CN113897190B - Surfactant for improving water injection efficiency of low-permeability reservoir and preparation method and application thereof - Google Patents

Surfactant for improving water injection efficiency of low-permeability reservoir and preparation method and application thereof Download PDF

Info

Publication number
CN113897190B
CN113897190B CN202111502313.3A CN202111502313A CN113897190B CN 113897190 B CN113897190 B CN 113897190B CN 202111502313 A CN202111502313 A CN 202111502313A CN 113897190 B CN113897190 B CN 113897190B
Authority
CN
China
Prior art keywords
surfactant
carbon atoms
formula
parts
water injection
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202111502313.3A
Other languages
Chinese (zh)
Other versions
CN113897190A (en
Inventor
崔仕章
宋新旺
肖盼
郭鑫
马丽
杨金兴
黄琦活
房吉涛
栾翔
童鲁浩
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Deshi Energy Technology Group Co Ltd
Shandong Deshi Chemical Co Ltd
Original Assignee
Deshi Energy Technology Group Co Ltd
Shandong Deshi Chemical Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Deshi Energy Technology Group Co Ltd, Shandong Deshi Chemical Co Ltd filed Critical Deshi Energy Technology Group Co Ltd
Priority to CN202111502313.3A priority Critical patent/CN113897190B/en
Publication of CN113897190A publication Critical patent/CN113897190A/en
Application granted granted Critical
Publication of CN113897190B publication Critical patent/CN113897190B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • 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
    • C09K8/584—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
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
    • C09K8/524—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning organic depositions, e.g. paraffins or asphaltenes
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
    • C09K8/528—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning inorganic depositions, e.g. sulfates or carbonates
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/60—Compositions for stimulating production by acting on the underground formation
    • C09K8/602—Compositions for stimulating production by acting on the underground formation containing surfactants
    • C09K8/604—Polymeric surfactants
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
    • E21B43/20—Displacing by water

Abstract

The application discloses a surfactant for improving the water injection efficiency of a low-permeability reservoir, a preparation method and application, and belongs to the technical field of surfactants for oil and gas field exploitation. The surfactant comprises the following components in parts by weight: 1-5 parts of nonionic surfactant and 25-50 parts of cationic surfactant. The surfactant can effectively reduce the water injection pressure of a water injection well, avoid the increase of the water injection pressure caused by a large amount of emulsification on crude oil, improve the water injection capability of the water injection well, change the wettability of rocks, reduce capillary pressure and inhibit the damage of carbonate precipitates such as calcium carbonate and the like to a stratum; meanwhile, the oil-water interfacial tension can be effectively reduced, the surface property is excellent, and the crude oil recovery rate is favorably improved.

