阅读说明：本技术 页岩油气现场检测装置 (Shale oil gas on-site detection device ) 是由 裴学良 孙浩玉 吴仲华 刘丹 陈忠帅 马文武 李风叶 司英晖 聂云飞 庄伟� 赵 于 2019-02-20 设计创作，主要内容包括：页岩油气现场检测装置,包括集气筒、压力平衡罐、过滤装置、前过滤装置、质谱分析仪、工控机和打印机；该装置可极大的减少页岩油气采集决策的等待时间,可自动检测气体成分,通过显示设备显示检测结果,具有多种表述方式,无需专业知识也可操作该系统(只需控制开启及关闭按钮),集成了自动化冲洗功能,检测后设备自动冲洗,极大的提高了现场操作的可行性,具有适当的体积,可配置于移动车辆上,适应多种条件下的页岩油气成分检测；可实现气液分离、液相体积和质量测量、气体总量测量、气体组分和浓度的在线测量及设备的自动化冲洗,体积适中,现场的可操作性极强；针对较大范围内气压下的气体均可实现该测量,具有较大的社会意义和实用价值。(The shale oil gas on-site detection device comprises a gas collecting cylinder, a pressure balancing tank, a filtering device, a front filtering device, a mass spectrum analyzer, an industrial personal computer and a printer; the device can greatly reduce the waiting time of shale oil gas acquisition decision-making, can automatically detect gas components, displays the detection result through the display equipment, has various expression modes, can operate the system without professional knowledge (only controls to turn on and turn off a button), integrates an automatic flushing function, automatically flushes equipment after detection, greatly improves the feasibility of field 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, the liquid phase volume and mass measurement, the gas total quantity measurement, the on-line measurement of gas components and concentration and the automatic flushing of equipment can be realized, the volume is moderate, and the field operability is strong; the measurement can be realized aiming at the gas under the air pressure in a larger range, and the method has larger social significance and practical value.)

1. The shale oil gas on-site detection device is characterized by comprising a first pipeline, wherein the first pipeline is sequentially communicated with a gas collecting 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 spectrum analyzer from left to right; the second pipeline is sequentially communicated with the pressure balance tank, the seventh electromagnetic valve, the second three-way pipe, the eleventh electromagnetic valve, the cylinder pressurizing device, the eighth electromagnetic valve and the 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 cavity and a second cavity, the first cavity is communicated with the eleventh electromagnetic valve, and the second cavity is communicated with the eighth electromagnetic valve; the third pipeline is communicated with the pressure balance tank, the sixth electromagnetic valve, the third three-way pipe, the ninth electromagnetic valve and the first cavity from left to right in sequence; the pressure balance tank is also provided with a thermometer and a pressure gauge, the second three-way pipe is also communicated with the air blower, and the third three-way pipe is also communicated with the vacuum pump.

2. The shale oil and gas field detection device of claim 1, wherein the pressure balance tank is further provided with a water injection pipe, a first exhaust pipe and a water outlet pipe, the water outlet pipe is further communicated with a second exhaust pipe, a second electromagnetic valve is arranged at the rear section of the end of the water outlet pipe communicated with the second exhaust pipe, a tenth electromagnetic valve is arranged on the second exhaust pipe, and the water injection pipe is provided with the first electromagnetic valve.

3. The shale oil and gas field detection device of claim 2, wherein saturated NaHCO is filled in the filtering device₃And (3) solution.

4. The shale oil and gas field detection device of claim 2, wherein the end of the water outlet pipe is communicated with a liquid storage barrel.

5. The shale oil and gas field detection device of claim 4, wherein an electronic scale is arranged below the liquid storage barrel.

6. The shale oil and gas field detection device as claimed in any one of claims 1-5, further comprising an industrial personal computer and a printer, wherein the industrial personal computer is in communication connection with the mass spectrometry analyzer, and the printer is in communication connection with the industrial personal computer.

