CN111595921B - Shale oil gas field detection device - Google Patents
Shale oil gas field detection device Download PDFInfo
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- CN111595921B CN111595921B CN201910127677.4A CN201910127677A CN111595921B CN 111595921 B CN111595921 B CN 111595921B CN 201910127677 A CN201910127677 A CN 201910127677A CN 111595921 B CN111595921 B CN 111595921B
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- 238000001514 detection method Methods 0.000 title claims abstract description 44
- 239000003079 shale oil Substances 0.000 title claims abstract description 25
- 239000007788 liquid Substances 0.000 claims abstract description 30
- 238000000034 method Methods 0.000 claims abstract description 24
- 238000005259 measurement Methods 0.000 claims abstract description 15
- 238000001914 filtration Methods 0.000 claims abstract description 13
- 238000001819 mass spectrum Methods 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 238000010926 purge Methods 0.000 claims description 9
- 238000004891 communication Methods 0.000 claims description 8
- 238000002347 injection Methods 0.000 claims description 8
- 239000007924 injection Substances 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 6
- 238000012360 testing method Methods 0.000 claims description 6
- 238000012935 Averaging Methods 0.000 claims description 5
- GNFTZDOKVXKIBK-UHFFFAOYSA-N 3-(2-methoxyethoxy)benzohydrazide Chemical compound COCCOC1=CC=CC(C(=O)NN)=C1 GNFTZDOKVXKIBK-UHFFFAOYSA-N 0.000 claims description 3
- 238000007605 air drying Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 239000000243 solution Substances 0.000 claims description 3
- 238000013459 approach Methods 0.000 claims description 2
- -1 concentration Substances 0.000 claims description 2
- 238000001035 drying Methods 0.000 claims description 2
- 238000005406 washing Methods 0.000 claims description 2
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical class [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims 1
- 238000003825 pressing Methods 0.000 claims 1
- 238000011010 flushing procedure Methods 0.000 abstract description 9
- 239000007791 liquid phase Substances 0.000 abstract description 4
- 238000000926 separation method Methods 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 97
- 238000001179 sorption measurement Methods 0.000 description 9
- 238000003795 desorption Methods 0.000 description 3
- 239000005416 organic matter Substances 0.000 description 3
- 238000007689 inspection Methods 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 238000011045 prefiltration Methods 0.000 description 1
- 230000002285 radioactive effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/62—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode
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Abstract
The shale oil gas field detection device comprises a gas collecting cylinder, a pressure balance tank, a filtering device, a pre-filtering device, a mass spectrum analyzer, an industrial personal computer and a printer; the device can greatly reduce waiting time of shale oil gas acquisition decision, can automatically detect gas components, display detection results through display equipment, has various expression modes, can operate the system without professional knowledge (only needs to control an opening button and a closing button), integrates an automatic flushing function, automatically flushes detected equipment, greatly improves feasibility of on-site operation, has proper volume, can be configured on a mobile vehicle, and is suitable for shale oil gas component detection under various conditions; the gas-liquid separation, liquid phase volume and mass measurement, gas total amount measurement, on-line measurement of gas components and concentration and automatic flushing of equipment can be realized, the volume is moderate, and the field operability is extremely strong; the measurement can be realized for the gas under the pressure in a larger range, and the method has larger social significance and practical value.
Description
Technical Field
The patent relates to the field of shale oil gas field detection, in particular to a shale oil gas field detection device.