Description

Surfactant for improving water injection efficiency of low-permeability reservoir and preparation method and application thereof
Technical Field
The application relates to a surfactant for improving the water injection efficiency of a low-permeability reservoir, a preparation method and application, and belongs to the technical field of surfactants for oil and gas field exploitation.
Background
The low-permeability oil reservoir refers to an oil reservoir with low oil reservoir permeability, low abundance and low single-well productivity. In the ascertained reserves of the oil reservoir, the proportion of the reserves of the low-permeability oil reservoir is very high, which accounts for about 2/3 of the reserves in China and reaches more than 50 hundred million tons, so that the low-permeability oil reservoir has important significance in the oil development in China and has great development potential. Compared with medium-high permeability reservoirs, the low-permeability reservoir has the characteristics of low permeability, small porosity, various and high content of clay minerals, compact lithology, poor water injection quality (high mineralization degree, high calcium and magnesium) and the like, the problems of high water injection pressure, low injection rate, insufficient water injection quantity and the like of the reservoir are easily caused, the oil layer is further damaged due to secondary water pollution, the conventional fracturing and acidizing technology can play a certain role in the transformation of the low-permeability reservoir, but the action range and time are limited, and the surfactant pressure-reducing and injection-increasing technology is more and more concerned with the unique superiority.
The main mechanism of injecting proper surfactant is to reduce the adhesion of crude oil on the rock surface, change the wettability of rock surface, reduce the seepage resistance, improve the two-phase seepage capability and improve the water injection capability of water well by reducing the interfacial tension between oil, water and rock, and simultaneously the surfactant can clean part of oil stains adhered on the wall surface of well casing and the surface of rock stratum, thereby enlarging the seepage channel and realizing the normal water injection of water well. However, because of many factors influencing the development effect of water injection, the currently used chemical system has single performance, large use concentration, high cost and poor infiltration and absorption, and often cannot achieve satisfactory effect.
Disclosure of Invention
In order to solve the problems, the surfactant for improving the water injection efficiency of the low-permeability reservoir and the preparation method and application thereof are provided, the surfactant can effectively reduce the water injection pressure of a water injection well, avoid the increase of the water injection pressure caused by a large amount of emulsification on crude oil, improve the water injection capacity of the water injection well, change the wettability of rocks, reduce capillary pressure and inhibit the damage of carbonate precipitates such as calcium carbonate to a stratum; meanwhile, the oil-water interfacial tension can be effectively reduced, the surface property is excellent, and the crude oil recovery rate is favorably improved.
According to one aspect of the application, a surfactant for improving the water injection efficiency of a low-permeability reservoir is provided, and comprises the following components in parts by weight: 1-5 parts of nonionic surfactant, 25-50 parts of cationic surfactant,
wherein the molecular formula of the nonionic surfactant is shown as formula I:
Figure DEST_PATH_IMAGE001
the compound has a structure shown in a formula I,
the R is1、R2、R4、R6Independently selected from one of linear or branched hydrocarbon groups containing 1 to 5 carbon atoms, and R is3、R5Independently selected from one of straight chain or branched chain hydrocarbon groups containing 6 carbon atoms to 20 carbon atoms, and m and n are independently selected from integers between 1 and 20;
the molecular formula of the cationic surfactant is shown as a formula II:
Figure 552192DEST_PATH_IMAGE002
the compound of the formula II is shown in the specification,
the R is7、R8Independently selected from one of linear or branched hydrocarbon groups containing 1 to 5 carbon atoms, and R is9、R11Independently selected from one of linear alkyl containing 1 to 3 carbon atoms, R10Selected from linear or branched chains containing from 1 to 20 carbon atomsAnd X is Cl or Br.
Optionally, the surfactant further comprises 0.01-10 parts by weight of a high molecular surfactant, and the molecular formula of the high molecular surfactant is shown as formula III:
Figure DEST_PATH_IMAGE003
in the formula (III), the reaction is carried out,
wherein, R is12One selected from alkyl, cycloalkyl, alkenyl or aryl with straight chain or branched chain containing 8 to 20 carbon atoms, and R is13One selected from methyl, ethyl and propyl, and R is14One selected from linear alkyl containing 0-5 carbon atoms, M is selected from one of sulfate, carboxylate and sulfonate, and p and q are independently selected from integers between 1 and 500.
Alternatively, the R is12One selected from alkyl, cycloalkyl, alkenyl or aryl with straight chain or branched chain containing 8 to 18 carbon atoms, wherein R is13Is methyl, said R14One selected from straight chain alkyl containing 0-3 carbon atoms, p and q are independently selected from integers between 1-50, and M is one of sodium salt, potassium salt and ammonium salt;
