CN106593373A - Method for improving crude oil recovery efficiency at low cost - Google Patents
Method for improving crude oil recovery efficiency at low cost Download PDFInfo
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- CN106593373A CN106593373A CN201510683232.6A CN201510683232A CN106593373A CN 106593373 A CN106593373 A CN 106593373A CN 201510683232 A CN201510683232 A CN 201510683232A CN 106593373 A CN106593373 A CN 106593373A
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Abstract
The invention relates to a method for improving the crude oil recovery efficiency at low cost. The method mainly solves the problems of high preparation cost, low oil displacement efficiency and poor high-temperature-resistant and high-slat-resistant performance of an oil displacement compound in the prior art. After being adopted, the method for improving the crude oil recovery efficiency at low cost comprises the following steps of mixing an oil displacement agent with water to obtain an oil displacement system; and contacting the oil displacement system with the oil-bearing stratum under the conditions of the oil displacement temperature being 25 to 120 DEG C and the total mineralization degree being greater than 500 mg/L stratum water, so that crude oil in the oil-bearing stratum is displaced out, wherein the oil displacement agent is prepared from the following ingredients including 1 part of a surfactant, 0 (more than 0 parts) to 50 parts of polymers and 0 to 50 parts of alkali. The surfactant is a polyether carboxylate surfactant shown as the formula I. By using the technical scheme, the problem is better solved; and the method can be used in the production of improving the crude oil recovery efficiency in high-temperature and high-salt sandstone oil reservoirs. The formula I is shown as the accompanying drawing.
Description
Technical field
The present invention relates to a kind of method that low cost improves oil recovery factor.
Background technology
Chemical flooding be changed by adding chemical agent in aqueous solution injection fluid physicochemical properties and rheological property and
A kind of enhancements of recovery ratio being improved with the interaction characteristic of reservoir rock, fast development being able in China, which is main
Reason is that China's reservoir is stronger for continental deposit anisotropism, and terrestrial origin of petroleum Crude viscosity is higher, more suitable in EOR methods
Together in chemical flooding.
Surfactant flooding technology is exactly added to surfactant in injection water, is improved by reducing oil water interfacial tension
Washing oil ability improves recovery ratio method come the one kind for improving oil displacement efficiency.Polymer displacement of reservoir oil tech is a kind of important raising oil
The method of recovery ratio, compared with general water drive, polymer displacement of reservoir oil is mainly to increase the viscosity of water phase, controls the stream of oil displacement system
Degree ratio, plays a part of to expand swept volume, and for surfactant, cost is relatively low.The addition of alkali is mainly dropped
Low surfactant adsorption amount, increases the interfacial activity of surfactant.As the important technology in chemical flooding, surface
Bioactivator activity water drive, micellar solution flooding and microemulsion drive the binary complex oil displacing skill that technology, polymeric surfactant are formed
The ASP Oil-Displacing Technology that art and polymeric surfactant alkali are formed has carried out some field tests in China and foreign countries, achieves
Good oil displacement efficiency.Daqing oil field in 2002 has been carried out note activated water increasing injection in Periphery Low Permeability Oilfield and has been tested, and 2003
Year carries out note In Surfactant Solution Flood test in Periphery Low Permeability Oilfield and loudspeaker, Sa, Fructus Pruni oil field Untabulated reservoirs, its objective is to make profit
Interfacial tension is substantially reduced, and reduces the effect on alternate surface, and the oil film that oil clot or stripping are sticked is detained in activation, dispersion, by
The increase of flowing porosity, improves the flowing permeability of oil reservoir, reduces startup pressure, improves floood conformance volume and drive
The effect of oily efficiency.It was verified that active water drive can increase substantially the oil recovery factor for having put into development block, and
The reserves that a part can not be employed under the conditions of current economic technology are made effectively to put into exploitation.To 1994 since, Daqing oil
5 ternary composite driving tests have been carried out using the heavy alkylbenzene sulfonate of external import in field, are carried on the basis of waterflood recovery efficiency factor again
High oil recovery factor 20%, and ternary composite driving is specify that according to this for the tertiary oil recovery dominant technology after polymer flooding.Oil field
After ternary composite driving guide's field test is successful, it is contemplated that the difficult problem of fouling and breakdown of emulsion, binary combination flooding is taken
Technology path, using petroleum sulfonate surfactant with Shengli crude as Material synthesis as host, non-ionic surface is lived
Property is adjuvant, can be issued to ultralow interfacial tension in alkali-free condition, and carry out ore deposit in seven area southwest of Gu Dong in 2003
Pilot test, improve recovery ratio can 12%, solve fouling and breakdown of emulsion hardly possible problem.
For polymer displacement of reservoir oil tech, surfactant is used as the performance that the key that oil displacement agent is used is surfactant
And cost, particularly preparation cost directly constrain its application in terms of agent for improving oilfield recovery.Mobil Oil Corporation it is special
Sharp US3927716, US4018281, US4216097 are reported in succession using caustic flooding, surfactant or aqueous alkali
The displacement of reservoir oil and the result using the zwitterionic surfactant displacement of reservoir oil, carboxylic of the zwitterionic surfactant for adopting for different chain length
Acid or sulfonate type beet alkali surface activator, in total 62000～160000mg/L of mineralising, 1500～18000mg/L of calcium ions and magnesium ions
Simulation saline in, to the interfacial tension of Texas Southern crude oil up to 10-1～10-4mN/m.The patent of Mobil Oil Corporation
US4370243 reports the oil displacement system constituted using oil-soluble alcohol, sulphonic acid betaine and quaternary ammonium salt, and the system can both rise
To the effect of surfactant, it is also possible to play a part of mobility control agent, wherein quaternary ammonium salt is lipophilic group carbochain a length of 16～20
Cationic surfactant, using 2wt% octadecyl dihydroxy ethyl propyl sulfonic acid betaine salt and 1.0% hexanol
Used as oil displacement agent, after injection 1.9PV, by crude oil, 100% displaces, but surfactant adsorption is lost larger reaching
6mg/g, adds 2.0% tetraethylammonium bromide of relative low price as sacrifice agent reducing surfactant on this basis
Adsorbance.Patent US8211837 of Texas ,Usa university application, it was recently reported that using the linear alcohol of cheap and simple in height
The lower catalytic dimerization reaction of temperature obtains the long carbon alcohol being branched, with expoxy propane, ethylene oxide polymerization after carry out sulfuric acid esterification,
Relative to expensive sulfonate surfactant, low cost has synthesized big hydrophilic group polyethers sulfate surfactant, due to
The presence of big hydrophilic group so that the sulfate surfactant high temperature stability performance is excellent in the basic conditions, 0.3%
Branched-chain alcoho polyethers sulfate (C32- 7PO-6EO sulfate) with 0.3% internal olefin sulphonates (C20～24IOS) saline
Solution is mixed with same amount of crude oil at 85 DEG C, and its solubilization parameter is 14.Foreign study using surfactant due to making
Consumption is big, high cost, receives certain restriction in actual applications as oil displacement agent.
Polyether carboxylation is an analog anion surfactants, is often changed by carboxy methylation by nonionic surfactant
Property and come, have the feature of nonionic and anion surfactant concurrently, with surface tension is low, small toxicity, easily biological
The features such as degraded, be a class multi-functional " green surfactant ".Due to its special property, Fatty Alcohol Ether Carboxylate exists
Cosmetics, detergent, biochemistry, pharmacy, food processing, crude oil demulsification, viscous crude drop be glutinous etc., and field has widely should
With.United States Patent (USP) US4818440 reports the preparation and application of fatty amide polyoxyethylene ether acetic acid, and wherein carboxy methylation is anti-
Addition sodium hydroxide and sodium chloroacetate solid in batches should be used, final polyethers conversion ratio reaches 75～80%, synthesis
The acidified purification of crude product obtains the higher fatty amide polyoxyethylene ether acetic acid of purity, is applied to shampoo as main component
Deng in daily chemical products.In this report, polyether carboxylation need to be complicated through purification, synthesis technique, and the three wastes of generation are more, prepare
It is relatively costly, and the application being not directed in terms of oil recovery factor is improved.
