CN103674799A - Device and method for measuring axial diffusion coefficient of gas in porous medium - Google Patents
Device and method for measuring axial diffusion coefficient of gas in porous medium Download PDFInfo
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- CN103674799A CN103674799A CN201210315201.1A CN201210315201A CN103674799A CN 103674799 A CN103674799 A CN 103674799A CN 201210315201 A CN201210315201 A CN 201210315201A CN 103674799 A CN103674799 A CN 103674799A
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Abstract
The invention provides a device and a method for measuring an axial diffusion coefficient of gas in a porous medium and belongs to the field of oil-gas field development. The device comprises a constant temperature oil bath (1), and a holder (2), a container (16) and a high pressure gas cylinder (11) which are arranged in the constant temperature oil bath (1), wherein a lead sleeve (4) is arranged in the holder (2) and is in a cylindrical structure of which two ends are open; a plug (3) is arranged at one end of the lead sleeve (4), and a plug (7) with a valve is arranged at the other end of the lead sleeve (4); an outer cylindrical surface of the plug (3) and an outer cylindrical surface of the plug (7) with the valve are in sealing contact with an inner surface of the lead sleeve (4); a sample cavity is formed in an inner cavity of the lead sleeve (4) between the plug (3) and the plug (7) with the valve; a porous medium (5) is arranged in the 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
The coefficient of diffusion assay method of measurement gas in liquid in current document, these methods are divided into two classes in general: direct method and indirect method.No matter be directly or indirectly to measure, all can only describe the concentration of gas in liquid phase diffusing capacity in other words, and can not directly measure the coefficient of diffusion of gas.
(1) direct method: in different time and different diffusion length convection cell samplings, then these samples are analyzed, obtained the concentration data of gas, then in conjunction with corresponding mathematical model, derive coefficient of diffusion.But the process of sampling has been disturbed the flow field in system, thereby cause 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, with respect to direct measurement, and the analysis that this method does not need sampling and samples.NMR method can directly be measured by NMR (Nuclear Magnetic Resonance) spectrum the concentration of gas in enclosed system, but expensive price is most of laboratories, 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 testing use.
Coefficient of diffusion for gas in the porous medium of saturated fluid, does not have determinator and the assay method of moulding at present, has many scholars to attempt adopting the whole bag of tricks to measure, and Guo Biao etc. have measured CO
2coefficient of diffusion in the porous medium of saturation simulation salt solution, its porous medium adopting is the empirical model that sand fills of appearing, and 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, termination of pumping when cumulative injection is constant in 1h, obtains the slope of injection rate IR and subduplicate relation of time, and then can calculate coefficient of diffusion by mapping.Its experimental provision adopting cannot carry out the mensuration of gas diffusivity in true core.Zhaowen Li has measured the coefficient of diffusion of gas in the porous medium of the saturated crude oil of difference or salt solution, its porous medium adopting is true core, with epoxy resin, the two ends of rock core are shut, then distinguish saturated crude oil or salt solution, gas enters porous medium by rock core post side diffusion, this diffusion process is radial diffusion process, by the pressure recording under different time, change, the model of pressure-time data substitution appointment is calculated to coefficient of diffusion, and it lacks determinator and the assay method of gas axial diffusion coefficient in true core.The China people oil and gas industry standard SY/T6129-1995 of republic has formulated hydrocarbon gas coefficient of diffusion bioassay standard in rock, this standard is by being fixed on rock core in clamper, diffuser casing at rock core two ends passes into respectively nitrogen and hydrocarbon gas, by gas chromatography, measure respectively the composition of two ends gas under different time condition, by processing, can obtain hydrocarbon gas at the coefficient of diffusion of porous medium, the shortcoming of the method has two: one, is difficult to realize lacking under the condition of gas chromatography; The 2nd, by two ends diffuser casing gas sample meeting damage spreading balance is caused to larger experimental error.
Summary of the invention
The object of the invention is to solve the difficult problem existing 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 recording gaseous tension over time, utilize specific mathematical model can obtain the coefficient of diffusion of gas in the porous medium of saturated fluid.
The present invention is achieved by the following technical solutions:
A kind of mensurated gas composition device of axial diffusion coefficient in porous medium 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;
In described clamper 2, lead sleeve 4 is installed, the tubular structure that described lead sleeve 4 is both ends open, is equipped with plug 3 in one end of lead sleeve 4, and the other end is equipped with band valve plug 7;
The external cylindrical surface of described plug 3 all contacts with the inside surface sealing of lead sleeve 4 with the external cylindrical surface with valve plug 7;
Described plug 3 and form sample cavity with the inner chamber of the lead sleeve 4 between valve plug 7 is equipped with porous medium 5 in described sample cavity.
