CN106124735A

CN106124735A - From being conigenous storage synclinal structure basin Water Soluble Gas transported simulation device

Info

Publication number: CN106124735A
Application number: CN201610578968.1A
Authority: CN
Inventors: 张军龙; 李建军
Original assignee: 张军龙; 李建军
Current assignee: Institute of Earthquake Science China Earthquake Administration; North University of China
Priority date: 2016-07-21
Filing date: 2016-07-21
Publication date: 2016-11-16
Anticipated expiration: 2036-07-21
Also published as: CN106124735B; CN108490149A; CN108490149B; CN108508179A; CN108508179B

Abstract

The invention discloses a kind of from being conigenous storage synclinal structure basin Water Soluble Gas transported simulation device, including: reservoir simulation system, water system, gas-liquid recovery system, sample collection system, saturated and pumped vacuum systems, lifting control system and thermostatic control system, wherein reservoir simulation system includes simulating pipeline, being provided with multiple sampled point on simulation pipeline, this reservoir simulation system is placed in thermostatic control system；Water system is connected by pipeline with reservoir simulation system, for reservoir simulation system water supply；Gas-liquid recovery system and sample collection system are all connected by pipeline with reservoir simulation system, collect reservoir simulation system effluent air and liquid；Saturated it is connected with reservoir simulation system by pipeline with pumped vacuum systems；Lifting control system is used for suspending reservoir simulation system in midair.Apparatus structure of the present invention is simple, and floor space is little, and simulation experiment method is accurate, simple, provides the foundation theory support for the exploitation of coal bed gas/shale gas.

Description

From being conigenous storage synclinal structure basin Water Soluble Gas transported simulation device

Technical field

The present invention relates to Unconventional forage gas storage synclinal structure basin formation water solution gas (abbreviation Water Soluble Gas) migration energy Power and Water Soluble Gas, to reservoir gas carbon isotope fractionation Mechanism simulation device, belong to hyposmosis from being conigenous storage Unconventional forage Water Soluble Gas migration rule and isotope in (such as coal bed gas/shale gas) synclinal structure basin solid, liquid and gas three-phase blending agent Fractionating technology field.

Background technology

At present, Unconventional forage is become the contribution hidden to start to come into one's own by Water Soluble Gas, the hydro carbons gas dissolved in formation water Body is called for short Water Soluble Gas, and Water Soluble Gas is the most also the important shape of Unconventional forage (including coal bed gas/shale gas) occurrence status One of formula.Unconventional forage generate and Migration during all the time with formation water association, formation water may be to unconventional Gas component, carbon isotope produce fractionation, and this may also be that Unconventional forage (such as coal bed gas) carbon isotope lightens A reason.But how Water Soluble Gas affects the distribution of reservoir basin gas-bearing property？The formation water of flowing dissolves and carrying reservoir gas After body, the mechanism of reservoir gas carbon isotope fractionation how？These problems all need to be studied further.To this end, present invention design Indoor physical simulation device, simulation Unconventional forage (coal bed gas/shale gas) gas storage synclinal structure basin section geometry is special Groundwater Flow of seeking peace feature, the ability of Study of The Underground water flow process dissolved gas and the shadow to gas stable isotope fractionation Ring, provide data supporting for Coalbed Methane and study on the genesis.

Unconventional forage (coal bed gas/shale gas) has from the feature being conigenous storage, the typical geology structure favourable to it For synclinal structure or a wing of synclinal structure.The universal form of synclinal structure is that both wings tilt, and middle part is the mildest.Underground, basin The supply of water is to appear in both wings water-bearing layer, then along water-bearing layer to Basin Central runoff, and under the effect of head pressure difference, from Water-bearing layer appear relative elevation relatively low one the wing overflow, overflow end be referred to as discharge area, an of a relatively high wing is referred to as feeding area, two Confined area it is referred to as between wing water level elevation line.As it is shown in figure 1, for be certainly conigenous storage Unconventional forage (include coal bed gas/ Shale gas) reservoir basin, both wings can be pressed reservoir inclined degree classified types, typically can be divided into nearly horizontal segment (α≤5 °), delay Tilting section (5 ° of ＜ α≤15 °), tilting section (15 ° of ＜ α≤35 °), high-dipping section (α ＞ 35 °), and thus calculate each division section Length, determine the syntagmatic between section difference tilting section, Pick up Profile morphological characteristic, provide base for simulation laboratory test Plinth data.

Summary of the invention

The technical problem to be solved is to provide a kind of Unconventional forage gas storage synclinal structure basin formation water The analog that reservoir gas carbon isotope fractionation is affected by solution gas (abbreviation Water Soluble Gas) migration ability, Water Soluble Gas, it is possible to mould Intend hyposmosis from being conigenous storage Unconventional forage (such as coal bed gas/shale gas) synclinal structure basin solid, liquid and the mixing of gas three-phase Water Soluble Gas migration rule in medium, Water Soluble Gas to the distribution of reservoir gas gas-bearing property and gas isotope fractionation, simultaneously this Bright device can also complete the seepage simulation test of gas dissolution capacity simulation experiment and three-phase medium.

For solve above-mentioned technical problem, the technical solution adopted in the present invention includes: reservoir simulation system, water system, Gas-liquid recovery system, sample collection system, saturated and pumped vacuum systems, lifting control system, thermostatic control system and associated Adapter road.Reservoir simulation system includes 3 the hollow simulation pipelines being linked in sequence, and corresponds respectively to both wings and the core of synclinal structure Heart region, its length and the gradient are made by certain likelihood ratio according to prototype basin profile morphology, are used for simulating hyposmosis spontaneous Water Soluble Gas in storage Unconventional forage (such as coal bed gas/shale gas) synclinal structure basin solid, liquid and gas three-phase blending agent The simulation laboratory tests such as the seepage flow of migration rule, Water Soluble Gas isotope fractionation rule, gas dissolution capacity and three-phase medium.Simulation Pipeline one end is connected with water system, draws a sampling tube simultaneously, and water system can be that reservoir simulation system provides stable The hydraulic pressure field of force and constant current；The other end is connected with gas-liquid recovery system, also can also serve as 1 sampling tube simultaneously, and gas-liquid reclaims system System is responsible for collecting gas and the liquid flowing out reservoir simulation system.In order to test early-stage preparations and intermediate samples, at simulation pipeline The mesophase position that connects arranges 2 sampling tubes again, and every sampling tube is divided into two again, connects saturated and pumped vacuum systems respectively And sample collection system.Need also to draw sampling tube, with sample at both wings simulation pipeline slope change position according to research simultaneously Product acquisition system connects.In saturated and pumped vacuum systems can make simulation pipeline, sample forms gassiness saturation, simulates self certainly The storage saturated reservoir of gassiness, reduction original uniform gas-bearing reservoir.Simulation pipeline difference can be adopted by sample collection system by design requirement Sampling point carries out sample collecting, the change of sample properties during analysis mode, provides data supporting for follow-up study.Lifting Control system includes fixed mount and boom hoisting, and fixed mount is suspended under boom hoisting, for fixing the 3 of reservoir simulation system Bar simulation pipeline and fractional-sample pipeline, reservoir simulation system flexibly connects with the flexible pipe that is connected by of other system, it is simple to rise Device for hoisting lifting and landing reservoir simulation system, make simulation pipeline be immersed under the calorstat liquid level of thermostatic control system or lift It is raised on liquid level.Thermostatic control system provides stationary temperature field for reservoir simulation system.

For realizing the purpose of the present invention, it is achieved by the following technical solutions:

It is a kind of that oneself is conigenous storage synclinal structure basin Water Soluble Gas transported simulation device, including: reservoir simulation system, confession water system System, gas-liquid recovery system, sample collection system, saturated and pumped vacuum systems, lifting control system and thermostatic control system, its In:

Reservoir simulation system includes simulating pipeline, and simulation pipeline is provided with multiple sampled point, and this reservoir simulation system is put Putting in thermostatic control system, thermostatic control system provides predetermined operating temperature for reservoir simulation system；

Water system is connected by pipeline with reservoir simulation system, for reservoir simulation system water supply；

Gas-liquid recovery system and sample collection system are all connected by pipeline with reservoir simulation system, collect reservoir simulation system System effluent air and liquid；

Saturated it is connected with reservoir simulation system by pipeline with pumped vacuum systems, to the sample of filling in reservoir simulation system Evacuation and carry out the saturated process of gases at high pressure；

Lifting control system is used for suspending reservoir simulation system in midair, to put it in thermostatic control system or from thermostatic control System hangs out.

Synclinal structure basin Water Soluble Gas transported simulation device is stored up in described being certainly conigenous, preferably:

Thermostatic control system includes calorstat and temperature sensor, fills liquid in calorstat.

Reservoir simulation system includes the first simulation pipeline, the second simulation pipeline and the 3rd simulation pipeline, the first simulation pipeline Being interconnected by the 3rd simulation pipeline with the second simulation pipeline lower end, the upper end of the first simulation pipeline and the second simulation pipeline is divided Not arranging the 4th sampled point and the first sampled point, described 4th sampled point and the first sampled point connect sample by connecting line respectively Product acquisition system and gas-liquid recovery system, the 4th sampled point connects water system by connecting line；First simulation pipeline with The junction of the junction of the 3rd simulation pipeline and the second simulation pipeline and the 3rd simulation pipeline is respectively provided with the 3rd sampled point With the second sampled point, any one in the 3rd sampled point and the second sampled point respectively by connecting line and sample collection system and Gas-liquid recovery system connects and is connected with pumped vacuum systems with saturated.