Background
The existing shale gas content testing methods include a desorption method, an isothermal adsorption method, a logging interpretation method and the like. The desorption method is a direct method for measuring the shale gas content, is also the most commonly used method, can reflect the gas content characteristics of shale under the condition of simulating the actual environment of a stratum, and is used as a basic method for measuring the shale gas content, but the method has long time consumption and larger error; isothermal adsorption and well logging interpretation are indirect methods of shale gas content determination. Isothermal adsorption is the reverse process of desorption, adsorption characteristics and capacity of the shale rich in organic matters can be studied through isothermal adsorption simulation, and adsorption gas content parameter data are obtained, but for shale gas with small adsorption state quantity, an isothermal adsorption method is not suitable, and errors are large; the logging interpretation method is a method for obtaining shale gas content through logging information interpretation, firstly, a rock-electricity relation is established, including the relation between rock density and organic matter content, radioactive matter content and organic matter content, organic matter content and gas content and the like, and then the adsorption gas content, free gas content and total gas content are interpreted through logging information, but at present, the rock-electricity relation of shale gas in China is not effectively established.
Disclosure of Invention
Aiming at the defects in shale oil gas detection equipment and a shale oil gas detection method, the patent aims to provide a shale oil gas on-site detection device which can realize gas-liquid separation, liquid phase volume and mass measurement, gas total amount measurement, gas component and concentration on-line measurement and equipment automatic flushing, has moderate volume and extremely strong on-site operability, and has the following technical scheme:
the shale oil gas field detection device comprises a first pipeline, wherein the first pipeline is sequentially communicated with a gas cylinder, a third electromagnetic valve, a pressure balance tank, a fourth electromagnetic valve, a first three-way pipe, a twelfth electromagnetic valve, a filtering device, a front filtering device and a mass spectrometer from left to right; the second pipeline is sequentially communicated with a pressure balance tank, a seventh electromagnetic valve, a second three-way pipe, an eleventh electromagnetic valve, a cylinder pressurizing device, an eighth electromagnetic valve and a first three-way pipe from left to right, the cylinder pressurizing device consists of a cylinder and a piston, the piston divides the cylinder into a first chamber and a second chamber, the first chamber is communicated with the eleventh electromagnetic valve, and the second chamber is communicated with the eighth electromagnetic valve; the third pipeline is sequentially communicated with the pressure balance tank, the sixth electromagnetic valve, the third three-way pipe, the ninth electromagnetic valve and the first chamber from left to right; the pressure balance tank is further provided with a thermometer and a pressure gauge, the second three-way pipe is further communicated with a blower, and the third three-way pipe is further communicated with a vacuum pump.
Further, still be equipped with water injection pipe, first blast pipe, outlet pipe on the pressure balance jar, still communicate the second blast pipe on the outlet pipe, the back end of outlet pipe and second blast pipe link is equipped with the second solenoid valve, be equipped with tenth solenoid valve on the second blast pipe, be equipped with first solenoid valve on the water injection pipe.
Further, saturated NaHCO 3 solution is filled in the filtering device.
Further, the tail end of the water outlet pipe is communicated with the liquid storage barrel.
Further, an electronic scale is arranged below the liquid storage barrel.
Further, the mass spectrometer further comprises an industrial personal computer and a printer, wherein the industrial personal computer is in communication connection with the mass spectrometer, and the printer is in communication connection with the industrial personal computer.
The detection method of the shale oil gas field detection device comprises the following steps:
a. Starting the system, displaying according to a software login interface, and inputting a user name and a password; after the input is correct, starting system initialization;
b. Initializing a system, closing all electromagnetic valves, reading pressure gauge parameters of a pressure balance tank, and normally starting to work if the parameters can be about equal to 1 atmosphere;
c. And opening a sixth electromagnetic valve, a fourth electromagnetic valve, an eighth electromagnetic valve and an eleventh electromagnetic valve, starting a vacuum pump until the reading number 3s of the pressure gauge is unchanged, wherein the balance tank and the main pipeline are in vacuum, the cylinder piston falls to the lowest, and closing the sixth electromagnetic valve, the fourth electromagnetic valve, the eighth electromagnetic valve and the eleventh electromagnetic valve, and closing the vacuum pump. Ending the initialization of the system;
d. Opening a third electromagnetic valve, pushing all the gas to be measured into the balance tank, standing for 5 minutes, and selecting an operation flow direction according to the reading of the pressure gauge: if the pressure in the balance tank reaches 0.2MPa, executing the steps e-f, j-n; if the pressure is less than 0.001MPa or the standard atmospheric pressure of the gas in the gas cylinder is less than 3 liters, discarding the measurement and executing the process j-n; if the pressure is higher than 0.001MPa and lower than 0.2MPa, starting a cylinder pressurizing device, and executing a flow g-n; immediately closing the third electromagnetic valve, recording the readings of the pressure gauge and the thermometer 31, and calculating the total volume of the gas in the balance tank; according to the ideal gas state equation:
PV＝nRT(Ⅰ)
The finishing method can obtain:
in the formula (II), P is the gas pressure, V is the gas volume, n is the mol number of the gas, R is a constant, and T is the temperature.
