CN106894800A - A kind of profile control well selection decision-making technique suitable for Offshore Heavy Oil Field oil reservoir - Google Patents
A kind of profile control well selection decision-making technique suitable for Offshore Heavy Oil Field oil reservoir Download PDFInfo
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Abstract
The present invention relates to a kind of profile control well selection decision-making technique suitable for Offshore Heavy Oil Field oil reservoir, comprise the following steps：1) the single factor test index in profile control well selection decision-making is divided according to Criterion Attribute；2) numerical value of water injection well comprehensive evaluation index to be evaluated is calculated；3) average value of the block water injection well comprehensive evaluation index is calculated；4) by step 2) in the average value of the block water injection well comprehensive evaluation index that obtains in numerical value and the step 3 of water injection well comprehensive evaluation index to be evaluated that obtain be compared and then whether decision-making water injection well to be evaluated needs to carry out profile control measures.The present invention has advantages below：1st, the influence of viscosity of crude has been taken into full account in heavy crude reservoir profile control well selection decision-making at sea of the invention so that profile control well selection decision-making technique is more accurate.2nd, analytic hierarchy process (AHP) is employed in the present invention and calculates every weights, eliminate human factor influence so that profile control well selection decision-making technique more science, rationally.
Description
Technical field
The present invention relates to a kind of profile control well selection decision-making technique suitable for Offshore Heavy Oil Field oil reservoir, belong to oil-gas field development neck
Domain.
Background technology
Profile control and water plugging technology is the steady oil control water of heterogeneous reservoir, the key technology of waterflood efficiency is improved, in improving ecology oil
Field development effectiveness, raising oil field ultimate recovery aspect play an important role.In entering successively with offshore oilfield exploitation
Later stage, many oil well productions will be into high water cut stage, and the status of profile control and water plugging technology will be more and more important.Profile control measures into
Be defeated by and be heavily dependent on scientific and reasonable profile control decision-making and optimization, including the screening of profile control well, the optimization of construction parameter,
Effect prediction and evaluation etc..
At present, well is selected for land oil field block integral profile control, more ripe technology has pressure index (PI) decision-making skill
Art, reservoir engineering (RE) decision-making technic and numerical simulation (RS) decision-making technic.Patent CN1173581A discloses a kind of using note
Well well head falloff curve calculate obtained by the pressure index method that carries out decision-making, it has workable, decision surface wide, certainly
The rapid advantage of plan.Patent CN1560429 discloses a kind of decision-making technique for considering the anisotropism on block plane and longitudinal direction,
Monthly data is produced using water injection well falloff curve, intake profile, oil-water well corresponding relation, oil-water well and with brill electrical measurement data etc.
Data, comes Calculation Plane anisotropism decision-making coefficient and vertical heterogeneity decision-making coefficient, is that foundation is carried out with these decision-making coefficients
Block integral profile control selects well decision-making, with comprehensive, system, objective advantage.
Although above-mentioned land oil field block profile control well selection decision-making technic respectively has advantage, for offshore oilfield, these
Decision-making technic is not applied to simultaneously, particularly Offshore Heavy Oil Field oil reservoir, and reason is that viscous crude has the property such as viscosity is big, density is high, Flowing Hard
Matter, therefore, as the decision index system of well is selected it is have very much using viscosity of crude for Offshore Heavy Oil Field reservoir profile selects well decision-making
It is necessary, and existing Block Profile Control selects well decision-making technique not to be classified as wherein viscosity parameter, this greatly governs existing tune
Cut open the application for selecting well decision-making technic at sea heavy crude reservoir.
The content of the invention
Regarding to the issue above, it is an object of the invention to provide it is a kind of by viscosity of crude list in decision index system suitable for sea
The profile control well selection decision-making technique of heavy crude reservoir.