The use of Heat Resistant and Salt Tolerant Polymer is another key factor for improving oil recovery factor.Early stage is usually used in enhanced oil recovery
(EOR) industrial products of polymer flooding only have partially hydrolyzed polyacrylamide (PHPA) (HPAM), and it depends on high molecular
Repulsive interaction with the ion on polymer molecular chain and highly polar side base reaches adhesion-promoting effect.But, heavy polymer
When by larger stretching and shear stress, it is easy to mechanical degradation occurs and viscosity is lost, inject in low-permeability rock stratum
It is particularly evident during polymer.Cation in aqueous solution, especially divalent ion, the ionic group in meeting shielded polymer,
Crimp polymer molecular chain, hydrodynamic volume reduces even precipitation, so that adhesion-promoting is substantially reduced.When stratum oil reservoir
When temperature is higher (93 DEG C of ＞), the facile hydrolysiss in high temperature aqueous solution of the amide groups in polyacrylamide (PAM) make polymer
The salt-resistance of solution drastically declines.In recent years, about temperature-resistant and anti-salt type polyacrylamide research mainly by polymerization owner
Big side base is introduced on chain or rigid side base improves the heat stability of polymer, introduces the monomer or insensitive to salt for suppressing hydrolysis
Monomer carries out copolymerization to improve the hydrolysis and anti-salt property of polymer, or by the heat resistance and salt tolerance of hydrophobic group improving
The temperature-resistant anti-salt performance of polymer.
The above results show that it is to improve the key of oil recovery factor that low cost prepares displacement composition.Made using " one kettle way "
The standby method containing polyether carboxylic acid's salt surfactant, can greatly reduce the life of displacement composition key component surfactant
Cost is produced, the green production of surfactant is realized.The aqueous solution of the surfactant for preparing simultaneously, or surface activity
Agent and the aqueous solution of polymer, or the aqueous solution displacement composition containing surfactant and polymer and alkali is for reduction crude oil
Interfacial tension, emulsified crude oil and expansion swept volume have preferable effect so that such displacement composition is improved in oil field and adopted
There is in terms of yield larger application prospect.Therefore, for high temperature and high salt sandstone oil reservoir the characteristics of, one kind has been invented on stratum
At a temperature of long-time Stability Analysis of Structures, and can with crude oil formed 10-2～10-4MN/m low interfacial tensions, effectively improve oil recovering
The oil displacement agent of rate.Exactly this displacement composition of the present invention, preparation method and its answering in oil recovery factor is improved
With.
The content of the invention
The technical problem to be solved is that displacement composition oil displacement efficiency is low, preparation cost is high, anti-height in prior art
The problem of gentle high salt poor performance, there is provided a kind of method that new low cost improves oil recovery factor.The method will contain surface work
Property agent aqueous solution, or the aqueous solution of surfactant, polymer and alkaline matter as displacement composition be used for the displacement of reservoir oil
Cheng Zhong, have the advantages that heat resistance it is good, under the high temperature conditions oil displacement efficiency it is high.
In order to solve above-mentioned technical problem, the technical solution used in the present invention is as follows：A kind of low cost improves oil recovery factor
Method, comprises the following steps：
(1) oil displacement agent and water are mixed to get into oil displacement system；
(2) by the oil displacement system in 25～120 DEG C of displacement of reservoir oil temperature, total salinity>Under 500 mg/litre stratum water conditions with
Oil bearing bed is contacted, by the mother oil displacement in the oil bearing bed out；
Wherein, described oil displacement agent, in terms of mass fraction, including following components：
1) 1 part of surfactant；
2) 0～50 part of polymer；
3) 0～50 part of alkali；
It is 0 when the polymer is different with the amount of alkali；The surfactant is anion-nonionic surfactant and salt and alcohol
Mixture；The polymer is the polymer suitable for oil extraction in oil field；The alkali is inorganic base or at least one in organic amine；
In the oil displacement system, in terms of total oil displacement system quality, the concentration containing the surfactant is 0.001～2.0wt%, is contained
The concentration of the polymer is 0～1.8wt%, and the concentration containing the alkali is 0～2.0wt%.
In above-mentioned technical proposal, the surfactant is polyether carboxylic acid's salt surfactant shown in Formulas I, alcohol and salt to rub
You are than being 1：(1～10)：The mixture that (1～10) is formed；
R1X(CH2CH2O)m1(CH3CHCH2O)n(CH2CH2O)m2R2COOM, Formulas I；
X is O, R1For C8～C30Aliphatic group or by C4～C20The saturation and unsaturated alkyl of straight or branched takes
The phenyl ring or naphthalene nucleus in generation；Or R1X is abietate；M1=0～50, m2=0～50, n=0～100, R2For C1～C5
Alkylidene or hydroxyl substituted alkylene；M is selected from hydrogen, alkali metal or by formula NR4(R5)(R6)(R7) shown in group extremely
Few one kind；R4、R5、R6、R7To be independently selected from H, (CH2)aOH or (CH2)b CH3In one kind, a=2～4,
Any integer in b=0～5；At least one of the salt in metal halide, acylate；The alcohol is selected from C1～C6
Short carbon chain alcohol.
In above-mentioned technical proposal, R1Preferably C12～C24Alkyl or by C8～C12Alkyl-substituted phenyl or R1X is preferred
For abietate, R2For C1～C3Alkylidene or hydroxyl substituted alkylene.
In above-mentioned technical proposal, preferred m1=0～30, m2=0～30, n=0～30, and m1+m2 when different from n is
Zero, a=2, b=0 or 1.
In above-mentioned technical proposal, the metal halide preferably is selected from alkali halide, and the acylate preferably is selected from hydroxyl and takes
The carboxylate in generation.
The key active ingredient of salt surfactant containing polyether carboxylic acid of the invention is polyether carboxylation I, can be by the polyether carboxylic acid
Salt surfactant and the salt and alcohol are obtained by mixing in required ratio, are preferably obtained with following preparation methoies.
In above-mentioned technical proposal, the polymer is not strictly limited, and can be various use well-known to those skilled in the art
In the polymer of oil extraction in oil field, for example but not limit selected from xanthan gum, hydroxymethyl cellulose, hydroxyethyl cellulose, anion
At least one in type polyacrylamide, modified polyacrylamide, hydrophobic associated polymer, polymer microballoon.
In above-mentioned technical proposal, the hydrophobic associated polymer is preferably common by acrylamide, temperature-resistant anti-salt monomer or hydrophobic monomer
It is poly- to form；The modified polyacrylamide is preferably formed by acrylamide, temperature-resistant anti-salt monomer copolymerization；Temperature-resistant anti-salt monomer or
Hydrophobic monomer can be the monomer containing big side base or rigid side base well-known to those skilled in the art (as styrene sulfonic acid,
N- alkyl maleimides, acrylamido chain alkyl sulfonic acid, chain alkyl allyl dimethyl base ammonium halide, 3- acryloyls
Amido -3 Methylbutanoic acid etc.), the monomer containing resistance to salt groups (such as 2- acrylamide-2-methylpro panesulfonic acids), containing hydrolysis
The monomer (such as N- alkyl acrylamides) of group, the monomer containing the group that can suppress amide groups hydrolysis are (such as N- ethylene pyrroles
Alkanone), at least one in the monomer containing hydrophobic group etc., temperature-resistant anti-salt monomer is preferably 2- acrylamido -2- methyl-props
Sulfonic acid, hydrophobic monomer are preferably 2- acrylamido dodecyl sodium sulfonates.