On described plug 3, be 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;
On described plug 3, have two through holes parallel with its axis; One of them through hole is connected with the vacuum-pumping valve 14 that is positioned at clamper 2 outsides by pipeline, this through hole makes sample chamber be communicated with vacuum-pumping valve 14, another through hole is connected with the one end that is positioned at the valve 15 of clamper 2 outsides by pipeline, 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 that is positioned at constant temperature oil bath 1 outside by injecting valve 17.
It is described that with being inner end near one end of sample cavity on plug valve 7, the other end is outer end, described outer end, inner end and surround a cavity with the inner cylinder face of plug valve 7, and this cavity is gas diffusion chamber 13;
On described inner end, be provided with diffusion valve 6, the described sample cavity of described diffusion valve 6 control is communicated with gas diffusion chamber 13, if diffusion valve 6 is opened, sample cavity and gas diffusion chamber 13 are communicated with, 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 places, and the other end passes outer end and the clamper 2 with valve plug 7 through after gas diffusion chamber 13, and is arranged on described clamper 2; Like this, lead sleeve 4 is by the plug connecting rod on plug 3 and being arranged in clamper 2 with the valve handle 9 on valve plug 7.
On the described outer end with valve plug 7, be provided with two through holes parallel with its axis, one of them through hole connects the pressure transducer 8 that is positioned at constant temperature oil bath 1 outside by pipeline, this through hole makes gas diffusion chamber 13 be communicated with pressure transducer 8, described pressure transducer 8 is for detection of the gaseous tension in gas diffusion chamber 13, another through hole connects by high pressure valve 10 gas cylinder 11 that is positioned at clamper 2 outsides, and this through hole makes gas diffusion chamber 13 be communicated with high pressure valve 10.
The end face of the described inner end with valve plug 7 and porous medium 5 contact positions is provided with diversion trench, and the ratio that the area of described diversion trench accounts for this face area is greater than the face rate of the end face of porous medium 5.
If the length of porous medium 5 is L, described plug 3 thickness are M, and the described thickness with valve plug 7 is N, and L, M and N sum are less than the length of lead sleeve 4.
A kind of device that utilizes described mensurated gas composition axial diffusion coefficient in porous medium carries out method for measuring and comprises 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) use valve handle 9 to close diffusion valve 6, isolated porous medium 5 and diffusion gas chamber 13;
(A2) temperature of setting in constant temperature oil bath 1 is appointment experimental temperature, and constant temperature makes the temperature stabilization of whole device for 4 hours;
(A3) valve-off 15, open vacuum-pumping valve 14, utilize vacuum pump, from vacuum-pumping valve 14, whole porous medium 5 is vacuumized to 24 hours;
(A4) close vacuum-pumping valve 14, open valve 15 and inject valve 17, utilize constant voltage injection pump 18 that the fluid in container 16 is injected in porous medium 5 by valve 15, constant voltage keeps 3 days under experimental pressure, and in these 3 days, keeping valve 15 always and injecting valve 17 is states of opening;
(A5) valve-off 15, and porous medium saturated fluid process finishes.
Described step (B) comprises the following steps (being to carry out step below after valve-off 15):
(B1) open high pressure valve 10, gas cylinder 11 is filled with gas by high pressure valve 10 to diffusion gas chamber 13, when pressure arrives experimental pressure, closes high pressure valve 10;
(B2) utilize valve handle 9 to open diffusion valve 6, utilize pressure transducer 8 to record the pressure in gas diffusion chamber 13 under different time simultaneously, now the gas in gas diffusion chamber 13 spreads to porous medium 5 by diffusion valve 6;
(B3) record experimental data, the force value under different time (being pressure-time), when experimental pressure remained unchanged in 1 hour, stops experiment;
(B4) experimental data is processed, tried to achieve gas axial diffusion coefficient in the porous medium of saturated fluid.
Described step (B4) specifically comprises the following steps:
(B41) take the difference of the pressure that records in the original pressure of testing and experimentation is the longitudinal axis, take the square root of experimental period and the subduplicate difference of initial time is transverse axis, experimental data is plotted in rectangular coordinate system, again the experimental data in rectangular coordinate system is carried out to linear fit 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 (pressure of gas diffusion chamber 13 when experiment starts), P is the pressure of experimental period while 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 is the time that experiment is carried out, t
0it is the time that diffusion starts, in these parameters, except D
aB, other parameters are all known (that is to say except D
aB, in this formula, other parameters are all known, just can be in the hope of D by k
aB).
