CN112694881A - Foam composition for enhanced oil recovery of fractured oil reservoir and preparation method thereof - Google Patents
Foam composition for enhanced oil recovery of fractured oil reservoir and preparation method thereof Download PDFInfo
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- 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
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- 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
- C09K8/588—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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- 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
- C09K8/92—Compositions for stimulating production by acting on the underground formation characterised by their form or by the form of their components, e.g. encapsulated material
- C09K8/94—Foams
Abstract
The invention discloses a foam composition for enhanced oil recovery of a fractured reservoir and a preparation method thereof. The composition comprises: the long-chain polyether compound comprises 1 part of long-chain polyether nitrogen-containing compound, 0.1-50 parts of anionic surfactant and 0.1-50 parts of cationic surfactant in parts by weight; the preparation method comprises the following steps: the components are mixed according to the use amounts to prepare the foam composition. The foam composition of the present invention has good foaming capacity and foam stability, low liquid separation speed, and high surface viscosity, so that good plugging can be formed in cracks.
Description
Technical Field
The invention relates to the technical field of oil extraction, in particular to a foam composition for enhanced oil extraction of a fractured reservoir and a preparation method thereof.
Background
Gas flooding is one of the ways for effectively improving the recovery ratio of an oil reservoir at home and abroad, but in the gas flooding replacement process, the serious technical problem exists, namely, the viscosity contrast of underground crude oil and injected gas is high, so that unfavorable fluidity ratio is caused, early gas breakthrough is caused, and the sweep coefficient of the oil reservoir is reduced; and due to the heterogeneity of the oil reservoir, especially when cracks exist, gas is blown out of the cracks, and the oil production is reduced. Researches find that the foam can increase the viscosity and reduce the fluidity, and in addition, the foam also has the advantages of large blockage and small blockage. However, it has been reported that in highly heterogeneous formations characterized by fissures, foam does not work well. The reason for this may be that the liquid film stability of the foam has an inherent transient character, requiring continuous regeneration. However, in the cracks and holes, continuous regeneration of the foam is difficult to achieve because the cracks and holes may not provide sufficient pore restriction for the generation of the foam liquid film.
Therefore, the development of a new foam composition to adapt to fractured reservoirs is a technical problem to be solved at present.
Disclosure of Invention
In order to solve the problem of weakened foaming effect of a fractured reservoir in the prior art, the invention provides a foaming composition for enhanced oil recovery of the fractured reservoir and a preparation method thereof. The foam composition of the present invention has good foaming capacity and foam stability, low liquid separation speed, and high surface viscosity, so that good plugging can be formed in cracks.
It is an object of the present invention to provide a foam composition for enhanced oil recovery in fractured reservoirs.
The method comprises the following steps:
the long-chain polyether compound comprises 1 part by weight of long-chain polyether nitrogen-containing compound, 0.1-50 parts by weight of anionic surfactant and 0.1-50 parts by weight of cationic surfactant
The structural formula of the long-chain polyether nitrogen-containing compound is as follows:
wherein the content of the first and second substances,
r is C8～C40Alkyl or alkylbenzene, preferably C10～C24Alkyl or alkylbenzene of (a);
m + n is an integer of 0-20; preferably any integer of 1-10;
k is 0 or 1;
p is an integer of 0 to 3;
R1is C2H4Or C3H6；
R3Is C1～C5Alkylene or substituted alkylene of (a); preferably C1～C3An alkylene group of (a);
R2，R4and R5Is H, C1～C5Alkyl of (a), (b) or (C)3H6O)1-5H, or (C)2H4O)1-5Any one of H; preferably C1～C3Alkyl of (a), (b) or (C)3H6O)1-3H, or (C)2H4O)1-3Any one of H;
the structural formula of the anionic surfactant is as follows:
wherein the content of the first and second substances,
r is C8～C40Alkyl, unsaturated alkyl, or alkylbenzene; preferably C10～C24Alkyl or alkylbenzene of (a);
a is an integer of 0-20; b is an integer of 0-20, and a + b is preferably any integer of 1-15;
k is 0 or 1, and k is a linear or cyclic alkyl group,
r' is C1～C5The alkyl group or the substituted alkyl group of (a),
x is an anionic group-COOM or-SO3M，
M is an alkali metal or ammonium salt;
the structural formula of the cationic surfactant is as follows:
wherein the content of the first and second substances,
r is C8～C40Alkyl or alkylbenzene, preferably C8～C24Alkyl or alkylbenzene of (a);
e + f is an integer of 0-20; preferably any integer of 1 to 10
k is 0 or 1;
q is an integer of 0 to 3;
R1is C2H4Or C3H6；
R3Is C1～C5Alkylene or substituted alkylene of (a); preferably C1～C3An alkylene group of (a);
R2，R4and R5Is H, C1～C5Alkyl of (a), (b) or (C)3H6O)1-5H, or (C)2H4O)1-5Any one of H; preferably C1～C3Alkyl of (a), (b) or (C)3H6O)1-3H, or (C)2H4O)1-3H, one of the groups.
