CN112881230A - Shale gas vibration desorption test evaluation device and method - Google Patents
Shale gas vibration desorption test evaluation device and method Download PDFInfo
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- 238000003795 desorption Methods 0.000 title claims abstract description 157
- 238000011156 evaluation Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000012360 testing method Methods 0.000 title claims abstract description 30
- 239000007789 gas Substances 0.000 claims abstract description 187
- 238000002474 experimental method Methods 0.000 claims abstract description 59
- 238000001179 sorption measurement Methods 0.000 claims abstract description 56
- 230000008569 process Effects 0.000 claims abstract description 16
- 238000002347 injection Methods 0.000 claims abstract description 7
- 239000007924 injection Substances 0.000 claims abstract description 7
- 238000013480 data collection Methods 0.000 claims abstract description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 34
- 239000001307 helium Substances 0.000 claims description 17
- 229910052734 helium Inorganic materials 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 16
- 230000008859 change Effects 0.000 claims description 5
- 238000005086 pumping Methods 0.000 claims description 5
- 230000003139 buffering effect Effects 0.000 claims description 3
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- 238000005411 Van der Waals force Methods 0.000 description 1
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- 239000003345 natural gas Substances 0.000 description 1
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Abstract
The invention provides a shale gas vibration desorption test evaluation device and method, belongs to the technical field of shale gas exploration, development and test and yield increase treatment, and promotes the desorption of shale gas by applying the method through vibration treatment on a near well and a reservoir zone to form a method for improving the shale gas recovery ratio through desorption. The device comprises a gas injection system for providing gas to be tested, a pressurization system, an adsorption and desorption system, a vibration system, a constant temperature system and a data collection system. The invention realizes the research of the shale desorption process under the same frequency and different amplitudes or the same amplitude and different frequencies, and meets the use requirements; continuous desorption experiments under different pressure points are realized, and meanwhile, the desorption gas collecting device is directly connected with the sample chamber, so that the accuracy of measurement of desorption gas under different desorption pressures is ensured; the conventional shale adsorption and desorption experiments at different temperatures and different pressures are realized, and the adsorption and desorption performance evaluation experiment of various gases on shale can be carried out by replacing the high-pressure gas cylinder.
Description
Technical Field
The invention relates to the technical field of shale gas exploration, development and test and yield increase treatment, in particular to a shale gas vibration desorption test evaluation device and method capable of quickly and accurately measuring the desorption conditions of shale under different vibration conditions.
Background
Shale gas is unconventional natural gas, is rich in shale gas resources in China, and is the third country in the world for realizing economic development of shale gas. Generally, shale gas reservoirs have the characteristics of low porosity and low permeability, and are difficult to develop. Shale gas has three occurrence modes in shale: free gas present in the larger pores and cracks, adsorbed gas present in an adsorbed state on the surface of the small pores, and dissolved gas dissolved in the organic matter. Wherein, the proportion of the adsorbed gas is the largest, and is generally 20 to 80 percent of the total gas content.
The shale gas adsorption and desorption performance evaluation is a basic parameter in shale gas exploration and development, and has important influence on shale reservoir reserve evaluation, development scheme design and the like. During shale gas production, free gas is usually produced first, but the free gas in a shale reservoir is low in general, so that the initial yield is reduced quickly. The gas adsorbed on the surface of the pore is gradually desorbed along with the reduction of the pressure of the shale gas reservoir, and the shale gas is mainly desorbed and diffused from an adsorption state to a free state in the process of exploiting the shale gas because the ratio of the adsorbed gas is higher, so that the yield of the shale gas is directly influenced by the desorption of the gas; and the natural desorption speed of the shale gas is slow, the time consumption is long, and if the natural desorption is adopted to exploit the shale gas in the exploitation of the shale gas, the exploitation efficiency is inevitably limited by the desorption speed of the shale gas. Therefore, how to promote desorption of the adsorbed gas in exploitation of the shale gas has an important influence on yield increase and stable production of the shale gas.
