CN109826621A - A kind of coal bed gas commingling production air water two phase fluid flow experimental provision and test method - Google Patents
A kind of coal bed gas commingling production air water two phase fluid flow experimental provision and test method Download PDFInfo
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Abstract
The invention belongs to coal bed gas geology and oil-gas reservoir field of engineering technology, more particularly to air water two phase fluid flow experimental provision under the conditions of a kind of coal bed gas commingling production, and the test method based on the experimental provision is further disclosed, solving the problems, such as that imitative experimental appliance is adopted in the conjunction of existing coal bed gas can not coal bed gas commingling production air water two phase fluid flow process under objective simulation stratum condition.Coal bed gas commingling production air water two phase fluid flow experimental provision of the present invention, including gas injection system, pumped vacuum systems, model system and the metering system that gas flow is set gradually along pipeline.The experimental provision through the invention can effectively simulate the gas-water phases flowing of true stratum Coal Under layer gas commingling production, realize seepage flow in layer, crossflow and the real-time monitoring along stroke pressure variation, more meet formation condition and actual production conditions.
Description
Technical field
The invention belongs to coal bed gas geology and oil-gas reservoir field of engineering technology, and in particular to a kind of coal bed gas commingling production gas
Water two phase fluid flow experimental provision, and the test method based on the experimental provision is further disclosed.
Background technique
Coal bed gas is commonly called as " gas ", refers to and is stored in coal seam using methane as main component, to be adsorbed on matrix of coal particle
Based on surface, partially it is free in coal hole or is dissolved in hydrocarbon gas in coal seam water.Coal bed gas is the associated minerals money of coal
Source belongs to Unconventional gas, is cleaning, high-grade energy and the industrial chemicals to emerge in the world in nearly ten or twenty year, coal bed gas
Development and utilization not only facilitate the exploitation of clear energy sources, and can generate huge economic benefit.
Coal bed gas high-efficiency mining has the multiple-effects such as the safe and environment-friendly, energy, and China is also dedicated to continue to promote coal bed gas
Exploration and development.China's coal accumulating basin generally develops multiple seam, and generally existing bed gas reservoir low pressure, hypotonic and low gas content are full
The characteristics of with spending, the case where causing coal bed gas well to develop low generally existing well yield, deficiency in economic performance.If do not taken any increasing
Production measure not only can make coal bed gas well yield lower, but also cbm development well will also lose the value of exploitation.
Coal bed gas commingling production is the important measure for improving coal bed gas well well yield, and commingling production technology is using flatly
Well opens simultaneously multiple gas-bearing formations and carries out closing the mode adopted, and which helps to improve the well yield of coal bed gas.However, due to not
With fluid communication, and development overlapping fluid pressure system is lacked between coal seam, cause the easily generation interlayer in commingling production dry
It disturbs and the problems such as reservoir development degree is unbalanced, serious person can even occur gas and flow backward phenomenon, not only greatly reduce coal seam
Gas production capacity more seriously hinders China's coal bed methane industrial process.
Closing and adopting physical analogy is to disclose coal bed gas to close the important method for adopting process medium fluid transmitting behavior, is facilitated to coal seam
Gas closes the process of adopting and gives certain theoretical direction.Currently, mainly passing through base to the research in terms of coal bed gas commingling production both at home and abroad
The empirical equation or model that the research of plinth geological theory obtains carry out；Alternatively, using COMET3, FastCBM, CBMRS1.0,
The commerciality software such as Eclipse carries out numerical simulation；Or developed in the prior art it is a variety of be conducive to simulate coal bed gas
The experimental provision of commingling production interlayer interference.But Numerical-Mode is still either carried out using business software based on theoretical research
Quasi-, the result of acquisition differs greatly with practical recovery process, is difficult in conjunction with field practice.And based on commingling production experiment dress
The mode for carrying out commingling production simulation is set, is referred to although certain theory can be given to practical exploitation work to a certain extent
It leads, but to adopt imitative experimental appliance bright in the prevalence of simulated conditions and actual formation condition difference for most existing coal bed gas conjunction
The problem of showing, leading to analog result poor reliability；Alternatively, due to be unable to complete air water two phase fluid flow experiment simulation with metering, with
And it can not simulate and monitor the defect for the crossflow phenomenon being likely to occur；Though being likely to occur alternatively, can simulate and monitor
Interlayer interference phenomenon, but can not the accurate measurement gas content that coal bed gas is flowed backward when flowing backward, it is difficult to the practical coal bed gas multilayer of guidance
The defects of conjunction is adopted.These defects largely constrain the science of coal bed gas commingling production evaluation, also affect coal
The yield of layer gas commingling production.
Summary of the invention
For this purpose, real technical problem to be solved by the present invention lies in a kind of coal bed gas commingling production air water two phase fluid flow is provided
Experiment device, with solve coal bed gas conjunction in the prior art adopt imitative experimental appliance can not coal bed gas multilayer under objective simulation stratum condition
Close gas production water two phase fluid flow process especially solves the problems, such as can not accurate measurement gas flow backward when coal bed gas reverse irrigation content；
Second technical problem to be solved by this invention is to provide a kind of coal bed gas commingling production air water two phase fluid flow
Test method.
In order to solve the above technical problems, the present invention is achieved by the following technical solutions:
On the one hand, the present invention discloses a kind of coal bed gas commingling production air water two phase fluid flow experimental provision, including along pipeline
Gas injection system, model system and the metering system that gas flow is set gradually；
The gas injection system includes gas source and gas pressure control component, for providing the medium gas of injection core experiment
Body；
The model system includes at least 2 groups of rock core simulated assemblies being arranged in parallel, and for controlling each rock core
The pressure-loaded component of rock core confining pressure and axis pressure inside simulated assembly, for simulating the coal bed gas product mistake under the conditions of true stratum
Journey；
The metering system includes at least 2 groups gas-liquid separations for being arranged in parallel and being correspondingly connected with the rock core simulated assembly
Component, the air-water two phase flow body for mutually simulating acquisition through the rock core simulated assembly are collected and detect respectively after gas-liquid separation,
And the control to system back pressure or gas flow is realized by system pressure control component, to simulate level pressure recovery process or constant current respectively
Measure recovery process.
