CN103670351B - A kind of steam flooding exploitation method of heavy crude reservoir - Google Patents
A kind of steam flooding exploitation method of heavy crude reservoir Download PDFInfo
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Abstract
The present invention relates to a kind of steam flooding exploitation method of heavy crude reservoir, comprising: while carrying out steam driving exploitation, in reservoir formation, inject the aqueous solution of oil displacement agent; According to the mass fraction, this oil displacement agent contains the sodium salt of the sulfonated phenol formaldehyde resin of 0.001 ~ 20 part and/or calcium salt, the displacement of reservoir oil non-ionic surface active agent of 0.001 ~ 20 part and/or displacement of reservoir oil Nonionic Anionic Surfactants; The number-average molecular weight of described sulfonated phenol formaldehyde resin is 2000 ~ 200000, and in described sulfonated phenol formaldehyde resin, the mass fraction of sulphur is 5% ~ 20%.The method adopts the steam driving exploitation of the assisted and strengthened heavy crude reservoir of oil displacement agent, can improve efficiency of utilization and the recovery ratio of steam driving exploitation, improve steam driving exploitation effect.
Description
Technical field
The present invention relates to a kind of steam flooding exploitation method of heavy crude reservoir.
Background technology
In recent years, along with oil demand constantly soaring and conventional crude output constantly reduce, heavy oil development is just year by year deeply.Thickened oil recovery mode, based on oil recovery by heating, mainly comprises steam soak, steam flooding, combustion in situ.Wherein, steam flooding is by flooding pattern, is continuously injected the Steam Heating oil reservoir of high mass dryness fraction toward oil reservoir, be driven to by viscous crude around producing well and be plucked out of from Injection Well, and its impact scope is large, and recovery ratio is high.And steam flooding is as the Main Means improving recovery ratio after steam soak, heavy industrialization application abroad, recovery ratio rises comparatively obvious.And the feature such as burying of domestic heavy crude reservoir is dark, steam injection pressure is high, mass dryness fraction is low, hydrothermal area is wide, have a strong impact on the oil displacement efficiency of steam flooding, and by rock wettability and the impact with crude oil interfacial characteristics, the effect of simple Thermal Recovery For Viscous Oil By Steam is poor, therefore must carry out relevant art tackling key problem.
At present, the method improving heavy oil exploitation via steam injection efficiency mainly contains nitrogen injection, air injection, note gaseous mixture, chemical injection etc., although the method for gas injection is more effective, but vapour is altered seriously between injection-production well, and there is the explosive potential safety hazard of air-fuel mixture, chemical agent assisted steam flooding then can avoid such problem.
The assisted and strengthened steam flooding of surfactant oil displacement be in steam-drive process using resistant to elevated temperatures surfactant oil displacement as additive with steam injection, livesteam is formed in steam injection pipeline, inject stratum subsequently, fully contact with in-place oil, improve wetability and the interfacial tension of reservoir rock, the glutinous effect of falling of the thermodynamic activity of steam and surfactant is played simultaneously, thus improves steam injection oil displacement efficiency.But due to the connection of thermal field between well can be formed in steam-drive process, steam swept zone temperature range is 100 DEG C ~ 300 DEG C, the thermal field of steam is along steam injection well about 150m radius, central temperature can reach more than 300 DEG C, therefore, oil displacement agent must high temperature resistant and comparatively grow tall temperature time limit inner boundary performance do not change.In addition, raise, when viscous force significantly declines, how to reduce capillary force and become the key affecting exploitation effect at reservoir temperature, therefore reducing remaining oil saturation and namely reduce interfacial tension, is also problem in the urgent need to address in current steam chemical flooding.At present, although the oil displacement efficiency of oil field conventional surfactant is better, still there is the shortcomings such as temperature tolerance difference, formation stability is poor, interface performance is poor, price is high.
Chinese patent CN102277147A provides a kind of flooding method being applicable to high temperature and high salt oil deposit, the method is under displacement of reservoir oil temperature >=65 DEG C and high salinity condition, underground dewatered oil is contacted with displacement composition, by abundant for the crude oil in rock core displacement out, described displacement composition comprises APES carboxylate beet alkali surface activator and high molecular polymer.Although the method solves the problem of the surfactant oil displacement corrosion that oil displacement efficiency is poor under high temperature and high salt condition, working concentration is high and in ternary composite driving, alkali formation and oil well bring and incrustation injury preferably, the method is not also suitable for the high-heat heavy crude oil reservoir of exploitation via steam injection.
