CN103674799B - The device and method of a kind of mensurated gas composition axial diffusion coefficient in porous medium - Google Patents
The device and method of a kind of mensurated gas composition axial diffusion coefficient in porous medium Download PDFInfo
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- CN103674799B CN103674799B CN201210315201.1A CN201210315201A CN103674799B CN 103674799 B CN103674799 B CN 103674799B CN 201210315201 A CN201210315201 A CN 201210315201A CN 103674799 B CN103674799 B CN 103674799B
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Abstract
The invention provides the device and method of a kind of mensurated gas composition axial diffusion coefficient in porous medium, belong to oil-gas field development field.Described device comprises constant temperature oil bath (1) and is arranged on clamper (2), container (16) and the gas cylinder (11) in constant temperature oil bath (1); Lead sleeve (4) is installed in described clamper (2), the tubular structure that described lead sleeve (4) is both ends open, in one end of lead sleeve (4), plug (3) is housed, the other end is equipped with band valve plug (7); The external cylindrical surface of described plug (3) all seals with the inside surface of lead sleeve (4) with the external cylindrical surface of band valve plug (7) and contacts; The inner chamber of the lead sleeve (4) between described plug (3) and band valve plug (7) forms sample cavity, and porous medium (5) is housed in described sample cavity.
Description
Technical field
The invention belongs to oil-gas field development field, be specifically related to the device and method of a kind of mensurated gas composition axial diffusion coefficient in porous medium.
Background technology
Measurement gas diffusion coefficients method in a liquid in current document, these methods are divided into two classes in general: direct method and indirect method.No matter be direct or indirect inspection, all can only describe gas concentration in the liquid phase diffusing capacity in other words, and directly can not measure the coefficient of diffusion of gas.
(1) direct method: in different time and the sampling of different diffusion length convection cells, then these samples are analyzed, obtain the concentration data of gas, then in conjunction with corresponding mathematical model, derive coefficient of diffusion.But the process of sampling disturbs the flow field in system, thus causes the error of experiment.
(2) indirect method: NMR (nuclear magnetic resonance) and PVT (pressure-volume-temperature (PVT)) method are two kinds of most widely used indirect measurement methods, and relative to direct measurement, this method does not need the analysis sampling and carry out to sample.NMR method directly can measure the concentration of gas in enclosed system by NMR (Nuclear Magnetic Resonance) spectrum, but the price of costliness is most of laboratory, and institute is unaffordable.PVT method is a kind of more conventional method, and this method only needs an airtight container or glass-micropipe to hold gas and the liquid of test.
For the coefficient of diffusion of gas in the porous medium of saturated fluid, do not have shaping determinator and assay method at present, have many scholars to attempt adopting various method to measure, Guo Biao etc. determine CO
2coefficient of diffusion in the porous medium of saturation simulation salt solution, its porous medium adopted be appear sand fill empirical model, first this model is vacuumized, saturation simulation salt solution, then pumps into CO under constant-pressure conditions
2, CO under metering different time
2cumulative injection, the termination of pumping when cumulative injection is constant in 1h, obtains the slope of injection rate IR and time subduplicate relation by mapping, and then can calculate coefficient of diffusion.Its experimental provision adopted cannot carry out the mensuration of gas diffusivity in true core.ZhaowenLi determines the coefficient of diffusion of gas in the porous medium distinguishing saturated crude oil or salt solution, its porous medium adopted is true core, shut with the two ends of epoxy resin by rock core, then saturated crude oil or salt solution is distinguished, gas enters porous medium by core column side diffusion, this diffusion process is radial diffusion process, by the pressure change under record different time, pressure versus time data are substituted into the model of specifying and calculates coefficient of diffusion, it lacks determinator and the assay method of gas axial diffusion coefficient in true core.China people republic oil and gas industry standard SY/T6129-1995 has formulated hydrocarbon gas diffusion coefficients standard in rock, this standard is by being fixed in clamper by rock core, diffuser casing at rock core two ends passes into nitrogen and hydrocarbon gas respectively, the composition of two ends gas under different time condition is measured respectively by gas chromatography, can obtain the coefficient of diffusion of hydrocarbon gas at porous medium by process, the shortcoming of the method has be under the condition that lack gas chromatography be difficult to realize at two: one; Two is by damage spreading balance causing comparatively big experiment error to two ends diffuser casing gas sample.