Preferably, the gas-liquid separation component includes gas-liquid separator, and is connected respectively with the gas-liquid separator
Air water extraction measurement component and gas flow backward measurement component；
Air water extraction measurement component include the outlet with the gas-liquid separator be connected separated for measurement after
The graduated cylinder of water phase volume and for measure separation after gas phase flow rate first gas flowmeter；
It includes the second gas flowmeter being connected with the entrance of the gas-liquid separator that the gas, which flows backward measurement component,
For being carried out to the gas for entering the gas-liquid separator after other described gas-liquid separation component gas-liquid separations disposed in parallel
Metering；
Gas warp in the metering system, after the first gas flowmeter and second gas flowmeter metering
Total gas couette meter is measured.
Preferably, the system pressure control component includes for applying the back-pressure valve of back pressure to system and for controlling gas stream
The flow controller of amount；Level pressure recovery process or constant flow recovery process are simulated respectively.
Preferably, the rock core simulated assembly includes core holding unit；The inner cavity of the core holding unit is provided with receiving
The rock core chamber of rock core, and the axis pressure chamber for being set to rock core chamber two sides and the confining pressure chamber for being set to the rock core chamber periphery；
The pressure-loaded component includes controlling the axis respectively to press the axis of chamber and confining pressure cavity pressure pressure auto-loading system and confining pressure certainly
Dynamic loading system, so that the rock core obtains preset confining pressure and axis pressure.
Preferably, the rock core simulated assembly further includes the insulating box being set on the outside of the core holding unit, passes through control
The temperature of the rock core chamber is made with simulated formation temperature.
Preferably, the rock core simulated assembly further includes the pressure sensing for acquiring the core holding unit internal pressure
Device, and the differential pressure pickup for detecting core holding unit both ends pressure difference.
Preferably, the gas pressure control component includes gas booster pump, and the dielectric gas through gas source injection is increased by gas
Press pump is pressurized to goal pressure；
More preferably, the gas pressure control component is also optionally provided with pressure reducing valve and/or surge tank；The pressure reducing valve is set
It is placed in front of the gas booster pump, the dielectric gas for that will inject through gas source carries out reduced pressure treatment；The surge tank setting
After the gas booster pump, for storing the dielectric gas for being pressurized to goal pressure with stable high voltage atmospheric pressure.
Preferably, the experimental provision further includes the pumped vacuum systems before being set to the model system, is used for mould
Core sample in type system vacuumizes, so that dielectric gas and core sample come into full contact with absorption.
Preferably, it is additionally provided with the video camera for observing and recording graduated cylinder inner volume and its variation.
Another party, the invention also discloses a kind of coal bed gas commingling production air water two-phases carried out based on the experimental provision
Seepage Experiment test method, includes the following steps:
S1, connecting test pipeline, and will be interior in the core sample of the selected size loading core holding unit, and open institute
Pumped vacuum systems is stated, will realize vacuumize process in the model system, then passes through gas injection system injected media gas,
Make dielectric gas filling, be adsorbed in the crack and hole of core sample, then injects water flooding into the core holding unit,
Simulate the saturated aqueous environment of subsurface reservoir；
S2, according to actual formation condition, press loading system respectively to described by the confining pressure loading system and axis respectively
The rock core chamber in core holding unit applies the confining pressure and axis pressure of setting；And the rock core chamber is carried out by the insulating box
Heating, to simulate actual reservoir temperature；
S3, the back pressure that system is set by the back-pressure valve in the metering system, or pass through the flow control
Gas flow in device setting system, to simulate level pressure decaying exploitation or constant flow decaying exploitation respectively；
S4, by the injected system, according to setting pressure injection in the core holding unit of Xiang Suoshu model system
Dielectric gas；The water flowing that rock core described in displacement is intracavitary after gas injection, and air water two-phase is formed inside each rock core
Fluid, and by the pressure sensor and differential pressure pickup, record air water flowing changes along stroke pressure；
After S5, air-water two phase flow body flow out the core holding unit, into the metering system, and pass through the gas-liquid point
Gas and water two-phase laminated flow is realized from device, and the water after separation enters in the graduated cylinder, and passes through water in the camera record graduated cylinder
Volume change, to realize the metering of water flow；And the gas after separating then enters gas flowmeter and realizes metering；
S6, until water does not flow, throughput terminates experiment after stablizing, and carries out data processing, obtains simulated experiment result.
Preferably, in the step S5, the gas dosing step include with the first gas flowmeter described in warp
The step of gas after gas-liquid separator separates is measured, with the second gas flowmeter to by other components from and flow backward
Enter the step of gas of the gas-liquid separator is measured, and to through the first gas stream in terms of the total gas couette
The step of gas after meter and second gas flowmeter metering carries out gas gross metering.
Preferably, each group gas-liquid separation component separation after gas enter corresponding gas flowmeter before, by drying tube into
Row is dried.
It preferably, further include carrying out being pressurized to mesh by gas booster pump to the dielectric gas of injection in the step S4
The step of marking pressure, and the step of selective injection surge tank carries out steady pressure treatment.