To achieve the above object, the present invention uses following technical scheme：A kind of profile control choosing suitable for Offshore Heavy Oil Field oil reservoir
Well decision-making technique, comprises the following steps：
1) the single factor test index in profile control well selection decision-making is divided according to Criterion Attribute；
2) numerical value of water injection well comprehensive evaluation index to be evaluated is calculated；
3) average value of the block water injection well comprehensive evaluation index is calculated；
4) by step 2) in numerical value and the step 3 of water injection well comprehensive evaluation index to be evaluated that obtain) in obtain should
The average value of block water injection well comprehensive evaluation index is compared and then whether decision-making water injection well to be evaluated needs to carry out profile control to arrange
Apply.
The step 1) in, the single factor test index in profile control well selection decision-making is divided into oil reservoir static state according to Criterion Attribute and is referred to
Mark, Production development index and Monitoring Indexes three major types；Wherein, oil reservoir Static State Index includes viscosity of crude, viscosity of crude level
Difference, coefficient of permeability variation, effective pay thickiness and mean permeability；Production development index includes apparent water injectivity index and averagely contains
Water rate；Monitoring Indexes include intake profile coefficient of heterogeneity and wellhead of water injection well pressure drop index.
The step 2) in, the numerical value acquisition process of water injection well comprehensive evaluation index to be evaluated is as follows：1. determine marine
The judge weight of each single factor test index in viscous crude profile control well selection decision model；2. water injection well to be evaluated is calculated in profile control well selection decision-making
The degree of membership numerical value of middle single factor evaluation index；3. the numerical value of water injection well comprehensive evaluation index to be evaluated is calculated.
The step 2) in, the judge weight computations of each single factor test index in Offshore Heavy Oil Field profile control well selection decision model
It is as follows:
Weight shared by each attribute of existing Offshore Heavy Oil Field oil reservoir is as follows：
In existing Offshore Heavy Oil Field oil reservoir in each attribute each single factor test index to account for weight in its attribute as follows：
Calculating can obtain weight of each single factor test index in whole decision model, and wherein viscosity of crude weight is
0.0106, the differential weight of viscosity of crude is 0.0206, and coefficient of permeability variation weight is 0.0543, and mean permeability weight is
0.0330, effective pay thickiness weight is 0.0125, and apparent water injectivity index weight is 0.0694, and average moisture content weight is
0.1387, intake profile coefficient of heterogeneity weight is 0.3304, and well head pressure drop index weight is 0.3304.
The step 2) in, water injection well to be evaluated degree of membership numerical value of single factor evaluation index in profile control well selection decision-making
Acquisition process is as follows：
The degree of membership of single factor evaluation index in profile control well selection decision-making is calculated using trapezoidal profile membership function, what it was used
Trapezoidal profile membership function Mathematical Modeling is divided into the distribution of liter ladder type and drop ladder type distribution, its such as following formula (1) and formula (2),
Ladder type distribution is risen, it is more big more excellent type：
Drop ladder type distribution, it is smaller more excellent type：
In view of the situation of practical problem, the distribution of both parabolic types can rise parabolic type distribution such as formula (3) by abbreviation：
Drop parabolic type distribution is such as formula (4)：
In formula, a1、a2The minimum value and maximum of single factor evaluation index respectively in profile control well selection decision-making, u are to be evaluated
The single factor test index of water injection well；μAIt is the degree of membership of the single factor evaluation index of water injection well to be evaluated；
Determine that the degree of membership numerical value detailed process of each single factor test index is as follows according to above-mentioned trapezoidal profile membership function：
Viscosity of crude calculates the degree of membership numerical value of water injection well viscosity of crude to be evaluated, knot using ladder type model Chinese style (3) is risen
Fruit is designated as a；
The differential degree of membership numerical value differential using ladder type model Chinese style (3) calculating water injection well viscosity to be evaluated is risen of viscosity, knot
Fruit is designated as b；
Effective pay thickiness calculates the degree of membership of water injection well effective pay thickiness to be evaluated using ladder type model Chinese style (3) is risen
Numerical value, is as a result designated as c；
Mean permeability is subordinate to the number of degrees using liter ladder type model Chinese style (3) calculating water injection well mean permeability to be evaluated
Value, is as a result designated as d；
Coefficient of permeability variation calculates the person in servitude of water injection well coefficient of permeability variation to be evaluated using ladder type model Chinese style (3) is risen
Category number of degrees value, is as a result designated as e；
The intake profile coefficient of variation calculates the profile-log of water injection coefficient of variation to be evaluated using ladder type model Chinese style (3) is risen
Degree of membership numerical value, be as a result designated as f；
Wellhead of water injection well pressure drop index calculates wellhead of water injection well pressure drop index to be evaluated using drop ladder type model Chinese style (4)
Degree of membership numerical value, is as a result designated as g；
Apparent water injectivity index is subordinate to the number of degrees using liter ladder type model Chinese style (3) calculating water injection well apparent water injectivity index to be evaluated
Value, is as a result designated as h；
Average moisture content is subordinate to the number of degrees using liter ladder type model Chinese style (3) calculating water injection well average moisture content to be evaluated
Value, is as a result designated as i.
