CN107762461B - A kind of polymer flooding oil-extraction technical risk evaluation method - Google Patents
A kind of polymer flooding oil-extraction technical risk evaluation method Download PDFInfo
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Abstract
The invention discloses a kind of polymer flooding oil-extraction technical risk evaluation methods, are related to polymer flooding oil-extraction technical field.The Risk Evaluation method includes the numerical value for obtaining the risk indicator of oil reservoir, and the applicable limitation of risk indicator, risk indicator include: reservoir temperature, oil reservoir water salinity, permeability, viscosity of crude, divalent cation concentration, coefficient of permeability variation, reservoir buried depth and relative oil density；The numerical value of risk indicator is judged whether in applicable limitation, and when the numerical value of all risk indicators is in applicable limitation, the risk score of risk indicator corresponding with the numerical value of risk indicator is obtained according to the first preset rules；According to the risk score of risk indicator, the risk assessment score of oil reservoir is obtained according to the second preset rules；The polymer flooding oil-extraction technical risk grade of oil reservoir is judged according to risk assessment score.Risk Evaluation method provided by the invention obtains more scientific, comprehensive wind direction and assesses score by the influence of the multiple risk indicators of consideration.
Description
Technical field
The present invention relates to polymer flooding oil-extraction technical fields, in particular to a kind of polymer flooding oil-extraction technical risk judge side
Method.
Background technique
It, generally can be by oil when encountering formation pressure deficiency leads to recovery ratio low situation in oil reservoir recovery process
Injection of polymer oil displacement agent enhances oil reservoir driving force in layer, improves recovery ratio.This exploitation skill using polymer oil-displacing agent
Art is known as polymer flooding oil-extraction technology, is the technology of the promotion recovery ratio generally used in oil field development field.But to not
With geological conditions oil reservoir implement polymer flooding oil-extraction technology when, the oil deposit parameters such as reservoir temperature, reservoir buried depth, viscosity of crude are equal
It will affect polymer flooding oil-extraction ultimate recovery, therefore the recovery ratio for improving oil reservoir by polymer flooding oil-extraction technology has one
Fixed risk.It usually needs to carry out risk assessment to oil reservoir before implementing polymer flooding and adopting operation, to judge that the oil reservoir whether can
It is enough that recovery ratio is improved by polymer flooding oil-extraction technology.
In the prior art, a kind of Risk Evaluation method of polymer displacement of reservoir oil tech is provided.Specifically provide following eight
Risk indicator: reservoir temperature, oil reservoir water salinity, permeability, viscosity of crude, divalent cation concentration, coefficient of permeability variation,
Reservoir buried depth, relative oil density, while additionally providing the applicable limitation of above-mentioned eight risk indicators, that is, give above-mentioned risk
Index meets the maximum value and minimum value when carrying out polymer flooding oil-extraction technical conditions.The evaluation method includes: to obtain wait judge
The numerical value of above-mentioned eight risk indicators of oil reservoir.Judge the numerical value of any one risk indicator whether in its applicable limitation, if
There are the numerical value of at least one risk indicator not in corresponding applicable limitation, then explanation is improved by polymer flooding oil-extraction
There are greater risk, which is not suitable for using polymer flooding oil-extraction technology the recovery ratio of the oil reservoir；If the oil reservoir is any one
Item index parameter is in the corresponding scope of application, then explanation improves the recovery ratio wind of the oil reservoir by polymer flooding oil-extraction
Danger is smaller, which is suitable for using polymer flooding oil-extraction technology.
In the implementation of the present invention, the inventor finds that the existing technology has at least the following problems:
Risk Evaluation method provided by the prior art can not reflect multiple index parameters for polymer displacement of reservoir oil tech
Combined influence, and then be difficult for oil reservoir exploitation provide have higher guiding value, scientific comprehensive risk assessment.
