CN104277807A - Alkali-free oil displacement system suitable for high-temperature high wax-bearing oil reservoirs and application thereof - Google Patents
Alkali-free oil displacement system suitable for high-temperature high wax-bearing oil reservoirs and application thereof Download PDFInfo
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- CN104277807A CN104277807A CN201310286140.5A CN201310286140A CN104277807A CN 104277807 A CN104277807 A CN 104277807A CN 201310286140 A CN201310286140 A CN 201310286140A CN 104277807 A CN104277807 A CN 104277807A
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- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/584—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific surfactants
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- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/588—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific polymers
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Abstract
The invention relates to an alkali-free oil displacement system suitable for high-temperature high wax-bearing oil reservoirs and aims to mainly solve the problem that a present oil displacement system has poor oil displacement efficiency under the condition of high-temperature high wax-bearing oil reservoirs. The alkali-free oil displacement system suitable for high-temperature high wax-bearing oil fields comprises a long-carbon-chain betaine surfactant, polymer and water. The betaine surfactant is any one selected from carboxylate betaine and sulfonate betaine which are respectively as shown in the formula (I) and the formula (II), wherein R1 and R4 are any one independently selected from an alkyl group and an alkenyl group with C15-C29; R2 and R5 are any one selected from an alkylene group and a hydroxy-substituted alkylene group with C2-C5; and R3 and R6 are any one selected from an alkylene group and a hydroxy-substituted alkylene group with C1-C5. Water is selected from oilfield injection water. By the technical scheme, the above problem is solved well. The alkali-free oil displacement system can be used in tertiary oil recovery of high-temperature high wax-bearing oil fields.
Description
Technical field
The present invention relates to a kind of alkali-free flooding system and application thereof of applicable high temperature high-content wax oil reservoir.
Background technology
Along with increasing rapidly of national economy, domestic petroleum disparities between supply and demand become increasingly conspicuous, and the growth that main manifestations is that hydrocarbon resources is relatively poor, the exploratory development of oil and proven reserve do not catch up with demand, the recovery percent of reserves of crude oil are lower.Have scholarly forecast, the crude oil breach of 2015 will reach 1.84 hundred million tons.So large breach will solve by international petroleum market, will certainly produce material impact, also form great threat to the energy security of country to the sustainable development of China's economy.For alleviating China's oil scarcity of resources, reducing crude production rate breach, ensureing China's oil safety, need one of important measures taked will increase substantially the recovery ratio of crude oil in China exactly.Such as, the average recovery ratio of current Sinopec is only 28%, still has the petroleum resources more than 70% to fail to obtain effective exploitation and utilizes, cause a large amount of remaining reserves to be retained in underground.How further enhancing efficiency by relying on tapping internal latent power, carry out tertiary oil recovery, become one of problem urgently to be resolved hurrily.
In tertiary oil recovery technology, chemical flooding is main attack technology and the direction that recovery ratio improves in China, comprises caustic waterflooding, surfactant flooding (micella drives and drives with microemulsion), polymer flooding and combination flooding.In these chemical flooding technology, all be unableing to do without efficient tensio-active agent, (being less than 10 by reducing oil water interfacial tension to ultra low degree
-2mN/m) irreducible oil is made to flow to reach the object improving oil recovery factor.In the patent application at beginning of the thirties late 1920s, Degroot (De Groot) just once proposed the recovery ratio that water soluble surfactant active contributes to improving oil.Tensio-active agent for tertiary oil recovery has anion surfactant, nonionogenic tenside, anion-nonionic tensio-active agent, zwitterionics, Gemini surface active agent and special surface active agent (as fluorine surfactant, Silicon surfactant and bio-surfactant) etc.At present, the maximum surfactant oil displacement of employing is the anion surfactant based on sodium salt both at home and abroad, and this kind of tensio-active agent has the advantage that source is wide, quantity is large, price is low, and obtains successful Application (CN1458219A) at common oil reservoir.But the salt resistant character of anion surfactant is poor, be difficult to the reservoir media of competent high salinity.The ability of nonionogenic tenside salt tolerant, resistance to hard water is comparatively strong, have good emulsifying performance, can produce ultra low interfacial tension, but to temperature sensitive, easily separate out under high temperature, and environmental pollution degree is large, should not use in a large number.For this reason, people start the research of anion-nonionic tensio-active agent, design in same surfactant molecule by two kinds of non-ionic groups of different nature and anionic group, it is made to have the advantage of negatively charged ion and nonionogenic tenside concurrently, have complementary advantages, there is excellent temperature resistant antisalt performance, demonstrate good application prospect.Gemini surface active agent has the special construction being different from conventional surfactant, gives it and has a series of peculiar properties such as ultra low interfacial tension, low micelle-forming concentration, low Krafft point and excellent wettability, also result in the great interest of people.But the Gemini surface active agent mainly positively charged ion double quaternary ammonium salt type of current domestic-developed, existence absorption loss is large, high in cost of production shortcoming, loses the economic base of application.Special surface active agent due to price extremely expensive, major part also rests on indoor phase of basic research, is difficult to apply at the scene.In zwitterionics molecule, existing anionic hydrophilic base has again cationic hydrophilic base and presents both sexes, wider pH value scope can be adapted to, stronger sequestering action is had to metal ion, can be used for the oil reservoir displacement of reservoir oil of high salinity, comparatively high temps, and can greatly reduce nonionic surface active agent and aniorfic surfactant composite time chromatographic fractionation effect.Therefore, the research and development of zwitterionics obtain people and more and more pay attention to and pay close attention to, and especially the amphoterics of sulfobetaines bases has become one of focus of tertiary oil recovery field research.
Day by day deep along with oilfield exploitation degree, be applied in the good tensio-active agent of performance in common oil reservoir and high temperature and high salt oil deposit and can not form ultra low interfacial tension with high wax content oil under the high temperature conditions, cause oil displacement efficiency to be deteriorated, seriously constrain the raising of high temperature high-content wax oil recovery rate.In order to reduce oil/water interfacial tension to a greater extent, often add the alkali (as sodium hydroxide, sodium carbonate etc.) of high density, such as, document CN1439689A discloses a kind of ternary composite oil-displacing system and application thereof of alkali, mixed surfactant and polymer, and the alkali wherein selected is Na
2cO
3.But alkali in use formation and oil well etc. brings huge injury, severe corrosion equipment and pipeline, maintenance, maintenance spend substantial contribution, considerably increases the Financial cost of tertiary oil recovery.Document CN1334895A proposes and a kind ofly adopts alpha-olefin derived alkylaryl sulfonate surfactants to gather the method for waxy crude oil, obtained product passes through alkylated reaction by carbonatoms in distribute wide alpha-olefin and aromatic substance of 12-58, the mixture made through sulfonation neutralization again, there is the problem that chromatographic fractionation effect causes oil displacement efficiency to be deteriorated, contain heteroaryl structure not readily biodegradable in product simultaneously, larger to the harm of human body and environment.
