CN105675434B - A kind of air content measuring system and measurement method - Google Patents

A kind of air content measuring system and measurement method Download PDF

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Publication number
CN105675434B
CN105675434B CN201610151600.7A CN201610151600A CN105675434B CN 105675434 B CN105675434 B CN 105675434B CN 201610151600 A CN201610151600 A CN 201610151600A CN 105675434 B CN105675434 B CN 105675434B
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China
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pressure
gas
bearing tank
sample
measuring
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CN201610151600.7A
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Chinese (zh)
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CN105675434A (en
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张金川
薛冰
唐玄
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中国地质大学(北京)
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N7/00Analysing materials by measuring the pressure or volume of a gas or vapour
    • G01N7/02Analysing materials by measuring the pressure or volume of a gas or vapour by absorption, adsorption, or combustion of components and measurement of the change in pressure or volume of the remainder
    • G01N7/04Analysing materials by measuring the pressure or volume of a gas or vapour by absorption, adsorption, or combustion of components and measurement of the change in pressure or volume of the remainder by absorption or adsorption alone
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N7/00Analysing materials by measuring the pressure or volume of a gas or vapour
    • G01N7/14Analysing materials by measuring the pressure or volume of a gas or vapour by allowing the material to emit a gas or vapour, e.g. water vapour, and measuring a pressure or volume difference

Abstract

The invention discloses a kind of air content measuring systems, including hermetically sealed can, temperature control box, pressue device and gas collecting apparatus, wherein:The hermetically sealed can includes the transfer cask for holding sample and the pressure-bearing tank for holding the transfer cask, and the transfer cask can stress be broken in pressure-bearing tank, and the pressure-bearing tank is equipped with injecting hole and gas vent;The temperature control box, for heating the pressure-bearing tank;The pressue device, for pressurizeing from injecting hole to pressure-bearing tank input methane gas;The gas collecting apparatus, for collecting the gas being discharged from the pressure-bearing tank gas vent.The invention also discloses a kind of gassiness measuring methods, recall thought based on temperature and pressure, the loss gas for measuring sample and desorption Gas content.The measuring system of the present invention is easy to operate, gas collection is convenient, accurate measurement, and measurement method result is reliable, can be that the evaluation of natural gas target zone, reserve estimate and Favorable Areas preferably provide important evidence.

Description

A kind of air content measuring system and measurement method

Technical field

The present invention relates to shale gas stock assessment field of measuring technique, more particularly to a kind of air content measuring system and survey Amount method.

Background technology

Shale air content is the main evaluation parameter of natural gas exploration and exploitation, to shale gassiness evaluation, resource reserve Prediction has great importance.And it is the key that determine shale air content reliability accurately to obtain loss tolerance.Desorption method is Shale air content most straightforward approach is measured, therefore is used as the basic skills of shale gas content measurement.Page in desorption method Rock air content is made of gas desorption quantity, loss Gas content and 3 part of residual volume.Wherein, loss Gas content is missed in desorption method The larger part of difference, it refers to the gas body that drill bit bores that chance rock stratum is released to rock core before well head taking-up loading solution cucurbitula Product.

Currently, instrument accurately measures loss tolerance not yet.Loss tolerance is generally obtained by pushing back calculating method It arrives, includes mainly return law of the straight line, polynomial regression and non-linear regression method.Explanation of the return law of the straight line to loss tolerance It is the approximate solution based on complete diffusion equation SMS message, diffusion rate is linear related to time square root;Polynomial regression Method is more stronger than coincideing property of return law of the straight line;Although nonlinear regression result between the result of linear regression and polynomial regression it Between, and related coefficient is higher, but does not provide diffusion rate accurately and change with time situation.Return law of the straight line, multinomial The Return Law and non-linear regression method estimation result can only substantially meet the requirement of exploration phase at initial stage.But in practical application In the process, there are following defects for above-mentioned computational methods:

1, return law of the straight line theory hypothesis is that diffusion rate is constant in nature desorption process, and in actually desorbing, shale Diffusion rate is the function changed over time.So can cause when the coring time is long, when losing large-minded, return law of the straight line is estimated Loss tolerance than it is actual loss it is narrow-minded more, error is larger.The loss tolerance that polynomial regression estimates is usual It is higher than actual loss tolerance.Non-linear regression method does not provide diffusion rate accurately and changes with time situation.And then influence knot The accuracy of fruit.