Summary of the invention
The object of the invention is to solve the difficult problem existed in above-mentioned prior art, the device and method of a kind of mensurated gas composition axial diffusion coefficient in porous medium is provided, mensurated gas composition is axial diffusion coefficient in the porous medium of saturated fluid, by record gaseous tension over time, specific mathematical model is utilized can to obtain the coefficient of diffusion of gas in the porous medium of saturated fluid.
The present invention is achieved by the following technical solutions:
Clamper 2, container 16 and gas cylinder 11 that a kind of mensurated gas composition device of axial diffusion coefficient in porous medium comprises constant temperature oil bath 1 and is arranged in constant temperature oil bath 1;
In described clamper 2, be provided with lead sleeve 4, described lead sleeve 4 is the tubular structure of both ends open, in one end of lead sleeve 4, plug 3 is housed, and the other end is equipped with band valve plug 7;
The external cylindrical surface of described plug 3 all seals with the inside surface of lead sleeve 4 with the external cylindrical surface of band valve plug 7 and contacts;
The inner chamber of the lead sleeve 4 between described plug 3 and band valve plug 7 forms sample cavity, and porous medium 5 is housed in described sample cavity.
Described plug 3 is connected with one end of plug connecting rod, the other end of described plug connecting rod stretches out described clamper 2 and is fixed on described clamper 2;
Described plug 3 has two with the through hole of its axis being parallel; One of them through hole is connected with the vacuum-pumping valve 14 be positioned at outside clamper 2 by pipeline, this through hole makes sample chamber be communicated with vacuum-pumping valve 14, another through hole is connected by pipeline one end with the valve 15 be positioned at outside clamper 2, this through hole makes sample chamber be communicated with valve 15, one end of the other end connecting container 16 of described valve 15, the other end of described container 16 is connected with the constant voltage injection pump 18 be positioned at outside constant temperature oil bath 1 by injecting valve 17.
Described band plug valve 7 is inner end near one end of sample cavity, and the other end is outer end, and the inner cylinder face of described outer end, inner end and band plug valve 7 surrounds a cavity, and this cavity is gas diffusion chamber 13;
Described inner end is provided with diffusion valve 6, and described diffusion valve 6 controls being communicated with of described sample cavity and gas diffusion chamber 13, if namely diffusion valve 6 is opened, then sample cavity is communicated with gas diffusion chamber 13, otherwise sample cavity and gas diffusion chamber 13 are disconnected;
The switch of described diffusion valve 6 is controlled by valve handle 9, and one end of described valve handle 9 is positioned at described diffusion valve 6 place, and the other end through the outer end and the clamper 2 that pass band valve plug 7 after gas diffusion chamber 13, and is arranged on described clamper 2; Like this, lead sleeve 4 is arranged in clamper 2 by the valve handle 9 on the plug connecting rod on plug 3 and band valve plug 7.
The outer end of described band valve plug 7 is provided with and two of its axis being parallel through holes, one of them through hole connects the pressure transducer 8 be positioned at outside constant temperature oil bath 1 by pipeline, this through hole makes gas diffusion chamber 13 be communicated with pressure transducer 8, described pressure transducer 8 is for detecting the gaseous tension in gas diffusion chamber 13, another through hole connects the gas cylinder 11 be positioned at outside clamper 2 by high pressure valve 10, this through hole makes gas diffusion chamber 13 be communicated with high pressure valve 10.
The inner end of described band valve plug 7 and the end face of porous medium 5 contact position are provided with diversion trench, and the ratio that the area of described diversion trench accounts for this face area is greater than the Areal porosity of the end face of porous medium 5.