In above-mentioned technical proposal, in described hydrophobic associated polymer, acrylamide and temperature-resistant anti-salt monomer and hydrophobic monomer rubs
You are than being 1：(0.1～40)：(0.001～0.05), viscosity-average molecular weight are 500～25,000,000；More preferably acrylamide
Mol ratio with temperature-resistant anti-salt monomer and hydrophobic monomer is 1: (0.1～20): (0.001～0.01), viscosity-average molecular weight is
1200～22,000,000.
In above-mentioned technical proposal, in the modified polyacrylamide acrylamide and temperature-resistant anti-salt monomer mole preferably than for
(0.1～40): 1.
In above-mentioned technical proposal, the preferred acrylamide of described hydrophobic associated polymer, 2- acrylamide-2-methylpro panesulfonic acids
Form with 2- acrylamido dodecyl sodium sulfonate copolymerization, acrylamide, 2- acrylamide-2-methylpro panesulfonic acids and 2- propylene
Amide groups dodecyl sodium sulfonate mol ratio is preferably 1：(0.1～40)：(0.001～0.05), more preferably 1: (0.1～20):
(0.001～0.01).
In above-mentioned technical proposal, the modified polyacrylamide is preferably by acrylamide, 2- acrylamide-2-methylpro panesulfonic acids
Copolymerization is formed, and acrylamide is preferably (0.1～40) with 2- acrylamide-2-methylpro panesulfonic acids mol ratio: 1, it is modified poly-
The viscosity-average molecular weight of acrylamide is preferably 800～25,000,000.
In above-mentioned technical proposal, the inorganic base substance preferred alkali metal hydroxide, alkaline earth metal hydroxide, alkali gold
At least one in category carbonate；Further preferably alkali metal hydroxide is selected from least in sodium hydroxide, potassium hydroxide
Kind, at least one of the alkaline earth metal hydroxide in magnesium hydroxide, calcium hydroxide, alkali carbonate are selected from sodium carbonate
Or at least one in sodium bicarbonate.
In above-mentioned technical proposal, in the preferred molecule of the organic basic material, contain primary amine groups, secondary amine, tertiary amine groups, quaternary ammonium
At least one at least one in base, more preferably ethanolamine, diethanolamine, triethanolamine or triethylamine.
In above-mentioned technical proposal, in the displacement composition, mass ratio of the surfactant with polymer with alkaline matter is preferably
1: (0～2)：(0～5).
In above-mentioned technical proposal, the preparation method of the displacement composition, one of preferred version are comprised the following steps：
(1) in the presence of base catalyst, R1XH successively with aequum oxirane, expoxy propane, reacting ethylene oxide
Obtain R1X(CH2CH2O)m1(CH3CHCH2O)n(CH2CH2O)m2H；
(2) by R1X(CH2CH2O)m1(CH3CHCH2O)n(CH2CH2O)m2H and YR2COOR3And alkali metal hydrogen-oxygen
Compound or alkali metal alcoholates are with mol ratio 1:(1～5):(1～10) mix, in 50～120 DEG C of reaction temperature under stirring, instead
Answer 3～15 hours, obtain polyether carboxylate intermediate
R1X(CH2CH2O)m1(CH3CHCH2O)n(CH2CH2O)m2R2COOR3, add water or alcohol water to carry out saponification without the need for separating
Reaction, the surfactant mixture containing polyether carboxylation after flowing back 1～10 hour, needed for obtaining；
(3) based on the mass fraction, the surfactant mixture that step (2) is obtained is mixed homogeneously with polymer, alkali,
Obtain described displacement composition.
Wherein, R3Selected from C1～C8Alkyl；Y is selected from chlorine, bromine or iodine；Base catalyst be alkali metal hydroxide or
At least one in carbonate, alkaline earth metal hydroxide or carbonate；Alcohol in alcohol-water solution is C1～C6Short carbon chain alcohol.
The preparation method reaction equation containing polyether carboxylic acid's salt surfactant is as follows：
In above-mentioned technical proposal, in step (1), reaction temperature is preferably 120～160 DEG C, and pressure is preferably 0.30～0.60MPa
Gauge pressure, at least one in base catalyst preferably potassium hydroxide or Anhydrous potassium carbonate.
In above-mentioned technical proposal, preferred Y is chlorine or bromine.
In above-mentioned technical proposal, R3Preferably C1～C4Alkyl.
In above-mentioned technical proposal, in step (2), alkali metal hydroxide is preferably at least in potassium hydroxide or sodium hydroxide
Kind, R1X(CH2CH2O)m1(CH3CHCH2O)n(CH2CH2O)m2H and YR2COOR3And alkali metal hydroxide or
The mol ratio of alkali metal alcoholates is preferably 1:(1～3):(2～6), short carbon chain alcohol is preferably C1～C5Short carbon chain alcohol.
In order to obtain salt surfactant containing polyether carboxylic acid when M is by formula NR4(R5)(R6)(R7) shown in group when product,
On the basis of step (2), acid can be added to adjust to pH=1-2, then with required NR4(R5)(R6)(R7) neutralization.
In above-mentioned technical proposal, formula NR4(R5)(R6)(R7) shown in the corresponding alkali of group preferably be selected from ammonia, ethanolamine, diethyl
Hydramine, triethanolamine, triethylamine etc..
YR2COOR3Example have but be not limited to chloracetate (such as ethyl chloroacetate), bromacetate (such as bromoacetic acid
Ethyl ester) etc..
In above-mentioned technical proposal, the modified polyacrylamide is by two kinds of acrylamide, 2- acrylamide-2-methylpro panesulfonic acids
Monomer is formed using water solution polymerization process, can be buied from market, it is also possible to which free-radical polymerized by routine is obtained.No matter
Block copolymerization or random copolymerization, the product for obtaining are used equally to the present invention and reach the purpose of the present invention.The embodiment of the present invention
In modified polyacrylamide, be according to mol ratio by acrylamide and two kinds of monomers of 2- acrylamide-2-methylpro panesulfonic acids
(0.1～40): is obtained with water as solvent conventional radical initiators cause Raolical polymerizable after 1 mixing.
In above-mentioned technical proposal, the hydrophobic associated polymer is by acrylamide, 2- acrylamide-2-methylpro panesulfonic acids and 2-
Three kinds of monomers of acrylamido dodecyl sodium sulfonate are formed using water solution polymerization process, can be buied from market, it is also possible to pass through
Conventional is free-radical polymerized prepared.No matter block copolymerization or random copolymerization, the product for obtaining are used equally to the present invention and reach
The purpose of the present invention.Hydrophobic associated polymer in the embodiment of the present invention, is by acrylamide, 2- acrylamido -2- methyl
Propane sulfonic acid is with three kinds of monomers of 2- acrylamidos dodecyl sodium sulfonate according to mol ratio 1：(0.1～20)：(0.001～0.01)
Obtained with water as solvent conventional radical initiators cause Raolical polymerizable after mixing.
The key active ingredient of displacement composition of the present invention be the component 1), 2) He 3), one skilled in the art will appreciate that
For the ease of transport and store or onsite application etc. from the aspect of, various supply forms, such as water-free solid-state can be adopted
Form, or aqueous solid-state form, or aqueous cream form, or aqueous solution form；Aqueous solution form includes using
Water is made into the form of concentrated solution, is directly made into the oil displacement agent form of live displacement of reservoir oil desired concn；Wherein, there is no special wanting to water
Ask, can be deionized water, can also be the water containing inorganic mineral, and the water for containing inorganic mineral can be tap water,
Oil field stratum water or oilfield injection water.