2, above-mentioned loss tolerance is all to estimate to obtain by the Return Law, and result of calculation differs larger with actual value.

3, above-mentioned loss tolerance is calculated value, can not analyze influence of the pressure and temperature to loss tolerance.

It can be seen that there are still larger defects for above-mentioned existing air content acquisition methods, and urgently it is further improved.Such as What can found a kind of easy to operate, accurate measurement, result reliable new air content measuring system and method, be used for gassiness sample The measurement of gas and stripping gas is lost, it is real to belong to current important one of the research topic in this field.

Invention content

The object of the present invention is to provide a kind of air content measuring system, keep its easy to operate, accurate measurement, result reliable, Especially loss tolerance measured deviation can be reduced with the loss tolerance of reliable measurements gassiness sample, it is existing to losing gas to overcome The measurement assessment result of amount often has deviation, cannot accurately reflect the deficiency of the true air content of sample.

A further object of the present invention is to provide a kind of gassiness measuring method, for being damaged to the gassiness sample such as shale The measurement of tolerance and gas desorption quantity is lost, measurement result is accurate, reliable.

To achieve the above object, the present invention adopts the following technical scheme that:

A kind of air content measuring system, including hermetically sealed can, temperature control box, pressue device and gas collecting apparatus, wherein:It is described close Sealed cans include the transfer cask for holding sample and the pressure-bearing tank for holding the transfer cask, and the transfer cask can be in pressure-bearing tank Interior stress is broken, and the pressure-bearing tank is equipped with injecting hole and gas vent;The temperature control box, for heating the pressure-bearing tank;It is described Pressue device, for pressurizeing from injecting hole to pressure-bearing tank input methane gas;The gas collecting apparatus, for collect from The gas of the pressure-bearing tank gas vent discharge.

As a further improvement, the inner surface of the pressure-bearing tank is equipped with the screw thread for assisting to be crushed the transfer cask And/or tapered protrusion.

The pressue device includes methane gas steel cylinder, booster pump, gas flowmeter and vacuum pump, the booster pump connection Methane gas steel cylinder and to the pressure-bearing tank gas injection, the gas flowmeter is for measuring the methane gas injected to the pressure-bearing tank The scale of construction, the vacuum pump is for vacuumizing the pressure-bearing tank before the supercharging pump work.

It is additionally provided with pressure gauge mounting hole on the pressure-bearing tank.

The gas collecting apparatus includes gas collection measuring cylinder and pressure balance adjuster, and the pressure balance adjuster includes installation Supporter in the gas collection measuring cylinder bottom is provided with collection gas port and osculum on the supporter, is equipped with below the osculum Diameter not equal metering hole, the pressure are along the circumferential direction distributed on pressure balance adjusting handle for pressure balance adjusting handle Balance adjustment handwheel lower section, the position for corresponding to the osculum are equipped with anti-down suction pipe.

The gas collection measuring cylinder carries out gas collection by fluid-discharge therapy, and liquid level information acquisition elements are equipped in the gas collection measuring cylinder.

Quickly connection check valve pin end, the Ji Qikouchu peaces of the gas collecting apparatus are set at the gas vent of the pressure-bearing tank Equipped with matching female connector.

Further include data acquisition and procession device, the data acquisition and procession device is defeated for obtaining the pressue device The gas flow that the gas flow gone out and the gas collecting apparatus are collected, and calculate the loss Gas content and desorption Gas content of sample.

A kind of gassiness measuring method carries out sample experiments by following steps:

A. sample to be tested is packed into transfer cask, be sealed, then transfer cask is packed into a pressure-bearing tank and is implemented secondary close Envelope;B. to the pressure-bearing tank vacuumize process, and demand temperature T is heated to pressure-bearing tank, pressure-bearing tank filling methane gas is arrived Demand pressure P1;There is provided certain external force makes the transfer cask in the pressure-bearing tank rupture, after a period of time, pressure stability in pressure-bearing tank And fall to P2, being filled with methane gas into pressure-bearing tank again at this time makes pressure recovery to P1, repeat to be filled with first if pressure declines Alkane gas, until pressure stability is in P1, it is N to record the methane gas total amount being filled in the step in pressure-bearing tank1;C. in pressure-bearing tank Upper connection gas collecting apparatus, recording the total gas output being precipitated from pressure-bearing tank when pressure recovery is to ambient pressure in pressure-bearing tank is M1;D. with above-mentioned methane gas total amount N1, total gas output M1Respectively as the loss gas and gas desorption quantity of sample, sample is calculated Lose Gas content and desorption Gas content.

As a further improvement, further including following contrast experiment:It takes direct with the calibrated bolck of sample to be tested same size It is put into pressure-bearing tank, same temperature T is heated to pressure-bearing tank vacuumize process, and to pressure-bearing tank, methane gas is filled to pressure-bearing tank Body is to same pressure P1, the methane gas scale of construction that record is filled with pressure-bearing tank is N0;Gas collecting apparatus is connected on pressure-bearing tank, record, which is worked as, to be held It is M to press the gas output of pressure recovery to pressure-bearing tank when ambient pressure in tank0;With the methane gas of sample experiments in the step D Total amount N1With the methane gas scale of construction N of contrast experiment0Loss tolerance of the difference as sample, with total gas output M of sample experiments1With The gas output M of contrast experiment0Gas desorption quantity of the difference as sample, calculate the loss Gas content and desorption Gas content of sample.

Due to the adoption of the above technical scheme, the present invention has at least the following advantages:

(1) air content measuring system of the invention, it is compact-sized, air-tightness is good, homogeneous heating, pressure stability, gas collection side Just, accurate measurement, easy to operate, the loss gas and stripping gas that can be used for gassiness sample measure, and simultaneously can be used for natural gas etc. Various gasmetries and collection.

(2) thought that measuring system and method for the invention are recalled based on temperature and pressure, by keeping gassiness sample in pressure-bearing tank extensive Contain gaseity under answering to formation condition and desorbed naturally under ground layer original Temperature-pressure Conditions, can accurately measure loss tolerance in this way And gas desorption quantity, and can be according to the methane tolerance analysis temperature and pressure that sample under different temperature, pressure absorbs to damage The influence of tolerance is lost, gassiness measurement is more accurate, and is more suitable for practicality.

(3) air content measuring system of the invention and method, can not only measure and lose tolerance in natural gas exploration and development, Simultaneously can also natural gas desorption process in mock standard rock, obtain gas desorption quantity, utilize air content structural analysis and temperature and pressure Backtracking method calculates air content etc., is natural gas target zone to provide important evaluation parameter for natural gas exploration and exploitation Evaluation, reserve estimate and Favorable Areas preferably provide important evidence.

Description of the drawings

The above is merely an overview of the technical solutions of the present invention, in order to better understand the technical means of the present invention, below In conjunction with attached drawing, the present invention is described in further detail with specific implementation mode.

Figure 1A, 1B are the structural schematic diagram of transfer cask and pressure-bearing tank respectively.

Fig. 2A is the structural schematic diagram of the pressure-bearing tank under use state.

Fig. 2 B are the structural schematic diagrams of gas collecting apparatus.

Fig. 3 is the structural schematic diagram under air content measuring system use state of the present invention.

Specific implementation mode

The present invention provides a kind of air content measuring system, includes mainly hermetically sealed can, temperature control box, pressue device and gas collection dress It sets, wherein:The hermetically sealed can includes the transfer cask for holding sample and the pressure-bearing tank for holding the transfer cask, the fortune Defeated tank can stress be broken in pressure-bearing tank, and the pressure-bearing tank is equipped with injecting hole and gas vent;The temperature control box, for heating State pressure-bearing tank;The pressue device, for pressurizeing from injecting hole to pressure-bearing tank input methane gas;The gas collection dress It sets, for collecting the gas being discharged from the pressure-bearing tank gas vent.Further, data acquisition and procession dress can also be set It sets, the gas flow that the gas flow and the gas collecting apparatus for obtaining the pressue device output are collected, and calculates sample Lose Gas content and desorption Gas content.

It please refers to Fig.1 shown in A, 1B, the hermetically sealed can includes 2 two kinds of transfer cask 1 and pressure-bearing tank.Wherein, transfer cask 1 is by close Capping 11 and tank body 12 form, and transfer cask 1 is sealed up for safekeeping gassiness sample is closed, transport easy to carry, and transfer cask 1 is using frangible but have The material of certain anti-pressure ability, it is rupturable under external force collision.What pressure-bearing tank 2 was fixedly connected by tank body 21, with 21 one end of tank body Bottom cover 22 is formed with the head cover 23 that the tank body other end is detachably connected, and is inclined-plane between 23 middle part of head cover and 23 outer rim of head cover, just In being collected when gas is very small.Snapping between tank body 21 and head cover 23, can be improved operating efficiency, avoid gas escape. 12 diameter of tank body of transfer cask 1 is slightly less than the tank body 21 of pressure-bearing tank 2, so that transfer cask 1 can be put into pressure-bearing tank 2, simultaneously It can exclude air as far as possible again.It is preferably provided to rough surface on the inner surface of tank body 21, can be used for assisting being crushed the fortune Defeated tank 1.As a kind of specific example, as shown in Figure 1B, 21 side wall of tank body of pressure-bearing tank 2 is equipped with screw thread, bottom cover 22 be equipped with to 21 inside bullet outstanding of tank body.

It please referring to shown in Fig. 2A, is opened on the head cover 23 of the pressure-bearing tank 2 there are three through-hole, one of them is injecting hole 24, Pressure reducing valve can be connected at injecting hole 24, second is gas vent 25, the last one connection pressure gauge 26, wherein gas vent 25 is set In 23 middle part of the head cover, other two hole divides row gas vent 25 both sides.

It please refers to shown in Fig. 2 B, the gas collecting apparatus 3 includes gas collection measuring cylinder 31, pressure balance adjuster 32 and protection support cover 37, graduation mark can be identified on gas collection measuring cylinder 31, protection support cover 37 also has in addition to protective effect and supports and stablize gas collecting apparatus 3 Effect.The pressure balance adjuster 32 includes supporter 35, pressure balance adjusting handle 33, anti-down suction pipe 36.Supporter 35 are connected to 31 bottom of gas collection measuring cylinder by tightening screw, and supporter 35 is equipped with osculum, is pressure below the osculum Balance adjustment handwheel 33, pressure balance adjusting handle 33 are along the circumferential direction sequentially distributed diameter not equal current limliting from small to large Hole, such as the metering hole that 6 diameters are respectively 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm can be set.Anti-down suction pipe 36 is pacified Mounted in 33 lower section of pressure balance adjusting handle, the position of 36 nozzle of anti-down suction pipe and a through-hole on pressure balance adjusting handle 33 Quite, the diameter of osculum is suitable with the maximum limit the diameter of flowing hole of pressure balance adjusting handle 33 on supporter 35.Work as supporter On 35 when the through-hole coincidence of osculum, 36 nozzle of anti-down suction pipe, pressure balance adjusting handle 33, osculum is opened, gas collection It is in communication with the outside inside graduated cylinder 31.

It is additionally provided with collection gas port 34 on gas collecting apparatus 3, integrates gas port 34 as shown in Figure 2 B as the position in its center of supporter 35 Trepanning.The collection gas port 34 with the gas vent 25 on pressure-bearing tank 2 for being correspondingly connected with.In order to realize quick connection, the two it Between can be used quickly connection check valve pin thread and female thread be connected.Specifically, quickly connection can be installed at gas vent 25 The pin thread of check valve, the matched female thread of installation at collection gas port 34, to realize that the nothing between pressure-bearing tank 2 and gas collecting apparatus 3 is led Tubular type is directly connected to.

The sensing element of liquid level information can be acquired by being additionally provided in the gas collection measuring cylinder 31, and the liquid level information acquisition elements exist It is used when gas collecting apparatus 3 is using drainage gas collection.

Heating chamber 41 is offered on temperature control box 4, the internal diameter of the heating chamber 41 is suitable with the outer diameter of the pressure-bearing tank 2, adds Hot chamber 41 is open on the top plate 43 of the temperature control box 4, forms one and the comparable through-hole of 2 outer diameter of pressure-bearing tank, and through-hole surrounding is solid Determine heating element and insulating layer, the temperature controller 42 of monitoring box body temperature, the heating element and temperature controller are additionally provided in temperature control box 4 42 connect with the power interface 44 being set on babinet.

Pressue device 5 includes mainly booster pump 51, steel cylinder 52, gas flowmeter and vacuum pump.In use, steel cylinder 52 provides Gas-pressurized, steel cylinder 52 are connect by pipeline with booster pump 51, and booster pump 51 is connected by the injecting hole 24 on pipeline and pressure-bearing tank 2 It connects, gas flowmeter may be provided on the pipeline of injecting hole 24, for measuring the methane gas injected into the pressure-bearing tank 2 The scale of construction;Vacuum pump is used to before the work of the booster pump 51 vacuumize the pressure-bearing tank 2, when use can on pressure-bearing tank 2 Gas vent 25 connected by pipeline.

Host computer realization can be used in the data Collection & Processing System, and host computer connects and acquires the gas collecting apparatus 3 Liquid level information acquisition elements and pressue device 4 gas flowmeter record data, and further to these gathered datas It is handled, obtains final gassiness measurements.

After the above design, air content measuring system of the invention is compact-sized, air-tightness is good, homogeneous heating, pressure It is stabilization, gas collection convenience, accurate measurement, easy to operate, it can be used for the loss gas and stripping gas content measurement of gassiness sample, while It can be used for the various gasmetries such as natural gas and collection, thus more suitable for practicality.

The present invention also provides a kind of gassiness measuring methods, for carrying out accurately loss gas to the gassiness sample such as shale The measurement of amount and gas desorption quantity.As an implementation, below in conjunction with above-mentioned measuring system to the measurement side of the present invention Method does specific introduction:

Before experiment, booster pump 51 can be advanced with and tested to the air-tightness of transfer cask 1, pressure-bearing tank 2.For example, to It is filled with a certain amount of gas in transfer cask 1 and pressure-bearing tank 2, seals, is then placed in water, no bubble occurs illustrating transfer cask 1 With 2 good airproof performance of pressure-bearing tank, opened after taking-up for use.

Include mainly following measuring process when to gassiness sample experiments to be measured:

(1) transfer cask 1, pressure-bearing tank 2 and gas collecting apparatus 3 are taken out.

(2) 1 sealing cover 11 of transfer cask is opened, gassiness sample is quickly packed into, is sealed.The gassiness sample of selection as possible will Space in transfer cask 1 all occupies, and can utmostly reduce influence of the air to gassiness measurement in this way.

(3) 2 head cover 23 of pressure-bearing tank is opened, transfer cask 1 is packed into pressure-bearing tank 2 and implements secondary seal, after assisting Phase is crushed transfer cask 1, can also be put into grinding-material together at this time.

(4) by 2 vacuumize process of pressure-bearing tank, then 2 head cover 23 of pressure-bearing tank is put into heating chamber vertically upward.Connect electricity Pressure-bearing tank 2 is heated up to need temperature T using heating element 41 and temperature controller 42, be filled into pressure-bearing tank 2 using booster pump 51 by source Enter methane gas to demand pressure P1.At this point, temperature control box 4 and pressue device 5 provide satisfaction solution for gassiness sample in pressure-bearing tank 2 Inhale stratum original temperature, the pressure environment of requirement of experiment.Certain external force is provided to pressure-bearing tank 2, so that transfer cask 1 is ruptured, at one section Between after pressure stability in pressure-bearing tank 2, at this time pressure fall to P2;It is filled with methane gas into pressure-bearing tank 2 again, makes pressure recovery To P1, wait after pressure stabilisation, repeat the above steps, until pressure stability is in P1, the full mistake of the step is recorded by gas flowmeter The total amount that methane gas is filled in journey is N1, the uptake of value expression sample, it is believed that be equal to loss tolerance.

(5) saturated salt solution will be filled in gas collection measuring cylinder 31, then be inverted and be connected to pressure-bearing tank 2, and open pressure balance tune The osculum for saving device 32 makes in pressure-bearing tank 2 pressure recovery to P0(1 atmospheric pressure), liquid level acquisition elements time recording collection tolerance Liquid level position in cylinder 31, and it is M to obtain final total gas output1, value expression sample gas output, it is believed that be equal to gas desorption quantity.

(6) data acquisition and procession module receives and stores the data and liquid level acquisition elements of gas flowmeter record The time of acquisition and gas output data, and these data are further processed, loss Gas content and stripping gas content are obtained, into one Step ground, can also by final gas desorption quantity with time relationship compared with contrast experiment, standard desorption curve can be obtained.

(7) experiment terminates, and closes the osculum of pressure balance adjuster 32, and disconnects the company of gas collecting apparatus and pressure-bearing tank 2 It is logical.Since 31 air-tightness of gas collection measuring cylinder is good, gas sample can be stored in gas collection measuring cylinder 31, if you need to acquire the gas in graduated cylinder, Gas port 34 will be collected upward, and use the pin thread connection i.e. sampling to match.

Further, so that measurement result is more accurate, absolute loss tolerance and gas desorption quantity can be obtained, it can be with Following contrast experiment is added on the basis of above-mentioned measurement process:

Take with the calibrated bolck of laboratory sample same size (such as iron block, not adsorbed methane), be put into pressure-bearing tank 2, seal Then vacuumize process afterwards utilizes heating element 41 and temperature controller 42 that 2 temperature-pressure of pressure-bearing tank to same temperature T, is utilized increasing Methane gas is added into pressure-bearing tank 2 to same pressure P for press pump1, methane gas scale of construction N is filled with using gas flowmeter record0.It will Saturated salt solution is filled in gas collection measuring cylinder 31, is then inverted and is connected to pressure-bearing tank 2, opens the draining of pressure balance adjuster 32 Hole makes in pressure-bearing tank 2 pressure recovery to P0(1 atmospheric pressure), liquid level position in liquid level acquisition elements time recording gas collection measuring cylinder 31 It sets, and obtains final total gas output and be denoted as M0

After above-mentioned contrast experiment is added, the loss tolerance utilizes the methane gas scale of construction (N of contrast experiment's record0) and it is to be measured The methane gas scale of construction (the N recorded when sample experiments1) calculate, at this point, loss tolerance N2=N1–N0.The gas desorption quantity utilizes comparison Gas output (the M of experimental record0) and sample to be tested final gas output (M for recording when testing1) calculate, at this point, gas desorption quantity M2= M1–M0

In conclusion the present invention is utilized the former thinking of returning of sample regression to prime stratum state, to holding in experimentation Tank 2 is pressed to carry out temperature-pressure, gases used pressurization is methane, to which sample in pressure-bearing tank 2 is restored to prime stratum state, so Afterwards desorption Gas content is obtained by depressurizing to desorb.Loss Gas content, the desorption Gas content of gaseous sample can be surveyed together in this way Amount, and can be according to the methane tolerance analysis temperature and pressure that sample under different temperature, pressure absorbs to loss tolerance It influences, gassiness measurement is more accurate, and is more suitable for practicality.

Due to using the technology described above, air content measuring system of the invention and method can not only measure natural gas Lose tolerance in exploration and development, at the same can also natural gas desorption process in mock standard rock, gas desorption quantity is obtained, by containing Tolerance structural analysis and temperature and pressure backtracking method calculate air content etc., to provide important evaluation ginseng for natural gas exploration and exploitation Number preferably provides important evidence for the evaluation of natural gas target zone, reserve estimate and Favorable Areas.

The above described is only a preferred embodiment of the present invention, be not intended to limit the present invention in any form, this Field technology personnel make a little simple modification, equivalent variations or modification using the technology contents of the disclosure above, all fall within this hair In bright protection domain.

Claims (10)