The mechanical vibration is just one way to promote shale gas desorption and improve shale gas recovery ratio. The mechanical vibration can generate a heat effect to promote desorption through temperature rise, and can also enable gas molecules to obtain more kinetic energy to promote desorption of gas and accelerate desorption speed. As an effective mode in the aspect of improving the recovery ratio of the coal bed gas, the mechanical vibration has wide application range in the aspects of improving the shale gas desorption speed, promoting shale desorption, improving experiment precision and improving the recovery ratio. However, the related researches are few at present, and the existing few devices for researching mechanical vibration desorption have some defects and need to be further improved.
The existing device for researching mechanical vibration desorption mostly adopts a method of one-time desorption under normal pressure when a desorption experiment is carried out, namely, after the adsorption experiment is finished, all free gas is directly exhausted, only one-time desorption is carried out, and the change of accumulated desorption gas along with time is measured. In the above experimental mode, when comparing results, in order to ensure the accuracy of comparison, it is necessary to require that the initial shale gas contents of each desorption experiment are equal, which is difficult to control, so that the accuracy of comparison results is difficult to ensure; and a one-time desorption method is adopted, so that continuous desorption experiments under different pressure points cannot be realized, the experiment workload is large, and the efficiency is low.
Disclosure of Invention
The invention aims to provide a shale gas vibration desorption test evaluation device and method to solve at least one technical problem in the background technology. The shale vibration desorption evaluation device can be used for performing desorption test experiments on the shale under different amplitude and frequency conditions, measuring the shale gas desorption amount under different vibration conditions and evaluating the shale gas desorption amount; and conventional shale adsorption and desorption experiments can be carried out, and the adsorption and desorption performances of gases with different types of properties in shale pores can be researched by replacing the gas cylinders.
In order to achieve the purpose, the invention adopts the following technical scheme:
in one aspect, the invention provides a shale gas vibration desorption test evaluation device, which comprises:
the gas injection system is used for providing gas to be tested and comprises a plurality of gas storage cylinders, and the gas storage cylinders are connected with the gas inlet end of the standard chamber;
the pressurization system is used for pressurizing gas in the standard chamber and comprises a constant flow pump and an intermediate container, wherein the constant flow pump is communicated with the intermediate container, and the intermediate container is connected with the gas inlet end of the standard chamber;
the adsorption and desorption system comprises a standard chamber and a sample chamber for adsorption and desorption experiments, wherein the gas outlet end of the standard chamber is connected with the gas inlet end of the sample chamber, and the gas outlet end of the sample chamber is connected with a desorption gas collecting system;
the vibration system is used for providing mechanical vibration for the sample chamber and comprises a function/arbitrary wave generator, a power amplifier and a vibration exciter which are sequentially connected, and the output end of the vibration exciter is connected with the sample chamber;
the desorption gas collecting system is used for collecting and measuring desorption gas and comprises a back pressure valve, a hand pump connected with the back pressure valve and a water and gas collecting device;
the data collection system is used for automatically collecting experimental data in real time;
and the constant temperature system is used for heating the standard chamber and the sample chamber and providing the temperature required by the experiment.
Preferably, the method further comprises the following steps: and the vacuumizing system is used for vacuumizing the adsorption and desorption system and comprises a vacuum pump, and the vacuum pump is connected with the standard chamber.
Preferably, the gas bomb, the vacuum pump and the intermediate container are all connected with the standard chamber through a first six-way valve, and the standard chamber is connected with a first pressure sensor through the first six-way valve.
Preferably, the gas storage cylinder comprises a methane high-pressure gas cylinder and a helium high-pressure gas cylinder, the methane stored in the methane high-pressure gas cylinder is used for adsorption and desorption experiments, the helium stored in the helium high-pressure gas cylinder is used for measuring the volume of a gap in the sample chamber, and the gas storage cylinder is connected with different ports of the first six-way valve through a pressure reducing valve.
Preferably, a buffer spring is connected to the sample chamber for buffering mechanical vibration.