R6Is C1～C5Alkyl or substituted alkyl of (a);
y is Cl or Br.
The weight ratio of the long-chain polyether nitrogen-containing compound to the anionic surfactant and the cationic surfactant is preferably 1 (0.1-10) to 0.1-10.
The second object of the present invention is to provide a process for preparing a foam composition.
The method comprises the following steps:
the components are mixed according to the use amounts to prepare the foam composition.
Preference is given to
The components are added into water according to the using amount, the concentration of an aqueous solution is preferably 0.15-1 wt%, and the foaming agent composition for the enhanced oil recovery of the fractured oil reservoir is prepared by uniformly mixing.
The key active ingredients of the foaming agent are long-chain polyether nitrogen-containing compounds, anionic surfactants and cationic surfactants, and the person skilled in the art knows that for convenience of transportation and storage or on-site use, the foaming agent can be supplied in various forms, such as non-aqueous solid form, aqueous paste form or aqueous solution form; the water solution form comprises a form of preparing a concentrated solution by using water and a form of directly preparing a foaming agent with concentration required by on-site oil displacement; the water is not particularly required, and can be deionized water or water containing inorganic mineral substances, and the water containing the inorganic mineral substances can be tap water, oil field formation water or oil field injection water.
The foaming agent composition has good compatibility, and other treating agents commonly used in the field, such as surfactant, alkali and other oil extraction aids, can be added into the formula. The dosage of the composition is conventional dosage, and the technical personnel can adjust the composition according to actual conditions.
The long-chain polyether nitrogen-containing compound in the foaming agent composition has higher surface viscosity due to the interaction of hydrogen bonds between hydrophilic groups, the surface viscosity of an interface film is increased under the electrostatic attraction effect between hydrophilic groups of an anionic surfactant and a cationic surfactant, the liquid precipitation speed of foam is reduced due to the increase of the surface viscosity, and the stability of the foam is increased after the foam is generated, so that the foam is not easy to crack after being formed in a matrix and then reaches a crack, the higher viscosity is maintained, and the effects of plugging the crack and improving the recovery ratio are achieved. In two parallel cores with a crack of 0.2mm and a matrix of 100mD, the foaming agent and the gas formed composition are injected, the oil injected into the crack of 1.5PV is completely displaced, and then 80 percent of the oil injected into the matrix of 1.5PV is displaced, so that better technical effects are achieved.
Detailed Description
The present invention is described in detail below with reference to examples, it should be noted that the following examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention, and those skilled in the art can make some insubstantial modifications and adaptations of the present invention according to the present disclosure.
Example 1
Nitrogen-containing long-chain polyether compound C10H21O(C3H6O)7(C2H4O)3C2H4N(C3H7O)C3H6N(CH3)2Preparation of O:
a)C10H21O(C3H6O)7(C2H4O)3C2H4preparation of Cl:
adding C into a four-neck round-bottom flask provided with a reflux condensing device, a thermometer, a stirrer and a gas absorption device10H21O(C3H6O)7(C2H4O)4H741 g (1.0 mol), thionyl chloride 149 g (1.25 mol) and DMF 5 g were reacted at 90 ℃ for 5 hours. After the reaction is finished, excess thionyl chloride is evaporated under reduced pressure to obtain C10H21O(C3H6O)7(C2H4O)3CH2CH2Cl, yield 93%.
b)C10H21O(C3H6O)7(C2H4O)3C2H4N(C3H7O)C3H6N(CH3)2The preparation of (1):
mixing C synthesized in a)10H21O(C3H6O)7(C2H4O)3CH2CH2Adding 371 g (0.5 mol) of Cl into a four-neck flask with a reflux condenser, a thermometer and a stirrer, heating to 60 ℃, adding 70 g of toluene, stirring uniformly, and slowly dropwise adding 61 g (0.5 mol) of N, N-dimethyl-1, 3-propanediamine and 48 g (0.7 mol) of pyridineThe temperature of the mixed solution is controlled to be less than 60 ℃, and the mixed solution is dripped to be heated to 85 ℃ for reaction for 2 hours. Cooling, filtering, recrystallizing the crude product with ethanol, and vacuum drying to obtain C10H21O(C3H6O)7(C2H4O)3C2H4NHC3H6N(CH3)2The yield thereof was found to be 88%.