Compared with prior art, the invention has the beneficial effects as follows:
(1) the present invention has realized the original position of porous medium saturated fluid process and gas diffusion process under temperature, pressure condition and has been connected, avoided the fluid expansion loss in porous medium taking-up process, while original position connection procedure is simulating oil deposit condition completely, has improved experiment accuracy;
(2) the present invention has realized 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 characterized the diffusivity of gas in porous medium under reservoir condition, can provide Data support for numerical reservoir simulation;
(3) the present invention adopts pressure-time data to calculate coefficient of diffusion, has guaranteed the mass conservation of system, has avoided adopting sampling method to destroy the shortcoming of system balance, makes 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, optimized gas drive and improved oil recovery mining site conceptual design, in gas drive, improved in recovery ratio process 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 coefficient determinator and assay method in the porous medium of saturated fluid, by this device, measure under temperature, pressure condition, gas is axial diffusion coefficient in the porous medium of saturated fluid, and the coefficient of diffusion obtaining can provide Data support for numerical reservoir simulation.The present invention is divided into following two parts: first, and under temperature, pressure condition, porous medium saturated fluid process; Second portion, under temperature, pressure condition, gas diffusion process, the original position that whole invention has realized saturated with fluid and gas diffusion process is connected, and its axial diffusion mode approaches reservoir formation condition more, and pressure-time data recording mode of employing is simple, accurate.
Apparatus of the present invention as shown in Figure 1, comprise constant temperature oil bath 1 and are arranged on clamper 2, container 16 and the gas cylinder 11 in constant temperature oil bath 1;
In described clamper 2, lead sleeve 4 is installed, the tubular structure that described lead sleeve 4 is both ends open, is equipped with plug 3 in one end of lead sleeve 4, and the other end is equipped with band valve plug 7;
The external cylindrical surface of described plug 3 all contacts with the inside surface sealing of lead sleeve 4 with the external cylindrical surface with valve plug 7;
Described plug 3 and form sample cavity with the inner chamber of the lead sleeve 4 between valve plug 7 is equipped with porous medium 5 in described sample cavity.
On described plug 3, be 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;
On described plug 3, have two through holes parallel with its axis; One of them through hole is connected with the vacuum-pumping valve 14 that is positioned at clamper 2 outsides by pipeline, this through hole makes sample chamber be communicated with vacuum-pumping valve 14, another through hole is connected with the one end that is positioned at the valve 15 of clamper 2 outsides by pipeline, 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 that is positioned at constant temperature oil bath 1 outside by injecting valve 17.
It is described that with being inner end near one end of sample cavity on plug valve 7, the other end is outer end, described outer end, inner end and surround a cavity with the inner cylinder face of plug valve 7, and this cavity is gas diffusion chamber 13; ;
On described inner end, be provided with diffusion valve 6, the described sample cavity of described diffusion valve 6 control is communicated with gas diffusion chamber 13, if diffusion valve 6 is opened, sample cavity and gas diffusion chamber 13 are communicated with, 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 are positioned at described diffusion valve 6 places, and the other end passes outer end and the clamper 2 with valve plug 7 through after gas diffusion chamber 13, and is arranged on described clamper 2; Like this, lead sleeve 4 is by plug 3 upper plug head connecting rods and being arranged in clamper 2 with the valve handle 9 on valve plug 7.
On the outer end with valve plug 7, be provided with two through holes parallel with its axis, one of them through hole connects the pressure transducer 8 that is positioned at constant temperature oil bath 1 outside by pipeline, gas diffusion chamber 13 is communicated with pressure transducer 8, described pressure transducer 8 is for detection of the gaseous tension in gas diffusion chamber 13, another through hole connects by high pressure valve 10 gas cylinder 11 that is positioned at clamper 2 outsides, and gas diffusion chamber 13 is communicated with high pressure valve 10.
The end face of the described inner end with valve plug 7 and porous medium 5 contact positions is provided with diversion trench, and the ratio that the area of described diversion trench accounts for this face area is greater than the face rate of the end face of porous medium 5.
If the length of porous medium 5 is L, described plug 3 thickness are M, and the described thickness with valve plug 7 is N, and L, M and N sum are 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 experimentation becomes long rock core by four rock core splicings, and the periphery of long rock core adopts thermal shrinkable sleeve to fix.
| |
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) rock core that is L by the length of having spliced (being porous medium 5) is put into lead sleeve 4, and one end of described lead sleeve 4 is shut with plug 3, and described plug 3 thickness are M;
(2) at the other end of described lead sleeve 4, put into band valve plug 7, its thickness is N, guarantees that L, M and N sum are less than the length of lead sleeve 4;
(3) then pressure transducer 8 is connected on band valve plug 7, will be connected with high pressure CO simultaneously
2the gas injection pipeline of gas cylinder (being 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 that is 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) for the fluid (need to test what fluid with regard to saturated what fluid) of saturated porous medium 5;
(5) lead sleeve 4 that connects 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 to constant temperature oil bath 1.
Experimental procedure:
Experimentation is divided into two parts: the first, and under reservoir condition, rock core saturated fluid process; The second, under reservoir condition, gas diffusion process.
First: under reservoir condition, rock core saturated fluid process experiment step
(1) use valve handle 9 to close diffusion valve 6, isolated rock core and diffusion gas chamber 13;
(2) temperature of setting oil bath 1 is 97.53 ℃ of experimental temperatures, and constant temperature 4h makes whole system temperature stable;
(3) valve-off 15, open vacuum-pumping valve 14, utilize 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 to rock core 5, constant voltage keeps 3 days to experimental pressure 7MPa;
(5) valve-off 15, and rock core saturated fluid process finishes.
Second portion: under reservoir condition, gas diffusion process experimental procedure
(1) open high pressure valve 10, to gas diffusion chamber 13, be filled with CO
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, now the CO in gas diffusion chamber 13 simultaneously
2by diffusion valve 6, in rock core, spread;
(3) record experimental pressure-time data, 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 is calculated the mathematical model of coefficient of diffusion, as shown in Figure 2, model horizontal positioned, left end sealing, right-hand member opens to pass into gas, take endpiece as true origin z=0, along the direction to entrance, is z axle positive dirction, and length is z
0.Model sidewall is no-flow boundary, make gas can only be in model diffusion And Movement.
Two, mathematical model hypothesis:
(1) coefficient of diffusion of gas in porous medium is constant in the process of measuring;
(2) pore media homogeneous;
(3) Effect of Nature Convection of gas in porous medium ignored, 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: gas is the concentration in fluid in porous medium; D
aB: coefficient of diffusion; T: diffusion time.While just having started due to experiment, do not have gas to enter in porous medium, 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 is along with temperature and pressure changes and changes, because experiment condition is constant temperature, x
eqonly along with the variation of pressure, change;
Fick's second law can be obtained it and separate, and concentration is the function of time and position
By material balance calculation, system pressure and diffusion process are combined, the amount of substance that gas phase reduces equals by the amount of substance of the gas phase of liquid-gas interface.
V wherein: 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.
By deriving, can obtain
Wherein, t
0: the time that diffusion starts; P
0: the pressure that diffusion starts; T: the time that experiment is carried out; P: pressure when experimental period is t;
Because in porous medium coefficient of diffusion mensuration process, gas-liquid contact area is obtained by factor of porosity φ and tortuosity τ.Tortuosity is defined as true length that in porous medium, fluid passes through and the ratio of 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) take that to test the difference that original pressure and experimentation record pressure be the longitudinal axis, the subduplicate difference of experimental period square root and initial time of take is transverse axis, experimental data is plotted in to 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 is the same with the square root of experimental period 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 are 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 adopting in experimentation approaches actual formation condition more, and the mensuration of coefficient of diffusion is more accurate.The original position that the present invention has realized saturated with fluid and diffusion process is connected, and has reduced experimental error.
What this invention was measured is the axial diffusion coefficient of gas in porous medium, compares with radial diffusion coefficient, and axial diffusion coefficient approaches actual stratum diffusion conditions more, and the coefficient of diffusion data of its calculating are more accurate.The original position that the present invention has realized saturated with fluid and diffusion process is connected, and has reduced experimental error.
Pressure-time data is recorded in this invention, by these data, calculates coefficient of diffusion, the experimental error of having avoided gas sample to cause, and experimentation is simple, accurate.The original position that the present invention has realized saturated with fluid and diffusion process is connected, and has reduced experimental error.
Technique scheme is one embodiment of the present invention, for those skilled in the art, the invention discloses on the basis of application process and principle, be easy to make various types of improvement or distortion, and be not limited only to the described method of the above-mentioned embodiment of the present invention, therefore previously described mode is just preferred, and does not have restrictive meaning.
Claims (10)
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), and the tubular structure that described lead sleeve (4) is both ends open, is equipped with plug (3) in one end of lead sleeve (4), and the other end is equipped with band valve plug (7);
The external cylindrical surface of the external cylindrical surface of described plug (3) and band valve plug (7) all contacts with the inside surface sealing of lead sleeve (4);
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.
2. the device of mensurated gas composition according to claim 1 axial diffusion coefficient in porous medium, it is characterized in that: on described plug (3), be 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);
On described plug (3), have two through holes parallel with its axis; One of them through hole is connected with the vacuum-pumping valve (14) that is positioned at clamper (2) outside by pipeline, another through hole is connected with the one end that is positioned at the valve (15) of clamper (2) outside by pipeline, 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) that is 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, it is characterized in that: the upper one end near sample cavity of described band plug valve (7) is inner end, the other end is outer end, 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);
On described inner end, be provided with diffusion valve (6), described diffusion valve (6) is controlled being communicated with of described sample cavity and gas diffusion chamber (13);
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) and locates, the other end passes outer end and the clamper (2) of band valve plug (7) after passing 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 provided with two through holes parallel with its axis, one of them through hole connects the pressure transducer (8) that is positioned at constant temperature oil bath (1) outside by pipeline, another through hole connects the gas cylinder (11) that is positioned at clamper (2) outside by high pressure valve (10).
5. the device of mensurated gas composition according to claim 4 axial diffusion coefficient in porous medium, it is characterized in that: the end face of the inner end of described band valve plug (7) and porous medium (5) contact position is provided with diversion trench, the ratio that the area of described diversion trench accounts for this face area is greater than the face rate 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: the length of establishing porous medium (5) is L, described plug (3) thickness is M, the thickness of described band valve plug (7) is N, and L, M and N sum are less than the length of lead sleeve (4).
7. utilize the device of mensurated gas composition axial diffusion coefficient in porous medium 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.
8. method according to claim 7, is characterized in that: described step (A) comprises the following steps:
(A1) use valve handle (9) to close diffusion valve (6), isolated porous medium (5) and diffusion gas chamber (13);
(A2) temperature of setting in constant temperature oil bath (1) is appointment experimental temperature, and constant temperature makes the temperature stabilization of whole device for 4 hours;
(A3) valve-off (15), opens vacuum-pumping valve (14), utilizes vacuum pump, from vacuum-pumping valve (14), whole porous medium (5) is vacuumized to 24 hours;
(A4) close vacuum-pumping valve (14), open valve (15) and inject valve (17), utilize constant voltage injection pump (18) that the fluid in container (16) is injected in porous medium (5) by valve (15), constant voltage keeps 3 days under experimental pressure, and in these 3 days, keeping valve (15) always and injecting valve (17) is the state of opening;
(A5) valve-off (15), porous medium saturated fluid process finishes.
9. method according to claim 8, is characterized in that: described step (B) comprises the following steps:
(B1) open high pressure valve (10), gas cylinder (11) is filled with gas by high pressure valve (10) to diffusion gas chamber (13), when pressure arrives experimental pressure, closes high pressure valve (10);
(B2) utilize valve handle (9) to open diffusion valve (6), utilize pressure transducer (8) to record the pressure in gas diffusion chamber under different time (13), now the gas in gas diffusion chamber (13) spreads to porous medium (5) by diffusion valve (6) simultaneously;
(B3) record experimental data, the force value under different time, when experimental pressure remained unchanged in 1 hour, stops experiment;
(B4) experimental data is processed, tried to achieve gas axial diffusion coefficient in the porous medium of saturated fluid.
10. method according to claim 9, is characterized in that: described step (B4) specifically comprises the following steps:
(B41) take the difference of the pressure that records in the original pressure of testing and experimentation is the longitudinal axis, take the square root of experimental period and the subduplicate difference of initial time is transverse axis, experimental data is plotted in rectangular coordinate system, again the experimental data in rectangular coordinate system is carried out to linear fit 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, P is the pressure of experimental period while 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 is the time that experiment is carried out, t
0it is the time that diffusion starts, in these parameters, except D
aB, other parameters are all known.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| CN105300849A (en) * | 2015-11-27 | 2016-02-03 | 西南石油大学 | Device and method for testing gas diffusion coefficient in porous medium |
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