The step 2) in, water injection well comprehensive evaluation index acquisition process to be evaluated is by as follows：
The above-mentioned single factor test index degree of membership numerical value being calculated is obtained into water injection well to be evaluated with corresponding multiplied by weight
The numerical value A of comprehensive evaluation index, computing formula such as following formula (8)：
A=0.0106a+0.0206b+0.0125c+0.0330d+0.0543e+0.3304f+
0.3304·
g+0.0694·h+0.1387·i。 (8)
The step 3) in the block water injection well comprehensive evaluation index average value-acquiring method it is as follows：
The all water injection wells of the block are first calculated the numerical value A of corresponding comprehensive evaluation index, then seeks its average value
Its formula such as following formula (9)
In formula, A1、A2、A3···An-1、AnRespectively refer to the 1st, 2,3 to n-1, n mouthfuls of water injection well.
The step 4) in water injection well to be evaluated whether need the decision process for carrying out profile control measures as follows：
By step 2) in calculate water injection well to be evaluated comprehensive evaluation index numerical value and step 3) in calculate
The average value of each water injection well comprehensive evaluation index of this block is compared, if its result of calculation is bigger more than block average value,
This water injection well is got over to be needed to carry out profile control measures, and profile control measures need not be carried out if its result of calculation subaverage.
Due to taking above technical scheme, it has advantages below to the present invention：1st, heavy crude reservoir profile control at sea of the invention
Select the influence that viscosity of crude has been taken into full account in well decision-making so that profile control well selection decision-making technique is more accurate.2nd, adopted in the present invention
Every weights are calculated with analytic hierarchy process (AHP), human factor influence is eliminated so that profile control well selection decision-making technique more science, conjunction
Reason.
Brief description of the drawings
Fig. 1 is the liter ladder type illustraton of model of membership function in the present invention；
Fig. 2 is the drop ladder type illustraton of model of membership function in the present invention；
Fig. 3 is the schematic diagram of the Lorenz coefficient description of permeability anisotropism of the present invention.
Specific embodiment
The present invention is described in detail with reference to the accompanying drawings and examples.
A kind of profile control well selection decision-making technique suitable for Offshore Heavy Oil Field oil reservoir provided by the present invention, it includes following step
Suddenly：
1) the single factor test index in profile control well selection decision-making is divided into oil reservoir Static State Index, Production development according to Criterion Attribute to refer to
Mark and Monitoring Indexes three major types.
Wherein, oil reservoir Static State Index includes that viscosity of crude, differential viscosity of crude, coefficient of permeability variation, oil reservoir are effectively thick
Degree and mean permeability；Production development index includes apparent water injectivity index and average moisture content；Monitoring Indexes are cutd open including water suction
Face coefficient of heterogeneity and wellhead of water injection well pressure drop index.