more preferably, R is12Is an alkyl group having 12 carbon atoms, said R14Is a hydrocarbon group containing 0 carbon atom, p is 30, q is 30, M is-SO3Na。
Alternatively, in formula I, R1、R2、R4、R6Are all ethyl, said R3、R5Independently selected from one of straight chain or branched chain hydrocarbon groups containing 8 carbon atoms to 12 carbon atoms, and m and n are independently selected from integers between 1 and 20;
preferably, said R is3、R5The same, m and n are the same;
more preferably, R is3、R5All contain 10 carbon atomsAnd m and n are 10.
Alternatively, in formula II, R7One selected from the group consisting of linear or branched hydrocarbon groups having 1 to 3 carbon atoms, and R8One selected from the group consisting of linear or branched hydrocarbon groups having 3 to 5 carbon atoms, and R9、R11Same as R in the formula10And one selected from linear or branched hydrocarbon groups having 1 to 15 carbon atoms, wherein X is Cl or Br.
Preferably, said R is7Is methyl, said R8Is n-butyl, the R9、R11Are all methyl, said R10Is alkyl containing 12 carbon atoms, and X is Br;
alternatively, the synthetic route of the cationic surfactant is:
Figure 702551DEST_PATH_IMAGE004
；
preferably, dimethyl malonate and N, N-dimethyl-1, 4-butanediamine are used as raw materials to synthesize bis (4-dimethylaminobutyl) malonamide; and then carrying out quaternization reaction on the bis (4-dimethylaminobutyl) malonamide and bromododecane to obtain an amido-containing quaternary ammonium salt type gemini surfactant mixture, and recrystallizing with acetone to obtain the cationic surfactant.
Alternatively, the surfactant includes a solvent including 20 to 60 parts by weight of water and 0.01 to 10 parts by weight of a low molecular alcohol having 1 to 8 carbon atoms.
Preferably, the low molecular alcohol is at least one of ethanol, ethylene glycol and isopropanol, and more preferably ethanol.
Optionally, it comprises, in parts by weight: 2 parts of nonionic surfactant and 38 parts of cationic surfactant.
Preferably, the cleaning agent comprises 2 parts by weight of nonionic surfactant, 38 parts by weight of cationic surfactant, 5 parts by weight of high molecular surfactant, 40 parts by weight of water and 10 parts by weight of low molecular alcohol.
According to another aspect of the present application, there is provided a process for preparing the surfactant of any one of the above, comprising the steps of: and stirring the nonionic surfactant, the cationic surfactant and water at 20-50 ℃ for not less than 1h to prepare the surfactant.
Preferably, the method comprises the steps of: adding water into the reaction kettle under the condition of normal pressure, and stirring at the temperature of 30-40 ℃;
adding the high molecular surfactant into the reaction kettle, stirring for 1-3h, and uniformly mixing;
adding the nonionic surfactant and the cationic surfactant into the reaction kettle, stirring for 0.5-2h, and uniformly mixing;
adding the low molecular alcohol into the reaction kettle, stirring for 0.5-2h at the temperature of 30-40 ℃, and uniformly mixing to obtain the surfactant.
According to the application, the application of the surfactant prepared by any one of the methods in the previous step or the surfactant prepared by the method in the previous step in improving the water injection efficiency of a low-permeability oil reservoir with the permeability not higher than 50 x 10-3μm2。
Benefits of the present application include, but are not limited to:
1. according to the surfactant, the water injection pressure of a water injection well can be effectively reduced, the water injection pressure is prevented from being increased due to the fact that a large amount of crude oil is emulsified, the water injection capacity of the water injection well is improved, the wettability of rocks is changed, capillary pressure is reduced, and the damage of carbonate precipitates such as calcium carbonate to a stratum is inhibited; meanwhile, the oil-water interfacial tension can be effectively reduced, the surface property is excellent, and the crude oil recovery rate is favorably improved.
2. According to the surfactant, the gemini cationic surfactant is added, after the gemini cationic surfactant is injected into a stratum, the gemini cationic surfactant is adsorbed on the surface of a rock with a locally-dropped oil film by means of electrostatic interaction among ions, the adhesion of crude oil on the surface of the rock is reduced, the wettability of the surface of the rock is changed, the seepage resistance is reduced, the crude oil stripped from the surface of the rock is dispersed into small oil drops under the action of the surfactant, the flowing capability of the crude oil passing through a throat is improved, the permeability of a reservoir is improved, the stratum is dredged, the liquid supply capability of an oil well is restored, the normal water injection of a water well is realized, and the gemini cationic surfactant has the advantages of good biodegradability, low toxicity, high activity, strong hydrophobicity, good adsorbability on stratum minerals and the like; in addition, the existence of the carbonyl group has stronger electron withdrawing property, can reduce the consumption of formation cations to the surfactant, has good salt tolerance and can be used in the formation with larger mineralization degree; by adding the nonionic surfactant, the hydrophilicity of the surfactant system can be increased, and the strong interaction among the surfactants is weakened due to the steric effect, so that the phenomena of liquid crystallization, precipitation and the like of the surfactants are avoided, and the stability of the surfactant system is improved; in addition, by controlling the branched chain of the nonionic surfactant, the long-chain side group can form hydrophobic association in crude oil, so that the temperature resistance of the surfactant is improved, and the surfactant has high-temperature resistance.