Summary of the invention
Multiple index parameters can not be reflected for polymer displacement of reservoir oil skill in order to solve Risk Evaluation method in the prior art
The problem of combined influence of art, the embodiment of the invention provides a kind of polymer displacement of reservoir oil tech Risk Evaluation method, the technical sides
Case is specific as follows:
A kind of polymer flooding oil-extraction technical risk evaluation method, comprising:
It obtains the numerical value of the risk indicator of oil reservoir and the applicable limitation of the risk indicator, the risk indicator includes:
Reservoir temperature, oil reservoir water salinity, permeability, viscosity of crude, divalent cation concentration, coefficient of permeability variation, reservoir buried depth
And relative oil density；
Judge the numerical value of the risk indicator whether in the applicable limitation,
When the numerical value of all risk indicators is in the applicable limitation, according to the acquisition of the first preset rules and institute
State the risk score of the corresponding risk indicator of numerical value of risk indicator；
According to the risk score of the risk indicator, the risk assessment point of the oil reservoir is obtained according to the second preset rules
Number；
The polymer flooding oil-extraction technical risk grade of the oil reservoir is judged according to the risk assessment score.
Optionally, the risk indicator corresponding with the numerical value of the risk indicator is being obtained according to the first preset rules
Before risk score, the evaluation method further include: using any one described risk indicator as variable, fix other risks
The numerical value of index,
First when acquisition is equal to maximum value in its described applicable limitation as the numerical value of the risk indicator of variable adopts
Yield raising value,
Second when acquisition is equal to minimum value in its described applicable limitation as the numerical value of the risk indicator of variable adopts
Yield raising value,
When the absolute difference of the first recovery ratio raising value and the second recovery ratio raising value is more than or equal to the
When one preset value, the wind of the risk indicator corresponding with the numerical value of the risk indicator is obtained according to first preset rules
Dangerous score.
Optionally, first preset rules include: that the applicable limitation is divided into n sub- boundaries, by the risk
The risk score of index is divided into n score section, and n is the integer more than or equal to 1, wherein the corresponding m wind of the sub- boundary of m
Dangerous score section, m are the integer more than or equal to 1 and less than or equal to n, the risk indicator in the sub- boundary of m
Numerical value and the risk score in the m risk score section it is in a linear relationship.
Optionally, second preset rules include: to bring the risk score into formula (1), obtain the oil reservoir
Risk assessment score F,
F=C1×α1+C2×α2…+Ci×αi (1)
Wherein, 1≤i≤8, and i is integer, α1+α2…+αi=1,
I is the quantity of the risk indicator,
CiFor the risk score,
αiFor the risk score CiWeight coefficient,
F is the risk assessment score of the oil reservoir.
Optionally, second preset rules include: to bring the risk score into formula (2), obtain the oil reservoir
Risk assessment score F,
F=(C1×C2…×Ci)1/i (2)
Wherein, 1≤i≤8, and i is integer,
I is the quantity of the risk indicator,
CiFor the risk score,
F is the risk assessment score of the oil reservoir.
Optionally, second preset rules include: to bring the risk score into formula (3), obtain the oil reservoir
Risk assessment score F,
F=Cj1×α1+Cj2×α2…+Cji×αi+(Ck1×Ck2…×Ckd)1/d×αh (3)
Wherein, 0≤i≤8,0≤d≤8, and i, d are integer, α1+α2…+αi+αh=1,
CkdIt is less than described second for the absolute difference of the first recovery ratio raising value and the second recovery ratio raising value
The risk score of preset value and the risk indicator more than or equal to first preset value,
D is less than described second in advance for the absolute difference of the first recovery ratio raising value and the second recovery ratio raising value
If the quantity of value and the risk indicator more than or equal to first preset value,
αhFor risk assessment parameter Ck1×Ck2…×CkdWeight coefficient,
CjiAbsolute difference for the first recovery ratio raising value and the second recovery ratio raising value is more than or equal to
The risk score of the risk indicator of second preset value,
I is more than or equal to institute for the absolute difference of the first recovery ratio raising value and the second recovery ratio raising value
The quantity of the risk indicator of the second preset value is stated,
αiFor risk assessment parameter CjiWeight coefficient,
F is the risk assessment score of the oil reservoir.
Optionally, first preset value is 5%, and second preset value is 10%.
Optionally, the polymer flooding oil-extraction technical risk etc. that the oil reservoir is judged according to the risk assessment score
Grade, comprising: obtain when the numerical value of all risk indicators is equal to it most useful for the numerical value for increasing the recovery ratio raising value
When, the first risk assessment score F ' of the oil reservoir, the risk after the normalized of the oil reservoir is obtained by formula (4) is commented
Estimate score FG,
FG=F/F ' (4)
Wherein, F is the risk assessment score.
Optionally, the first risk assessment score and the risk assessment score are obtained using identical rule.
