CN109883889A - Simulate CO2In dense matrix-crack diffusion experimental provision and leading edge prediction technique - Google Patents
Simulate CO2In dense matrix-crack diffusion experimental provision and leading edge prediction technique Download PDFInfo
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Abstract
The invention discloses simulation CO2In dense matrix-crack diffusion experimental provision and leading edge prediction technique, the present invention is on the basis of existing technology, by improving experimental provision, band simulation fracture is compacted by fracturing propping agents, simultaneously (if it is vertical injection by the way of being injected laterally into, the pressure of injection process may impact matrix section, leading to matrix section, nearby crude oil is got into matrix deep, influence diffusion experiment precision), it can reduce wall effect of hiding caused by compression shock influences when due to gas injection, so that the measuring of diffusion coefficient is more accurate.Improved device is easy to operate, can more simulate true environment, meanwhile, utilize experimental model inversion prediction CO2Concentration field and diffusion leading edge, avoid diffusion process direct sample and obtain CO2It is interfered caused by system balancing when concentration, improves experimental precision.
Description
Technical field
The present invention relates to Oil-Gas Field Development Engineering technical fields, are specifically related to simulation CO2 and spread in dense matrix-crack
Experimental provision and leading edge prediction technique.
Background technique
CO2Diffusion dissolution can reduce viscosity of crude, interfacial tension in crude oil, extracts the light components in crude oil and makes original
Oil volume expansion improves oil recovery to improve crude oil fluidity.In CO2During-EOR, molecule diffusion has extremely
Important role, CO2Diffusion coefficient in crude oil determines its rate of dissolution and final meltage in crude oil, in turn
It affects and improves recovery ratio effect.
The exploitation of compact oil reservoir is most important for alleviating China's oil resource supply and demand tense situation, however due to fine and close oil
The features such as low porosity and low permeability and reservoir shortage of natural are hidden, crude output is very low.Simultaneously as fracture development, there are strong
The reasons such as stress sensitivity and higher starting pressure gradient, conventional water driving technology for compact oil reservoir volume increase for effect very
It is micro-.Practice have shown that working as CO2By injection compact oil reservoir, CO2Molecule diffuses into dense matrix by crack, can will be in dense matrix
Crude oil drain into crack, to effectively improve oil recovery factor.Therefore, CO under reservoir condition is studied2In saturated oils dense matrix-
Diffusion coefficient and CO in Fracture System2Dispersal behavior becomes one to the affecting laws for improving recovery ratio effect and important grinds
Study carefully direction.
In traditional CO2During diffusion coefficient measuring, the influence of latent wall effect when due to gas injection, so that incubation period
Stage CO2Diffusion coefficient is far longer than the subsequent stage, increases diffusion coefficient measuring error.So-called latent wall effect is
Refer to gas diffusion leading edge since diffusion to arriving at rock core bottom during this, in the incipient stage of diffusion, when due to gas injection
Fluctuation caused by oil gas two-phase can generate Convention diffusion effect, and at the beginning of diffusion, CO2With the original being saturated at core surface
Need to establish a stable gas-liquid interface boundary condition when oily just contact, there are a CO2It is dissolved into core surface oil sample
Process.Currently, seldom for preclinical research, " Measurement of Gas Diffusivity in Heavy
Oils " incubation period is corrected using NUMERICAL MATCH METHOD FOR in a text, CO has been obtained by numerical fitting2In viscous crude
Diffusion coefficient.On the other hand, for CO2Concentration field and the up-front research of diffusion in diffusion process, at present mainly by along journey
Chromatography directly obtains CO after sampling2Concentration value, but sampling can interfere system balancing, influence experimental precision；And
It is very few for spreading up-front research at present.
Summary of the invention
In view of the above-mentioned problems, the present invention provides simulation CO2In dense matrix-crack diffusion experimental provision and leading edge prediction
Method, its object is to study injection fluid imbibition, diffusion phenomena into dense matrix from crack.
The present invention uses following technical solutions:
Simulate CO2In dense matrix-crack diffusion experimental provision, including high pressure gas cylinder, injection pump, intermediate receptacle, rock
Heart clamp holder, insulating box, backpressure pump, the lower end of the intermediate receptacle connect injection pump, and upper end connects high pressure gas cylinder, the rock core
Bottom in clamper is equipped with compact rock core, and the upper end of compact rock core is equipped with fracturing propping agents compaction band, the fracturing propping agents
Left through-hole, right through-hole are respectively equipped on the core holding unit barrel end face of the left and right endface of compaction band, the left through-hole is in
Between the upper end of container be connected, right through-hole is connected with backpressure pump, and the other end of backpressure pump is equipped with Oil-gas Separation and meter；The rock
The upper end of heart clamp holder is equipped with pressure sensor, and right end is pumped equipped with confining pressure.
Preferably, the injection pump is constant speed and constant pressure pump, and the fracturing propping agents compaction band is in hypertonic rock core or haydite
One kind.
Preferably, the pressure sensor is connected by data collecting card with computer.
Preferably, the pipeline that the high pressure gas cylinder is connect with intermediate receptacle is equipped with the first valve；Intermediate receptacle and a left side are logical
The pipeline of hole connection is equipped with third valve；The pipeline that right through-hole is connect with backpressure pump is equipped with the 5th valve；Pressure sensor
The pipeline connecting with core holding unit is equipped with the 4th valve.
Preferably, the intermediate receptacle and core holding unit are arranged in insulating box.
Preferably, the Oil-gas Separation and meter include: gas-liquid separator and gasometer, gas-liquid separator and gas
Fluid meter is connected by pipeline, and the gas-liquid separator is with graduated graduated cylinder, the sealing of top rubber stopper.
Utilize simulation CO2In the leading edge prediction technique of dense matrix-crack diffusion experimental provision, include the following steps:
A, the pipeline in experimental provision is washed and dried, connects the air-tightness of experimental provision and check device,
It is in close state all valves；The temperature of regulating thermostatic case is to 75 DEG C；
B, crude oil is saturated after vacuumizing compact rock core and measures the crude oil volume of saturation, is then placed on rock core folder
The pressure break of bottom in holder, permeability needed for being converted according to proppant scale in the practical fracturing technology design of compact oil reservoir supports
Agent compaction band is placed at the top of compact rock core, and diameter is identical as compact rock core；
C, by CO2It imports in intermediate receptacle, so that the pressure of intermediate receptacle is reached 16.44MPa and keep stable, backpressure pump
(15) pressure is identical as intermediate receptacle pressure setting, and the confining pressure of core holding unit 2MPa high compared with intermediate receptacle pressure prevents from revealing；
D, third valve is opened, CO is injected to core holding unit by injection pump constant speed2, reach the pressure of core holding unit
To after 16.44MPa, third valve is closed, starts diffusion experiment, records the pressure change of core holding unit, work as core holding unit
Pressure gradually reduce and keep stablize after diffusion experiment terminate, cleaning plant；
E, according to the pressure versus time data of the core holding unit of pressure sensor record, experimental pressure drop curve is drawn；
F, diffusion mathematics modular form is established according to diffusion experiment physical model, is kept in conjunction with actual gas state equation and quality
Constant rule, system pressure and diffusion process are contacted, and diffusion coefficient is calculated；
G, dimensionless solution is sought after mathematics modular form zero dimension being spread by zero dimension format, is programmed using Matlab
CO is calculated2It is diffused into the dimensionless concentration value at different spaces point and time point；Pass through zero dimension format, diffusion model inverting
Acquire CO2Actual dispersion predicts CO away from discrete time2The spatial concentration field of diffusion and diffusion leading edge.
Preferably, the center of described fracturing propping agents compaction band or so end face is aligned with Zuo Tongkong, right through-hole respectively.
Preferably, the CO2Diffusion leading edge is the position corresponding when being initial concentration 5% of the concentration after diffusion.
The beneficial effects of the present invention are:
The present invention provides simulation CO2In dense matrix-crack diffusion experimental provision and leading edge prediction technique, the device knot
Structure is simple, easy to operate, is compacted band simulation fracture by fracturing propping agents, while using the mode that is injected laterally into (vertical injection: note
The pressure for entering process may impact matrix section, and leading to matrix section, nearby crude oil is got into matrix deep, and it is real to influence diffusion
Test precision), it can reduce wall effect of hiding caused by compression shock influences when due to gas injection, so that the experiment of diffusion coefficient is surveyed
It is fixed more accurate.Meanwhile CO is predicted using model inversion2Concentration field and diffusion leading edge, avoid diffusion process direct sample and obtain
Take CO2It is interfered caused by system balancing when concentration.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, the attached drawing to embodiment is simply situated between below
It continues, it should be apparent that, the accompanying drawings in the following description merely relates to some embodiments of the present invention, rather than limitation of the present invention.
Fig. 1 is the structural schematic diagram of apparatus of the present invention；
Fig. 2 is core holding unit pressure versus time data experiment falloff curve schematic diagram of the present invention；
Fig. 3 is that core holding unit pressure versus time data falloff curve of the present invention is fitted schematic diagram；
Fig. 4 is different time CO of the present invention2Spread leading edge (dimensionless concentration be equal to 0.05 corresponding to position) signal
Figure；
CO when Fig. 5 is the present invention 30 days2Spatial concentration field schematic diagram；
CO when Fig. 6 is the present invention 60 days2Spatial concentration field schematic diagram；
CO when Fig. 7 is the present invention 90 days2Spatial concentration field schematic diagram；
CO when Fig. 8 is the present invention 120 days2Spatial concentration field schematic diagram；
Fig. 9 is that dense matrix of the present invention-crack CO2 spreads physical model structure schematic diagram.
It is as shown in the figure:
Wherein, 1- high pressure gas cylinder, 2- injection pump, 3- intermediate receptacle, the first valve of 4-, 6- third valve, the 4th valve of 7-,
The 5th valve of 8-, 9- pressure sensor, 10- fracturing propping agents compaction band, 11- compact rock core, 12- core holding unit, 13- constant temperature
Case, 14- confining pressure pump, 15- backpressure pump, 16- Oil-gas Separation and meter, 17-Zuo Tongkong, 18-right through-holes.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
Attached drawing, the technical solution of the embodiment of the present invention is clearly and completely described.Obviously, described embodiment is this hair
Bright a part of the embodiment, instead of all the embodiments.Based on described the embodiment of the present invention, ordinary skill
Personnel's every other embodiment obtained under the premise of being not necessarily to creative work, shall fall within the protection scope of the present invention.
Unless otherwise defined, the technical term or scientific term that the disclosure uses should be tool in disclosure fields
The ordinary meaning for thering is the personage of general technical ability to be understood.The similar word meaning such as " comprising " or "comprising" used in the disclosure
Point out that element or object before the existing word are covered the element for appearing in the word presented hereinafter or object and its be equal, without
Exclude other elements or object."upper", "lower", "left", "right" etc. are only used for indicating relative positional relationship, when being described object
Absolute position change after, then the relative positional relationship may also correspondingly change.
Present invention will be further explained below with reference to the attached drawings and examples.
As shown in Figure 1, simulation CO2In the experimental provision of dense matrix-crack diffusion, including high pressure gas cylinder 1, injection pump 2,
The lower end of intermediate receptacle 3, core holding unit 12, insulating box 13, backpressure pump 15, the intermediate receptacle 3 is injected by piping connection
Pump 2, injection pump 2 are constant speed and constant pressure pump, and upper end passes through piping connection high pressure gas cylinder 1, and the bottom in the core holding unit 12 is set
There is compact rock core 11, the upper end of compact rock core 11 is equipped with fracturing propping agents compaction band 10 (haydite), the left and right end face of the haydite
Left through-hole 17, right through-hole 18 are respectively equipped on the 12 barrel end face of core holding unit at place, the left through-hole 17 is by pipeline in
Between the upper end of container 3 be connected, right through-hole 18 is connected by pipeline with backpressure pump 15, the other end of backpressure pump 15 pass through pipeline and
Oil-gas Separation is connected with meter 16, and the Oil-gas Separation and meter 16 include: gas-liquid separator and gasometer, gas-liquid
Separator is connected with gasometer by pipeline, and the gas-liquid separator is with graduated graduated cylinder, the sealing of top rubber stopper.
The upper end of the core holding unit 12 is equipped with pressure sensor 9, and the pressure sensor 9 passes through data collecting card and computer phase
Even, the right end of core holding unit 12 is equipped with confining pressure pump 14.
The pipeline that the high pressure gas cylinder 1 is connect with intermediate receptacle 3 is equipped with the first valve 4；Intermediate receptacle 3 and left through-hole 17
The pipeline of connection is equipped with third valve 6；The pipeline that right through-hole 18 is connect with backpressure pump 15 is equipped with the 5th valve 8；Pressure passes
The pipeline that sensor 9 is connect with core holding unit 12 is equipped with the 4th valve 7, and the intermediate receptacle 3 and core holding unit 12 are all provided with
It sets in insulating box 13.
Utilize simulation CO2In the leading edge prediction technique of dense matrix-crack diffusion experimental provision, include the following steps:
A, the pipeline in experimental provision is washed and dried, connects the air-tightness of experimental provision and check device,
It is in close state all valves；The temperature of regulating thermostatic case 13 is to 75 DEG C；
B, crude oil is saturated after vacuumizing compact rock core 11 and measures the crude oil volume of saturation, is then placed on rock core
Bottom in clamper 12, the pressure break of permeability needed for being converted according to proppant scale in the practical fracturing technology design of compact oil reservoir
Proppant compaction band 10 (haydite) is placed in 11 top of compact rock core, and diameter is identical as compact rock core 11；Haydite or so end face
Center is aligned with left through-hole 17, right through-hole 18 respectively.
C, by CO2It imports in intermediate receptacle 3, so that the pressure of intermediate receptacle 3 is reached 16.44MPa and keep stable, backpressure pump
15 pressure are identical as 3 pressure setting of intermediate receptacle, pressure high 2MPa of the pressure compared with core holding unit 12 of confining pressure pump 14, anti-stopping leak
Dew；
D, third valve 6 is opened, CO is injected to core holding unit 12 by 2 constant speed of injection pump2, make core holding unit 12
After pressure reaches 16.44MPa, valve 6 is closed, starts diffusion experiment, records the pressure change of core holding unit 12, when rock core presss from both sides
The pressure of holder 12 gradually reduces and diffusion experiment after stablizing is kept to terminate, cleaning plant；
E, by the pressure versus time data for the computer record core holding unit 12 being connected with pressure sensor 9 (such as 1 institute of table
Show), it draws experimental pressure drop curve (as shown in Figure 2).
1 core holding unit experimental pressure of table-time tables of data
F, mathematics modular form is spread according to the foundation (as shown in Figure 9) of diffusion experiment physical model, if the condition of model foundation
It is as follows:
A, compact rock core is homogeneous texture；
B, gas diffusivity is kept constant during entire diffusion experiment；
C, only consider the molecule diffusion in pore media, ignore Convention diffusion caused by free convection；
D, do not consider that oil sample under experiment condition evaporates into the influence of gas phase；
E, ignore the liquid phase volume expansion effects generated in experiment by gas dissolution, that is, ignore as caused by volume expansion
Convention diffusion；
F, do not consider that the resistance to mass tranfer of gas-liquid interface, the concentration at gas-liquid interface are kept constant during the experiment.
It is as follows to establish diffusion mathematics modular form:
In formula (1), c CO2Concentration, unit: mol/m3,；c0For compact rock core surface C O under experimental temperature, pressure2Just
Beginning diffusion concentration, unit: mol/m3；T is time, unit: s；X is CO2Diffusion length, unit: m；D is CO2In dense matrix
Diffusion coefficient, unit: m2/s；L is compact rock core height, and unit: m, L are preferably L=0.05m.
To formula (1) derivation:
In conjunction with actual gas state equation and mass conservation law, system pressure and diffusion process are connected, it is related
It is formula:
In formula (3), VgIndicate gas phase CO2Volume；ZgIndicate actual gas compressibility factor；R indicates mol gas constant；T
Indicate experimental temperature；A indicates gas-liquid interface cross-sectional area；P (t) indicates gaseous pressure corresponding to different time.
Calculus is carried out to formula (2) to solve to obtain:
In formula (4), PeqIndicate the pressure at diffusion balance moment；Formula (4) is modified, infinite series are expressed as
Form:
For prolonged diffusion process, more advanced series can ignore whole result influence, therefore
Take first two of infinite series to get to theoretical calculation falloff curve formula,
By theoretical calculation falloff curve (formula 6) to the experimental pressure drop curve matching drawn in step E, while to latent
Phase is modified, and revised falloff curve fitting in conjunction with the data in table 1 as shown in figure 3, be calculated: Peq=
14.61641 m1=0.96259, k1=70.58592, m2=0.96259, k2=70.58588, R2=0.98777, it calculates
To diffusion coefficient:
G, CO is defined2Spread leading edge are as follows: current CO2Concentration is diffusion length corresponding to the 5% of initial position concentration.It is logical
Cross zero dimension format:Mathematical modeling formula (1) zero dimension will be spread:
In formula (8), C indicates dimensionless concentration；Z indicates zero dimension distance；T indicates non dimensional time.Solve zero dimension
Model (8) obtains dimensionless solution:
According to formula (9), CO is obtained using Matlab program calculation2It is diffused into the dimensionless of different spaces point and time point
Concentration value；Pass through zero dimension formatAcquire CO2Actual dispersion away from discrete time, and
Predict CO2The spatial concentration field (as shown in Figure 5-Figure 8) of diffusion and diffusion leading edge (as shown in Figure 4).Definition diffusion leading edge are as follows: when
Preceding concentration is position, i.e. dimensionless concentration C/C corresponding to the 5% of initial concentration0Position corresponding to=0.05.In Fig. 4
As corresponding to intersection point of the concentration curve with x-axis at a distance from, it can be seen from the figure that as time increases, CO2Constantly to cause
Close rock core bottom diffusion.By 120 days (non dimensional time T=0.688) time, spread leading edge advanced 0.037m (it is no because
Secondary distance Z=0.74).
The above described is only a preferred embodiment of the present invention, be not intended to limit the present invention in any form, though
So the present invention has been disclosed as a preferred embodiment, and however, it is not intended to limit the invention, any technology people for being familiar with this profession
Member, without departing from the scope of the present invention, when the technology contents using the disclosure above make a little change or modification
For the equivalent embodiment of equivalent variations, but anything that does not depart from the technical scheme of the invention content, according to the technical essence of the invention
Any simple modification, equivalent change and modification to the above embodiments, all of which are still within the scope of the technical scheme of the invention.
Claims (9)
1. simulating CO2In dense matrix-crack diffusion experimental provision, which is characterized in that including high pressure gas cylinder (1), injection pump
(2), the lower end of intermediate receptacle (3), core holding unit (12), insulating box (13), backpressure pump (15), the intermediate receptacle (3) connects
It connects injection pump (2), upper end connects high pressure gas cylinder (1), and the bottom in the core holding unit (12) is equipped with compact rock core (11), causes
The upper end of close rock core (11) is equipped with fracturing propping agents compaction band (10), the left and right endface of the fracturing propping agents compaction band (10)
Core holding unit (12) barrel end face on be respectively equipped with left through-hole (17), right through-hole (18), the left through-hole (17) and intermediate
The upper end of container (3) is connected, and right through-hole (18) is connected with backpressure pump (15), the other end of backpressure pump (15) equipped with Oil-gas Separation and
Meter (16)；The upper end of the core holding unit (12) is equipped with pressure sensor (9), and right end is equipped with confining pressure pump (14).
2. simulation CO according to claim 12In dense matrix-crack diffusion experimental provision, which is characterized in that described
Injection pump (2) is constant speed and constant pressure pump, and the fracturing propping agents compaction band (10) is one of hypertonic rock core or haydite.
3. simulation CO according to claim 12In dense matrix-crack diffusion experimental provision, which is characterized in that described
Pressure sensor (9) is connected by data collecting card with computer.
4. simulation CO according to claim 12In dense matrix-crack diffusion experimental provision, which is characterized in that described
The pipeline that high pressure gas cylinder (1) is connect with intermediate receptacle (3) is equipped with the first valve (4)；Intermediate receptacle (3) and Zuo Tongkong (17) are even
The pipeline connect is equipped with third valve (6)；The pipeline that right through-hole (18) connect with backpressure pump (15) is equipped with the 5th valve (8)；
The pipeline that pressure sensor (9) is connect with core holding unit (12) is equipped with the 4th valve (7).
5. simulation CO according to claim 12In dense matrix-crack diffusion experimental provision, which is characterized in that described
Intermediate receptacle (3) and core holding unit (12) are arranged in insulating box (13).
6. simulation CO according to claim 12In dense matrix-crack diffusion experimental provision, which is characterized in that described
Oil-gas Separation and meter (16) include: gas-liquid separator and gasometer, and gas-liquid separator and gasometer pass through pipe
Road is connected, and the gas-liquid separator is with graduated graduated cylinder, the sealing of top rubber stopper.
7. utilizing simulation CO2In the leading edge prediction technique of dense matrix-crack diffusion experimental provision, which is characterized in that including such as
Lower step:
A, the pipeline in experimental provision is washed and dried, connects the air-tightness of experimental provision and check device, makes institute
There is valve to be in close state；The temperature of regulating thermostatic case (13) is to 75 DEG C；
B, crude oil is saturated after vacuumizing compact rock core (11) and measures the crude oil volume of saturation, is then placed on rock core folder
Holder (12) interior bottom, the pressure break of permeability needed for being converted according to proppant scale in the practical fracturing technology design of compact oil reservoir
Proppant compaction band (10) is placed at the top of compact rock core (11), and diameter is identical as compact rock core (11)；
C, by CO2It imports in intermediate receptacle (3), so that the pressure of intermediate receptacle (3) is reached 16.44MPa and keep stable, backpressure pump
(15) pressure is identical as intermediate receptacle (3) pressure setting, the confining pressure of core holding unit (12) 2MPa high compared with intermediate receptacle pressure, prevents
Stopping leak dew；
D, third valve (6) are opened, CO is injected to core holding unit (12) by injection pump (2) constant speed2, make core holding unit
(12) it after pressure reaches 16.44MPa, closes third valve (6), starts diffusion experiment, record the pressure of core holding unit (12)
Power variation, diffusion experiment terminates after the pressure of core holding unit (12) gradually reduces and keeps stablizing, cleaning plant；
E, according to the pressure versus time data of the core holding unit (12) of pressure sensor (9) record, experimental pressure drop curve is drawn；
F, diffusion mathematics modular form is established according to diffusion experiment physical model, it is fixed in conjunction with actual gas state equation and the conservation of mass
Rule, system pressure and diffusion process are contacted, diffusion coefficient is calculated；
G, dimensionless solution is sought after mathematical modeling formula zero dimension being spread by zero dimension format, utilizes Matlab program calculation
Obtain CO2It is diffused into the dimensionless concentration value at different spaces point and time point；It is acquired by zero dimension format, diffusion model inverting
CO2Actual dispersion predicts CO away from discrete time2The spatial concentration field of diffusion and diffusion leading edge.
8. simulation CO according to claim 72In dense matrix-crack diffusion leading edge prediction technique, which is characterized in that
The center of fracturing propping agents compaction band (10) the left and right end face is aligned with Zuo Tongkong (17), right through-hole (18) respectively.
9. simulation CO according to claim 72In dense matrix-crack diffusion leading edge prediction technique, which is characterized in that
The CO2Diffusion leading edge is the position corresponding when being initial concentration 5% of the concentration after diffusion.
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