CN107387154B - Device for injecting surfactant - Google Patents
Device for injecting surfactant Download PDFInfo
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- CN107387154B CN107387154B CN201710671643.2A CN201710671643A CN107387154B CN 107387154 B CN107387154 B CN 107387154B CN 201710671643 A CN201710671643 A CN 201710671643A CN 107387154 B CN107387154 B CN 107387154B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
Abstract
The invention discloses a device for injecting a surfactant, which comprises: the device comprises a gas storage assembly, a liquid injection assembly, a first coal sample tank, a second coal sample tank, a fixed space assembly, a fourth pressure sensor and a degassing assembly. According to the method, the surfactant is injected into the first coal sample tank through the liquid injection assembly in a one-time quantitative and constant-pressure mode to obtain the pressure in the solid space assembly, and a first coal sample gas desorption curve is drawn according to the pressure change in the solid space assembly; and injecting a surfactant into the second coal sample tank by the liquid injection assembly in a staged quantitative and constant-pressure manner to obtain the pressure in the solid space assembly, drawing a second coal sample gas desorption curve according to the pressure change in the solid space assembly, and comparing the characteristics of the first coal sample gas desorption curve and the second coal sample gas desorption curve to obtain the optimal injection modes in different states, thereby providing convenience for selecting the mode of injecting the surfactant for subsequent engineering.
Description
Technical Field
The invention relates to the technical field of coal mines, in particular to a device for injecting a surfactant.
Background
Along with the continuous expansion of the mining depth and range of coal, the number of high-yield and high-efficiency mines is greatly increased, the intensity of comprehensive mechanical coal mining is higher, the production is concentrated, the propelling speed is higher, the gas on a coal face has the characteristics of high intensity, large quantity, extremely unbalanced and the like, meanwhile, the fully mechanized coal face has longer trend length, larger mining height and higher propelling speed, so that a goaf with a larger area is often formed, the fracture surface of the return air flow of the face is insufficient due to the influence of mining pressure, the ventilation resistance is high, the width of the air leakage zone of the mining is increased, a large amount of gas in the goaf enters the return air flow from the upper corner of the face, and the gas release rate before stoping is low, so that a large amount of gas in the goaf is gushed out, the gas concentration of the face of the mining area is over-limited, serious accident disaster can occur, and serious casualties and economic losses are caused.
In order to prevent the gas concentration from exceeding the limit, the coal body is wetted by injecting water into the medium, so that a certain effect is achieved on preventing the gas concentration value of the working face of the mining area from exceeding the limit, but the prevention effect is determined by the uniform wetting degree of the coal body, and the effect of preventing the gas concentration from exceeding the limit can be achieved only when the water content in the coal body reaches more than 4%. In practical application, due to the fact that the free energy of the surface of coal is low and the water permeability is poor, coal bodies are difficult to wet evenly, and expected effects are difficult to achieve. Therefore, some scholars reduce the gas emission intensity by adding a surfactant into water, on one hand, the surfactant can improve the wetting property of the water on coal, and the wetting effect is improved; on the other hand, the surfactant solution can absorb moisture in the air, a water-containing liquid film is formed on the surface of the coal body, so that the coal body is in a water-containing wet state for a long time, the heat absorption and temperature reduction effects are achieved, the gas desorption rate is effectively inhibited at low temperature and high humidity, and the remarkable effect of preventing the gas concentration from exceeding the limit is achieved.
At present, few researches are made on ways of injecting the surfactant in China, and how to effectively inject the surfactant becomes a technical problem which needs to be solved urgently by technical personnel in the field.
Disclosure of Invention
The invention aims to provide a device for injecting a surfactant, which is provided with a liquid injection assembly, a first coal sample tank and a second coal sample tank to obtain optimal injection modes in different states so as to select the mode for injecting the surfactant in the subsequent engineering.
To achieve the above object, the present invention provides an apparatus for injecting a surfactant, the apparatus comprising:
the gas storage component is used for adjusting the pressure of the high-pressure gas to obtain gas required by the experiment;
the liquid injection assembly is used for injecting the surfactant quantitatively and at constant pressure;
the first coal sample tank is used for storing a coal sample; the first input end of the first coal sample tank is connected with the gas storage assembly and used for receiving gas; the second input end of the first coal sample tank is connected with the liquid injection assembly and is used for receiving the surfactant injected at one time in a quantitative and constant pressure manner;
the second coal sample tank is used for storing the coal sample; the first input end of the second coal sample tank is connected with the gas storage component and used for receiving gas; a second input end of the second coal sample tank is connected with the liquid injection assembly and is used for receiving surfactant which is injected by stages in a quantitative and constant-pressure mode;
the fixed space assembly is respectively connected with the first output end of the first coal sample tank and the first output end of the second coal sample tank and is used for storing gas desorbed from the first coal sample tank or the second coal sample tank;
the fourth pressure sensor is arranged in the fixed space assembly and used for detecting the pressure of the gas desorbed from the coal sample in the fixed space assembly;
and the degassing assembly is connected with the fixed space assembly and is used for exhausting the gas in the fixed space assembly, the first coal sample tank, the second coal sample tank and the reference tank.
Optionally, the gas storage assembly includes:
the high-pressure steel cylinder is used for storing high-pressure gas, and the high-pressure gas is high-pressure nitrogen or high-pressure gas;
the pressure regulating valve is connected with the high-pressure steel cylinder and is used for regulating the pressure of high-pressure gas in the high-pressure steel cylinder to obtain gas required by an experiment, and the gas is nitrogen or gas;
the balance tank is connected with the pressure regulating valve and is used for receiving the gas generated by the pressure regulating valve;
the second stop valve is connected with the balance tank and used for controlling the gas circulation in the balance tank;
the fifth pressure sensor is arranged in the balance tank and used for detecting the pressure in the balance tank;
and the first stop valve is connected with the balance tank and is used for exhausting gas in the balance tank.
Optionally, the liquid injection assembly includes:
the liquid injection pump is used for injecting the surfactant at constant pressure;
the metering pump is connected with the liquid injection pump and is used for quantitatively injecting the surfactant;
the one-way valve is connected with the metering pump and used for controlling the directional injection of the surfactant;
the third stop valve is respectively connected with the one-way valve and the second input end of the first coal sample tank and is used for controlling the on-off of the surfactant injected into the first coal sample tank;
and the fourth stop valve is respectively connected with the one-way valve and the second input end of the second coal sample tank and is used for controlling the on-off of the surfactant injected into the second coal sample tank.
Optionally, the apparatus further comprises:
and the calibration component is respectively connected with the gas storage component, the first coal sample tank and the second coal sample tank and is used for respectively calibrating the volume of the first coal sample tank and the volume of the second coal sample tank.
Optionally, the calibration component includes:
the second electromagnetic valve is connected with the gas storage assembly and is used for adjusting the flow and the speed of nitrogen gas filling;
the reference tank is connected with the second electromagnetic valve and used for storing nitrogen;
a second pressure sensor disposed in the reference tank for detecting a pressure in the reference tank;
the fourth electromagnetic valve is respectively connected with the reference tank and the third input end of the second coal sample tank and is used for adjusting the flow and the speed of the nitrogen flowing out of the reference tank;
and the fifth electromagnetic valve is respectively connected with the reference tank and the third input end of the first coal sample tank and is used for adjusting the flow and the speed of the nitrogen flowing out of the reference tank.
Optionally, the apparatus further comprises:
and the constant temperature control assembly is used for enabling the first coal sample tank, the reference tank and the second coal sample tank to work at a first set temperature and enabling the fixed space assembly to work at a second set temperature.
Optionally, the thermostatic control device includes:
the first water tank is used for enabling the first coal sample tank, the reference tank and the second coal sample tank to work at a first set temperature;
the first temperature sensor is placed in the first water tank and used for detecting the temperature of water in the first water tank;
the first stirrer is placed in the first water tank and is used for stirring water in the first water tank to enable the water temperature to be uniform;
a first heater disposed in the first water tank for heating water in the first water tank;
a second water tank for operating the fixed space assembly at a second set temperature;
the second temperature sensor is placed in the second water tank and used for detecting the water temperature in the second water tank;
the second stirrer is placed in the second water tank and is used for stirring the water in the second water tank to ensure that the water temperature is uniform;
and the second heater is placed in the second water tank and used for heating the water in the second water tank.
Optionally, the degassing assembly comprises:
the eighth electromagnetic valve is connected with the fixed space assembly and used for adjusting the flow and the speed of the gas flowing out;
and the degassing pump is connected with the eighth electromagnetic valve and is used for exhausting gas in the fixed space assembly, the first coal sample tank, the second coal sample tank and the reference tank.