Technical solution provided in an embodiment of the present invention has the benefit that
In embodiments of the present invention, the numerical value of risk indicator and the risk point of risk indicator are established by the first preset rules
Corresponding relationship between number, and then quantify the influence degree that risk indicator drives oil producing operation risk to reservoir polymer；By more
The risk score of a risk indicator obtains the risk assessment score of oil reservoir according to the second preset rules, so acquired risk
Assessment score has reacted the combined influence that multiple risk indicators carry out polymer displacement of reservoir oil tech to oil reservoir.Through the embodiment of the present invention
The Risk Evaluation method of offer can obtain more scientific, comprehensive wind direction assessment score, can rapidly, scientifically predict oil
Hiding provides guidance if appropriate for progress polymer flooding oil-extraction operation for the comprehensive exploitation in oil field, not only saves the time, more can
The investment of human and material resources, financial resources is effectively reduced.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, embodiment of the present invention will be made into one below
Step ground detailed description.
Embodiment one
The embodiment of the invention provides a kind of polymer flooding oil-extraction technical risk evaluation method, which includes:
The applicable limitation of step 101, the numerical value of the risk indicator of acquisition oil reservoir and risk indicator.
Wherein, risk indicator includes: that reservoir temperature, oil reservoir water salinity, permeability, viscosity of crude, bivalent cation are dense
Degree, coefficient of permeability variation, reservoir buried depth and relative oil density.It should be noted that divalent cation concentration refers to
The concentration of bivalent cation in oil reservoir water.
Whether step 102 judges the numerical value of risk indicator in applicable limitation.
When there are the numerical value of any one risk indicator not in applicable limitation, then illustrates that the oil reservoir is not applicable and gathered
It closes object and drives oil recovery technique.
Step 103, when the numerical value of all risk indicators is in applicable limitation, according to the first preset rules obtain and wind
The risk score of the corresponding risk indicator of the numerical value of dangerous index.
The corresponding relationship between the numerical value of risk indicator and the risk score of risk indicator is established by the first preset rules,
And then quantify the influence degree that risk indicator drives oil recovery technique risk to reservoir polymer.
Step 104, the risk score according to risk indicator obtain the risk assessment point of oil reservoir according to the second preset rules
Number.
The risk assessment score of oil reservoir is obtained according to the second preset rules by the risk score of multiple risk indicators, is protected
The acquired risk assessment score of card has reacted the combined influence that multiple risk indicators carry out polymer displacement of reservoir oil tech to oil reservoir.
Step 105, the polymer flooding oil-extraction technical risk grade that oil reservoir is judged according to risk assessment score.
Risk Evaluation method provided in an embodiment of the present invention, the multiple risk indicators of comprehensive consideration adopt reservoir polymer drive
The influence of oil tech, acquired risk assessment value are more scientific, comprehensive.It can rapidly, scientifically by the Risk Evaluation method
Oil reservoir prediction and then provides guidance if appropriate for the application for carrying out polymer flooding oil-extraction technology for the comprehensive exploitation in oil field, not only
The time is saved, the investment of human and material resources, financial resources can more be effectively reduced.
Embodiment two
The present embodiment will be apparent from Risk Evaluation method, and specifically, which includes:
The applicable limitation of step 201, the numerical value of the risk indicator of acquisition oil reservoir and risk indicator, risk indicator include:
Reservoir temperature, oil reservoir water salinity, permeability, viscosity of crude, divalent cation concentration, coefficient of permeability variation, reservoir buried depth
And relative oil density.Wherein, the applicable limitation of eight risk indicators is as shown in table 1.
The applicable limitation of 1 risk indicator of table
Step 202 judges the numerical value of risk indicator whether in applicable limitation, and the numerical value of risky index does not exist if it exists
When in applicable limitation, illustrates that the oil reservoir is not applicable and carry out polymer flooding oil-extraction technology.
Step 203, when the numerical value of all risk indicators is in applicable limitation, above-mentioned eight wind direction indexs are sieved
Choosing, removal influence little risk indicator to oil recovery raising value in applicable limitation, simplify operation.
Wherein, the value due to above-mentioned eight risk indicators in applicable limitation and oil recovery raising value are linear
Relationship.It therefore is the recovery ratio raising value and wind in applicable limitation when maximum value by competing risks index when being screened
Recovery ratio raising value when dangerous index is minimum value in applicable limitation, that is, can determine whether the risk parameter to oil recovery raising value
Influence degree.Specific screening technique is as follows:
Using any one risk indicator as variable, the numerical value of other risk indicators is fixed, obtains and refers to as the risk of variable
Target numerical value is equal to the first recovery ratio raising value when maximum value in its applicable limitation；Obtain the number of the risk indicator as variable
Value is equal to the second recovery ratio raising value when the minimum value of its applicable limitation.