3. According to the surfactant, the polymer surfactant is added, and the surface of the reservoir rock is provided with negative charges, so that the polymer surfactant can be adsorbed on the surface of the reservoir rock by virtue of electrostatic attraction to form an ultrathin membrane through self-assembly, an effective seepage channel is enlarged, the wettability of the surface of the rock is changed, the water injection friction resistance and the crude oil exploitation resistance are reduced, the near-end resistance reduction and injection increase of a water injection well can be realized, and the effect of far-end oil displacement and injection increase can be achieved.
4. The preparation method of the surfactant has the advantages of simple and environment-friendly steps and mild conditions, and is suitable for industrial production.
Detailed Description
The present application will be described in detail with reference to examples, but the present application is not limited to these examples.
Unless otherwise specified, the raw materials and catalysts in the examples of the present application were all purchased commercially.
EXAMPLE 1 surfactant 1#
(1) Taking 26.4g of dimethyl malonate and 46.4g N, N-dimethyl-1, 4-butanediamine as raw materials, adding 1.5g of sodium formate, reacting for 24 hours at 100 ℃, dropwise adding 2.5ml of acetic acid after complete reaction, stirring for 1 hour, cooling to obtain a light yellow solid, and drying in an oven at 105 ℃ to obtain a crude product of bis (4-dimethylaminobutyl) malonamide; weighing 29.6g of crude bis (4-dimethylaminobutyl) malonamide and 50.0g of bromododecane, reacting at 50 ℃ to obtain an amido-containing quaternary ammonium salt type gemini surfactant mixture, and recrystallizing with acetone to obtain the cationic surfactant 1 #.
(2) Adding 40.0g of water into the reaction kettle, adding 5.0g of high molecular surfactant while stirring at the temperature of 30-40 ℃, and stirring for 2 hours; then adding 2.0g of nonionic surfactant and 38.0g of cationic surfactant # 1, stirring for 1 hour, adding 10.0g of ethanol, continuing stirring for 1 hour, and uniformly mixing to obtain surfactant # 1;
wherein the molecular formula of the nonionic surfactant is as follows:
Figure 704005DEST_PATH_IMAGE005
，R1、R2、R4and R6Are all ethyl radicals, R3、R5Are both n-decaalkyl, and m and n are both 10;
the molecular formula of the high molecular surfactant is as follows:
Figure 434063DEST_PATH_IMAGE003
，R12is n-dodecyl radical, R13Is methyl, R14Is a hydrocarbon group having 0 carbon atom, M is-SO3 -P is 30 and q is 30.
Example 2 surfactant 2#
Example 2 differs from example 1 in that: in the step (2), 40.0g of water is added into the reaction kettle, 5.0g of high molecular surfactant is added into the reaction kettle while stirring at the temperature of 30-40 ℃, and the mixture is stirred for 2 hours; then adding 5.0g of nonionic surfactant and 35.0g of cationic surfactant # 1, stirring for 1 hour, adding 10.0g of ethanol, continuing stirring for 1 hour, and uniformly mixing to obtain surfactant # 2; the remaining conditions were the same as in example 1.
Example 3 surfactant 3#
Example 3 differs from example 1 in that: in the step (2), 40.0g of water is added into the reaction kettle, 2.0g of high molecular surfactant is added into the reaction kettle while stirring at the temperature of 30-40 ℃, and the mixture is stirred for 2 hours; then adding 5.0g of nonionic surfactant and 38.0g of cationic surfactant # 1, stirring for 1 hour, adding 10.0g of ethanol, continuing stirring for 1 hour, and uniformly mixing to obtain surfactant # 3; the remaining conditions were the same as in example 1.
Example 4 surfactant 4#
Example 4 differs from example 1 in that: in the step (2), adding 40.0g of water into a reaction kettle, adding 5.0g of nonionic surfactant and 40.0g of cationic surfactant 1# while stirring at the temperature of 30-40 ℃, adding 10.0g of ethanol after stirring for 1 hour, continuing stirring for 1 hour, and uniformly mixing to obtain surfactant 4 #; the remaining conditions were the same as in example 1.
Example 5 surfactant 5#
Example 5 differs from example 1 in that: adding 40.0g of water into the reaction kettle, adding 10.0g of high molecular surfactant while stirring at the temperature of 30-40 ℃, and stirring for 2 hours; then adding 2.0g of nonionic surfactant and 33.0g of cationic surfactant # 1, stirring for 1 hour, adding 10.0g of ethanol, continuing stirring for 1 hour, and uniformly mixing to obtain surfactant # 5; the remaining conditions were the same as in example 1.
Example 6 surfactant 6#
Example 6 differs from example 1 in that: in the step (2), 40.0g of water is added into the reaction kettle, 5.0g of high molecular surfactant is added into the reaction kettle while stirring at the temperature of 30-40 ℃, and the mixture is stirred for 2 hours; then adding 2.0g of nonionic surfactant and 38.0g of cationic surfactant # 1, stirring for 1 hour, adding 10.0g of ethanol, continuing stirring for 1 hour, and uniformly mixing to obtain surfactant # 6; the remaining conditions were the same as in example 1,