Feeding C into a reactor equipped with a condensing device, a stirring device and a gas disperser10H21O(C3H6O)7(C2H4O)3C2H4NHC3H6N(CH3)2243 g (0.3 mol), heating to 80-90 ℃, starting a vacuum system, dehydrating for 1 hour under high vacuum, then purging for 3-4 times by using nitrogen to remove air in the system, adjusting the reaction temperature of the system to 130 ℃, slowly introducing 17.5 g (0.3 mol) of propylene oxide, and carrying out alkoxylation; after the reaction is finished, purging the system by nitrogen to remove unreacted propylene oxide, cooling, neutralizing, decoloring, filtering and dehydrating to obtain C10H21O(C3H6O)7(C2H4O)3C2H4N(C3H7O)C3H6N(CH3)2The yield thereof was found to be 93%.
c)C10H21O(C3H6O)7(C2H4O)3C2H4N(C3H7O)C3H6N(CH3)2Preparation of O:
c is to be10H21O(C3H6O)7(C2H4O)3C2H4N(C3H7O)C3H6N(CH3)2173 g (0.2 mol) of the reaction mixture was charged into a four-necked flask equipped with a reflux condenser, a thermometer and a stirrer, and the mixture was heated to 60 ℃ to slowly add H dropwise2O230 g, reacted at 70 ℃ for 5 hours, treated to obtain C10H21O(C3H6O)7(C2H4O)3C2H4N(C3H7O)C3H6N(CH3)2O, yield 80 wt%.
Anionic surfactant C12H25(C3H6O)1(C2H4O)3C2H4SO3Preparation of Na:
360 g of C was added to a four-necked round-bottomed flask equipped with a reflux condenser, a thermometer and a stirrer12H25(C3H6O)1(C2H4O)3H (1.0 mol), toluene 200g and sodium hydroxide 50 g (1.25 mol) are heated to 60 ℃ under stirring, and reacted for 2 hours, then sodium chloroacetsulfonate 208 g (1.25 mol) is slowly added, and after the dropwise addition, the reaction is carried out for 7 hours at 90 ℃, and C is obtained after treatment12H25(C3H6O)1(C2H4O)3C2H4SO3Na, yield 87 wt%.
Cationic surfactant C16H33(C2H4O)1C2H4N(C3H7O)C3H6N(CH3)3Preparation of Br:
a)C16H33O(C2H4O)1C2H4preparation of Cl:
the preparation process is the same as that of the nitrogen-containing long-chain polyether compound a) in example 1, and only differs from the raw materials (C)16H33O(C2H4O)2H, thionyl chloride).
b)C16H33(C2H4O)1C2H4N(C3H7O)C3H6N(CH3)2The preparation of (1):
the preparation process is the same as that of the nitrogen-containing long-chain polyether compound b) in example 1, and only differs from the raw materials (C)16H33O(C2H4O)1C2H4Cl, N-dimethyl-1, 3-propanediamine).
c)C16H33(C2H4O)1C2H4N(C3H7O)C3H6N(CH3)3Preparation of Br:
c is to be16H33(C2H4O)1C2H4N(C3H7O)C3H6N(CH3)2457 g (1.0 mol) and 95 g (1.0 mol) of methyl bromide are put into a pressure reactor with a stirring device, reacted for 4 hours under the pressure of 0.2 to 0.3MPa under the condition that KOH is used as a catalyst, and subjected to post-treatment to obtain C16H33(C2H4O)1C2H4N(C3H7O)C3H6N(CH3)3Br, yield 90%.