Therefore, for the deficiencies in the prior art and single tensio-active agent be difficult to meet oil water interfacial tension to be down under high temperature high-content wax reservoir condition ultralow, Heat stability is good, compatibleness are good, without displacement of reservoir oil requirements such as chromatographic separation, be badly in need of providing a kind of under alkali-free, high-temperature oil reservoir condition steady chemical structure, 10 can be formed with high wax content oil
-3~ 10
-4the novel flooding system of mN/m ultra low interfacial tension, effectively raising oil recovery factor, is extended to the scope improving recovery ratio in the application in the harsh oil fields such as high temperature high-content wax.
Summary of the invention
One of technical problem to be solved by this invention is the problem that existing flooding system oil displacement efficiency under high temperature high-content wax reservoir condition is poor, alkali brings corrosion and incrustation injury to oil well and stratum, provides a kind of alkali-free flooding system of applicable high temperature high-content wax oil reservoir.This flooding system have oil displacement efficiency under high temperature high-content wax reservoir condition good, do not exist alkali to oil well and stratum bring corrosion and incrustation injury feature.
Two of technical problem to be solved by this invention is to provide the application of the alkali-free flooding system corresponding with one of technical solution problem in high temperature high-content wax oil reservoir.
For one of solving the problems of the technologies described above, the technical solution used in the present invention is as follows: the alkali-free flooding system being applicable to high temperature high-content wax oil field, comprises following component in mass parts:
(1) Long carbon chain beet alkali surface activator 0.01 ~ 5.0 part;
(2) 0.01 ~ 3.0 part, polymkeric substance;
(3) 92.0 ~ 99.98 parts, water;
Wherein, Long carbon chain beet alkali surface activator is selected from least one in long-chain carboxylic acid's betaine salt, sulphonate betaine, and its general molecular formula is respectively such as formula shown in (I) and formula (II):
Formula (I)
Formula (II)
Described R
1and R
4independently be selected from C
15~ C
29alkyl, any one in thiazolinyl; Described R
2and R
5independently be selected from C
2~ C
5alkylidene group, at least one in hydroxyl substituted alkylene; Described R
3and R
6independently be selected from C
1~ C
5alkylidene group, any one in hydroxyl substituted alkylene; Polymkeric substance is selected from least one in super high molecular weight polyacrylamide, Heat Resistant and Salt Tolerant Polymer or xanthan gum; Wet concentration is from oilfield injection water.
In technique scheme, R in described Long carbon chain beet alkali surface activator
1, R
4be preferably C
17~ C
25alkyl or alkenyl in any one, R
2, R
5be preferably C
2~ C
3alkylidene group or hydroxyl substituted alkylene in any one, R
3, R
6be preferably C
1~ C
3alkylidene group.R in described Long carbon chain beet alkali surface activator
1, R
4more excellent is C
21alkyl or alkenyl in any one, R
2, R
5be more preferably C
3alkylidene group or hydroxyl substituted alkylene in any one, R
3be more preferably C
1alkylidene group, R
6be more preferably C
2alkylidene group.
In technique scheme, the viscosity-average molecular weight of described super high molecular weight polyacrylamide be not less than 2,500 ten thousand polyacrylamide, such as 2,500 ten thousand ~ 4,000 ten thousand.
In technique scheme, one of preferably described Long carbon chain beet alkali surface activator is preferably R
1for C
15~ C
29long carbon chain carboxylate salt trimethyl-glycine, described alkali-free flooding system also comprises as shown in the formula (I) but R
1for C
8~ C
12short carbon chain carboxylate salt trimethyl-glycine.Preferably two, described Long carbon chain beet alkali surface activator is preferably R
1for C
15~ C
29long carbon chain sulphonate betaine, described alkali-free flooding system also comprises as shown in the formula (II) but R
1for C
8~ C
12short carbon chain sulphonate betaine.As another kind of preferred version, described Long carbon chain beet alkali surface activator is preferably made up of Long carbon chain carboxylate salt trimethyl-glycine and Long carbon chain sulphonate betaine.
In technique scheme, as long as the Long carbon chain beet alkali surface activator described in the formula of providing (I), those skilled in the art do not need creative work namely can obtain this component by the usual synthesizing mean in this area, but preferably following methods obtains: by Long carbon chain fatty acid methyl ester R
1cOOCH
3with required amidation reagent NH
2r
2n (CH
3)
2in 100 ~ 160 DEG C of reactions 3 ~ 20 hours; Then add carboxylating reagent XR
3cOOM continues reaction 2 ~ 20 hours in 50 ~ 100 DEG C, obtains the Long carbon chain beet alkali surface activator described in formula (I); Wherein, Long carbon chain fatty acid methyl ester: amidation reagent: the mol ratio of carboxylating reagent is 1:(1 ~ 3): (1 ~ 4); X is selected from Br or Cl, and M is selected from K or Na.In like manner, the preferred following methods of Long carbon chain beet alkali surface activator described in formula (II) obtains: by Long carbon chain fatty acid methyl ester R
4cOOCH
3with required amidation reagent NH
2r
5n (CH
3)
2in 100 ~ 160 DEG C of reactions 3 ~ 20 hours; Then add sulfonated reagent XR
6sO
3m continues reaction 2 ~ 20 hours in 50 ~ 100 DEG C, obtains the Long carbon chain beet alkali surface activator described in formula (I); Wherein, Long carbon chain fatty acid methyl ester: amidation reagent: sulfonated reagent mol ratio is 1:(1 ~ 3): (1 ~ 4); X is selected from Br or Cl, and M is selected from K or Na.
In technique scheme, the Heat Resistant and Salt Tolerant Polymer that this area is commonly used all can be used for the present invention, such as hydrophobic associated polymer, amphoteric ion polymer, comb-shaped polymer.
In technique scheme, described oilfield injection water salinity and water type are not particularly limited, object of the present invention can be reached, such as total mineralization is 3000mg/L ~ 150000mg/L, such as total mineralization is 5000mg/L ~ 20000mg/L again, can be sulfate-sodium type, magnesium chloride water type, calcium chloride water type, sodium bicarbonate water type.
For solve the problems of the technologies described above two, the technical solution used in the present invention is as follows: the application of alkali-free flooding system according to any one of technique scheme in high temperature high-content wax oil reservoir oil displacement.Described reservoir temperature is preferably 60 ~ 100 DEG C.Described flooding system is not particularly limited the wax content in oil reservoir, all can reach good oil displacement efficiency, but this area faces outstanding technical difficulty during wax content height in oil reservoir, from this angle, the present invention is particularly useful for the oil reservoir oil displacement of high wax content, such as the situation of oil reservoir Crude Oil wax content 15 ~ 36wt%.