If the length of porous medium 5 is L, described plug 3 thickness is M, and the thickness of described band valve plug 7 is N, then L, M and N sum is less than the length of lead sleeve 4.
A kind ofly utilize the device of described mensurated gas composition axial diffusion coefficient in porous medium to carry out method for measuring to comprise the following steps:
(A) under experimental temperature and experimental pressure condition, porous medium saturated fluid process;
(B) under experimental temperature and experimental pressure condition, gas diffusion process.
Described step (A) comprises the following steps:
(A1) valve handle 9 is used to close diffusion valve 6, isolated porous medium 5 and diffusion gas room 13;
(A2) set temperature in constant temperature oil bath 1 as specifying experimental temperature, constant temperature makes the temperature stabilization of whole device for 4 hours;
(A3) valve-off 15, opens vacuum-pumping valve 14, utilizes vacuum pump to vacuumize 24 hours from vacuum-pumping valve 14 to whole porous medium 5;
(A4) vacuum-pumping valve 14 is closed, open valve 15 and inject valve 17, constant voltage injection pump 18 is utilized to be injected in porous medium 5 by the fluid in container 16 by valve 15, keep 3 days under constant voltage to experimental pressure, this keeps valve 15 always and injects valve 17 in 3 days are the states opened;
(A5) valve-off 15, porous medium saturated fluid process terminates.
Described step (B) comprises the following steps (namely carrying out step below after valve-off 15):
(B1) open high pressure valve 10, gas cylinder 11 to diffusion gas room 13 insufflation gas, when pressure arrives experimental pressure, closes high pressure valve 10 by high pressure valve 10;
(B2) utilize valve handle 9 to open diffusion valve 6, utilize pressure transducer 8 to record pressure under different time in gas diffusion chamber 13, the gas now in gas diffusion chamber 13 is spread to porous medium 5 by diffusion valve 6 simultaneously;
(B3) record experimental data, the force value (i.e. pressure versus time) namely under different time, when experimental pressure remained unchanged in 1 hour, stop experiment;
(B4) experimental data is processed, try to achieve gas axial diffusion coefficient in the porous medium of saturated fluid.
Described step (B4) specifically comprises the following steps:
(B41) with the difference of the pressure recorded in the original pressure of testing and experimentation for the longitudinal axis, with the subduplicate difference of the square root of experimental period and initial time for transverse axis, experimental data is plotted in rectangular coordinate system, again linear fit is carried out to the experimental data in rectangular coordinate system and obtain straight line, then try to achieve the slope k of this straight line;
(B42) slope k of described straight line is brought in formula below, obtain the axial diffusion coefficient D of gas in the porous medium of saturated fluid
aB:
Wherein, P
0for original pressure the pressure of gas diffusion chamber 13 (when namely experiment starts), the pressure that P is experimental period when being t, Z
gbe Gas Compression Factor, R is ideal gas constant, and T is experimental temperature, x
eqbe the balance interfacial concentration of oil gas interface, V is the volume of gas phase, A
cross sectionfor the face area of porous medium, φ is factor of porosity, and τ is tortuosity, D
aBbe axial diffusion coefficient, t tests the time of carrying out, t
0it is the time that diffusion starts, in these parameters, except D
aB, other parameters are all known (that is except D
aB, in this formula, other parameters are all known, just can in the hope of D by k
aB).
Compared with prior art, the invention has the beneficial effects as follows:
(1) under present invention achieves temperature, pressure condition, porous medium saturated fluid process is connected with the original position of gas diffusion process, avoid the fluid expansion loss in porous medium taking-up process, simultaneously original position connection procedure can simulating oil deposit condition completely, improves experiment accuracy;
(2) present invention achieves the axial diffusion of gas in the porous medium of saturated fluid, the process of this invention can the diffusion process of simulated injection gas in porous medium, record coefficient of diffusion and characterize the diffusivity of gas in porous medium under reservoir condition, Data support can be provided for numerical reservoir simulation;
(3) the present invention adopts pressure versus time data to calculate coefficient of diffusion, ensure that the mass conservation of system, avoids the shortcoming adopting sampling method to destroy system balance, make coefficient of diffusion result of calculation more accurate.
(4) utilize the present invention can measure gas drive and improve the coefficient of diffusion of injected gas in porous medium in oil recovery process, for numerical reservoir simulation provides Data support, optimize gas drive and improve oil recovery mining site conceptual design, improve in recovery ratio process in gas drive and there is very important application and wide prospect.
Accompanying drawing explanation
Fig. 1 is the structural representation of mensurated gas composition of the present invention device of axial diffusion coefficient in porous medium.
Fig. 2 is the mathematical model that in the method for mensurated gas composition of the present invention axial diffusion coefficient in porous medium, data processing adopts.
Fig. 3 is the experimental data figure in the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail:
The present invention is a kind of gas axial diffusion coefficients device and assay method in the porous medium of saturated fluid, under measuring temperature, pressure condition by this device, gas is axial diffusion coefficient in the porous medium of saturated fluid, and the coefficient of diffusion obtained can provide Data support for numerical reservoir simulation.The present invention is divided into following two parts: Part I, under temperature, pressure condition, and porous medium saturated fluid process; Part II, under temperature, pressure condition, gas diffusion process, whole invention achieves saturated with fluid and is connected with the original position of gas diffusion process, and its axial diffusion mode is more close to reservoir formation condition, and the pressure versus time data recording fashion of employing is simple, accurate.
Apparatus of the present invention as shown in Figure 1, comprise constant temperature oil bath 1 and the clamper 2, container 16 and the gas cylinder 11 that are arranged in constant temperature oil bath 1;
In described clamper 2, be provided with lead sleeve 4, described lead sleeve 4 is the tubular structure of both ends open, in one end of lead sleeve 4, plug 3 is housed, and the other end is equipped with band valve plug 7;
The external cylindrical surface of described plug 3 all seals with the inside surface of lead sleeve 4 with the external cylindrical surface of band valve plug 7 and contacts;
The inner chamber of the lead sleeve 4 between described plug 3 and band valve plug 7 forms sample cavity, and porous medium 5 is housed in described sample cavity.
Described plug 3 is connected with one end of plug connecting rod, the other end of described plug connecting rod stretches out described clamper 2 and is fixed on described clamper 2;
Described plug 3 has two with the through hole of its axis being parallel; One of them through hole is connected with the vacuum-pumping valve 14 be positioned at outside clamper 2 by pipeline, this through hole makes sample chamber be communicated with vacuum-pumping valve 14, another through hole is connected by pipeline one end with the valve 15 be positioned at outside clamper 2, this through hole makes sample chamber be communicated with valve 15, one end of the other end container 16 of described valve 15, the other end of described container 16 is connected with the constant voltage injection pump 18 be positioned at outside constant temperature oil bath 1 by injecting valve 17.
Described band plug valve 7 is inner end near one end of sample cavity, and the other end is outer end, and the inner cylinder face of described outer end, inner end and band plug valve 7 surrounds a cavity, and this cavity is gas diffusion chamber 13; ;
Described inner end is provided with diffusion valve 6, and described diffusion valve 6 controls being communicated with of described sample cavity and gas diffusion chamber 13, if namely diffusion valve 6 is opened, then sample cavity is communicated with gas diffusion chamber 13, otherwise sample cavity and gas diffusion chamber 13 are disconnected;
The switch of described diffusion valve 6 is controlled by valve handle 9, and described valve handle 9 one end is positioned at described diffusion valve 6 place, and the other end through the outer end and the clamper 2 that pass band valve plug 7 after gas diffusion chamber 13, and is arranged on described clamper 2; Like this, lead sleeve 4 is arranged in clamper 2 by the valve handle 9 on plug 3 upper plug head connecting rod and band valve plug 7.
The outer end of band valve plug 7 is provided with and two of its axis being parallel through holes, one of them through hole connects the pressure transducer 8 be positioned at outside constant temperature oil bath 1 by pipeline, gas diffusion chamber 13 is communicated with pressure transducer 8, described pressure transducer 8 is for detecting the gaseous tension in gas diffusion chamber 13, another through hole connects the gas cylinder 11 be positioned at outside clamper 2 by high pressure valve 10, gas diffusion chamber 13 is communicated with high pressure valve 10.
The inner end of described band valve plug 7 and the end face of porous medium 5 contact position are provided with diversion trench, and the ratio that the area of described diversion trench accounts for this face area is greater than the Areal porosity of the end face of porous medium 5.
If the length of porous medium 5 is L, described plug 3 thickness is M, and the thickness of described band valve plug 7 is N, then L, M and N sum is less than the length of lead sleeve 4.
With an embodiment, the present invention is described below:
Certain oil field core parameters is as shown in table 1, and this crude oil density is 0.87g/cm
3, viscosity is 20.1mPas, and first four pieces of rock core splicings are become long cores by experimentation, and the periphery of long cores adopts thermal shrinkable sleeve to fix.
| Rock core | 1# | 2# | 3# | 4# |
| Diameter/cm | 2.401 | 2.414 | 2.397 | 2.449 |
| Length/cm | 5.854 | 3.287 | 5.843 | 5.74 |
| Tortuosity | 7.1375 | 3.2359 | 1.1505 | 2.3341 |
| Factor of porosity | 18.38 | 19.61 | 18.39 | 19.18 |
Table 1
Device flow process Connection Step is as follows:
(1) be that the rock core (i.e. porous medium 5) of L puts into lead sleeve 4 by the length of having spliced, shut by one end plug 3 of described lead sleeve 4, described plug 3 thickness is M;
(2) put into band valve plug 7 at the other end of described lead sleeve 4, its thickness is N, guarantees that L, M and N sum is less than the length of lead sleeve 4;
(3) then pressure transducer 8 is connected on band valve plug 7, will high pressure CO be connected with simultaneously
2the gas injection pipeline of gas cylinder (i.e. gas cylinder 11) is connected on band valve plug 7 by high pressure valve 10;
(4) vacuum-pumping valve 14 is connected on plug 3 by pipeline, the pipeline being connected with container 16 is connected on plug 3 by valve 15 simultaneously, in container 16, fills crude oil or other (such as local water) fluid (needing to test what fluid just what fluid saturated) for saturated porous medium 5;
(5) lead sleeve 4 connecting two plugs is put into clamper 2, the two ends of clamper 2 are shut, guarantee that lead sleeve 4 and clamper annular space 12 are filled with no seepage and no leakage after water under high pressure;
(6) their (except pressure transducers 8) are placed in constant temperature oil bath 1.
Experimental procedure:
Experimentation is divided into two parts: the first, under reservoir condition, and rock core saturated fluid process; The second, under reservoir condition, gas diffusion process.
Part I: under reservoir condition, rock core saturated fluid process experiment step
(1) valve handle 9 is used to close diffusion valve 6, isolated rock core and diffusion gas room 13;
(2) temperature setting oil bath 1 is experimental temperature 97.53 DEG C, constant temperature 4h, and whole system temperature is stablized;
(3) valve-off 15, opens vacuum-pumping valve 14, utilizes vacuum pump from vacuum-pumping valve 14 to whole rock core vacuumizing 24h;
(4) close vacuum-pumping valve 14, open valve 15, utilize constant pressure pump 18 that the crude oil in container 16 is injected rock core 5, constant voltage keeps 3 days to experimental pressure 7MPa;
(5) valve-off 15, rock core saturated fluid process terminates.
Part II: under reservoir condition, gas diffusion process experimental procedure
(1) open high pressure valve 10, be filled with CO to gas diffusion chamber 13
2gas, when pressure arrives experimental pressure 7MPa, closes high pressure valve 10;
(2) utilize valve handle 9 to open diffusion valve 6, utilize pressure transducer 8 to record gas system pressure under different time, the CO now in gas diffusion chamber 13 simultaneously
2spread in rock core by diffusion valve 6;
(3) experimental pressure-time data is recorded, until remain unchanged in experimental pressure 1h;
(4) adopt data processing method of the present invention to process experimental data, try to achieve CO
2axial diffusion coefficient in the rock core of saturated crude oil.
Data processing step is as follows:
One, mathematical model:
The ONE-DIMENSIONAL METHOD that the present invention adopts calculates the mathematical model of coefficient of diffusion, and as shown in Figure 2, model horizontal positioned, left end is closed, and right-hand member is opened to pass into gas, take endpiece as true origin z=0, is z-axis positive dirction along the direction to entrance, and length is z
0.Model sidewall is no-flow boundary, make gas can only in model diffusion And Movement.
Two, mathematical model hypothesis:
(1) coefficient of diffusion of gas in porous medium is constant in the process measured;
(2) pore media homogeneous;
(3) Effect of Nature Convection of gas in porous medium is ignored, and because model horizontal positioned makes convection action very weak, therefore can not consider;
(4) disregard gas and diffuse into the convective mass transfer that the liquid phase swell increment, density of liquid phase and the volume change that cause in liquid phase cause;
(5) amount that liquid phase evaporation enters gas phase is ignored.
Three, the derivation of diffusivity expression
According to Fick's second law
Wherein: x: the concentration of gas in porous medium in fluid; D
aB: coefficient of diffusion; T: diffusion time.Do not have gas to enter in porous medium when just starting owing to testing, therefore starting condition is:
0≤z≤z
0，t＝0，x＝0
Boundary condition is:
z＝z
0，t＞0，x＝x
eq
Z=0, in all t,
X
eq: the balance interfacial concentration of oil gas interface, it changes along with temperature and pressure change, because experiment condition is constant temperature, x
eqonly change along with the change of pressure;
Fick's second law can be obtained it and separate, and namely concentration is the function of time and position
System pressure and diffusion process are combined by material balance calculation, the amount of substance that namely gas phase reduces equals the amount of substance of the gas phase by liquid-gas interface.
Wherein V: the volume of gas phase; Z
g: Gas Compression Factor; R: ideal gas constant; T: experimental temperature; P: experimental pressure; A gas diffusion face area.
Can obtain by deriving
Wherein, t
0: the time that diffusion starts; P
0: the pressure that diffusion starts; T: test the time of carrying out; P: pressure when experimental period is t;
Because in porous medium diffusion coefficients process, gas liquid interfacial area is obtained by factor of porosity φ and tortuosity τ.Tortuosity is defined as the ratio of actual length that fluid in porous medium passes through and macro length, and its expression formula is
if A is the area that gas contacts with duct, A
cross sectionfor the face area of porous medium, its pass is
So
for coefficient of diffusion formula.
Data processing step is as follows:
(1) to test the difference of original pressure and experimentation record pressure for the longitudinal axis, with experimental period square root and the subduplicate difference of initial time for transverse axis, experimental data is plotted in rectangular coordinate system, try to achieve straight slope k=6.868, as shown in Figure 3 (for the slope of straight line, the square root of employing time and the square root of experimental period are the same with the subduplicate difference of initial time, such as y=ax and y=a (x+b), article two, the slope of straight line is the same, and just intercept is different).
(2) according to described coefficient of diffusion formula, bring straight slope k into formula, other parameters in table 2,
Obtain the axial diffusion coefficient D of gas in the porous medium of saturated fluid
aB=0.001041537cm
2/ s.
Table 2
The present invention can the coefficient of diffusion of analog gas in true core, and the true core adopted in experimentation is more close to actual formation condition, and the mensuration of coefficient of diffusion is more accurate.Present invention achieves saturated with fluid to be connected with the original position of diffusion process, reduce experimental error.
What this invention measured is the axial diffusion coefficient of gas in porous medium, and compared with radial diffusion coefficient, axial diffusion coefficient is more close to actual stratum diffusion conditions, and its diffusion coefficient data calculated is more accurate.Present invention achieves saturated with fluid to be connected with the original position of diffusion process, reduce experimental error.
These invention record pressure versus time data, calculate coefficient of diffusion by these data, avoid the experimental error that gas sample causes, and experimentation is simple, accurate.Present invention achieves saturated with fluid to be connected with the original position of diffusion process, reduce experimental error.
Technique scheme is one embodiment of the present invention, for those skilled in the art, on the basis that the invention discloses application process and principle, be easy to make various types of improvement or distortion, and the method be not limited only to described by the above-mentioned embodiment of the present invention, therefore previously described mode is just preferred, and does not have restrictive meaning.
Claims (8)
1. a device for mensurated gas composition axial diffusion coefficient in porous medium, is characterized in that: described device comprises constant temperature oil bath (1) and is arranged on clamper (2), container (16) and the gas cylinder (11) in constant temperature oil bath (1);
Lead sleeve (4) is installed in described clamper (2), the tubular structure that described lead sleeve (4) is both ends open, in one end of lead sleeve (4), plug (3) is housed, the other end is equipped with band valve plug (7);
The external cylindrical surface of described plug (3) all seals with the inside surface of lead sleeve (4) with the external cylindrical surface of band valve plug (7) and contacts;
The inner chamber of the lead sleeve (4) between described plug (3) and band valve plug (7) forms sample cavity, and porous medium (5) is housed in described sample cavity;
The upper one end near sample cavity of described band plug valve (7) is inner end, the other end is outer end, described outer end, inner end and band plug valve (7) inner cylinder face surround a cavity, this cavity is gas diffusion chamber (13); Described inner end is provided with diffusion valve (6), and described diffusion valve (6) controls being communicated with of described sample cavity and gas diffusion chamber (13);
Plug (3) has the first through hole with its axis being parallel, first through hole is connected by pipeline one end with the valve (15) being positioned at clamper (2) outside, one end of the other end connecting container (16) of valve (15);
The outer end of described band valve plug (7) is provided with the second through hole with its axis being parallel, and the second through hole connects the gas cylinder (11) being positioned at clamper (2) outside by high pressure valve (10).
2. the device of mensurated gas composition according to claim 1 axial diffusion coefficient in porous medium, it is characterized in that: the one end described plug (3) being connected with plug connecting rod, the other end of described plug connecting rod stretches out described clamper (2) and is fixed on described clamper (2);
Described plug (3) also has the third through-hole with its axis being parallel, and third through-hole is connected with the vacuum-pumping valve (14) being positioned at clamper (2) outside by pipeline;
The other end of described container (16) is connected with the constant voltage injection pump (18) being positioned at constant temperature oil bath (1) outside by injecting valve (17).
3. the device of mensurated gas composition according to claim 2 axial diffusion coefficient in porous medium, is characterized in that:
The switch of described diffusion valve (6) is controlled by valve handle (9), one end of described valve handle (9) is positioned at described diffusion valve (6) place, the other end through the outer end and the clamper (2) that pass band valve plug (7) after gas diffusion chamber (13), and is arranged on described clamper (2).
4. the device of mensurated gas composition according to claim 3 axial diffusion coefficient in porous medium, it is characterized in that: on the outer end of described band valve plug (7), be also provided with the fourth hole with its axis being parallel, fourth hole connects the pressure transducer (8) being positioned at constant temperature oil bath (1) outside by pipeline.
5. the device of mensurated gas composition according to claim 4 axial diffusion coefficient in porous medium, it is characterized in that: the inner end of described band valve plug (7) and the end face of porous medium (5) contact position are provided with diversion trench, the ratio that the area of described diversion trench accounts for this face area is greater than the Areal porosity of the end face of porous medium (5).
6. the device of mensurated gas composition according to claim 5 axial diffusion coefficient in porous medium, it is characterized in that: set the length of porous medium (5) as L, described plug (3) thickness is M, the thickness of described band valve plug (7) is N, then L, M and N sum is less than the length of lead sleeve (4).
7. utilize the device of the axial diffusion coefficient in porous medium of mensurated gas composition described in claim 6 to carry out a method for measuring, it is characterized in that: said method comprising the steps of:
(A) under experimental temperature and experimental pressure condition, porous medium saturated fluid process;
(B) under experimental temperature and experimental pressure condition, gas diffusion process;
Wherein, described step (A) comprises the following steps:
(A1) valve handle (9) is used to close diffusion valve (6), isolated porous medium (5) and diffusion gas room (13);
(A2) set temperature in constant temperature oil bath (1) as specifying experimental temperature, constant temperature makes the temperature stabilization of whole device for 4 hours;
(A3) valve-off (15), opens vacuum-pumping valve (14), utilizes vacuum pump to vacuumize 24 hours from vacuum-pumping valve (14) to whole porous medium (5);
(A4) vacuum-pumping valve (14) is closed, open valve (15) and inject valve (17), constant voltage injection pump (18) is utilized to be injected in porous medium (5) by the fluid in container (16) by valve (15), keep 3 days under constant voltage to experimental pressure, this keeps valve (15) always and injects valve (17) in 3 days be the state opened;
(A5) valve-off (15), porous medium saturated fluid process terminates;
Described step (B) comprises the following steps:
(B1) high pressure valve (10) is opened, gas cylinder (11) by high pressure valve (10) to diffusion gas room (13) insufflation gas, when pressure arrives experimental pressure, close high pressure valve (10);
(B2) valve handle (9) is utilized to open diffusion valve (6), utilize pressure transducer (8) to record pressure under different time in gas diffusion chamber (13), the gas now in gas diffusion chamber (13) is spread to porous medium (5) by diffusion valve (6) simultaneously;
(B3) record experimental data, the force value namely under different time, when experimental pressure remained unchanged in 1 hour, stop experiment;
(B4) experimental data is processed, try to achieve gas axial diffusion coefficient in the porous medium of saturated fluid.
8. method according to claim 7, is characterized in that: described step (B4) specifically comprises the following steps:
(B41) with the difference of the pressure recorded in the original pressure of testing and experimentation for the longitudinal axis, with the subduplicate difference of the square root of experimental period and initial time for transverse axis, experimental data is plotted in rectangular coordinate system, again linear fit is carried out to the experimental data in rectangular coordinate system and obtain straight line, then try to achieve the slope k of this straight line;
(B42) slope k of described straight line is brought in formula below, obtain the axial diffusion coefficient D of gas in the porous medium of saturated fluid
aB:
Wherein, P
0for original pressure, the pressure that P is experimental period when being t, Z
gbe Gas Compression Factor, R is ideal gas constant, and T is experimental temperature, x
eqbe the balance interfacial concentration of oil gas interface, V is the volume of gas phase, A
cross sectionfor the face area of porous medium, φ is factor of porosity, and τ is tortuosity, D
aBbe axial diffusion coefficient, t tests the time of carrying out, t
0it is the time that diffusion starts, in these parameters, except D
aB, other parameters are all known.
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|---|---|---|---|
| CN201210315201.1A CN103674799B (en) | 2012-08-30 | 2012-08-30 | The device and method of a kind of mensurated gas composition axial diffusion coefficient in porous medium |
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| CN201210315201.1A CN103674799B (en) | 2012-08-30 | 2012-08-30 | The device and method of a kind of mensurated gas composition axial diffusion coefficient in porous medium |
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| CN103674799B true CN103674799B (en) | 2015-12-02 |
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