wherein the molecular formula of the nonionic surfactant is as follows:
Figure 650412DEST_PATH_IMAGE006
，R1、R2、R4and R6Are all ethyl radicals, R3、R5Are both n-decaalkyl, and m and n are both 10;
the molecular formula of the high molecular surfactant is as follows:
Figure 174935DEST_PATH_IMAGE007
，R12is n-dodecylphenyl, R13Is methyl, R14Is n-propyl, M is potassium carboxylate, i.e. -COO-P is 30 and q is 30.
Example 7 surfactant 7#
Example 7 differs from example 1 in that: in the step (2), 40.0g of water is added into the reaction kettle, 5.0g of high molecular surfactant is added into the reaction kettle while stirring at the temperature of 30-40 ℃, and the mixture is stirred for 2 hours; then adding 2.0g of nonionic surfactant and 38.0g of cationic surfactant # 1, stirring for 1 hour, adding 10.0g of ethanol, continuing stirring for 1 hour, and uniformly mixing to obtain surfactant # 7; the remaining conditions were the same as in example 1,
wherein the molecular formula of the nonionic surfactant is as follows:
Figure 460422DEST_PATH_IMAGE008
，R1is ethyl, R2Is ethyl, R3Is n-decaalkyl, R4Is n-propyl, R5Is n-octadecyl, R6Are all ethyl groups, m is 10, n is 10;
the molecular formula of the high molecular surfactant is as follows:
Figure 931855DEST_PATH_IMAGE009
，R12is n-dodecyl radical, R13Is methyl, R14To compriseA hydrocarbon group of 0 carbon atom, M is-SO3 -P is 30 and q is 30.
Example 8 surfactant 8#
Example 8 differs from example 1 in that: in the step (1), 34.8g of dimethyl adipate and 46.4g N, N-dimethyl-1, 4-butanediamine are used as raw materials, 1.5g of sodium formate is added to react for 24 hours at the temperature of 100 ℃, 2.5ml of acetic acid is dropwise added after the reaction is completed, the mixture is stirred for 1 hour, a light yellow solid is obtained by cooling, and the mixture is dried in an oven at the temperature of 105 ℃ to obtain a crude product of bis (4-dimethylaminobutyl) hexanediamide; 34.6g of crude bis (4-dimethylaminobutyl) hexanediamide is weighed to react with 50.0g of bromododecane at 50 ℃ to obtain an amido-containing quaternary ammonium salt type gemini surfactant mixture, and acetone is used for recrystallization to obtain the cationic surfactant 2 #.
In the step (2), 40.0g of water is added into the reaction kettle, 5.0g of high molecular surfactant is added into the reaction kettle while stirring at the temperature of 30-40 ℃, and the mixture is stirred for 2 hours; then adding 2.0g of nonionic surfactant and 38.0g of cationic surfactant No. 2, stirring for 1 hour, adding 10.0g of ethanol, continuing stirring for 1 hour, and uniformly mixing to obtain surfactant No. 8; the remaining conditions were the same as in example 1.
Example 9 surfactant 9#
Example 9 differs from example 1 in that: in the step (2), the molecular formula of the high molecular surfactant is as follows:
Figure 986399DEST_PATH_IMAGE010
，R15is n-dodecyl radical, R14Is n-propyl, M is-SO3 -X is 60, to obtain surfactant 9 #; the remaining conditions were the same as in example 1.
Comparative example 1 surfactant D1#
Comparative example 1 differs from example 1 in that: in the step (2), 40.0g of water is added into the reaction kettle, 6.0g of high molecular surfactant is added into the reaction kettle while stirring at the temperature of 30-40 ℃, and the mixture is stirred for 2 hours; adding 39.0g of cationic surfactant 1#, stirring for 1h, adding 10.0g of ethanol, continuing stirring for 1h, and uniformly mixing to obtain surfactant D1 #; the remaining conditions were the same as in example 1.
Comparative example 2 surfactant D2#
Comparative example 2 differs from example 1 in that: in the step (2), 40.0g of water is added into the reaction kettle, 19.0g of high molecular surfactant is added into the reaction kettle while stirring at the temperature of 30-40 ℃, and the mixture is stirred for 2 hours; adding 16.0g of nonionic surfactant and 10.0g of cationic surfactant # 1, stirring for 1 hour, adding 10.0g of ethanol, continuously stirring for 1 hour, and uniformly mixing to obtain surfactant D2 #; the remaining conditions were the same as in example 1.
Comparative example 3 surfactant D3#
Comparative example 3 differs from example 1 in that: in the step (2), the molecular formula of the nonionic surfactant is as follows:
Figure 963713DEST_PATH_IMAGE011
，R16is ethyl, R17Is n-decaalkyl, R18Is ethyl and y is 20 (sum of m and n in example 1), yielding surfactant D3 #; the remaining conditions were the same as in example 1. .
Comparative example 4 surfactant D4#
Comparative example 4 differs from example 1 in that: in the step (1), 26.4g of methyl propionate and 46.4g N, N-dimethyl-1, 4-butanediamine are used as raw materials, 1.5g of sodium formate is added to react for 24 hours at the temperature of 100 ℃, 2.5ml of acetic acid is dropwise added after the reaction is completed, the mixture is stirred for 1 hour, a light yellow solid is obtained after cooling, and the mixture is dried in an oven at the temperature of 105 ℃ to obtain a (4-dimethylaminobutyl) propionamide crude product; weighing 29.6g (4-dimethylaminobutyl) propionamide crude product, reacting with 25.0g bromododecane at 50 ℃ to obtain an amido-containing quaternary ammonium salt surfactant mixture, and recrystallizing with acetone to obtain a cationic surfactant D1 #.