The evaluation method of flooding system of the present invention and application is as follows: be 30 centimetres in length, and diameter is 2.5 centimetres, and rate of permeation is 1.5 microns
2rock core on, first with oilfield injection water, rock core is saturated, measure the volume of voids (PV) of rock core, then carry out saturated with the dewatered oil of high-content wax, imitation oil displacement experiment test is carried out: first water drive is to moisture 92% at the temperature of 60 ~ 100 DEG C, metaideophone 0.3 PV(rock pore volume) after flooding system, then water drive is to moisture 100%, calculates the percentage ratio improving oil recovery factor.
Alkali-free flooding system of the present invention has higher interfacial activity, can be adsorbed on water-oil interface place quickly, and oil water interfacial tension can be down to ultralow (10 by within a short period of time
-3~ 10
-5mN/m), improve oil recovery factor up to 23.9%, achieve good technique effect.
Below by embodiment, the present invention is further elaborated.
Embodiment
[embodiment 1]
(1) palmitic amide carboxyl betaine surfactant (R
1=C
15, R
2=C
2, R
3=C
1) preparation
By the Long carbon chain methyl palmitate of 0.5 mole and the amidation reagent N of aequum, N-dimethyl-ethylenediamine adds in reactor, 130 DEG C of reactions 6 hours, open vacuum pump, extract methyl alcohol and excessive N, the N-dimethyl-ethylenediamine of reaction generation, obtain palmitic acid acyl group tertiary amine product, the sodium chloroacetate adding aequum again, in 70 DEG C of reactions 12 hours, obtains Long carbon chain beet alkali surface activator after purifying with dehydrated alcohol recrystallization; Wherein, methyl palmitate: N, N-dimethyl-ethylenediamine: the mol ratio of sodium chloroacetate is 1:2:1.5.
(2) preparation of the alkali-free flooding system of high temperature high-content wax oil reservoir is applicable to
By obtained palmitic amide carboxyl betaine surfactant, viscosity-average molecular weight be 3,000 ten thousand super high molecular weight polyacrylamide and salinity be that the oilfield injection water of 8730mg/L stirs, obtain required flooding system, by percentage to the quality, the proportioning of palmitic amide carboxyl betaine surfactant, super high molecular weight polyacrylamide and oilfield injection water is 0.3wt%:0.15wt%:99.55wt%.
(3) application of alkali-free flooding system in high temperature high-content wax oil reservoir
When temperature 92.4 DEG C, record the ultra low interfacial tension forming 0.0006mN/m between crude oil that this flooding system and wax content are 21.3wt%, the TX500 type that interfacial tension is produced by Texas ,Usa university rotates and drips interfacial tensimeter and measure.Be 30 centimetres in length, diameter is 2.5 centimetres, and rate of permeation is 1.5 microns
2rock core on carry out imitation oil displacement experiment test.Elder generation is 8730mg/L with total mineralization, water type is NaHCO
3oilfield injection water rock core is saturated, measure the volume of voids (PV) of rock core, then carry out saturated with the dewatered oil of high-content wax, imitation oil displacement experiment test is carried out at the temperature of 92.4 DEG C, first water drive is to moisture 92%, metaideophone 0.3 PV(rock pore volume) after alkali-free flooding system, then water drive is to moisture 100%, records and can improve oil recovery factor 19.3% again on water drive basis.
[embodiment 2]
(1) erucicamide carboxyl betaine surfactant (R
1=C
21, R
2=C
3, R
3=C
1) preparation
By the amidation reagent N of the methyl erucate of 0.5 mole and aequum, N-dimethylated propyl diethylenetriamine adds in reactor, 140 DEG C of reactions 8 hours, open vacuum pump, extract methyl alcohol and excessive N, the N-dimethylated propyl diethylenetriamine of reaction generation, obtain erucic acid acyl group tertiary amine product, add the sodium chloroacetate of aequum again, in 75 DEG C of reactions 9 hours, after purifying with dehydrated alcohol recrystallization, obtain Long carbon chain beet alkali surface activator; Wherein, methyl erucate: N, N-dimethylated propyl diethylenetriamine: the mol ratio of sodium chloroacetate is 1:2.5:1.5.
(2) preparation of the alkali-free flooding system of high temperature high-content wax oil reservoir is applicable to
" palmitic amide carboxyl betaine surfactant " is changed into " erucicamide carboxyl betaine surfactant ", and all the other are with embodiment 1.
(3) application of alkali-free flooding system in high temperature high-content wax oil reservoir
Under the oilfield injection water condition of temperature 92.4 DEG C, salinity 8730mg/L, record the ultra low interfacial tension forming 0.00008mN/m between crude oil that this flooding system and wax content are 21.3wt%, the TX500 type that interfacial tension is produced by Texas ,Usa university rotates and drips interfacial tensimeter and measure.Be 30 centimetres in length, diameter is 2.5 centimetres, and rate of permeation is 1.5 microns
2rock core on carry out imitation oil displacement experiment test.Elder generation is 8730mg/L with total mineralization, water type is NaHCO
3the oilfield injection water of type is saturated by rock core, measure the volume of voids (PV) of rock core, then carry out saturated with the dewatered oil of high-content wax, imitation oil displacement experiment test is carried out at the temperature of 92.4 DEG C, first water drive is to moisture 92%, metaideophone 0.3 PV(rock pore volume) after alkali-free flooding system, then water drive is to moisture 100%, records and can improve oil recovery factor 22.3% again on water drive basis.
[embodiment 3]
(1) erucicamide carboxyl betaine surfactant (R
1=C
21, R
2=C
3, R
3=C
2) preparation
By the amidation reagent N of the methyl erucate of 0.5 mole and aequum, N-dimethylated propyl diethylenetriamine adds in reactor, 145 DEG C of reactions 7 hours, open vacuum pump, extract methyl alcohol and excessive N, the N-dimethylated propyl diethylenetriamine of reaction generation, obtain erucic acid acyl group tertiary amine product, add the β-chloropropionic acid sodium of aequum again, in 75 DEG C of reactions 10 hours, after dehydrated alcohol recrystallization is purified, obtain Long carbon chain beet alkali surface activator; Wherein, the mol ratio of methyl erucate: N, N-dimethylated propyl diethylenetriamine: β-chloropropionic acid sodium is 1:2:1.6.
(2) preparation of the alkali-free flooding system of high temperature high-content wax oil reservoir is applicable to
" palmitic amide carboxyl betaine surfactant " is changed into " erucicamide carboxyl betaine surfactant ", and all the other are with embodiment 1.
(3) application of alkali-free flooding system in high temperature high-content wax oil reservoir
In the water of temperature 92.4 DEG C, salinity 8730mg/L, record the ultra low interfacial tension forming 0.0003mN/m between crude oil that this flooding system and wax content are 21.3wt%, the TX500 type that interfacial tension is produced by Texas ,Usa university rotates and drips interfacial tensimeter and measure.Be 30 centimetres in length, diameter is 2.5 centimetres, and rate of permeation is 1.5 microns
2rock core on carry out imitation oil displacement experiment test.Elder generation is 8730mg/L with total mineralization, water type is NaHCO
3the oilfield injection water of type is saturated by rock core, measure the volume of voids (PV) of rock core, then carry out saturated with the dewatered oil of high-content wax, imitation oil displacement experiment test is carried out at the temperature of 92.4 DEG C, first water drive is to moisture 92%, metaideophone 0.3 PV(rock pore volume) after alkali-free flooding system, then water drive is to moisture 100%, records and can improve oil recovery factor 20.7% again on water drive basis.