Lifting control system includes slinging beam, two vertical fixed mounts, a horizontal fixed mount and boom hoisting, two Vertical fixed mount is respectively used to fix the first simulation pipeline and the second simulation pipeline and sampled point draws pipeline, horizontal fixed mount For fixing the 3rd simulation pipeline；Two vertical fixed mounts are suspended on slinging beam two side lower part respectively, and horizontal fixed mount is two The bottom level of individual vertical fixed mount is arranged, and bottom with these two vertical fixed mounts respectively, its two ends is connected, slinging beam quilt Boom hoisting is suspended on the lower section of boom hoisting.

Water system includes feed pump, water pressure gauge, water supply valve, constant pressure valve and storage tank；

Feed pump is connected by supply channel with reservoir simulation system, arranges feed water valve between this supply channel and feed pump Door and water pressure gauge, storage tank provides, for feed pump, the connecting tube that water source, constant pressure valve be arranged between adapter and the first sampled point Lu Shang, coordinates feed pump to set reservoir simulation system pressure.

Feed pump is connected by supply channel with the 4th sampled point of the first simulation pipeline upper end of reservoir simulation system.

The liquid stored in storage tank is: basin formation water, deionized water or pure water.

Gas-liquid recovery system includes that air gauge, the first excretory duct, valve, gas-liquid separator, gas returnable, liquid return Receptacle；

Described gas-liquid separator is divided into gas-liquid separation chamber and overflow chamber's two parts by its internal vertical median septum, and gas-liquid is divided Connecting in bottom with overflow chamber from room, top, overflow chamber has a hole, is connected by pipeline with liquid collection receptacle, and gas-liquid is divided Have two holes from ceiling portion, a hole is connected with gas returnable by pipeline, and this pipeline is provided with valve, and another hole is passed through First excretory duct is connected with the port that goes out of adapter, and the first excretory duct is provided with valve, and the first excretory duct pipe end inserts in gas-liquid 1/2 height of gas-liquid separator, and the distance bottom distance gas-liquid separation chamber it is not more than bottom middle-range gas-liquid separation chamber of separation chamber The distance bottom median septum distance from bottom gas-liquid separation chamber not less than 2～3 times.

Described is conigenous storage synclinal structure basin Water Soluble Gas transported simulation device certainly, it is preferred that this analog also includes Adapter；Wherein:

Described adapter is to have multiple inlet sides mouth and a pipeline connecting device going out port, multiple inlet sides of adapter Mouth is connected by multiple sampled points of pipeline with the simulation pipeline of reservoir simulation system respectively；The port that goes out of adapter passes through first Excretory duct connects gas-liquid recovery system, and the first excretory duct pipeline is provided with valve；Adapter go out port also by second row Let out pipe to be connected with sample collection system, the second excretory duct pipeline is provided with valve.

Described storage synclinal structure basin Water Soluble Gas transported simulation device of being certainly conigenous, the most described first excretory duct and the One end of two excretory ducts is connected with the port that goes out of adapter after being connected with each other again.

Described is conigenous storage synclinal structure basin Water Soluble Gas transported simulation device certainly, it is preferred that sample collection system includes Sample collecting pipeline gentle liquid separating apparatus two parts, wherein:

Described sample collecting pipeline is the connecting line between the inlet side mouth of adapter and the sampled point of simulation pipeline, every Being respectively provided with air gauge and valve on pipeline, described sample collecting pipeline mixes for the gas-liquid gathering reservoir simulation system different parts Closing sample, the collection pipeline of different sampled points is collected to adapter, inlet side mouth connection corresponding with adapter respectively, then by The port that goes out of adapter is connected to gas-liquid separation device by the second drain line；

Described gas-liquid separation device includes that valve, gas-liquid separator, gas pressure balancing bottle, gas-collecting pipe and temperature pass Sensor；

Described gas-liquid separator is at the lateral opening hole near bottom and the airtight transparent vessel at top drilling, and side Mark picture scale, a hole in top drilling is installed gas-collecting pipe, gas-collecting pipe is installed collection and confinement of gases valve, gas receipts Collector pipe end flushes with container top；The second excretory duct is inserted in another hole, and the second excretory duct is provided with valve, the second excretory duct Pipe end deeply inserts in gas-liquid separator and is not more than at 1/3 height away from bottom under liquid level；3rd hole mounting temperature sensor；

Described gas pressure balancing bottle is the transparent open-top receptacle in side opening 2 hole, near top, for spout hole, overflows in a hole Flush along height with gas-liquid separation bottle top under discharge orifice；Another hole is bottom container bottom, position of opening and gas-liquid separation bottle Lateral opening hole height is identical, and this another hole and gas separating bottle bottom sides perforate are by pipeline connection, gas pressure balancing bottle Interior placement feed pipe, the feed pipe other end connects storage tank, feed pipe arranges valve.

During work, filling water in gas-liquid separator and gas pressure balancing bottle, height of water level is in place along institute under spout hole Putting, gas-liquid separator top does not interspaces.

Saturated and pumped vacuum systems includes vacuum pump, valve, high-pressure air feed source, pressure valve, air relief valve, air gauge, confession Gas mass flowmenter, threeway；

High-pressure air feed source needs to provide different types of gas according to supply；

It is provided with pressure valve, air relief valve, air gauge on main supply air line between threeway the first end and high-pressure air feed source With quality of filling gas effusion meter；Threeway the second end is connected with vacuum pump by pipeline, and this pipeline also is provided with valve；Threeway the 3rd end Connecting one end of supply air line, this supply air line other end separates two branch roads, every branch road respectively with the second sampled point and the Three sampled points connect, and two branch roads are respectively arranged with a valve.

Synclinal structure basin Water Soluble Gas transported simulation device is stored up in described being certainly conigenous, preferably: reservoir simulation system and confession Flexible pipe is all used to flexibly connect between water system, gas-liquid recovery system, sample collection system and saturated and pumped vacuum systems.

A kind of from being conigenous storage synclinal structure basin Water Soluble Gas transported simulation experimental technique, the method uses from being conigenous storage to tiltedly Tectonic basin Water Soluble Gas transported simulation device is tested, and wherein this experimental technique includes simulation experiment step, and this step includes:

1) before starting experiment, by all valve closings of analog；

2) vacuum pump valve and vacuum pump are opened, to reservoir simulation systems stay evacuation until reservoir simulation system is built-in There is not residual gas in sample, enters next step；

3) open the pressure valve of high pressure gas cylinder to be measured, regulate air relief valve, set supply gas pressure P (supply gas pressure P=(1.2 ～1.5) p, p be prototype basin reservoir hydrostatic pressure, p=γ h, wherein γ is the severe of water, true reservoir buried depth), persistently supply Until whole air gauge stable reading, closing presure valve, enter next step；Record mass-flow gas meter and air gauge simultaneously Numerical value；

4) opening water supply valve, regulate constant pressure valve, open feed pump, feed pump is with slightly above prototype basin reservoir hydrostatic pressing The level of power p (p=γ h, wherein γ is the severe of water, and h is reservoir buried depth) is stable in the simulation pipeline of reservoir simulation system Water filling, the liquid in the first excretory duct arrives gas-liquid separator, realizes gas-liquid separation in gas-liquid separator, and gas passes through gas Valve in recovery pipe is discharged, returnable collect, and liquid flows through overflow chamber, liquid collection receptacle collect；

5) gas sample acquisition: gather the gas sample of multiple sample point successively；

6) until sampling time next time, step 5 is repeated) sample, so circulate, until sampling terminates.

