CN104806231A - Quantitative evaluation method of heavy oil steam stimulation water flooded layer - Google Patents

Quantitative evaluation method of heavy oil steam stimulation water flooded layer Download PDF

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Publication number
CN104806231A
CN104806231A CN201410039138.2A CN201410039138A CN104806231A CN 104806231 A CN104806231 A CN 104806231A CN 201410039138 A CN201410039138 A CN 201410039138A CN 104806231 A CN104806231 A CN 104806231A
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water
formula
resistivity
water flooding
flooding layer
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CN104806231B (en
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李伟忠
刘西雷
牛丽娟
王玉环
梁金萍
路言秋
安洁
陈明铭
赵衍彬
吴兆徽
崔卫东
宿文浩
孙钰
韩文杰
战艾婷
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China Petroleum and Chemical Corp
Sinopec Shengli Geological Scientific Reserch Institute
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China Petroleum and Chemical Corp
Sinopec Shengli Geological Scientific Reserch Institute
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00—Survey of boreholes or wells
    • E21B47/10—Locating fluid leaks, intrusions or movements
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells

Abstract

The invention provides a quantitative evaluation method of a heavy oil steam stimulation water flooded layer. The quantitative evaluation method of the heavy oil steam stimulation water flooded layer comprises the following steps: step 1, determining resistivity of mixed formation water of the heavy soil stimulation water flooded layer according to analysis assay data or logging curve data of the formation water of the water flooded layer; step 2, calculating oil reservoir water saturation Sw according to rock resistivity of a coring well by using an archies formula on the basis of determining the resistivity of the mixed formation water of the heavy oil stimulation water flooded layer; step 3, calculating oil displacement efficiency eta of the water flooded layer according to the calculated oil reservoir water saturation Sw and oil-water relative permeability test data of the coring well; step 4, establishing a heavy oil stimulation water flooding degree judgment standard to realize quantitative judgment and recognition of the water flooding degree of the heavy oil stimulation. The quantitative evaluation method of the heavy oil steam stimulation water flooded layer has better operability, contributes to generalization, and provides a practical and feasible method for fine description of the heavy oil reservoir stimulation water flooded layer.

Description

The method for quantitatively evaluating of thickened oil steam-stimulated Water Flooding Layer
Technical field
The present invention relates to oil field development technical field, particularly relate to a kind of method for quantitatively evaluating of thickened oil steam-stimulated Water Flooding Layer.
Background technology
At present, the main object of each elephant water logging evaluation is that (viscosity of crude value is generally less than 50mPas to water drive ligh-oil reservoir, and oil density is less than 0.9200g/cm 3), its evaluation method is not also suitable for steam soak heavy crude reservoir (viscosity of crude value is generally greater than 50mPas, and oil density is greater than 0.9200g/cm 3), be mainly reflected in the following aspects:
1, the exploitation of thick oil filling steam soak is a batch production mode,---stewing well---oil recovery---steam injection that its development process is steam injection, with water filling drive exploit continuously maximum difference be exactly in manufacturing process the component of production fluid be unstable, water flooding degree can not be judged intuitively from producing water ratio;
2, the vapour density injected in thick oil filling cyclic steam stimulation process is little, can move above oil reservoir after the implantation and onlap phenomenon occurs, from steam injection center distally steam gradually condensation become water, move down due to Action of Gravity Field condensed water and cause water logging bottom oil reservoir.So from easily causing top water logging close to well of handling up, from away from well of handling up based on bottom water logging.The salinity of steam condensate (SC) is low, belongs to fresh water water logging.Larger difference is had with the edge-bottom water water logging of waterflooding development ligh-oil reservoir.
In order to accurate description factor of cyclic steam stimulation in heavy oil reservoir rule of waterflooding, need to set up new evaluation method.We have invented thickened oil steam-stimulated water logging method for quantitatively evaluating for this reason, solve above technical problem.