2) numerical value of water injection well comprehensive evaluation index to be evaluated is calculated, detailed process is as follows：
1. the judge weight of each single factor test index in Offshore Heavy Oil Field profile control well selection decision model is determined
Weight shared by each attribute of existing Offshore Heavy Oil Field oil reservoir is as follows：
In existing Offshore Heavy Oil Field oil reservoir in each attribute each single factor test index to account for weight in its attribute as follows：
Calculating can obtain weight such as table 1 below of each single factor test index in whole decision model：
Table 1
| Profile control well selection index | Weight |
| Viscosity of crude | 0.0106 |
| Viscosity of crude is differential | 0.0206 |
| Coefficient of permeability variation | 0.0543 |
| Mean permeability | 0.0330 |
| Effective pay thickiness | 0.0125 |
| Apparent water injectivity index | 0.0694 |
| Average moisture content | 0.1387 |
| Intake profile coefficient of heterogeneity | 0.3304 |
| Well head pressure drop index | 0.3304 |
2. the degree of membership numerical value of water injection well to be evaluated single factor evaluation index in profile control well selection decision-making is calculated
The present invention calculates the degree of membership of single factor test index in profile control well selection decision-making using trapezoidal profile membership function.It is used
Trapezoidal profile membership function Mathematical Modeling be divided into the distribution of liter ladder type and drop ladder type distribution, it is as shown such as following formula (1) and formula (2).
As shown in figure 1, rising ladder type distribution (more big more excellent type)：
As shown in Fig. 2 drop ladder type distribution (smaller more excellent type)：
In view of the situation of practical problem, the distribution of both parabolic types can rise parabolic type distribution such as formula (3) by abbreviation：
Drop parabolic type distribution is such as formula (4)：
In formula, a1、a2The minimum value and maximum of single factor evaluation index respectively in profile control well selection decision-making；U is to be evaluated
The single factor test index of water injection well；μAIt is the degree of membership of the single factor evaluation index of water injection well to be evaluated.
Determine that the degree of membership numerical value detailed process of each single factor test index is as follows according to above-mentioned trapezoidal profile membership function：
Viscosity of crude：In plane, carry out selecting well decision-making using viscosity of crude relative size.Viscosity of crude is bigger, injects water
Fingering phenomenon is more obvious, more needs transfer drive, belongs to more big more excellent type.The viscosity of crude of all wells of this block is first obtained out, so
Minimum value is set to a afterwards1, maximum is set to a2, water injection well viscosity of crude to be evaluated is calculated by formula (3) using liter ladder type model
Degree of membership numerical value, be as a result designated as a；
Viscosity is differential：On longitudinal direction, using viscosity of crude difference between the differential reaction different layers of viscosity.Viscosity is differential bigger,
The injection easier channelling of water, more needs transfer drive, belongs to more big more excellent type.The viscosity for first obtaining out all wells of this block is differential,
Then minimum value is set to a1, maximum is set to a2, water injection well viscosity grade to be evaluated is calculated by formula (3) using liter ladder type model
Poor degree of membership numerical value, is as a result designated as b.
Effective pay thickiness：Injection water channeling easily occurs inside thick oil pay, such as positive rhythm formation bottom and anti-rhythm oil
Layer top.Effective pay thickiness is bigger, more needs transfer drive, belongs to more big more excellent type.First obtain out the oil reservoir of all wells of this block
Effective thickness, is then set to a by minimum value1, maximum is set to a2, water filling to be evaluated is calculated by formula (3) using liter ladder type model
The degree of membership numerical value of well effective pay thickiness, is as a result designated as c.
Mean permeability：Oil reservoir mean permeability is calculated using weighting method.Oil reservoir mean permeability is bigger, easier formation
Predominant pathway, more needs transfer drive, belongs to more big more excellent type.The mean permeability of all wells of this block is first obtained out, then will
Minimum value is set to a1, maximum is set to a2, water injection well mean permeability to be evaluated is calculated by formula (3) using liter ladder type model
Degree of membership numerical value, is as a result designated as d.
Coefficient of permeability variation：Coefficient of permeability variation is bigger, and injection ripples and degree of irregularity are higher, remaining oil enrichment
Hyposmosis position.Coefficient of permeability variation is bigger, more needs transfer drive, belongs to more big more excellent type.The present invention is using Lorenz system
Counting method is solved, and its formula is following (5)：
V=SADCA/ABCA (5)
In formula, V is coefficient of permeability variation；SADCAIt is the zero dimension area of curl shape ADCA；SABCAIt is triangle ABCA's
Zero dimension area, its image is as shown in Figure 3.
The coefficient of permeability variation of all wells of this block is calculated, minimum value is then set to a1, maximum is set to a2
It is the degree of membership numerical value that formula (3) calculates water injection well coefficient of permeability variation to be evaluated using liter ladder type model, as a result
It is designated as e.
The intake profile coefficient of variation：The intake profile coefficient of variation is bigger, and vertical heterogeneity is more serious, and waterflooding effect is got over
Difference, the follow-up recovery factor potential that improves is bigger, more needs transfer drive, belongs to more big more excellent type.The present invention is using Lorenz coefficient side
Method solves the intake profile coefficient of variation of all wells of this block, and minimum value then is set into a1, maximum is set to a2.Using liter
Ladder type model calculates the degree of membership numerical value of the profile-log of water injection coefficient of variation to be evaluated by formula (3), is as a result designated as f.
Wellhead of water injection well pressure drop index：Intake wellhead pressure depression curve refers to that injection well closing well in normal water filling is surveyed
The change of well head pressure is calculated according to such as following formula (6)：
In formula, PI is pressure index, units MPa；P (t) changes with time for wellhead of water injection well pressure, units MPa；t
It is testing time, unit min.
In order that water injection well PI values can have comparativity with other water injection wells PI values in block, using such as following formula (7) by PI
Value is corrected under conditions of same injection index
In formula, PIRepairIt is the PI values of water injection well amendment, units MPa；PI is the observed pressure index of water injection well, units MPa；
Q/h is water injection well injection index, unit m3/(d·m)；It is block water injection well mean water absorption intensity, unit m3/(d·m)。
PI values are one being measured from wellhead of water injection well relevant with formation capacity (product of permeability and core intersection)
Pressure mean values, PI values are smaller, and formation capacity is bigger.If stratum is with the presence of macropore or high permeability zone, i.e. good penetrability, then PI
Value is small, so should just select those less wells of PI values during the well point of selection transfer drive, belongs to smaller more excellent type.First obtain out this
The well head pressure drop index of all wells of block, is then set to a by minimum value1, maximum is set to a2, formula is passed through using drop ladder type model
(4) the degree of membership numerical value of wellhead of water injection well pressure drop index to be evaluated is calculated, g is as a result designated as.
Apparent water injectivity index：Apparent water injectivity index is diurnal injection under unit well head pressure, and value is bigger, more needs profile control, belongs to
More big more excellent type.The apparent water injectivity index of all wells of this block is first obtained out, minimum value is then set to a1, maximum is set to a2, adopt
The degree of membership numerical value of water injection well apparent water injectivity index to be evaluated is calculated by formula (3) with liter ladder type model, h is as a result designated as.
Average moisture content：Target well group average moisture content is higher, more needs to carry out steady oil control water by profile control, belongs to bigger
More excellent type.The average moisture content of all wells of this block is first obtained out, minimum value is then set to a1, maximum is set to a2, using liter
Ladder type model calculates the degree of membership numerical value of water injection well average moisture content to be evaluated by formula (3), is as a result designated as i.
3. the numerical value of water injection well comprehensive evaluation index to be evaluated is calculated
The single factor test index degree of membership numerical value of above-mentioned calculating and corresponding multiplied by weight are obtained into water injection well synthesis to be evaluated
The numerical value A of evaluation index, computing formula such as following formula (8)：
A=0.0106a+0.0206b+0.0125c+0.0330d+0.0543e+0.3304f+
0.3304·
g+0.0694·h+0.1387·i。 (8)
3) all water injection wells of the block are calculated the numerical value A of corresponding comprehensive evaluation index, then seeks its average value
Its formula such as following formula (9)
In formula, A1、A2、A3···An-1、AnReference the 1st, 2,3n-1, n mouthful water injection well respectively.
4) judge whether water injection well to be evaluated needs to carry out profile control measures.
By step 2) in calculate water injection well to be evaluated comprehensive evaluation index numerical value and step 3) in calculate
The average value of each water injection well comprehensive evaluation index of this block is compared, if its result of calculation exceedes block average value, this note
Well is needed to carry out profile control measures, and profile control measures need not be carried out if its result of calculation subaverage.
The various embodiments described above are only used for having carried out further specifically the purpose of the present invention, technical scheme and beneficial effect
It is bright, it is not intended to limit the invention, all any modification, equivalent substitution and improvements within the spirit and principles in the present invention, done
Deng should be included within the scope of the present invention.
Claims (8)
1. a kind of profile control well selection decision-making technique suitable for Offshore Heavy Oil Field oil reservoir, comprises the following steps：
1) the single factor test index in profile control well selection decision-making is divided according to Criterion Attribute；
2) numerical value of water injection well comprehensive evaluation index to be evaluated is calculated；
3) average value of the block water injection well comprehensive evaluation index is calculated；
4) by step 2) in numerical value and the step 3 of water injection well comprehensive evaluation index to be evaluated that obtain) in the block that obtains
The average value of water injection well comprehensive evaluation index is compared and then whether decision-making water injection well to be evaluated needs to carry out profile control measures.
2. a kind of profile control well selection decision-making technique suitable for Offshore Heavy Oil Field oil reservoir as claimed in claim 1, it is characterised in that：Institute
State step 1) in, the single factor test index in profile control well selection decision-making is divided into oil reservoir Static State Index, production according to Criterion Attribute and is moved
State index and Monitoring Indexes three major types；Wherein, oil reservoir Static State Index includes that viscosity of crude, viscosity of crude be differential, permeability
The coefficient of variation, effective pay thickiness and mean permeability；Production development index includes apparent water injectivity index and average moisture content；Dynamic
Monitoring index includes intake profile coefficient of heterogeneity and wellhead of water injection well pressure drop index.
3. a kind of profile control well selection decision-making technique suitable for Offshore Heavy Oil Field oil reservoir as claimed in claim 2, it is characterised in that：Institute
State step 2) in, the numerical value acquisition process of water injection well comprehensive evaluation index to be evaluated is as follows：1. the choosing of Offshore Heavy Oil Field profile control is determined
The judge weight of each single factor test index in well decision model；2. water injection well to be evaluated single factor test in profile control well selection decision-making is calculated to comment
The degree of membership numerical value of valency index；3. the numerical value of water injection well comprehensive evaluation index to be evaluated is calculated.
4. a kind of profile control well selection decision-making technique suitable for Offshore Heavy Oil Field oil reservoir as claimed in claim 3, it is characterised in that：Institute
State step 2) in, the judge weight computations of each single factor test index are as follows in Offshore Heavy Oil Field profile control well selection decision model:
Weight shared by each attribute of existing Offshore Heavy Oil Field oil reservoir is as follows：
In existing Offshore Heavy Oil Field oil reservoir in each attribute each single factor test index to account for weight in its attribute as follows：
Calculating can obtain weight of each single factor test index in whole decision model, and wherein viscosity of crude weight is 0.0106,
The differential weight of viscosity of crude is 0.0206, and coefficient of permeability variation weight is 0.0543, and mean permeability weight is 0.0330, oil
Layer effective thickness weight is 0.0125, and apparent water injectivity index weight is 0.0694, and average moisture content weight is 0.1387, intake profile
Coefficient of heterogeneity weight is 0.3304, and well head pressure drop index weight is 0.3304.