Displacement composition of the present invention can also contain foam commonly used in the art, small organic molecule (such as isopropanol, second
Glycol monobutyl ether, DMSO etc.) etc. oil recovery auxiliary agent.
In above-mentioned technical proposal, the displacement composition can be mixed according to aequum each component using various conventional mixing methods
Obtain, for obtaining oil displacement agent for the displacement of reservoir oil according to desired concn water dissolution during the displacement of reservoir oil；Can be with according to required oil displacement agent
Concentration, each component in the displacement composition is dissolved in water and obtains oil displacement agent for the displacement of reservoir oil.Water used in preparation
Can be tap water, river, sea water, oil field stratum water；Preferred water is：Simulation oil field stratum water, total salinity are preferred
For 10000～250000 mg/litres.
The present invention carries out effect assessment using physical modeling's displacement evaluation methodology, and concrete evaluation methodology is：
By rock core constant temperature drying to constant weight, the perm-plug method of rock core is determined；With above-mentioned simulation oil field stratum water saturation rock core,
Its pore volume is calculated, at a temperature of the displacement of reservoir oil, with crude oil saturated core, the volume of saturation crude oil is recorded, then with 0.1ml/min
Speed pump into stratum water, be driven to aqueous up to 100%, calculate the recovery ratio that water drive improves crude oil, then with 0.1ml/min
The oil displacement agent that obtains of speed 0.1～1PV of tuberculosiss (rock pore volume) step (3), with the speed water drive of 0.1ml/min to aqueous
100%, calculate the percent that oil recovery factor is improved on the basis of water drive.
The preparation method containing polyether carboxylic acid's salt surfactant that the present invention is adopted, due to obtaining high-purity anionic carboxylate table
Face activating agent is often relatively difficult, need to repeatedly be acidified purification, causes the generation of a large amount of three wastes, short using what is generated reaction
Method of the chain carbon alcohol as cosolvent, can both improve dissolubility of the surfactant in water, can save separation short chain again
The step of carbon alcohol, the by-product salt of generation and may be excessive alkali Surfactant interface performance have facilitation also without
Need to separate, so as to the production cost of surfactant is greatly reduced on the basis of surfactant properties are ensured, realize
The green production of surfactant.Polyether carboxylic acid's salt surfactant of preparation, due to contain simultaneously polyethers and carboxylate radical it is cloudy from
Subbase group, the temperature resistance salt resistant character excellent so as to impart the surfactant, polyether carboxylic acid's salt surfactant has relatively low
Critical micelle concentration (cmc), less than 1～2 order of magnitude of conventional anion surfactant, so that the surface activity
The concentration window of agent is wider, it is possible to resolve caused because surfactant concentration progressively declines during Oil Field use
Interfacial tension rises problem so that surfactant is in the migration process of down-hole, even if concentration is relatively low can still to keep ultralow oil
Water interfacial tension such that it is able to improve oil displacement efficiency.Modified polyacrylamide or hydrophobic association polyacrylamide in compositionss,
Due to the introducing of temperature-resistant anti-salt fragment, give polymer preferable temperature-resistant anti-salt performance.Alkali in compositionss can with crude oil in
Surfactant forms soap, further improves the interfacial activity of oil displacement system, reduces absorption of the surfactant on stratum, right
Improve oil recovery factor and there is preferably effect.
The group that anion surfactant in the present invention contains polyethers is made up of EO-PO-EO segmented structure, the present inventor
Have surprisingly found that, other structures are identical and identical EO numbers and PO numbers under conditions of, obtained using this kind of arrangement mode
The oil displacement efficiency of compositionss is much better than EO-PO arrangements or PO-EO arrangements.
The method that the oil displacement agent and low cost that the present invention is adopted improves oil recovery factor, for 50～100 DEG C of formation temperature, mineralising
Degree 10000～250000 mg/litres simulation oil field stratum water and crude oil, by percentage to the quality, consumption be 0.005～
0.6wt% surfactants and 0～0.3wt% above-mentioned hydrophobic associated polymer and 0～1.2wt% above-mentioned alkali forms oil displacement agent,
The apparent viscosity of the oil displacement agent composition solution is determined, it is reachable with the dynamical interfacial tension value between the dewatered oil of oil field
10-2～10-4MN/m, Jing physical modeling's displacement experiment Lab-evaluation, the oil displacement agent can improve oil recovering on the basis of water drive
Rate achieves preferable technique effect up to 19.89%.
Description of the drawings
Fig. 1 is simulation core displacement experiment flow chart.Wherein, 1 is constant-flux pump, and 2 is six-way valve, and 3 is intermediate receptacle, 4
For pharmacy jar, 5 is compression pump, and 6 is six-way valve, and 7 is fill out sand tube, and 8 is graduated cylinder.
Below by embodiment, the present invention is further elaborated.
Specific embodiment
【Embodiment 1】
(1) the polyether carboxylation's surfactant structure formula for preparing is as follows：
242 grams of (1 mole) hexadecanol, 8.6 grams of potassium hydroxide are added in the 2L pressure reactors equipped with agitating device,
When being heated to 80～90 DEG C, vacuum system is opened, be dehydrated under a high vacuum 1 hour, then with nitrogen displacement 3～4 times,
System reaction temperature is adjusted to into 140 DEG C and is slowly passed through 132.0 grams of (3 moles) oxirane, 469.8 are slowly passed through then at 150 DEG C
Temperature after propylene oxide reaction terminates is adjusted to 140 DEG C and is delayed by gram (8.1 moles) expoxy propane, control pressure≤0.60MPa again
It is slow to be passed through 178.2 grams of (4.05 moles) oxirane, control pressure≤0.40MPa.After reaction terminates, 90 DEG C are cooled to, very
Empty to remove low-boiling-point substance, after cooling, neutralization, dehydration, obtain hexadecanol Polyethylene oxide (3) polyoxypropylene (8) Polyethylene oxide (4)
998.8 grams of ether, yield 98.5%.
(1.1 rub for 507 grams of hexadecanol Polyethylene oxide (3) polyoxypropylene (8) Polyethylene oxide (4) ether (0.5 mole) and 61.6 grams
You) potassium hydroxide added in be furnished with mechanical agitation, thermometer and reflux condensing tube 2500 milliliters of reaction bulb, and stirring is lower slow
Slowly 91.9 grams of (0.55 mole) bromoacetates are instilled, and 80 DEG C of controlling reaction temperature is reacted 5 hours, 500 grams is added after cooling
Water and 50 gram of 95% ethanol, continue to be heated to back flow reaction 4 hours.Room temperature is cooled to, the surfactant needed for obtaining
S01, by percentage to the quality, hexadecanol Polyethylene oxide (3) polyoxypropylene (8) Polyethylene oxide (4) ether acetic acid potassium 46.02%,
Potassium bromide 4.94%, glycolic potassium 0.47%, ethanol 6.04%, water 42.51%.
(2) the oil field simulated formation water of different bivalent cations and total salinity is prepared respectively, and concrete composition is shown in Table 1.No
It is shown in Table 2 with the dewatered oil viscosity in oil field.