Compared with prior art, the present invention can at least realize one of following beneficial effect:
A) coal bed gas commingling production air water two phase fluid flow experimental provision provided by the invention is equipped with gas injection system, takes out
Vacuum system, model system and metering system, structure is simple, easy to operate, can effectively simulate true stratum Coal Under layer
The gas-water phases flowing of gas commingling production is realized seepage flow in layer, crossflow and the real-time monitoring along stroke pressure variation, is sufficiently examined
Actual formation confining pressure, axis pressure and temperature condition are considered, it is automatic that the rock core simulated assembly is equipped with axis pressure auto-loading system, confining pressure
Loading system and insulating box, so that the rock core obtains preset confining pressure, axis pressure and temperature, so that simulated conditions be made more to meet reality
Border formation condition, significantly improves the reliability of experimental result, and analog result is closer to practical condition；
B) coal bed gas commingling production air water two phase fluid flow experimental provision provided by the invention, has been specifically designed bidirectional measuring mould
Formula, i.e., the described gas-liquid separation component includes gas-liquid separator, and the air water extraction being connected respectively with the gas-liquid separator
It measures component and gas flows backward measurement component, flow backward from after through the gas of the same level gas-liquid separator separates and other components respectively
The gas for entering the same level gas-liquid separator is measured；
When interlayer interference occurs in experimentation, the positive gas from this clamper passes through first gas flowmeter
It is measured；And then pass through the meter that second gas flowmeter realizes channelling gas from the reversed gas of other core holding units
Amount, the experimental provision with bidirectional measuring component can be monitored the crossflow occurred during commingling production and accurately
Metering；
C) coal bed gas commingling production air water two phase fluid flow experimental test procedures provided by the invention, first by rock core saturated water
The rock core for being placed in core holding unit is intracavitary, and sets confining pressure, axis pressure and temperature, is then infused with different gas injection pressures
Gas carries out the experiment of gas drive water, and by measuring gas and water output respectively and changing along stroke pressure, gas production water two phase fluid flow is closed in simulation
And pressure transfer process, until outlet it is anhydrous outflow and gas flow reach stablize after terminate to test, whole experiment process behaviour
Make simply, it is easily controllable, and fully considered that actual formation confining pressure, axis pressure and temperature condition, simulated conditions are more in line with reality
Border formation condition, the more reliable property of experimental result；Using the bidirectional measuring mode of design, realizes and occur to during commingling production
Crossflow be monitored and accurate measurement, more meet formation condition and actual production conditions, closed for objective announcements and adopt fluid
Dynamic behaviour and interlayer interference provide approach, are of great significance to the research and practical exploration and development of coal bed gas commingling production.
Detailed description of the invention
In order to make the content of the present invention more clearly understood, it below according to specific embodiments of the present invention and combines
Attached drawing, the present invention is described in further detail, wherein
Fig. 1 is the structural schematic diagram of coal bed gas commingling production air water two phase fluid flow experimental provision in embodiment one；
Fig. 2 is the partial enlarged view of the model system in Fig. 1；
Fig. 3 is the partial enlarged view of the metering system in Fig. 1.
Appended drawing reference indicates in figure are as follows: 1- gas injection system, 11- gas source, 12- gas booster pump, the compression of 13- air
Machine, 14- high-pressure buffering pot, 15- gas pressure regulating valve, 16- pressure gauge, 2- vacuum system, 21- vacuum pump, 22- valve, 3- mould
Type system, 31- insulating box, 32- core holding unit, 33- confining pressure auto-loading system, 34- axis press auto-loading system, 35- pressure
Force snesor, 36- differential pressure pickup, 37- pressure regulator valve, 321- rock core chamber, 322- axis pressure chamber, 323- confining pressure chamber, 4- metering system,
41- gas-liquid separator, 42- video camera, 43- graduated cylinder, 44- drying tube, 45-0- total gas couette meter, 45-1- first gas flow
Meter, 45-2- second gas flowmeter, the first check valve of 46-1-, 46-2- second one-way valve, 47- back-pressure valve, 48- flow control
Device.
Specific embodiment
Specifically describing the preferred embodiment of the present invention with reference to the accompanying drawing, wherein attached drawing constitutes the application a part, and
Together with embodiments of the present invention for illustrating the principle of the present invention, it is not intended to limit the scope of the present invention.
Embodiment one
Experimental provision as shown in Figs. 1-3, coal bed gas commingling production air water two phase fluid flow experimental provision described in the present embodiment
For three axis air water two phase fluid flow experimental provisions, close by simulation multilayer coal seam and adopt, it is special to inquire into the mutual interference in coal seam
Sign.Coal bed gas commingling production air water two phase fluid flow experimental provision described in the present embodiment mainly passes through three layers of coal core samples parallel connection
Mode carries out commingling production simulated experiment, the conditions pairing gas production water flowings such as research interlayer permeability contrast, reservoir pressure difference
The influence of behavior is, it can be achieved that air-water two phase flow body output, reflux, real-time monitoring and metering along stroke pressure.
Experimental provision as shown in Figs. 1-3, coal bed gas commingling production air water two phase fluid flow experimental provision described in the present embodiment,
Including gas injection system 1, model system 3 and the metering system 4 that gas flow is set gradually along pipeline, and in the model
Pumped vacuum systems 2 is equipped with before system 3；Wherein,
The injected system 1 includes gas source 11 and gas pressure control component, for providing the medium gas of injection core experiment
Body, wherein dielectric gas be pure methane or the gas that can be adsorbed in coal seam based on methane, can also be according to research
Purpose configures heterogeneity gas CH4+N2+CO2Deng；
The pumped vacuum systems 2 includes vacuum pump 21, for extracting the air inside the model system 3, to be formed simultaneously
Simulate vacuum environment；
The model system 3 includes rock core simulated assembly, and for controlling rock core pressure inside the rock core simulated assembly
The pressure-loaded component of power, for simulating the coal bed gas product process under the conditions of true stratum；
The metering system 4 includes gas-liquid separation component, and air-water two phase flow body is collected and examines respectively after gas-liquid separation
It surveys, and the control to system back pressure or gas flow is realized by system pressure control component, simulate level pressure recovery process or fixed respectively
Flow recovery process.
Experimental provision as shown in Figure 1, in experimental provision described in the present embodiment, in the injected system 1, the gas control
Pressing component includes gas booster pump 12, and the dielectric gas injected through gas source 11 can be pressurized to target pressure by gas booster pump 12
Power, and continue to be injected into progress air water flow simulating in the model system 3.
In order to preferably control the pressure condition for the gas medium that the injected system 1 provides, injected described in the present embodiment
The gas pressure control component of system 1 further includes being provided with pressure reducing valve 17 and/or surge tank 14；The pressure reducing valve 17 is set to institute
Before stating gas booster pump 12, the dielectric gas for that will inject through gas source 11 carries out reduced pressure treatment；The surge tank 14 is arranged
After the gas booster pump 12, for storing the dielectric gas for being pressurized to goal pressure with stable high voltage atmospheric pressure.Medium
Gas is depressurized after the output of gas source 11 by pressure reducing valve 17, then is pressurized to goal pressure by booster pump 12, is subsequently injected into buffering
The pressure of stable high voltage gas in tank 14, the dielectric gas after 14 pressure stabilizing of surge tank, by gas pressure regulating valve 15 to the mould
The dielectric gas of injection steady pressure in type system 3, and acquired pressure information by pressure gauge 16 and adjusted immediately.This reality
It applies the example injected system 1 and is additionally provided with air compressor 13, it is dynamic for being provided for gas booster pump 12 and gas pressure regulating valve 15
Power source.