When the absolute difference of the first recovery ratio raising value and the second recovery ratio raising value is less than the first preset value, illustrate
In applicable limitation, influence of the numerical value of the risk indicator to oil recovery raising value is little, therefore can be screened out.
When the absolute difference of the first recovery ratio raising value and the second recovery ratio raising value is more than or equal to the first preset value
When, the risk score of risk indicator corresponding with the numerical value of risk indicator is obtained according to the first preset rules.
Wherein, for obtaining the concrete mode of the first recovery ratio raising value and the second recovery ratio raising value without limitation, example
Such as obtained by physical contradictions or Eclipse numerical simulation software.
When risk indicator is preset parameter, numerical value is in applicable limitation most beneficial for raising oil recovery raising value
Numerical value.Specifically, reservoir temperature is 25 DEG C, and oil reservoir water salinity is 0.1g/L, permeability 3000mD, and viscosity of crude is
1mPas, divalent cation concentration 0g/L, coefficient of permeability variation 0.5, reservoir buried depth 500m, relative oil density are
0.72。
And the first preset value is usually chosen to 5%.I.e. in the applicable limitation of risk indicator, oil recovery raising value is not
When more than 5%, it is believed that influence of the risk indicator to oil recovery raising value is little, can screen out the risk parameter.Certainly
First preset value can also be set according to the actual situation, it is to be understood that the first preset value is smaller, institute of the embodiment of the present invention
The Risk Evaluation method of offer considers more risk indicators, and the reservoir risk assessment carried out is more comprehensive.
Step 204, the risk score that risk indicator corresponding with the numerical value of risk indicator is obtained by the first preset rules.
Wherein, the first preset rules refer to the corresponding relationship between the value of risk indicator and risk score, pass through the first default rule
The specific quantization influenced on risk indicator is then realized, the specific implementation embodiment of the present invention of the first preset rules is mentioned
For following optinal plan.
Specifically, in a linear relationship in the risk score of the first preset rules risk index and the numerical value of risk indicator.
For example, risk score increase with the increase of risk indicator numerical value or risk score with risk indicator numerical value increase
And reduce.
Further, the influence due to risk indicator to oil recovery may not be at the uniform velocity to change, can basis
The applicable limitation of risk indicator is divided into n sub- boundaries by knowhow, and n is the integer more than or equal to 1.Similarly, often
Cross-talk boundary corresponds to one section of risk score, specifically, the corresponding m risk score section of the sub- boundary of m, wherein m be greater than or
Integer equal to 1 and less than or equal to n.And in the numerical value and m risk score section of the risk indicator in the sub- boundary of m
Risk score is in a linear relationship.
In other words, risk score is in a piecewise function relationship about the numerical value of risk indicator.Wherein with risk indicator
Numerical value is independent variable, and in applicable limitation, is n section by the numerical division of risk indicator, any section has corresponded to difference
Linear function relationship.
The value of the sub- boundary n wherein marked off for applicable limitation is not specifically limited, such as n is 2,3,4,5,6
Deng can be set according to the actual situation.But it should be recognized that the value of n is bigger, risk indicator can be more refined for oil
Hide the influence degree of risk.
For example, specifically by taking reservoir temperature, formation water salinity, permeability and viscosity of crude as an example, such as 2 institute of table
Show.
Wherein, the applicable limitation of reservoir temperature is divided into 2 sub- boundaries, i.e., 25 DEG C~50 DEG C and 50 DEG C~80
℃.This 2 sub- boundaries have respectively corresponded 1 risk score section, specifically, 25 DEG C~50 DEG C corresponding risk scores 100~75
Point；50 DEG C~80 DEG C corresponding 75~0 points of risk score.It is same right herein it should be noted that for Unify legislation in table 2
50 DEG C~80 DEG C of section is divided.It will be appreciated by those skilled in the art that in 50 DEG C~60 DEG C, 60 DEG C~70
DEG C and 70 DEG C~80 DEG C sections in, the linear function relationship between the numerical value and risk score of reservoir temperature is identical.