Summary of the invention
The object of this invention is to provide a kind of method for quantitatively evaluating achieving the thickened oil steam-stimulated Water Flooding Layer of the object of thickened oil steam-stimulated water flooding degree quantitative assessment.
Object of the present invention realizes by following technical measures: the method for quantitatively evaluating of thickened oil steam-stimulated Water Flooding Layer, the method for quantitatively evaluating of this thickened oil steam-stimulated Water Flooding Layer comprises: step 1, according to Water Flooding Layer formation water analytical test data or borehole log data, determine viscous crude handle up Water Flooding Layer mixing formation water resistivity; Step 2, determining that viscous crude is handled up on the basis of Water Flooding Layer mixing formation water resistivity, according to the rock resistivity experimental data of core hole, utilizing Archie formula, calculating oil reservoir water saturation S w; Step 3, according to the oil reservoir water saturation S calculated wwith core hole oil-water relative permeability experimental data, calculate Water Flooding Layer oil displacement efficiency η; And step 4, set up viscous crude and to handle up water flooding degree criterion, realize viscous crude and to handle up the rational judgment of water flooding degree and identification.
Object of the present invention also realizes by following technical measures:
In step 1, for the well having formation water water analysis data, the water analysis data determination viscous crude of this well target zone position is adopted to handle up Water Flooding Layer mixing formation water resistivity R z, in the mixing salt solution of stratum, with NaCl solution when 18 DEG C for standard, the equivalent coefficient K of various ion when determining that other various solution and NaCl solution have a same electrical conductance i, then calculate equivalent N aCl total salinity P we:
P we=∑ K i× P i(formula 1)
In formula: P iwith K i-be respectively salinity and the equivalent coefficient of i-th kind of ion,
According to equivalent N aCl total salinity, look into the plate viscous crude can obtained under formation temperature conditions and to handle up Water Flooding Layer mixing formation water resistivity R z.
In step 1, for the well not having water analysis data, the approximate viscous crude of asking for of nutural potential logging curve data is adopted to handle up Water Flooding Layer mixing formation water resistivity R z, nutural potential logging curve data carries out after well, intrusion, thickness and electrofiltration potential impact etc. correct, and carries out viscous crude to handle up Water Flooding Layer mixing formation water resistivity R by following formula zcalculating:
SSP=-K × lg (R mft/ R z) (formula 2)
In formula:
The static spontaneous potential (SSP) value on SSP-stratum, mV;
K-natural potential coefficient, μm 2;
R mftmud filtrate resistivity during-t DEG C, Ω m;
R z-Water Flooding Layer mixing formation water resistivity, Ω m;
Can be obtained by formula 2
LgR z=-SSP/K+lgR mft(formula 3)
In formula 3, SSP can be tried to achieve by the natural potential value after overcorrect,
K can be obtained by following formula:
K = 70.7 × 273 + t 273 + 25 (formula 4)
In formula, t is F temperature, DEG C;
R mftall conversions can be obtained by the mud resistivity under normal temperature, therefore viscous crude is handled up Water Flooding Layer mixing formation water resistivity R zcan be tried to achieve by formula 3 and formula 4 simultaneous.
In step 2, oil reservoir water saturation S is calculated wdesign formulas be:
S w = a × b × R z R t × φ m n (formula 5)
In formula:
A, b-lithology factor;
M-cementation factor;
N-saturation exponent;
R t-resistivity reservoir, Ω m;
R z-Water Flooding Layer mixing formation water resistivity, Ω m;
Lithology factor a, b and cementation factor m in formula, saturation exponent are only relevant with lithology, and they represent that the distribution situation of profits in hole is on the impact of oil-bearing rock resistivity, is obtained by core hole rock-electric test data.
, in step 3, the design formulas calculating Water Flooding Layer oil displacement efficiency η is:
η = S w - S wi 1 - S wi (formula 6)
In formula:
η-Water Flooding Layer oil displacement efficiency, %;
S wthe current water saturation of-Water Flooding Layer, f;
S wi-Water Flooding Layer initial irreducible water saturation, f.