7. The detection method of the shale oil and gas field detection device as claimed in claim 6, characterized by comprising the steps of:

a. starting up 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 the parameters of a pressure gauge of a pressure balance tank, and starting working normally 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, opening a vacuum pump until the reading of the pressure gauge is unchanged for 3s, enabling the balance tank and the main pipeline to be vacuum, enabling the piston of the air cylinder to fall to the lowest part, closing the sixth electromagnetic valve, the fourth electromagnetic valve, the eighth electromagnetic valve and the eleventh electromagnetic valve, and closing the vacuum pump. The system initialization is finished;

d. opening the third solenoid valve, all pushing into the surge tank with the gas that awaits measuring, 5 minutes stew, according to the manometer reading, select the operation flow direction: if the pressure in the balance tank reaches 0.2MPa, executing the steps e-f and j-n; if the pressure is less than 0.001MPa or the standard atmospheric pressure of the gas in the gas collecting cylinder is less than 3 liters, abandoning the measurement and executing a flow j-n; if the pressure intensity is greater than 0.001MPa and less than 0.2MPa, starting the cylinder pressurizing device, and executing the flow g-n; immediately closing the third electromagnetic valve, recording the readings of a pressure gauge and a thermometer 31, and calculating the total volume of the gas in the balance tank; according to an ideal gas state equation:

PV＝nRT (1)

finishing to obtain:

(2) where P is the gas pressure, V is the gas volume, n is the number of moles of gas, R is a constant, and T is the temperature.

It can be seen that in this device, the right formula is constant, namely:

and the volume V of the device₁Is 300L, pressure P₁And temperature T₁Can be measured by a pressure meter and a thermometer respectively;

right side P of equation (3)₂Is a standard atmospheric pressure, T₂At room temperature 25 ℃. Thus, the gas volume V can be determined₂。

e. Open fourth solenoid valve, twelfth solenoid valve, the gas volume in the monitoring balance jar, after 3 liters of gas are fallen in the emission, blow the atmosphere in the pipeline behind solenoid valve 12, avoid polluting the sample that is surveyed, open mass spectrum analyzer 37 and detect for the first time, record testing result, testing result includes gaseous component and concentration.

f. And (4) carrying out multiple detections by the mass spectrometer 37, storing data, and carrying out multiple detections and averaging to obtain a statistical result of the gas components and the gas concentration.

g. Opening a fourth electromagnetic valve, an eighth electromagnetic valve and a ninth electromagnetic valve, starting a vacuum pump, sucking low-pressure or negative-pressure gas in the balance tank, wherein the volume of the balance tank is 300 liters, the volume of the cylinder is 3 liters, synchronously detecting that the pressure of the gas in the balance tank is reduced by 3/300 or the piston of the cylinder is close to the top of the cylinder, closing the fourth electromagnetic valve, the ninth electromagnetic valve and the vacuum pump, opening an eleventh electromagnetic valve and a blower, and opening a twelfth electromagnetic valve after 10 seconds.

h. And the atmosphere in the pipeline after the twelfth electromagnetic valve is purged, so that the measured sample is prevented from being polluted.

i. And g, repeating the step g, starting the mass spectrum analyzer 37, carrying out multiple detections, storing data, and closing all the electromagnetic valves. And averaging the stored gas components and concentration results to obtain a statistical result.

j. Purging: opening the fifth electromagnetic valve, discharging the residual gas in the balancing tank, executing the operation until the reading is less than 0.105MPa, and when the pressure of the residual gas is greater than 0.1MPa, and neglecting the operation if the reading is less than the value; opening a seventh electromagnetic valve, opening the blower and running for 5 minutes; and closing the fifth electromagnetic valve 5, opening the fourth electromagnetic valve, the twelfth electromagnetic valve and the eighth electromagnetic valve, continuously purging for 3 minutes, pushing residual gas in the pipeline into the atmosphere, closing all the electromagnetic valves and closing the blower.

k. And 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.

l, washing: opening the first electromagnetic valve, and putting in 0.1m³And (3) liquid, closing the first electromagnetic valve, standing for at least 5min, opening the tenth electromagnetic valve, and discharging the liquid to the outdoor.

m, air drying: opening fifth solenoid valve, seventh solenoid valve, opening the air-blower, the operation is 15 minutes at least, weathers the jar body, and the suggestion detects and finishes, obtains whole testing results: gas composition, concentration, liquid quality.

