length is less than 70mm, the sample chamber 7 can be filled with the stainless steel columns, so that the test precision is improved.
A use method of a gas porosimeter suitable for high organic matter minerals comprises the following steps:
step 1, before the experimental test, closing the air source valve, the air supply valve 2, the measuring valve 6, the emptying valve 8 and the pressure regulating valve.
Step 2, preparing experimental tests, namely placing a sample in a sample chamber 7, sealing the sample chamber 7, opening a measuring valve 6, starting a vacuum pump to carry out vacuumizing operation on the standard chamber 3, the sample chamber 7 and the sample pore space, closing the vacuum pump after the vacuum degree reaches-1 psi, and closing the measuring valve 6.
And 2, testing in an experiment, namely opening an air source valve, opening a pressure regulating valve, regulating the pressure to about 0.8MPa, opening an air supply valve 2, recording the pressure after the pressure sensor 4 displays stable pressure value, opening a sample measuring valve 6, communicating a standard chamber 3 and a sample chamber 7, recording the balance pressure after the pressure of the pressure sensor 4 is stable, opening an emptying valve 8, and finishing the experiment.
The gas measurement porosimeter provided by the invention is characterized in that a system vacuum pump is additionally arranged on the basis of a conventional gas measurement porosimeter aiming at the problem that the equilibrium pressure cannot be tested due to the competitive adsorption phenomenon of multi-component gas on the surface of an organic matter-rich mineral, a sample is placed in a sample chamber 7 in the experimental process, the sample chamber 7 is sealed, an air source valve, an air supply valve 2 and an air release valve 8 are closed, a measurement valve 6 is opened, the vacuum pump is started to carry out vacuum pumping operation on a standard chamber 3, the sample chamber 7 and a sample pore space, the vacuum pump is closed after the vacuum degree reaches-1 psi, and the measurement valve 6 is closed. And opening an air source valve, adjusting the pressure regulating valve to about 0.8MPa, opening the air supply valve 2, recording the pressure after the pressure value displayed by the pressure sensor 4 is stable, opening the measuring valve 6, communicating the standard chamber 3 with the sample chamber 7, recording the balance pressure after the pressure of the pressure sensor 4 is stable, opening the vent valve 8, and ending the experiment. The device is additionally provided with the vacuumizing operation, so that gas supplied by a gas source is removed from the system, and no other gas is contained, thereby avoiding competitive adsorption of multi-component mixed gas, ensuring that the balance pressure is more accurate, and improving the experiment precision and the experiment efficiency.
Example 1 testing of organic-rich mineral samples
The inner Mongolia Heilall basin coal bed gas reservoir has the maturity of 0.2-0.8%, belongs to low-order coal rock, has the organic matter content (TOC) test result of 8-12%, is rich in organic matter low-order coal rock, adopts a full-automatic helium porosity instrument (ultra-300) of American rock core company in the conventional gas method porosity test process, adopts a standard sample calibration instrument to carry out porosity measurement, and causes that the balance pressure cannot be obtained and the measurement fails due to the absorption phenomenon of multiple gases of helium, nitrogen, carbon dioxide and the like in the air in the measurement process. By adopting the method based on the invention, the system sample chamber 7 and the rock core are pumped out before measurement, the balance pressure can be smoothly measured, and the porosity can be calculated.
Example 2 testing of ordinary minerals
Aiming at a shale reservoir core from a Living Longmaxi group in Sichuan, the TOC content is 8-10%, the organic matter content is higher, the test result is 1.56% and the data repeatability is poor by adopting a conventional method of a full-automatic helium porosimeter (Ultrapore-300) of American core company to measure; the measurement after evacuation based on the method of the invention is adopted, the test result is 2.13%, and the data repeatability is good; the contrast test adopts a method of evacuating and pressurizing saturated absolute ethyl alcohol to measure the porosity of the core, the test result is 2.08%, and the measurement error of the method is that the saturation degree is low, so that the porosity is low. In contrast, the measurement results based on the method of the present invention are more consistent with the actual porosity of the shale.
EXAMPLE 3 unconventional porosity test experiment
The field coring sample of a certain oil field originally contains formation water and crude oil, the original porosity measurement is carried out due to project requirements, the measurement is carried out by adopting a conventional method of a full-automatic helium porosity instrument (Ultrapore-300) of American rock core company, the pressure precision is 1Psi, and the measurement fails because the balance pressure is unstable in the measurement process.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. A gas-measuring porosity instrument suitable for high organic mineral is characterized in that the gas-measuring porosity device comprises an inert gas high-pressure gas cylinder, a standard chamber, a sample chamber, a pressure sensor, a vacuum pump and a pneumatic valve, and comprises a computer for data acquisition and valve switch driving;
the inert gas high-pressure gas cylinder is connected with the inlet end of the standard chamber through a pipeline, and the outlet of the standard chamber is connected with the sample chamber through a connecting pipe;
an air source valve is installed at the outlet of the inert gas high-pressure cylinder, an air supply valve is installed on a pipeline connecting the inert gas high-pressure cylinder and the standard chamber, a pressure regulating valve for regulating air pressure is also installed on a pipeline between the air source valve and the air supply valve, a measuring valve is installed on a pipeline connecting the standard chamber and the sample chamber, an emptying valve is installed on a pipeline connecting the sample chamber and the atmosphere, and a vacuum pump is installed on a pipeline connecting the standard chamber and the sample chamber;
the air source valve, the air supply valve, the measuring valve, the emptying valve and the pressure regulating valve are all connected with a computer;
the pressure sensor and the vacuum sensor are arranged on a pipeline for connecting the standard chamber and the sample chamber and are connected with a computer.