In step 4, according to the viscous crude determined of Water Flooding Layer oil displacement efficiency η calculated water flooding degree criterion of handling up be:
Non-water logging: η≤5%;
Weak water logging: 5% < η≤20%;
Middle water logging: 20% < η≤40%;
Strong water logging: 40% < η≤60%;
Extra-heavy water logging: η > 60%.
The method for quantitatively evaluating of the thickened oil steam-stimulated Water Flooding Layer in the present invention, technical thought is clear, application is simple, establish thickened oil steam-stimulated water logging method for quantitatively evaluating, there is good operability, there is novelty, practicality, be beneficial to popularization, for the handle up fine description of Water Flooding Layer of heavy crude reservoir provides practicable method.
Accompanying drawing explanation
Fig. 1 is the flow chart of a specific embodiment of the method for quantitatively evaluating of thickened oil steam-stimulated Water Flooding Layer of the present invention.
Detailed description of the invention
For making above and other object of the present invention, feature and advantage can become apparent, cited below particularly go out preferred embodiment, and coordinate institute's accompanying drawings, be described in detail below.
As shown in Figure 1, Fig. 1 is the flow chart of a specific embodiment of the method for quantitatively evaluating of thickened oil steam-stimulated Water Flooding Layer of the present invention.
In step 101, according to Water Flooding Layer formation water analytical test data or borehole log data, determine viscous crude handle up Water Flooding Layer mixing formation water resistivity.For the well having formation water water analysis data, adopt the water analysis data determination steam soak Water Flooding Layer mixing formation water resistivity R of this well target zone position z.In the mixing salt solution of stratum, because the mobility of various ion is different, thus its conductive capability is not identical yet.General with NaCl solution when 18 DEG C for standard (gets Na +, Cl -the weight coefficient of ion is 1), the equivalent coefficient K of various ion when determining that other various solution and NaCl solution have a same electrical conductance i, then calculate equivalent N aCl total salinity P we:
P we=∑ K i× P i(formula 1)
In formula: P iwith K i-be respectively salinity and the equivalent coefficient of i-th kind of ion.
According to equivalent N aCl total salinity, look into plate and can obtain the Water Flooding Layer mixing formation water resistivity R that handles up under formation temperature conditions z.
For the well not having water analysis data, formation water (mixed liquor) resistivity R can be asked for nutural potential logging curve (SP) data are approximate z.SP curve data can carry out the calculating of resistivity of mixed after carrying out the corrections such as well, intrusion, thickness and electrofiltration potential impact by following formula:
SSP=-K × lg (R mft/ R z) (formula 2)
In formula:
The static spontaneous potential (SSP) value on SSP-stratum, mV;
K-natural potential coefficient, μm 2;
R mftmud filtrate resistivity during-t DEG C, Ω m;
R z-Water Flooding Layer mixing formation water resistivity, Ω m;
Can be obtained by formula 2
LgR z=-SSP/K+lgR mft(formula 3)
In formula 3, SSP can be tried to achieve by the natural potential value after overcorrect.
K can be obtained by following formula:
K = 70.7 &times; 273 + t 273 + 25 (formula 4)
In formula, t is F temperature, DEG C;
R mftall conversions can be obtained by the mud resistivity under normal temperature, therefore R zcan be tried to achieve by (formula 3) and (formula 4) simultaneous.Flow process enters into step 102.
In step 102, on the basis determining resistivity of mixed, according to the rock resistivity experimental data of core hole, utilize A Erqi (Archie) formula, calculate oil reservoir water saturation S w, design formulas is;
S w a &times; b &times; R z R t &times; &phi; m n (formula 5)
In formula:
A, b-lithology factor;
M-cementation factor;
N-saturation exponent;
R t-resistivity reservoir, Ω m;
R z-Water Flooding Layer mixing formation water resistivity, Ω m;
Lithology factor a, b and cementation factor m in formula, saturation exponent are only relevant with lithology, and they represent that the distribution situation of profits in hole is on the impact of oil-bearing rock resistivity, obtains by core hole rock-electric test data.Flow process enters into step 103.