It follows that the right formula in this device is a constant value, namely:
The volume V 1 of the device is 300L, and the pressure P 1 and the temperature T 1 can be measured by a pressure gauge and a thermometer respectively; right side P 2 of equation (iii) is a standard atmospheric pressure and T 2 is room temperature 25 ℃. Thus, the gas volume V 2 can be determined;
e. The fourth electromagnetic valve and the twelfth electromagnetic valve are opened, the gas volume in the balance tank is monitored, after 3 liters of gas is discharged, the atmosphere in the pipeline after the twelfth electromagnetic valve 12 is purged, the sample to be tested is prevented from being polluted, the mass spectrum analyzer 21 is opened for first detection, and the detection result is recorded, wherein the detection result comprises gas components and concentration;
f. Performing multiple detection by a mass spectrometer 21, storing data, and performing multiple detection and averaging to obtain a statistical result of gas components and concentrations;
g. Starting a vacuum pump, sucking low-pressure or negative-pressure gas in a balance tank, wherein the volume of the balance tank is 300 liters, the volume of a cylinder is 3 liters, and synchronously detecting that if the pressure of the gas in the balance tank is reduced by 3/300 or a cylinder piston approaches the top of the cylinder, closing the fourth electromagnetic valve, the ninth electromagnetic valve and the vacuum pump, starting an eleventh electromagnetic valve and a blower, and after 10 seconds, starting a twelfth electromagnetic valve;
h. Purging the atmosphere in the pipeline after the twelfth electromagnetic valve to avoid polluting the tested sample;
i. repeating the step g, starting the mass spectrum analyzer 21, detecting for a plurality of times, storing data, and closing all electromagnetic valves. Averaging the stored gas components and concentration results to obtain statistical results;
j. And (3) purging: opening a fifth electromagnetic valve, discharging residual gas in the balance tank, executing the operation when the pressure of the residual gas is larger than 0.1MPa when the reading is smaller than 0.105MPa, and ignoring the operation if the pressure of the residual gas is smaller than the reading; starting a seventh electromagnetic valve, starting a blower, and running for 5 minutes; closing the fifth electromagnetic valve 5, opening the fourth electromagnetic valve, the twelfth electromagnetic valve and the eighth electromagnetic valve, continuing to purge for 3 minutes, pushing residual gas in the pipeline into the atmosphere, closing all the electromagnetic valves, and closing the blower;
k. Opening a second electromagnetic valve, discharging the liquid in the pressure balance tank into a liquid storage barrel, measuring the mass of the liquid by using an electronic scale, and storing the liquid into a system;
Washing: opening a first electromagnetic valve, placing 0.1m 3 of liquid, closing the first electromagnetic valve, standing for at least 5min, opening a tenth electromagnetic valve, and discharging the liquid to the outside;
And (m) air drying: opening a fifth electromagnetic valve and a seventh electromagnetic valve, opening a blower, operating for at least 15 minutes, drying the tank body, prompting that the detection is finished, and obtaining all detection results: gas composition, concentration, liquid mass.
