CN107144625B - Gas hydrates drill core light hydrocarbon gas content parsing test system and method - Google Patents
Gas hydrates drill core light hydrocarbon gas content parsing test system and method Download PDFInfo
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- CN107144625B CN107144625B CN201710491399.1A CN201710491399A CN107144625B CN 107144625 B CN107144625 B CN 107144625B CN 201710491399 A CN201710491399 A CN 201710491399A CN 107144625 B CN107144625 B CN 107144625B
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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
- G01N27/626—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 using heat to ionise a gas
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
Abstract
The invention discloses a kind of gas hydrates drill core light hydrocarbon gas content to parse test system and method.Parsing test system includes temperature control chamber, temperature control intracavitary is equipped with weight calculation component, sealed decomposition chamber is placed on weight calculation component, the air inlet of decomposition chamber, air inlet check valve is separately installed with gas outlet, gas outlet air circuit breaker, pressure gauge is also equipped with decomposition chamber, safety valve, air-source is connected by the first Quick-acting gas connector with air inlet check valve, gas outlet air circuit breaker is connected by the air inlet of the second Quick-acting gas connector and collection chamber, the gas outlet of collection chamber, air-source, hydrogen source air inlet connection corresponding to flame ionization ditector respectively, air hatch is additionally provided with collection chamber.The accurate measurement of light hydrocarbon gas content during the present invention is realized to gas hydrates reservoir drill core by way of low temperature controls decomposition of hydrate, flame ionization ditector directly to measure parsing light hydrocarbon gas volume, overcome because decomposition temperature is low, speed is fast, release gas volume greatly caused by technical difficulty and security risk, it is safe and practical.
Description
Technical field
It is the present invention relates to a kind of gas hydrates drill core light hydrocarbon gas content parsing test system and real based on the system
Existing gas hydrates drill core light hydrocarbon gas content parsing test method, belongs to oil exploration and exploitation gas hydrates brill
Core methane parses and assay technical field.
Background technology
Gas hydrates are commonly called as " combustible ice ", are the petroleum resourceses of reserves maximum on the earth, how effectively and safely right
It is current the problem of needing to research and solve in a hurry that it, which is explored, developed and utilized,.
The combustible component of gas hydrates is substantially methane, also has a small amount of other light hydrocarbon gases.Therefore, it is accurate to survey
Determine the content of methane and its distribution in gas hydrates reservoir be carry out natural gas hydrate exploration, develop and utilize it is strong
Technical need.At present, boring and coring is carried out to gas hydrates reservoir, is to obtain reservoir by carrying out analysis test to drill core
The realistic approach of methane content.
Up to now, the method for measuring methane content in gas hydrates reservoir drill core mainly has two kinds：First, pass through
Raman spectrum obtains gas hydrates methane cage occupation rate in drill core, and hydrate index is calculated, this is a kind of indirect
The method for obtaining methane abundance, there are large error for measurement result.Second, by measuring the brill before and after gas hydrate dissociation
Core weight difference calculates its air content, this belongs to direct measuring method, this measurement method is excessively rough, and error is larger, and deposits
In security risk.
From the foregoing, it will be observed that being decomposed to gas hydrates being controlled property of reservoir drill core gas, directly measure is decomposited
Methane content, undoubtedly obtains the best mode of drill core methane content data, still, there is presently no available for the special of this test
Industry instrument and correlation technique.
There are following several gassiness measurements at present generally using solution analyzer in gassiness measurement in solid-state geological sample
Instrument：Shale gas site desorption Fufen analyzer (discloses text referring to the Chinese invention patent application of Publication No. CN104655522A
Offer), visualized gassiness tester (referring to the Chinese utility model patent document of Publication No. CN202362222U), contain
Tolerance measures and gas collecting device (referring to the Chinese invention patent document of Publication No. CN103245588A), gassiness measurement
Device (referring to the Chinese invention patent document of Publication No. CN103308634A), etc..Although the call of these instruments is each not
It is identical, but test philosophy is identical, i.e., carries out gas parsing under controlled conditions, measure the gas volume parsed, and
Their device composition is similar, all includes parsing two basic structural units of tank and Gas measurement component.But these instruments are big
Customized for shale gas and coal bed gas boring and coring mostly, be not particularly suited for low to gas decomposition temperature, speed is fast,
The air content for discharging bulky gas hydrates drilling core measures.