In step 103, according to the water saturation S calculated wwith core hole oil-water relative permeability experimental data, calculate Water Flooding Layer oil displacement efficiency η.In step 3, on above basis, according to core hole oil-water relative permeability experimental data, can calculate Water Flooding Layer oil displacement efficiency η, its design formulas is:
&eta; = S w - S wi 1 - S wi (formula 6)
In formula:
η-Water Flooding Layer oil displacement efficiency, %;
S wthe current water saturation of-Water Flooding Layer, f;
S wi-Water Flooding Layer initial irreducible water saturation, f;
Water Flooding Layer oil displacement efficiency η can be calculated thus.Flow process enters into step 104.
In step 104, set up viscous crude and to handle up water flooding degree criterion, finally realize viscous crude and to handle up the rational judgment of water flooding degree and identification.In step 4, according to the Water Flooding Layer oil displacement efficiency η calculated, in conjunction with known core hole core analysis with oil displacement efficiency and operation initial production situation, establish viscous crude and to handle up water flooding degree criterion:
Non-water logging: η≤5%;
Weak water logging: 5% < η≤20%;
Middle water logging: 20% < η≤40%;
Strong water logging: 40% < η≤60%;
Extra-heavy water logging: η > 60%;
According to above standard, viscous crude can be realized and to handle up the rational judgment of water flooding degree and identification.Flow process terminates.
In an application specific embodiment of the present invention, in Gudao oilfield, two northern Ng5 viscous crude drops into Simulation on whole pay zones in 1992, at present, in the current brought in well number of two northern Ng5 133 mouthfuls, average individual well day oil ability 4.11t, comprehensive water cut 86.6%, tired oil 265.6 ten thousand tons, recovery percent of reserves 25.8%, cumulative gas-oil ratio 2.53, block has entered the High water cut stage.For above situation, thickened oil steam-stimulated Water Flooding Layer quantitative interpretation and evaluation are carried out to this block more than 10 mouth stepout well, have included following steps:
In step 1, for two northern Ng5 heavy crude heat extraction district stepout well A wells No. 3 floor in Gudao oilfield, this well formation water water analysis data are utilized, its Cl -ion concentration 2877.53mg/L, HCO 3 -ion concentration 467.90mg/L, Ca 2+ion concentration 77.60mg/L, Mg 2+ion concentration 10.03mg/L, Na ++ K +ion concentration 1935.26mg/L, can be obtained by formula 1:
P we=2877.53×1.0+467.90×0.42+77.6×0.96+10.03×1.4+1935.26×1.0=5097.85（mg/L）
According to equivalent N aCl total salinity 5097.85mg/L and ground temperature 60 DEG C, look into plate and draw Water Flooding Layer mixing formation water resistivity R zbe 0.60 Ω m.Simultaneously according to formula 2 ~ formula 4, the Water Flooding Layer mixing formation water resistivity R utilizing log to calculate zbe 0.58 Ω m, both corresponding situations are better.Finally, Water Flooding Layer mixing formation water resistivity R zvalue 0.60 Ω m.
In step 2, according to core hole rock resistivity parametric measurement experimental data, obtain this block target zone lithology factor a=0.7334, b=1.1934, m=1.3644, n=1.7934, substitute into Archie formula (Archie) and target zone water saturation S can be calculated w=0.5211.
In step 3, S can be obtained according to core hole oil-water relative permeability experimental data wi=0.1890, on above basis, Water Flooding Layer oil displacement efficiency η=40.95% can be calculated by formula.
In step 4, to handle up water flooding degree criterion according to viscous crude:
Non-water logging: η≤5%;
Weak water logging: 5% < η≤20%;
Middle water logging: 20% < η≤40%;
Strong water logging: 40% < η≤60%;
Extra-heavy water logging: η > 60%;
According to above standard, this well target zone oil displacement efficiency 40% < η≤60%, judges that this layer of water flooding degree is strong water logging.
According to this well go into operation after target zone the condition of production (table 1) contrast, evaluation result and practical condition matching degree better.