WO00/37775 discloses a kind of method adopting the alkylaryl sulfonate surfactants exploitation waxy crude oil of a specific class.This surfactant is that alpha-olefin logistics and the aromatic raw material in wide distribution being 12-58 by average carbon atom number reacts sulfonation afterwards and obtain.This surfactant is to crude oil, and particularly waxy crude oil has high solubilization and can form with it the interface of ultralow interfacial tension, but its temperature tolerance and not mentioned for the effect of viscous crude.
Sulfonated phenol formaldehyde resin is the most frequently used filtrate reducer for drilling fluid.Prior art discloses the synthesis technique of multiple sulfonated phenol formaldehyde resin, as Chinese patent application CN101942069A, CN102241803A etc.Prior art also discloses multiple method of sulfonated phenol formaldehyde resin being carried out to modification, as Yang little Hua disclose a kind of amine modification sulphonation phenolic resins fluid loss additive SCP (oilfield chemistry. the 13rd volume the 3rd phase .259 ~ 260), Li Yao etc. disclose a kind of amphoteric ion type sulfonated phenol formaldehyde resin (western mineral exploration engineering .2010 the 1st phase .43 ~ 46), and CN102241804A discloses a kind of preparation method of coupling phenolic resin used for drilling fluid.Up to now, there are no report sulfonated phenol formaldehyde resin being used for thickened oil recovery field.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of steam flooding exploitation method of heavy crude reservoir, the method adopts the assisted and strengthened steam flooding of oil displacement agent, can improve efficiency of utilization and the recovery ratio of thick oil steam drive, improve steam driving exploitation effect.
A steam flooding exploitation method for heavy crude reservoir, comprising: while carrying out steam driving exploitation, injects the aqueous solution of oil displacement agent in reservoir formation; According to the mass fraction, this oil displacement agent contains the sodium salt of the sulfonated phenol formaldehyde resin of 0.001 ~ 20 part and/or calcium salt, the displacement of reservoir oil non-ionic surface active agent of 0.001 ~ 20 part and/or displacement of reservoir oil Nonionic Anionic Surfactants; The number-average molecular weight of described sulfonated phenol formaldehyde resin is 2000 ~ 200000, and in described sulfonated phenol formaldehyde resin, the mass fraction of sulphur is 5% ~ 20%.
More specifically, said method comprises:
(1) in steam injection well, inject steam continuously, steam injecting temperature is 250 DEG C ~ 300 DEG C, and steam injection speed is 1.5 ~ 2t/ (dham), individual well steam injection speed is 100 ~ 150t/d, production-injection ratio is 1 ~ 1.5, and the steam quality controlling to arrive shaft bottom is greater than 40%, and reservoir pressure controls at 2 ~ 4Mpa;
(2) while step (1) steam injection, be 0.00001 ~ 0.1:1 according to oil displacement agent and quality of steam ratio, in steam injection well, inject the oil displacement agent aqueous solution continuously.
The present invention has no particular limits the concentration of oil displacement agent in its aqueous solution, as long as its aqueous solution can be made to have good mobility.The mass fraction of described oil displacement agent in its aqueous solution is generally 0.01 ~ 80%.
In described sulfonated phenol formaldehyde resin, the mass fraction of sulphur is preferably 7% ~ 14%.
In preferred situation, according to the mass fraction, described oil displacement agent contains the sodium salt of the sulfonated phenol formaldehyde resin of 0.01 ~ 5 part and/or calcium salt, the displacement of reservoir oil non-ionic surface active agent of 0.01 ~ 5 part and/or displacement of reservoir oil Nonionic Anionic Surfactants.
The number-average molecular weight of described sulfonated phenol formaldehyde resin is preferably 2000 ~ 50000.
Phenolic compound and aldehyde compound polycondensation and the resin obtained is referred to as phenolic resins.In the present invention, the polycondensation monomer of sulfonated phenol formaldehyde resin is had no particular limits, but from the ready availability of raw material and cost consideration, phenolic monomers of the present invention preferably has one or more in the phenol of following characteristics: containing one or two phenolic hydroxyl group, one or two phenyl ring and carbon number is 6 ~ 20; Be more preferably one or more in cresols, xylenol, ethyl-phenol, phenylphenol, butylphenol, amyl phenol, bisphenol-A and resorcinol; Aldehyde monomers is preferably one or more in formaldehyde, acetaldehyde, paraformaldehyde and furfural, is more preferably formaldehyde or polycondensation formaldehyde.