In the step (2), 40.0g of water is added into the reaction kettle, 5.0g of high molecular surfactant is added into the reaction kettle while stirring at the temperature of 30-40 ℃, and the mixture is stirred for 2 hours; then adding 2.0g of nonionic surfactant and 38.0g of cationic surfactant D1#, stirring for 1 hour, adding 10.0g of ethanol, continuing stirring for 1 hour, and uniformly mixing to obtain surfactant D4 #; the remaining conditions were the same as in example 1.
Experimental example 1 measurement of surface tension, interfacial tension, oil-washing rate, oil recovery rate and depressurization rate of a surfactant
Taking the surfactants 1# -9# and D1# -D4# prepared in the examples 1-9 and the comparative examples 1-4, respectively preparing solutions with the mass concentration of 0.3wt% by using distilled water, respectively testing the surface tension, the interfacial tension, the oil washing rate, the pressure reduction rate and the oil recovery rate of each surfactant, wherein the test results are shown in the table 1, and the test methods are as follows:
surface tension: according to the testing method of the technical requirement of the surfactant for reducing pressure and increasing injection of Q/SH 10202252-2019, the surface tension of the surfactant is measured by using a JYW-200B full-automatic interfacial tension meter at the testing temperature of 25 ℃.
Interfacial tension: according to the testing method of the technical requirements of the surfactant for reducing pressure and increasing injection of Q/SH 10202252-2019, measuring the oil-water interfacial tension by using a TX-500C type interfacial tension meter at the testing temperature of 70 ℃;
oil washing rate: the method uses Zheng 32-Ping 28 crude oil as a test oil sample, and tests the oil washing rate according to the test method of the technical requirement of the surfactant for reducing pressure and increasing injection of Q/SH 10202252-2019. The physical property information of Zheng 32-Ping 28 crude oil is shown in the following table:
TABLE 1
Figure 736497DEST_PATH_IMAGE012
The blood pressure reduction rate is as follows: zheng 32-Ping 28 is used as a test oil sample, and the depressurization rate is tested according to a test method of the technical requirement of the surfactant for depressurization and injection enhancement of Q/SH 10202252-2019.
Recovery ratio: has a length of 30cm, a diameter of 2.5cm and a permeability of 1.5 μm2Performing an oil displacement test on the rock core, namely performing displacement by using the Shengli oil field stratum until the water content is 92 percent, transferring surfactant solution (0.4 pv), stopping the displacement when the gas displacement is more than 1.2pv until the accumulated gas displacement, then performing water displacement until the water content is 100 percent, and respectively calculating the improved recovery ratio.
TABLE 2
Figure 746041DEST_PATH_IMAGE013
As can be seen from Table 2, the surfactant of the present invention can significantly reduce the oil-water interfacial tension, reduce the water injection pressure, and increase the oil-washing rate, thereby greatly increasing the crude oil recovery ratio.
Experimental example 2 measurement of salt resistance and temperature resistance of surfactant
Taking the surfactants 1# -9# and D1# -D4# prepared in the examples 1-9 and the comparative examples 1-4, respectively, preparing solutions with the mass concentration of 0.3wt% by using distilled water, respectively, and respectively testing the salt resistance and the temperature resistance of each surfactant solution, wherein the test results are shown in Table 2, and the test methods are as follows:
salt resistance: according to the technical requirements of the Q/SH 10202252-2019 surfactant for pressure reduction and injection increase, 40000mg/L and 80000mg/L standard saline are prepared, 40000mg/L and 80000g/L standard saline are prepared into 0.3wt% of surfactant solution respectively, the oil-water interfacial tension is measured by using a TX-500C type interfacial tension meter, and the surface tension is measured by using a JYW-200B full-automatic interfacial tension meter, wherein the interfacial tension test temperature is 70 ℃, and the surface tension test temperature is 25 ℃.
Temperature resistance: according to the testing method of the technical requirements of the surfactant for reducing pressure and increasing injection of Q/SH 10202252-2019, 0.3wt% of surfactant solution is prepared by distilled water, the surfactant solution is filled into a temperature-resistant pressure-resistant container, a screw thread is tightened, the container is placed in a 130 ℃ oven in a sealing mode, after the temperature is kept for 48 hours, the container is taken out and cooled to the room temperature, and the surface tension of the container is measured by a JYW-200B full-automatic interfacial tension meter.
TABLE 3
Figure 920671DEST_PATH_IMAGE014
As can be seen from Table 3, the surfactant prepared by the invention has good salt tolerance, is suitable for the stratum with larger mineralization degree, has good temperature resistance and stable performance at the temperature of the oil reservoir stratum.
The above description is only an example of the present application, and the protection scope of the present application is not limited by these specific examples, but is defined by the claims of the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the technical idea and principle of the present application should be included in the protection scope of the present application.