The content of the invention
It is an object of the invention to provide a kind of gas hydrates drill core light hydrocarbon gas content parsing test system and base
Test method is parsed in the light hydrocarbon gas content that light hydrocarbon gas content parsing test system is realized, it is for gas hydrates
Peculiar property, uses for reference the experience of existing shale gas drilling core gassiness weight testing method, strengthens sealing, the resistance to compression to decomposition chamber
Safety guarantee, adds drill core sample weight calculation function and decomposition temperature low temperature temperature controlling function, adds and realized by gravitational equilibrium
The collection chamber of gas pressure pooling feature, overcomes because gas hydrate dissociation temperature is low, speed is fast, release gas volume is big
Caused technical difficulty and security risk, safe and practical, detection sensitivity is high, high certainty of measurement, safety easy to operate, solves
Natural gas hydrate exploration, develop and utilize for methane content in Accurate Determining gas hydrates reservoir and its distribution
Strong technical needs of problems.
To achieve these goals, present invention employs following technical scheme：
A kind of gas hydrates drill core light hydrocarbon gas content parses test system, it is characterised in that：It includes temperature control chamber,
Temperature control intracavitary is equipped with weight calculation component, counts weight and places sealed decomposition chamber on component, pacifies respectively on the air inlet of decomposition chamber, gas outlet
Equipped with air inlet check valve, gas outlet air circuit breaker, pressure gauge, safety valve are also equipped with decomposition chamber, air-source passes through first
Quick-acting gas connector is connected with air inlet check valve, gas outlet air circuit breaker by the second Quick-acting gas connector and collection chamber into
Gas port connects, and air inlet corresponding to flame ionization ditector connects respectively for the gas outlet of collection chamber, air-source, hydrogen source
Connect, air hatch is additionally provided with collection chamber.
First air flow control valve is installed in the gas circuit between the air inlet of the air-source and the decomposition chamber；
The second air stream is installed in gas circuit between air-source air inlet corresponding to the flame ionization ditector
Control valve；Hydrogen is installed in gas circuit between hydrogen source air inlet corresponding to the flame ionization ditector
Flow control valves；Gas between the air inlet corresponding to the flame ionization ditector of the gas outlet of the collection chamber
Decomposition gas flow control valve is installed on road.
A kind of gas water realized based on the gas hydrates drill core light hydrocarbon gas content parsing test system
Compound drill core light hydrocarbon gas content parses test method, it is characterised in that it includes step：
1) the first air flow control valve, the decomposition gas flow control valve are closed, opens second air
Flow control valve, the hydrogen flowing quantity control valve, are monitored and control to gas coming through flow in gas circuit；
2) igniting starts the flame ionization ditector, reaches steady-working state；
3) the air inlet check valve, the gas outlet air circuit breaker is allowed to be closed；
4) decomposition chamber is placed on the weight calculation component of the temperature control intracavitary, measures its empty mass；
5) decomposition chamber is opened, fastens, makes immediately after gas hydrates drill core is quickly placed into the decomposition chamber
The decomposition chamber is in sealing state；
6) quality during decomposition chamber load sample is measured by the weight calculation component；
7) decomposition chamber by the second Quick-acting gas connector, the first Quick-acting gas connector respectively with the collection
Gas chamber, the first air flow control valve connect；
8) low temperature control is carried out to temperature residing for the decomposition chamber by the temperature control chamber, to avoid day in the decomposition chamber
The decomposition rate of right gas hydrate drill core is too fast；
9) the air inlet check valve, the gas outlet air circuit breaker are opened, and opens the first air mass flow control
Valve processed and the decomposition gas flow control valve, are monitored and control to gas coming through flow in gas circuit；
10) what is produced in the decomposition chamber after the parsing of gas hydrates drill core decomposes storage of the gas by the collection chamber
It is detected after collection and cushioning effect into the flame ionization ditector；
11) the detection data of the flame ionization ditector are gathered, until gas hydrates drill core is decomposed completely；
12) obtained detection data are handled, light hydrocarbon gas in unit mass gas hydrates drill core are calculated
Content.
It is an advantage of the invention that：
What the 1st, the present invention took the light hydrocarbon gas content of gas hydrates reservoir drill core is direct measurement method, this
Direct measurement method the data obtained is the direct reflection of gas hydrates reservoir light hydrocarbon gas content, and authenticity is high, reliability
It is high.
2nd, the present invention takes cryogenic conditions to control gas hydrate dissociation speed so that test process is safe, controllable.