Two northern A wells No. 3 floor Water Flooding Layer quantitative assessment tables in table 1 Gudao oilfield
Thickened oil steam-stimulated Water Flooding Layer quantitative interpretation and evaluation have been carried out for two northern Ng5 viscous crude, 12 mouthfuls of stepout wells in Gudao oilfield, evaluation result is greater than 90% with the condition of production degree of agreement that brings in a well, achieve heavy crude heat extraction water logging steam soak water logging quantitative assessment, improve the precision that the remaining oil of heavy crude heat extraction Water Flooding Layer is described, for viscous crude handle up after development scheme change provide material base, achieve significant economic benefit.

Claims (6)

1. the method for quantitatively evaluating of thickened oil steam-stimulated Water Flooding Layer, is characterized in that, the method for quantitatively evaluating of this thickened oil steam-stimulated Water Flooding Layer comprises:
Step 1, according to Water Flooding Layer formation water analytical test data or borehole log data, determine viscous crude handle up Water Flooding Layer mixing formation water resistivity;
Step 2, determining that viscous crude is handled up on the basis of Water Flooding Layer mixing formation water resistivity, according to the rock resistivity experimental data of core hole, utilizing Archie formula, calculating oil reservoir water saturation S w;
Step 3, according to the oil reservoir water saturation S calculated wwith core hole oil-water relative permeability experimental data, calculate Water Flooding Layer oil displacement efficiency η; And
Step 4, sets up viscous crude and to handle up water flooding degree criterion, realizes viscous crude and to handle up the rational judgment of water flooding degree and identification.
2. the method for quantitatively evaluating of thickened oil steam-stimulated Water Flooding Layer according to claim 1, it is characterized in that, in step 1, for the well having formation water water analysis data, the water analysis data determination viscous crude of this well target zone position is adopted to handle up Water Flooding Layer mixing formation water resistivity R z, in the mixing salt solution of stratum, with NaCl solution when 18 DEG C for standard, the equivalent coefficient K of various ion when determining that other various solution and NaCl solution have a same electrical conductance i, then calculate equivalent N aCl total salinity P we:
P we=∑ K i× P i(formula 1)
In formula: P iwith K i-be respectively salinity and the equivalent coefficient of i-th kind of ion,
According to equivalent N aCl total salinity, look into the plate viscous crude can obtained under formation temperature conditions and to handle up Water Flooding Layer mixing formation water resistivity R z.
3. the method for quantitatively evaluating of thickened oil steam-stimulated Water Flooding Layer according to claim 1, it is characterized in that, in step 1, for the well not having water analysis data, the approximate viscous crude of asking for of nutural potential logging curve data is adopted to handle up Water Flooding Layer mixing formation water resistivity R z, nutural potential logging curve data carries out after well, intrusion, thickness and electrofiltration potential impact etc. correct, and carries out viscous crude to handle up Water Flooding Layer mixing formation water resistivity R by following formula zcalculating:
SSP=-K × lg (R mft/ R z) (formula 2)
In formula:
The static spontaneous potential (SSP) value on SSP-stratum, mV;
K-natural potential coefficient, μm 2;
R mftmud filtrate resistivity during-t DEG C, Ω m;
R z-Water Flooding Layer mixing formation water resistivity, Ω m;
Can be obtained by formula 2
LgR z=-SSP/K+lgR mft(formula 3)
In formula 3, SSP can be tried to achieve by the natural potential value after overcorrect,
K can be obtained by following formula:
K = 70.7 &times; 273 + t 273 + 25 (formula 4)
In formula, t is F temperature, DEG C;
R mftall conversions can be obtained by the mud resistivity under normal temperature, therefore viscous crude is handled up Water Flooding Layer mixing formation water resistivity R zcan be tried to achieve by formula 3 and formula 4 simultaneous.