The beneficial effect of this patent is:
The device can greatly reduce the waiting time of shale oil gas acquisition decision, realizes high automation, can automatically detect gas components, displays detection results through display controls, has various expression modes (optional), and can operate the system without professional knowledge (only needs to control opening and closing buttons). The device also integrates an automatic flushing function, can realize automatic flushing of equipment after detection, and greatly improves the feasibility of field operation. The device has proper volume, can be configured on a moving vehicle, and can be suitable for shale oil gas component detection under various conditions; the gas-liquid separation, liquid phase volume and mass measurement, gas total amount measurement, gas component and concentration on-line measurement and automatic flushing of equipment can be realized, the volume is moderate, and the field operability is extremely strong; the measurement can be realized for the gas under the pressure in a larger range, and the method has larger social significance and practical value.
Drawings
FIG. 1 is an overall block diagram of a shale oil and gas field inspection device;
FIG. 2 is a flow chart of a detection method of a shale oil and gas field detection device;
in the figure: 1. the first solenoid valve, 2, the second solenoid valve, 3, the third solenoid valve, 4, the fourth solenoid valve, 5, the fifth solenoid valve, 6, the sixth solenoid valve, 7, the seventh solenoid valve, 8, the eighth solenoid valve, 9, the ninth solenoid valve, 10, the tenth solenoid valve, 11, the eleventh solenoid valve, 12, the twelfth solenoid valve, 13, the first line, 14, the second line, 15, the third line, 16, the gas cylinder, 17, the pressure balance tank, 18, the first tee, 19, the filter device, 20, the prefilter, 21, the mass spectrometer, 22, the printer, 23, the industrial computer, 24, the blower, 25, the cylinder pressurizing device, 26, the piston, 27, the first chamber, 28, the second chamber, 29, the vacuum pump, 30, the water injection pipe, 31, the thermometer, 32, the pressure gauge, 33, the first exhaust pipe, 34, the second exhaust pipe, 35, the water outlet pipe, 36, the electronic scale, 37, the channel, 38, the standard gas tank, 39, the liquid storage tank.
Detailed Description
The following is one of the preferred embodiments of this patent:
Referring to fig. 1, a shale oil gas field inspection apparatus comprises a gas cylinder 16, a vacuum pump 29, a blower 24, a pressure balance tank 17, a filtering device 19, a cylinder pressurizing device 25, a mass spectrometer 21, and an industrial control computer (hereinafter referred to as industrial personal computer 23), wherein pressure parameters are used as main control parameters, and the pressure is gradually decreased.
The first pipeline 13, the first pipeline 13 is communicated with the gas cylinder 16, the third electromagnetic valve 3, the pressure balance tank 17, the fourth electromagnetic valve 4, the first three-way pipe 18, the twelfth electromagnetic valve 12, the filtering device 19, the pre-filtering device 20 and the mass spectrometer 21 from left to right.
The second pipeline 14 is sequentially communicated with a pressure balance tank 17, a seventh electromagnetic valve 7, a second three-way pipe, an eleventh electromagnetic valve 11, a cylinder pressurizing device 25, an eighth electromagnetic valve 8 and a first three-way pipe 18 from left to right, the cylinder pressurizing device 25 is composed of a cylinder and a piston 26, the piston 26 divides the cylinder into a first chamber 27 and a second chamber 28, the first chamber 27 is communicated with the eleventh electromagnetic valve 11, and the second chamber 28 is communicated with the eighth electromagnetic valve 8.
The third pipeline 15 is sequentially communicated with the pressure balance tank 17, the sixth electromagnetic valve 6, the third three-way pipe, the ninth electromagnetic valve 9 and the first chamber 27 from left to right.