Described experimental technique, preferably: the step 5 in simulation experiment step) including: according to test requirements document, determine and adopt Sample time interval, gathers the first sampled point～the gas sample of the 4th sample point the most successively, wherein,

When gathering the sample of the first sample point, closing liquid reclaims valve, opens the valve on the second drain line, quiet Putting certain time, observe gas-liquid separation bottle side scale, record generates the time used by certain volume gas, records temperature sensing The reading of device, opens collection and confinement of gases valve, collects gaseous sample, numbers gaseous sample, closes the valve in the first sample lines Valve on door and the second excretory duct, opens the valve on feed pipe, refills gas-liquid separator and gas pressure with liquid Equilibration flask, makes the hydraulically full rear top of gas-liquid separator not interspace, and closes feed pipe valve, and the first sampled point sampling is complete；

When gathering the sample of the second sample point, open the valve in the second sample lines and the valve on the first drain line Door, the liquid making the second sample point flow out is discharged a period of time, is closed the valve on the first drain line, open the second excretion Valve on pipeline, stands certain time, observes gas-liquid separation bottle side scale, and record generates certain volume gas institute's used time Between, the reading of record temperature sensor, open collection and confinement of gases valve, collect gaseous sample, gaseous sample is numbered, close second Valve in sample lines and the valve on the second excretory duct, open the valve on feed pipe, refills gas-liquid with liquid and divides From device and gas pressure balancing bottle, making the hydraulically full rear top of gas-liquid separator not interspace, close feed pipe valve, second adopts Sampling point sampling is complete；

When gathering the sample of the 3rd sample point, open the valve in the 3rd sample lines and the valve on the first drain line Door, the liquid making the 3rd sample point flow out is discharged a period of time, is closed the valve on the first drain line, open the second excretion Valve on pipeline, stands certain time, observes gas-liquid separation bottle side scale, and record generates certain volume gas institute's used time Between, the reading of record temperature sensor, open collection and confinement of gases valve, collect gaseous sample, gaseous sample is numbered, close the 3rd Valve in sample lines and the valve on the second excretory duct, open the valve on feed pipe, refills gas-liquid with liquid and divides From device and gas pressure balancing bottle, making the hydraulically full rear top of gas-liquid separator not interspace, close feed pipe valve, the 3rd adopts Sampling point sampling is complete；

When gathering the sample of the 4th sample point, open the valve in the 4th sample lines and the valve on the first drain line Door, the liquid making the 4th sample point flow out is discharged a period of time, is closed the valve on the first drain line, open the second excretion Valve on pipeline, stands certain time, observes gas-liquid separation bottle side scale, and record generates certain volume gas institute's used time Between, the reading of record temperature sensor, open collection and confinement of gases valve, collect gaseous sample, gaseous sample is numbered, close the 4th Valve in sample lines and the valve on the second excretory duct, open the valve on feed pipe, refills gas-liquid with liquid and divides From device and gas pressure balancing bottle, making the hydraulically full rear top of gas-liquid separator not interspace, close feed pipe valve, the 4th adopts Sampling point sampling is complete.

Described experimental technique, preferably: simulation experiment step also includes step 7): change experiment condition, including filling The porosu solid medium granularity of sample, porosity, confession one of gas medium, liquid medium, hydraulic pressure, water velocity, temperature or its group Close, the most empirically step 1)～6) test.

Described experimental technique, preferably: the step 2 in simulation experiment step) specifically:

Open vacuum pump valve and vacuum pump, close after reservoir simulation systems stay evacuation 6～more than 8 hours, so Rear standing 3～more than 5 hours, check the first air gauge in the first sample lines～the 4th sample lines～the 4th barometric Reading, checks that all air gauge readings are the most stable, unstable, continues evacuation, reexamines, the most repeatedly, until air pressure Meter reading is stable, enters and tests next step.

Described experimental technique, preferably: the step 3 in simulation experiment step) specifically:

High-pressure air feed source is changed to high pressure gas cylinder to be measured, opens the pressure valve on main supply air line, open the first supply Air-supplying valve on branch road and the second supply branch road, regulates air relief valve, sets supply gas pressure P；Simulation to reservoir simulation system Pipe is filled with coal bed gas, persistently injects the scheduled time, close the pressure valve on main supply air line, stand a period of time, continuously Observe all air gauge readings, such as stable reading, enter next step；If any one air gauge reading declines, reopen Pressure valve on main supply air line, continues to be filled with coal bed gas to the simulation pipe of reservoir simulation system, the most repeatedly, until all Air gauge stable reading, closes the pressure valve on main supply air line, enters and tests next step, records gas mass flow simultaneously Meter and all air gauge registration values, determine that system gas to be measured adds up the supply gas pressure after being filled with quality and balance.

Described experimental technique, preferably:

Before experiment, each step in preparation process is specifically:

1) according to stratum prototype section, divide section section length and the gradient, determine profile type: extract and characterize section spy Main gradient type, length and the syntagmatic levied, determines each main gradient Type Length；

2) calculating simulation pipeline segmentation length, simulation pipeline spacing and syntagmatic: determine simulation geometric similarity ratio, by mould The segmentation intending the geometric similarity simulation pipeline more corresponding than determining reservoir simulation system is determined by formula (1)～(3):

S=l_i/l_{Former i}=L_i/L_{Former i}=b/B_Former (1)

sinα_i=h_i/l_i (2)

sinβ_i=H_j/L_j (3)

In formula: s is the geometric similarity ratio of model and prototype；

l_{Former i}、L_{Former i}It is respectively prototype basin supply side and the section length of excretion side；

b、B_FormerIt is respectively synclinal basin model and the nearly horizontal section length in prototype core portion；

α_i、β_iIt is respectively the grading pitch statistics median of prototype basin supply side and excretion side；

h_i、l_iIt is respectively supply side, basin and determines simulation pipeline spacing and section length by the likelihood ratio；

H_j、L_jFor representing simulation pipeline spacing and the section length that excretion side, basin is determined by the likelihood ratio；

I, j are natural number, represent basin supply side form respectively and intend pipeline and the segments of basin excretion side form plan pipeline；

3) make section simulation pipeline and connect simulation pipeline: the corresponding length that completes and the first simulation pipeline of the gradient ～the 3rd after step simulation pipeline, according to profile type syntagmatic, connect simulation pipeline, be separately fixed at two the most solid Determining on frame and a horizontal fixed mount, wherein the first simulation pipeline and the second simulation pipeline are separately fixed at two vertical fixed mounts On, the 3rd simulation pipeline is fixed on a horizontal fixed mount, the two ends of horizontal fixed mount fixed mount vertical with two respectively Bottom connects, and after being combined with slinging beam by two vertical fixed mounts, is suspended on boom hoisting by slinging beam, the most successively Reservoir simulation system is connected with other system；

4) debugging sample collection system and gas-liquid recovery system: open the valve on feed pipe, by sample collection system gas Filling water in the container of liquid/gas separator and gas pressure balancing bottle, after gas-liquid separator water-filling, top does not interspaces, and closes and supplies water Tube valve；In the gas-liquid separator of gas-liquid recovery system, it is prefilled with water, or dress water height at least floods the first excretory duct pipe End；

5) airtight test: first select nitrogen in high-pressure air feed source, open air-supplying valve, regulate air relief valve, set Pressure in reservoir simulation system simulation pipeline is test pressure W, and (test pressure W=(1.5～2) p, system pressure p are by prototype Basin reservoir hydrostatic pressure p=γ h, wherein γ is the severe of water, receives reservoir buried depth), check the sealing of device；

6) simulation pipeline dress sample: simulation pipeline is lifted to more than the liquid level of calorstat by boom hoisting, selects to make in advance The coal petrography sample got ready, sublevel fill stoping first simulates pipeline, the second simulation pipeline and the 3rd simulation pipeline, filling complete coal petrography sample After, reconnect simulation pipe interface and connecting line, it is ensured that seal intact, then by boom hoisting first simulate pipeline～ 3rd simulation pipeline is fully immersed in below the liquid level of couveuse, starts simulation experiment.

Described experimental technique, it is characterised in that: the step 3 in preparation process before experiment) in successively reservoir simulation System is connected with other system and includes:

First simulation pipeline upper end connects water system after connecting feed pipe, and this pipeline upper end is simultaneously as the 4th sampled point It is connected by the 4th sample lines with the 4th inlet side mouth of adapter；Second simulation pipeline upper end as the first sampled point be connected First inlet side mouth of device is connected by the first sample lines；First simulation pipeline and the 3rd simulation line connection are adopted as the 3rd Sampling point draws tap line, and this tap line is divided into two again, respectively with the 3rd inlet side mouth and the saturated and evacuation of adapter System connects；Second simulation pipeline and the 3rd simulation line connection as the second sampled point and draw tap line, this branch line Pipeline is divided into two again, respectively with the second inlet side mouth of adapter and saturated be connected with pumped vacuum systems；Adapter go out port Gas-liquid recovery system and sample collection system is connected by excretory duct.

Described experimental technique, preferably: after simulation experiment step, also include sample test and data analysis step, should Sample test and data analysis step include:

The sample gathered is carried out component test and isotope test, the sample component in research different sampling interval and coordination Element change, analyzes the Groundwater Flow impact on reservoir gas isotope fractionation.

A kind of Water Soluble Gas experimental technique on the impact of reservoir Unconventional forage isotope fractionation of simulating, the method uses As above one of described storage synclinal structure basin Water Soluble Gas transported simulation device of being certainly conigenous is tested, wherein this experimental technique bag Including simulation experiment step, this simulation experiment step includes:

1) before starting experiment, by all valve closings of analog；

3) open the pressure valve of high pressure gas cylinder to be measured, regulate air relief valve, set supply gas pressure P (supply gas pressure P=(1.2 ～1.5) p, p be prototype basin reservoir hydrostatic pressure, p=γ h, wherein γ is the severe of water, and h is reservoir buried depth), persistently supply Until whole air gauge stable reading, closing presure valve, enter next step；Record mass-flow gas meter and air gauge simultaneously Numerical value；

4) open water supply valve, regulate constant pressure valve, open feed pump, feed pump with the level of slightly above system pressure p to Stablizing water filling in the simulation pipeline of reservoir simulation system, the liquid in the first excretory duct arrives gas-liquid separator, in gas-liquid separation Realizing gas-liquid separation in device, gas is discharged by the valve on gas withdrawal line, returnable collect, and liquid flows through overflow Room, is collected by liquid collection receptacle；

Described experimental technique, preferably: the step 3 in simulation experiment step) including: according to test requirements document, determine and adopt Sample time interval, gathers the first sampled point～the gas sample of the 4th sample point the most successively, wherein,

Described experimental technique, preferred simulation experiment step also includes step 7): change experiment condition, such as reservoir samples Physical parameter (including ature of coal, granular size, porosity etc.), for gas medium (pure methane gas), liquid medium (take ion Water, pure water), water supply pressure, water supply flow, the condition such as temperature, the most empirically step 1)～6) carry out.