3rd, the present invention detects making choice property of the light hydrocarbon gas such as methane using flame ionization ditector, testing result
From air intrusion effect, the loading of drill core sample is easy to operate, quick, effectively reduces drill core sample and occurs in loading procedure
The problem of scattering and disappearing, and detection sensitivity and precision are high.
4th, the present invention to the flame ionization ditector in gas hydrates drill core decomposable process by detecting data
Gathered in real time, the unit volume methane signal area value based on flame ionization ditector, you can pass through processing detection
Data obtain light hydrocarbon gas content in gas hydrates drill core, and calculation is simple.On the other hand, obtained unit mass
Light hydrocarbon gas burst size of the gas hydrates drill core within the unit interval changes over time data and has also reflected drill core sample
The dynamic law of gas resolving, can provide guidance for the engineering design of related gas hydrates reservoir exploitation with implementing
Property reference data.
5th, present invention enhances the safety precautions to decomposition chamber, there is provided built-in electronic weight calculation function and low temperature temperature control
Function, devises the collection chamber that gas pressure buffering is realized by gravitational equilibrium, overcomes because of gas hydrate dissociation temperature
Low, speed is fast, release gas volume technical difficulty caused greatly and security risk, and air inlet list is provided with air inlet
To valve, gas remnants are decomposed to remove so that test operation is convenient, safety, and test data is complete, reliable for introducing air.
6th, collection chamber of the invention is designed using sealed gravity piston, not only has the function that to preserve gas, but also play
Alleviate the effect for decomposing the impact of gas excess pressure, ensured that flame ionization ditector can continuous firing with security and stability.
7th, the present invention devises air hatch, it is not only used for calibration system, also for analysis drill core decompose gas composition,
Collection drill core decomposition gaseous sample, which provides, easily samples approach.
Brief description of the drawings
Fig. 1 is that gas hydrates drill core light hydrocarbon gas content parsing test system of the present invention forms schematic diagram.
Fig. 2 is the light hydrocarbon gas decomposition rate curve map of artificial synthesized gas hydrates sample.
Fig. 3 is that the light hydrocarbon gas of artificial synthesized gas hydrates sample decompose progress curve figure.
Embodiment
Such as Fig. 1, gas hydrates drill core light hydrocarbon gas content parsing test system of the present invention includes temperature control chamber 3, temperature control
Weight calculation component 2 is equipped with chamber 3, counts weight and sealed decomposition chamber 1 is placed on component 2, on the air inlet of decomposition chamber 1, gas outlet respectively
Air inlet check valve 8, gas outlet air circuit breaker 9 are installed, pressure gauge 6, safety valve 7 are also equipped with decomposition chamber 1, air-source leads to
Cross the first Quick-acting gas connector 11 to be connected with air inlet check valve 8, gas outlet air circuit breaker 9 passes through the second Quick-acting gas connector 10
Be connected with the air inlet of collection chamber 4, the gas outlet of collection chamber 4, air-source, hydrogen source respectively with flame ionization ditector 5
The connection of corresponding air inlet, be additionally provided with air hatch 16 on collection chamber 4.
In the present invention, gas hydrates drill core carries out gas parsing in decomposition chamber 1, its controlled temperature temperature chamber 3 is controlled
System.Decomposition chamber 1 has resistance to compression, Seal Design.Weight calculation component 2 is used to measure gas hydrates drill core quality.Collection chamber 4 plays
Preserved to decomposing gas and buffer the effect of its excess pressure, thus ensure flame ionization ditector 5 continue safety,
Stably work, while implementation condition is provided for the gaseous sample that collection drill core is decomposed.Flame ionization ditector 5 be used for pair
Decompose gas examinations.
Such as Fig. 1, in actual design, it is empty that first is provided with the gas circuit between the air inlet of air-source and decomposition chamber 1
Flow control valves 12, are provided with the gas circuit between air-source air inlet corresponding to flame ionization ditector 5
Two air flow control valves 13, are installed in the gas circuit between hydrogen source air inlet corresponding to flame ionization ditector 5
There is hydrogen flowing quantity control valve 14, the gas between the air inlet corresponding to flame ionization ditector 5 of the gas outlet of collection chamber 4
It is provided with road and decomposes gas flow control valve 15.