[embodiment 4]
(1) erucicamide sulfobetaine surfactant (R
4=C
21, R
5=C
3, R
6=C
3) preparation
By the amidation reagent N of the methyl erucate of 0.5 mole and aequum, N-dimethylated propyl diethylenetriamine adds in reactor, 145 DEG C of reactions 10 hours, open vacuum pump, extract methyl alcohol and excessive N, the N-dimethylated propyl diethylenetriamine of reaction generation, obtain erucic acid acyl group tertiary amine product, add the 3-chlorine-2-hydroxyl-propanesulfonate of aequum again, in 80 DEG C of reactions 14 hours, after dehydrated alcohol recrystallization is purified, obtain Long carbon chain beet alkali surface activator; Wherein, methyl erucate: N, N-dimethylated propyl diethylenetriamine: the mol ratio of 3-chlorine-2-hydroxyl-propanesulfonate is 1:2.5:2.0.
(2) preparation of the alkali-free flooding system of high temperature high-content wax oil reservoir is applicable to
" palmitic amide carboxyl betaine surfactant " is changed into " erucicamide sulfobetaine surfactant ", and all the other are the same.
(3) application of alkali-free flooding system in high temperature high-content wax oil reservoir
In the water of temperature 92.4 DEG C, salinity 8730mg/L, record the ultra low interfacial tension forming 0.0001mN/m between crude oil that this flooding system and wax content are 21.3wt%, the TX500 type that interfacial tension is produced by Texas ,Usa university rotates and drips interfacial tensimeter and measure.Be 30 centimetres in length, diameter is 2.5 centimetres, and rate of permeation is 1.5 microns
2rock core on carry out imitation oil displacement experiment test.Elder generation is 8730mg/L with total mineralization, water type is NaHCO
3the oilfield injection water of type is saturated by rock core, measure the volume of voids (PV) of rock core, then carry out saturated with the dewatered oil of high-content wax, imitation oil displacement experiment test is carried out: first water drive is to moisture 92% at the temperature of 92.4 DEG C, metaideophone 0.3 PV(rock pore volume) after alkali-free flooding system, water drive is to moisture 100% again, records and can improve oil recovery factor 21.6% again on water drive basis.
[embodiment 5]
(1) triacontanoic acid amido carboxyl beet alkali surface activator (R
1=C
29, R
2=C
2, R
3=C
1) preparation
By the Long carbon chain triacontanoic acid methyl esters of 0.5 mole and the amidation reagent N of aequum, N-dimethyl-ethylenediamine adds in reactor, 130 DEG C of reactions 6 hours, open vacuum pump, extract methyl alcohol and excessive N, the N-dimethyl-ethylenediamine of reaction generation, obtain triacontanoic acid acyl group tertiary amine product, add the sodium chloroacetate of aequum again, in 85 DEG C of reactions 15 hours, after dehydrated alcohol recrystallization is purified, obtain Long carbon chain beet alkali surface activator; Wherein, triacontanoic acid methyl esters: N, N-dimethyl-ethylenediamine: the mol ratio of sodium chloroacetate is 1:2:1.5.
(2) preparation of the alkali-free flooding system of high temperature high-content wax oil reservoir is applicable to
" palmitic amide carboxyl betaine surfactant " changed into " triacontanoic acid amido carboxyl beet alkali surface activator ", all the other are with embodiment 1.
(3) application of alkali-free flooding system in high temperature high-content wax oil reservoir
In the water of temperature 92.4 DEG C, salinity 8730mg/L, record the ultra low interfacial tension forming 0.001mN/m between crude oil that this flooding system and wax content are 21.3wt%, the TX500 type that interfacial tension is produced by Texas ,Usa university rotates and drips interfacial tensimeter and measure.Be 30 centimetres in length, diameter is 2.5 centimetres, and rate of permeation is 1.5 microns
2rock core on carry out imitation oil displacement experiment test.Elder generation is 8730mg/L with total mineralization, water type is NaHCO
3the oilfield injection water of type is saturated by rock core, measure the volume of voids (PV) of rock core, then carry out saturated with the dewatered oil of high-content wax, imitation oil displacement experiment test is carried out: first water drive is to moisture 92% at the temperature of 92.4 DEG C, metaideophone 0.3 PV(rock pore volume) after alkali-free flooding system, water drive is to moisture 100% again, records and can improve oil recovery factor 19.8% again on water drive basis.
[embodiment 6]
(1) triacontanoic acid amido carboxyl beet alkali surface activator (R
1=C
29, R
2=C
3, R
3=C
1) preparation
By the Long carbon chain triacontanoic acid methyl esters of 0.5 mole and the amidation reagent N of aequum, N-dimethylated propyl diethylenetriamine adds in reactor, 150 DEG C of reactions 8 hours, open vacuum pump, extract methyl alcohol and excessive N, the N-dimethylated propyl diethylenetriamine of reaction generation, obtain triacontanoic acid acyl group tertiary amine product, add the sodium chloroacetate of aequum again, in 85 DEG C of reactions 16 hours, after dehydrated alcohol recrystallization is purified, obtain Long carbon chain beet alkali surface activator; Wherein, triacontanoic acid methyl esters: N, N-dimethylated propyl diethylenetriamine: the mol ratio of sodium chloroacetate is 1:2:1.5.
(2) preparation of the alkali-free flooding system of high temperature high-content wax oil reservoir is applicable to
" palmitic amide carboxyl betaine surfactant " changed into " triacontanoic acid amido carboxyl beet alkali surface activator ", all the other are with embodiment 1.
(3) application of alkali-free flooding system in high temperature high-content wax oil reservoir
In the water of temperature 92.4 DEG C, salinity 8730mg/L, record the ultra low interfacial tension forming 0.002mN/m between crude oil that this flooding system and wax content are 21.3wt%, the TX500 type that interfacial tension is produced by Texas ,Usa university rotates and drips interfacial tensimeter and measure.Be 30 centimetres in length, diameter is 2.5 centimetres, and rate of permeation is 1.5 microns
2rock core on carry out imitation oil displacement experiment test.Elder generation is 8730mg/L with total mineralization, water type is NaHCO
3the oilfield injection water of type is saturated by rock core, measure the volume of voids (PV) of rock core, then carry out saturated with the dewatered oil of high-content wax, imitation oil displacement experiment test is carried out: first water drive is to moisture 92% at the temperature of 92.4 DEG C, metaideophone 0.3 PV(rock pore volume) after alkali-free flooding system, water drive is to moisture 100% again, records and can improve oil recovery factor 19.4% again on water drive basis.