What it is by formation water salinity, permeability and viscosity of crude is 4 sub- boundaries, every sub- boundary using boundary line delimitation
Different risk score sections is corresponded to.
The corresponding relationship of table 2 first preset rules risk score and risk indicator numerical value
Further, specifically by taking reservoir temperature as an example, illustrate risk corresponding with risk indicator numerical value in a certain sub- boundary
The calculation method of score.
For example, when reservoir temperature is 30 DEG C, in 25 DEG C~50 DEG C of sub- boundary, the corresponding risk point of the sub- boundary
Several sections are 100~75.Wherein, temperature is every rises 1 DEG C, and risk score reduces by 1 point, therefore 30 DEG C of the corresponding risk of reservoir temperature
Score is 95 points.
For another example when reservoir temperature is 56.6 DEG C, in 50 DEG C~60 DEG C of sub- boundary, the corresponding wind of the sub- boundary
Dangerous score section is 75~50, and wherein temperature is every rises 0.1 DEG C, and risk score reduces by 0.25 point, therefore 56.6 DEG C of whens corresponding wind
Dangerous score is 73.35 points.
The corresponding risk score of other risk indicators is all made of similar calculation method and obtains, i.e., first determines risk indicator institute
Sub- boundary and the corresponding risk score section of the sub- boundary；Determine risk score with the increased variation of risk indicator again
Rate, and then the end value of zygote boundary and risk score corresponding with end value obtain the risk score of risk indicator.
Step 205 is greater than first in the absolute difference for obtaining the first recovery ratio raising value and the second recovery ratio raising value
After the risk score of the risk indicator of preset value, oil is obtained according to the second preset rules according to the risk score of these risk indicators
The risk assessment score of hiding.Wherein without limitation for the specific implementation of the second preset rules, the embodiment of the present invention provides
Three kinds of optional methods below.
First method, the second preset rules include: to bring risk score into formula (1), obtain the risk assessment of oil reservoir
Score F,
F=C1×α1+C2×α2…+Ci×αi (1)
Wherein, i≤8, α1+α2…+αi=1, and i is integer,
I is the quantity of risk indicator,
CiFor risk score,
αiFor risk score CiWeight coefficient,
F is the risk assessment score of oil reservoir.
Wherein different risk indicators has different weight coefficients, can be determined according to knowhow.For example, at this
In method, the weight coefficient of reservoir temperature is 0.4, and the weight coefficient of oil reservoir water salinity is 0.3, and the weight coefficient of permeability is
0.15, the weight coefficient of viscosity of crude is 0.15.
Second method, the second preset rules include: to bring risk score into formula (2), obtain the risk assessment of oil reservoir
Score F,
F=(C1×C2…×Ci)1/i (2)
Wherein, i≤8, and i is integer,
I is the quantity of risk indicator,
CiFor risk score,
F is the risk assessment score of oil reservoir.
The third method, the second preset rules include: to bring risk score into formula (3), obtain the risk assessment of oil reservoir
Score F,
F=Cj1×α1+Cj2×α2…+Cji×α+(Ck1×Ck2…×Ckd)1/d×αh (3)
Wherein, 0≤i≤8,0≤d≤8, and i, d are integer, α1+α2…+αi+αh=1,
CkdIt is less than described second for the absolute difference of the first recovery ratio raising value and the second recovery ratio raising value
The risk score of preset value and the risk indicator more than or equal to first preset value,
D is less than described second in advance for the absolute difference of the first recovery ratio raising value and the second recovery ratio raising value
If the quantity of value and the risk indicator more than or equal to first preset value,
αhFor risk assessment parameter Ck1×Ck2…×CkdWeight coefficient,
CjiAbsolute difference for the first recovery ratio raising value and the second recovery ratio raising value is more than or equal to
The risk score of the risk indicator of second preset value,
I is more than or equal to institute for the absolute difference of the first recovery ratio raising value and the second recovery ratio raising value
The quantity of the risk indicator of the second preset value is stated,
αiFor risk assessment parameter CjiWeight coefficient,
F is the risk assessment score of the oil reservoir.
Wherein, the first preset value is 5%, and the second preset value is 10%.Different risk indicators is equally right in the method
Answer different weight coefficients.