Such as Fig. 1, collection chamber 4 includes the air collecting chamber 42 of open top, and the open-mouth of air collecting chamber 42 is hermetically movably installed with
Gravity type piston 41, gravity type piston 41 can move up and down with the change of circulated gases amount in air collecting chamber 42, be decomposed with buffering
The excess pressure that gas produces is decomposed in room 1.
In actual design, decomposition chamber 1 is the sealed decomposition chamber that can quickly open with fastening, and such structure design is just
In the loading of Rapid Implementation drill core sample, effectively reduce gas hydrates gas and scatter and disappear.
In addition, the air inlet check valve 8 of decomposition chamber 1, the function of gas outlet air circuit breaker 9 are can to prevent hydrate point
Gas leakage is solved, and cleaning of the foreign gas realization to gas hydrate dissociation residual air can be introduced.
In the present invention, temperature control chamber 3, weight calculation component 2, pressure gauge 6, air inlet check valve 8, gas outlet air circuit breaker 9, hydrogen
Flame ionization detector 5, the first air flow control valve 12, the second air flow control valve 13, hydrogen flowing quantity control valve 14,
Decompose the grade of gas flow control valve 15 to be connected with control processor, control processor is used to send control instruction, receives testing number
According to this and carry out Correlation method for data processing etc..
Test system is parsed based on the invention described above gas hydrates drill core light hydrocarbon gas content, the invention also provides
A kind of gas hydrates drill core light hydrocarbon gas content parses test method, it includes step：
1) close the first air flow control valve 12, decompose gas flow control valve 15, open the second air flow control
Valve 13, hydrogen flowing quantity control valve 14, are monitored and control to gas flow in gas circuit；
2) igniting starts flame ionization ditector 5, reaches steady-working state；
3) air inlet check valve 8, gas outlet air circuit breaker 9 is allowed to be closed；
4) decomposition chamber 1 is placed on the weight calculation component 2 in temperature control chamber 3, measures its empty mass；
5) decomposition chamber 1 is opened, is fastened immediately after gas hydrates drill core is quickly placed into decomposition chamber 1, makes decomposition chamber 1
In sealing state；
6) quality when measuring 1 load sample of decomposition chamber by counting weight component 2；
7) decomposition chamber 1 by the second Quick-acting gas connector 10, the first Quick-acting gas connector 11 respectively with collection chamber 4, first
Air flow control valve 12 connects；
8) low temperature control is carried out to temperature residing for decomposition chamber 1 by temperature control chamber 3, is hydrated to avoid natural gas in decomposition chamber 1
The decomposition rate of thing drill core is too fast；
9) air inlet check valve 8, gas outlet air circuit breaker 9 are opened, and opens the first air flow control valve 12, decompose
Gas flow control valve 15, is monitored and controls to gas flow in gas circuit；
10) the decomposition gas produced in decomposition chamber 1 after the parsing of gas hydrates drill core is gentle by preserving for collection chamber 4
It is detected after punching effect into flame ionization ditector 5；
11) the detection data of flame ionization ditector 5 are gathered, until gas hydrates drill core is decomposed completely；
12) obtained detection data are handled, light hydrocarbon gas in unit mass gas hydrates drill core are calculated
Content.
In actual implementation, the temperature of temperature control chamber 3 controls between 1 DEG C to 15 DEG C, and the first air flow control valve 12 is controlled
In 10mL/min between 12mL/min, the second air flow control valve 13 control air velocity exists the upper limit of air velocity processed
360mL/min between 365mL/min, hydrogen flowing quantity control valve 14 control hydrogen flow rate 38mL/min to 40mL/min it
Between, the upper limit for the decomposition gas flow rate that gas flow control valve 15 controls collection chamber 4 to send out is decomposed within 25mL/min, hydrogen fire
The operating temperature of flame ionization detector 5 controls between 190 DEG C to 250 DEG C.
Performing step 8~11) during, gather gas hydrates drill core point from the air hatch 16 on collection chamber 4
Gaseous sample is solved, to carry out gas chromatographic analysis or for preserving.