Experimental provision as shown in Figure 1, in experimental provision described in the present embodiment, the pumped vacuum systems 2 mainly includes taking out
The vacuum pump 21 and valve 22 of vacuum form vacuum environment for the air inside extraction model system 3.
In structure as shown in Figs. 1-2, in experimental provision described in the present embodiment, the model system 3 passes through to rock core mould
The control of quasi- component is the core of whole device to simulate the coal bed gas product process under the conditions of true stratum.
The rock core simulated assembly includes core holding unit 32, and the inner cavity of the core holding unit 32 is provided with receiving choosing
The rock core chamber 321 of scale cun rock core, and be set to the axis pressure chamber 322 of 321 two sides of rock core chamber and be set to the rock core
The confining pressure chamber 323 of 321 periphery of chamber.The pressure-loaded component then includes controlling the axis pressure chamber 322 and the pressure of confining pressure chamber 323 respectively
The axis pressure auto-loading system 34 and confining pressure auto-loading system 33 of power.According to target confining pressure, pass through the confining pressure loading system
33 give the inside rock core of the core holding unit 32 to apply confining pressure；According to target axis pressure, loading system 34 is pressed to give by the axis
The 32 inside rock core of core holding unit applies axis pressure, so that the rock core obtains preset confining pressure and axis pressure.
Difference is transmitted in order to monitor the pressure of different coal during conjunction is adopted, experimental provision described in the present embodiment devises
The pressure acquisition scheme combined is acquired in 32 internal pressure of core holding unit acquisition and clamper both ends pressure difference, i.e., in institute
The pressure sensor 35 that several acquisition 32 internal pressures of core holding unit are set at core holding unit 32 is stated described in acquisition
The differential pressure pickup 36 of 32 both ends pressure difference of core holding unit.Enter the medium gas of the model system 3 via the injected system 1
Body further injects into the core holding unit 32 and carries out simulated experiment after the further adjusting of pressure regulator valve 37 and steady pressure.
In order to control the temperature of rock core described in the rock core chamber 321 with simulated formation temperature, tested described in the present embodiment
Device is provided with the insulating box 31 of controllable temperature in the periphery of the core holding unit 32, and the insulating box 31 is mainly used for rock core
The rock core chamber of clamper 32 heats, with simulated formation temperature (- 200 DEG C of room temperature).
In experimental provision as shown in Figs. 1-2, the rock core simulated assembly is set as 3 groups of routes in parallel, through the note
Enter the dielectric gas that system 1 enters the model system 3, branches in 3 groups of gas passages in parallel, respectively and on respective route
The core holding unit 32 in the rock core that is arranged form air-water two phase flow body, and carry out subsequent experiment and measure.
In experimental provision as shown in Figs. 1-3, the metering system 4 of the present embodiment described device includes gas-liquid separation group
Part, the air water two-phase simulation fluid formed through the model system 3 enter the gas-liquid separation component and carry out gas-liquid separation, separation
Gas and liquid afterwards is collected and detects respectively.The system pressure control component that the experimental provision also passes through setting is realized to system
Level pressure recovery process or constant flow recovery process are simulated in the control of back pressure or gas flow respectively.
In experimental provision as shown in Figs. 1-3, the gas-liquid separation component is designed as and the rock core simulated assembly phase one
One be correspondingly arranged amount to 3 groups of parallel lines, i.e., rock core simulated assembly described in every group be respectively correspondingly connected with one group described in gas-liquid
Separation assembly.
In experimental provision as shown in Figs. 1-3, the gas-liquid separation component includes gas-liquid separator 41, in order to simulate coal
Layer gas closes the gas during adopting and flows backward phenomenon and accurately obtain the coal bed gas content data that generation gas flows backward, the present embodiment institute
It states the standby air water being connected respectively with the gas-liquid separator 41 that devises of device spy and produces measurement component and gas reverse irrigation measurement
Component.
Air water extraction measurement component includes separating for measurement of being connected of the outlet with the gas-liquid separator 41
Afterwards the graduated cylinder 43 of water phase volume and for measure separation after gas phase flow rate first gas flowmeter 45-1；Through the gas-liquid point
From device 41 separate after liquid enter the graduated cylinder 43 collect, and pass through video camera 42 observe and record graduated cylinder inner volume and its
Variation；And then the gas after separating enters gas by check valve 46-1 then after processing is further dried in drying tube 44
Flowmeter 45-1 is measured.
It includes the second gas flow being connected with the entrance of the gas-liquid separator 41 that the gas, which flows backward measurement component,
45-2 is counted, for entering the gas-liquid separator 41 after other described gas-liquid separation component gas-liquid separations disposed in parallel
Gas is measured；Gas after being separated in gas-liquid separation component described in second group of diagram and/or third group, if flowing backward into the
In gas-liquid separator 41 described in one group, then flow backward into gas need to enter second gas stream by second one-way valve 46-2 respectively
Meter 45-2 is measured, thus obtain flow backward first group described in gas gross in rock core simulated assembly；
If the gas in rock core simulated assembly described in first group is simultaneously to rock core simulated assembly described in second group and third group
It pours into, then the gas after separating in first group of gas-liquid separation component passes through the second one-way valve 46-2 of second group and third group respectively
It is measured into second gas flowmeter 45-2, obtains the gas flow for pouring into second group and third group respectively.