Optionally, the apparatus further comprises:
the first electromagnetic valve is connected with the second stop valve, and the third electromagnetic valve is connected with the second stop valve and used for adjusting the flow and the speed of gas filling;
the sixth electromagnetic valve is connected with the first output end of the first coal sample tank, and the seventh electromagnetic valve is connected with the first output end of the second coal sample tank and used for adjusting the flow and the speed of gas outflow;
the first pressure sensor is placed in the first coal sample tank and used for detecting the pressure in the first coal sample tank;
the third pressure sensor is placed in the second coal sample tank and used for detecting the pressure in the second coal sample tank;
the first ball valve is arranged at the second output end of the first coal sample tank and used for discharging the solution with the surfactant in the first coal sample tank;
and the second ball valve is arranged at the second output end of the second coal sample tank and is used for discharging the solution with the surfactant in the second coal sample tank.
Optionally, the apparatus further comprises: and the drawing component is connected with the fourth pressure sensor and used for drawing and displaying a gas desorption curve according to the pressure of the gas.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects: according to the method, the surfactant is injected into the first coal sample tank through the liquid injection assembly in a one-time quantitative and constant-pressure mode to obtain the pressure in the solid space assembly, and a first coal sample gas desorption curve is drawn according to the pressure change in the solid space assembly; and injecting a surfactant into the second coal sample tank by the liquid injection assembly in a staged quantitative and constant-pressure manner to obtain the pressure in the solid space assembly, drawing a second coal sample gas desorption curve according to the pressure change in the solid space assembly, and comparing the characteristics of the first coal sample gas desorption curve and the second coal sample gas desorption curve to obtain the optimal injection modes in different states, thereby providing convenience for selecting the mode of injecting the surfactant for subsequent engineering.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in 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 inventive exercise.
FIG. 1 is a schematic diagram of an apparatus for injecting a surfactant according to an embodiment of the present invention.
In the figure, 1, a high-pressure steel cylinder, 2, a pressure regulating valve, 3, a balance tank, 4, a first cut-off valve, 5, a fifth pressure sensor, 6, a second cut-off valve, 7, a first electromagnetic valve, 8, a second electromagnetic valve, 9, a third electromagnetic valve, 10, a first coal sample tank, 11, a reference tank, 12, a second coal sample tank, 13, a first pressure sensor, 14, a second pressure sensor, 15, a third pressure sensor, 16, a fourth electromagnetic valve, 17, a fifth electromagnetic valve, 18, a third cut-off valve, 19, a fourth cut-off valve, 20, a sixth electromagnetic valve, 21, a seventh electromagnetic valve, 22, a check valve, 23, a metering pump, 24, a liquid filling pump, 25, a fixed space component, 26, a fourth pressure sensor, 27, an eighth electromagnetic valve, 28, a degassing pump, 29, a first temperature sensor, 30, a first stirrer, 31, a first heater, 32, a second temperature sensor, 33, a second stirrer, 34, a second heater, 35, a first ball valve, a second water tank, 36, a second ball valve, 38, a second water tank, 38, and a third water tank.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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 aims to provide a device for injecting a surfactant, which is provided with a liquid injection assembly, a first coal sample tank 10 and a second coal sample tank 12 to obtain optimal injection modes in different states so as to facilitate the selection of the mode for injecting the surfactant in the subsequent engineering.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Fig. 1 is a structural view of an apparatus for injecting a surfactant according to an embodiment of the present invention, and as shown in fig. 1, the present invention provides an apparatus for injecting a surfactant, the apparatus including: the device comprises a gas storage component, a liquid injection component, a first coal sample tank 10, a second coal sample tank 12, a fixed space component 25, a degassing component, a fourth pressure sensor 26, a calibration component, a constant temperature control component, a first electromagnetic valve 7, a third electromagnetic valve 9, a sixth electromagnetic valve 20, a seventh electromagnetic valve 21, a first pressure sensor 13, a third pressure sensor 15, a first ball valve 35 and a second ball valve 36.
The liquid injection assembly is used for injecting the surfactant quantitatively and at constant pressure; annotate the liquid subassembly and include: the liquid injection pump 24, the metering pump 23, the one-way valve 22, the third stop valve 18 and the fourth stop valve 19.
An infusion pump 24 for injecting a surfactant at a constant pressure; a metering pump 23 connected with the liquid injection pump 24 and used for quantitatively injecting the surfactant; a check valve 22 connected with the metering pump 23 for controlling the directional injection of the surfactant; a third stop valve 18, connected to the check valve 22 and the second input end of the first coal sample tank 10, respectively, for controlling on/off of the surfactant injected into the first coal sample tank 10; and the fourth stop valve 19 is respectively connected with the one-way valve 22 and the second input end of the second coal sample tank 12, and is used for controlling the on-off of the surfactant injected into the second coal sample tank 12.