[embodiment 7]
(1) triacontanoic acid amide sulfo betaine tensio-active agent (R
4=C
29, R
5=C
2, R
6=C
3) preparation
By the Long carbon chain triacontanoic acid methyl esters of 0.5 mole and the amidation reagent N of aequum, N-dimethyl-ethylenediamine adds in reactor, 155 DEG C of reactions 10 hours, open vacuum pump, extract methyl alcohol and excessive N, the N-dimethyl-ethylenediamine of reaction generation, obtain triacontanoic acid acyl group tertiary amine product, add the 3-chlorine-2-hydroxyl-propanesulfonate of aequum again, in 70 DEG C of reactions 12 hours, after dehydrated alcohol recrystallization is purified, obtain Long carbon chain beet alkali surface activator; Wherein, triacontanoic acid methyl esters: N, N-dimethyl-ethylenediamine: the mol ratio of 3-chlorine-2-hydroxyl-propanesulfonate is 1:2:1.5.
(2) preparation of the alkali-free flooding system of high temperature high-content wax oil reservoir is applicable to
" palmitic amide carboxyl betaine surfactant " is changed into " triacontanoic acid amide sulfo betaine tensio-active agent, all the other are with embodiment 1.
(3) application of alkali-free flooding system in high temperature high-content wax oil reservoir
In the water of temperature 92.4 DEG C, salinity 8730mg/L, record the ultra low interfacial tension forming 0.003mN/m between crude oil that this flooding system and wax content are 21.3wt%, the TX500 type that interfacial tension is produced by Texas ,Usa university rotates and drips interfacial tensimeter and measure.Be 30 centimetres in length, diameter is 2.5 centimetres, and rate of permeation is 1.5 microns
2rock core on carry out imitation oil displacement experiment test.Elder generation is 8730mg/L with total mineralization, water type is NaHCO
3the oilfield injection water of type is saturated by rock core, measure the volume of voids (PV) of rock core, then carry out saturated with the dewatered oil of high-content wax, imitation oil displacement experiment test is carried out: first water drive is to moisture 92% at the temperature of 92.4 DEG C, metaideophone 0.3 PV(rock pore volume) after alkali-free flooding system, water drive is to moisture 100% again, records and can improve oil recovery factor 19.3% again on water drive basis.
[embodiment 8]
(1) erucicamide sulfobetaine surfactant (R
4=C
21, R
5=C
3, R
6=C
2) preparation
By the amidation reagent N of the methyl erucate of 0.5 mole and aequum, N-dimethylated propyl diethylenetriamine adds in reactor, 145 DEG C of reactions 10 hours, open vacuum pump, extract methyl alcohol and excessive N, the N-dimethylated propyl diethylenetriamine of reaction generation, obtain erucic acid acyl group tertiary amine product, add the 2-bromotrifluoromethane sodium sulfonate of aequum again, in 85 DEG C of reactions 14 hours, after dehydrated alcohol recrystallization is purified, obtain Long carbon chain beet alkali surface activator; Wherein, methyl erucate: N, N-dimethylated propyl diethylenetriamine: the mol ratio of 2-bromotrifluoromethane sodium sulfonate is 1:2.5:2.0.
(2) preparation of the alkali-free flooding system of high temperature high-content wax oil reservoir is applicable to
" palmitic amide carboxyl betaine surfactant " is changed into " erucicamide sulfobetaine surfactant ", and all the other are the same.
(3) application of alkali-free flooding system in high temperature high-content wax oil reservoir
In the water of temperature 92.4 DEG C, salinity 8730mg/L, record the ultra low interfacial tension forming 0.0001mN/m between crude oil that this flooding system and wax content are 21.3wt%, the TX500 type that interfacial tension is produced by Texas ,Usa university rotates and drips interfacial tensimeter and measure.Be 30 centimetres in length, diameter is 2.5 centimetres, and rate of permeation is 1.5 microns
2rock core on carry out imitation oil displacement experiment test.Elder generation is 8730mg/L with total mineralization, water type is NaHCO
3the oilfield injection water of type is saturated by rock core, measure the volume of voids (PV) of rock core, then carry out saturated with the dewatered oil of high-content wax, imitation oil displacement experiment test is carried out: first water drive is to moisture 92% at the temperature of 92.4 DEG C, metaideophone 0.3 PV(rock pore volume) after alkali-free flooding system, water drive is to moisture 100% again, records and can improve oil recovery factor 21.9% again on water drive basis.
[embodiment 9]
(1) n-nonanoic acid amido carboxyl beet alkali surface activator (R
1=C
8, R
2=C
3, R
3=C
1) preparation
By the amidation reagent N of the methyl pelargonate of 0.5 mole and aequum, N-dimethylated propyl diethylenetriamine adds in reactor, 135 DEG C of reactions 10 hours, open vacuum pump, extract methyl alcohol and excessive N, the N-dimethylated propyl diethylenetriamine of reaction generation, obtain n-nonanoic acid acyl group tertiary amine product, add the sodium chloroacetate of aequum again, in 75 DEG C of reactions 9 hours, after purifying with dehydrated alcohol recrystallization, obtain Long carbon chain beet alkali surface activator; Wherein, methyl pelargonate: N, N-dimethylated propyl diethylenetriamine: the mol ratio of sodium chloroacetate is 1:2.5:1.5.
(2) preparation of the alkali-free flooding system of high temperature high-content wax oil reservoir is applicable to
By the erucicamide carboxyl betaine surfactant in obtained nonyl amido carboxyl beet alkali surface activator, embodiment 2, viscosity-average molecular weight be 4,000 ten thousand super high molecular weight polyacrylamide and salinity be that the oilfield injection water of 8730mg/L stirs, obtain required flooding system, by percentage to the quality, the proportioning of erucicamide carboxyl betaine surfactant, super high molecular weight polyacrylamide and oilfield injection water in nonyl amido carboxyl beet alkali surface activator, embodiment 2 is 0.06wt%:0.24wt%:0.15wt%:99.55wt%.
(3) application of alkali-free flooding system in high temperature high-content wax oil reservoir
Under the oilfield injection water condition of temperature 92.4 DEG C, salinity 8730mg/L, record this flooding system and wax content is the ultra low interfacial tension forming 0.00008mN/m between 21.3wt% crude oil, the TX500 type that interfacial tension is produced by Texas ,Usa university rotates and drips interfacial tensimeter and measure.Be 30 centimetres in length, diameter is 2.5 centimetres, and rate of permeation is 1.5 microns
2rock core on carry out imitation oil displacement experiment test.Elder generation is 8730mg/L with total mineralization, water type is NaHCO
3the oilfield injection water of type is saturated by rock core, measure the volume of voids (PV) of rock core, then carry out saturated with the dewatered oil of high-content wax, imitation oil displacement experiment test is carried out at the temperature of 92.4 DEG C, first water drive is to moisture 92%, metaideophone 0.3 PV(rock pore volume) after alkali-free flooding system, then water drive is to moisture 100%, records and can improve oil recovery factor 23.5% again on water drive basis.