S01 surfactants, hydrophobic associated polymer prepared by preparation steps (1) is distinguished with Shengli Oil Field simulated formation water A
(viscosity-average molecular weight 1930 is ten thousand) for P1, copolymerization AM/AMPS/2- acrylamidos dodecyl sodium sulfonate mol ratio=1/0.5/0.001
With the aqueous solution of sodium carbonate, stir 3 hours, then three be mixed to get into a kind of uniform poly- table alkali ternary system oil displacement agent,
Viscosity and oil water interfacial tension of the measure system at 87 DEG C, and compared with S01, P1 and S01+P1 system, it is shown in Table 3
It is shown.The S01 aqueous solutions of variable concentrations are prepared respectively with simulated formation water, its oil-water interfaces to oil field dewatered oil is determined
Tension force, is shown in Table 4.Apparent viscosity is determined by the BROODFIELD type IIIs viscosimeter of Brookfield companies of the U.S.,
Interfacial tension is determined by the TX500 types rotating interfacial tensimeter that Texas ,Usa university produces.
(3) average diameter and rock core length of rock core by artificial core constant temperature drying to constant weight, are measured, rock core dry weight is weighed, is surveyed
Determine the perm-plug method of rock core.With above-mentioned stratum water saturation rock core, its pore volume is tested.It is full with Shengli Oil Field dewatered oil
And rock core, record the volume of saturation crude oil.At a temperature of 87 DEG C, Produced Liquid is driven to Shengli Oil Field simulated formation water A and is contained
Water calculates the recovery ratio that water drive improves crude oil, the poly- table alkali that tuberculosiss 0.3PV (rock pore volume) step (2) synthesizes up to 100%
After ternary system oil displacement agent, water drive to aqueous 100% calculates the percent that oil recovery factor is improved on the basis of water drive, together
When PV identical with note single or binary displacement oil agent compare, be shown in Table 3.Rock core perm-plug method HKGP-3 types
Compact rock core gas permeability porosity measuring instrument is determined, and the simulation core displacement experiment flow process of employing is as shown in Figure 1.
【Embodiment 2】
(1) the polyether carboxylation's surfactant structure formula for preparing is as follows：
To equipped with agitating device 2L pressure reactors in add 220 grams of (1 mole) nonyl phenols, 1.5 grams of potassium hydroxide and
4.6 grams of Anhydrous potassium carbonates, together【Embodiment 1】Eliminating water and nitrogen displacement are carried out, system reaction temperature is adjusted to into 140 DEG C slowly
88.0 grams of (2.0 moles) oxirane are passed through, 585.8 grams of (10.1 moles) expoxy propane are slowly passed through then at 150 DEG C, controlled
Temperature after propylene oxide reaction terminates is adjusted to 140 DEG C and is slowly passed through 134.2 grams (3.05 moles) by pressure≤0.60MPa again
Oxirane, control pressure≤0.40MPa.After reaction terminates, together【Embodiment 1】Post processing, obtains Nonyl pheno
(2) 991.4 grams of polyoxypropylene (10) Polyethylene oxide (3) ether, yield 97.2%.
510 grams of Nonyl pheno (2) polyoxypropylene (10) Polyethylene oxide (3) ether (0.5 mole) and 60.0 gram (1.5
Mole) sodium hydroxide added in be furnished with mechanical agitation, thermometer and reflux condensing tube 2500 milliliters of reaction bulb, under stirring
102.4 grams of (0.75 mole) isopropyl chloracetates are slowly dropped into, 100 DEG C of controlling reaction temperature is reacted 3 hours, added after cooling
500 grams of water and 70 grams of isopropanols, continue to be heated to back flow reaction 3 hours.Room temperature is cooled to, the surface activity needed for obtaining
Agent S02, by percentage to the quality, Nonyl pheno (2) polyoxypropylene (10) Polyethylene oxide (3) ether acetic acid sodium
46.21%, Sodium Chloride 2.43%, glycolic sodium 2.31%, isopropanol 8.03%, water 41.02%.
(2) S02, hydrophobic associated polymer (P1, copolymerization prepared by preparation steps (1) is distinguished with Shengli Oil Field simulated formation water A
Ten thousand) and carbonic acid AM/AMPS/2- acrylamidos dodecyl sodium sulfonate mol ratio=1/0.5/0.001, viscosity-average molecular weight 1930
Sodium water solution, stirs 4 hours, and remaining is same【Embodiment 1】(2), the results are shown in Table shown in 5.With oil field simulated formation moisture
Not Pei Zhi variable concentrations S02 aqueous solutions, determine its oil water interfacial tension, be shown in Table 4.
(3) it is same【Embodiment 1】(3) laboratory simulation flooding test is carried out, is the results are shown in Table shown in 5.
【Embodiment 3】
(1) the polyether carboxylation's surfactant structure formula for preparing is as follows：
R1O(CH2CH2O)5(CHCH3CH2O)4(CH2CH2O)20CH2COONa
Wherein, R1Carbochain be distributed as：C1272.3%th, C1427.7%.
195.0 grams of (1 mole) 12/14 (C of mixing are added in the 2.5L pressure reactors equipped with agitating device12～14)
Alcohol, 14.5 grams of Anhydrous potassium carbonates, together【Embodiment 1】Eliminating water and nitrogen displacement are carried out, system reaction temperature is adjusted to into 140 DEG C
222.2 grams of (5.05 moles) oxirane are slowly passed through, 234.9 grams of (4.05 moles) expoxy propane are slowly passed through then at 150 DEG C,
Control pressure≤0.50MPa, after propylene oxide reaction terminates, cooling is slowly passed through 924 grams of (21 moles) rings in 130 DEG C
Oxidative ethane, control pressure≤0.40MPa.After reaction terminates, together【Embodiment 1】Post processing, must mix 12/14 (C12～14)
1513.3 grams of alcohol Polyethylene oxide (5) polyoxypropylene (4) Polyethylene oxide (20) ether, yield 99.1%.
Mix 12/14 (C12～14) 763.5 gram (0.5 of alcohol Polyethylene oxide (5) polyoxypropylene (4) Polyethylene oxide (20) ether
Mole) and 60.0 grams of (1.5 moles) sodium hydroxide add and be furnished with 2500 milliliters of mechanical agitation, thermometer and reflux condensing tube
Reaction bulb in, be slowly dropped into 79.6 grams of (0.65 mole) ethyl chloroacetates under stirring, 90 DEG C of reactions 4 of controlling reaction temperature are little
When, 700 grams of water and 200 gram of 95% ethanol are added after cooling, continues to be heated to back flow reaction 5 hours.It is cooled to room temperature,
Surfactant S03 needed for obtaining, by percentage to the quality, mixes 12/14 (C12～14) alcohol Polyethylene oxide (5)
Polyoxypropylene (4) Polyethylene oxide (20) ether acetic acid sodium 44.53%, Sodium Chloride 1.65%, glycolic sodium 0.81%, hydrogen-oxygen
Change 0.43% ethanol 12.35% of sodium, water 40.23%.
(2) S03 for being prepared with Zhongyuan Oil Field simulated formation water C preparation steps (1) and hydrophobic associated polymer (P2, copolymerization
AM/AMPS/2- acrylamidos dodecyl sodium sulfonate mol ratio=1/0.5/0.002, the ten thousand) aqueous solution of viscosity-average molecular weight 1800,
Stirring 4 hours, temperature of the measurement are 90 DEG C, and remaining is same【Embodiment 1】(1), the results are shown in Table shown in 6.With oil field simulation ground
Layer water prepares the S03 aqueous solutions of variable concentrations respectively, determines its interfacial tension to oil field dewatered oil, is shown in Table 4.
(3) it is same【Embodiment 1】(3) laboratory simulation flooding test is carried out, it is 90 DEG C that difference is displacement of reservoir oil temperature, as a result
It is shown in Table 6.