Claims (8)

1. A surfactant for improving the water injection efficiency of a low permeability reservoir is characterized by comprising the following components in parts by weight: 1-5 parts of nonionic surfactant, 25-50 parts of cationic surfactant, 0.01-10 parts of high molecular surfactant, 20-60 parts of water and 0.01-10 parts of low molecular alcohol containing 1-8 carbon atoms;
wherein the molecular formula of the nonionic surfactant is shown as formula I:
Figure 293408DEST_PATH_IMAGE001
the compound has a structure shown in a formula I,
the R is1、R2、R4、R6Are all ethyl, said R3、R5Independently selected from one of straight chain or branched chain hydrocarbon groups containing 6 carbon atoms to 20 carbon atoms, and m and n are independently selected from integers between 1 and 20;
the molecular formula of the cationic surfactant is shown as a formula II:
Figure 741706DEST_PATH_IMAGE002
the compound of the formula II is shown in the specification,
the R is7、R8Independently selected from one of linear or branched hydrocarbon groups containing 1 to 5 carbon atoms, and R is9、R11Independently selected from one of linear alkyl containing 1 to 3 carbon atoms, R10Selected from linear or branched hydrocarbons containing from 1 to 20 carbon atomsOne of the radicals, said X being Cl or Br;
the molecular formula of the high molecular surfactant is shown as a formula III:
Figure 787023DEST_PATH_IMAGE003
in the formula (III), the reaction is carried out,
wherein, R is12One selected from alkyl, cycloalkyl, alkenyl or aryl with straight chain or branched chain containing 8 to 20 carbon atoms, and R is13One selected from methyl, ethyl and propyl, and R is14One selected from linear alkyl containing 0-5 carbon atoms, M is selected from one of sulfate, carboxylate and sulfonate, and p and q are independently selected from integers between 1 and 500.
2. The surfactant of claim 1, wherein R is12One selected from alkyl, cycloalkyl, alkenyl or aryl with straight chain or branched chain containing 8 to 18 carbon atoms, wherein R is13Is methyl, said R14One selected from straight chain alkyl containing 0-3 carbon atoms, and p and q are independently selected from integers between 1-50.
3. The surfactant according to claim 1 or 2, wherein R is represented by the formula I3、R5Independently selected from one of straight chain or branched chain hydrocarbon groups containing 8 carbon atoms to 12 carbon atoms, and m and n are independently selected from integers between 1 and 20.
4. The surfactant according to claim 1 or 2, wherein R is represented by formula II7One selected from the group consisting of linear or branched hydrocarbon groups having 1 to 3 carbon atoms, and R8One selected from the group consisting of linear or branched hydrocarbon groups having 3 to 5 carbon atoms, and R9、R11Same as R in the formula10And one selected from linear or branched hydrocarbon groups having 1 to 15 carbon atoms, wherein X is Cl or Br.
5. The surfactant according to claim 1 or 2, characterized in that the cationic surfactant is synthesized by the following route:
Figure 713391DEST_PATH_IMAGE004
。
6. the surfactant according to claim 1 or 2, characterized in that it comprises, in parts by weight: 2 parts of nonionic surfactant and 38 parts of cationic surfactant.
7. A process for preparing the surfactant of claim 1, comprising the steps of: and stirring the nonionic surfactant, the cationic surfactant and water at 20-50 ℃ for not less than 1h to prepare the surfactant.
8. Use of the surfactant of any of claims 1-6 or the surfactant produced by the method of claim 7 for improving the efficiency of waterflooding of low permeability reservoirs having a permeability of no more than 50 x 10-3μm2。
CN202111502313.3A 2021-12-10 2021-12-10 Surfactant for improving water injection efficiency of low-permeability reservoir and preparation method and application thereof Active CN113897190B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111502313.3A CN113897190B (en) 2021-12-10 2021-12-10 Surfactant for improving water injection efficiency of low-permeability reservoir and preparation method and application thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111502313.3A CN113897190B (en) 2021-12-10 2021-12-10 Surfactant for improving water injection efficiency of low-permeability reservoir and preparation method and application thereof