Preparation of composition F-1:
weighing 1g C at normal temperature and pressure10H21O(C3H6O)7(C2H4O)3C2H4N(C3H7O)C3H6N(CH3)2O, 1g of C12H25(C3H6O)1(C2H4O)3C2H4SO3Na and 1g of C16H33(C2H4O)1C2H4N(C3H7O)C3H6N(CH3)3Adding Br into a reaction kettle, adding a proper amount of local tap water to 300g, preparing into a 1 wt% solution, and fully stirring for 30min until the Br is completely dissolved to obtain the foaming agent composition F-1.
Example 2
Preparation of nitrogen-containing compound of long-chain polyether:
the difference from example 1 is only that the starting materials are different (C)24H49O(C2H4O)2H, thionyl chloride, methyl diamine, ethylene oxide, H2O2) The procedure is as in example 1 to give C24H49O(C2H4O)C2H4NHCH2N(C2H5O)2O
Preparation of anionic surfactant:
the difference from example 1 is only that the starting materials are different (C)10H21O(C3H6O)10(C2H4O)5Sodium H, 3-chloro-2-hydroxypropanesulfonate) was prepared as in example 1 to yield C10H21O(C3H6O)10(C2H4O)5CH2CH(OH)CH2SO3Na；
The difference from example 1 is only that the starting materials are different (C)10H21O(C3H6O)11H, N, N, N' -trimethyl-1, 3-propanediamine, methyl bromide) preparation procedure of example 1 gave C10H21O(C3H6O)10C3H6N(CH3)C3H6N(CH3)3Br。
Preparation of composition F-2:
weighing 0.1g C at normal temperature and pressure24H49O(C2H4O)C2H4NHCH2N(C2H5O)2O, 1.0g of C10H21O(C3H6O)10(C2H4O)5CH2CH(OH)CH2SO3Na and 1.0g of C10H21O(C3H6O)10C3H6N(CH3)C3H6N(CH3)3Adding Br into a reaction kettle, adding a proper amount of local tap water to 300g, preparing into a 0.7 wt% solution, and fully stirring for 30min until the Br is completely dissolved to obtain the foaming agent composition F-2.
Example 3
Preparation of nitrogen-containing compound of long-chain polyether:
the difference from example 1 is only that the starting materials are different (C)14H29O(C3H6O)3(C2H4O)3H, thionyl chloride, N, N' -trimethyldipropylenetriamine, propylene oxide, H2O2) The procedure is as in example 1 to give C14H29O(C3H6O)3(C2H4O)2C2H4(N(CH3)C3H6)2N(C3H7O)(CH3)O；
Preparation of anionic surfactant:
the difference from example 1 is only that the starting materials are different (C)12H25O(C3H6O)3(C2H4O)7H, 3-chloropropylamine) preparation procedure of example 1 gave C12H25O(C3H6O)3(C2H4O)7C2H4COONH4
Preparation of cationic surfactant:
the difference from example 1 is only that the starting materials are different (C)24H49O(C2H4O)9H, thionyl chloride, N, N ', N ", N' -tetramethyltripropylenetetramine, ethylene oxide, ethyl chloride) was prepared as in example 1 to give C24H49O(C2H4O)8C2H4(N(CH3)C3H6)3N(CH3)(C2H4OC2H4OH)(C2H5)Cl；
Preparation of composition F-3:
weighing 1.0g C at normal temperature and pressure14H29O(C3H6O)3(C2H4O)2C2H4(N(CH3)C3H6)2N(C3H7O)(CH3)O，0.1g of C12H25O(C3H6O)3(C2H4O)7C2H4COONH4And 0.1g of C24H49O(C2H4O)8C2H4(N(CH3)C3H6)3N(CH3)(C2H4OC2H4OH)(C2H5) Adding an appropriate amount of local tap water to 240g into a reaction kettle, preparing into 0.3 wt% solution, and fully stirring for 30min until the solution is completely dissolved to obtain the foaming agent composition F-3.