Described experimental technique, also includes testing front preparation process before preferred simulation experiment step, prepares before this experiment Step includes:

1) according to stratum prototype section, divide section section length and the gradient, determine profile type；

2) reference section simulation pipeline segmentation length, simulation pipeline spacing and syntagmatic；

3) make simulation pipeline and connect simulation pipeline；

4) debugging sample collection system and gas-liquid recovery system；

5) airtight test；

6) simulation pipeline dress sample.

Described experimental technique, preferably:

Before experiment, each step in preparation process is specifically:

2) calculating simulation pipeline segmentation length, simulation pipeline spacing and syntagmatic: determine simulation geometric similarity ratio, by mould Intend the grading pitch of the geometric similarity simulation pipeline more corresponding than determining reservoir simulation system, formula (1)～(3) determine simulation Length of pipe and section length and simulation pipeline spacing, concrete calculating is determined by formula (1)～(3):

S=l_i/l_{Former i}=L_i/L_{Former i}=b/B_Former (1)

sinα_i=h_i/l_i (2)

sinβ_i=H_j/L_j (3)

In formula: s is the geometric similarity ratio of model and prototype；

1_{Former i}、L_{Former i}It is respectively prototype basin supply side and the section length of excretion side；

4) debugging sample collection system and gas-liquid recovery system: open the valve on feed pipe, by sample collection system gas Filling water in the container of liquid/gas separator and gas pressure balancing bottle, after liquid/gas separator water-filling, top does not interspaces, and closes feed pipe Valve；In the gas-liquid separator of gas-liquid recovery system, it is prefilled with water, or dress water height at least floods the first excretory duct pipe end；

5) airtight test: first select nitrogen in high-pressure air feed source, open air-supplying valve, regulate air relief valve, set Pressure in reservoir simulation system simulation pipeline is test pressure W, and (test pressure W=(1.5～2) p, system pressure p are by prototype Basin reservoir hydrostatic pressure p=γ h, wherein γ is the severe of water, and h is reservoir buried depth), check the sealing of device；

Described experimental technique, it is characterised in that: experiment before preparation process 3) in successively reservoir simulation system and its His system connects and includes:

First simulation pipeline upper end connects water system after connecting feed pipe, and this pipeline upper end is simultaneously as the 4th sampled point It is connected by the 4th sample lines with the 4th inlet side mouth of adapter；Second simulation pipeline upper end as the first sampled point be connected First inlet side mouth of device is connected by the first sample lines；First simulation pipeline and the 3rd simulation line connection are adopted as the 3rd Sampling point draws tap line, and this tap line is connected with the 3rd inlet side mouth of adapter；Second simulation pipeline and the 3rd simulation pipe Junction, road is as the second sampled point and draws tap line, and this tap line is connected with the second inlet side mouth of adapter；Connect The port that goes out of device connects gas-liquid recovery system and sample collection system by excretory duct, after pipeline has connected, in the first simulation The original gassiness coal petrography sample not having desorbing coal bed gas that in pipeline～tertiary membrane and pipeline, filling is fresh, new gather original contain It is directly loadable into the simulation pipeline of reservoir simulation system after bottle coal rock sample product quick crashing, enters next step.

Described experimental technique, also includes sample test and data analysis step after preferred simulation experiment step, this sample Product test and data analysis step include:

Sample test and data analysis: the sample gathered is carried out component test and isotope test, research difference sampling The sample component at interval and isotope change, the Study of The Underground water flowing impact on reservoir gas isotope fractionation.

Accompanying drawing explanation

Fig. 1 is Unconventional forage (coal bed gas/shale gas) synclinal structure basin shape and groundwater flow schematic diagram；

Fig. 2 is for from being conigenous storage synclinal structure basin Water Soluble Gas transported simulation device schematic diagram；

Fig. 3 is reservoir simulation system top view；

Fig. 4 is gas-liquid separator enlarged drawing；

Fig. 5 is fixed mount forward sight enlarged drawing；

Fig. 6 is fixed mount top perspective view.

In figure, 1 is simulation pipeline；2 is simulation pipeline；3 is simulation pipeline；4 is calorstat and control system；5 is vacuum Pump；6 is valve；7 is high-pressure air feed source；8 is valve；9 is air relief valve；10 is threeway；11 is air gauge；12 is quality of filling gas stream Gauge；13 is constant pressure and flow feed pump；14 is water pressure gauge；15 is valve；16 (1) and 16 (2) is valve；17 is storage tank；18 For fixed mount；18 (1) is horizontal support；18 (2) is location pipe clamp；19 (1)～19 (4) is air gauge；20 is constant pressure valve；21 are Temperature sensor；22 is slinging beam；23 is fixed mount；23 (1) is vertical supporting；23 (2) is location pipe clamp；23 (3) is ring To support；23 (4) is horizontal internal stay；24 is valve；25 (1)～25 (4) is flexible pipe；26 (1) is the first excretory duct；26 (2) are Second excretory duct；27 is gas-liquid separator；28 is gas pressure balancing bottle；29 is spout hole；30 is gas-collecting pipe；31 is valve Door；32 is rubber tube；33 is valve；34 (1)～34 (4) is sampled point；35 (1)～35 (4) is valve；36 is adapter；36 ～36 (4) be inlet side mouth (1)；36 (e) is for going out port；37 is temperature sensor；38 is gas-liquid separator；38 (1) is that gas-liquid is divided From room；38 (2) is overflow chamber；38 (3) is median septum；39 is gas returnable；40 is liquid collection receptacle；41 (1) and 41 (2) being valve, 42 is scale.

Detailed description of the invention

Include as in figure 2 it is shown, be certainly conigenous storage synclinal structure basin Water Soluble Gas transported simulation device: reservoir simulation system, confession Water system, gas-liquid recovery system, sample collection system, saturated with pumped vacuum systems, lifting control system, thermostatic control system, Connecting line system (includes adapter and a plurality of connecting line being connected with each system).

Thermostatic control system includes calorstat 4 and temperature sensor 21, fills liquid in calorstat 4, such as water, kerosene etc., Reservoir simulating device is immersed in the liquid in calorstat 4.The effect of this thermostatic control system is to ensure that in process of the test required Steady temperature field, temperature sensor 21 one end stretches in calorstat 4 monitoring temperature of liquid, and the other end includes temperature display dress Put, be arranged on outside calorstat, be used for showing temperature of liquid.

Reservoir simulation system includes 3 hollow simulation pipelines, is respectively simulation pipeline 1, simulation pipeline 2 and simulation pipeline 3. Simulation pipeline 1 is used for simulating place, supply side, basin synclinal limb, and simulation pipeline 2 is used for simulating place, excretion side, basin synclinal limb, Simulation pipeline 3 is used for simulating the nearly horizontal segment of basin core.Simulation pipeline 1 and simulation pipeline 2 coil bending ringwise, its segmentation Length is determined by geometric similarity ratio, and grading pitch determines according to prototype section statistics median, and the change of grading pitch is by changing Become pipeline spacing h of simulation annulus line_iOr H_jRealize (i, j are natural number).Simulation pipeline 3 is horizontal serpentine bend, its length Determined by geometric similarity ratio.Calculate parameter to be determined by formula (1)～(3):

S=l_i/l_{Former i}=L_i/L_{Former i}=b/B_Former (1)

sinα_i=h_i/l_i (2)

sinβ_i=H_j/L_j (3)

In formula: s is the geometric similarity ratio of model and prototype；

h_i、l_iIt is respectively supply side, basin and determines simulation pipeline segmentation spacing and section length by the likelihood ratio；

H_j、L_jIt is respectively simulation pipeline segmentation spacing and section length that excretion side, basin is determined by the likelihood ratio.

Simulation pipeline 1 and simulation pipeline 2 lower end are interconnected by simulation pipeline 3, and simulation pipeline 1 upper end connects for water system System, simulation pipeline 2 upper end connects gas-liquid recovery system, and the upper end of simulation pipeline 1 and simulation pipeline 2 is respectively arranged the 4th sampled point 34 (4) and first sampled point 34 (1), the first sampled point 34 (1) and the 4th sampled point 34 (4) connect sample collection system respectively. Reservoir simulation system the most also need to arrange sampled point in following two place: the 3rd sampled point 34 (3) is simulation pipeline 1 and simulation The junction of pipeline 3, the second sampled point 34 (2) is the junction of simulation pipeline 2 and simulation pipeline 3, from sampled point 34 (2) and 34 (3) being respectively provided with threeway and draw tap line, tap line is divided into two again, respectively with sample collection system and saturated with take out true Do-nothing system connects.According to research needs, the most also sampling tube can be set at the slope change of simulation pipeline 1 and simulation pipeline 2 Road, draws tap line, is connected with sample collection system respectively.