Preferably, the standard chamber is connected with the sample chamber through a first gate valve, the air outlet end of the sample chamber is connected with a back pressure valve through a second six-way valve, and the sample chamber is connected with a second pressure sensor through the second six-way valve.
Preferably, the hand pump is communicated with the back pressure valve through a pipeline, a second gate valve is arranged on the pipeline, and a third pressure sensor is arranged between the second gate valve and the hand pump.
Preferably, a third gate valve is connected between the constant flow pump and the intermediate container.
In a second aspect, the present invention provides a method for performing shale gas vibration desorption test evaluation by using the shale gas vibration desorption test evaluation apparatus, including:
isothermal adsorption experimental process of shale:
filling a shale powder sample into the sample chamber, detecting the air tightness of the device, vacuumizing, measuring the void volume of the sample chamber by using helium gas, and vacuumizing again;
adjusting the temperature of the standard chamber and the temperature of the sample chamber to the temperature required by the experiment through a constant temperature system, filling gas into the standard chamber until the pressure of the standard chamber reaches a set value, and opening a first gate valve between the standard chamber and the sample chamber to perform an isothermal adsorption experiment;
after the pressure is balanced, closing the first gate valve between the standard chamber and the sample chamber, inflating the standard chamber again, and repeating the steps until the adsorption capacity tends to be stable;
the adsorption capacity is calculated by the pressure measured by the precision pressure sensor;
when the standard chamber is inflated, if the pressure of the standard chamber does not reach a set value, the pressurization system can be opened for pressurization;
isothermal desorption experimental procedure of shale:
after the isothermal adsorption experiment is finished, closing the first gate valve, opening the sample chamber for exhausting, closing the sample chamber after the pressure in the sample chamber is reduced to a specified value, and opening the first gate valve to start a desorption process;
the desorption process is to observe the pressure change in the sample chamber and the standard chamber, and after the pressure is balanced, the desorption is considered to be finished;
repeating the steps, and continuously reducing the pressure until the desorption experiment is completed;
the desorption amount is calculated from the pressure measured by the precision pressure sensor.
Preferably, the shale desorption experimental process under different vibration conditions comprises the following steps:
after the isothermal adsorption experiment of the shale is finished, closing the first gate valve, adjusting the hand pump to enable the pressure of the third pressure sensor to be lower than the adsorption balance pressure, opening a related valve of the second six-way valve, and discharging redundant gas of the sample chamber to enable the pressure of the first pressure sensor and the pressure of the third pressure sensor to be equal to the first pressure;
opening the function/arbitrary wave generator, the power amplifier and the vibration exciter, adjusting the function/arbitrary wave generator and the power amplifier to set the frequency and the amplitude of vibration, opening the first gate valve, and starting desorption;
the gas to be desorbed is not increased, and the discharged gas quantity is the desorbed gas quantity under the first pressure;
and repeating the steps, and continuously reducing the desorption pressure until the experiment is finished to obtain the accumulated gas desorption amount under each pressure point.
Keeping the vibration frequency unchanged, completing the desorption experiment under different vibration amplitudes, and evaluating the influence of the vibration amplitudes on desorption; and (3) keeping the vibration amplitude unchanged, completing the desorption experiment under different vibration frequencies, and evaluating the influence of the vibration frequency on desorption.
The invention has the following beneficial effects:
the influence of different vibration conditions on shale desorption can be researched, and the influence of a single variable on shale gas desorption can be researched by controlling the variable; the shale desorption process under the same frequency and different amplitudes or the same amplitude and different frequencies is researched, and the use requirements are met; continuous desorption experiments under different pressure points are realized, and meanwhile, the desorption gas collecting device is directly connected with the sample chamber, so that the accuracy of measurement of desorption gas under different desorption pressures is ensured; the conventional shale adsorption and desorption experiments under different temperatures and different pressures are realized, the adsorption and desorption performance evaluation experiments of various types of gases on the shale can be carried out by replacing different gas sources, and the shale adsorption and desorption performance evaluation experiment device has various functions and is simple and convenient to operate; through mechanical vibration, the desorption speed of the shale gas is improved, the desorption of the shale gas is accelerated, the experiment time is shortened, and the experiment precision is improved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced 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 based on these drawings without creative efforts.