【Embodiment 4】
(1) the polyether carboxylation's surfactant structure formula for preparing is as follows：
158 grams of (1 mole) decanol, 7.2 grams of potassium hydroxide are added in the 2.5L pressure reactors equipped with agitating device,
Together【Embodiment 1】Eliminating water and nitrogen displacement are carried out, system reaction temperature is adjusted to into 150 DEG C and is slowly passed through 1287.6 gram (22.2
Mole) expoxy propane, control pressure≤0.50MPa, after propylene oxide reaction terminates, cooling, together【Embodiment 1】After locate
Reason, obtains 1365.2 grams of decanol polyoxypropylene (22) ether, yield 95.2%.
717 grams of decanol polyoxypropylene (22) ether (0.5 mole) and 61.6 grams of (1.1 moles) potassium hydroxide additions are furnished with machinery and stir
Mix, in 2500 milliliters of thermometer and reflux condensing tube of reaction bulb, under stirring, be slowly dropped into 91.9 grams of (0.55 mole) bromines
Ethyl acetate, together【Embodiment 1】Reaction, the surfactant S04 needed for obtaining, by percentage to the quality, decanol gathers
Oxypropylene (22) ether acetic acid potassium 54.05%, potassium bromide 4.05%, glycolic potassium 0.41%, ethanol 5.07%, water 36.42%.
(2) S04 that prepared with Henan Oil Field simulated formation water B preparation steps (1), modified polyacrylamide (P3, comonomer
Ten thousand) and aqueous sodium carbonate AM/AMPS mol ratio=4/1, viscosity-average molecular weight 1500, are stirred 4 hours, and temperature of the measurement is
80 DEG C, remaining is same【Embodiment 1】(1), the results are shown in Table shown in 7.The S04 of variable concentrations is prepared with oil field simulated formation water
Aqueous solution, determines its oil water interfacial tension, is shown in Table 4.
(3) it is same【Embodiment 1】(3) laboratory simulation flooding test is carried out, it is 80 DEG C that difference is displacement of reservoir oil temperature, as a result
It is shown in Table 7.
【Embodiment 5】
(1) the polyether carboxylation's surfactant structure formula for preparing is as follows：
328 grams of (1 mole) docosanols, 15.1 grams of anhydrous carbon are added in the 2.5L pressure reactors equipped with agitating device
Sour potassium, together【Embodiment 1】Eliminating water and nitrogen displacement are carried out, system reaction temperature is adjusted to into 140 DEG C and is slowly passed through 1122.0
Gram (25.5 moles) expoxy propane, control pressure≤0.50MPa, after propylene oxide reaction terminates, cooling, together【Embodiment
1】Post processing, obtains 1408.0 grams of docosanol Polyethylene oxide (25) ether, yield 98.6%.
714 grams of docosanol Polyethylene oxide (25) ether (0.5 mole) and 128.8 grams of (2.3 moles) potassium hydroxide are added and are furnished with
In the reaction bulb of 2500 milliliters of mechanical agitation, thermometer and reflux condensing tube, under stirring, 150.6 gram (1.0 is slowly dropped into
Mole) Solid acid n-butyl chloroacete, 110 DEG C of controlling reaction temperature reacts 5 hours, and 400 grams of water and 50 gram 95% are added after cooling
Ethanol, continues to be heated to back flow reaction 3 hours.Room temperature is cooled to, surface activator composition S05 is obtained, needed for obtaining
Surfactant S05, by percentage to the quality, docosanol Polyethylene oxide (25) ether acetic acid potassium 53.17%, potassium chloride
2.63%, glycolic potassium 4.03%, potassium hydroxide 1.19%, mixed alcohol (ethanol+n-butyl alcohol) 8.66%, water 30.32%.
(2) S05 for being prepared with Zhongyuan Oil Field simulated formation water D preparation steps (1) and hydrophobic associated polymer (P2, copolymerization
AM/AMPS/2- acrylamidos dodecyl sodium sulfonate mol ratio=1/0.5/0.002, the ten thousand) aqueous solution of viscosity-average molecular weight 1800,
Stirring 4 hours, temperature of the measurement are 95 DEG C, and remaining is same【Embodiment 1】(1), the results are shown in Table shown in 8.With oil field simulation ground
Layer water prepares the S05 aqueous solutions of variable concentrations, determines its interfacial tension to oil field dewatered oil, is shown in Table 4.
(3) it is same【Embodiment 1】(3) laboratory simulation flooding test is carried out, it is 95 DEG C that difference is displacement of reservoir oil temperature, as a result
It is shown in Table 8.
【Embodiment 6】
(1) the polyether carboxylation's surfactant structure formula for preparing is as follows：
Together【Embodiment 5】, difference added concentrated hydrochloric acid to adjust pH=2, adds 57.8 reactant liquor is being cooled to 30 DEG C
In the diethanolamine of gram (0.55 mole) and the carboxylic acid that generates, the surfactant S06 needed for obtaining, by percentage to the quality,
Docosanol Polyethylene oxide (25) ether acetic acid diethanolamine salt 53.12%, potassium chloride 6.41%, glycolic potassium 3.76% are mixed
Close alcohol (ethanol+n-butyl alcohol) 8.15%, water 28.56%.
(2) it is same【Embodiment 5】(2), the results are shown in Table shown in 9, table 4.
(3) it is same【Embodiment 5】(3) laboratory simulation flooding test is carried out, is the results are shown in Table shown in 9.
【Embodiment 7】
Surfactant simulation saline solution is loaded in 20 milliliters of peace a word used in place name bottles, is put into after sealing in baking oven, determine different old
After the change time, surfactant simulation saline pair and the oil water interfacial tension of crude oil, it is found that aging rear oil water interfacial tension can still be protected
Hold 10-3～10-4The ultralow value of mN/m, is shown in Table 10.The TX500 that interfacial tension is produced by Texas ,Usa university
Type rotating interfacial tensimeter is determined.
【Comparative example 1】
Together【Embodiment 1】, difference is, after reaction terminates, adds 30% hydrochloric acid to adjust water in the reactive mixture
PH=1～3 of phase, decompression remove ethanol, and isolated organic faciess are that hexadecanol Polyethylene oxide (3) polyoxypropylene (8) gathers
Oxygen ethylene (4) ether acetic acid, adds water, adjusts the pH=9 of product with 40% potassium hydroxide solution, obtains surface after purification
Activating agent hexadecanol Polyethylene oxide (3) polyoxypropylene (8) Polyethylene oxide (4) ether acetic acid S07, by percentage to the quality,
Hexadecanol Polyethylene oxide (3) polyoxypropylene (8) Polyethylene oxide (4) ether acetic acid 45.89%, potassium hydroxide 0.87%, water
53.24%.Together【Embodiment 1】Oil water interfacial tension is determined, be the results are shown in Table shown in 11.
【Comparative example 2】
By a certain amount of contrast surfactant with the simulation saline A of different salinities～D dissolvings, variable concentrations contrast is determined
Oil water interfacial tension of the surfactant solution to several crude oil, the results are shown in Table shown in 11.Interfacial tension is by U.S. De Kesa
The TX500 types rotating interfacial tensimeter of this university's production is determined.
In table 11, S08 is hexadecanol Polyethylene oxide (3) polyoxypropylene (8) Polyethylene oxide (4) ether；S09 is nonyl
Phenol polyethenoxy (2) polyoxypropylene (10) Polyethylene oxide (3) ether；S10 is 12/14 (C of mixing12～14) alcohol gather
Oxygen ethylene (5) polyoxypropylene (4) Polyethylene oxide (20) ether；S11：Decanol polyoxypropylene (22) ether；S12：20
Glycol Polyethylene oxide (25) ether.
