CN210720086U - Rock porosity testing device - Google Patents
Rock porosity testing device Download PDFInfo
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- CN210720086U CN210720086U CN201921212020.XU CN201921212020U CN210720086U CN 210720086 U CN210720086 U CN 210720086U CN 201921212020 U CN201921212020 U CN 201921212020U CN 210720086 U CN210720086 U CN 210720086U
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Abstract
The utility model discloses a rock porosity testing arrangement relates to the experimental technical field of oil gas exploration and development. The method comprises the following steps: the rock porosity testing device comprises a gas source, a standard chamber, a sample chamber, a booster pump, a first pressure sensor, a first valve, a second valve and a vacuum pump, wherein the rock porosity testing device is used for providing extra pressure for gas in the rock porosity testing device on the basis of measuring the rock porosity by adopting a Boyle's law double-chamber method, so that the gas can enter dense pores such as mesopores and micropores in a rock sample, the situation that the measured rock porosity is smaller than an actual value is avoided, and the accuracy of rock porosity testing is improved.
Description
Technical Field
The utility model relates to an experimental technical field of oil gas exploration and development, in particular to rock porosity testing arrangement.
Background
Rock porosity refers to the ratio of the volume of space in the pores of the rock to the volume of the rock, generally expressed in percent. If the porosity is larger, it indicates that the more pore space in the rock, the more oil and gas resources may be stored. Meanwhile, the rock porosity has a great influence on the rock stability. Therefore, during the development of oil and gas fields, rock is sampled and analyzed to determine the rock porosity.
At present, testers generally adopt a double-chamber Boyle's law method to measure the porosity of the rock. The existing rock porosity testing device generally comprises a gas cylinder, a sample chamber and a standard chamber, wherein the sample chamber is communicated with the standard chamber, and the standard chamber is also communicated with the gas cylinder. During measurement, the porosity of the sample is judged by observing the injection amount of gas from the standard chamber to the sample chamber and after the balance is reached
When using boyle's law double-chamber method to survey the rock, because there is the hole that is close-grained in the rock, when using current porosity testing arrangement to test, gas is difficult to be full of these close-grained holes completely, and the rock porosity of surveing compares with actual value and is slightly littleer, influences the accuracy of rock porosity test.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a rock porosity testing arrangement can effectively improve the accuracy of rock porosity test, technical scheme is as follows:
an embodiment of the utility model provides a rock porosity testing arrangement, include: air supply, standard chamber, sample room, booster pump, first pressure sensor, first valve, second valve and vacuum pump, the standard chamber with the sample room has import and export respectively, the export of air supply with the import intercommunication of first valve, the export of first valve and the import intercommunication of standard chamber, the export of standard chamber with the import intercommunication of second valve, the export of second valve with the import intercommunication of sample room, the export of sample room with the access connection of third valve, the export of third valve with the import intercommunication of vacuum pump, the export of booster pump with the import intercommunication of first valve, first pressure sensor connects the import of standard chamber with between the export of first valve.
Optionally, the rock porosity testing device further comprises a pressure regulating valve, an inlet of the pressure regulating valve is communicated with an outlet of the booster pump, and an outlet of the pressure regulating valve is communicated with an inlet of the first valve.
Optionally, the rock porosity testing device further comprises a second pressure sensor connected between the outlet of the gas source and the inlet of the pressure regulating valve.
Optionally, the rock porosity testing device further comprises a fourth valve, an inlet of the fourth valve is communicated with an outlet of the booster pump, and an outlet of the fourth valve is communicated with an inlet of the pressure regulating valve.
Optionally, the rock porosity testing device further comprises a controller connected with the fourth valve and the pressure regulating valve, the controller being configured to control the fourth valve to conduct when the pressure on the inlet side of the pressure regulating valve is less than a first threshold; and when the pressure on the inlet side of the pressure regulating valve is not less than the first threshold value, controlling the fourth valve to be closed.
Optionally, the controller is further connected to the first valve and the second valve, and the controller is configured to control the first valve to close when a duration of the first valve being on reaches a second threshold, and to control the second valve to be on after the first valve is closed.
Optionally, the controller is further connected to the sample chamber and a third valve, the controller being configured to control the third valve to close when the pressure in the sample chamber reaches a third threshold.
Optionally, the rock porosity testing device further comprises a gas release valve, and the gas release valve is connected with the sample chamber.
Optionally, the vacuum pump has a vacuum gauge.
Optionally, the gas source is a helium source.