Fig. 1 is a structural diagram of a shale gas vibration desorption test evaluation device according to an embodiment of the invention.
Wherein: 1-standard chamber; 2-advection pump; 3-an intermediate container; 4-a sample chamber; 5-function/arbitrary wave generator; 6-a power amplifier; 7-a vibration exciter; 8-a vacuum pump; 9-a first six-way valve; 10-a first pressure sensor; 11-a high-pressure methane cylinder; 12-helium high pressure gas cylinder; 13-a pressure relief valve; 14-a buffer spring; 15-a first gate valve; 16-a second six-way valve; 17-a back pressure valve; 18-a second pressure sensor; 19-a hand pump; 20-a drainage gas-collecting device; 21-a water storage tank; 22-measuring cylinder; 23-a second gate valve; 24-a third pressure sensor; 25-a third gate valve; 26-a constant temperature water bath tank; 27-a computer terminal; 28-water source.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below by way of the drawings are illustrative only and are not to be construed as limiting the invention.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
For the purpose of facilitating an understanding of the present invention, the present invention will be further explained by way of specific embodiments with reference to the accompanying drawings, which are not intended to limit the present invention.
It should be understood by those skilled in the art that the drawings are merely schematic representations of embodiments and that the elements shown in the drawings are not necessarily required to practice the invention.
Examples
As shown in fig. 1, the shale gas desorption test evaluation device provided by the embodiment of the present invention includes a gas injection system for providing gas required by an experiment, a pressurization system for pressurizing the gas, an adsorption and desorption system for performing adsorption and desorption of a shale sample, a vibration system for providing mechanical vibration, a desorbed gas collection system for collecting and measuring desorbed gas, a constant temperature system for providing temperature required by the experiment, a vacuum pumping system for pumping vacuum to the experiment system, and a data acquisition system for automatically acquiring data.
The gas injection system comprises a plurality of high-pressure gas cylinders connected in parallel, wherein the high-pressure gas cylinders comprise a methane high-pressure gas cylinder 11 and a helium high-pressure gas cylinder 12, and the methane high-pressure gas cylinder 11 and the helium high-pressure gas cylinder 12 are respectively connected to two interfaces of the first six-way valve 9 through pipelines.
The methane high-pressure gas cylinder 11 and the helium high-pressure gas cylinder 12 are both connected with a pressure reducing valve 13, the pressure reducing valve 13 is matched with the high-pressure gas cylinders, and when the gas cylinders and the pressure reducing valve 13 are opened, gas in the high-pressure gas cylinders flows out and enters a pipeline.
The pressurization system is connected to the first six-way valve 9 and comprises an intermediate container 3 and a parallel flow pump 2, the intermediate container 3 is a fully-sealed high-pressure-resistant stainless steel metal container, the upper and lower parts of the intermediate container are respectively provided with a connector which is respectively connected to the first six-way valve 9 and the third gate valve 25, and the pressure system is used for changing the volume occupied by gas by changing the amount of stored water in the intermediate container so as to adjust the pressure in the standard chamber 1.
One end of the intermediate container 3 is connected with the constant flow pump 2 through a third gate valve 25, the other end is connected with a first six-way valve 9, and the intermediate container can be connected with the standard chamber 1 through the first six-way valve 9.
The adsorption and desorption system comprises a standard chamber 1 and a sample chamber 4, the standard chamber 1 and the sample chamber 4 are connected through a first gate valve 15, the other end of the standard chamber 1 is connected with a gas injection system and a pressurization system through a first six-way valve 9, and the other end of the sample chamber 4 is connected with a desorption gas collection system through a second six-way valve 16.