The pressure balance tank 17 is further provided with a thermometer 31 and a pressure gauge 32, the second three-way pipe is further communicated with the blower 24, the third three-way pipe is further communicated with the vacuum pump 29, the pressure balance tank 17 is further provided with a water injection pipe 30, a first exhaust pipe 33 and a water outlet pipe 35, the first exhaust pipe 33 is provided with a fifth electromagnetic valve 5, the water outlet pipe 35 is further communicated with a second exhaust pipe 34, the rear section of the communication end of the water outlet pipe 35 and the second exhaust pipe 34 is provided with a second electromagnetic valve 2, the second exhaust pipe 34 is provided with a tenth electromagnetic valve 10, the water injection pipe 30 is provided with a first electromagnetic valve 1, the industrial personal computer 23 is in communication connection with the mass spectrometer 21, the printer 22 is in communication connection with the industrial personal computer 23, the third electromagnetic valve 3 is a pressure valve, the front filtering device 20 is communicated with the mass spectrometer 21 through a plurality of channels 37 which are communicated in parallel, and the mass spectrometer 21 is further communicated with a plurality of standard gas tanks 38, and standard gas is filled in the mass spectrometer 21.
Gas cylinder 16: shale formation hydrocarbons are collected and, with this as the object of measurement, pressed into the pressure equalization tank 17.
Pressure balance tank 17: the device has the functions of stabilizing and uniformly mixing the gases, and preventing the influence of the layering phenomenon of the gases on the detection precision.
Front filter device 20: the secondary filtration is carried out on dust and liquid in the gas, so that the detection precision of liquid phase and gas phase can be improved to a certain extent.
Cylinder pressurizing device 25: the gas to be measured in the pressure equalization tank 17 is pushed into the filter device 19 and the mass spectrometer 21 by the piston 26.
Filter device 19: some acid gases in shale oil and gas that may corrode subsequent devices are filtered out by saturated NaHCO 3 solution.
Mass spectrometer 21: the function of detecting the gas components is realized, the input gas components can be monitored on line in real time, and the detection result is sent to the industrial personal computer 23.
The industrial personal computer 23: and installing oilfield management software, connecting with an oilfield automation system, realizing logic control of the whole system, and unifying the results in display equipment (such as a display, a display screen and the like) for expression.
Referring to fig. 1 and 2, a device flushing flow and a detection flow of a shale oil gas field detection device are as follows:
a. Starting the system, displaying according to a software login interface, and inputting a user name and a password; after the input is correct, system initialization is started.
B. The initialization content comprises: all solenoid valves are closed and the parameters of the pressure gauge 32 of the pressure balance tank 17, which may be approximately equal to 1 atmosphere, are read, and the operation is normally started.
C. The sixth solenoid valve 6, the fourth solenoid valve 4, the eighth solenoid valve 8, the eleventh solenoid valve 11 are opened, the vacuum pump 29 is opened until the reading 3s of the pressure gauge 32 is unchanged (the balance tank and the main pipe are vacuum, the cylinder piston 26 falls to the lowest), the sixth solenoid valve 6 is closed, the fourth solenoid valve 4, the eighth solenoid valve 8, the eleventh solenoid valve 11 are closed, and the vacuum pump 29 is closed. And (5) ending the system initialization.
D. the third electromagnetic valve 3 (the pressure valve between the pressure balance tank 17 and the gas cylinder 16) is opened, all the gas to be measured is pushed into the balance tank, and the gas to be measured is left to stand for 5 minutes (the gas dissolved in the liquid is slowly released), and the operation flow direction is selected according to the reading of the pressure gauge 32: (1) Executing the processes e-f and j-n when the pressure in the balance tank reaches 0.2 MPa; (2) If the pressure is less than 0.001MPa (namely, the gas in the gas cylinder 16 is less than 3 liters under the standard atmospheric pressure), the measurement is abandoned, and the process j-n is executed; (3) The pressure is greater than 0.001MPa and less than 0.2MPa, and the cylinder (pressurizing device) is started to execute the flow g-n. Immediately closing the third electromagnetic valve 3, recording the readings of the pressure gauge 32 and the thermometer 31, and calculating the total volume of the gas in the balance tank. According to the ideal gas state equation:
PV＝nRT(Ⅰ)
The finishing method can obtain:
in the formula (II), P is the gas pressure, V is the gas volume, n is the mol number of the gas, R is a constant, and T is the temperature.