Step 206, obtain oil reservoir risk assessment score after, the polymer flooding of oil reservoir is judged according to risk assessment score
Oil recovery technique risk class.The processing of risk assessment score normalization and risk class assessment are specifically included, wherein passing through normalizing
Change processing can be convenient for judging the risk class of risk assessment score according to evaluation criteria.
Specifically, normalized includes: and obtains to harvest when the numerical value of all risk indicators is equal to it most useful for increase
When the numerical value of rate raising value, the first risk assessment score F ' of oil reservoir, by formula (4) obtain oil reservoir normalized after
Risk assessment score FG,
FG=F/F ' (4)
Wherein, F is risk assessment score.
Step 207 carries out risk class assessment by the risk assessment score after acquired normalized.It is specific next
It says, when risk indicator is most useful for recovery ratio raising value is increased, passes through the risk assessment point for the oil reservoir that the above method obtains
Number is the first risk score, and the risk which carries out polymer flooding oil-extraction technology is minimum；When risk indicator is to be most disadvantageous in
When increasing recovery ratio raising value, the risk assessment score of the oil reservoir obtained by the above method is the second risk score, the oil reservoir
Carry out the risk highest of polymer flooding oil-extraction technology.Similarly, it can also be drawn between the first risk score and the second risk score
Multiple score sections are separated, for more accurately judging the risk class of the risk assessment score after normalized.
Risk assessment score and the first risk score in the risk class for judging the oil reservoir, after comparing normalized
And second risk score gap.When normalization treated risk assessment score is closer to the first risk score, explanation
The risk that the oil reservoir carries out polymer flooding oil-extraction technology is lower；When normalization treated risk assessment score is closer to the second wind
When dangerous score, illustrate that the risk of oil reservoir progress polymer flooding oil-extraction technology is higher.Wherein, the first risk assessment score F ' and wind
Danger assessment score F is obtained using identical rule.
Embodiment three
Present embodiments provide the concrete application of above-mentioned Risk Evaluation method.
The judge of polymer flooding oil-extraction technical risk is carried out to certain oil reservoir, the reservoir temperature of the oil reservoir is 77 DEG C, oil reservoir water mine
Change degree is 1.78mg/L, permeability 100-500mD, viscosity of crude 30Pas, divalent cation concentration 1.45g/L, is seeped
The saturating rate coefficient of variation is 0.72, reservoir buried depth 1800m, relative oil density 0.82.
According to table 1, the numerical value of above-mentioned risk indicator screens out above-mentioned risk indicator in the range of its applicable limitation
In the absolute difference of the first recovery ratio raising value and the second recovery ratio raising value be less than or equal to 5% risk indicator parameter.
Specifically, the molecular weight 16,000,000 of the reservoir polymer displacement of reservoir oil, concentration 1000mg/L, injection rate 90mL, note
Enter speed 0.6ml/min.Subsequent waterflooding makes well water be 98%, rock core having a size of long 30cm, width 4.5cm, high 4.5cm,
It is rock core pressure is 5MPa that reservoir buried depth, which is 500m conversion, and it be rock core pressure is 21MPa that reservoir buried depth, which is 2100m conversion,.According to
Above-mentioned parameter determines the first recovery ratio raising value and the second harvesting of each risk indicator with physical contradictions method
The absolute difference of rate raising value, the results are shown in Table 3.
The absolute difference of table 3 risk indicator the first recovery ratio raising value and the second recovery ratio raising value
By the result of table 3 it is found that wherein the difference of the first recovery ratio raising value and the second recovery ratio raising value be greater than or
Risk indicator equal to 5% are as follows: reservoir temperature, oil reservoir water salinity, permeability and viscosity of crude.Wherein, work as risk indicator
When for preset parameter, numerical value is in applicable limitation most beneficial for the numerical value for improving oil recovery raising value.Specifically, oily
Hiding temperature is 25 DEG C, and oil reservoir water salinity is 0.1g/L, permeability 3000mD, viscosity of crude 1mPas, bivalent cation
Concentration is 0g/L, coefficient of permeability variation 0.5, reservoir buried depth 500m, relative oil density 0.72.
Further, first preset rules according to shown in table 2 obtain and reservoir temperature, oil reservoir water salinity, permeability
And the corresponding risk score of viscosity of crude.
Specifically, obtained by table 2: the risk score of reservoir temperature is 7.5 points, and the risk score of oil reservoir water salinity is
60 points, the risk score of permeability is 25-56 points, and the risk score of viscosity of crude is 30 points.