In actual implementation, step 12) further comprises：
Based on passing through Standard Gas of Methane flame ionization ditector unit volume methane signal area obtained by calibrating
The time integral value of signal (detection), to the gas hydrate dissociation product that is collected by flame ionization ditector 5
Detect data carry out Integral Processing, and by count weight component 2 obtain gas hydrates drill core quality (drill core quality=point
Solve quality-decomposition chamber empty mass during the load sample of room), calculate and draw out light hydrocarbon gas decomposition rate curve (unit interval, list
The gas hydrates drill core of position quality decomposes light hydrocarbon gas volume (mL/kg/min) and resolving time point (min) in gas
Relation curve, such as Fig. 2), and light hydrocarbon gas decompose progress curve (unit mass gas hydrates drill core accumulation decompose
Light hydrocarbon gas volume (mL/kg) and the relation curve of accumulative resolving time (min), such as Fig. 3) so that, decompose in progress curve most
The value at moment is the light hydrocarbon gas content in unit mass gas hydrates drill core afterwards.
Further, based on the light hydrocarbon gas content in the unit mass gas hydrates drill core calculated, with reference to from taking
Gas port 16 gathers sample and carries out the gas composition data that gas chromatographic analysis obtains, and calculates unit mass gas hydrates brill
The content for decomposing each component such as methane in gas of core.
In practice, system calibrating step is further included before step 1) is performed, is specifically included：
1) decomposition chamber 1 is fastened, decomposition chamber 1 is placed in temperature control chamber 3；
2) decomposition chamber 1 and collection chamber 4, air-source are connected；
3) the first air flow control valve 12, the second air flow control valve 13, hydrogen flowing quantity control valve 14, air inlet are opened
Mouth check valve 8, gas outlet air circuit breaker 9 and decomposition gas flow control valve 15, are monitored and control to gas flow in gas circuit
System, wherein, the air velocity for usually controlling the first air flow control valve 12 is 10mL/min, and controls the second air mass flow control
The flow velocity of valve 13 and hydrogen flowing quantity control valve 14 processed and the operating temperature of flame ionization ditector 5 come ensure hydrogen flame from
5 steady operation of sonization detector；
4) igniting starts flame ionization ditector 5, reaches steady-working state；
5) after system stabilization, the Standard Gas of Methane accurately measured is injected from air hatch 16, is examined by hydrogen flameionization
The detection of device 5 and acquisition testing data are surveyed, until whole methane are detected；
6) processing detection data, by asking for the integrated value of CH_4 detection signal strength and detection time, calculate and are being
The unit volume methane signal area (time integral value of detection signal) of flame ionization ditector 5, is completed under system environment
System calibrating.
Embodiment：
(1) sample：Artificial synthesized gas hydrates sample.
(2) instrument operating condition：3 DEG C of the temperature of temperature control chamber 3,12 current limliting 10mL/min of the first air flow control valve, point
Solve gas flow control valve 15 current limliting 20mL/min, 13 flow velocity 360mL/min of the second air flow control valve, hydrogen flowing quantity control
14 flow velocity 38mL/min of valve, 250 DEG C of the operating temperature of flame ionization ditector 5.
(3) system calibrating：The methane volumetric fraction for taking 5mL, 25mL, 45mL, 65mL, 85mL, 120mL respectively is
37.92% nitrogen methylmethane calibrating gas, injects collection chamber 4 from air hatch 16, is examined with flame ionization ditector 5
Survey, by data processing unit of account volume methane signal area, complete to system calibrating.
(4) sample test：
1) instrument gas circuit is connected, instrument condition is set；
2) close the first air flow control valve 12, decompose gas flow control valve 15, open the second air flow control
Valve 13, hydrogen flowing quantity control valve 14；
3) igniting starts flame ionization ditector 5, reaches steady-working state；
4) air inlet check valve 8, gas outlet air circuit breaker 9 are closed；
5) empty mass of decomposition chamber 1 is measured on weight calculation component 2；
6) decomposition chamber 1 is opened, artificial synthesized gas hydrates sample is taken out from nitrogen storage tank, is immediately placed in decomposition
Fastened immediately behind room 1；
7) decomposition chamber 1 after load sample is placed on the weight calculation component 2 in temperature control chamber 3, measures its quality；
8) decomposition chamber 1 is connected with collection chamber 4, the first air flow control valve 12 respectively；
9) air inlet check valve 8, gas outlet air circuit breaker 9, the first air flow control valve 12 are opened and decomposes gas stream
Control valve 15；
10) flame ionization ditector 5 is detected to decomposing gas, gathers the inspection of flame ionization ditector 5
Data are surveyed, until detection signal returns baseline；
11) processing detection data, draw out light hydrocarbon gas decomposition rate curve and light hydrocarbon gas decompose progress curve.