It follows that the right formula in this device is a constant value, namely:
The volume V 1 of the device is 300L, and the pressure P 1 and the temperature T 1 can be measured by a pressure gauge 32 and a temperature gauge 31 respectively; right side P 2 of equation (iii) is a standard atmospheric pressure and T 2 is room temperature 25 ℃. The gas volume V 2 can thus be determined.
E. The fourth and twelfth solenoid valves 4 and 12 are opened, the gas volume in the balance tank is monitored (calculated in real time by pressure and temperature), after 3 liters of gas are discharged (atmosphere in the pipeline after the twelfth solenoid valve 12 is purged to avoid polluting the sample to be measured), the mass spectrometer 21 is opened for the first time, and the detection result (gas component and concentration) is recorded.
F. the mass spectrometer 21 performs a plurality of tests, saves the data, and averages a plurality of times to give statistics of the gas composition and concentration.
G. The fourth solenoid valve 4, the eighth solenoid valve 8 and the ninth solenoid valve 9 are opened, the vacuum pump 29 is started, the low pressure or negative pressure gas in the pressure balance tank 17 is sucked, if the pressure of the gas in the pressure balance tank 17 is synchronously detected to be reduced by 3/300 (namely, the piston 26 is close to the top of the cylinder, the volume of the pressure balance tank 17 is 300 liters, and the volume of the cylinder is 3 liters), the fourth solenoid valve 4, the ninth solenoid valve 9 and the vacuum pump 29 are closed, the eleventh solenoid valve 11 and the blower 24 are opened, and after 10 seconds, the twelfth solenoid valve 12 is opened.
H. purging the atmosphere in the tubing after the twelfth solenoid valve 12 avoids contaminating the sample being tested.
I. Repeating the step g, starting the mass spectrum analyzer 21, detecting for a plurality of times, storing data, and closing all electromagnetic valves; and averaging the stored gas components and concentration results to give statistical results.
J. And (3) purging: the fifth solenoid valve 5 is opened, the residual gas in the balance tank is discharged until the reading is less than 0.105MPa (when the pressure of the residual gas is greater than 0.1MPa, the present operation is performed, and if it is less than this value, the present operation is ignored). The seventh solenoid valve 7 is opened, the blower 24 is turned on, and the operation is performed for 5 minutes (the parameter can be re-selected). The fifth electromagnetic valve 5 is closed, the fourth electromagnetic valve 4, the twelfth electromagnetic valve 12 and the eighth electromagnetic valve 8 are opened, purging is continued for 3 minutes, and residual gas in the pipeline is pushed into the atmosphere. All solenoid valves are closed, and blower 24 is turned off.
K. The second electromagnetic valve 2 is opened, the liquid in the pressure balance tank 17 is discharged into the liquid storage barrel 39, and the mass (the mass of the liquid) is measured by using the electronic scale 36 and stored in the industrial personal computer system.
Y. flushing: the first solenoid valve 1 (water injection pipe 30 is connected with an external tap water pipeline) is opened, 0.1m 3 of liquid is put in (or time is counted), the first solenoid valve 1 is closed, the first solenoid valve is kept stand for 5min (time is self-determined), the tenth solenoid valve 10 is opened, and the liquid is discharged to the outside.
And I, air drying: the fifth electromagnetic valve 5 and the seventh electromagnetic valve 7 are opened, the blower 24 is started, the operation is performed for 15 minutes (the parameters can be reselected), and the tank body of the pressure balance tank 17 is dried.
And m, prompting that the detection is finished, and outputting all detection results (gas components, concentration and liquid quality).
The final objective of the invention is that the developed shale oil gas field detection device can automatically detect gas components and integrate an automatic flushing function, the detection result is displayed through a display control, various expression modes (optional) are provided, and the system can be operated without professional knowledge (only the opening and closing buttons are controlled); the feasibility of on-site operation is greatly improved, and the device has proper volume, can be configured on a moving vehicle, and can be suitable for shale oil gas component detection under various conditions; and the method is applicable to a wide range of pressure conversion conditions.