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 methods for testing the gas content of shale include a desorption method, an isothermal adsorption method, a logging and desorption method and the like. The desorption method is a direct method for measuring the gas content of the shale, is also the most common method, can reflect the gas content characteristics of the shale under the condition of simulating the actual environment of a stratum, and is used as a basic method for measuring the gas content of the shale, but the method is long in time consumption and large in error; the isothermal adsorption method and the well logging and interpretation method are indirect methods for measuring the gas content of the shale. Isothermal adsorption is the reverse process of desorption, and through isothermal adsorption simulation, the adsorption characteristics and the capacity of the shale rich in organic substances can be researched to obtain the parameter data of the content of the adsorbed gas, but for shale gas with small adsorption quantity, the isothermal adsorption method is not suitable and has large errors; the well logging interpretation method is a method for acquiring shale gas content through well logging information interpretation, firstly, a rock-electricity relationship is established, wherein the rock-electricity relationship comprises the relationship between rock density and organic matter content, the relationship between radioactive substance content and organic matter content, the relationship between organic matter content and gas content and the like, and then, the adsorbed gas content, free gas content and total gas content are explained through well logging information, but the rock-electricity relationship of the shale gas in China is not effectively established at present.

Disclosure of Invention

To shale oil gas check out test set and the not enough in the detection method, this patent aim at provide one kind can realize that gas-liquid separation, liquid volume and mass measurement, gas total amount measure, the online measurement of gas component and concentration and the automation of equipment are washed to the volume is moderate, the very strong shale oil gas on-the-spot detection device of on-the-spot maneuverability, its technical scheme as follows:

the shale oil gas on-site detection device comprises a first pipeline, wherein the first pipeline is sequentially communicated with a gas collecting 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 spectrum analyzer from left to right; the second pipeline is sequentially communicated with the pressure balance tank, the seventh electromagnetic valve, the second three-way pipe, the eleventh electromagnetic valve, the cylinder pressurizing device, the eighth electromagnetic valve and the 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 cavity and a second cavity, the first cavity is communicated with the eleventh electromagnetic valve, and the second cavity is communicated with the eighth electromagnetic valve; the third pipeline is communicated with the pressure balance tank, the sixth electromagnetic valve, the third three-way pipe, the ninth electromagnetic valve and the first cavity from left to right in sequence; the pressure balance tank is also provided with a thermometer and a pressure gauge, the second three-way pipe is also communicated with the air blower, and the third three-way pipe is also communicated with the 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 rear section of outlet pipe and second blast pipe intercommunication end is equipped with the second solenoid valve, be equipped with the tenth solenoid valve on the second blast pipe, be equipped with first solenoid valve on the water injection pipe.

Furthermore, saturated NaHCO is filled in the filtering device₃And (3) solution.

Furthermore, the tail end of the water outlet pipe is communicated with the liquid storage barrel.

Furthermore, an electronic scale is arranged below the liquid storage barrel.

Further, still include industrial computer and printer, the industrial computer is connected with mass spectrum analysis appearance communication, and the printer is connected with the industrial computer communication.

The detection method of the shale oil and gas on-site detection device comprises the following steps:

a. starting up 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 the parameters of a pressure gauge of a pressure balance tank, and starting working normally 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, opening a vacuum pump until the reading of the pressure gauge is unchanged for 3s, enabling the balance tank and the main pipeline to be vacuum, enabling the piston of the air cylinder to fall to the lowest part, closing the sixth electromagnetic valve, the fourth electromagnetic valve, the eighth electromagnetic valve and the eleventh electromagnetic valve, and closing the vacuum pump. The system initialization is finished;

d. opening the third solenoid valve, all pushing into the surge tank with the gas that awaits measuring, 5 minutes stew, according to the manometer reading, select the operation flow direction: if the pressure in the balance tank reaches 0.2MPa, executing the steps e-f and j-n; if the pressure is less than 0.001MPa or the standard atmospheric pressure of the gas in the gas collecting cylinder is less than 3 liters, abandoning the measurement and executing a flow j-n; if the pressure intensity is greater than 0.001MPa and less than 0.2MPa, starting the cylinder pressurizing device, and executing the flow g-n; immediately closing the third electromagnetic valve, recording the readings of a pressure gauge and a thermometer 31, and calculating the total volume of the gas in the balance tank; according to an ideal gas state equation:

PV＝nRT (1)

finishing to obtain:

(2) where P is the gas pressure, V is the gas volume, n is the number of moles of gas, R is a constant, and T is the temperature.