Example 4
Preparation of nitrogen-containing compound of long-chain polyether:
the difference from example 1 is only that the starting materials are different (C)16H33O(C2H4O)3H, thionyl chloride, N, N' -tetramethyltripropylenetetramine, propylene oxide, H2O2) The preparation process is the same as example 1; to obtain C16H33O(C2H4O)2C2H4(N(CH3)C3H6)3N(CH3)(C2H4OC2H4OH)O
Preparation of anionic surfactant:
the difference from example 1 is only that the starting materials are different (C)8H17O(C3H6O)7(C2H4O)3H, sodium chloroethanesulfonate) was prepared in the same manner as in example 1; to obtain C8H17O(C3H6O)7(C2H4O)3C2H4SO3Na；
Preparation of cationic surfactant:
the difference from example 1 is only that the starting materials are different (C)10H21O(C3H6O)3C2H4OH, thionyl chloride, N, N-dimethyl-1, 3-propanediamine, ethylene oxide, methyl chloride) preparation C was prepared as in example 110H21O(C3H6O)3C2H4N(C2H4OH)C3H6N(CH3)3Cl。
Preparation of composition F-4:
weighing 0.1g C at normal temperature and pressure16H33O(C2H4O)2C2H4(N(CH3)C3H6)3N(CH3)(C2H4OC2H4OH) O, 0.7g of C8H17O(C3H6O)7(C2H4O)3C2H4SO3Na and 0.2g of C10H21O(C3H6O)3C2H4N(C2H4OH)C3H6N(CH3)3Adding an appropriate amount of local tap water to 500g into a reaction kettle, preparing into 0.2 wt% solution, and fully stirring for 30min until the solution is completely dissolved to obtain the foaming agent composition F-4.
Example 5
Preparation of nitrogen-containing compound of long-chain polyether:
the same as example 1;
preparation of anionic surfactant:
the same as example 1;
preparation of cationic surfactant:
the same as in example 1.
Preparation of composition F-5:
weighing 0.02g C at normal temperature and pressure10H21O(C3H6O)7(C2H4O)3C2H4N(C3H7O)C3H6N(CH3)2O, 1.0g of C12H25(C3H6O)1(C2H4O)3C2H4SO3Na and 1.0g of C16H33(C2H4O)1C2H4N(C3H7O)C3H6N(CH3)3Adding Br into a reaction kettle, adding a proper amount of local tap water to 102g, preparing into a 1 wt% solution, and fully stirring for 30min until the solution is completely dissolved to obtain the foaming agent composition F-5.
Example 6
Preparation of nitrogen-containing compound of long-chain polyether:
the difference from example 1 is only that the starting materials are different (C)14H29Cl, N, N-dimethyl-1, 3-propanediamine, propylene oxide, H2O2) The preparation process is the same as example 1; to obtain C14H29N(C3H7O)C3H6N(CH3)2O
Anionic surfactant: sodium tetradecadectadecyl-olefin sulfonate, commercially available.
Preparation of cationic surfactant:
the difference from example 1 is only that the starting materials are different (C)14H27O(C3H6O)3(C2H4O)2H, thionyl chloride, dimethylamine, methyl chloride) was prepared in the same manner as in example 1 to obtain C14H27O(C3H6O)3(C2H4O)1C2H4N(CH3)3Cl。
Preparation of composition F-6:
weighing 1g C at normal temperature and pressure14H29N(C3H7O)C3H6N(CH3)2O, 1g of sodium tetradecadectadecyl-olefin sulfonate and 1g of C14H27O(C3H6O)3(C2H4O)1C2H4N(CH3)3Adding a proper amount of local tap water into the reaction kettle to 300g to prepare a 1 wt% solution, and fully stirring for 30min until the solution is completely dissolved to obtain the foaming agent composition F-6.
Example 7
Preparation of nitrogen-containing compound of long-chain polyether:
the difference from example 1 is only that the starting materials are different (C)15H23O(C3H6O)4H, thionyl chloride, dimethylamine, H2O2) The preparation process is the same as example 1; to obtain C15H23O(C3H6O)3C3H6N(CH3)2O
Preparation of anionic surfactant:
the difference from example 1 is only that the starting materials are different (C)24H49O(C2H4O)15H, sodium chloropropanesulfonate) was prepared as in example 1; to obtain C24H49O(C2H4O)15C3H6SO3Na
Preparation of cationic surfactant:
the difference from example 1 is only that the starting materials are different (C)14H29Cl, N, N-dimethyl-1, 3-propanediamine, propylene oxide, methyl chloride) was prepared in the same manner as in example 1 to give C14H29N(C3H7O)C3H6N(CH3)3Cl。
Preparation of composition F-7:
weighing 0.1g C at normal temperature and pressure15H23O(C3H6O)3C3H6N(CH3)2O, 0.4g of C24H49O(C2H4O)15C3H6SO3Na and 1g of C14H29N(C3H7O)C3H6N(CH3)3Adding a proper amount of local tap water into the reaction kettle to 300g to prepare a 0.5 wt% solution, and fully stirring for 30min until the solution is completely dissolved to obtain the foaming agent composition F-7.