The gas storage component is used for adjusting the pressure of the high-pressure gas to obtain gas required by the experiment; the gas storage assembly specifically comprises: the high-pressure steel cylinder comprises a high-pressure steel cylinder 1, a pressure regulating valve 2, a balance tank 3, a second stop valve 6, a fifth pressure sensor 5 and a first stop valve 4.
The high-pressure steel cylinder 1 is used for storing high-pressure gas, and the high-pressure gas is high-pressure nitrogen or high-pressure gas; the pressure regulating valve 2 is connected with the high-pressure steel cylinder 1 and is used for reducing the pressure of the high-pressure gas in the high-pressure steel cylinder 1 to obtain gas required by an experiment, and the gas is nitrogen or gas; the balance tank 3 is connected with the pressure regulating valve 2 and is used for receiving the gas generated by the pressure regulating valve 2; the second stop valve 6 is connected with the balance tank 3 and used for controlling the gas circulation in the balance tank 3; a fifth pressure sensor 5 provided in the surge tank 3 for detecting a pressure in the surge tank 3; and a first stop valve 4 connected with the balance tank 3 and used for removing gas in the balance tank 3.
And the first electromagnetic valve 7 is connected with the second stop valve 6 in the gas storage assembly and is used for adjusting the flow and the speed of gas filling.
A first coal sample tank 10 for storing a coal sample; a first input end of the first coal sample tank 10 is connected with the first electromagnetic valve 7 and used for receiving gas; the second input end of the first coal sample tank 10 is connected with the third stop valve 18 of the liquid injection assembly, and is used for receiving the surfactant which is injected at a fixed quantity and a fixed pressure at one time.
And the first ball valve 35 is arranged at the second output end of the first coal sample tank 10 and is used for discharging the solution with the surfactant in the first coal sample tank 10.
And a first pressure sensor 13, disposed in the first coal sample tank 10, for detecting a pressure in the first coal sample tank 10.
And the third electromagnetic valve 9 is connected with the second stop valve 6 in the gas storage assembly and is used for adjusting the flow and the speed of gas filling.
A second coal sample tank 12 for storing a coal sample; a first input end of the second coal sample tank 12 is connected with the third electromagnetic valve 9 and is used for receiving gas; and a second input end of the second coal sample tank 12 is connected with the fourth stop valve 19 of the liquid injection assembly and is used for receiving surfactant which is injected by stages, quantitatively and at constant pressure.
And the second ball valve 36 is arranged at the second output end of the second coal sample tank 12 and is used for discharging the solution with the surfactant in the second coal sample tank 12.
And a third pressure sensor 15, disposed in the second coal sample tank 12, for detecting a pressure in the second coal sample tank 12.
And a sixth electromagnetic valve 20 connected to the first output end of the first coal sample tank 10 and used for adjusting the flow rate and speed of the gas flowing out.
And the seventh electromagnetic valve 21 is connected with the first output end of the second coal sample tank 12 and is used for adjusting the flow and the speed of the gas outflow.
A fixed space assembly 25, connected to the sixth electromagnetic valve 20 and the seventh electromagnetic valve 21, respectively, for storing the gas desorbed from the first coal sample tank 10 or the second coal sample tank 12;
and a fourth pressure sensor 26, disposed in the fixed space assembly 25, for detecting the pressure of the desorbed gas of the coal sample in the fixed space assembly 25.
And the degassing component is connected with the fixed space component 25 and is used for removing gas in the fixed space component 25, the first coal sample tank 10, the second coal sample tank 12 and the reference tank 11. The degas assembly comprises: an eighth solenoid valve 27, and a degassing pump 28.
An eighth solenoid valve 27 connected to the fixed space assembly 25 for adjusting the flow rate and speed of the gas flowing out; and the degassing pump 28 is connected with the eighth electromagnetic valve 27 and is used for exhausting gas in the fixed space component 25, the first coal sample tank 10, the second coal sample tank 12 and the reference tank 11.
The calibration component is connected with the second stop valve 6 of the gas storage component, the third input end of the first coal sample tank 10 and the third input end of the second coal sample tank 12 respectively, and is used for calibrating the volume of the first coal sample tank 10 and the volume of the second coal sample tank 12 respectively; the calibration component comprises: a second solenoid valve 8, a reference tank 11, a second pressure sensor 14, a fourth solenoid valve 16, a fifth solenoid valve 17.