Further, by the risk score of reservoir temperature, oil reservoir water salinity, permeability and viscosity of crude according to
Two preset rules obtain the risk assessment score of oil reservoir, and risk assessment score is normalized.
The risk assessment score of oil reservoir is obtained using formula (1), wherein the weight coefficient of reservoir temperature is 0.4, oil reservoir water
The weight coefficient of salinity is 0.3, and the weight coefficient of viscosity of crude is 0.15, and the weight coefficient of permeability is 0.15.
Specifically, when the risk score of permeability is 25 timesharing, the risk assessment score of oil reservoir are as follows:
F=7.5 × 0.4+60 × 0.3+25 × 0.15+30 × 0.15=29.25,
The risk assessment score is normalized, specifically:
FG=F/F '=29.25/ (100 × 0.4+100 × 0.3+100 × 0.15+100 × 0.15)=0.2925.
When the risk score of permeability is 56 timesharing, the risk assessment score of oil reservoir are as follows:
F=7.5 × 0.4+60 × 0.3+56 × 0.15+30 × 0.15=33.90,
The risk assessment score is normalized, specifically:
FG=F/F '=33.9/ (100 × 0.4+100 × 0.3+100 × 0.15+100 × 0.15)=0.3390.
Risk class assessment is carried out to the risk assessment score FG after normalized.Specifically, the risk of oil reservoir is commented
Estimate the following fourth gear of grade classification:
When the risk score of all risk indicators is all 100 timesharing, risk assessment grade F100 is obtained；
When the risk score of all risk indicators is all 75 timesharing, risk assessment grade F75 is obtained；
When the risk score of all risk indicators is all 50, risk assessment grade F50 is obtained；
When the risk score of all risk indicators is all 25, risk assessment grade F25 is obtained；
When the risk score of all risk indicators is all 0, risk assessment grade F0 is obtained.
Wherein, the risk score FG after normalized illustrates that oil reservoir carries out polymer flooding and adopts between F100~F75
The risk of oil tech is low；
Risk score FG after normalized illustrates that oil reservoir carries out polymer flooding oil-extraction technology between F75~F50
Have certain risk；
Risk score FG after normalized illustrates that oil reservoir carries out polymer flooding oil-extraction technology between F50~F25
Risk it is high；
Risk score FG after normalized illustrates that oil reservoir carries out polymer flooding oil-extraction technology between F25~F0
Risk superelevation.
The risk score after normalized of oil reservoir is 0.2925~0.3390, between F50~F25, is said
It is bright that polymer flooding oil-extraction technical risk height is carried out to the oil reservoir.
Similarly, formula (2) and formula (3) can be used also to obtain the risk assessment score of oil reservoir.Wherein pass through formula
(2) it is 24.10-29.49 that risk assessment score, which is calculated, and risk score is 0.2410-0.2949 after normalized.With it is upper
Evaluation grade comparison is stated, carrying out polymer displacement of reservoir oil tech to the oil reservoir has high risk or superelevation risk.
When being calculated by formula (3), the difference of the first recovery ratio raising value and the second recovery ratio raising value is more than or equal to
5%, the risk indicator less than 10% is water salinity and viscosity of crude.Further, the weight coefficient of reservoir temperature is 0.4,
For the weight coefficient of permeability equal to 0.35, the weight coefficient of the product of oil reservoir water salinity and viscosity of crude is 0.25.
It is computed, obtaining risk assessment score is 22.36-33.21, and risk score is 0.2236- after normalized
0.3321.It is compared with above-mentioned evaluation grade, carrying out polymer displacement of reservoir oil tech to the oil reservoir has high risk or superelevation risk.
It should be noted that step number is only used for facilitating the description judge in the embodiment of the present invention one and embodiment two
Method is not used in the sequence limited between step, can carry out sequence of steps as the case may be in the actual operation process
Adjustment.
The foregoing is merely a prefered embodiment of the invention, is not intended to limit the invention, all in the spirit and principles in the present invention
Within, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention.