Sulfonated phenol formaldehyde resin in the present invention can be buied from market easily, the method preparation that classical documents also can be adopted to record.Sulfonated phenol formaldehyde resin generally can adopt the mode of the following sulfonation limit polycondensation of alkali condition to prepare, and sulfonating agent can adopt sodium pyrosulfite.
Under normal circumstances, the polycondensation monomer of described sulfonated phenol formaldehyde resin is only phenolic monomers and aldehyde monomers two kinds, and does not also carry out modification to sulfonated phenol formaldehyde resin.But the art is known, except phenolic compound and aldehyde compound, the polycondensation monomer of other kind can also be added in polycondensation process; Also can by the mode such as coupling, grafting to phenolic resin modified.Sulfonated phenol formaldehyde resin of the present invention comprises the sulfonated phenol formaldehyde resin that above-mentioned approach obtains, only otherwise violate object of the present invention.
Described displacement of reservoir oil non-ionic surface active agent and displacement of reservoir oil Nonionic Anionic Surfactants comprise any the type surfactant that can be used for oil extraction oil displacement agent.
Described displacement of reservoir oil non-ionic surface active agent can be one or more in alkyl phenol or AEO, sorbitan ester or sucrose fatty ester and alkylolamides.
The oxygen vinyl polymerization degree of described alkyl phenol or AEO is generally between 3 ~ 90, and preferably between 10 ~ 40, total carbon number of alkyl or alkane phenyl is 6 ~ 20, is preferably 8 ~ 16.
Fatty acid alkyl carbon number in described sorbitan ester or sucrose fatty ester is 6 ~ 20, is preferably 8 ~ 18.
Described alkylolamides is one or more in fatty monoethanol amide and fatty diglycollic amide, and the alkyl carbon number of aliphatic acid is 6 ~ 20, is preferably 8 ~ 18.Described alkylolamides is preferably coconut oil fatty acid monoethanolamide and/or cocoanut fatty acid diethanolamide.
Described Nonionic Anionic Surfactants is selected from one or more in the phosphate ester salt of alkyl phenol or AEO, sulfuric acid, carboxylate and sulfonate.General formula is written as respectively:
R-O-（CH
2CH
2O）
n-PO
3M
2
R-O-（CH
2CH
2O）
n-SO
3M
R-O-（CH
2CH
2O）
n-CH
2COOM
R-O-（CH
2CH
2O）
n-R’SO
3M
R is alkyl or alkane phenyl, and total carbon number is 6 ~ 20, preferably 8 ~ 16; N is oxygen vinyl polymerization degree, and its value is 3 ~ 90; M is monovalent metal cation or NH
4 +, the carbon number of R ' is 1 ~ 6 scope.Preferred Nonionic Anionic Surfactants is: C6 ~ C20 alkyl phenol (or fatty alcohol) polyethenoxy ether carboxylate, C6 ~ C20 alkyl phenol (or fatty alcohol) polyethenoxy ether sulphonate, C6 ~ C20 alkyl phenol (or fatty alcohol) polyoxyethylene ether phosphate salt, C6 ~ C20 alkyl phenol (or fatty alcohol) polyoxyethylene ether sulfate.
Main feature of the present invention adopts oil displacement agent to strengthen thick oil steam drive exploitation, improves efficiency of utilization and the recovery ratio of thick oil steam drive, improve steam driving exploitation effect.Sulfonated phenol formaldehyde resin of the present invention is a kind of water-soluble polymer being rich in hydroxyl, sulfonic group and phenyl ring, and it applies for many years as fluid loss additive in drilling fluid, but up to now there are no the report using it for thickened oil recovery field.The present inventor finds that sulfonated phenol formaldehyde resin has and well washes viscous crude ability and heat-resisting quantity, is applicable to 300 DEG C of high temperature of heavy crude heat extraction and cheap; Non-ionic surface active agent has non-ionizing feature in water, and stability is high in the solution, good with other types surfactant compatibility, nonionic-anion surfactant also has good heat-resistant salt-resistant, use composite with sulfonated phenol formaldehyde resin, can improve sulfonated phenol formaldehyde resin and form the compactness of adsorbed film at interface, composite oil displacement agent is at low concentration and when not adding alkali, just can form ultralow interfacial tension and stable performance.
Detailed description of the invention
In order to understand the present invention better, illustrate content of the present invention further below in conjunction with embodiment, but content of the present invention is not only confined to the following examples.