【Comparative example 3】
Together【Embodiment 1】, difference is successively not reacted step by step with expoxy propane and oxirane,
But both are mixed into the reaction of later stepping row.Slowly be passed through at 140～150 DEG C 469.8 grams of (8.1 moles) expoxy propane and
310.2 grams of (7.05 moles) ethylene oxide mixtures, control pressure≤0.60MPa, remaining is identical, obtains containing polyether carboxylation
Surfactant mixture S13.Together【Embodiment 1】Interface performance determination test is carried out, be the results are shown in Table shown in 11.
【Comparative example 4】
Together【Embodiment 2】, difference is successively not reacted step by step with expoxy propane and oxirane,
But both are mixed into the reaction of later stepping row.Slowly be passed through at 140～150 DEG C 585.8 grams of (10.1 moles) expoxy propane and
222.2 grams of (5.05 moles) ethylene oxide mixtures, control pressure≤0.60MPa, remaining is identical, obtains containing polyether carboxylation
Surfactant mixture S14.Together【Embodiment 1】Interface performance determination test is carried out, be the results are shown in Table shown in 11.
【Comparative example 5】
Together【Embodiment 3】, difference is successively not reacted step by step with expoxy propane and oxirane,
But both are mixed into the reaction of later stepping row.Slowly be passed through at 120～160 DEG C 234.9 grams of (4.05 moles) expoxy propane and
11144 grams of (26.0 moles) ethylene oxide mixtures, remaining is identical, obtains the S15 of surfactant mixture containing polyether carboxylation.
Together【Embodiment 1】Interface performance determination test is carried out, be the results are shown in Table shown in 11.
【Comparative example 6】
Together【Embodiment 1】, difference is that (viscosity-average molecular weight is 2500 with high molecular wt. anionic polyacrylamide P4
Ten thousand) hydrophobic associated polymer P1 is substituted, remaining is identical, as a result as shown in 12.
Table 1
| Simulation saline | Ca2+(mg/L) | Mg2+(mg/L) | TDS(mg/L) |
| A | 1200 | 400 | 32000 |
| B | 20 | 12 | 8000 |
| C | 15000 | 8000 | 180000 |
| D | 4000 | 1250 | 250000 |
Table 2
| Crude oil | Crude oil origin | Underground crude oil sticks (mPa.s) |
| I | Shengli Oil Field | 34.55. |
| II | Henan Oil Field | 3.51 |
| III | Zhongyuan Oil Field | 1.84 |
Table 3
Table 4
| Surfactant | Simulation saline | Temperature (DEG C) | Crude oil | Concentration (%) | IFT(mN/m) |
| S01 | A | 87 | I | 0.6 | 0.00881 |
| S01 | A | 87 | I | 0.3 | 0.00052 |
| S01 | A | 87 | I | 0.1 | 0.00235 |
| S01 | A | 87 | I | 0.05 | 0.00524 |
| S01 | A | 87 | I | 0.025 | 0.00742 |
| S01 | A | 87 | I | 0.01 | 0.05271 |
| S01 | A | 87 | I | 0.005 | 0.08145 |
| S01 | A | 87 | I | 0.001 | 0.51241 |
| S01 | B | 80 | II | 0.3 | 0.01724 |
| S01 | C | 90 | III | 0.3 | 0.21483 |
| S02 | A | 87 | I | 0.3 | 0.00071 |
| S02 | A | 87 | I | 0.05 | 0.00454 |
| S02 | A | 87 | I | 0.01 | 0.01879 |
| S02 | A | 87 | I | 0.005 | 0.04117 |
| S02 | B | 80 | II | 0.3 | 0.00721 |
| S02 | C | 90 | III | 0.3 | 0.46772 |
| S03 | C | 90 | III | 0.6 | 0.00081 |
| S03 | C | 90 | III | 0.3 | 0.00095 |
| S03 | C | 90 | III | 0.05 | 0.00425 |
| S03 | C | 90 | III | 0.01 | 0.00851 |
| S03 | C | 90 | III | 0.005 | 0.02221 |
| S04 | B | 80 | II | 0.4 | 0.00078 |
| S04 | B | 80 | II | 0.2 | 0.00226 |
| S04 | B | 80 | II | 0.05 | 0.00546 |
| S04 | B | 80 | II | 0.01 | 0.01579 |
| S04 | B | 80 | II | 0.005 | 0.08635 |
| S04 | C | 90 | III | 0.1 | 0.08771 |
| S05 | D | 95 | III | 0.3 | 0.00456 |
| S05 | D | 95 | III | 0.1 | 0.00072 |
| S05 | D | 95 | III | 0.025 | 0.00231 |
| S05 | D | 95 | III | 0.01 | 0.00667 |
| S05 | D | 95 | III | 0.005 | 0.04331 |
| S05 | D | 95 | III | 0.001 | 0.52121 |
| S06 | D | 95 | III | 0.3 | 0.00322 |
| S06 | D | 95 | III | 0.1 | 0.00059 |
| S06 | D | 95 | III | 0.025 | 0.00145 |
| S06 | D | 95 | III | 0.01 | 0.00544 |
| S06 | D | 95 | III | 0.005 | 0.06331 |
| S06 | D | 95 | III | 0.001 | 0.09741 |
Table 5
Table 6
Table 7
Table 8
Table 9
Table 10
| Surfactant | Simulation saline | Temperature (DEG C) | Crude oil | Concentration (%) | Ageing time (d) | IFT(mN/m) |
| S01 | A | 87 | I | 0.3 | 0 | 0.00052 |
| S01 | A | 87 | I | 0.3 | 30 | 0.00046 |
| S01 | A | 87 | I | 0.3 | 60 | 0.00245 |
| S01 | A | 87 | I | 0.3 | 90 | 0.00433 |
| S01 | A | 87 | I | 0.3 | 180 | 0.00288 |
| S02 | A | 87 | I | 0.3 | 0 | 0.00071 |
| S02 | A | 87 | I | 0.3 | 30 | 0.00053 |
| S02 | A | 87 | I | 0.3 | 60 | 0.00121 |
| S02 | A | 87 | I | 0.3 | 90 | 0.00457 |
| S02 | A | 87 | I | 0.3 | 180 | 0.00571 |
| S03 | C | 90 | III | 0.3 | 0 | 0.00095 |
| S03 | C | 90 | III | 0.3 | 30 | 0.00107 |
| S03 | C | 90 | III | 0.3 | 60 | 0.00367 |
| S03 | C | 90 | III | 0.3 | 90 | 0.00256 |
| S03 | C | 90 | III | 0.3 | 180 | 0.00546 |
| S04 | B | 80 | II | 0.2 | 0 | 0.00226 |
| S04 | B | 80 | II | 0.2 | 60 | 0.00322 |
| S04 | B | 80 | II | 0.2 | 90 | 0.00087 |
| S04 | B | 80 | II | 0.2 | 180 | 0.00095 |
| S05 | D | 95 | III | 0.3 | 0 | 0.00456 |
| S05 | D | 95 | III | 0.3 | 15 | 0.00302 |
| S05 | D | 95 | III | 0.3 | 60 | 0.00453 |
| S05 | D | 95 | III | 0.3 | 180 | 0.00577 |
| S06 | D | 95 | III | 0.1 | 0 | 0.00544 |
| S06 | D | 95 | III | 0.1 | 15 | 0.00489 |
| S06 | D | 95 | III | 0.1 | 60 | 0.00688 |
| S06 | D | 95 | III | 0.1 | 180 | 0.00752 |
Table 11
Table 12
Claims (10)
1. a kind of method that low cost improves oil recovery factor, comprises the following steps：
(1) oil displacement agent and water are mixed to get into oil displacement system；
(2) by the oil displacement system in 25～120 DEG C of displacement of reservoir oil temperature, total salinity>Under 500 mg/litre stratum water conditions with
Oil bearing bed is contacted, by the mother oil displacement in the oil bearing bed out；
Wherein, described oil displacement agent, in terms of mass fraction, including following components：
1) 1 part of surfactant；
2) 0～50 part of polymer；
3) 0～50 part of alkali；
It is 0 when the polymer is different with the amount of alkali；The surfactant is anion-nonionic surfactant and salt and alcohol
Mixture；The polymer is the polymer suitable for oil extraction in oil field；The alkali is inorganic base or at least one in organic amine；
In the oil displacement system, in terms of total oil displacement system quality, the concentration containing the surfactant is 0.001～2.0wt%, is contained
The concentration of the polymer is 0～1.8wt%, and the concentration containing the alkali is 0～2.0wt%.