Claims (4)
1. The shale oil gas field detection device is characterized by comprising a first pipeline (13), wherein the first pipeline (13) is sequentially communicated with a gas cylinder (16), a third electromagnetic valve (3), a pressure balance tank (17), a fourth electromagnetic valve (4), a first three-way pipe (18), a twelfth electromagnetic valve (12), a filtering device, a front filtering device (20) and a mass spectrometer (21) from left to right; the second pipeline (14) is sequentially communicated with the pressure balance tank (17), the seventh electromagnetic valve (7), the second three-way pipe, the eleventh electromagnetic valve (11), the cylinder pressurizing device (25), the eighth electromagnetic valve (8) and the first three-way pipe (18) from left to right, the cylinder pressurizing device (25) is composed of a cylinder and a piston (26), the piston (26) divides the cylinder into a first chamber (27) and a second chamber (28), the first chamber (27) is communicated with the eleventh electromagnetic valve (11), and the second chamber (28) is communicated with the eighth electromagnetic valve (8); the third pipeline (15) is sequentially communicated with the pressure balance tank (17), the sixth electromagnetic valve (6), the third three-way pipe, the ninth electromagnetic valve (9) and the first chamber (27) from left to right; the pressure balance tank (17) is further provided with a thermometer (31) and a pressure gauge (32), the second three-way pipe is further communicated with the air blower (24), and the third three-way pipe is further communicated with the vacuum pump (29);
The pressure balance tank (17) is further provided with a water injection pipe (30), a first exhaust pipe (33) and a water outlet pipe (35), the water outlet pipe (35) is further communicated with a second exhaust pipe (34), the rear section of the communication end of the water outlet pipe (35) and the second exhaust pipe (34) is provided with a second electromagnetic valve (2), the second exhaust pipe (34) is provided with a tenth electromagnetic valve (10), and the water injection pipe (30) is provided with a first electromagnetic valve (1);
Saturated NaHCO3 solution is filled in the filtering device;
The device also comprises an industrial personal computer (23) and a printer (22), wherein the industrial personal computer (23) is in communication connection with the mass spectrometer (21), and the printer (22) is in communication connection with the industrial personal computer (23);
Gas cylinder (16): collecting shale stratum oil gas, taking the shale stratum oil gas as a measuring object, and pressing the gas into a pressure balance tank (17); industrial personal computer (23): and installing oilfield management software, connecting with an oilfield automation system, realizing logic control of the whole system, and unifying the results in display equipment for expression.
2. Shale oil and gas field testing device according to claim 1, characterized in that the end of the water outlet pipe (35) is connected with a liquid storage barrel (39).
3. Shale oil and gas field testing device according to claim 2, characterized in that an electronic scale (36) is arranged below the liquid storage barrel (39).