As shown in Fig. 2,3,5,6, lift by crane control system include that the vertical fixed mount of slinging beam 22, two 23 (includes vertical Support 23 (1), location pipe clamp 23 (2), hoop support 23 (3), horizontal internal stay 23 (4)), horizontal fixed mount 18 (include horizontal support 18 (1) and location pipe clamp 18 (2)) and boom hoisting.Two fixed mounts 23 are basically perpendicular to horizontal fixed mount 18 ground and arrange, fixing The structural form of frame 23 is bottom and top is respectively equipped with hoop and supports 23 (3), and upper and lower hoop supports 23 (3) planes and respectively arranges vertical Straight two horizontal braces 23 (4) intersected, upper and lower two horizontal internal stay are parallel to each other two-by-two, upper and lower horizontal internal stay 23 (4) and ring To supporting 23 (3) intersections, arranging the vertical supporting 23 (1) of four vertical hoop supporting planes, vertical supporting 23 (1) is installed can The location pipe clamp 23 (2) moved up and down, is respectively used to fixed-analog pipeline 1 and simulation pipeline 2 and sampled point draws arm；Gu Determining frame 18 is two parallel horizontal supports 18 (1), and horizontal support 18 (1) two ends support 23 with the bottom surface hoop of fixed mount 23 (3) and horizontal internal stay 23 (4) is fixing connects, horizontal support 18 (1) arranges location pipe clamp 18 (2), for fixed-analog pipeline 3.Above-mentioned horizontal support 18 (1), horizontal internal stay 23 (4) and vertical supporting 23 (1) can be support bar, hollow support post, material Material is the metal such as ferrum, steel, and it can be solid or hollow ring that upper and lower hoop supports 23 (3)；Horizontal support, vertical supporting, hoop Support from each other be connected by welding or the mode such as bolt connection.Two fixed mounts 23 are suspended on slinging beam 22 times respectively The position of both sides, face, fixed mount 18 is in the setting that the bottom of two fixed mounts 23 is basic horizontal, and two ends are solid with these two respectively Determining frame 23 to be connected, slinging beam 22, fixed mount 23 and fixed mount 18 constitute a complete fixing device, hang on boom hoisting Under, reservoir simulation system can be made to sink to below the liquid level of couveuse 4 and be lifted to the liquid of couveuse 4 by controlling boom hoisting On face.

Being filled with sample in simulation pipeline 1, simulation pipeline 2 and the simulation pipeline 3 of reservoir simulation system, sample is porous Containing gas medium, contained gas can be pure methane gas, coal bed gas, natural gas, shale gas etc., and gas saturation reaches more than 85%, Medium can be coal petrography sample, shale, mud stone, activated carbon etc., does not needs pretreatment containing gas medium, by saturated and pumped vacuum systems pair Filling sample carries out evacuation, then sample carries out saturated inflation process so that it is gas saturation reaches more than 85%.Above-mentioned mould After intending pipeline connection, it is fixed on lifting control system fixed mount, boom hoisting puts into the constant temperature in temperature control system In case, water system supply water, provide one for filling sample in reservoir simulation system pipeline and stablize hydrostatic field and steady seepage Current, are kept stable temperature field by thermostatic control system simultaneously.Current flow through reservoir simulation system, during flowing, Gas contained by sample (gas can be pure methane, coal bed gas, shale gas etc.) is dissolved in water and forms Water Soluble Gas, a part of Water Soluble Gas Along with water flows, gas is brought to pipeline elsewhere, is exchanged with adsorption by desorbing with coal petrography sample adsorption gas, A part is carried over reservoir simulation system, enters gas-liquid recovery system, and gas scatters and disappears, thus breaks original the containing of coal petrography sample Gas sexual balance, such that it is able to realize simulation hyposmosis from being conigenous storage Unconventional forage (such as coal bed gas/shale gas) synclinal structure Water Soluble Gas migration rule and Water Soluble Gas isotope fractionation rule in basin solid, liquid and gas three-phase blending agent.Simulation pipeline Material can be selected for high pressure resistant, high temperature, airtight character material, such as glass tubing, steel pipe, copper pipe etc., hollow channel interior need to be passivated place Reason.

Water system includes constant voltage constant speed feed pump 13, water pressure gauge 14, water supply valve 15, constant pressure valve 20 and storage tank 17. Water system is connected by flexible pipe 25 (4) with the simulation pipeline 1 upper end sampled point 34 (4) of reservoir simulation system.Flexible pipe 25 (4) with Arranging water supply valve 15 and water pressure gauge 14 between constant voltage constant speed feed pump 13, storage tank 17 is constant voltage constant speed feed pump by pipeline 13 provide water source, and constant pressure valve 20 is arranged on the connecting line between inlet side mouth 36 (1) and sampled point 34 (1).Supply water according to mould The purpose of draft experiment may select basin formation water, deionized water or pure water etc..By regulation feed pump 13 pressure and constant pressure valve 20 can realize the sample stable water supply that water system is reservoir simulation system, simultaneously for reservoir simulation system provide one constant The hydraulic pressure field of force and stationary flow, test flow is 0.05～1m³/ min, pressure of supply water presses prototype basin reservoir hydrostatic pressure p= γ h (γ is the severe of water, and h is reservoir buried depth) determines.

Gas-liquid recovery system includes air gauge 19 (1), flexible pipe the 25 (1), first excretory duct 26 (1), valve 31, valve 35 (1), gas-liquid separator 38 (including gas-liquid separation chamber 38 (1), overflow chamber 38 (2) and median septum 38 (3)), gas returnable 39, liquid collection receptacle 40 and liquids recovery valve 41 (1).Gas-liquid separator 38 is an appearance with vertical median septum 38 (3) Device, median septum 38 (3) is vertically divided into two container from the top down, is divided into gas-liquid separation chamber 38 (1) and overflow chamber 38 (2), in Dividing plate 38 (3) in addition to its base is not connected with container bottom inwall, the top of median septum 38 (3), dual-side respectively with appearance Device top inner wall, side interior wall airtight connection, median septum 38 (3) end along with container bottom very close to, i.e. distance container bottom Distance is the least, and slot-shaped in one, therefore container bottom is not closed and both sides can be made to connect.Overflow chamber 38 (2) opens 1 hole in top, with Liquid collection receptacle 40 is by hose connection.Gas-liquid separation chamber 38 (1) opens 2 holes in top, and gas withdrawal line and gas are passed through in a hole Body returnable 39 connects, and gas withdrawal line has valve 31, and another hole is gone out with adapter 36 by the first excretory duct 26 (1) Port 36 (e) connects, and the first excretory duct 26 (1) is provided with liquids recovery valve 41 (1), and the first excretory duct 26 (1) pipe end is inserted It is not more than the container height of 1/2 in gas-liquid separation chamber 38 (1) middle-range container bottom, and the distance away from container bottom is not less than 2～3 times Median septum at the bottom of along to the height of container bottom.First excretory duct 26 (1) goes out port 36 (e) even by pipeline and adapter 36 Connect, then through adapter 36, inlet side mouth 36 (1) be connected with flexible pipe 25 (1) by connecting line, then by flexible pipe 25 (1) and storage The sampled point 34 (1) of simulation pipeline 2 upper end of layer analog systems connects, the connection between inlet side mouth 36 (1) and sampled point 34 (1) Pipeline is sequentially installed with valve 35 (1), Pressure gauge 19 (1) and constant pressure valve 20.Gas-liquid recovery system can collect reservoir simulation system System effluent air and liquid, make analog systems constitute complete cycle.

Adapter 36 is to have multiple inlet sides mouth and a pipeline connecting device going out port 36 (e), the of adapter 36 One inlet side mouth～the 4th inlet side mouth 36 (1)～36 (4) connect flexible pipe 25 by the first sample lines～the 4th sample lines respectively (1)～25 (4), flexible pipe 25 (1)～25 (4) is again with simulation pipeline the first sampled point～the 4th sampled point 34 (1)～34 (4) even Connect, for gathering the sample of each sampled point, each pipeline is respectively equipped with valve 35 (1)～35 (4), its middle port 36 (1) And the connecting line between sampled point 34 (1) is simultaneously as the connecting line of gas-liquid recovery system.Adapter 36 go out port 36 E () connects gas-liquid recovery system and sample collection system, wherein the first excretory duct 26 (1) and gas by the first excretory duct 26 (1) Liquid recovery system is connected, and pipeline arranges sample and reclaims valve 41 (1)；The port 36 (e) of adapter 36 is also by the second excretion Pipe 26 (2) is connected with sample collection system, and pipeline arranges sample collecting valve 41 (2).The inlet side mouth of adapter 36 can expand Filling, number matches with reservoir simulation systematic sampling point.