2. the method that low cost according to claim 1 improves oil recovery factor, it is characterised in that the surface activity
Agent is the polyether carboxylic acid's salt surfactant shown in Formulas I, alcohol and salt with mol ratio as 1：(1～10)：(1～10) formed
Mixture；
R1X(CH2CH2O)m1(CH3CHCH2O)n(CH2CH2O)m2R2COOM, Formulas I；
X is O, R1For C8～C30Aliphatic group or by C4～C20The saturation and unsaturated alkyl of straight or branched takes
The phenyl ring or naphthalene nucleus in generation；Or R1X is abietate；M1=0～50, m2=0～50, n=0～100, R2For C1～C5
Alkylidene or hydroxyl substituted alkylene；M is selected from hydrogen, alkali metal or by formula NR4(R5)(R6)(R7) shown in group extremely
Few one kind；R4、R5、R6、R7To be independently selected from H, (CH2)aOH or (CH2)b CH3In one kind, a=2～4,
Any integer in b=0～5；At least one of the salt in metal halide, acylate；The alcohol is selected from C1～C6
Short carbon chain alcohol.
3. the method that low cost according to claim 1 improves oil recovery factor, it is characterised in that the R1For C12~
C24Alkyl or by C8～C12Alkyl-substituted phenyl or R1X is abietate, R2For C1～C3Alkylidene or hydroxyl
Substituted alkylene, m1=0～30, m2=0～30, n=0～30, and m1+m2 are zero, a=2, b=0 when different from n
Or 1；The metal halide is selected from alkali halide, the carboxylate that acylate replaces selected from hydroxyl.
4. the method that low cost according to claim 1 improves oil recovery factor, it is characterised in that the polymer is
Xanthan gum, hydroxymethyl cellulose, hydroxyethyl cellulose, anion-polyacrylamide, modified polyacrylamide, hydrophobic form
Close at least one in polymer, polymer microballoon.
5. the method that low cost according to claim 4 improves oil recovery factor, it is characterised in that the hydrophobic association
Polymer is formed by acrylamide, temperature-resistant anti-salt monomer and hydrophobic monomer copolymerization, and the mol ratio of three kinds of monomers is 1：
(0.1～20)：(0.001～0.01), viscosity-average molecular weight are 1200～22,000,000；The modified polyacrylamide is by propylene
Amide, two kinds of monomer copolymerizations of 2- acrylamide-2-methylpro panesulfonic acids are formed, and two kinds of monomer mole ratios are (0.1～40): 1,
Viscosity-average molecular weight is 800～25,000,000.
6. the method that low cost according to claim 1 improves oil recovery factor, it is characterised in that the inorganic alkaline
At least one of the material in alkali metal hydroxide, alkaline earth metal hydroxide, alkali carbonate.
7. the displacement composition containing polyether carboxylic acid's salt surfactant according to claim 1, it is characterised in that described
Organic basic material is in molecule containing at least one in primary amine groups, secondary amine, tertiary amine groups, quaternary ammonium base.
8. the method that low cost according to claim 1 improves oil recovery factor, it is characterised in that in the oil displacement agent
Surfactant and polymer and the mass ratio 1 of alkaline matter: (0～2)：(0～5).
9. the method that a kind of arbitrary described low cost of claim 1～8 improves oil recovery factor, it is characterised in that the drive
The preparation method of fluid composition, comprises the following steps：
(1) in the presence of base catalyst, R1XH successively with aequum oxirane, expoxy propane, reacting ethylene oxide
Obtain R1X(CH2CH2O)m1(CH3CHCH2O)n(CH2CH2O)m2H；
(2) by R1X(CH2CH2O)m1(CH3CHCH2O)n(CH2CH2O)m2H and YR2COOR3And alkali metal hydrogen-oxygen
Compound or alkali metal alcoholates are with mol ratio 1:(1～5):(1～10) mix, in 50～120 DEG C of reaction temperature under stirring, instead
Answer 3～15 hours, obtain polyether carboxylate intermediate
R1X(CH2CH2O)m1(CH3CHCH2O)n(CH2CH2O)m2R2COOR3, add water or alcohol water to carry out saponification without the need for separating
Reaction, the surfactant mixture containing polyether carboxylation after flowing back 1～10 hour, needed for obtaining；
(3) based on the mass fraction, the surfactant mixture that step (2) is obtained is mixed homogeneously with polymer, alkali,
Obtain described displacement composition.
Wherein, R3Selected from C1～C8Alkyl；Y is selected from chlorine, bromine or iodine；Base catalyst be alkali metal hydroxide or
At least one in carbonate, alkaline earth metal hydroxide or carbonate；Alcohol in alcohol-water solution is C1～C6Short carbon chain alcohol.
10. the method that low cost according to claim 9 improves oil recovery factor, it is characterised in that described in step (2)
Y is selected from chlorine, bromine；R3Selected from C1～C4Alkyl, alkali metal hydroxide be in potassium hydroxide or sodium hydroxide at least
One kind, R1X(CH2CH2O)m1(CH3CHCH2O)n(CH2CH2O)m2H and YR2COOR3And alkali metal hydroxide
Or the mol ratio of alkali metal alcoholates is 1:(1～3):(2～6), alcohol are C1～C5Short carbon chain alcohol.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN114058356A (en) * | 2020-08-06 | 2022-02-18 | 中国石油化工股份有限公司 | Thick oil viscosity reducer and thick oil viscosity reduction cold recovery method |
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| CN108048067A (en) * | 2017-11-24 | 2018-05-18 | 三原弘迪森精细化工有限公司 | A kind of preparation method of pressure break biogum |
| CN111808595A (en) * | 2020-07-20 | 2020-10-23 | 中国石油大学(华东) | Application of biquaternary ammonium salt surfactant in viscosity reduction of thick oil |
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| CN114075433A (en) * | 2020-08-13 | 2022-02-22 | 中国石油化工股份有限公司 | Novel oil-soluble thick oil viscosity reducer and preparation method thereof |
| CN114540002A (en) * | 2020-11-24 | 2022-05-27 | 中国石油天然气股份有限公司 | Salt-tolerant low-interfacial-tension foam oil displacement agent |
| CN114540002B (en) * | 2020-11-24 | 2023-04-25 | 中国石油天然气股份有限公司 | Salt-resistant low-interfacial tension foam oil displacement agent |
| CN115466610A (en) * | 2022-11-03 | 2022-12-13 | 海域泰和(山东)能源科技有限公司 | Oil displacement agent for improving recovery ratio of sandstone oil reservoir and preparation method and application thereof |
| CN115466610B (en) * | 2022-11-03 | 2023-02-21 | 海域泰和(山东)能源科技有限公司 | Oil displacement agent for improving recovery ratio of sandstone oil reservoir and preparation method and application thereof |
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