It can be seen that in this device, the right formula is constant, namely:

and the volume V of the device₁Is 300L, pressure P₁And temperature T₁Can be measured by a pressure meter and a thermometer respectively; right side P of equation (3)₂Is a standard atmospheric pressure, T₂At room temperature 25 ℃. Thus, the gas volume V can be determined₂；

e. Opening a fourth electromagnetic valve and a twelfth electromagnetic valve, monitoring the volume of gas in the balance tank, purging the atmosphere in the pipeline behind the electromagnetic valve 12 after 3 liters of gas is discharged to avoid polluting the sample to be detected, opening the mass spectrometer 37 for the first detection, and recording the detection result, wherein the detection result comprises gas components and concentration;

f. carrying out multiple detections by the mass spectrometer 37, storing data, and carrying out multiple detections and averaging to obtain statistical results of gas components and concentration;

g. opening a fourth electromagnetic valve, an eighth electromagnetic valve and a ninth electromagnetic valve, 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, synchronously detecting that the pressure of the gas in the balance tank is reduced by 3/300 or a piston of the cylinder is close to the top of the cylinder, closing the fourth electromagnetic valve, the ninth electromagnetic valve and the vacuum pump, opening an eleventh electromagnetic valve and a blower, and opening a twelfth electromagnetic valve after 10 seconds;

h. the atmosphere in the pipeline after the twelfth electromagnetic valve is purged, so that the measured sample is prevented from being polluted;

i. and g, repeating the step g, starting the mass spectrum analyzer 37, carrying out multiple detections, storing data, and closing all the electromagnetic valves. Averaging the stored gas components and concentration results to obtain a statistical result;

j. purging: opening the fifth electromagnetic valve, discharging the residual gas in the balancing tank, executing the operation until the reading is less than 0.105MPa, and when the pressure of the residual gas is greater than 0.1MPa, and neglecting the operation if the reading is less than the value; opening a seventh electromagnetic valve, opening the 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, continuously purging 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;

l, washing: opening the first electromagnetic valve, and putting in 0.1m³Liquid, the first electromagnetic valve is closed, standing is carried out for at least 5min, the tenth electromagnetic valve is opened, and the liquid is discharged to the outside;

m, air drying: opening fifth solenoid valve, seventh solenoid valve, opening the air-blower, the operation is 15 minutes at least, weathers the jar body, and the suggestion detects and finishes, obtains whole testing results: gas composition, concentration, liquid quality.

The beneficial effect of this patent is:

the device can greatly reduce the waiting time of shale oil gas acquisition decision-making, and the device has realized high automation, but automated inspection gas composition shows the testing result through showing the controlling part, has multiple expression mode (optional), also can operate this system (only need control to open and close the button) without professional knowledge. The device has still integrated automatic function of washing, can realize that the equipment is automatic to be washed after the detection, very big improvement field operation's feasibility. The device has a proper volume, can be arranged on a moving vehicle, and can adapt to shale oil gas component detection under various conditions; the device can realize 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, and has moderate volume and strong field operability; the measurement can be realized aiming at the gas under the air pressure in a larger range, and the method has larger social significance and practical value.

Drawings

FIG. 1 is an overall structure diagram of a shale oil and gas field detection device;