Sample collection system includes sample collecting pipeline gentle liquid separating apparatus two parts, and sample collecting pipeline is adapter Connecting line between inlet side mouth 36 (1)～36 (4) and the simulation pipeline sampled point 34 (1)～34 (4) of 36, on every pipeline all Air gauge 19 and valve 35 are set.Sampled point 34 (i) that sample collecting pipeline is arranged according to reservoir simulation system (i is natural number, =1,2 ...) number and position configure corresponding sample lines, for gathering the gas-liquid mixed of reservoir simulation system different parts Sample, the pipeline of different sampled points is collected to adapter 36, and (i, i are natural number, with sampled point with the inlet side mouth 36 of adapter 36 Quantity identical) connect, then by adapter 36 go out port 36 (e) by second drain line 26 (2) connect gas-liquid separation Device.On inlet side mouth 36 (i) of adapter 36, pipeline, the component such as air gauge 19 (i), valve 35 (i) is all according to sampled point 34 (i) Quantity and method for numbering serial are arranged, and name according to " component name+(numbering) ", and component as corresponding in sampled point 34 (1) is inlet side mouth 36 (1), air gauge 19 (1), valve 35 (1), other the like, and be sequentially connected with respective line.

Gas-liquid separation device includes valve the 24, second excretory duct 26 (2), gas-liquid separator 27, gas pressure balancing bottle 28 (in this gas pressure balancing bottle 28 upper portion side wall, being provided with liquid overflow holes 29), gas-collecting pipe 30, rubber tube 32, valve 33 With temperature sensor 37.As shown in Figure 4, gas-liquid separator 27 is the airtight transparent vessel of bottom sides and end face perforate, and side Face mark picture scale 42.Gas-collecting pipe 30 is installed in a hole in top drilling, and gas-collecting pipe 30 is provided with collection and confinement of gases Valve 33, gas-collecting pipe 30 pipe end flushes with container top；The second excretory duct 26 (2), the second excretory duct 26 are inserted in another hole (2) away from being not more than at the bottom of bottle at 1/3 height of gas-liquid separator 27 under liquid level during pipe end inserts in gas-liquid separator 27 deeply；3rd hole Mounting temperature sensor 37, all perforated walls and intubate between (or temperature sensor) outer wall seal.Gas pressure balancing bottle 28 For the transparent open-top receptacle in side opening 2 hole, a hole is near top, for spout hole 29, edge height and gas-liquid under spout hole 29 perforate Separator 27 top flushes；Another hole is near container bottom, position of opening and gas-liquid separator 27 bottom sides perforate height phase With, this another hole is connected by rubber tube 32 with gas trap 27 bottom sides perforate.Gas pressure balancing bottle 28 is uncovered, its Interior placement feed pipe, the feed pipe other end connects storage tank 17, feed pipe arranges valve 24.During work, gas-liquid separator 27 With gas pressure balancing bottle 28 fills water, height of water level be spout hole 29 times along position, gas-liquid separator 27 top is not Interspace.This sample collection system function can realize entering the gas-liquid mixed sample of each sampled point collection of reservoir simulation system Row gas-liquid separation, prepares gaseous sample, provides test specimen for follow-up test.

Saturated and pumped vacuum systems includes vacuum pump 5, vacuum pump valve 6, high-pressure air feed source 7, pressure valve 8, air relief valve 9, threeway 10, air gauge 11, quality of filling gas effusion meter 12 and connecting line thereof.Saturated with pumped vacuum systems with sampled point 34 (2) Being connected by supply air line with sampled point 34 (3), sampled point 34 (2) is simulation pipeline 2 and simulation pipeline 3 junction, sampled point 34 (3) is the junction of simulation pipeline 1 and simulation pipeline 3, and is respectively provided with air-supplying valve 16 (1) and 16 on supply air line (2).High-pressure air feed source 7 can provide pure nitrogen, pure methane gas or the storage of simulation basin respectively according to supply needs Layer gas, such as coal bed gas, shale gas and pure methane.Set on main supply air line between threeway 10 first end and high-pressure air feed source 7 Put pressure valve 8, air relief valve 9, air gauge 11 and quality of filling gas effusion meter 12；Threeway 10 second end passes through exhaust pipe and vacuum Pump 6 connects, and this exhaust pipe is provided with vacuum pump valve 6；One end of threeway 10 three-terminal link supply air line, this supply air line The other end separates two supply branch roads, and every branch road is connected with sampled point 34 (2) and sampled point 34 (3) respectively, the first supply It is respectively arranged with the first air-supplying valve 16 (1) and the second air-supplying valve 16 (2) on road and the second supply branch road.This is saturated and takes out true Do-nothing system can in reservoir simulation system filling without gas sample product evacuation, then set supply gas pressure P sample is carried out Saturated inflation processes, and prepares high pressure gassiness sample, and sample gas saturation reaches more than 85%, and simulation is from being conigenous storage gassiness storage Layer, reduction original uniform gas-bearing reservoir.

Reservoir simulation system and water system, gas-liquid recovery system, sample collection system and saturated adopt with pumped vacuum systems Flexibly connect with flexible pipe 25 (i, i are natural number, i=1,2,3,4), reservoir simulation system can be made to facilitate lifting and reduction, be beneficial to In test front simulation pipeline, sample is installed, and controls analog temperature in test, and in simulating pipeline after test, sample takes out.Flexible pipe 25 I () is high temperature resistant, high-pressure elastomeric flexible pipe, material can be selected for rustless steel or rubber etc..

One, two to utilizing the present invention's to be certainly conigenous storage synclinal structure basin Water Soluble Gas transported simulation dress by the following examples Put the Water Soluble Gas carried out the experimental technique that affects of reservoir Unconventional forage (such as coal bed gas) isotope fractionation is illustrated:

Embodiment one:

As in figure 2 it is shown, the present invention includes reservoir simulation system from being conigenous storage synclinal structure basin Water Soluble Gas transported simulation device System, water system, gas-liquid recovery system, sample collection system, saturated and pumped vacuum systems, lifting control system, thermostatic control System and relevant connection pipeline.This analogue experiment method is divided into preparation, simulation experiment and sampling analysis before experiment.

One, prepare before experiment

1) according to gas storage synclinal structure Basin Prototype section, section gassiness is divided from being conigenous storage reservoir section length and slope Degree, determines profile type.By prototype synclinal basin, determine basin reservoir section, according to reservoir section gradient feature, extract and characterize Main gradient type, length and the syntagmatic of reservoir profile features, gradient type is divided by following gradient principle of classification: nearly water Flat section (α≤5 °), low-angle dip section (5 ° of ＜ α≤15 °), tilting section (15 ° of ＜ α≤35 °), high-dipping section (α ＞ 35 °).To oblique two The wing respectively divides less than 3 main gradient types, determines section gradient type main combination relation, such as slow-urgency of inclining-tilt Inclining or slow incline the--various combination relation such as inclination of anxious inclining, the different location identical persons of the gradient, its length does not affect profile type combination The secondary gradient section of relation, can be included into decision profile type main length gradient section, it is then determined that each main gradient Type Length.

2) calculating simulation pipeline segmentation length, simulation pipeline segmentation spacing and syntagmatic.Determine simulation geometric similarity ratio, Reservoir simulation system corresponding simulation pipeline 1, simulation pipeline 2 and the total length of simulation pipeline 3 is determined by simulation geometric similarity ratio And section length, simulation pipeline 1 and the grading pitch of simulation pipeline 2, divide and after statistics according to gradient principle of classification, by prototype Basin each grading pitch statistics median determines, formula (1)～(3) determine between simulation length of pipe and simulation pipeline segmentation Away from:

S=l_i/l_{Former i}=L_i/L_{Former i}=b/B_Former (1)

sinα_i=h_i/l_i (2)

sinβ_i=H_j/L_j (3)

In formula: s is the geometric similarity ratio of model and prototype；

H_j、L_jFor representing simulation pipeline segmentation spacing and the section length that excretion side, basin is determined by the likelihood ratio.

I, j are natural number, represent basin supply side form respectively and intend pipeline and the segments of basin excretion side form plan pipeline.

3) section simulation pipeline, connection system pipeline are made.Complete corresponding length and the simulation pipeline 1 of the gradient, mould After plan pipeline 2 and simulation pipeline 3, according to profile type syntagmatic, connect simulation pipeline, be separately fixed at two vertically On fixed mount 23 and a horizontal fixed mount 18, wherein simulation pipeline 1, simulation pipeline 2 are separately fixed at two vertical fixed mounts On 23, and according to sublevel interval, adjusting pipe clamp 23 (2) position and fix piecemeal, simulation pipeline 3 is fixed on horizontal fixed mount 18 On pipe clamp 18 (2), horizontal fixed mount 18 bottom with two vertical fixed mounts 23 respectively is connected, by two vertical fixed mounts 23 with After slinging beam 22 combination, slinging beam 22 is suspended on boom hoisting, reservoir simulation system with other is the most successively System connects.

Reservoir simulation system connected mode is: simulation pipeline 1 upper end connects flexible pipe 25 (4) and connects water system afterwards, this pipe Upper end, road is connected by sample lines with inlet side mouth 36 (4) simultaneously as sampled point 34 (4)；Simulation pipeline 2 upper end connects flexible pipe 25 (1) connect with gas-liquid recovery system afterwards, and this pipeline upper end passes through sampling simultaneously as sampled point 34 (1) with inlet side mouth 36 (1) Pipeline connects；Simulation pipeline 1 and simulation pipeline 3 junction extraction arm are as sampled point 34 (3), and this tap line is further divided into Two, respectively with inlet side mouth 36 (3) and saturated be connected with pumped vacuum systems；Simulation pipeline 2 draws arm with simulation pipeline 3 junction As sampled point 34 (2), this tap line is divided into two again, respectively with inlet side mouth 36 (2) and saturated be connected with pumped vacuum systems. Sampled point 34 (1)～34 (4) collects the inlet side mouth 36 (1)～34 (4) being connected to adapter 36 by sample lines, then by connecting The port 36 (e) that goes out of device 36 connects gas-liquid recovery system and sample collection system.

Reservoir simulation system, water system, gas-liquid recovery system, sample collection system and saturated own with pumped vacuum systems After pipeline connects, lifting control system the simulation pipeline of reservoir simulation system is placed on the calorstat of thermostatic control system Below the liquid level of 4, meanwhile, set the temperature of thermostatic control system, temperature of liquid in calorstat is heated to design temperature. The on-test all valves of front simulation device are closed.

4) debugging sample collection system and gas-liquid recovery system.Open valve 24, by sample collection system gas-liquid separator 27 and gas pressure balancing bottle 28 container in fill water, height of water level be spout hole 29 times along position, gas-liquid separator After 27 water-fillings, top does not interspaces, and closes valve 24.It is prefilled with water in the gas-liquid separator 38 (1) of gas-liquid recovery system, Or dress water height at least floods the first excretory duct 26 (1) pipe end.

5) airtight test.First in high-pressure air feed source 7, select nitrogen, open air-supplying valve 8, regulate air relief valve 9, if The pressure determined in reservoir simulation system simulation pipeline is test pressure W, and (test pressure W=(1.5～2.0) p, p are prototype basin Reservoir hydrostatic pressure, p=γ h, wherein γ is the severe of water, receives reservoir buried depth), check the sealing of whole device pipeline.

6) simulation pipeline dress sample.The pipe-line system that sealing is intact, by boom hoisting simulation pipeline 1～simulation pipeline 3 Be lifted to more than the liquid level of calorstat 4, select fresh, moisture-free coal rock sample product well prepared in advance, described coal petrography sample need through Fully desorbing, does not contains residual gas, and coal petrography sample particle diameter is the 1/5～1/10 of simulation tubing internal diameter, the coal petrography sample after broken Product sublevel fill stoping simulation pipeline 1, simulation pipeline 2 and simulation pipeline 3, after the complete coal sample of filling, reconnect simulation pipe interface and Connecting line, it is ensured that seal intact, is then fully immersed in couveuse 4 by boom hoisting simulation pipeline 1～simulation pipeline 3 Below liquid level, experiment starts.

Two, simulation experiment

Simulation experiment follows the steps below:

1), before system starts test, all valves of system are closed；

2) open vacuum pump valve 6, air-supplying valve 16 (1) and 16 (2) and vacuum pump 5, reservoir simulation systems stay is taken out Close vacuum pump 5, valve 6, air-supplying valve 16 (1) and 16 (2) after vacuum 6～more than 8h, then stand more than 3～5 hours, inspection Look into air gauge 19 (1)～19 (4) reading, check that all air gauge readings are the most stable, unstable, in reservoir simulation system is described There is residual gas in dress sample, then proceedes to evacuation, reexamine, and the most repeatedly, until air gauge stable reading, enters real Test next step；

3) high-pressure air feed source 7 is changed to high pressure gas cylinder to be measured, such as coal bed gas, opens the valve 8 on main supply air line, supply Air-supplying valve 16 (1) and 16 (2) on branch road, regulates air relief valve 9, and (P=(1.2～1.5) p, p are prototype to set supply gas pressure P Basin reservoir hydrostatic pressure, p=γ h, wherein γ is the severe of water, and h is reservoir buried depth).To the simulation pipe of reservoir simulation system In be filled with coal bed gas, injection length continue more than 24h, close valve 8, air-supplying valve 16 (1) and 16 (2), stand 1 hour with On, Continuous Observation air gauge 19 (i) (19 (1)～19 (4)), such as stable reading, represent that simulation casing pack sample adsorption is conciliate Inhale coal bed gas and reach balance, enter next step；If any one air gauge 19 (i) reading is unstable, reopen valve 8, Air-supplying valve 16 (1) and 16 (2), continues to be filled with coal bed gas to the simulation pipe of reservoir simulation system.So the most repeatedly, until whole gas Pressure table 19 (i) stable reading, closes valve 8, air-supplying valve 16 (1) and 16 (2), enters and tests next step.Record gas simultaneously Mass flowmenter 12 and air gauge 19 (i) registration value, determine that system gas to be measured adds up the confession air pressure after being filled with quality and balance Power.

4) open water supply valve 15 successively, regulate constant pressure valve 20, open constant speed and constant pressure pump 13, store up with slightly above prototype basin The level of layer hydrostatic pressure p stablizes water filling in reservoir simulation system simulation pipeline 1, simulation pipeline 2 and simulation pipeline 3, test Flow is 0.1～0.5m³/ min, when current arrive valve 35 (1), opens valve 35 (1), valve 41 (1) and valve successively 31, in pipe, liquid arrives gas-liquid separator 38, realizes gas-liquid separation in gas-liquid separator 38 (1), and gas passes through valve 31 row Going out, returnable 39 collect, liquid flows through overflow chamber 38 (2), liquid collection receptacle 40 collect, by regulation discharge or place Put.

5) gas sample acquisition.According to test requirements document, determine sampling time interval, the most successively position, collection point 34 (1)～34 (4) The gas sample at place.When gathering the sample at sampled point 34 (1) place, close valve 41 (1), open valve 41 (2), stand certain time, Observing gas-liquid separator 27 side scale 42, record generates the time used by certain volume gas, gas volume at least 10ml with On, the reading of record temperature sensor 37, close valve 35 (1) and valve 41 (2), open valve 24, by feed pipe to gas Pressure balance bottle 28 supplies water, opens valve 33 simultaneously, use vacuum gas collecting bottle or sampler bag to collect gaseous sample, sample complete Close valve 33, gaseous sample is numbered.Treating that liquid refills gas-liquid separator 27 and gas pressure balancing bottle 28, gas-liquid is divided When not interspacing from the hydraulically full rear top of device 27, closing valve 24, sampled point 34 (1) is sampled complete.

The sample collecting at sampled point 34 (2) place, opens valve 35 (2) and valve 41 (1), makes sampled point 34 (2) place flow out Liquid discharge a period of time, so that last time remaining sample is released, close valve 41 (1), open valve 41 (2), stand one Fixing time, observe gas-liquid separator 27 side scale 42, record generates the time used by certain volume gas, and gas volume is at least More than 10ml, the reading of record temperature sensor 37, close valve 35 (2) and valve 41 (2), open valve 24, by feed pipe Supply water in gas pressure balancing bottle 28, open valve 33 simultaneously, use vacuum gas collecting bottle or sampler bag to collect gaseous sample, adopt Sample complete closedown valve 33, numbers gaseous sample, treats that liquid refills gas-liquid separator 27 and gas pressure balancing bottle 28, When the hydraulically full rear top of gas-liquid separator 27 does not interspaces, closing valve 24, sampled point 34 (2) is sampled complete.

Sampled point 34 (3) and the sample collecting process at sampled point 34 (4) place and method, with sampled point 34 (2), are opened successively Sampled point place pipe valve 35 (3) or valve 35 (4), sample successively, numbers gaseous sample, after having sampled, Reopening valve 35 (1) and valve 41 (1), the liquid flowing through reservoir simulation system flows to gas-liquid recovery system again.

6) until sampling time next time, step 5 is repeated) sample, so circulate, until off-test.

7) gas solubility calculates.Gas solubility is calculated as follows:

C_m=n/ (V_m×ρ) (1)

In formula: C_mFor the gas solubility under uniform temperature and 1 atmospheric pressure, mol/kg；

N is the gaseous sample molal quantity gathered, mol；

V_mThe volume of liquid is arranged for gathering gaseous sample, equal with the volume of the gaseous sample gathered in this experiment, m³；

ρ is the density of liquid, kg/m³。

8) experiment condition is changed, such as physical parameter (including ature of coal, granular size, porosity etc.), the supply of reservoir samples The conditions such as medium (pure methane gas), liquid medium (taking ionized water, pure water), water supply pressure, water supply flow, temperature, again Empirically step 1)～7) carry out.

Three, sample test, data analysis

The coal bed gas sample gathered is carried out component analysis and stable carbon isotope, hydrogen isotope test, adopts according to difference The sample component at sample interval and stable carbon isotope, hydrogen isotope Changing Pattern, it was predicted that Groundwater Flow is different to reservoir gas Location air content size and the impact of distribution, provide experiment basis, for very for coal-bed gas origin, Cheng Zang, occurrence status research Rule natural gas effective exploitation provides theory support.

Case study on implementation two:

One, prepare and simulation experiment before experiment

1 is prepared before experiment)～5) with embodiment one.Difference is:

1) before experiment in set-up procedure, step 3) in saturated need not be connected with threeway in pumped vacuum systems 10 second end take out Air pipe and vacuum pump 6, only connect the pipeline at place, high-pressure air feed source 7；Step 6) in, after pipeline has connected, to simulation pipe Filling sample in road 1～simulation pipeline 3, the fresh original gassiness coal petrography sample not having desorbing coal bed gas selected by described sample.