The embodiment of the utility model provides a beneficial effect that technical scheme brought is:
the embodiment of the utility model provides a rock porosity testing arrangement at first closes first valve and second valve, opens the third valve, will be equipped with the sample room of rock sample through the vacuum pump and take out to high vacuum state (pressure is 10)-1～10- 5Pa), the vacuum pressure of the sample chamber is recorded, and the third valve and the vacuum pump are closed. The rock porosity is measured by adopting a Boyle's law double-chamber method, gas of a gas source is pressurized by a booster pump, a first valve is opened, the gas is filled into a standard chamber with a known volume, after the pressure is balanced, the first valve is closed, and a first pressure sensor is used for recording the first pressure in the rock porosity measuring device at the moment. And then opening a second valve to enable the gas in the standard chamber to diffuse into the sample chamber, and recording a second pressure in the rock porosity testing device at the moment by using the first pressure sensor after the pressure is balanced. The particle volume of the rock sample can be calculated by using the numerical values of the vacuum pressure, the first pressure and the second pressure, and then the rock porosity is calculated. This rock porosity testing arrangement can provide extra pressure for the gas in the rock porosity testing arrangement through setting up the booster pump, makes the mesopore that gas can get into in the rock sampleAnd in compact pores such as micropores, the phenomenon that the measured rock porosity is smaller than an actual value is avoided, and the accuracy of rock porosity test is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a rock porosity testing device provided by an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a rock porosity testing device provided by an embodiment of the present invention. As shown in fig. 1, the rock porosity testing apparatus includes: the device comprises a gas source 1, a standard chamber 2, a sample chamber 3, a booster pump 4, a first pressure sensor 5, a first valve 6, a second valve 7, a third valve 8 and a vacuum pump 9.
The standard chamber 2 and the sample chamber 3 are respectively provided with an inlet and an outlet, the outlet of the gas source 1 is communicated with the inlet of the first valve 6, the outlet of the first valve 6 is communicated with the inlet of the standard chamber 2, the outlet of the standard chamber 2 is communicated with the inlet of the second valve 7, the outlet of the second valve 7 is communicated with the inlet of the sample chamber 3, the outlet of the sample chamber 3 is connected with the inlet of the third valve 8, the outlet of the third valve 8 is communicated with the inlet of the vacuum pump 9, the outlet of the booster pump 4 is communicated with the inlet of the first valve 6, and the first pressure sensor 5 is connected between the inlet of the standard chamber 2 and the outlet of the first valve 6.
The embodiment of the utility model provides a rock porosity testing arrangement at first closes first valve and second valve, opens the third valve, will be equipped with the sample room of rock sample through the vacuum pump and take out to high vacuum state(pressure of 10)-1～10- 5Pa), the vacuum pressure of the sample chamber is recorded, and the third valve and the vacuum pump are closed. The rock porosity is measured by adopting a Boyle's law double-chamber method, gas of a gas source is pressurized by a booster pump, a first valve is opened, the gas is filled into a standard chamber with a known volume, after the pressure is balanced, the first valve is closed, and a first pressure sensor is used for recording the first pressure in the rock porosity measuring device at the moment. And then opening a second valve to enable the gas in the standard chamber to diffuse into the sample chamber, and recording a second pressure in the rock porosity testing device at the moment by using the first pressure sensor after the pressure is balanced. The particle volume of the rock sample can be calculated by using the numerical values of the vacuum pressure, the first pressure and the second pressure, and then the rock porosity is calculated. This rock porosity testing arrangement can provide extra pressure for the gas in the rock porosity testing arrangement through setting up the booster pump, makes during compact pores such as the mesopore in the gas can get into the rock sample, micropore, avoids surveing the rock porosity that determines to compare with the actual value slightly littlely, has improved the accuracy of rock porosity test.
Illustratively, in using the rock porosity testing device, the first valve 6 and the second valve 7 are closed, the third valve 8 is opened, and the sample chamber 3 containing the rock sample a is pumped to a high vacuum state (pressure 10) by the vacuum pump 9-1～10- 5Pa), observing the pressure in the sample chamber 3 by arranging a vacuum gauge on a pipeline between the vacuum pump 9 and the sample chamber 3, and recording the reading P of the vacuum gauge at the moment when the reading of the vacuum gauge is stablevAnd the third valve 8 and the vacuum pump 9 are closed; then opening a first valve 6, inflating the standard chamber 2 through the air source 1, reading the pressure in the standard chamber 2 through a first pressure sensor 5, closing the first valve 6 when the change of the pressure along with the time is less than 0.01psi/min or the inflation time is not less than a second threshold value, and recording the reading P of the first pressure sensor 5 at the moment1(ii) a Then the second valve 7 is opened to diffuse the gas in the standard chamber 2 into the sample chamber 3, the pressure in the standard chamber 2 and the sample chamber 3 is read by the first pressure sensor 5, when the change of the pressure with time is less than 0.01After psi/min or the time of gas diffusion is greater than or equal to the second threshold, the reading P of the first pressure sensor 5 at that time is recorded2(ii) a The volume of the standard chamber 2 is known as VsThe volume of the sample chamber 3 is VyThe particle volume V of the rock sample measured according to Boyle's Makint's lawgAnd vacuum pressure PvThe standard chamber 2 has a volume VsThe volume of the sample chamber 3 is VyAnd reading P of the first pressure sensor 51、P2Has the following relationship:
P1Vs+PV(Vy-Vg)＝P2(Vs+Vy-Vg)，
finishing to obtain:
from the calculation formula, the particle volume V of the rock sample a can be calculatedg(ii) a Knowing the Total volume V of rock sample abAccording to a calculation formula of rock porosity:
the rock porosity of the pattern sample a can be calculated.
Optionally, the rock porosity testing device comprises a pressure regulating valve 10, an inlet of the pressure regulating valve 10 being in communication with an outlet of the booster pump 4, an outlet of the pressure regulating valve 10 being in communication with an inlet of the first valve 6. When carrying out rock porosity test, when the gas pressure through booster pump 4 pressure boost exceeded the required reference pressure of test, can be through adjusting air-vent valve 10, with gas pressure regulation for the required reference pressure of test, further improved rock porosity test's accuracy.
Optionally, the rock porosity testing device further comprises a second pressure sensor 11, the second pressure sensor 11 being connected between the outlet of the gas source 1 and the inlet of the pressure regulating valve 10. The second pressure sensor 11 can detect the pressure of gas in a pipeline between the gas source 1 and the pressure regulating valve 10 in the rock porosity testing device, and a tester can conveniently control the rock porosity testing device according to the pressure of the gas.
Optionally, the rock porosity testing device further comprises a fourth valve 12, an inlet of the fourth valve 12 is communicated with an outlet of the booster pump 4, and an outlet of the fourth valve 12 is communicated with an inlet of the pressure regulating valve 10. When the booster pump 4 is not used, the fourth valve 12 is closed, so that the branch length between the pipelines of the rock porosity testing device can be reduced, and the gas pressure between the gas source 1 and the pressure regulating valve 10 is prevented from being reduced due to the fact that the branch length of the pipelines is too long.
Optionally, the rock porosity testing device further comprises a controller (not shown in the figure), the controller is connected with the fourth valve 12 and the pressure regulating valve 10, and the controller is configured to control the fourth valve 12 to conduct when the pressure on the inlet side of the pressure regulating valve 10 is less than a first threshold value; when the pressure on the inlet side of the pressure regulating valve 10 is not less than the first threshold value, the fourth valve 12 is controlled to be closed. For example, the first threshold is 300psi, when the pressure at the inlet side of the pressure regulating valve 10 is less than 300psi, the controller controls the fourth valve 12 to be opened, and the tester opens the booster pump to boost the gas between the gas source 1 and the pressure regulating valve 10; when the pressure on the inlet side of the pressure regulating valve 10 is not less than 300psi, the controller controls the fourth valve 12 to close, and the tester regulates the pressure regulating valve 10 to regulate the output gas pressure to 300 psi.
It should be noted that the above specific value of the first threshold is merely an example, and the first threshold may be set to other values, for example, the first threshold may also be 250psi, 350psi, and the like. For rock samples a with different rock porosities, different first thresholds may be set to correspond to the test.
Optionally, the controller is further connected to the first valve 6 and the second valve 7, and the controller is configured to control the first valve 6 to close when the time period during which the first valve 6 is on reaches a second threshold value, and to control the second valve 7 to be on after the first valve 6 is closed. For example, the second threshold is 20 minutes, and when the second valve 10 is turned on for not less than 20 minutes, the controller controls the first valve 6 to close, so that the volume and pressure of the gas entering the standard chamber 2 are kept stable. The controller controls the second valve 7 to open so that the gas in the standard chamber 2 can enter the sample chamber 3.
The above specific value of the second threshold is merely an example, and the second threshold may be set to other values, for example, the second threshold may be 15 minutes, 25 minutes, or the like. For rock samples a with different volumes, the volume of the standard chamber 2 will also change, the time required for the gas to reach pressure equilibrium in the standard chambers 2 with different volumes will also be different, and different second thresholds can be set for the corresponding tests.
Optionally, the controller is further connected to the sample chamber 3 and to a third valve 8, the controller being configured to control said third valve 8 to close when the pressure in the sample chamber 3 reaches a third threshold value. For example, in the embodiment of the present invention, the third threshold is 10- 1Pa. When the pressure in the sample chamber 3 reaches 10-5After Pa, the sample chamber 3 is in a high vacuum state. At the moment, the controller controls the third valve 8 to be closed, so that the sample chamber 3 is isolated from the vacuum pump 9, and the situation that impurities such as air and lubricating oil are pumped back from the vacuum pump 9 by the sample chamber 3 in a high vacuum state after the vacuum pump 9 is closed, so that the sample chamber 3 is polluted is avoided.
It should be noted that the above specific value of the third threshold is merely an example, and the third threshold may be set to other values, for example, the third threshold may also be 10-3、10-5PaAnd the like. As long as can guarantee that sample room 3 is in under the high vacuum state, the embodiment of the utility model does not limit this.
Optionally, the rock porosity testing device further comprises a gas release valve 13, the gas release valve 13 being connected to the sample chamber 3. When using rock porosity testing arrangement to test when accomplishing, can be through opening bleed valve 13, the gas in the porosity testing arrangement is emptied, guarantees that rock porosity testing arrangement is inside to be in the ordinary pressure state when not using, extension rock porosity testing arrangement's life.
Optionally, the vacuum pump 9 has a vacuum gauge 91. Through selecting for use the vacuum pump that has the vacuum gauge 91, when using vacuum pump 9 to carry out the evacuation to sample room 3, the vacuum gauge 91 on the direct observation vacuum pump 9 can obtain the pressure data in the sample room 3, has avoided external vacuum gauge to observe on the pipeline between vacuum pump 9 and sample room 3, makes things convenient for the test.
Optionally, gas source 1 is a helium gas source. Helium has small molecular weight, strong diffusivity and high permeability, can enter compact pores in the rock more easily than other gases, and can improve the accuracy of the rock porosity test by using the helium as the test gas.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (10)
1. A rock porosity testing device, comprising: air supply (1), standard chamber (2), sample chamber (3), booster pump (4), first pressure sensor (5), first valve (6), second valve (7), third valve (8) and vacuum pump (9), standard chamber (2) with sample chamber (3) have import and export respectively, the export of air supply (1) with the import intercommunication of first valve (6), the export of first valve (6) with the import intercommunication of standard chamber (2), the export of standard chamber (2) with the import intercommunication of second valve (7), the export of second valve (7) with the import intercommunication of sample chamber (3), the export of sample chamber (3) with the import of third valve (8) is connected, the export of third valve (8) with the import intercommunication of vacuum pump (9), the outlet of the booster pump (4) is communicated with the inlet of the first valve (6), and the first pressure sensor (5) is connected between the inlet of the standard chamber (2) and the outlet of the first valve (6).
2. The rock porosity testing device according to claim 1, further comprising a pressure regulating valve (10), an inlet of the pressure regulating valve (10) being in communication with an outlet of the booster pump (4), an outlet of the pressure regulating valve (10) being in communication with an inlet of the first valve (6).
3. The rock porosity testing device according to claim 2, further comprising a second pressure sensor (11), the second pressure sensor (11) being connected between the outlet of the gas source (1) and the inlet of the pressure regulating valve (10).
4. A rock porosity testing device according to claim 3, further comprising a fourth valve (12), an inlet of the fourth valve (12) being in communication with an outlet of the booster pump (4), an outlet of the fourth valve (12) being in communication with an inlet of the pressure regulating valve (10).
5. The rock porosity testing device according to claim 4, further comprising a controller connected to the fourth valve (12) and the pressure regulating valve (10), the controller being configured to control the fourth valve (12) to conduct when the pressure at the inlet side of the pressure regulating valve (10) is less than a first threshold value, and to control the fourth valve (12) to close when the pressure at the inlet side of the pressure regulating valve (10) is not less than the first threshold value.
6. The rock porosity testing device according to claim 5, wherein the controller is further connected to the first valve (6) and the second valve (7), the controller being configured to control the first valve (6) to close when a duration of the first valve (6) to conduct reaches a second threshold value, and to control the second valve (7) to conduct after the first valve (6) is closed.
7. The rock porosity testing device according to claim 6, wherein the controller is further connected with the sample chamber (3) and a third valve (8), the controller being configured to control the third valve (8) to close when the pressure in the sample chamber (3) reaches a third threshold value.
8. A rock porosity testing device according to any one of claims 1 to 7, further comprising a gas release valve (13), the gas release valve (13) being connected to the sample chamber (3).
9. A rock porosity testing device according to any one of claims 1 to 7, wherein the vacuum pump (9) has a vacuum gauge (91).
10. A rock porosity testing device according to any one of claims 1 to 7, wherein the gas source (1) is a helium source.
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| CN201921212020.XU CN210720086U (en) | 2019-07-29 | 2019-07-29 | Rock porosity testing device |
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| CN201921212020.XU CN210720086U (en) | 2019-07-29 | 2019-07-29 | Rock porosity testing device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114577694A (en) * | 2020-12-02 | 2022-06-03 | 中国石油化工股份有限公司 | Rock quantitative saturation device and experimental method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114577694A (en) * | 2020-12-02 | 2022-06-03 | 中国石油化工股份有限公司 | Rock quantitative saturation device and experimental method |
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