Publications (2)

Publication Number Publication Date
CN113897190A CN113897190A (en) 2022-01-07
CN113897190B true CN113897190B (en) 2022-04-05

Family

ID=79025694

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111502313.3A Active CN113897190B (en) 2021-12-10 2021-12-10 Surfactant for improving water injection efficiency of low-permeability reservoir and preparation method and application thereof

Country Status (1)

Country Link
CN (1) CN113897190B (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109652048A (en) * 2018-12-28 2019-04-19 中国石油大学(北京) A kind of compound oil displacement agent and its preparation method and application
CN109913193A (en) * 2017-12-13 2019-06-21 中国石油天然气股份有限公司冀东油田公司钻采工艺研究院 A kind of low-permeability oil deposit water injection well increasing injection agent and preparation method thereof
CN112226223A (en) * 2019-07-15 2021-01-15 中国石油化工股份有限公司 Surfactant composition for pressure reduction and injection increase of ultra-low permeability oil reservoir and preparation method thereof
CN112980420A (en) * 2019-12-12 2021-06-18 中国石油化工股份有限公司 Blood pressure reducing and injection increasing agent and preparation method thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109913193A (en) * 2017-12-13 2019-06-21 中国石油天然气股份有限公司冀东油田公司钻采工艺研究院 A kind of low-permeability oil deposit water injection well increasing injection agent and preparation method thereof
CN109652048A (en) * 2018-12-28 2019-04-19 中国石油大学(北京) A kind of compound oil displacement agent and its preparation method and application
CN112226223A (en) * 2019-07-15 2021-01-15 中国石油化工股份有限公司 Surfactant composition for pressure reduction and injection increase of ultra-low permeability oil reservoir and preparation method thereof
CN112980420A (en) * 2019-12-12 2021-06-18 中国石油化工股份有限公司 Blood pressure reducing and injection increasing agent and preparation method thereof

Also Published As

Publication number Publication date
CN113897190A (en) 2022-01-07

Similar Documents

Publication Publication Date Title
Saxena et al. Characterizations of surfactant synthesized from palm oil and its application in enhanced oil recovery
AU2011293113B2 (en) Alkoxy carboxylate surfactants
CA2773922C (en) Method of manufacture and use of large hydrophobe ether sulfate surfactants in enhanced oil recovery (eor) applications
CN109652048B (en) Composite oil displacement agent and preparation method and application thereof
CN110423599B (en) Bio-based anionic surfactant and preparation method and application thereof
MX2012008820A (en) Styrylphenol alkoxylate sulfate as a new surfactant composition for enhanced oil recovery applications.
RU2647554C2 (en) Surfactant composition, production and use thereof
CN112251208A (en) Oil displacement surfactant for high-temperature high-salt oil reservoir and preparation method and application thereof
CN112226223A (en) Surfactant composition for pressure reduction and injection increase of ultra-low permeability oil reservoir and preparation method thereof
CN106631912A (en) Hydroxysulfobetaine surfactant and preparation method and application thereof
CN113897190B (en) Surfactant for improving water injection efficiency of low-permeability reservoir and preparation method and application thereof
CN112980420A (en) Blood pressure reducing and injection increasing agent and preparation method thereof
CN109957384B (en) Cation-nonionic alcohol ether glucoside type drag reducer
CN112707945B (en) Surfactant for anion-cation oil displacement and preparation method and application thereof
CN111073622B (en) Surfactant composition for improving recovery ratio and preparation method and application thereof
CN112680207A (en) Surfactant composition for oil extraction in oil field and preparation method thereof
CN111073620A (en) Surfactant composition
SU1724859A1 (en) Compound for oil production control
CN107201217B (en) Salt-resistant strong-inhibition foaming agent for shale stratum foam drilling
CN111719158B (en) Corrosion inhibitor composition suitable for wide flow rate range and preparation method thereof
CN114644914B (en) Oilfield depressurization injection increasing agent and preparation method and application thereof
CN110129020B (en) Viscoelastic surfactant system and application thereof in exploitation of water-drive heavy oil reservoir
CN114507164A (en) Gemini surfactant, preparation method, composition and application thereof
CN107216864B (en) The preparation and its application of sulfobetaines of the one kind containing double long-chain alkoxy bases
CN115873577B (en) Wettability regulator composition and preparation method and application thereof

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant