CN104632151B - Method for improving recovery ratio by ion matching water drive - Google Patents
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/20—Displacing by water
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Abstract
The invention provides a method for improving recovery efficiency by ion matching water flooding. The method comprises the following steps: detection of a target low-permeability sandstone oil reservoir, selection of ion matching water, core fluidity test and the like. The method takes a low-permeability sandstone oil reservoir as an object, aims at deepening an ion matching water drive-oil/water/rock micro-action mechanism, overcomes an ion matching water drive depressurization and injection enhancement technology, breaks through the bottleneck of a low-permeability oil reservoir oil recovery efficiency improvement technology, establishes the low-permeability sandstone oil reservoir oil recovery efficiency improvement technology taking ion matching water as a carrier, and forms an ion matching water drive oil displacement efficiency improvement technology with independent intellectual property rights.
Description
Technical field
The present invention relates to a kind of ion mates the method that water drive improves recovery ratio, belong to technical field of petroleum extraction.
Background technology
Oil-field flooding is to supplement stratum energy, sets up displacement pressure system one of simple effective method, is also most
The agent technology producing on number oil field, and, water drive will be the agent technology of global oil field development within considerable time.Low
Ooze, the importance of extra-low permeability oil reservoirs exploitation is consisted of reserves, the analysis of contribution to yield is apparent.With Exploitation degree
Constantly deepen, the economical and effective exploitation of low-permeability oilfield still suffer from production decline with realize recovery ratio, productivity index decline with
Extract is surely oily, set up effective pressure displacement system and control the multiple challenge such as aqueous.Different from middle and high infiltration oil reservoir, chemical flooding,
Mixed phase drives, air drives etc. improves the application in low-permeability oil deposit for the recovery efficiency technique and is originated etc. by reservoir condition, material the shadow of factor
Ring, still do not make substantial breakthroughs.
Study that flow media and reservoir under fine flowing environment interact and seepage flow mechanism problem is to solving LOW PERMEABILITY RESERVOIR
Development problem has directive significance.The key issue facing is the phase interaction disclosing in injected media-crude oil-stratum water-reservoir
With mechanism, and research and develop by playing the effect improving the water drive that becomes more meticulous using the interaction mechanism of reservoir-fluid.State's outside water
The emphasis direction driving the aspect that becomes more meticulous is low mineralization water drive, early in Tang G.Q. and Morrow (Tang and in 1996
Morrow1999a;Tang and Morrow1996;Tang and Morrow1997;Tang and Morrow1999b) earliest
Report the low mineralization effect in rock core displacement test, the oil displacement efficiency proposing dilution stratum water is higher than prime stratum water
Oil displacement efficiency.
Hereafter abroad carried out numerous studies for high salinity reservoir, seawater injection oil reservoir etc., be that low mineralization effect proposes
Multiple mechanism explain, over nearly 3 years, low mineralization water drive has become as the study hotspot of academia, the state such as annual SPE, SCA, EOR
The Quantity of Papers being related to low mineralization water drive in the paper of border meeting exponentially rises.International major oil companies and high institute
School has put into numerous studies strength in terms of low mineralization water drive, and has carried out existing in oil fields such as Syria, Alaska north slopes
Field test.The LoSal technology that BP proposes（Low mineralization water drive）(BP2011;Jerauld,et al.2008;Lager,et
al.2008;Shiran and Skauge2012), Shell propose DWF technology（Design water drive）It is all low mineralising Deng its essence
Degree water drive.
But, for the water drive effect of water extraction high recovery rate for low permeability sandstone reservoir, there is presently no properly
Evaluation methodology.
Content of the invention
For solving above-mentioned technical problem, it is an object of the invention to provide a kind of ion mates the side that water drive improves recovery ratio
Method, carries out displacement of reservoir oil operation change interface discrete force by mating water using ion, thus improving the recovery ratio of oil reservoir.
For reaching above-mentioned purpose, the invention provides a kind of ion mate water drive improve recovery ratio method, it include with
Lower step：
The detection of target low permeability sandstone reservoir：
The ionic type of the stratum water according to target low permeability sandstone reservoir and intensity, are calculated ground using formula (1)
The Debye constant of layer water：
In formula (1)：K is Boltzmann constant, and T is the absolute temperature of water, ε0For absolute dielectric constant, ε is medium
Relative dielectric constant, i represents the ion in water；ρ∞iFor ion concentration, unit is mol/L；ZiQuantivalence for ion i；ε is to be situated between
Matter relative dielectric constant, refers to the dielectric constant with respect to vacuum medium, also with regard to relative medium absolute dielectric constant；
Measure the Hamaker constant of the oil/water/rock of target low permeability sandstone reservoir, calculate ground using formula (2), (3)
Layer corresponding Van der Waals force Π of waterVan-der-Woals：
In formula (2), A is Hamaker constant；λ is London wavelength, and unit is nm；H (x) is oil/water and water/rock
The distance between stone interface（Alternatively referred to as water film thickness distribution）, unit is nm；
Measure the oil/water of target low permeability sandstone reservoir and the Zeta potential of water/rock interface, using formula (3), (4)
Calculate the corresponding double electrode layer repulsion Π of stratum waterelectrical：
ψx=ψ0e-κh(x)(4)
In formula (3), (4)：R1, r2 represent oil/water, the interface of water/rock respectively；ψr1、ψr2Be respectively oil/water,
Water/rock interface is in x direction（I.e. the distance between two interfaces direction）Zeta potential value, be calculated by formula (4)；
ψ0For the oil/water, water/rock interface Zeta potential value at x=0 position, directly test and draw；kBGrow rigorously constant for bohr；ψr1
For the Zeta potential at oil/water interface, unit is mV；ψr2For the Zeta potential of water/rock interface, unit is mV；κ is that debye is long
Degree, unit is m-1；AkFor proportionality constant；E is elementary charge, and unit is C；nbFor the ion number density in solution（This solution
Refer to the aqueous systems of different ions type and concentration, in the present invention, refer to prime stratum water and ion coupling water）；
Calculate water corresponding structural capacity Π in stratum in conjunction with Dybye constant and formula (5)structure：
Wherein, h (x) is distributed for water film thickness, and unit is nm；hsFor Debye length characteristic number；
Microcosmic effect between the rock/Shui Heshui/crude oil interface of target low permeability sandstone reservoir is calculated according to formula (6)
Power ΠTotal, i.e. the corresponding Π of stratum waterTotal, and obtain the corresponding Π of stratum waterTotalRelation with interface distance change is bent
Line：
ΠTotal=Πstructure+Πelectrical+ΠVan-der-Woals(6)；
If the corresponding Π of stratum waterTotalAll greater than 0, and the corresponding Π of stratum waterTotalWith interface distance change
Relation curve integrally assume the trend of monotone decreasing, then this target low permeability sandstone reservoir need not be entered using ion coupling water
Row water drive operation；If the corresponding Π of stratum waterTotalIt is not all higher than 0 or the corresponding Π of stratum waterTotalWith interface distance
A part for the relation curve of change assumes monotonically increasing trend, then adopt ion to mate this target low permeability sandstone reservoir
Water carries out water drive operation；
Ion mates the selection of water：
The salinity of the stratum water according to target low permeability sandstone reservoir selects ion coupling water, mates water according to this ion
Ionic type and intensity, using formula (1) be calculated ion mate water Debye constant；
Oil/water/rock between the crude oil of mensure ion coupling water and target low permeability sandstone reservoir, rock
Hamaker constant, calculates ion coupling corresponding Van der Waals force Π of water using formula (2)Van-der-Woals；
Oil/water between the crude oil of mensure ion coupling water and target low permeability sandstone reservoir, rock and water/rock interface
Zeta potential, calculates ion coupling water corresponding double electrode layer repulsion Π using formula (3), (4)electrical；
Calculate ion coupling water corresponding structural capacity Π in conjunction with Dybye constant and formula (5)structure；
Ion is calculated according to formula (6) and mates the rock/water between the crude oil of water and target low permeability sandstone reservoir, rock
Micro force Π and water/crude oil interface betweenTotal, i.e. the ion coupling corresponding Π of waterTotal, and obtain ion coupling water
Corresponding ΠTotalRelation curve with interface distance change；
If ion mates the corresponding Π of waterTotalIt is all higher than 0, and the ion coupling corresponding Π of waterTotalWith interface away from
Integrally assume the trend of monotone decreasing from the relation curve of change, then carry out rock core fluidity test；If ion mates water
Corresponding ΠTotalIt is not all higher than 0 or the ion coupling corresponding Π of waterTotalThe relation curve changing with interface distance
A part assumes monotonically increasing trend, then adjustment ion mates the composition of water, reduces salinity, improves containing of dianion
Amount, recalculates the ion coupling corresponding Π of waterTotal, and obtain the new ion coupling corresponding Π of waterTotalWith interface distance
The relation curve of change, until ion mates the corresponding Π of waterTotalIt is all higher than 0, and the ion coupling corresponding Π of waterTotalWith
The relation curve interface distance change integrally assumes the trend of monotone decreasing；
Rock core fluidity test：
Using rock core, rock core fluidity test is carried out to stratum water and ion coupling water, obtain recovery ratio and injection PV number
Relation curve；
If the ion coupling corresponding recovery ratio of water is all higher than the corresponding recovery ratio of stratum water it is determined that this ion mates water
It is applied to this target low permeability sandstone reservoir, and carry out water drive operation；
If the ion coupling corresponding recovery ratio of water is not all higher than the corresponding recovery ratio of stratum water it is determined that this ion
Water distribution is not suitable for this target low permeability sandstone reservoir, and adjustment ion mates the composition of water, reduces salinity, improve bivalence cloudy from
The content of son, re-starts the calculating ion coupling corresponding Π of waterTotal, obtain the new ion coupling corresponding Π of waterTotalWith
The relation curve of interface distance change and rock core fluidity test, until the ion coupling corresponding recovery ratio of water is all higher than stratum
The corresponding recovery ratio of water, carries out water drive operation afterwards.
In said method it is preferable that described λ=1.00E+02nm, kB=1.38E-23JK-1, T=2.98E+02K, hs=
5.00E-02nm, e=1.602E-19C, ε0=8.85×10-12Farad/rice.
In said method it is preferable that the relative dielectric constant of water is 78.36, the relative dielectric constant of oil is 7.3, rock
Relative dielectric constant be 8.0.
In said method it is preferable that the value of h (x) is 0.4-20mm, more preferably 0.5-20mm.
In said method, ion mates water and refers to containing appropriate ion and the concrete suitable water of salinity or claim water
Solution, the preferred dianion of above-mentioned ion, such as calcium ion and magnesium ion etc., the salinity that ion mates water is general otherwise low
In the critical water-sensitive salinity of target low permeability sandstone reservoir, it is preferable that ion mates the salinity of water, to be not less than target hypotonic
The critical water-sensitive salinity of sandstone oil reservoir thoroughly.
In said method, usually, in the stratum water in the oil reservoir that ion coupling water is suitable for, Ca should be contained2+And Mg2+,
The salinity of stratum water is not less than 10000mg/L, Ca2+And Mg2+Content sum be not less than 100mg/L.This two conditions are
Mate water adaptive oil reservoir primary election condition as ion, there is no very strict restriction.
In said method, when selecting ion coupling water, can be obtained by adding inorganic salt in water, adopted from
Son and inorganic salt can be common, for example：Calcium ion, magnesium ion etc., inorganic salt can be sulfate, hydrochlorate etc., in this regard,
Ca is contained in the ion coupling water that can be selected as needed and be adjusted it is preferable that be adopted2+And Mg2+.It is highly preferred that
Mate the stereometer of water with ion, the composition that this ion mates water includes：K++Na+Content be 1900mg/L, Ca2+Content
For 200mg/L, Mg2+Content be 30mg/L, HCO3 -Content be 30mg/L, Cl-Content be 3199mg/L, SO4 2-Content
For 210mg/L, salinity is 5569mg/L.
Ion provided by the present invention mates water drive and improves the method for recovery ratio
No need to carry out ion coupling water drive and evaluated, this evaluation, by carrying out to the detection of various parameters and calculating, obtains stratum
The corresponding Π of waterTotalAnd the corresponding Π of stratum waterTotalWith the relation curve of interface distance change, then according to ΠTotal's
The trend of value and above-mentioned relation curve is carried out；Determine this target low permeability sandstone reservoir be appropriate to ion coupling water drive it
Afterwards, select suitable ion coupling water, then repeat parameter detecting above and calculating process, obtain ion coupling water pair
The Π answeringTotalAnd the ion coupling corresponding Π of waterTotalWith the relation curve of interface distance change, then according to ΠTotal's
This ion of Trend judgement of value and above-mentioned relation curve mates water if appropriate for this target low permeability sandstone reservoir, if suitable
Close, then carry out rock core fluidity test, if it is not, then adjustment ion mates composition and the salinity of water（Typically to reduce
Salinity, the content of raising dianion）, repeat above-mentioned judgement, require until meeting；Tried by rock core mobility
Test the relation curve obtaining recovery ratio and injection PV number, ion coupling water judged again if appropriate for this oil reservoir according to this curve,
If be suitable for, carry out water drive operation, if it is not, then adjustment ion mates the composition of water and salinity, repeat before
Evaluation, until meet require.In above process, related detection is all conventional detection in oil field, may be referred to
Corresponding standard and Normal practice are carried out.The process of rock core fluidity test can also be carried out in a conventional manner.
In the present invention, if no specified otherwise or definition, all of parameter code name and its computational methods and oil
The definition in work field and its computational methods are consistent, and those skilled in the art can determine that it measures and/or computational methods.
Existing water driving technology is mainly supplementary stratum energy, sets up displacement pressure system, is replaced crude oil by water filling
Out.The exploitation of low-permeability oil deposit conventional waterflooding is primarily present that water injection pressure is high, super-broken split pressure or along invalid after crack water injection
The problems such as water breakthrough problem and low permeability reservoir mineral sensitivity, these problems lead to low permeability reservoir injury serious and can not
Inverse, effective difficult water injection.Narrow and small additionally, due to the effective pore throat of LOW PERMEABILITY RESERVOIR, specific surface area is big, leads to capillary force big, liquid liquid circle
Face, the impact of liquid/solid interface interaction are much larger than middle and high infiltration oil reservoir.In fine pore throat space, pass through between flow media and reservoir
There is complicated interaction in physical absorption/desorption, fine migration, clay swell etc., the impact to water drive is great.Therefore,
Need to set up the new concept of water injection in low-permeability oilfield, injection water is not merely to supplement the medium of energy it is often more important that playing note
Enter the interaction of water and reservoir.Mated by ion change the Van der Waals force of oil/water/rock interface, double electrode layer repulsion and
Structural capacity, so that absorption can be desorbed automatically in the crude oil of rock wall, reduces residual oil saturation, improves water-oil phase
Permeation area, improves the oil displacement efficiency of water drive.
The present invention is with low permeability sandstone reservoir as object, to deepen ion coupling water drive-oil/water/rock microcosmic effect
Mechanism is target, captures ion coupling water drive increasing injection technology, breaks through low Permeability reservoir for improving recovery factor technical bottleneck, set up
The low permeability sandstone reservoir as carrier for the water is mated with ion and improves recovery efficiency technique, form the ion with independent intellectual property right
Water distribution is driven and is improved oil displacement efficiency technology.
Pass through to test profit rock Hamaker constant, analysis stratum water ion composition meter by the method that the present invention provides
Calculation Deybe constant, test oil/water termination Zeta potential and water/rock interface Zeta potential, the calculating Zeta potential regularity of distribution,
The auxiliary judgment ion such as Van der Waals force, double electrode layer repulsion and structural capacity mate water usable condition, can be better achieved from
Son coupling water drive operation.
Brief description
Fig. 1 is interfacial interaction power with water film thickness variation relation curve.
Fig. 2 is different water type rock core displacement test recovery ratio and displacement PV number relation curve.
Specific embodiment
In order to be more clearly understood to the technical characteristic of the present invention, purpose and beneficial effect, the now skill to the present invention
Art scheme carry out described further below, but it is not intended that to the present invention can practical range restriction.
Embodiment
Present embodiments provide a kind of ion and mate the method that water drive improves recovery ratio, wherein, crude oil used is long celebrating west
The degassed crude of 137 wells, the viscosity under the conditions of 65 DEG C is 9.0mPa s, and rock core adopts the reservoir cores of Xi137Jing, temperature
For 65 DEG C.Rock core ensaying the results are shown in Table 1, test result indicate that, the reservoir cores clay mineral content of Xi137Jing is higher,
And based on chlorite and kaolinite.Used by experiment, oil component analysis result is shown in Table 2, mainly based on saturated hydrocarbons, but
It is to have a small amount of non-hydrocarbon and asphaltene.The composition analysis result of prime stratum water and ion coupling water is shown in Table 3, and ion coupling water is overall
Salinity is relatively low, but is the increase in a small amount of dianion.Table 4 is prime stratum water and ion coupling aqueous systems and oil reservoir
The Zeta potential test result at rock and in-place oil interface, from test result it can be seen that ion coupling water and reservoir rockses and
The Zeta potential of in-place oil is far above stratum water.The rock core displacement test of different aqueous systems the results are shown in Table 5, test result indicate that
Ion coupling waterflood recovery efficiency factor is far above prime stratum waterflood recovery efficiency factor, and this mates the technology of water drive system with the ion of this invention
Scheme is consistent.
Specific evaluation procedure is as follows：
（1）Ionic type according to stratum water and Strength co-mputation Debye constant；Wherein, the ion composition of stratum water is shown in Table
3, calculated using formula (1)；The Debye constant of the prime stratum water being calculated using formula (1) is 3.23nm-1.
（2）Measure the Hamaker constant of oil/water/rock, wherein, the Hamaker constant of crude oil/stratum water/rock is
8.14×10-21, water corresponding Van der Waals force in stratum is calculated using formula (2), result is as shown in table 6.
（3）Measure the Zeta potential of oil/water and water/rock interface, it is as shown in the table for result, using formula (3) and formula (4)
It is calculated the corresponding double electrode layer repulsion of stratum water, result is as shown in table 6.
（4）Calculating in conjunction with Dybye constant and formula (5) calculate the corresponding structural capacity of stratum water, and result is as shown in table 6.
（5）Micro force Π between rock/Shui Heshui/crude oil interface is calculated according to formula (6)Total（Stratum water pair
The Π answeringTotal）, and obtain ΠTotalRelation curve with interface distance change（See Fig. 1）, under the conditions of irreducible water and residual oil
Rock core displacement test result see Fig. 2 respectively（Following line represents using recovery ratio during the water drive displacement of stratum and injection PV number
Relation curve, when line above represents that ion mates water drive, recovery ratio is with the relation curve of injection PV number.Permissible from two curves
Find out that ion coupling displacement water ratio stratum water drive improves recovery ratio 15% about）.
In FIG, line below is the corresponding curve of stratum water, and it represents oil/water interface and water/rock under the water state of stratum
The interaction force at stone interface shows as gravitation, and interface interaction power is negative value；Following line mates the corresponding curve of water for ion,
Ion mate water change two interfaces active force so as to be repulsion, interface interaction power show as on the occasion of.Stratum water in Fig. 1
Corresponding curve shows：The corresponding Π of stratum waterTotalSome be less than 0, and this curve some present dullness
Incremental trend, therefore, it can carry out ion coupling water drive.
（6）Select ion coupling water, its composition is as shown in table 3；Mate ionic type and the Strength co-mputation of water according to ion
Debye constant；The Debye constant being calculated ion coupling aqueous systems using formula (1) is 1.04nm-1.
（7）Measure the Hamaker constant of oil/water/rock, its Crude Oil/ion mates the Hamaker constant of water/rock
For 6.32 × 10-21, the ion coupling corresponding Van der Waals force of water is calculated using formula (2), result is as shown in table 7.
（8）Measure oil/ion and mate water and the Zeta potential of ion coupling water/rock interface, it is as shown in the table for result, adopts
Formula (3) and formula (4) are calculated the ion coupling corresponding double electrode layer repulsion of water, and result is as shown in table 7.
（9）Calculating in conjunction with Dybye constant and formula (5) calculate the ion coupling corresponding structural capacity of water, result such as table 7 institute
Show.
（10）Rock/ion is calculated according to formula (6) and mates the microcosmic effect between water and ion coupling water/crude oil interface
Power ΠTotal（Ion mates the corresponding Π of waterTotal）And the ion coupling corresponding Π of waterTotalPass with interface distance change
It is curve：Oil/water/rock micro interface force profile that ion mates water is shown in the rock under the conditions of Fig. 1, irreducible water and residual oil
Heart displacement test result is shown in Fig. 2 respectively.
Be can be seen that by curve above in Fig. 1：Ion mates the corresponding Π of waterTotalIt is all higher than 0, and this curve assumes list
Adjust the trend successively decreased, illustrate that the composition of above-mentioned ion coupling water is suitable for this oil reservoir, rock core displacement test can be carried out；
（11）Before rock core displacement test, first by rock core（Rock core displacement is carried out using 1# rock core, 2# rock core simultaneously real
Test）10 hours, the porosity and permeability value of testing rock core is dried, test result is shown in Table 5 under the conditions of being placed on 105 DEG C.
（12）Rock core is evacuated respectively saturation prime stratum water, then adopt 0.1,0.2,0.3,0.4 and 0.5mL/min
Flow velocity test single-phase water surveys permeability, and test result is shown in Table 5.
（13）Using mineral oil（Viscosity is 9mPa s）Displacement rock core at ambient temperature, sets up initial water saturation,
The initial water saturation of final rock core is shown in Table 5.
（14）Oleic permeability under the conditions of initial water saturation, test result are tested using the flow velocity of 0.05mL/min
It is shown in Table 5.
（15）Rock core is placed on after aging 30 days at 65 DEG C, starts flood pot test, displacement velocity is 0.05mL/min, note
Record displacement time and accumulation oil-producing data, finally calculate the relation curve of recovery ratio and injection PV.
Ion mate water make the micro force of oil/water and water/rock interface be constant be on the occasion of and with moisture film
The increase of thickness is gradually lowered, but it is negative value that stratum water makes the micro force of oil/water and water/rock interface, shows as
Captivation, is unfavorable for the desorption of crude oil.
Rock core clay combining result tested by table 1
The component of table 2 Changqing oilfields crude oil
| Mass ratio | Saturated hydrocarbons | Aromatic hydrocarbon | Non-hydrocarbons | Colophonium |
| wt% | 65.05 | 23.3 | 6.68 | 4.97 |
Table 3 stratum water and the component of ion coupling water
The Zeta potential of oil/water/rock interface that the test of table 4 laboratory obtains
| Water type | Oil/water interface Zeta potential (mV) | Water/rock interface Zeta potential (mV) |
| Prime stratum water | -7.7 | -8.7 |
| Ion mates water | -21.73 | -18.7 |
Table 5 rock core displacement test physical parameter and displacement efficiency compare
The corresponding Van der Waals force of table 6 prime stratum water, structural capacity and double electrode layer repulsion
The table 7 ion coupling corresponding Van der Waals force of water, structural capacity and double electrode layer repulsion
Rock core displacement test result shows：Ion coupling water improves recovery ratio 13.27- on the basis of conventional water drive
15.60%, this explanation can obtain good oil displacement efficiency using ion coupling water drive.
Claims (10)
1. a kind of ion mates the method that water drive improves recovery ratio, and it comprises the following steps：
The detection of target low permeability sandstone reservoir：
The ionic type of the stratum water according to target low permeability sandstone reservoir and intensity, are calculated stratum water using formula (1)
Debye constant：
In formula (1)：K is Boltzmann constant, and T is the absolute temperature of water, ε0For absolute dielectric constant, ε is that medium is situated between relatively
Electric constant, i represents the ion in water；ρ∞iFor ion concentration, unit is mol/L；ZiQuantivalence for ion i；
Measure the Hamaker constant of the oil/water/rock of target low permeability sandstone reservoir, stratum water is calculated using formula (2) and corresponds to
Van der Waals force ΠVan-der-Woals：
In formula (2), A is Hamaker constant；λ is London wavelength, and unit is nm；H (x) is oil/water and water/rock circle
The distance between face, unit is nm；
Measure the oil/water of target low permeability sandstone reservoir and the Zeta potential of water/rock interface, calculated using formula (3), (4)
Stratum water corresponding double electrode layer repulsion Πelectrical：
ψx=ψ0e-κh(x)(4)
In formula (3), (4)：R1, r2 represent oil/water, the interface of water/rock respectively；ψr1、ψr2It is respectively oil/water, water/rock
Interface is in the Zeta potential value in x direction；ψ0For the oil/water, water/rock interface Zeta potential value at x=0 position, directly survey
Examination draws；kBGrow rigorously constant for bohr；ψr1For the Zeta potential at oil/water interface, unit is mV；ψr2For water/rock interface
Zeta potential, unit is mV；κ is Debye constant, and unit is m-1；AkFor proportionality constant；E is elementary charge, and unit is C；nbFor
Ion number density in solution；
Calculate water corresponding structural capacity Π in stratum in conjunction with Dybye constant and formula (5)structure：
Wherein, h (x) is distributed for water film thickness, and unit is nm；hsFor Debye Constant eigenvalue number；
Micro force between the rock/Shui Heshui/crude oil interface of target low permeability sandstone reservoir is calculated according to formula (6)
ΠTotal, i.e. the corresponding Π of stratum waterTotal, and obtain the corresponding Π of stratum waterTotalRelation curve with interface distance change：
ΠTotal=Πstructure+Πelectrical+ΠVan-der-Woals(6)；
If the corresponding Π of stratum waterTotalAll greater than 0, and the corresponding Π of stratum waterTotalPass with interface distance change
It is the trend that curve integrally assumes monotone decreasing, then this target low permeability sandstone reservoir need not carry out water using ion coupling water
Drive operation；If the corresponding Π of stratum waterTotalIt is not all higher than 0 or the corresponding Π of stratum waterTotalWith interface distance change
The part of relation curve assume monotonically increasing trend, then this target low permeability sandstone reservoir is entered using ion coupling water
Row water drive operation；
Ion mates the selection of water：
The salinity of the stratum water according to target low permeability sandstone reservoir selects ion coupling water, according to this ion mate water from
Subtype and intensity, are calculated, using formula (1), the Debye constant that ion mates water；
The Hamaker of the oil/water/rock between the crude oil of mensure ion coupling water and target low permeability sandstone reservoir, rock is normal
Number, calculates ion coupling corresponding Van der Waals force Π of water using formula (2)Van-der-Woals；
Oil/water between the crude oil of mensure ion coupling water and target low permeability sandstone reservoir, rock and water/rock interface Zeta
Current potential, calculates ion coupling water corresponding double electrode layer repulsion Π using formula (3), (4)electrical；
Calculate ion coupling water corresponding structural capacity Π in conjunction with Dybye constant and formula (5)structure；