The standard chamber 1 is connected with a first pressure sensor 10 through a first six-way valve 9, and the first pressure sensor 10 is a precise pressure sensor and can measure the pressure in the standard chamber 1. When the pressure does not reach the required value, the constant flow pump 2 is opened, the constant flow pump 2 is connected with a water source 28, a third gate valve 25 connected between the constant flow pump 2 and the intermediate container 3 is opened, and water is injected into the intermediate container 3 for pressurization until the required pressure is reached.
The sample chamber 4 is connected to a second pressure sensor 18 via a second six-way valve 16. The second pressure sensor 18 is a precision pressure sensor that measures the pressure in the sample chamber 4.
The vibration system comprises a function/arbitrary wave signal generator 5, a power amplifier 6 and an exciter 7. The function/arbitrary wave signal generator 5, the power amplifier 6 and the vibration exciter 7 are connected in sequence, and the output end of the vibration exciter 7 is connected with the sample chamber 4 to provide mechanical vibration to the sample chamber 4. The sample chamber 4 is connected with a high-strength buffer spring 14 for stabilizing and buffering.
The adsorption relationship is established by van der waals forces through the gas molecules and the adsorption media. The low-frequency pulse generated by the mechanical vibration has a thermal effect on one hand, promotes desorption by heating, and on the other hand can enable gas molecules to obtain more kinetic energy, so that the original adsorption balance can be changed, and the gas molecules are promoted to be stripped from the adsorption surface, thereby promoting the desorption of the gas; meanwhile, the internal structure of the shale can be changed to a certain extent by mechanical vibration, so that the pore structure is enlarged, the permeability is enhanced, and the desorption and diffusion of gas are facilitated. Therefore, the mechanical vibration is supplied to the sample chamber 4 by the vibration system, and the desorption of the gas in the sample chamber can be promoted, thereby increasing the desorption amount.
The desorption gas collecting system comprises a hand pump 19, a back pressure valve 17 and a water and gas discharging and collecting device 20. Hand pump 19 is connected with back pressure valve 17 through second gate valve 23 in order to provide the back pressure, and hand pump 19 is connected with third pressure sensor 24, and third pressure sensor 24 is accurate pressure sensor for survey the back pressure value that hand pump 19 provided. The water discharge and gas collection device 20 is connected with the back pressure valve 17 and is used for measuring the volume of the desorbed gas. The back pressure valve 17 is connected with the sample chamber 4 of the adsorption and desorption system through the second six-way valve 16.
The constant temperature system comprises a constant temperature water bath 26, and the adsorption and desorption system is arranged in the constant temperature water bath 26 and can be set at the experiment temperature of between room temperature and 100 ℃.
In practical application, the constant-temperature water bath in the constant-temperature system can also be a constant-temperature oil bath, the constant-temperature oil bath can realize high-temperature shale adsorption and desorption, the temperature range is wider, and the temperature is more stable.
The vacuum pumping system comprises a vacuum pump 6, and a vacuum pump 8 is connected with the adsorption and desorption system through a first six-way valve 9 and can be used for pumping vacuum to the system.
The pressure range of the vacuum pump 8 is-0.1-0 MPa.
The data acquisition system comprises a computer terminal 27 and various precise pressure sensors connected with the computer terminal 27, wherein the precise pressure sensors can measure pressure data in real time, send the pressure data to the computer terminal 27 and calculate the adsorption quantity.
The pressure testing range of the precision pressure sensor is 0-50 MPa.
In this embodiment 1, the test method for shale gas vibration desorption using the shale gas vibration desorption test evaluation apparatus includes:
isothermal adsorption experimental process of shale:
filling shale powder into the sample chamber 4, starting the vacuum pump 8 to vacuumize the adsorption and desorption system, then opening the helium high-pressure gas cylinder 12 and the pressure reducing valve 13 as well as the corresponding gate valve switch of the first six-way valve 9, filling a certain amount of helium into the standard chamber 1, closing the helium high-pressure gas cylinder 1 and the pressure reducing valve 13 as well as the corresponding gate valve switch of the first six-way valve 9, and opening the first gate valve 15 to enable the helium to enter the sample chamber 4. During this period, the change in the pressure values of the first pressure sensor 10 and the second pressure sensor 18 is continuously observed, and the void volume of the sample chamber 4 is calculated. The vacuum pump 8 is turned on again to evacuate.