In experimental provision as shown in Figs. 1-3, the air-water two phase flow to be formed is simulated through rock core simulated assembly described in first group
Body enters the gas-liquid separation component described in first group of connection that is corresponding to it, and the liquid after the gas-liquid separator 41 separation enters
The graduated cylinder 43 is collected, and observes and record graduated cylinder inner volume by video camera 42；And the gas after separating then passes through drying
After processing is further dried in pipe 44, first gas flowmeter 45-1 is then entered by the first check valve 46-1 and is measured.If
Gas after being separated in gas-liquid separation component described in second group and third group flow backward first group described in rock core simulated assembly, the
Gas after separating in gas-liquid separation component described in two groups and third group then passes through the entrance of the second one-way valve 46-2 in first group
Second gas flowmeter 45-2 is measured, thus obtain flow backward first group described in gas gross in rock core simulated assembly；
If the gas in rock core simulated assembly described in first group is poured into rock core simulated assembly described in second group and third group simultaneously, the
Gas after separating in one group of gas-liquid separation component passes through second group and the second one-way valve 46-2 of third group respectively and enters second
Gas flowmeter 45-2 is measured, and obtains the gas flow for pouring into second group and third group respectively.Correspondingly, as shown in Figure 1
The course of work of two groups and third group gas-liquid separation component is same as above.And in the metering system 4, through the first gas flowmeter
Gas after 45-1 and second gas flowmeter 45-2 metering is measured through total gas couette meter 45-0, to obtain gas
The conceptual data of flow.
Experimental provision provided in this embodiment has been specifically designed above-mentioned bidirectional measuring mode, just from this clamper
It is measured to gas (extraction gas) by first gas flow 45-1；And from the reversed of other core holding units 32
Gas (i.e. reverse irrigation gas) then realizes the metering of channelling gas by second gas flow 45-2 meter, closes to realize to multilayer
The crossflow occurred during adopting is monitored and accurate measurement, more meets formation condition and actual production conditions, is objective
It discloses and computational fluid dynamics behavior and the interlayer interference offer approach adopted, research and practical exploration and development tool to coal bed gas commingling production is provided
It is significant.
In experimental provision as shown in Figs. 1-3, total gas couette meter 45- is set in the bus of the gas-liquid separation component
0 can realize the metering to bus gas flow, and is set to the back-pressure valve 47 in bus and can be used for applying system
Back pressure, to simulate level pressure recovery process；Or the flow controller 48 by being similarly provided in bus passes through control bus gas
Body flow, to simulate constant flow recovery process.
In the present embodiment, the coal bed gas commingling production air water two phase fluid flow experimental provision, experimenter can be according to reality
The border working seam number of plies increases or reduces the rock core simulated assembly being arranged in parallel and the concatenated gas-liquid that is corresponding to it
Separation assembly, the gas-liquid separation component are also incorporated into bus and carry out detection of gas flow rate and control, so as to realize simulation
The commingling production of different coal number.
In the present embodiment, multiple outlet valves are arranged in gas injection system 1, are connected by control from different rock core simulated assemblies
The outlet valve connect adjusts the simulated pressure size of corresponding rock core simulated assembly；It is of course also possible to for each group of rock core simulation
A set of gas injection system 1 is separately provided in component.
Experimental provision provided in this embodiment, before being used not only for scientific research, production unit progress commingling production
Prediction, moreover it can be used to experimental teaching.In order to study coal bed gas from the rock core in core sample output process and mechanism, the present embodiment
Clamper 32 and insulating box 31 are made of transparent material, are preferably made of tempered glass, when experiment, can visually observe coal bed gas
The resolving from core sample can also use camera record coal bed gas resolving from core sample, be used by playback
In follow-up study and teaching demonstration.
In the present embodiment, elemental analyser can also be arranged in metering system 4, and elemental analyser is set to metering system 4
Bus and/or gasmetry pipeline, for testing during commingling production micronutrient levels and its real-time change in output water
Data, be added in core sample saturated water in advance with the same or similar microelement of actual formation water, thus obtain multilayer and close
Output water trace element change law curve in mining coal seam, theoretical research and actual production to coal bed gas commingling production have weight
Want meaning.
In the present embodiment, rock core simulated assembly can connect water flooding fill assembly, and simulation subterranean coal gas reservoir is aqueous
True environment state can also connect bottom water simulated assembly, aqueous and adopt bottom with coal bed gas for simulating coal seam reservoirs bottom stratum
Water pours in the process of coal seam reservoirs, is above that this field has maturation method, and non-present invention key point, no longer superfluous herein
It states.In the present embodiment, 3 vacuumize process of model system is then passed through into gas injection system using pumped vacuum systems 2
1 injected media gas makes dielectric gas filling, is adsorbed in core sample crack and hole, then into core holding unit 32
Water flooding is injected, the saturated aqueous environment of subsurface reservoir is simulated, truly descends coalbed methane reservoir environment to utmostly simulate, mention
The high reliability of analog result.
Embodiment two
Coal bed gas commingling production air water two phase fluid flow experimental test procedures described in the present embodiment are based on real in embodiment one
What experiment device was simulated and was tested, specifically comprise the following steps:
Equidimension core sample is packed into core holding unit 32 by S1, preparation, connecting test pipeline respectively, control
Sample is having a size of diameter 25mm, length 50-200mm；The valve 22 and vacuum pump 21 for then turning on vacuum system 2, by the mould
Vacuumize process is realized in type system 3, then by 1 injected media gas of gas injection system, makes dielectric gas filling, absorption
In the crack and hole of core sample, water flooding, simulation subsurface reservoir saturation are then injected into the core holding unit 32
Aqueous environment；
S2, according to actual formation stress and temperature condition, pass through the confining pressure loading system 33 in the model system 3
The rock core chamber 321 into core holding unit 32 applies the confining pressure and axis pressure set respectively with axis pressure loading system 34, it is preferable that will
Confining pressure is set as 0~70MPa, and axis pressure is set as 0~70MPa；It is pressed from both sides by the insulating box 31 of controllable temperature to the rock core
The rock core chamber 321 of holder 32 heats, to simulate actual reservoir temperature, it is preferable that heating temperature is 0~200 DEG C；
The back pressure of system is set in S3, the present embodiment by the back-pressure valve 47 in the metering system 4, it is preferable that
Set 0~50MPa for back pressure, by simulate level pressure decaying exploitation in the form of；
S4, by the gas injection system 1, according to setting in the parallel core holding unit 32 of 3 groups of Xiang Suoshu model system 3
Constant-pressure injects gas；And 32 input end of core holding unit is adjusted by pressure regulator valve 37 preposition in the model system 3
Gas pressure, core holding unit 32 described in each group is adjustable as different gas injection pressures, but cannot be greater than gas and inject
The gas injection pressure of system 1；After gas injects the core holding unit 32, by the water flowing in displacement rock core, and in each rock core
Portion forms air-water two phase flow, by several pressure sensors 35 at the rock core chamber 321 and is set to the rock core folder
The differential pressure pickup 36 at 32 both ends of holder records air water flowing respectively and changes along stroke pressure；
After S5, after mixing air water two-phase simulation fluid flow out the core holding unit 32, that is, leave the model system
3, enter the metering system 4 therewith；Two-phase fluid into the metering system 4 passes through the gas-liquid separator 41 in fact first
Existing gas and water separation, the water after being subsequently isolated then travels further into graduated cylinder 43, and records water in the graduated cylinder 43 by video camera 42
Volume change, to realize the metering of water flow；And from the gas that gas-liquid separator 41 comes out then after drying tube 44 is dry,
First flowmeter 45-1 is further entered by the first one-way cock 46-1 and realizes metering；Simultaneously as being 3 groups of core holding units
32 are arranged in parallel, and may have the gas of the core holding unit 32 from other groups to enter this route, logical first if having
It crosses second one-way valve door 46-2 and enters second flowmeter 45-2 and realize metering, the as tolerance of crossflow, by metering
Channelling gas will be incorporated to the knot of 41 top of gas-liquid separator；
S6, complete separated time gas and water flow metering after, gas is finally incorporated to bus, passes through the total gas couette in bus
The gas flow of 45-0 metering bus is counted, until water does not flow, throughput terminates experiment after stablizing, and carries out data processing, obtains
Obtain simulated experiment result.
The experimental result twice obtained using above-mentioned experimental provision and test method is given below.
For the first time test: setting 3 groups of parallel connection core holding units 32, from top to bottom confining pressure be successively 3MPa, 4MPa,
5Mpa, axis press 2MPa, 3MPa, 4MPa, 20 DEG C of temperature, 30 DEG C, 40 DEG C, and system back pressure is 0.5MPa, and gas injection pressure is from top to bottom
Respectively 4,5,6MPa, it is the certified reference coal (diameter 25mm, length 50mm) of 1mD that core sample, which selects permeability, is carried out accordingly
The experiment of commingling production air water two phase fluid flow.After Therapy lasted 45 seconds 12 minutes, no liquid output, air-flow reaches stable.By up to
Under each layer accumulative Liquid output be 0.22mL, 0.31mL, 0.35mL, cumulative gas 7.66mL, 9.95mL, 11.14mL.Pressure
Force snesor 35 along journey be distributed in sample length 12.5,25.0, at 37.5mm, change when stablizing along stroke pressure are as follows: top layer,
3.1MPa, 1.9MPa, 1.0MPa；Middle layer, 3.7MPa, 2.3MPa, 1.1MPa；Lowest level, 4.8MPa, 3.3MPa, 1.1MPa.
The sample both ends pressure difference that differential pressure pickup 36 is shown when stablizing from top to bottom is followed successively by 3.3MPa, 4.1MPa, 5.2MPa.It can be seen that from
As the increase of gas injection pressure, steady timed samples both ends pressure difference successively increase under, air-liquid flow is increase accordingly, displacement effect
Fruit is also become better and better, and has no crossflow phenomenon.
Second tests: 3 groups of parallel connection core holding units 32 of setting, from top to bottom confining pressure be successively 3MPa, 4MPa,
5Mpa, axis press 2MPa, 3MPa, 4MPa, 20 DEG C of temperature, 30 DEG C, 40 DEG C, and system back pressure is 0.5MPa, and three layers of gas injection pressure are
5MPa, core sample select permeability for 5mD, the certified reference coal (diameter 25mm, length 50mm) of 1mD, 0.5mD, from top to bottom
It is sequentially arranged, carries out the experiment of commingling production air water two phase fluid flow accordingly.After Therapy lasted 02 second 10 minutes, no liquid output, gas
Stream reaches stable.From top to bottom the accumulative Liquid output of each layer is 0.78mL, 0.28mL, 0.07mL, and cumulative gas is
19.33mL, 8.81mL, 1.25mL.Pressure sensor 35 along journey be distributed in sample length 12.5,25.0, at 37.5mm, when stablizing
Change along stroke pressure are as follows: top layer, 3.5MPa, 2.2MPa, 1.0MPa；Middle layer, 3.9MPa, 2.7MPa, 1.3MPa；It is most lower
Layer, 4.3MPa, 3.4MPa, 2.6MPa.The sample both ends pressure difference that differential pressure pickup 36 is shown when stablizing from top to bottom is followed successively by
4.3MPa, 3.9MPa, 3.2MPa.It can be seen that steady timed samples both ends pressure difference successively reduces from top to bottom with the reduction of permeability,
Air-liquid flow accordingly reduces, and Flooding Efficiency worse and worse, has no crossflow phenomenon.
Embodiment three
Coal bed gas commingling production air water two phase fluid flow experimental test procedures described in the present embodiment are based on real in embodiment one
What experiment device was simulated and was tested, specifically comprise the following steps:
Equidimension core sample is packed into core holding unit 32 by S1, preparation, connecting test pipeline respectively, control
Sample is having a size of diameter 25mm, length 50-200mm；The valve 22 and vacuum pump 21 for then turning on vacuum system 2, by the mould
Vacuumize process is realized in type system 3, then by 1 injected media gas of gas injection system, makes dielectric gas filling, absorption
In the crack and hole of core sample, water flooding, simulation subsurface reservoir saturation are then injected into the core holding unit 32
Aqueous environment；
S2, according to actual formation stress and temperature condition, pass through the confining pressure loading system 33 in the model system 3
The rock core chamber 321 into core holding unit 32 applies the confining pressure and axis pressure set respectively with axis pressure loading system 34, it is preferable that will
Confining pressure is set as 0~70MPa and axis pressure is set as 0~70MPa；It is clamped by the insulating box 31 of controllable temperature to the rock core
The rock core chamber 321 of device 32 heats, to simulate actual reservoir temperature, it is preferable that heating temperature is 0~200 DEG C；
The bus gas of system is set in S3, the present embodiment by the flow controller 48 in the metering system 4
Flow, it is preferable that by flow set be 0~5L/min, by simulate constant flow decaying exploitation in the form of；
S4, by the gas injection system 1, according to setting in the parallel core holding unit 32 of 3 groups of Xiang Suoshu model system 3
Constant-pressure injects gas；And 32 input end of core holding unit is adjusted by pressure regulator valve 37 preposition in the model system 3
Gas pressure, core holding unit 32 described in each group is adjustable as different gas injection pressures, but cannot be greater than gas and inject
The gas injection pressure of system 1；After gas injects the core holding unit 32, by the water flowing in displacement rock core, and in each rock core
Portion forms air-water two phase flow, by several pressure sensors 35 at the rock core chamber 321 and is set to the rock core folder
The differential pressure pickup 36 at 32 both ends of holder records air water flowing respectively and changes along stroke pressure；
After S5, after mixing air water two-phase simulation fluid flow out the core holding unit 32, that is, leave the model system
3, enter the metering system 4 therewith；Two-phase fluid into the metering system 4 passes through the gas-liquid separator 41 in fact first
Existing gas and water separation, the water after being subsequently isolated then travels further into graduated cylinder 43, and records water in the graduated cylinder 43 by video camera 42
Volume change, to realize the metering of water flow；And from the gas that gas-liquid separator 41 comes out then after drying tube 44 is dry,
First flowmeter 45-1 is further entered by the first one-way cock 46-1 and realizes metering；Simultaneously as being 3 groups of core holding units
32 are arranged in parallel, and may have the gas of the core holding unit 32 from other groups to enter this route, logical first if having
It crosses second one-way valve door 46-2 and enters second flowmeter 45-2 and realize metering, the as tolerance of crossflow, by metering
Channelling gas will be incorporated to the knot of 41 top of gas-liquid separator；
S6, complete separated time gas and water flow metering after, gas is finally incorporated to bus, passes through the total gas couette in bus
The gas flow of 45-0 metering bus is counted, until water does not flow, throughput terminates experiment after stablizing, and carries out data processing, obtains
Obtain simulated experiment result.
The present embodiment, in order to simulate the interlayer interference phenomenon of commingling production generation, and the coal seam that accurate measurement is flowed backward
3 groups of parallel connection core holding units 32 are arranged in Gas content, and from top to bottom confining pressure is successively 3MPa, 4MPa, 5Mpa, axis press 2MPa,
3MPa, 4MPa, 20 DEG C of temperature, 30 DEG C, 40 DEG C, flow controller 48 are set as 5mL/min, three layers of gas injection pressure be followed successively by 4MPa,
10MPa, 6MPa, core sample select permeability for 0.5mD, the certified reference coal (diameter 25mm, length 50mm) of 10mD, 1mD, by
It is sequentially arranged under, carries out the experiment of commingling production air water two phase fluid flow accordingly.
Experiment occurs gas after starting 9 seconds and flows backward phenomenon, and the gas in second group of rock core simulated assembly is to other two groups of rocks
Flow backward in heart simulated assembly, i.e. gas after separating in second group of gas-liquid separation component passes through the of first group and third group respectively
Two check valve 46-2 enter second gas flowmeter 45-2, and the second gas flowmeter 45-2 of first group and third group is at the moment
It shows, shows there is gas inflow.At this point, second group of accumulative Liquid output is 0.46mL, first group of accumulative Liquid output is
0.01mL, the accumulative Liquid output of third group are 0.05mL.
After Therapy lasted 28 seconds 8 minutes, no liquid output, air-flow reaches stable.The accumulative Liquid output of each layer from top to bottom
For 0.06mL, 0.77mL, 0.21mL, cumulative gas 0.9mL, 35.75mL, 5.7mL, pour into experimentation first group and
The gas flow of third group finally all flows out, and flows backward phenomenon and betides experiment initial stage, in the process first group of maximum gas amount of pouring into
For 9.23mL, second group of maximum gas amount of pouring into is 6.75mL.It should be noted that the cumulative gas of each layer is first gas
The aggregate-value of flowmeter 45-1 subtracts the aggregate-value of second gas flowmeter 45-2, to obtain the practical gas production of each layer itself.
Pressure sensor 35 along journey be distributed in sample length 12.5,25.0, at 37.5mm, change when stablizing along stroke pressure are as follows: top layer,
3.6MPa, 2.5MPa, 1.9MPa；Middle layer, 8.3MPa, 5.6MPa, 3.0MPa；Lowest level, 5.1MPa, 3.4MPa, 1.8MPa.
The sample both ends pressure difference that differential pressure pickup 36 is shown when stablizing from top to bottom is followed successively by 2.3MPa, 8.3MPa, 4.4MPa.It is testing
In the process, the entire interlayer interference process of camera record can be used, can be used for follow-up study analysis and teaching demonstration.
Obviously, the above embodiments are merely examples for clarifying the description, and does not limit the embodiments.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of variation or
It changes.There is no necessity and possibility to exhaust all the enbodiments.And it is extended from this it is obvious variation or
It changes still within the protection scope of the invention.
Claims (10)
1. a kind of coal bed gas commingling production air water two phase fluid flow experimental provision, which is characterized in that including the gas flow along pipeline
Gas injection system (1), model system (3) and the metering system (4) set gradually；
The gas injection system (1) includes gas source (11) and gas pressure control component, for providing Jie of injection core experiment
Matter gas；
The model system (3) includes at least 2 groups of rock core simulated assemblies being arranged in parallel, and for controlling each rock core mould
The pressure-loaded component of quasi- component internal rock core, for simulating the coal bed gas product process under the conditions of true stratum；
The metering system (4) includes at least 2 groups gas-liquid separations for being arranged in parallel and being correspondingly connected with the rock core simulated assembly
Component, the air-water two phase flow body for mutually simulating acquisition through the rock core simulated assembly are collected and detect respectively after gas-liquid separation,
And the control to system back pressure or gas flow is realized by system pressure control component, to simulate level pressure recovery process or constant current respectively
Measure recovery process.
2. coal bed gas commingling production air water two phase fluid flow experimental provision according to claim 1, which is characterized in that the gas
Liquid separation assembly includes gas-liquid separator (41), and the air water extraction measurement being connected respectively with the gas-liquid separator (41)
Component and gas flow backward measurement component；
Air water extraction measurement component include the outlet with the gas-liquid separator (41) be connected separated for measurement after
The graduated cylinder (43) of water phase volume and for measure separation after gas phase flow rate first gas flowmeter (45-1)；
It includes the second gas flowmeter being connected with the entrance of the gas-liquid separator (41) that the gas, which flows backward measurement component,
(45-2), for entering the gas-liquid separator (41) to after other described gas-liquid separation component gas-liquid separations disposed in parallel
Gas measured；
In the metering system (4), counted through the first gas flowmeter (45-1) and the second gas flowmeter (45-2)
Gas after amount is measured through total gas couette meter (45-0).
3. coal bed gas commingling production air water two phase fluid flow experimental provision according to claim 2, which is characterized in that the system
System pressure control component includes the back-pressure valve (47) for applying back pressure to system and the flow controller for controlling gas flow
(48)；Level pressure recovery process or constant flow recovery process are simulated respectively.
4. coal bed gas commingling production air water two phase fluid flow experimental provision according to claim 1-3, feature exist
In the rock core simulated assembly includes core holding unit (32)；
The inner cavity of the core holding unit (32) is provided with the rock core chamber (321) for accommodating rock core, and is set to the rock core chamber
(321) the confining pressure chamber (323) that the axis of two sides presses chamber (322) and is set to rock core chamber (321) periphery；
The pressure-loaded component includes controlling the axis respectively to press the axis pressure of chamber (322) and confining pressure chamber (323) pressure is automatic to add
Loading system (34) and confining pressure auto-loading system (33), so that the rock core obtains preset confining pressure and axis pressure.
5. coal bed gas commingling production air water two phase fluid flow experimental provision according to claim 4, which is characterized in that the rock
Heart simulated assembly further includes being set to insulating box (31) on the outside of the core holding unit (32), for acquiring the rock core clamping
The pressure sensor (35) of device (32) internal pressure, and the pressure difference biography for detecting the core holding unit (32) both ends pressure difference
Sensor (36).
6. coal bed gas commingling production air water two phase fluid flow experimental provision according to claim 1-5, feature exist
In the gas pressure control component includes gas booster pump (12), and the dielectric gas injected through gas source (11) passes through gas booster pump
(12) it is pressurized to goal pressure；
The gas pressure control component is also optionally provided with pressure reducing valve (17) and/or surge tank (14)；
The pressure reducing valve (17) is set to before the gas booster pump (12), the dielectric gas for will inject through gas source (11)
Carry out reduced pressure treatment；
The surge tank (14) is set to after the gas booster pump (12), for storing the medium gas for being pressurized to goal pressure
Body is with stable high voltage atmospheric pressure.
7. coal bed gas commingling production air water two phase fluid flow experimental provision according to claim 6, which is characterized in that the reality
Experiment device further includes the pumped vacuum systems (2) before being set to the model system (3), for the rock in model system (3)
Heart sample carries out vacuumize process, so that dielectric gas and core sample come into full contact with absorption.
8. a kind of coal bed gas commingling production air water two phase fluid flow carried out based on any one of the claim 1-7 experimental provision is real
Test method for testing, which comprises the steps of:
S1, connecting test pipeline, and the core sample of selected size is packed into the core holding unit in (32), described in opening
Pumped vacuum systems (2) will realize vacuumize process in the model system (3), be then situated between by gas injection system (1) injection
Matter gas makes dielectric gas filling, is adsorbed in the crack and hole of core sample, then in the core holding unit (32)
Water flooding is injected, the saturated aqueous environment of subsurface reservoir is simulated；
S2, according to actual formation condition, respectively by the confining pressure loading system (33) and axis pressure loading system (34) respectively to
The rock core chamber (321) in the core holding unit (32) applies the confining pressure and axis pressure of setting；And pass through the insulating box
(31) the rock core chamber (321) is heated, to simulate actual reservoir temperature；
S3, the back pressure that system is set by the back-pressure valve (47) in the metering system (4), or pass through the flow control
Gas flow in device (48) setting system processed, to simulate level pressure decaying exploitation or constant flow decaying exploitation respectively；
S4, by the injected system (1), pressed in the core holding unit (32) of Xiang Suoshu model system (3) according to setting
Power injected media gas；By the water flowing in rock core chamber (321) described in displacement after gas injection, and the shape inside each rock core
At air-water two phase flow body, and by the pressure sensor (35) and differential pressure pickup (36), record air water flowing is along stroke pressure
Variation；
After S5, air-water two phase flow body flow out the core holding unit (32), into the metering system (4), and pass through the gas
Liquid/gas separator (41) realizes gas and water two-phase laminated flow, and the water after separation enters in the graduated cylinder (43) metering for realizing water flow；And
Gas after separation then enters gas flowmeter and realizes gas dosing；
S6, until water does not flow, throughput terminates experiment after stablizing, and carries out data processing, obtains simulated experiment result.
9. coal bed gas commingling production air water two phase fluid flow experimental test procedures according to claim 8, which is characterized in that institute
It states in step S5, the gas dosing step includes with the first gas flowmeter (45-1) to through the gas-liquid separator
(41) gas the step of being measured after separating, with the second gas flowmeter (45-2) to by other components from and flow backward
Enter the step of gas of the gas-liquid separator (41) is measured, and in terms of the total gas couette (45-0) described in warp
Gas after first gas flowmeter (45-1) and the second gas flowmeter (45-2) metering carries out gas gross metering
Step.
10. coal bed gas commingling production air water two phase fluid flow experimental test procedures according to claim 8 or claim 9, feature exist
In further including carrying out being pressurized to goal pressure by gas booster pump (12) to the dielectric gas of injection in the step S4
Step, and the step of selective injection surge tank (14) carries out steady pressure treatment.
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