The second electromagnetic valve 8 is connected with the second stop valve 6 of the gas storage assembly and is used for adjusting the flow and the speed of nitrogen filling; a reference tank 11 connected to the second solenoid valve 8 for storing nitrogen gas; a second pressure sensor 14 provided in the reference tank 11 for detecting a pressure in the reference tank 11; the fourth electromagnetic valve 16 is respectively connected with the reference tank 11 and the third input end of the second coal sample tank 12, and is used for adjusting the flow and the speed of the nitrogen flowing out from the reference tank 11; and the fifth electromagnetic valve 17 is respectively connected with the reference tank 11 and the third input end of the first coal sample tank 10, and is used for adjusting the outflow flow and speed of the nitrogen in the reference tank 11.
The constant temperature control assembly is used for enabling the first coal sample tank 10, the reference tank 11 and the second coal sample tank 12 to work at a first set temperature; operating the fixed space assembly 25 at a second set temperature; the thermostatic control device includes: a first water tank 37, a first temperature sensor 29, a first stirrer 30, a first heater 31, a second water tank 38, a second temperature sensor 32, a second stirrer 33, and a second heater 34.
A first water tank 37 for operating the first coal sample tank 10, the reference tank 11 and the second coal sample tank 12 at a first set temperature; a first temperature sensor 29 disposed in the first water tank 37 for detecting a temperature of water in the first water tank 37; a first stirrer 30 placed in the first water tank 37 for stirring water in the first water tank 37 to make the temperature of the water uniform; and a first heater 31 disposed in the first water tank 37 for heating the water in the first water tank 37.
A second water tank 38 for operating the fixed space assembly 25 at a second set temperature; a second temperature sensor 32 disposed in the second water tank 38 for detecting a temperature of water in the second water tank 38; a second agitator 33 disposed in the second water tank 38 for agitating the water in the second water tank 38 to make the temperature of the water uniform; and a second heater 34 disposed in the second water tank 38 for heating the water in the second water tank 38.
The first coal sample tank 10 and the second coal sample tank 12 are provided with a stirrer for stirring the aqueous solution containing the surfactant.
The optimum choice for the present invention is that the first set temperature in the first water tank 37 is equal to the second set temperature in the second water tank 38.
The high-pressure steel cylinder 1 of the invention can be arranged into one or two, and no matter one high-pressure steel cylinder 1 or two high-pressure steel cylinders 1 are arranged, high-pressure nitrogen and high-pressure gas are inevitably placed respectively.
The method comprises the following steps of drawing a gas desorption curve according to the pressure of the gas in the fixed space component 25, wherein the gas desorption curve is drawn manually according to the pressure of the gas in the fixed space component 25; the other is that a drawing component is arranged, and a gas desorption curve is drawn and displayed through the drawing component according to the pressure of the gas in the fixed space component 25.
The specific using method of the device for injecting the surfactant comprises the following steps:
(1) And (4) pretreating the coal sample.
Collecting and preparing a coal sample according to the coal sample preparation method (GB 474-2008), putting the prepared coal sample into a vacuum drying oven, and carrying out vacuum drying for 12 hours at the temperature of 80 ℃ to remove moisture and partial impurities in the coal sample.
(2) And setting experimental parameters.
The experimental parameters included: degassing temperature, adsorption temperature, fixed space temperature, degassing time and other parameters.
(3) And (5) loading a coal sample and checking the air tightness.
The pretreated coal sample is uniformly divided into two parts, and the two parts are respectively placed in a first coal sample tank 10 and a second coal sample tank 12.
The pressure regulating valve 2, the second stop valve 6, the first electromagnetic valve 7, the second electromagnetic valve 8, the third electromagnetic valve 9, the fourth electromagnetic valve 16, the fifth electromagnetic valve 17, the sixth electromagnetic valve 20 and the seventh electromagnetic valve 21 are connected, nitrogen is injected into the reference tank 11, the first coal sample tank 10, the second coal sample tank 12 and the fixed space assembly 25 through the high-pressure steel cylinder 1, after a certain amount of nitrogen is injected, the pressure regulating valve 2 and the second stop valve 6 are disconnected, pressure changes of the first pressure sensor 13, the second pressure sensor 14, the third pressure sensor 15, the fourth pressure sensor 26 and the fifth pressure sensor 5 are observed, when the pressure changes of all the five pressure sensors do not exceed 0.05MPa, the air tightness is considered to be good, and the first electromagnetic valve 7, the second electromagnetic valve 8, the third electromagnetic valve 9, the fourth electromagnetic valve 16, the fifth electromagnetic valve 17, the sixth electromagnetic valve 20 and the seventh electromagnetic valve 21 are disconnected.