And opening a methane high-pressure gas cylinder 11, a pressure reducing valve 13 and a corresponding gate valve switch of the first six-way valve 9, injecting methane into the standard chamber 1, and detecting the pressure through the first pressure sensor 10 until the pressure required by the experiment is reached. After the gas injection is finished, the methane high-pressure gas cylinder 11, the pressure reducing valve 13 and the corresponding gate valve switch of the first six-way valve 9 are closed, and the constant-temperature water bath tank 26 is opened to heat to the temperature required by the experiment. After the temperature of the constant temperature water tank is kept stable, the first gate valve 15 is opened, and methane enters the standard chamber 4 to start adsorption. During which the pressure values of the first pressure sensor 10 and the second pressure sensor 18 are continuously observed. After the pressure is balanced, the first gate valve 15 between the sample chamber 4 and the standard chamber 1 is closed, the standard chamber 1 is filled with methane again, and the steps are repeated until the adsorption amount tends to be stable, so that the adsorption experiment can be finished. The amount of adsorption is calculated from the pressure measured by the precision pressure sensor.
If the pressure value of the standard chamber 1 is lower than the pressure value required by the experiment when the gas is injected into the standard chamber 1, the constant-current pump 2 and the third gate valve 25 are opened, the standard chamber 1 and the intermediate container 3 are communicated, water is injected into the intermediate container 3 for pressurization, the pressure data transmitted by the first pressure sensor 10 is observed until the pressure value required by the experiment is reached, and the pressurization stage is finished.
Isothermal desorption experimental procedure of shale:
after the adsorption test is finished, the first gate valve 15 between the sample chamber 4 and the standard chamber 1 is closed, the relevant valve of the second six-way valve 16 is opened, a part of gas in the sample chamber 4 is discharged, the second pressure sensor 18 is observed, the relevant valve of the second six-way valve 16 is closed when the pressure is reduced to a specified value, the first gate valve 15 between the sample chamber 4 and the standard chamber 1 is opened, and the desorption test is started.
And continuously observing the pressure values of the first pressure sensor 10 and the second pressure sensor 18 in the desorption process, and after the pressure is stable, determining that the desorption process is finished. And repeating the steps, and continuously reducing the pressure until the desorption experiment is completed. The desorption amount can be calculated from the pressure measured by the precision pressure sensor.
Shale desorption experiment process under different vibration conditions:
after the adsorption test is finished, the first gate valve 15 between the sample chamber 4 and the standard chamber 1 is closed, the hand pump 19 is adjusted to make the pressure value of the third pressure sensor 24 lower than the adsorption equilibrium pressure value (i.e. the pressure value of the second pressure sensor 18 during adsorption equilibrium), the relevant valve of the second six-way valve 16 is opened, the redundant gas in the sample chamber 4 is slowly discharged, and the pressure in the sample chamber 4 (i.e. the pressure value of the second pressure sensor 18) is made to be consistent with the pressure value of the third pressure sensor 24.
The function/arbitrary wave signal generator 5, the power amplifier 6, and the vibration exciter 7 are opened, the function/arbitrary wave signal generator 5 is adjusted to set the frequency of vibration, the power amplifier 6 is adjusted to set the amplitude of vibration, the exhaust port of the back pressure valve 17 is inserted into the measuring cylinder 22 in the drainage gas collector 20, and desorption is started.
When the gas in the measuring cylinder 22 does not increase and the pressure value of the second pressure sensor 18 does not change, it is considered that the desorption at the pressure is finished, and the discharged gas amount is the desorption gas amount at the pressure. And repeating the steps, and continuously reducing the desorption pressure until the desorption experiment is finished to obtain the accumulated gas desorption amount under each pressure point.