Example 8
Preparation of nitrogen-containing compound of long-chain polyether:
the difference from example 1 is only in the raw material difference(C10H21O(C3H6O)20(C2H4O)16H, thionyl chloride, N, N-dimethyl-1, 3-propanediamine, propylene oxide, H2O2) The procedure is as in example 1 to give C10H21O(C3H6O)20(C2H4O)15C2H4N(C3H7O)C3H6N(CH3)2O
Preparation of anionic surfactant:
the difference from example 1 is only that the starting materials are different (C)12H25(C3H6O)15(C2H4O)7Sodium chloroethanesulfonate) was prepared as in example 1 to yield C12H25(C3H6O)15(C2H4O)7C2H4SO3Na
Preparation of cationic surfactant:
the difference from example 1 is only that the starting materials are different (C)16H33O(C3H6O)15(C2H4O)6H, thionyl chloride, N, N-dimethyl-1, 3-propanediamine, propylene oxide, methyl bromide) preparation procedure of example 1 gave C16H33O(C3H6O)15(C2H4O)5C2H4N(C3H7O)C3H6N(CH3)3Br。
Preparation of composition F-8:
weighing 1g of C at normal temperature and normal pressure10H21O(C3H6O)20(C2H4O)15C2H4N(C3H7O)C3H6N(CH3)2O, 1g of C12H25(C3H6O)15(C2H4O)7C2H4SO3NaAnd 1g of C16H33O(C3H6O)15(C2H4O)5C2H4N(C3H7O)C3H6N(CH3)3Adding Br into a reaction kettle, adding a proper amount of local tap water to 300g, preparing into a 1 wt% solution, and fully stirring for 30min until the Br is completely dissolved to obtain the foaming agent composition F-8.
Example 9
The fractures obtained from the saturated crude oil were connected in parallel with the matrix core, water flooding was first carried out until no oil flowed out, the water flooding recovery ratio was calculated, then the compositions F-1 to F-8 of examples 1 to 8 were co-injected with gas at 3.0PV, the volume ratio was 2 to 8, then displacement was carried out, the foam agent composition was calculated to increase the recovery ratio, and the results are shown in table 1.
TABLE 1 parallel enhanced recovery ratio test results
Comparative example 1
Weighing 1g C at normal temperature and pressure10H21O(C3H6O)7(C2H4O)3C2H4N(C3H7O)C3H6N(CH3)2Adding a proper amount of local tap water into a reaction kettle to 100g to prepare a 1 wt% solution, fully stirring for 30min until the solution is completely dissolved, connecting a crack obtained after the crude oil is saturated with a matrix core in parallel, performing water drive until oil does not flow out, calculating that the water drive recovery ratio matrix and the crack are respectively 12% and 57%, then injecting the 1% composition and gas into a reactor together to obtain 3.0PV, wherein the volume ratio is 2-8, and performing displacement to obtain a foaming agent composition, wherein the recovery ratio matrix and the crack are respectively 11% and 31%.
Comparative example 2
Weighing 1g C at normal temperature and pressure12H25(C3H6O)1(C2H4O)3C2H4SO3Na and 1g of C16H33(C2H4O)1C2H4N(C3H7O)C3H6N(CH3)3Adding Br into a reaction kettle, adding a proper amount of local tap water to 200g, preparing a 1 wt% solution, fully stirring for 30min until the solution is completely dissolved, connecting a crack obtained after the crude oil is saturated with the solution and a matrix core in parallel, performing water drive until oil does not flow out, calculating that the water drive recovery ratio matrix and the crack are respectively 12% and 55%, then injecting the 1% composition and gas into a reactor together to obtain 3.0PV, wherein the volume ratio is 2 to 8, and performing displacement, wherein the foam agent composition is calculated to improve the recovery ratio matrix and the crack to respectively 21% and 37%.