(4) And calibrating the volume of the coal sample tank.
After the air tightness is checked to be qualified, the pressure regulating valve 2, the second stop valve 6 and the second electromagnetic valve 8 are connected, the high-pressure nitrogen in the high-pressure steel cylinder 1 is injected into the balance tank 3 again, the nitrogen in the balance tank 3 is injected into the reference tank 11, when the first set pressure is reached, the pressure regulating valve 2, the second stop valve 6 and the second electromagnetic valve 8 are disconnected, and the volume of the reference tank 11 is calculated; then, the pressure regulating valve 2, the second stop valve 6 and the first electromagnetic valve 7 are connected, high-pressure nitrogen in the high-pressure steel cylinder 1 is injected into the balance tank 3, then the nitrogen in the balance tank 3 is injected into the first coal sample inner tank, when the pressure in the first coal sample tank 10 is equal to the pressure in the reference tank 11, the pressure regulating valve 2, the second stop valve 6 and the first electromagnetic valve 7 are disconnected, and the calibrated volume of the first coal sample tank 10 is calculated; similarly, the calibrated volume of the second coal sample tank 12 can be obtained, and the calibration of the volume of the fixed space is required after each experiment for coal charging, so as to ensure the accuracy and reliability of the experiment result.
(5) First degassing.
After the volume of the calibrated coal sample tank is finished, a first stop valve 4, a fourth electromagnetic valve 16, a fifth electromagnetic valve 17, a sixth electromagnetic valve 20, a seventh electromagnetic valve 21, an eighth electromagnetic valve 27 and a degassing pump 28 are connected, and are used for exhausting gas in the balance tank 3, the reference tank 11, the first coal sample tank 10, the second coal sample tank 12 and the fixed space component 25; when the preset degassing time is reached, the first stop valve 4, the fourth electromagnetic valve 16, the fifth electromagnetic valve 17, the sixth electromagnetic valve 20, the seventh electromagnetic valve 21, the eighth electromagnetic valve 27 and the degassing pump 28 are disconnected.
(6) And balancing the coal sample adsorption.
After degassing is finished, the pressure regulating valve 2 is connected, high-pressure gas is filled into the balance tank 3 through the high-pressure steel cylinder 1, then the second stop valve 6, the first electromagnetic valve 7 and the third electromagnetic valve 8 are connected, the gas filled into the first coal sample tank 10 and the second coal sample tank 12 is respectively connected, so that the gas filling is finished when the pressure in the first coal sample tank 10 and the pressure in the second coal sample tank 12 reach preset pressures, at the moment, the second stop valve 6, the first electromagnetic valve 7 and the third electromagnetic valve 8 of the pressure regulating valve 2 are disconnected, and when the pressure change in the first coal sample tank 10 and the pressure change in the second coal sample tank 12 do not exceed 1%, the first coal sample tank 10 and the second coal sample tank 12 are considered to reach adsorption balance.
(7) And injecting a surfactant.
1. The surfactant is injected once.
And after the adsorption of the coal sample is balanced, switching on the liquid injection pump 24, the metering pump 23, the check valve 22 and the third stop valve 18, injecting the surfactant at a fixed pressure and a fixed quantity at one time, automatically stirring the mixed liquid of the surfactant and the water by the stirrer in the first coal sample tank 10, observing the change of the first pressure sensor 13, determining that the coal sample is adsorbed and balanced again when the change of the first pressure sensor 13 is not more than 1%, and switching off the liquid injection pump 24, the metering pump 23, the check valve 22 and the third stop valve 18 after the balance.
2. And injecting the surfactant in stages.
After the coal sample is adsorbed and balanced, a liquid injection pump 24, a metering pump 23, a one-way valve 22 and a fourth stop valve 19 are connected, firstly, a surfactant is injected in a constant pressure and quantitative mode, a stirrer in a second coal sample tank 12 automatically stirs a mixed liquid of the surfactant and water, the change of a third pressure sensor 15 is observed, and when the change of the third pressure sensor 15 does not exceed 1%, the coal sample is considered to be adsorbed and balanced again; and (3) fixing the pressure again, and injecting the surfactant quantitatively until the dosage of the injected surfactant is equal to that of the surfactant injected at one time, the pressure is equal, and the change of the third pressure sensor 15 is not more than 1%, determining that the coal sample is adsorbed and balanced again, and disconnecting the liquid injection pump 24, the metering pump 23, the one-way valve 22 and the fourth stop valve 19 after balancing. (the injection of the surfactant in the experimental stages can be set according to the experimental requirements).