4. the method for quantitatively evaluating of thickened oil steam-stimulated Water Flooding Layer according to claim 1, is characterized in that, in step 2, calculates oil reservoir water saturation S wdesign formulas be:
S w a &times; b &times; R z R t &times; &phi; m n (formula 5)
In formula:
A, b-lithology factor;
M-cementation factor;
N-saturation exponent;
R t-resistivity reservoir, Ω m;
R z-Water Flooding Layer mixing formation water resistivity, Ω m;
Lithology factor a, b and cementation factor m in formula, saturation exponent are only relevant with lithology, and they represent that the distribution situation of profits in hole is on the impact of oil-bearing rock resistivity, is obtained by core hole rock-electric test data.
5. the method for quantitatively evaluating of thickened oil steam-stimulated Water Flooding Layer according to claim 1, is characterized in that, in step 3, the design formulas calculating Water Flooding Layer oil displacement efficiency η is:
&eta; = S w - S wi 1 - S wi (formula 6)
In formula:
η-Water Flooding Layer oil displacement efficiency, %;
S wthe current water saturation of-Water Flooding Layer, f;
S wi-Water Flooding Layer initial irreducible water saturation, f.
6. the method for quantitatively evaluating of thickened oil steam-stimulated Water Flooding Layer according to claim 1, is characterized in that, in step 4, according to the viscous crude determined of Water Flooding Layer oil displacement efficiency η calculated water flooding degree criterion of handling up is:
Non-water logging: η≤5%;
Weak water logging: 5% < η≤20%;
Middle water logging: 20% < η≤40%;
Strong water logging: 40% < η≤60%;
Extra-heavy water logging: η > 60%.
CN201410039138.2A 2014-01-27 2014-01-27 The method for quantitatively evaluating of thickened oil steam-stimulated Water Flooding Layer Active CN104806231B (en)

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CN107589469A (en) * 2017-08-04 2018-01-16 中国石油天然气股份有限公司 The determination method and apparatus of oil-water interfaces
CN109838230A (en) * 2017-11-28 2019-06-04 中国石油天然气股份有限公司 The quantitative evaluation method of oil reservoir Water Flooding Layer
RU2695134C2 (en) * 2017-12-28 2019-07-22 федеральное государственное автономное образовательное учреждение высшего образования "Казанский (Приволжский) федеральный университет" (ФГАОУ ВО КФУ) Method for laboratory determination of oil recovery coefficient using steam injection technologies
CN110017136B (en) * 2019-03-14 2023-01-10 中国石油天然气集团有限公司 Water flooded layer identification and water production rate prediction method based on apparent water layer resistivity
CN110017136A (en) * 2019-03-14 2019-07-16 中国石油天然气集团有限公司 A kind of Water Flooding Layer identification and producing water ratio prediction technique based on view water layer resistivity
CN110905460A (en) * 2019-12-02 2020-03-24 中国石油化工股份有限公司 Viscosity-reducing foaming exploitation method for common heavy oil reservoir
CN111025409A (en) * 2019-12-23 2020-04-17 中国石油大学(北京) Flooded layer evaluation method and device and storage medium
CN111025409B (en) * 2019-12-23 2021-03-02 中国石油大学(北京) Flooded layer evaluation method and device and storage medium
CN112324421A (en) * 2020-06-15 2021-02-05 中国海洋石油集团有限公司 Method for calculating saturation before and after flooding of low-resistivity heavy oil reservoir
CN112324421B (en) * 2020-06-15 2023-06-20 中国海洋石油集团有限公司 Method for calculating saturation of low-resistivity thick oil layer before and after flooding
CN112986091A (en) * 2021-02-02 2021-06-18 东北石油大学 Resistivity test-based oil saturation evaluation method for bedding joint development shale
CN112983411A (en) * 2021-03-09 2021-06-18 中国石油大学(华东) Method for estimating mixed liquor resistivity by using inspection well data
CN113029908A (en) * 2021-03-16 2021-06-25 中国石油大学(华东) Laboratory measurement method for compact reservoir saturation index
CN113029908B (en) * 2021-03-16 2021-11-26 中国石油大学(华东) Laboratory measurement method for compact reservoir saturation index

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