Claims (10)
1. A foam composition for enhanced oil recovery from fractured reservoirs, the composition comprising:
the long-chain polyether compound comprises 1 part of long-chain polyether nitrogen-containing compound, 0.1-50 parts of anionic surfactant and 0.1-50 parts of cationic surfactant in parts by weight;
the structural formula of the long-chain polyether nitrogen-containing compound is as follows:
wherein R is C8～C40M is an integer of 0 to 20; n is an integer of 0 to 20, k is 0 or 1, p is an integer of 0 to 3, R1Is C2H4Or C3H6；R3Is C1～C5Alkylene or substituted alkylene of (a); r2，R4And R5Is H, C1～C5Alkyl of (a), (b) or (C)3H6O)1-5H, or (C)2H4O)1-5One of H;
the structural formula of the anionic surfactant is as follows:
wherein R is C8～C40Alkyl, alkylbenzene; a is an integer of 0-20; b is an integer of 0 to 20, k is 0 or 1, R' is C1～C5X is an anionic group-COOM or-SO3M and M are alkali metal or ammonium salt;
the structural formula of the cationic surfactant is as follows:
wherein R is C8～C40E is an integer of 0 to 20; f is an integer of 0 to 20, k is 0 or 1, q is an integer of 0 to 3, R1Is C2H4Or C3H6；R3Is C1～C5Alkylene or substituted alkylene of (a); r2，R4And R5Is H, C1～C5Alkyl of (a), (b) or (C)3H6O)1-5H, or (C)2H4O)1-5One of H; r6Is C1～C5Alkyl or substituted alkyl of (a); y is Cl or Br.
2. The foam composition of claim 1, wherein:
r is C8～C24Alkyl or alkylbenzene.
3. The foam composition of claim 1, wherein:
m + n is any integer of 1 to 10.
4. The foam composition of claim 1, wherein:
R3is C1～C3An alkylene group of (a).
5. The foam composition of claim 1, wherein:
R2，R4and R5Is C1～C3Alkyl of (a), (b) or (C)3H6O)1-3H, or (C)2H4O)1-3H, any one of the above.
6. The foam composition of claim 1, wherein:
a + b is any integer of 1-15.
7. The foam composition of claim 1, wherein:
e + f is any integer of 1-10.
8. The foam composition according to any one of claims 1 to 7, wherein:
the weight ratio of the long-chain polyether nitrogen-containing compound to the anionic surfactant to the cationic surfactant is 1 (0.1-10) to 0.1-10.
9. A process for preparing a foam composition according to any one of claims 1 to 8, characterized in that it comprises:
the components are mixed according to the use amounts to prepare the foam composition.
10. A process for preparing a foam composition according to claim 9, wherein:
the components are added into water according to the using amount, the concentration of the solution is 0.15-1 wt%, and the foaming agent composition for the enhanced oil recovery of the fractured oil reservoir is prepared by uniformly mixing.
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| AU2010305911A1 (en) * | 2009-10-14 | 2012-04-12 | Basf Se | Process for tertiary mineral oil production using surfactant mixtures |
| CN104277806A (en) * | 2013-07-09 | 2015-01-14 | 中国石油化工股份有限公司 | Oil displacement composition and preparation method and application thereof |
| CN106590577A (en) * | 2015-10-20 | 2017-04-26 | 中国石油化工股份有限公司 | Foam composition and preparation method of the same |
| CN106590607A (en) * | 2015-10-20 | 2017-04-26 | 中国石油化工股份有限公司 | Temperature and salt resistance and low tension foaming agent composition and preparation method of the same |
| CN106590573A (en) * | 2015-10-20 | 2017-04-26 | 中国石油化工股份有限公司 | Foam scrubbing agent used for salt-resistant water drainage gas recovery, and preparation method and application thereof |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2010305911A1 (en) * | 2009-10-14 | 2012-04-12 | Basf Se | Process for tertiary mineral oil production using surfactant mixtures |
| CN104277806A (en) * | 2013-07-09 | 2015-01-14 | 中国石油化工股份有限公司 | Oil displacement composition and preparation method and application thereof |
| CN106590577A (en) * | 2015-10-20 | 2017-04-26 | 中国石油化工股份有限公司 | Foam composition and preparation method of the same |
| CN106590607A (en) * | 2015-10-20 | 2017-04-26 | 中国石油化工股份有限公司 | Temperature and salt resistance and low tension foaming agent composition and preparation method of the same |
| CN106590573A (en) * | 2015-10-20 | 2017-04-26 | 中国石油化工股份有限公司 | Foam scrubbing agent used for salt-resistant water drainage gas recovery, and preparation method and application thereof |
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