(5) test result：
It can be observed from fig. 2 that the light hydrocarbon gas decomposition rate in artificial synthesized gas hydrates sample is in the incipient stage
Constantly rise, peak value 21.953mL/kg/min is reached in 22min, subsequent decomposition rate constantly reduces, in 47min
9.841mL/kg/min is dropped to, is then fluctuated between 7.9mL/kg/min~11.9mL/kg/min, finally in 341min,
Light hydrocarbon gas decomposition rate suddenly drops to 1.136mL/kg/min, and gas release finishes.
From figure 3, it can be seen that the methane volumetric of the artificial synthesized gas hydrates sample cumulative release of unit mass is
3477.7mL/kg, this i.e. its light hydrocarbon gas content.
The above is present pre-ferred embodiments and its technical principle used, comes for those skilled in the art
Say, without departing from the spirit and scope of the present invention, any equivalent transformation based on the basis of technical solution of the present invention,
Simple replacement etc. obviously changes, and all falls within the protection scope of the present invention.
Claims (8)
1. a kind of gas hydrates drill core light hydrocarbon gas content parses test system, it is characterised in that：It includes temperature control chamber, control
Warm intracavitary is equipped with weight calculation component, counts weight and places sealed decomposition chamber on component, is installed respectively on the air inlet of decomposition chamber, gas outlet
There are air inlet check valve, gas outlet air circuit breaker, be also equipped with pressure gauge and safety valve on decomposition chamber, air-source is fast by first
Fast gas path joint is connected with air inlet check valve, the air inlet that gas outlet air circuit breaker passes through the second Quick-acting gas connector and collection chamber
Mouth connection, the gas outlet of collection chamber, air-source, hydrogen source air inlet connection corresponding to flame ionization ditector respectively,
Air hatch is additionally provided with collection chamber；Collection chamber includes the air collecting chamber of open top, the open-mouth hermetically activity installation of air collecting chamber
There is gravity type piston, gravity type piston moves up and down and decomposed to buffer in decomposition chamber with the change of circulated gases amount in air collecting chamber
The pressure that gas produces；Decomposition chamber is the sealed decomposition chamber that can quickly open with fastening.
2. gas hydrates drill core light hydrocarbon gas content as claimed in claim 1 parses test system, it is characterised in that：
First air flow control valve is installed in the gas circuit between the air inlet of the air-source and the decomposition chamber；
It is empty that second is provided with gas circuit between air-source air inlet corresponding to the flame ionization ditector
Flow control valves；
Hydrogen stream is installed in gas circuit between hydrogen source air inlet corresponding to the flame ionization ditector
Control valve；
Installed in gas circuit between the air inlet corresponding to the flame ionization ditector of the gas outlet of the collection chamber
There is decomposition gas flow control valve.
A kind of 3. day that gas hydrates drill core light hydrocarbon gas content parsing test system based on described in claim 2 is realized
Right gas hydrate drill core light hydrocarbon gas content parsing test method, it is characterised in that it includes step：
1) the first air flow control valve, the decomposition gas flow control valve are closed, opens second air mass flow
Control valve, the hydrogen flowing quantity control valve, are monitored and control to gas coming through flow in gas circuit；
2) igniting starts the flame ionization ditector, reaches steady-working state；
3) the air inlet check valve, the gas outlet air circuit breaker is allowed to be closed；
4) decomposition chamber is placed on the weight calculation component of the temperature control intracavitary, measures its empty mass；
5) decomposition chamber is opened, is fastened immediately after gas hydrates drill core is quickly placed into the decomposition chamber, is made described
Decomposition chamber is in sealing state；
6) quality during decomposition chamber load sample is measured by the weight calculation component；
7) decomposition chamber by the second Quick-acting gas connector, the first Quick-acting gas connector respectively with the gas collection
Room, the first air flow control valve connect；
8) low temperature control is carried out to temperature residing for the decomposition chamber by the temperature control chamber, to avoid natural gas in the decomposition chamber
The decomposition rate of hydrate drill core is too fast；
9) the air inlet check valve, the gas outlet air circuit breaker are opened, and opens the first air flow control valve
With the decomposition gas flow control valve, gas coming through flow in gas circuit is monitored and controlled；
10) in the decomposition chamber after the parsing of gas hydrates drill core the decompositions gas that produces by the collection chamber preserve with
It is detected after cushioning effect into the flame ionization ditector；
11) the detection data of the flame ionization ditector are gathered, until gas hydrates drill core is decomposed completely；
12) obtained detection data are handled, the content of light hydrocarbon gas in unit mass gas hydrates drill core is calculated.