(8) The one-time injection of surfactant desorbs the gas to the fixed space assembly 25.
After the injected surfactant is adsorbed and balanced, the sixth electromagnetic valve 20 is switched on, at this time, the gas in the first coal sample tank 10 is desorbed into the fixed space component 25, at this time, the fourth pressure sensor 26 is recorded to detect the pressure change in the fixed space component 25, until the pressure change of the gas in the fixed space component 25 does not exceed 0.05MPa, the desorption experiment of the first coal sample tank 10 is ended, the pressure change in the fixed space component 25 in the whole process is recorded, and a first gas desorption curve is drawn according to the pressure change in the fixed space component 25.
(9) And (5) degassing for the second time.
The eighth electromagnetic valve 27 and the degassing pump 28 are connected to degas the fixed space assembly 25 and the pipeline; when degassing is completed, the eighth electromagnetic valve 27 and the degassing pump 28 are turned off.
(10) Staged injection of surfactant desorbs gas to the solid space components.
And (3) switching on the seventh electromagnetic valve 21, desorbing the gas in the second coal sample tank 12 to the fixed space component 25 at the moment, recording the pressure change in the fixed space component 25 detected by the fourth pressure sensor 26 at the moment until the pressure change of the gas in the fixed space component 25 is not more than 0.05MPa, finishing the desorption experiment of the second coal sample tank 12, recording the pressure change in the fixed space component 25 in the whole process, and drawing a second gas desorption curve according to the pressure change in the fixed space component 25.
(11) And degassing for the third time.
The eighth electromagnetic valve 27 and the degassing pump 28 are connected to degas the fixed space assembly 25 and the pipeline; when degassing is completed, the eighth electromagnetic valve 27 and the degassing pump 28 are turned off.
(12) And finishing the experiment.
And finishing the experiment, and finishing the device, comparing the characteristics of the first coal sample gas desorption curve and the second coal sample gas desorption curve to obtain the optimal injection modes in different states, thereby providing convenience conditions for selecting the mode of injecting the surfactant for subsequent engineering.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (7)
1. An apparatus for injecting a surfactant, the apparatus comprising:
the gas storage component is used for adjusting the pressure of the high-pressure gas to obtain gas required by the experiment;
the liquid injection assembly is used for injecting the surfactant quantitatively and at constant pressure;
the first coal sample tank is used for storing a coal sample; the first input end of the first coal sample tank is connected with the gas storage component and used for receiving gas; the second input end of the first coal sample tank is connected with the liquid injection assembly and is used for receiving the surfactant injected at one time in a quantitative and constant pressure mode;
the second coal sample tank is used for storing the coal sample; the first input end of the second coal sample tank is connected with the gas storage assembly and is used for receiving gas; a second input end of the second coal sample tank is connected with the liquid injection assembly and is used for receiving surfactant which is injected by stages in a quantitative and constant-pressure mode;
the fixed space assembly is respectively connected with the first output end of the first coal sample tank and the first output end of the second coal sample tank and is used for storing gas desorbed from the first coal sample tank or the second coal sample tank;
the fourth pressure sensor is arranged in the fixed space assembly and used for detecting the pressure of the gas desorbed from the coal sample in the fixed space assembly;
the calibration component is respectively connected with the gas storage component, the first coal sample tank and the second coal sample tank and is used for respectively calibrating the volume of the first coal sample tank and the volume of the second coal sample tank;
the calibration assembly comprises:
the second electromagnetic valve is connected with the gas storage assembly and is used for adjusting the flow and the speed of nitrogen gas filling;
the reference tank is connected with the second electromagnetic valve and used for storing nitrogen;
a second pressure sensor disposed in the reference tank for detecting a pressure in the reference tank;
the fourth electromagnetic valve is respectively connected with the reference tank and the third input end of the second coal sample tank and is used for adjusting the flow and the speed of the nitrogen flowing out of the reference tank;
the fifth electromagnetic valve is respectively connected with the reference tank and the third input end of the first coal sample tank and is used for adjusting the flow and the speed of the nitrogen flowing out of the reference tank;
the degassing assembly is connected with the fixed space assembly and is used for exhausting gas in the fixed space assembly, the first coal sample tank, the second coal sample tank and the reference tank;
the liquid injection assembly comprises:
the liquid injection pump is used for injecting the surfactant at constant pressure;
the metering pump is connected with the liquid injection pump and is used for quantitatively injecting the surfactant;
the one-way valve is connected with the metering pump and used for controlling the directional injection of the surfactant;
the third stop valve is respectively connected with the one-way valve and the second input end of the first coal sample tank and is used for controlling the on-off of the surfactant injected into the first coal sample tank;
and the fourth stop valve is respectively connected with the one-way valve and the second input end of the second coal sample tank and is used for controlling the on-off of the surfactant injected into the second coal sample tank.