5. a kind of profile control well selection decision-making technique suitable for Offshore Heavy Oil Field oil reservoir as claimed in claim 4, it is characterised in that：Institute
State step 2) in, the acquisition process of water injection well to be evaluated degree of membership numerical value of single factor evaluation index in profile control well selection decision-making is such as
Under：
The degree of membership of single factor evaluation index in profile control well selection decision-making is calculated using trapezoidal profile membership function, it is trapezoidal that it is used
Distribution membership function Mathematical Modeling is divided into the distribution of liter ladder type and drop ladder type distribution, its such as following formula (1) and formula (2),
Ladder type distribution is risen, it is more big more excellent type：
Drop ladder type distribution, it is smaller more excellent type：
In view of the situation of practical problem, the distribution of both parabolic types can rise parabolic type distribution such as formula (3) by abbreviation：
Drop parabolic type distribution is such as formula (4)：
In formula, a1、a2The minimum value and maximum of single factor evaluation index respectively in profile control well selection decision-making, u are water filling to be evaluated
The single factor test index of well；μAIt is the degree of membership of the single factor evaluation index of water injection well to be evaluated；
Determine that the degree of membership numerical value detailed process of each single factor test index is as follows according to above-mentioned trapezoidal profile membership function：
Viscosity of crude calculates the degree of membership numerical value of water injection well viscosity of crude to be evaluated using ladder type model Chinese style (3) is risen, and as a result remembers
It is a；
The differential degree of membership numerical value differential using ladder type model Chinese style (3) calculating water injection well viscosity to be evaluated is risen of viscosity, as a result remembers
It is b；
Effective pay thickiness is subordinate to the number of degrees using liter ladder type model Chinese style (3) calculating water injection well effective pay thickiness to be evaluated
Value, is as a result designated as c；
Mean permeability calculates the degree of membership numerical value of water injection well mean permeability to be evaluated, knot using ladder type model Chinese style (3) is risen
Fruit is designated as d；
Coefficient of permeability variation calculates the degree of membership of water injection well coefficient of permeability variation to be evaluated using ladder type model Chinese style (3) is risen
Numerical value, is as a result designated as e；
The intake profile coefficient of variation calculates the person in servitude of the profile-log of water injection coefficient of variation to be evaluated using ladder type model Chinese style (3) is risen
Category number of degrees value, is as a result designated as f；
Wellhead of water injection well pressure drop index calculates being subordinate to for wellhead of water injection well pressure drop index to be evaluated using drop ladder type model Chinese style (4)
Number of degrees value, is as a result designated as g；
Apparent water injectivity index calculates the degree of membership numerical value of water injection well apparent water injectivity index to be evaluated, knot using ladder type model Chinese style (3) is risen
Fruit is designated as h；
Average moisture content calculates the degree of membership numerical value of water injection well average moisture content to be evaluated, knot using ladder type model Chinese style (3) is risen
Fruit is designated as i.
6. a kind of profile control well selection decision-making technique suitable for Offshore Heavy Oil Field oil reservoir as claimed in claim 5, it is characterised in that：Institute
State step 2) in, water injection well comprehensive evaluation index acquisition process to be evaluated is by as follows：
The above-mentioned single factor test index degree of membership numerical value being calculated is obtained into water injection well synthesis to be evaluated with corresponding multiplied by weight
The numerical value A of evaluation index, computing formula such as following formula (8)：
A=0.0106a+0.0206b+0.0125c+0.0330d+0.0543e+0.3304f+0.3304
g+0.0694·h+0.1387·i (8) 。
7. a kind of profile control well selection decision-making technique suitable for Offshore Heavy Oil Field oil reservoir as claimed in claim 1, it is characterised in that：Institute
State step 3) in the block water injection well comprehensive evaluation index average value-acquiring method it is as follows：
The all water injection wells of the block are first calculated the numerical value A of corresponding comprehensive evaluation index, then seeks its average valueIt is public
Formula such as following formula (9)
In formula, A1、A2、A3···An-1、AnRespectively refer to the 1st, 2,3 to n-1, n mouthfuls of water injection well.
8. a kind of profile control well selection decision-making technique suitable for Offshore Heavy Oil Field oil reservoir as claimed in claim 1, it is characterised in that：Institute
State step 4) in water injection well to be evaluated whether need the decision process for carrying out profile control measures as follows：
By step 2) in calculate water injection well to be evaluated comprehensive evaluation index numerical value and step 3) in the local area that calculates
The average value of each water injection well comprehensive evaluation index of block is compared, if its result of calculation is bigger more than block average value, this note
Well is got over to be needed to carry out profile control measures, and profile control measures need not be carried out if its result of calculation subaverage.
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