1. a kind of gassiness measuring method, which is characterized in that carry out sample experiments by following steps:
A. sample to be tested is packed into transfer cask, be sealed, then transfer cask is packed into a pressure-bearing tank and implements secondary seal;
B. to the pressure-bearing tank vacuumize process, and demand temperature T is heated to pressure-bearing tank, pressure-bearing tank filling methane gas is arrived Demand pressure P1;There is provided certain external force makes the transfer cask in the pressure-bearing tank rupture, after a period of time, pressure stability in pressure-bearing tank And fall to P2, being filled with methane gas into pressure-bearing tank again at this time makes pressure recovery to P1, repeat to be filled with first if pressure declines Alkane gas, until pressure stability is in P1, it is N to record the methane gas total amount being filled in the step in pressure-bearing tank1
C. gas collecting apparatus is connected on pressure-bearing tank, record is precipitated when pressure recovery is to ambient pressure in pressure-bearing tank from pressure-bearing tank Total gas output be M1
D. with above-mentioned methane gas total amount N1, total gas output M1Respectively as the loss gas and gas desorption quantity of sample, sample is calculated Lose Gas content and desorption Gas content.
2. a kind of gassiness measuring method according to claim 1, which is characterized in that further include following contrast experiment:
The calibrated bolck with sample to be tested same size is taken to be directly placed into pressure-bearing tank, to pressure-bearing tank vacuumize process, and to pressure-bearing Tank is heated to same temperature T, and methane gas is filled to same pressure P to pressure-bearing tank1, record the methane gas scale of construction for being filled with pressure-bearing tank For N0
Gas collecting apparatus is connected on pressure-bearing tank, record gas output of pressure-bearing tank when pressure recovery is to ambient pressure in pressure-bearing tank is M0
With the methane gas total amount N of sample experiments in the step D1With the methane gas scale of construction N of contrast experiment0Difference as sample Loss tolerance, with total gas output M of sample experiments1With the gas output M of contrast experiment0Gas desorption quantity of the difference as sample, meter Calculate the loss Gas content and desorption Gas content of sample.
3. a kind of air content measuring system of application gassiness measuring method as claimed in claim 1 or 2, which is characterized in that packet Hermetically sealed can, temperature control box, pressue device and gas collecting apparatus are included, wherein:
The hermetically sealed can includes the transfer cask for holding sample and the pressure-bearing tank for holding the transfer cask, the transfer cask It stress can be crushed in pressure-bearing tank, the pressure-bearing tank is equipped with injecting hole and gas vent;
The temperature control box, for heating the pressure-bearing tank;
The pressue device, for pressurizeing from injecting hole to pressure-bearing tank input methane gas;
The gas collecting apparatus, for collecting the gas being discharged from the pressure-bearing tank gas vent.
4. a kind of air content measuring system according to claim 3, which is characterized in that set on the inner surface of the pressure-bearing tank It is useful for the screw thread and/or tapered protrusion assisting to be crushed the transfer cask.
5. a kind of air content measuring system according to claim 3, which is characterized in that the pressue device includes methane gas Body steel cylinder, booster pump, gas flowmeter and vacuum pump, the booster pump connect methane gas steel cylinder and are noted to the pressure-bearing tank Gas, the gas flowmeter are used for for measuring the methane gas scale of construction injected to the pressure-bearing tank, the vacuum pump in the increasing The pressure-bearing tank is vacuumized before press pump work.
6. a kind of air content measuring system according to claim 3, which is characterized in that be additionally provided with pressure on the pressure-bearing tank Table mounting hole.
7. a kind of air content measuring system according to claim 3, which is characterized in that the gas collecting apparatus includes collection tolerance Cylinder and pressure balance adjuster, the pressure balance adjuster include the supporter mounted on the gas collection measuring cylinder bottom, institute It states and is provided with collection gas port and osculum on supporter, pressure balance adjusting handle is equipped with below the osculum, pressure balance is adjusted Diameter not equal metering hole, the pressure balance adjusting handle lower section, the corresponding draining are along the circumferential direction distributed on handwheel The position in hole is equipped with anti-down suction pipe.
8. a kind of air content measuring system according to claim 7, which is characterized in that the gas collection measuring cylinder passes through fluid-discharge therapy Gas collection is carried out, liquid level information acquisition elements are equipped in the gas collection measuring cylinder.
9. a kind of air content measuring system according to claim 7, which is characterized in that set at the gas vent of the pressure-bearing tank It sets quickly connection check valve pin end, the Ji Qikouchu of the gas collecting apparatus and matching female connector is installed.
10. according to a kind of air content measuring system of claim 3-9 any one of them, which is characterized in that further include that data are adopted Collection and processing unit, the data acquisition and procession device are used to obtain the gas flow of the pressue device output and the collection The gas flow that device of air is collected, and calculate the loss Gas content and desorption Gas content of sample.
CN201610151600.7A 2016-03-16 2016-03-16 A kind of air content measuring system and measurement method CN105675434B (en)

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CN106290058B (en) * 2016-08-25 2019-05-07 中国石油天然气股份有限公司 A kind of measuring method and device of rock gassiness data
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