Embodiment 1
For triumph isolated island block oil field, select 4 anti-9 injection-production well groups of 70m well spacing, Boiler Steam outlet temperature is 300 DEG C, steam injection rate is 1.8t/ (dham), well group day steam injection 540t, individual well 120 ~ 150t, inject oil displacement agent (sulfonation phenoxy acetic acid phenol formaldehyde resin than for 0.5:100 by oil displacement agent and quality of steam simultaneously, the mass fraction of polycondensation monomer sulphur is about 10.8%, number-average molecular weight is between 40000 ~ 50000, NPE sulfuric acid, NPES-428, chemicals Technology Co., Ltd. product of section of Foshan City, the two mass ratio is 70:30), production-injection ratio is 1.2, formation pressure controls at below 4MPa, shaft bottom mass dryness fraction is greater than 50%.Whole experimental stage is steam injection 54.1 × 10 altogether
4t, note oil displacement agent 2.7 × 10
3t, oil production 12.4 × 10
4t, stage gas oil ratio 0.23, steam flooding recovery percent of reserves is 25.63%.
Embodiment 2
For triumph block oil field, Dan Jia temple, select 4 anti-9 injection-production well groups of 100m well spacing, Boiler Steam outlet temperature is 280 DEG C, steam injection rate is 1.5t/ (dham), well group day steam injection 460t, individual well 110 ~ 140t, inject oil displacement agent (sulfonated phenol formaldehyde resin than for 0.5:100 by oil displacement agent and quality of steam simultaneously, the mass fraction of sulphur is about 7.3%, number-average molecular weight is between 6000 ~ 8000, polyoxyethylene octadecanol, paregal O-10, Yixing City Jia Jia Chemical Co., Ltd. product, the two mass ratio is 60:40), production-injection ratio is 1.2, formation pressure controls at below 4MPa, shaft bottom mass dryness fraction is greater than 50%.Whole experimental stage is steam injection 38.4 × 10 altogether
4t, note oil displacement agent 1.9 × 10
3t, oil production 9.5 × 10
4t, stage gas oil ratio 0.25, steam flooding recovery percent of reserves is 21.05%.
Comparative example 1
With commercially available nonionic-anion surfactant NPS-10(dodecylphenol polyoxyethylene ether sulfate, Zibo Hai Jie Chemical Co., Ltd. product) replace compound oil displacement agent described in embodiment 1, other dosage used, concentration, steam flooding condition are all identical with embodiment 1, and last oil production is 10.6 × 10
4t, steam flooding recovery percent of reserves is 21.91%.
Comparative example 2
With commercially available non-ionic surface active agent sorbitan fatty acid ester S-20(Zibo Hai Jie Chemical Co., Ltd. product) replace compound oil displacement agent described in example 2, other dosage used, concentration, steam flooding condition are all identical with embodiment 2, and last oil production is 8.7 × 10
4t, steam flooding recovery percent of reserves is 17.98%.
Comparative example 3
With commercially available mahogany acid salt form surfactant PS-1(Dongying City section profit Fine Chemical Works product) replace compound oil displacement agent described in embodiment 2, other dosage used, concentration, steam flooding condition are all identical with embodiment 2, and last oil production is 8.3 × 10
4t, steam flooding recovery percent of reserves is 17.12%.
Claims (15)
1. a steam flooding exploitation method for heavy crude reservoir, comprising: while carrying out steam driving exploitation, injects the aqueous solution of oil displacement agent in reservoir formation; According to the mass fraction, this oil displacement agent contains the sodium salt of the sulfonated phenol formaldehyde resin of 0.001 ~ 20 part and/or calcium salt, the displacement of reservoir oil non-ionic surface active agent of 0.001 ~ 20 part and/or displacement of reservoir oil Nonionic Anionic Surfactants; The number-average molecular weight of described sulfonated phenol formaldehyde resin is 2000 ~ 200000, and in described sulfonated phenol formaldehyde resin, the mass fraction of sulphur is 5% ~ 20%.
2. according to the steam flooding exploitation method of heavy crude reservoir described in claim 1, it is characterized in that, comprising:
(1) in steam injection well, steam is injected continuously, steam injecting temperature is 250 DEG C ~ 300 DEG C, steam injection speed is 1.5 ~ 2t/ (dham), individual well steam injection speed is 100 ~ 150t/d, production-injection ratio is 1 ~ 1.5, the steam quality controlling to arrive shaft bottom is greater than 40%, and reservoir pressure controls at 2 ~ 4Mpa;
(2) while step (1) steam injection, be 0.00001 ~ 0.1:1 according to oil displacement agent and quality of steam ratio, in steam injection well, inject the oil displacement agent aqueous solution continuously.
3. according to the steam flooding exploitation method of heavy crude reservoir described in claim 1, it is characterized in that, in described sulfonated phenol formaldehyde resin, the mass fraction of sulphur is 7% ~ 14%.