[embodiment 10]
(1) capric acid acidamide sulfobetaine surfactant (R
4=C
9, R
5=C
3, R
6=C
2) preparation
By the amidation reagent N of the methyl caprate of 0.5 mole and aequum, N-dimethylated propyl diethylenetriamine adds in reactor, 140 DEG C of reactions 9 hours, open vacuum pump, extract methyl alcohol and excessive N, the N-dimethylated propyl diethylenetriamine of reaction generation, obtain capric acid acyl group tertiary amine product, add the 2-bromotrifluoromethane sodium sulfonate of aequum again, in 85 DEG C of reactions 14 hours, after dehydrated alcohol recrystallization is purified, obtain Long carbon chain beet alkali surface activator; Wherein, methyl caprate: N, N-dimethylated propyl diethylenetriamine: the mol ratio of 2-bromotrifluoromethane sodium sulfonate is 1:2.5:2.0.
(2) preparation of the alkali-free flooding system of high temperature high-content wax oil reservoir is applicable to
By the erucicamide sulfobetaine surfactant in obtained capric acid acidamide sulfobetaine surfactant, embodiment 8, viscosity-average molecular weight be 4,000 ten thousand super high molecular weight polyacrylamide and salinity be that the oilfield injection water of 8730mg/L stirs, obtain required flooding system, by percentage to the quality, the proportioning of erucicamide sulfobetaine surfactant, super high molecular weight polyacrylamide and oilfield injection water in capric acid acidamide sulfobetaine surfactant, embodiment 8 is 0.05wt%:0.25wt%:0.15wt%:99.55wt%.
(3) application of alkali-free flooding system in high temperature high-content wax oil reservoir
In the water of temperature 92.4 DEG C, salinity 8730mg/L, record this flooding system and wax content is the ultra low interfacial tension forming 0.0001mN/m between 21.3wt% crude oil, the TX500 type that interfacial tension is produced by Texas ,Usa university rotates and drips interfacial tensimeter and measure.Be 30 centimetres in length, diameter is 2.5 centimetres, and rate of permeation is 1.5 microns
2rock core on carry out imitation oil displacement experiment test.Elder generation is 8730mg/L with total mineralization, water type is NaHCO
3the oilfield injection water of type is saturated by rock core, measure the volume of voids (PV) of rock core, then carry out saturated with the dewatered oil of high-content wax, imitation oil displacement experiment test is carried out: first water drive is to moisture 92% at the temperature of 92.4 DEG C, metaideophone 0.3 PV(rock pore volume) after alkali-free flooding system, water drive is to moisture 100% again, records and can improve oil recovery factor 23.9% again on water drive basis.
[embodiment 11]
By the erucicamide carboxyl betaine surfactant in embodiment 2, erucicamide sulfobetaine surfactant in embodiment 8, viscosity-average molecular weight be 4,000 ten thousand super high molecular weight polyacrylamide and salinity be that the oilfield injection water of 8730mg/L stirs, obtain required flooding system, by percentage to the quality, erucicamide carboxyl betaine surfactant in embodiment 2, erucicamide sulfobetaine surfactant in embodiment 8, the proportioning of super high molecular weight polyacrylamide and oilfield injection water is 0.15wt%:0.15wt%:0.15wt%:99.55wt%.
In the water of temperature 92.4 DEG C, salinity 8730mg/L, record this flooding system and wax content is the ultra low interfacial tension forming 0.0001mN/m between 21.3wt% crude oil, the TX500 type that interfacial tension is produced by Texas ,Usa university rotates and drips interfacial tensimeter and measure.Be 30 centimetres in length, diameter is 2.5 centimetres, and rate of permeation is 1.5 microns
2rock core on carry out imitation oil displacement experiment test.Elder generation is 8730mg/L with total mineralization, water type is NaHCO
3the oilfield injection water of type is saturated by rock core, measure the volume of voids (PV) of rock core, then carry out saturated with the dewatered oil of high-content wax, imitation oil displacement experiment test is carried out: first water drive is to moisture 92% at the temperature of 92.4 DEG C, metaideophone 0.3 PV(rock pore volume) after alkali-free flooding system, water drive is to moisture 100% again, records and can improve oil recovery factor 23.8% again on water drive basis.
[embodiment 12]
By the erucicamide carboxyl betaine surfactant in embodiment 2, viscosity-average molecular weight be 2,500 ten thousand super high molecular weight polyacrylamide and salinity be that the oilfield injection water of 8730mg/L stirs, obtain required flooding system, by percentage to the quality, the proportioning of erucicamide carboxyl betaine surfactant, super high molecular weight polyacrylamide and oilfield injection water in embodiment 2 is 0.1wt%:0.2wt%:99.7wt%.
In the water of temperature 92.4 DEG C, salinity 8730mg/L, record this flooding system and wax content is the ultra low interfacial tension forming 0.0001mN/m between 21.3wt% crude oil, the TX500 type that interfacial tension is produced by Texas ,Usa university rotates and drips interfacial tensimeter and measure.Be 30 centimetres in length, diameter is 2.5 centimetres, and rate of permeation is 1.5 microns
2rock core on carry out imitation oil displacement experiment test.Elder generation is 8730mg/L with total mineralization, water type is NaHCO
3the oilfield injection water of type is saturated by rock core, measure the volume of voids (PV) of rock core, then carry out saturated with the dewatered oil of high-content wax, imitation oil displacement experiment test is carried out: first water drive is to moisture 92% at the temperature of 92.4 DEG C, metaideophone 0.3 PV(rock pore volume) after alkali-free flooding system, water drive is to moisture 100% again, records and can improve oil recovery factor 23.2% again on water drive basis.
[embodiment 13]
By the erucicamide carboxyl betaine surfactant in embodiment 2, viscosity-average molecular weight be 3,000 ten thousand super high molecular weight polyacrylamide and salinity be that the oilfield injection water of 8730mg/L stirs, obtain required flooding system, by percentage to the quality, the proportioning of erucicamide carboxyl betaine surfactant, super high molecular weight polyacrylamide and oilfield injection water in embodiment 2 is 1.0wt%:0.2wt%:98.8wt%.
In the water of temperature 92.4 DEG C, salinity 8730mg/L, record this flooding system and wax content is the ultra low interfacial tension forming 0.0001mN/m between 21.3wt% crude oil, the TX500 type that interfacial tension is produced by Texas ,Usa university rotates and drips interfacial tensimeter and measure.Be 30 centimetres in length, diameter is 2.5 centimetres, and rate of permeation is 1.5 microns
2rock core on carry out imitation oil displacement experiment test.Elder generation is 8730mg/L with total mineralization, water type is NaHCO
3the oilfield injection water of type is saturated by rock core, measure the volume of voids (PV) of rock core, then carry out saturated with the dewatered oil of high-content wax, imitation oil displacement experiment test is carried out: first water drive is to moisture 92% at the temperature of 92.4 DEG C, metaideophone 0.3 PV(rock pore volume) after alkali-free flooding system, water drive is to moisture 100% again, records and can improve oil recovery factor 24.6% again on water drive basis.