FIG. 2 is a flow chart of a detection method of the shale oil and gas field detection device;

in the figure: 1. a first electromagnetic valve, 2, a second electromagnetic valve, 3, a third electromagnetic valve, 4, a fourth electromagnetic valve, 5, a fifth electromagnetic valve, 6, a sixth electromagnetic valve, 7, a seventh electromagnetic valve, 8, an eighth electromagnetic valve, 9, a ninth electromagnetic valve, 10, a tenth electromagnetic valve, 11, an eleventh electromagnetic valve, 12, a twelfth electromagnetic valve, 13, a first pipeline, 14, a second pipeline, 15, a third pipeline, 16, a gas collecting cylinder, 17, a pressure balancing tank, 18, a first three-way pipe, 19, a filtering device, 20, a pre-filtering device, 21, a mass spectrum analyzer, 22, a printer, 23, an industrial personal computer, 24, a blower, 25, a cylinder pressurizing device, 26, a piston, 27, a first chamber, 28, a second chamber, 29, a vacuum pump, 30, a water injection pipe, 31, a thermometer, 32, a pressure gauge, 33, a first exhaust pipe, 34, a second exhaust pipe, 35, a water outlet pipe, 36, a fifth electromagnetic valve, 6, a, Electronic scale, 37, channel, 38, standard gas tank, 39 and liquid storage barrel.

Detailed Description

The following is one of the preferred embodiments of this patent:

referring to fig. 1, the shale oil and gas field detection device comprises a gas collecting 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 spectrum analyzer 21 and an industrial control computer (hereinafter referred to as an industrial personal computer 23), wherein pressure parameters are used as main control parameters, and the pressure is gradually reduced.

The first pipeline 13 and the first pipeline 13 are sequentially communicated with a gas collecting cylinder 16, a third electromagnetic valve 3, a pressure balancing tank 17, a fourth electromagnetic valve 4, a first three-way pipe 18, a twelfth electromagnetic valve 12, a filtering device 19, a front filtering device 20 and a mass spectrum analyzer 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 cylinder is divided into a first chamber 27 and a second chamber 28 by the piston 26, 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 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 in sequence.

The pressure balancing tank 17 is further provided with a thermometer 31 and a pressure gauge 32, the second three-way pipe is further communicated with an air blower 24, the third three-way pipe is further communicated with a vacuum pump 29, the pressure balancing 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 communicated 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, an industrial personal computer 23 is in communication connection with a mass spectrometer 21, a 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, the, the inside is filled with standard gas.

The gas collecting cylinder 16: shale formation hydrocarbons are collected and used as a measurement object to force the gas into the pressure equalization tank 17.

Pressure balance tank 17: the device has the effects of stabilizing and uniformly mixing the gas, and preventing the influence of the gas stratification phenomenon on the detection precision.

The pre-filter device 20: the dust and the liquid in the gas are filtered for the second time, so that the liquid phase and gas phase detection precision 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.

The filtering device 19: by saturated NaHCO₃The solution filters out some acid gases in the shale oil and gas that may corrode subsequent equipment.

The mass spectrum analyzer 21: the function of gas component detection is realized, the components of the input gas 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 oil field management software, connecting with an oil field automation system, realizing logic control of the whole system, and uniformly expressing the result in display equipment (such as a display, a display screen and the like).

Referring to the attached fig. 1 and 2, the equipment flushing process and the detection process of the shale oil and gas on-site detection device are as follows:

n, starting the system, and inputting a user name and a password according to the display of a software login interface; after the input is correct, system initialization is started.

Initializing content includes: all the solenoid valves are closed and the pressure gauge 32 parameter of the pressure equalizing tank 17, which may be equal to about 1 atmosphere, is read, and the operation is started normally.

p. opening the sixth solenoid valve 6, the fourth solenoid valve 4, the eighth solenoid valve 8 and the eleventh solenoid valve 11, opening the vacuum pump 29 until the reading of the pressure gauge 32 is unchanged for 3s (the balance tank and the main pipeline are vacuum, and the cylinder piston 26 falls to the lowest part), closing the sixth solenoid valve 6, the fourth solenoid valve 4, the eighth solenoid valve 8 and the eleventh solenoid valve 11, and closing the vacuum pump 29. The system initialization is ended.