2. The gas porosimeter for high organic matter mineral of claim 1, wherein the inert gas in the inert gas high pressure cylinder is any one of nitrogen or helium.
3. The gas porosimeter for high organic matter mineral of claim 1, wherein said reference chamber is a 304 stainless steel cylindrical container having a pressure resistance of 10MPa for enclosing a certain amount of gas therein.
4. The gas porosimeter for high organic matter mineral of claim 1, wherein said pressure sensor is used to detect the pressure of the original standard chamber gas and the system after expansion, the accuracy of the sensor requires 0.01 psi.
5. The gas porosimeter for high organic matter mineral of claim 1, wherein said vacuum sensor is used for detecting the vacuum degree of the test body system, and the accuracy of the sensor is required to be-1 psi.
6. The gas measurement porosimeter suitable for high organic matter mineral of claim 1, wherein the sample chamber is a cylindrical stainless steel container made of 304 stainless steel, the inner diameter of the container is 30mm, the height is 70mm, and the container is used for placing samples in experiments, and meanwhile, stainless steel columns with different heights are arranged in the container, and when the core length is less than 70mm, the sample chamber can be filled with the stainless steel columns, so that the test precision is improved.
7. A method suitable for a gas porosimeter for high organic matter minerals is characterized by comprising the following steps:
step 1, before testing, firstly closing an emptying valve, a measuring valve, an air supply valve and an air source valve;
step 2, starting a testing process, placing different samples with known volumes into a sample chamber, sealing the sample chamber, driving an air supply valve and an air release valve to be closed by computer software, starting a vacuum pump, and closing the vacuum pump after the standard chamber and the sample chamber are vacuumized to 0.1 psi;
step 3, the computer software drives the measuring valve to close, opens the gas source valve, the gas supply valve and the pressure regulating valve, enables gas of the gas source to enter the standard chamber, and closes the gas source valve, the gas supply valve and the pressure regulating valve after the pressure of the gas source reaches 1 MPa;
step 4, the computer software drives the measuring valve to open, the standard indoor gas enters the sample chamber to fill the sample chamber and the pore space of the sample therein, the pressure is considered to be stable when the pressure fluctuates to plus or minus 0.1psi, and after the pressure is stable, the computer software is utilized to read pressure data on the pressure sensor;
and 5, repeatedly testing 4-5 mineral samples, drawing the volume of the mineral sample and corresponding equilibrium pressure data points on the coordinate axis, fitting a straight line, and determining that the test basis is established when the fitting degree of the straight line reaches more than 99.99%.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050034507A1 (en) * | 2003-07-07 | 2005-02-17 | Porotech Ltd. | Porosimetric device |
| CN201730615U (en) * | 2010-06-26 | 2011-02-02 | 大庆油田有限责任公司 | Evacuating saturation device for testing rock porosity |
| CN204903351U (en) * | 2015-09-06 | 2015-12-23 | 西南石油大学 | Three -dimensional rock specimen hole measuring device of jumbo size |
| CN105910971A (en) * | 2016-04-14 | 2016-08-31 | 西南石油大学 | Combined measurement method for organic matter-rich compact rock core gas permeability and diffusion coefficient |
| CN106970000A (en) * | 2017-04-21 | 2017-07-21 | 西南石油大学 | Coal/shale extra-high absorption and Seepage Experiment evaluate shale gas adsorption method |
| CN107167407A (en) * | 2016-03-07 | 2017-09-15 | 中国石油化工股份有限公司 | A kind of rock porosity determines device |
-
2020
- 2020-05-21 CN CN202010436964.6A patent/CN112394017A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050034507A1 (en) * | 2003-07-07 | 2005-02-17 | Porotech Ltd. | Porosimetric device |
| CN201730615U (en) * | 2010-06-26 | 2011-02-02 | 大庆油田有限责任公司 | Evacuating saturation device for testing rock porosity |
| CN204903351U (en) * | 2015-09-06 | 2015-12-23 | 西南石油大学 | Three -dimensional rock specimen hole measuring device of jumbo size |
| CN107167407A (en) * | 2016-03-07 | 2017-09-15 | 中国石油化工股份有限公司 | A kind of rock porosity determines device |
| CN105910971A (en) * | 2016-04-14 | 2016-08-31 | 西南石油大学 | Combined measurement method for organic matter-rich compact rock core gas permeability and diffusion coefficient |
| CN106970000A (en) * | 2017-04-21 | 2017-07-21 | 西南石油大学 | Coal/shale extra-high absorption and Seepage Experiment evaluate shale gas adsorption method |
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Application publication date: 20210223 |