2. The surfactant injecting apparatus according to claim 1, wherein the gas storage module comprises:
the high-pressure steel cylinder is used for storing high-pressure gas, and the high-pressure gas is high-pressure nitrogen or high-pressure gas;
the pressure regulating valve is connected with the high-pressure steel cylinder and is used for regulating the pressure of high-pressure gas in the high-pressure steel cylinder to obtain gas required by an experiment, and the gas is nitrogen or gas;
the balance tank is connected with the pressure regulating valve and is used for receiving gas generated by the pressure regulating valve;
the second stop valve is connected with the balance tank and used for controlling the gas circulation in the balance tank;
the fifth pressure sensor is arranged in the balance tank and used for detecting the pressure in the balance tank;
and the first stop valve is connected with the balance tank and is used for exhausting gas in the balance tank.
3. The surfactant injection apparatus as recited in claim 1, further comprising:
and the constant temperature control assembly is used for enabling the first coal sample tank, the reference tank and the second coal sample tank to work at a first set temperature and enabling the fixed space assembly to work at a second set temperature.
4. A surfactant injection apparatus as claimed in claim 3, wherein the thermostatic control assembly comprises:
the first water tank is used for enabling the first coal sample tank, the reference tank and the second coal sample tank to work at a first set temperature;
the first temperature sensor is placed in the first water tank and used for detecting the temperature of water in the first water tank;
the first stirrer is placed in the first water tank and is used for stirring water in the first water tank to enable the water temperature to be uniform;
a first heater disposed in the first water tank for heating water in the first water tank;
a second water tank for operating the fixed space assembly at a second set temperature;
the second temperature sensor is placed in the second water tank and used for detecting the water temperature in the second water tank;
the second stirrer is placed in the second water tank and is used for stirring the water in the second water tank to ensure that the water temperature is uniform;
and the second heater is placed in the second water tank and used for heating the water in the second water tank.
5. A surfactant injection apparatus as claimed in claim 1, wherein the degas assembly comprises:
the eighth electromagnetic valve is connected with the fixed space assembly and is used for adjusting the flow and the speed of the gas flowing out;
and the degassing pump is connected with the eighth electromagnetic valve and is used for exhausting gas in the fixed space assembly, the first coal sample tank, the second coal sample tank and the reference tank.
6. The surfactant injection apparatus according to claim 2, further comprising:
the first electromagnetic valve is connected with the second stop valve, and the third electromagnetic valve is connected with the second stop valve and used for adjusting the flow and the speed of gas filling;
the sixth electromagnetic valve is connected with the first output end of the first coal sample tank, and the seventh electromagnetic valve is connected with the first output end of the second coal sample tank and used for adjusting the flow and the speed of gas outflow;
the first pressure sensor is placed in the first coal sample tank and used for detecting the pressure in the first coal sample tank;
the third pressure sensor is placed in the second coal sample tank and used for detecting the pressure in the second coal sample tank;
the first ball valve is arranged at the second output end of the first coal sample tank and used for discharging the solution with the surfactant in the first coal sample tank;
and the second ball valve is arranged at the second output end of the second coal sample tank and is used for discharging the solution with the surfactant in the second coal sample tank.
7. The surfactant injection apparatus of claim 1, further comprising: and the drawing component is connected with the fourth pressure sensor and used for drawing and displaying a gas desorption curve according to the pressure of the gas.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710671643.2A CN107387154B (en) | 2017-08-08 | 2017-08-08 | Device for injecting surfactant |
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| CN201710671643.2A CN107387154B (en) | 2017-08-08 | 2017-08-08 | Device for injecting surfactant |
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| CN107387154B true CN107387154B (en) | 2023-03-14 |
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| CN102748061A (en) * | 2012-07-13 | 2012-10-24 | 中国矿业大学(北京) | Mining surfactant automatic adding device |
| CN103776979B (en) * | 2014-01-10 | 2016-02-24 | 河南理工大学 | A kind of coal seam water infusion suppresses analog detection method and the device of desorption of mash gas effect |
| CN104453794B (en) * | 2014-11-20 | 2017-05-17 | 中国科学院广州能源研究所 | Simulation experiment system for whole process of natural gas hydrate exploitation and simulation method |
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