The vibration frequency is kept unchanged, the desorption experiment is completed under different vibration amplitudes, and the influence of the vibration amplitudes on desorption can be evaluated; the desorption experiment is completed under different vibration frequencies while keeping the vibration amplitude unchanged, and the influence of the vibration frequency on desorption can be evaluated.
In summary, the shale gas vibration desorption test evaluation device provided by the embodiment of the invention provides vibration with different frequencies by using the signal generator, and the amplitude of the vibration can be changed by using the power amplifier, so that the influence of different vibration conditions on shale desorption is obtained; by controlling the variables, the desorption process of the shale under the same frequency and different amplitudes or the same amplitude and different frequencies is researched, the use requirement is met, and the method has great significance for researching the vibration desorption performance and evaluation of the shale.
The desorption pressure is accurately controlled through a back pressure valve and a hand pump, so that continuous desorption experiments under different pressure points can be realized; meanwhile, the desorption gas-collecting device is directly connected with the sample chamber, so that the measurement accuracy of the desorption gas under different desorption pressures is ensured.
The shale gas vibration desorption test evaluation device can realize conventional shale adsorption and desorption experiments at different temperatures and under different pressures, can perform adsorption and desorption performance evaluation experiments of various gases on shale by replacing the high-pressure gas cylinder, and has the advantages of various functions and simple and convenient operation.
The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Although the present disclosure has been described with reference to the specific embodiments shown in the drawings, it is not intended to limit the scope of the present disclosure, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive faculty based on the technical solutions disclosed in the present disclosure.
Claims (10)
1. The utility model provides a shale gas vibration desorption test evaluation device which characterized in that includes:
the gas injection system for providing the gas to be tested comprises a plurality of gas storage cylinders, wherein the gas storage cylinders are connected with the gas inlet end of the standard chamber (1);
the pressurization system for pressurizing gas in the standard chamber (1) comprises a constant-flow pump (2) and an intermediate container (3), wherein the constant-flow pump (2) is communicated with the intermediate container (3), and the intermediate container (3) is connected with the gas inlet end of the standard chamber (1);
the adsorption and desorption system comprises a standard chamber (1) and a sample chamber (4), wherein the gas outlet end of the standard chamber (1) is connected with the gas inlet end of the sample chamber (4), and the gas outlet end of the sample chamber (4) is connected with a desorption gas collecting system;
the vibration system is used for providing mechanical vibration for the sample chamber (4) and comprises a function/arbitrary wave generator (5), a power amplifier (6) and a vibration exciter (7) which are sequentially connected, wherein the output end of the vibration exciter (7) is connected with the sample chamber (4);
the desorption gas collecting system is used for collecting and measuring desorption gas and comprises a back pressure valve (17), a hand pump (19) connected with the back pressure valve and a water and gas collecting device (20);
the data collection system is used for automatically collecting experimental data in real time;
a constant temperature system for providing the standard chamber (1) and the sample chamber (4) with the temperature required by the experiment.
2. The shale gas vibration desorption test evaluation apparatus of claim 1, further comprising: the vacuum pumping system for vacuumizing the adsorption and desorption system comprises a vacuum pump (8), and the vacuum pump (8) is connected with the standard chamber (1).
3. The shale gas vibration desorption test evaluation device of claim 2, characterized in that:
the gas bomb, the vacuum pump (8) and the intermediate container (3) are all connected with the standard chamber (1) through a first six-way valve (9), and the standard chamber (1) is connected with a first pressure sensor (10) through the first six-way valve (9).
4. The shale gas vibration desorption test evaluation device of claim 3, characterized in that:
the gas storage cylinder comprises a methane high-pressure gas cylinder (11) and a helium high-pressure gas cylinder (12), methane stored in the methane high-pressure gas cylinder (11) is used for adsorption and desorption experiments, helium stored in the helium high-pressure gas cylinder (12) is used for measuring the volume of a gap in the sample chamber (4), and the methane high-pressure gas cylinder (11) and the helium high-pressure gas cylinder (12) are connected with different ports of the first six-way valve (9) through a pressure reducing valve (13).
5. The shale gas vibration desorption test evaluation device of claim 1, characterized in that:
the sample chamber (4) is connected with a buffer spring (14) for buffering mechanical vibration.
6. The shale gas vibration desorption test evaluation device of claim 1, characterized in that:
the standard chamber (1) is connected with the sample chamber (4) through a first gate valve (15), the air outlet end of the sample chamber (4) is connected with a back pressure valve (17) through a second six-way valve (16), and the sample chamber (4) is connected with a second pressure sensor (18) through the second six-way valve (16).
7. The shale gas vibration desorption test evaluation device of claim 1, characterized in that:
the drainage and gas collection device (20) comprises a water storage tank (21) and a measuring cylinder (22); through the pipeline intercommunication between hand pump (19) and backpressure valve (17), have second gate valve (23) on the pipeline, be equipped with third pressure sensor (24) between second gate valve (23) and hand pump (19).
8. The shale gas vibration desorption test evaluation device of claim 1, characterized in that:
and a third gate valve (25) is connected between the constant-current pump (2) and the intermediate container (3).
9. A method for performing shale gas vibration desorption test evaluation by using the shale gas vibration desorption test evaluation device of any one of claims 1-8, comprising:
isothermal adsorption experimental process of shale:
filling a shale powder sample into the sample chamber, vacuumizing, measuring the void volume of the sample chamber by using helium gas, and vacuumizing again;
adjusting the temperature of the standard chamber and the temperature of the sample chamber to the temperature required by the experiment, inflating the standard chamber until the pressure of the standard chamber reaches a set value, and opening a first gate valve between the standard chamber and the sample chamber to perform the isothermal adsorption experiment;
after the pressure is balanced, closing the first gate valve between the standard chamber and the sample chamber, inflating the standard chamber again, and repeating the steps until the adsorption capacity tends to be stable;
the adsorption capacity is calculated by the pressure measured by the precision pressure sensor;
when the standard chamber is inflated, if the pressure of the standard chamber does not reach a set value, the standard chamber can be pressurized through a pressurization system;
isothermal desorption experimental procedure of shale:
after the isothermal adsorption experiment is finished, closing the first gate valve, opening the sample chamber for exhausting, closing the sample chamber after the pressure in the sample chamber is reduced to a specified value, and opening the first gate valve to start a desorption process;
the desorption process is to observe the pressure change in the sample chamber and the standard chamber, and after the pressure is balanced, the desorption is considered to be finished;
repeating the steps, and continuously reducing the pressure until the desorption experiment is completed;
the desorption amount is calculated from the pressure measured by the precision pressure sensor.
10. The method of claim 9, further comprising:
shale desorption experiment process under different vibration conditions:
after the isothermal adsorption experiment of the shale is finished, closing the first gate valve, adjusting the hand pump to enable the pressure of the third pressure sensor to be lower than the adsorption balance pressure, opening a related valve of the second six-way valve, and discharging redundant gas of the sample chamber to enable the pressure of the first pressure sensor and the pressure of the third pressure sensor to be equal to the first pressure;
opening the function/arbitrary wave generator, the power amplifier and the vibration exciter, adjusting the function/arbitrary wave generator and the power amplifier to set the frequency and the amplitude of vibration, and starting desorption;
the gas to be desorbed is not increased, and the discharged gas quantity is the desorbed gas quantity under the first pressure;
repeating the steps, continuously reducing the desorption pressure until the experiment is finished, and obtaining the accumulated gas desorption amount under each pressure point;
keeping the vibration frequency unchanged, completing the desorption experiment under different vibration amplitudes, and evaluating the influence of the vibration amplitudes on desorption; and (3) keeping the vibration amplitude unchanged, completing the desorption experiment under different vibration frequencies, and evaluating the influence of the vibration frequency on desorption.
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