According to formula (6) calculate ion mate rock/water between the crude oil of water and target low permeability sandstone reservoir, rock and
Micro force Π between water/crude oil interfaceTotal, i.e. the ion coupling corresponding Π of waterTotal, and obtain ion coupling water pair
The Π answeringTotalRelation curve with interface distance change；
If ion mates the corresponding Π of waterTotalIt is all higher than 0, and the ion coupling corresponding Π of waterTotalBecome with interface distance
The relation curve changed integrally assumes the trend of monotone decreasing, then carry out rock core fluidity test；If ion coupling water corresponds to
ΠTotalIt is not all higher than 0 or the ion coupling corresponding Π of waterTotalWith the relation curve of interface distance change one
Divide and assume monotonically increasing trend, then adjustment ion mates the composition of water, reduces salinity, improves the content of dianion,
Recalculate the ion coupling corresponding Π of waterTotal, and obtain the new ion coupling corresponding Π of waterTotalBecome with interface distance
The relation curve changed, until ion mates the corresponding Π of waterTotalIt is all higher than 0, and the ion coupling corresponding Π of waterTotalWith
The relation curve of interface distance change integrally assumes the trend of monotone decreasing；
Rock core fluidity test：
Using rock core, rock core fluidity test is carried out to stratum water and ion coupling water, obtain the relation of recovery ratio and injection PV number
Curve；
If the ion coupling corresponding recovery ratio of water is all higher than the corresponding recovery ratio of stratum water it is determined that this ion coupling water is suitable for
In this target low permeability sandstone reservoir, and carry out water drive operation；
If the ion coupling corresponding recovery ratio of water is not all higher than the corresponding recovery ratio of stratum water it is determined that this ion mates water
It is not suitable for this target low permeability sandstone reservoir, adjustment ion mates the composition of water, reduces salinity, improves dianion
Content, re-starts the calculating ion coupling corresponding Π of waterTotal, obtain the new ion coupling corresponding Π of waterTotalWith interface
The relation curve of distance change and rock core fluidity test, until the ion coupling corresponding recovery ratio of water is all higher than stratum water pair
The recovery ratio answered, carries out water drive operation afterwards.
2. method according to claim 1, wherein, described λ=1.00E+02nm, kB=1.38E-23JK-1, T=2.98E
+ 02K, hs=5.00E-02nm, e=1.602E-19C, ε0=8.85 × 10-12Farad/rice.
3. method according to claim 1, wherein, the relative dielectric constant of water is 78.36, and the relative dielectric constant of oil is
7.3, the relative dielectric constant of rock is 8.0.
4. method according to claim 1, wherein, the value of described h (x) is 0.4-20mm.
5. method according to claim 4, wherein, the value of described h (x) is 0.5-20mm.
6. method according to claim 1, wherein, the salinity that described ion mates water is not less than target low infiltration sandrock
The critical water-sensitive salinity of oil reservoir.
7. method according to claim 1, wherein, contains Ca in the water of described stratum2+And Mg2+.
8. the method according to claim 1 or 7, wherein, the salinity of described stratum water is not less than 10000mg/L, Ca2+With
Mg2+Content sum be not less than 100mg/L.
9. method according to claim 1, wherein, described ion coupling water contains Ca2+And Mg2+.
10. the method according to claim 1 or 9, wherein, mates the stereometer of water with ion, and described ion mates water
Composition includes：K++Na+Content be 1900mg/L, Ca2+Content be 200mg/L, Mg2+Content be 30mg/L, HCO3 -Contain
Measure as 30mg/L, Cl-Content be 3199mg/L, SO4 2-Content be 210mg/L, salinity be 5569mg/L.
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