q. open third solenoid valve 3 (the pressure valve between pressure balance tank 17 and gas cylinder 16), all push into the balance tank with the gas that awaits measuring, stand 5 minutes (let the gas of dissolving in liquid slowly-release come out), according to the manometer 32 reading, select the operation flow direction: (1) when the pressure in the balance tank reaches 0.2MPa, executing the processes e-f and j-n; (2) when the pressure is less than 0.001MPa (namely the gas in the gas collecting cylinder 16 is less than 3 liters, and the pressure is in the standard atmospheric pressure), the measurement is abandoned, and a flow j-n is executed; (3) and if the pressure intensity is greater than 0.001MPa and less than 0.2MPa, starting the air cylinder (pressurizing device) and executing the flow g-n. Immediately closing the third electromagnetic valve 3, recording the reading of the pressure gauge 32 and the temperature gauge 31, and calculating the total volume of the gas in the balance tank. According to an ideal gas state equation:

PV＝nRT (1)

finishing to obtain:

(2) where P is the gas pressure, V is the gas volume, n is the number of moles of gas, R is a constant, and T is the temperature.

It can be seen that in this device, the right formula is constant, namely:

and the volume V of the device₁Is 300L, pressure P₁And temperature T₁Can be measured by a pressure gauge 32 and a thermometer 31 respectively; right side P of equation (3)₂Is a standard atmospheric pressure, T₂At room temperature 25 ℃. Thus, the gas volume V can be determined₂。

And r, opening the fourth electromagnetic valve 4 and the twelfth electromagnetic valve 12, monitoring the volume of gas in the balance tank (by pressure and temperature real-time calculation), after discharging 3 liters of gas (purging the atmosphere in the pipeline after the twelfth electromagnetic valve 12 to avoid polluting the sample to be detected), opening the mass spectrometer 37 for first detection, and recording the detection result (gas component and concentration).

s. multiple measurements are taken by mass spectrometer 37, the data are saved and averaged over multiple times to give statistics on gas composition and concentration.

t, opening the fourth solenoid valve 4, the eighth solenoid valve 8 and the ninth solenoid valve 9, starting the vacuum pump 29, pumping low-pressure or negative-pressure gas in the pressure balance tank 17, synchronously detecting that the pressure of the gas in the pressure balance tank 17 is 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), closing the fourth solenoid valve 4, the ninth solenoid valve 9 and the vacuum pump 29, opening the eleventh solenoid valve 11 and the blower 24, and opening the twelfth solenoid valve 12 after 10 seconds.

And u, blowing the atmosphere in the pipeline after the twelfth electromagnetic valve 12 to avoid polluting the sample to be measured.

v, repeating the step g, starting the mass spectrum analyzer 37, carrying out multiple detections, storing data, and closing all electromagnetic valves; the stored gas composition and concentration results are averaged to give statistical results.

w. purging: the fifth solenoid valve 5 is opened and the residual gas in the balancing 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 less than this, the present operation is ignored). The seventh solenoid valve 7 is opened and the blower 24 is turned on for 5 minutes (this parameter is re-selectable). And closing the fifth electromagnetic valve 5, opening the fourth electromagnetic valve 4, the twelfth electromagnetic valve 12 and the eighth electromagnetic valve 8, continuing purging for 3 minutes, and pushing residual gas in the pipeline into the atmosphere. All solenoid valves are closed and the blower 24 is turned off.

x. open the second solenoid valve 2, discharge the liquid in the pressure balance tank 17 into the liquid storage barrel 39, and use the electronic scale 36 to measure the mass (mass of liquid) and store in the industrial personal computer system.

y. washing: opening the first electromagnetic valve 1 (the water injection pipe 30 is connected with the external tap water pipe), and putting 0.1m³And (3) liquid (or timing), closing the first electromagnetic valve 1, standing for 5min (time is self-determined), opening the tenth electromagnetic valve 10, and discharging the liquid to the outdoor.

z. air drying: and opening the fifth electromagnetic valve 5 and the seventh electromagnetic valve 7, opening the blower 24, running for 15 minutes (the parameters can be selected again), and drying the tank body of the pressure balance tank 17.

and aa, prompting that the detection is finished, and outputting all detection results (gas components, concentration and liquid quality).

The final aim 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 the display control, the shale oil gas field detection device has multiple expression modes (optional), and the system can be operated without professional knowledge (only the opening and closing of a button is controlled); the feasibility of field operation is greatly improved, and the device has a proper volume, can be configured on a mobile vehicle, and can be suitable for shale oil gas component detection under various conditions; and is applicable to a wide range of pressure change conditions by the method.