Claims (5)
1. a kind of polymer flooding oil-extraction technical risk evaluation method, which is characterized in that the described method includes:
The numerical value of the risk indicator of oil reservoir and the applicable limitation of the risk indicator are obtained, the risk indicator includes: oil reservoir
Temperature, oil reservoir water salinity, permeability, viscosity of crude, divalent cation concentration, coefficient of permeability variation, reservoir buried depth and
Relative oil density；
The numerical value of the risk indicator is judged whether in the applicable limitation, when the numerical value of all risk indicators is in institute
When stating in applicable limitation, the wind of the risk indicator corresponding with the numerical value of the risk indicator is obtained according to the first preset rules
Dangerous score；First preset rules are the corresponding relationship between the value and risk score of risk indicator；
According to the risk score of the risk indicator, the risk assessment score of the oil reservoir is obtained according to the second preset rules；Institute
Stating the second preset rules includes:
It brings the risk score into formula (1), obtains the risk assessment score F of the oil reservoir,
F=C1×α1+C2×α2…+Ci×αi (1)
Wherein, 1≤i≤8, and i is integer, α1+α2…+αi=1,
I is the quantity of the risk indicator,
CiFor the risk score,
αiFor the risk score CiWeight coefficient,
F is the risk assessment score of the oil reservoir；
Alternatively, second preset rules include:
It brings the risk score into formula (2), obtains the risk assessment score F of the oil reservoir,
F=(C1×C2…×Ci)1/i (2)
Wherein, 1≤i≤8, and i is integer,
I is the quantity of the risk indicator,
CiFor the risk score,
F is the risk assessment score of the oil reservoir；
Alternatively, second preset rules include:
It brings the risk score into formula (3), obtains the risk assessment score F of the oil reservoir,
F=Cj1×α1+Cj2×α2…+Cji×αi+(Ck1×Ck2…×Ckd)1/d×αh (3)
Wherein, 0≤i≤8,0≤d≤8, and i, d are integer, α1+α2…+αi+αh=1,
CkdFor the absolute difference of the first recovery ratio raising value and the second recovery ratio raising value less than the second preset value and be greater than or
Equal to the risk score of the risk indicator of the first preset value,
D is less than second preset value for the absolute difference of the first recovery ratio raising value and the second recovery ratio raising value
And it is more than or equal to the quantity of the risk indicator of first preset value,
αhFor risk assessment parameter Ck1×Ck2…×CkdWeight coefficient,
CjiIt is more than or equal to for the absolute difference of the first recovery ratio raising value and the second recovery ratio raising value described
The risk score of the risk indicator of second preset value,
I is that the absolute difference of the first recovery ratio raising value and the second recovery ratio raising value is more than or equal to described the
The quantity of the risk indicator of two preset values,
αiFor risk assessment parameter CjiWeight coefficient,
F is the risk assessment score of the oil reservoir
The polymer flooding oil-extraction technical risk grade of the oil reservoir is judged according to the risk assessment score, comprising:
It obtains when the numerical value of all risk indicators is equal to it most useful for the numerical value for increasing recovery ratio raising value, the oil
First risk assessment score F ' of hiding, the risk assessment score FG after the normalized of the oil reservoir is obtained by formula (4),
FG=F/F ' (4)
Wherein, F is the risk assessment score.
2. Risk Evaluation method according to claim 1, which is characterized in that according to the first preset rules obtain with it is described
Before the risk score of the corresponding risk indicator of the numerical value of risk indicator, the evaluation method further include:
Using any one described risk indicator as variable, the numerical value of other risk indicators is fixed,
The numerical value of the risk indicator as variable is obtained equal to the first recovery ratio in its described applicable limitation when maximum value
Raising value,
The numerical value of the risk indicator as variable is obtained equal to the second recovery ratio in its described applicable limitation when minimum value
Raising value,
When the absolute difference of the first recovery ratio raising value and the second recovery ratio raising value is more than or equal to first in advance
If when value, the risk point of the risk indicator corresponding with the numerical value of the risk indicator is obtained according to first preset rules
Number.
3. Risk Evaluation method according to claim 1, which is characterized in that first preset rules include:
The applicable limitation is divided into n sub- boundaries, the risk score of the risk indicator is divided into n score section, n is
Integer more than or equal to 1, wherein
The corresponding m risk score section of the sub- boundary of m, m are the integer more than or equal to 1 and less than or equal to n,
The numerical value of the risk indicator in the sub- boundary of m is in the risk score in the m risk score section
Linear relationship.
4. Risk Evaluation method according to claim 1, which is characterized in that first preset value is 5%, described second
Preset value is 10%.
5. Risk Evaluation method according to claim 1, which is characterized in that the first risk assessment score and the wind
Danger assessment score is obtained using identical rule.
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