4. gas hydrates drill core light hydrocarbon gas content as claimed in claim 3 parses test method, it is characterised in that：
The temperature of the temperature control chamber is between 1 DEG C to 15 DEG C；
The upper limit of the first air flow control valve control air velocity is in 10mL/min between 12mL/min；
The second air flow control valve controls air velocity in 360mL/min between 365mL/min；
The hydrogen flowing quantity control valve controls hydrogen flow rate in 38mL/min between 40mL/min；
The upper limit for decomposing the decomposition gas flow rate that gas flow control valve controls the collection chamber to send out 25mL/min with
It is interior；
The operating temperature of the flame ionization ditector is controlled between 190 DEG C to 250 DEG C.
5. gas hydrates drill core light hydrocarbon gas content as claimed in claim 3 parses test method, it is characterised in that：
The step 12) further comprises：
The calibration value of unit volume methane signal area based on the flame ionization ditector, to the hydrogen flame ion
The detection data for changing the gas hydrates drill core catabolite that detector collects carry out Integral Processing, and calculate natural gas
Light hydrocarbon gas volume in hydrate drill core catabolite；With reference to the weight calculation component to gas hydrates in the decomposition chamber
The weighing data of drill core quality, calculates the light hydrocarbon gas content in unit mass gas hydrates drill core.
6. gas hydrates drill core light hydrocarbon gas content as claimed in claim 5 parses test method, it is characterised in that：
Based on the light hydrocarbon gas content in the unit mass gas hydrates drill core calculated, and by from the gas collection
The sample that the air hatch on room is gathered carries out the gas composition data that gas chromatographic analysis obtains, and calculates unit mass
The content of gas each component is decomposed in gas hydrates drill core.
7. gas hydrates drill core light hydrocarbon gas content as claimed in claim 3 parses test method, it is characterised in that：
Performing step 8~11) during, bored from the air hatch collection gas hydrates on the collection chamber
Core decomposes gaseous sample, to carry out gas chromatographic analysis or for preserving.
8. the gas hydrates drill core light hydrocarbon gas content parsing test method as any one of claim 3 to 7, its
It is characterized in that：
System calibrating step is further included, is specifically included：
1) decomposition chamber is fastened, the decomposition chamber is placed in the temperature control chamber；
2) decomposition chamber and the collection chamber, the air-source are connected；
3) the first air flow control valve, the second air flow control valve, the hydrogen flowing quantity control valve, institute are opened
State air inlet check valve, the gas outlet air circuit breaker and the decomposition gas flow control valve, to gas flow in gas circuit into
Row monitoring and control；
4) igniting starts the flame ionization ditector, reaches steady-working state；
5) after system stabilization, the Standard Gas of Methane accurately measured is injected from the air hatch, by the hydrogen flameionization
Detector detection and acquisition testing data, until whole methane are detected；
6) processing detection data, calculate the unit volume methane signal area of the flame ionization ditector, complete system
System calibration.
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| CN202362222U (en) * | 2011-11-21 | 2012-08-01 | 张金川 | Whole-course visualized gas content tester |
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| CN203319964U (en) * | 2013-06-07 | 2013-12-04 | 新地能源工程技术有限公司 | Device for removing water and heavy hydrocarbon out of shale gas |
| JP6357032B2 (en) * | 2014-06-27 | 2018-07-11 | 株式会社住化分析センター | Temperature-programmed desorption analyzer, sample stage used in the device, and temperature-programmed desorption analysis method |
| CN204330517U (en) * | 2015-01-09 | 2015-05-13 | 郭梅 | Under High Temperature High Pressure, the test of shale gas air content gathers and measuring apparatus |
| CN104655522A (en) * | 2015-02-02 | 2015-05-27 | 王思波 | On-site shale gas desorption analyzer |
| CN105259080A (en) * | 2015-11-12 | 2016-01-20 | 西南石油大学 | Shale gas reservoir gas diffusion coefficient experiment test method |
| CN205809058U (en) * | 2016-05-31 | 2016-12-14 | 中石化石油工程技术服务有限公司 | Shale gas gassiness testing stand |
| CN206892029U (en) * | 2017-06-23 | 2018-01-16 | 国家地质实验测试中心 | Gas hydrates drill core light hydrocarbon gas content parses test system |
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