In simulation experiment, the sample of simulation pipeline 1～simulation pipeline 3 filling is original gassiness coal petrography sample, eliminates step Rapid 2) and step 3).From step 4) start to perform.It is directly loadable into storage after the original gassiness coal petrography sample quick crashing that will newly gather The simulation pipeline of layer analog systems, connects experimental provision, sets the pressure of constant pressure valve 20, opens inlet valve 15, by prototype basin Ground reservoir hydrostatic pressure p=γ h (γ is the severe of water, and h is reservoir buried depth) supplies water to simulation pipeline.Then by embodiment one Step 4 in simulation experiment)～6) test and sample.

Two, sample test, data analysis

Certainly the storage synclinal structure basin Water Soluble Gas transported simulation device of being conigenous of the present invention achieves for being certainly conigenous storage structure The simulation of basin geological condition, it is provided that subsoil water is to reservoir difference location primary sample Gas In Coalbed Gas Content size and distribution The experiment of impact, by the different location gas stable carbon isotope of test and the Changing Pattern of hydrogen isotope, the change of air content Law, by setting up the variation relation between air content and gas stable isotope, the analog acquisition of data, become for coal bed gas Cause, one-tenth are hidden, occurrence status research provides experiment basis, and the apparatus structure used is simple, and floor space is little, simulation test side Method is accurate, simple, provides the foundation theory support for the exploitation of coal bed gas/shale gas.

Claims

1. from being conigenous a storage synclinal structure basin Water Soluble Gas transported simulation device, including: reservoir simulation system, water system, Gas-liquid recovery system, sample collection system, saturated and pumped vacuum systems, lifting control system and thermostatic control system, its feature It is:

Reservoir simulation system includes simulating pipeline, and simulation pipeline is provided with multiple sampled point, and this reservoir simulation system is placed on In thermostatic control system, thermostatic control system provides predetermined operating temperature for reservoir simulation system；

Gas-liquid recovery system and sample collection system are all connected by pipeline with reservoir simulation system, collect reservoir simulation system stream The gas gone out and liquid；

Saturated it is connected with reservoir simulation system by pipeline with pumped vacuum systems, the sample of filling in reservoir simulation system is taken out very Empty and carry out the saturated process of gases at high pressure；

Lifting control system is used for suspending reservoir simulation system in midair, to put it in thermostatic control system or from thermostatic control system In hang out.

It is the most according to claim 1 from being conigenous storage synclinal structure basin Water Soluble Gas transported simulation device, it is characterised in that:

Reservoir simulation system includes the first simulation pipeline, the second simulation pipeline and the 3rd simulation pipeline, the first simulation pipeline and the Two simulation pipeline lower ends are interconnected by the 3rd simulation pipeline, and the upper end of the first simulation pipeline and the second simulation pipeline sets respectively Putting the 4th sampled point and the first sampled point, described 4th sampled point and the first sampled point connect sample by connecting line respectively and adopt Collecting system and gas-liquid recovery system, the 4th sampled point connects water system by connecting line；Pipeline and the 3rd is simulated first The simulation junction of pipeline and the second simulation pipeline and the 3rd junction simulating pipeline are respectively provided with the 3rd sampled point and the Two sampled points, any one in the 3rd sampled point and the second sampled point is respectively by connecting line and sample collection system and gas-liquid Recovery system connects and is connected with pumped vacuum systems with saturated.

4. storing up synclinal structure basin Water Soluble Gas transported simulation device according to being certainly conigenous described in claim 1 or 3, its feature exists In:

Lifting control system includes slinging beam, two vertical fixed mounts, a horizontal fixed mount and boom hoisting, and two vertical Fixed mount is respectively used to fix the first simulation pipeline and the second simulation pipeline and sampled point draws pipeline, and horizontal fixed mount is used for Fix the 3rd simulation pipeline；Two vertical fixed mounts are suspended on slinging beam two side lower part respectively, and horizontal fixed mount hangs down at two The bottom level of straight fixed mount is arranged, and bottom with these two vertical fixed mounts respectively, its two ends is connected, and slinging beam is lifted by crane Device is suspended on the lower section of boom hoisting.

5. storing up synclinal structure basin Water Soluble Gas transported simulation device according to being certainly conigenous described in claim 1 or 3, its feature exists In:

Feed pump is connected by supply channel with reservoir simulation system, arrange between this supply channel and feed pump water supply valve and Water pressure gauge, storage tank provides water source, constant pressure valve to be arranged on the connecting line between adapter and the first sampled point for feed pump, Feed pump is coordinated to set reservoir simulation system pressure.

6. storing up synclinal structure basin Water Soluble Gas transported simulation device according to being certainly conigenous described in claim 1 or 3, its feature exists In:

Gas-liquid recovery system includes that air gauge, the first excretory duct, valve, gas-liquid separator, gas returnable, liquids recovery are held Device；

Described gas-liquid separator is divided into gas-liquid separation chamber and overflow chamber's two parts, gas-liquid separation chamber by its internal vertical median septum Connecting in bottom with overflow chamber, top, overflow chamber has a hole, is connected by pipeline with liquid collection receptacle, gas-liquid separation chamber Top has two holes, and a hole is connected with gas returnable by pipeline, and this pipeline is provided with valve, and another hole passes through first Excretory duct is connected with the port that goes out of adapter, and the first excretory duct is provided with valve, and the first excretory duct pipe end inserts in gas-liquid separation It is not more than 1/2 height of gas-liquid separation chamber bottom the middle-range gas-liquid separation chamber of room, and the distance bottom gas-liquid separation chamber is not less than 2 ～the distance bottom the median septum distance from bottom gas-liquid separation chamber of 3 times.

7. store up synclinal structure basin Water Soluble Gas transported simulation device according to being certainly conigenous described in claim 1 or 3, it is characterised in that This analog also includes adapter；Wherein:

Described adapter is to have multiple inlet sides mouth and a pipeline connecting device going out port, and multiple inlet sides mouth of adapter divides Tong Guo not be connected with multiple sampled points of the simulation pipeline of reservoir simulation system by pipeline；The port that goes out of adapter is drained by first Pipe connects gas-liquid recovery system, and the first excretory duct pipeline is provided with valve；Adapter go out port also by the second excretory duct It is connected with sample collection system, the second excretory duct pipeline is provided with valve.

The most according to claim 1 from being conigenous storage synclinal structure basin Water Soluble Gas transported simulation device, it is characterised in that sample Product acquisition system includes sample collecting pipeline gentle liquid separating apparatus two parts, wherein:

Described sample collecting pipeline is the connecting line between the inlet side mouth of adapter and the sampled point of simulation pipeline, every pipeline On be respectively provided with air gauge and valve, described sample collecting pipeline is for gathering the gas-liquid mixed sample of reservoir simulation system different parts Product, the collection pipeline of different sampled points is collected to adapter, and inlet side mouth corresponding with adapter respectively connects, then by connecting The port that goes out of device is connected to gas-liquid separation device by the second drain line；

Described gas-liquid separation device includes valve, gas-liquid separator, gas pressure balancing bottle, gas-collecting pipe and temperature sensing Device；

Described gas-liquid separator is the lateral opening hole near bottom and the airtight transparent vessel of top drilling, and lateral marks is drawn and carved Degree, a hole in top drilling is installed gas-collecting pipe, gas-collecting pipe is installed collection and confinement of gases valve, gas-collecting pipe pipe End flushes with container top；The second excretory duct is inserted in another hole, and the second excretory duct is provided with valve, and the second excretory duct pipe end is deep Insert in gas-liquid separation chamber and be not more than at 1/3 height of gas-liquid separation chamber away from bottom under liquid level；Temperature sensing is installed in 3rd hole Device；

Described gas pressure balancing bottle is the transparent open-top receptacle in side opening 2 hole, and a hole is near top, for spout hole, spout hole Lower along highly flushing with gas-liquid separation bottle top；Another hole is near container bottom, position of opening and gas-liquid separation bottle bottom sides Perforate is the most identical, and this another hole passes through pipeline connection, gas pressure balancing with gas separating bottle near the perforate of bottom sides Placing feed pipe in bottle, the feed pipe other end connects storage tank, feed pipe arranges valve.

It is the most according to claim 8 from being conigenous storage synclinal structure basin Water Soluble Gas transported simulation device, it is characterised in that:

During work, filling water in gas-liquid separator and gas pressure balancing bottle, height of water level is along position under spout hole, gas Liquid/gas separator top does not interspaces.

Saturated and pumped vacuum systems includes vacuum pump, valve, high-pressure air feed source, pressure valve, air relief valve, air gauge, supplies makings Amount effusion meter, threeway；

It is provided with pressure valve, air relief valve, air gauge and confession on main supply air line between threeway the first end and high-pressure air feed source Gas mass flowmenter；Threeway the second end is connected with vacuum pump by pipeline, and this pipeline also is provided with valve；Threeway three-terminal link One end of supply air line, this supply air line other end separates two branch roads, and every branch road is adopted with the second sampled point and the 3rd respectively Sampling point connects, and two branch roads are respectively arranged with a valve.