4. The method for testing a shale oil and gas field testing apparatus as claimed in claim 3, comprising the steps of:
a. Starting the system, displaying according to a software login interface, and inputting a user name and a password; after the input is correct, starting system initialization;
b. Initializing a system, closing all electromagnetic valves, reading parameters of a pressure gauge (32) of a pressure balance tank (17), and normally starting to work if the parameters are equal to 1 atmosphere;
c. Opening a sixth electromagnetic valve (6), a fourth electromagnetic valve (4), an eighth electromagnetic valve (8) and an eleventh electromagnetic valve (11), opening a vacuum pump (29) until the reading number 3s of a pressure gauge (32) is unchanged, the balance tank and the main pipeline are in vacuum, a cylinder piston (26) falls to the lowest position, closing the sixth electromagnetic valve (6), the fourth electromagnetic valve (4), the eighth electromagnetic valve (8) and the eleventh electromagnetic valve (11), closing the vacuum pump (29), and ending the initialization of the system;
d. Opening a third electromagnetic valve (3), pushing all the gas to be detected into the balance tank, standing for 5 minutes, and selecting an operation flow direction according to the reading of a pressure gauge (32): if the pressure in the balance tank reaches 0.2MPa, executing the steps e-f, j-n; if the pressure is less than 0.001MPa or the standard atmospheric pressure of the gas in the gas cylinder (16) is less than 3 liters, discarding the measurement and executing the process j-n; if the pressure is higher than 0.001MPa and lower than 0.2MPa, starting a cylinder pressurizing device (25) and executing a flow g-n; immediately closing the third electromagnetic valve (3), recording the readings of the pressure gauge (32) and the thermometer (31), and calculating the total volume of the gas in the balance tank; according to the ideal gas state equation:
PV＝nRT(Ⅰ)
The finishing method can obtain:
In the formula (II), P is the gas pressure, V is the gas volume, n is the mol number of the gas, R is a constant, and T is the temperature; it follows that the right formula in this device is a constant value, namely:
The volume V 1 of the device is 300L, and the pressure P 1 and the temperature T 1 can be measured by a pressure gauge (32) and a thermometer (31) respectively;
The right side P 2 of equation (III) is a standard atmospheric pressure, T 2 is room temperature 25 ℃, so that the gas volume V 2 can be obtained;
e. The fourth electromagnetic valve (4) and the twelfth electromagnetic valve (12) are opened, the gas volume in the balance tank is monitored, after 3 liters of gas is discharged, the atmosphere in the pipeline after the twelfth electromagnetic valve (12) is purged, a tested sample is prevented from being polluted, a mass spectrum analyzer (21) is opened for first detection, and the detection result is recorded, wherein the detection result comprises gas components and concentration;
f. Performing multiple detection by a mass spectrometer (21), storing data, performing multiple detection and averaging to obtain a statistical result of gas components and concentrations;
g. Starting a vacuum pump (29), sucking low-pressure or negative-pressure gas in a balance tank, wherein the volume of the balance tank is 300 liters, the volume of a cylinder is 3 liters, and synchronously detecting that if the pressure of the gas in the balance tank is reduced by 3/300 or a cylinder piston (26) approaches the top of the cylinder, closing the fourth electromagnetic valve (4), the ninth electromagnetic valve (9) and the vacuum pump (29), starting an eleventh electromagnetic valve (11) and a blower (24), and opening a twelfth electromagnetic valve (12) after 10 seconds;
h. Purging the atmosphere in the pipeline after the twelfth electromagnetic valve (12) to avoid polluting the tested sample;
i. repeating the step g, starting a mass spectrum analyzer (21), detecting for a plurality of times, storing data, and closing all electromagnetic valves; averaging the stored gas components and concentration results to obtain statistical results;
j. And (3) purging: opening a fifth electromagnetic valve (5), discharging residual gas in the balance tank until the reading is less than 0.105MPa; when the pressure of the residual gas is more than 0.1MPa, executing the operation, and if the pressure of the residual gas is less than 0.1MPa, ignoring the operation; starting a seventh electromagnetic valve (7), starting a blower (24), and running for 5 minutes; closing the fifth electromagnetic valve (5), opening the fourth electromagnetic valve (4), the twelfth electromagnetic valve (12) and the eighth electromagnetic valve (8), continuing to purge for 3 minutes, pushing residual gas in the pipeline into the atmosphere, closing all the electromagnetic valves, and closing the blower (24);
k. opening a second electromagnetic valve (2), discharging the liquid in the pressure balance tank (17) into a liquid storage barrel (39), measuring the mass of the liquid by using an electronic scale (36), and storing the liquid in a system;
Washing: opening a first electromagnetic valve (1), placing 0.1m3 of liquid, closing the first electromagnetic valve (1), standing for at least 5min, opening a tenth electromagnetic valve (10), and discharging the liquid to the outside;
And (m) air drying: opening a fifth electromagnetic valve (5) and a seventh electromagnetic valve (7), opening a blower (24), operating for at least 15 minutes, drying the tank body, prompting that the detection is finished, and obtaining all detection results: gas composition, concentration, liquid mass.
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