[comparative example 1]
Get dodecane phenol polyethenoxy ether (6) hydroxypropyl azochlorosulfonate acid sodium trimethyl-glycine, super high molecular weight polyacrylamide (molecular weight is 3,000 ten thousand) and Henan Oil Field injection water to stir, obtain required flooding system, by percentage to the quality, dodecane phenol polyethenoxy ether (6) hydroxypropyl azochlorosulfonate acid sodium beet alkali surface activator, super high molecular weight polyacrylamide and Henan Oil Field inject the proportioning of water is 0.3%:0.15%:99.55%.
In the water of temperature 92.4 DEG C, salinity 8730mg/L, record this flooding system and wax content is the interfacial tension forming 0.037mN/m between 21.3wt% crude oil, the TX500 type that interfacial tension is produced by Texas ,Usa university rotates and drips interfacial tensimeter and measure.Be 30 centimetres by this system in length, diameter is 2.5 centimetres, and rate of permeation is that the rock core of 1.5 micron 2 carries out imitation oil displacement experiment test.Elder generation is 8730mg/L with total mineralization, water type is NaHCO
3the oilfield injection water of type is saturated by rock core, measure the volume of voids (PV) of rock core, then carry out saturated with the dewatered oil of high-content wax, imitation oil displacement experiment test is carried out: first water drive is to moisture 92% at the temperature of 92.4 DEG C, metaideophone 0.3 PV(rock pore volume) after alkali-free flooding system, water drive is to moisture 100% again, records and can improve oil recovery factor 12.4% again on water drive basis.
[comparative example 2]
Get dodecane phenol polyethenoxy ether (5) sodium acetate trimethyl-glycine, super high molecular weight polyacrylamide (molecular weight is 3,000 ten thousand) and Henan Oil Field injection water to stir, obtain required flooding system, by percentage to the quality, dodecane phenol polyethenoxy ether (5) sodium acetate beet alkali surface activator, super high molecular weight polyacrylamide and Henan Oil Field inject the proportioning of water is 0.3%:0.15%:99.55%.
In the water of temperature 92.4 DEG C, salinity 8730mg/L, record this flooding system and wax content is the interfacial tension forming 0.052mN/m between 21.3wt% crude oil, the TX500 type that interfacial tension is produced by Texas ,Usa university rotates and drips interfacial tensimeter and measure.Be 30 centimetres by this system in length, diameter is 2.5 centimetres, and rate of permeation is that the rock core of 1.5 micron 2 carries out imitation oil displacement experiment test.Elder generation is 8730mg/L with total mineralization, water type is NaHCO
3the oilfield injection water of type is saturated by rock core, measure the volume of voids (PV) of rock core, then carry out saturated with the dewatered oil of high-content wax, imitation oil displacement experiment test is carried out: first water drive is to moisture 92% at the temperature of 92.4 DEG C, metaideophone 0.3 PV(rock pore volume) after alkali-free flooding system, water drive is to moisture 100% again, records and can improve oil recovery factor 10.9% again on water drive basis.
[comparative example 3]
(1) n-nonanoic acid amido carboxyl beet alkali surface activator (R
1=C
8, R
2=C
3, R
3=C
2) preparation
By the amidation reagent N of the methyl pelargonate of 0.5 mole and aequum, N-dimethylated propyl diethylenetriamine adds in reactor, 145 DEG C of reactions 7 hours, open vacuum pump, extract methyl alcohol and excessive N, the N-dimethylated propyl diethylenetriamine of reaction generation, obtain n-nonanoic acid acyl group tertiary amine product, add the β-chloropropionic acid sodium of aequum again, in 75 DEG C of reactions 10 hours, after dehydrated alcohol recrystallization is purified, obtain Long carbon chain beet alkali surface activator; Wherein, the mol ratio of methyl pelargonate: N, N-dimethylated propyl diethylenetriamine: β-chloropropionic acid sodium is 1:2:1.6.
(2) preparation of the alkali-free flooding system of high temperature high-content wax oil reservoir is applicable to
" palmitic amide carboxyl betaine surfactant " changed into " n-nonanoic acid amido carboxyl beet alkali surface activator ", all the other are with embodiment 1.
(3) application of alkali-free flooding system in high temperature high-content wax oil reservoir
In the water of temperature 92.4 DEG C, salinity 8730mg/L, record the ultra low interfacial tension forming 0.053mN/m between crude oil that this flooding system and wax content are 21.3wt%, the TX500 type that interfacial tension is produced by Texas ,Usa university rotates and drips interfacial tensimeter and measure.Be 30 centimetres in length, diameter is 2.5 centimetres, and rate of permeation is 1.5 microns
2rock core on carry out imitation oil displacement experiment test.Elder generation is 8730mg/L with total mineralization, water type is NaHCO
3the oilfield injection water of type is saturated by rock core, measure the volume of voids (PV) of rock core, then carry out saturated with the dewatered oil of high-content wax, imitation oil displacement experiment test is carried out at the temperature of 92.4 DEG C, first water drive is to moisture 92%, metaideophone 0.3 PV(rock pore volume) after alkali-free flooding system, then water drive is to moisture 100%, records and can improve oil recovery factor 10.7% again on water drive basis.
[comparative example 4]
(1) capric acid acidamide sulfobetaine surfactant (R
4=C
9, R
5=C
3, R
6=C
2) preparation
By the amidation reagent N of the methyl caprate of 0.5 mole and aequum, N-dimethylated propyl diethylenetriamine adds in reactor, 145 DEG C of reactions 10 hours, open vacuum pump, extract methyl alcohol and excessive N, the N-dimethylated propyl diethylenetriamine of reaction generation, obtain capric acid acyl group tertiary amine product, add the 2-bromotrifluoromethane sodium sulfonate of aequum again, in 85 DEG C of reactions 14 hours, after dehydrated alcohol recrystallization is purified, obtain Long carbon chain beet alkali surface activator; Wherein, methyl caprate: N, N-dimethylated propyl diethylenetriamine: the mol ratio of 2-bromotrifluoromethane sodium sulfonate is 1:2.5:2.0.
(2) preparation of the alkali-free flooding system of high temperature high-content wax oil reservoir is applicable to
" palmitic amide carboxyl betaine surfactant " is changed into " capric acid acidamide sulfobetaine surfactant ", and all the other are the same.
(3) application of alkali-free flooding system in high temperature high-content wax oil reservoir
In the water of temperature 92.4 DEG C, salinity 8730mg/L, record the ultra low interfacial tension forming 0.042mN/m between crude oil that this flooding system and wax content are 21.3wt%, the TX500 type that interfacial tension is produced by Texas ,Usa university rotates and drips interfacial tensimeter and measure.Be 30 centimetres in length, diameter is 2.5 centimetres, and rate of permeation is 1.5 microns
2rock core on carry out imitation oil displacement experiment test.Elder generation is 8730mg/L with total mineralization, water type is NaHCO
3the oilfield injection water of type is saturated by rock core, measure the volume of voids (PV) of rock core, then carry out saturated with the dewatered oil of high-content wax, imitation oil displacement experiment test is carried out: first water drive is to moisture 92% at the temperature of 92.4 DEG C, metaideophone 0.3 PV(rock pore volume) after alkali-free flooding system, water drive is to moisture 100% again, records and can improve oil recovery factor 11.8% again on water drive basis.