4. according to the steam flooding exploitation method of heavy crude reservoir described in claim 1, it is characterized in that, according to the mass fraction, described oil displacement agent contains the sodium salt of the sulfonated phenol formaldehyde resin of 0.01 ~ 5 part and/or calcium salt, the displacement of reservoir oil non-ionic surface active agent of 0.01 ~ 5 part and/or displacement of reservoir oil Nonionic Anionic Surfactants.
5. according to the steam flooding exploitation method of heavy crude reservoir described in claim 1, it is characterized in that, the number-average molecular weight of described sulfonated phenol formaldehyde resin is 2000 ~ 50000.
6. according to the steam flooding exploitation method of heavy crude reservoir described in claim 1, it is characterized in that, in the polycondensation monomer of described sulfonated phenol formaldehyde resin, phenolic monomers is have one or more in the phenol of following characteristics: containing one or two phenolic hydroxyl group, one or two phenyl ring and carbon number is 6 ~ 20.
7. according to the steam flooding exploitation method of heavy crude reservoir described in claim 6, it is characterized in that, in the polycondensation monomer of described sulfonated phenol formaldehyde resin, phenolic monomers is one or more in cresols, xylenol, ethyl-phenol, phenylphenol, butylphenol, amyl phenol, bisphenol-A and resorcinol.
8. according to the steam flooding exploitation method of heavy crude reservoir described in claim 1, it is characterized in that, in the polycondensation monomer of described sulfonated phenol formaldehyde resin, aldehyde monomers is one or more in formaldehyde, acetaldehyde, paraformaldehyde and furfural.
9. according to the steam flooding exploitation method of heavy crude reservoir described in claim 8, it is characterized in that, in the polycondensation monomer of described sulfonated phenol formaldehyde resin, aldehyde monomers is formaldehyde or paraformaldehyde.
10. according to the steam flooding exploitation method of heavy crude reservoir described in claim 1, it is characterized in that, described displacement of reservoir oil non-ionic surface active agent is one or more in alkyl phenol or AEO, sorbitan ester or sucrose fatty ester and alkylolamides.
11. according to the steam flooding exploitation method of heavy crude reservoir described in claim 10, and it is characterized in that, the oxygen vinyl polymerization degree of described alkyl phenol or AEO is between 3 ~ 90, and total carbon number of alkyl or alkane phenyl is 6 ~ 20.
12., according to the steam flooding exploitation method of heavy crude reservoir described in claim 10, is characterized in that, the fatty acid alkyl carbon number in described sorbitan ester or sucrose fatty ester is 6 ~ 20.
13., according to the steam flooding exploitation method of heavy crude reservoir described in claim 10, is characterized in that, described alkylolamides is one or more in fatty monoethanol amide and fatty diglycollic amide, and the alkyl carbon number of aliphatic acid is 6 ~ 20.
14. according to the steam flooding exploitation method of heavy crude reservoir described in claim 13, and it is characterized in that, described alkylolamides is coconut oil fatty acid monoethanolamide and/or cocoanut fatty acid diethanolamide.
15. according to the steam flooding exploitation method of heavy crude reservoir described in claim 1, it is characterized in that, described Nonionic Anionic Surfactants is selected from one or more in the phosphate ester salt of alkyl phenol or AEO, sulfuric acid, carboxylate and sulfonate.
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| CN104265252B (en) * | 2014-08-19 | 2017-07-07 | 中国石油天然气股份有限公司 | A kind of heavy crude reservoir artificial oil stream displacement recovery method |
| CN107298972B (en) * | 2016-04-15 | 2020-03-24 | 中国石油化工股份有限公司 | Oil recovery method |
| CA3094135A1 (en) * | 2018-03-22 | 2019-09-26 | Sasol Performance Chemicals Gmbh | Alkyl alkoxylated carboxylate salts as steam foam additives for heavy oil recovery |
| CN110410047B (en) * | 2019-06-17 | 2021-09-28 | 中国石油天然气股份有限公司 | Oil displacement method for high-gas-content oil field and gas energy release oil displacement agent thereof |
| CN111944506B (en) * | 2020-09-01 | 2023-02-21 | 宁波锋成先进能源材料研究院有限公司 | Pressure-reducing and injection-increasing active agent and preparation method thereof |
| CN112745821A (en) * | 2021-01-06 | 2021-05-04 | 中海石油(中国)有限公司 | Temperature-resistant and salt-resistant oil displacement agent for offshore thick oil steam accompanying injection and application thereof |
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