The present inventor finds through great many of experiments, and Long carbon chain beet alkali surface activator of the present invention is R
1for C
15~ C
39long carbon chain carboxylate salt trimethyl-glycine, and described alkali-free flooding system also comprises as shown in the formula (I) but R
1for C
8~ C
12short carbon chain carboxylate salt trimethyl-glycine time, between Long carbon chain carboxylate salt trimethyl-glycine and short carbon chain carboxylate salt trimethyl-glycine produce synergy, such as can find out from the data of embodiment 9, embodiment 2 and comparative example 3.Similarly Long carbon chain beet alkali surface activator of the present invention is R
1for C
15~ C
39long carbon chain sulphonate betaine, and described alkali-free flooding system also comprises as shown in the formula (II) but R
1for C
8~ C
12short carbon chain sulphonate betaine time, have synergy between Long carbon chain sulphonate betaine and short carbon chain sulphonate betaine, this also can find out from the data of embodiment 10, embodiment 8 and comparative example 4.In addition, when described long-chain trimethyl-glycine is made up of with Long carbon chain sulphonate betaine Long carbon chain carboxylate salt trimethyl-glycine than only by Long carbon chain carboxylate salt trimethyl-glycine or the better effects if only using Long carbon chain sulphonate betaine, such as, can find out from the data of embodiment 11, embodiment 2 and embodiment 8.
1(is continued for table) the different flooding systems that are applicable to high temperature high-content wax oil reservoir improve oil recovery factor test-results
Note: the number in table is weight part; PAM: polyacrylamide.
Table 1(continues) the different flooding systems that are applicable to high temperature high-content wax oil reservoir improve oil recovery factor test-results
Claims (10)
1. an alkali-free flooding system for applicable high temperature high-content wax oil reservoir, comprises following component in mass parts:
(1) Long carbon chain beet alkali surface activator 0.01 ~ 5.0 part;
(2) 0.01 ~ 3.0 part, polymkeric substance;
(3) 92.0 ~ 99.98 parts, water;
Wherein, Long carbon chain beet alkali surface activator is selected from least one in long-chain carboxylic acid's betaine salt, sulphonate betaine, and its general molecular formula is respectively such as formula shown in (I) and formula (II):
Formula (I)
Formula (II)
Described R
1and R
4independently be selected from C
15~ C
29alkyl, any one in thiazolinyl; Described R
2and R
5independently be selected from C
2~ C
5alkylidene group, any one in hydroxyl substituted alkylene; Described R
3and R
6independently be selected from C
1~ C
5alkylidene group, any one in hydroxyl substituted alkylene; Described polymkeric substance is selected from least one in super high molecular weight polyacrylamide, Heat Resistant and Salt Tolerant Polymer or xanthan gum; Described wet concentration is from oilfield injection water.
2. the alkali-free flooding system of applicable high temperature high-content wax oil reservoir according to claim 1, is characterized in that R in described Long carbon chain beet alkali surface activator
1, R
4for C
17~ C
25alkyl or alkenyl in any one, R
2, R
5for C
2~ C
3alkylidene group or hydroxyl substituted alkylene in any one, R
3, R
6for C
1~ C
3alkylidene group.
3. the alkali-free flooding system of applicable high temperature high-content wax oil reservoir according to claim 2, is characterized in that R in described Long carbon chain beet alkali surface activator
1, R
4for C
21alkyl or alkenyl in any one, R
2, R
5for C
3alkylidene group or hydroxyl substituted alkylene in any one, R
3for C
1alkylidene group, R
6for C
2alkylidene group.
4. the alkali-free flooding system of applicable high temperature high-content wax oil reservoir according to claim 1, is characterized in that the viscosity-average molecular weight of described super high molecular weight polyacrylamide is 2,500 ten thousand ~ 4,000 ten thousand.
5. the alkali-free flooding system of applicable high temperature high-content wax oil reservoir according to claim 1, is characterized in that described Long carbon chain beet alkali surface activator is R
1for C
15~ C
29long carbon chain carboxylate salt trimethyl-glycine, described alkali-free flooding system also comprises as shown in the formula (I) but R
1for C
8~ C
12short carbon chain carboxylate salt trimethyl-glycine.
6. the alkali-free flooding system of applicable high temperature high-content wax oil reservoir according to claim 1, is characterized in that described Long carbon chain beet alkali surface activator is R
1for C
15~ C
29long carbon chain sulphonate betaine, described alkali-free flooding system also comprises as shown in the formula (II) but R
1for C
8~ C
12short carbon chain sulphonate betaine.
7. the alkali-free flooding system of applicable high temperature high-content wax oil reservoir according to claim 1, is characterized in that described Long carbon chain trimethyl-glycine is made up of Long carbon chain carboxylate salt trimethyl-glycine and Long carbon chain sulphonate betaine.
8. the alkali-free flooding system of applicable high temperature high-content wax oil reservoir according to claim 1, is characterized in that the Long carbon chain beet alkali surface activator described in formula (I) is obtained by following methods: by Long carbon chain fatty acid methyl ester R
1cOOCH
3with required amidation reagent NH
2r
2n (CH
3)
2in 100 ~ 160 DEG C of reactions 3 ~ 20 hours; Then add carboxylating reagent XR
3cOOM continues reaction 2 ~ 20 hours in 50 ~ 100 DEG C, obtains the Long carbon chain beet alkali surface activator described in formula (I); Wherein, Long carbon chain fatty acid methyl ester: amidation reagent: the mol ratio of carboxylating reagent is 1:(1 ~ 3): (1 ~ 4); X is selected from Br or Cl, and M is selected from K or Na.
9. the alkali-free flooding system of applicable high temperature high-content wax oil reservoir according to claim 1, is characterized in that the Long carbon chain beet alkali surface activator described in formula (II) is obtained by following methods: by Long carbon chain fatty acid methyl ester R
4cOOCH
3with required amidation reagent NH
2r
5n (CH
3)
2in 100 ~ 160 DEG C of reactions 3 ~ 20 hours; Then add sulfonated reagent XR
6sO
3m continues reaction 2 ~ 20 hours in 50 ~ 100 DEG C, obtains the Long carbon chain beet alkali surface activator described in formula (I); Wherein, Long carbon chain fatty acid methyl ester: amidation reagent: sulfonated reagent mol ratio is 1:(1 ~ 3): (1 ~ 4); X is selected from Br or Cl, and M is selected from K or Na.
10. the application of alkali-free flooding system according to any one of claim 1 to 9 in high temperature high-content wax oil reservoir oil displacement.
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