CN116103021A - Foaming agent for oil-based drilling fluid and preparation method and application thereof - Google Patents
Foaming agent for oil-based drilling fluid and preparation method and application thereof Download PDFInfo
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- CN116103021A CN116103021A CN202111327103.5A CN202111327103A CN116103021A CN 116103021 A CN116103021 A CN 116103021A CN 202111327103 A CN202111327103 A CN 202111327103A CN 116103021 A CN116103021 A CN 116103021A
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- 238000005553 drilling Methods 0.000 title claims abstract description 52
- 239000012530 fluid Substances 0.000 title claims abstract description 50
- 239000004088 foaming agent Substances 0.000 title claims abstract description 40
- 238000002360 preparation method Methods 0.000 title abstract description 7
- 150000001875 compounds Chemical class 0.000 claims abstract description 16
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000002253 acid Substances 0.000 claims abstract description 11
- 239000011230 binding agent Substances 0.000 claims abstract description 11
- 239000011737 fluorine Substances 0.000 claims abstract description 11
- 229910052731 fluorine Inorganic materials 0.000 claims abstract description 11
- 239000003960 organic solvent Substances 0.000 claims abstract description 11
- 239000007795 chemical reaction product Substances 0.000 claims abstract description 9
- -1 amino compound Chemical class 0.000 claims abstract description 8
- 230000001105 regulatory effect Effects 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims description 17
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 claims description 15
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 14
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 12
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims description 12
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 claims description 11
- YPFDHNVEDLHUCE-UHFFFAOYSA-N 1,3-propanediol Substances OCCCO YPFDHNVEDLHUCE-UHFFFAOYSA-N 0.000 claims description 10
- 229940035437 1,3-propanediol Drugs 0.000 claims description 10
- 229920000166 polytrimethylene carbonate Polymers 0.000 claims description 10
- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical compound C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 claims description 8
- 125000000217 alkyl group Chemical group 0.000 claims description 8
- CUPWBYQOIFVEGA-UHFFFAOYSA-N 2,2,3,3,4,4,5,5,6,6,6-undecafluorohexanoyl chloride Chemical compound FC(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(Cl)=O CUPWBYQOIFVEGA-UHFFFAOYSA-N 0.000 claims description 7
- AQQBRCXWZZAFOK-UHFFFAOYSA-N 2,2,3,3,4,4,5,5,6,6,7,7,8,8,8-pentadecafluorooctanoyl chloride Chemical compound FC(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(Cl)=O AQQBRCXWZZAFOK-UHFFFAOYSA-N 0.000 claims description 7
- PGFXOWRDDHCDTE-UHFFFAOYSA-N hexafluoropropylene oxide Chemical class FC(F)(F)C1(F)OC1(F)F PGFXOWRDDHCDTE-UHFFFAOYSA-N 0.000 claims description 7
- 150000001412 amines Chemical class 0.000 claims description 5
- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 claims description 4
- HSDJWNJDPDJOEV-UHFFFAOYSA-N 1,1,2,2,3,3,4,4,5,5,6,6,6-tridecafluorohexane-1-sulfonyl fluoride Chemical compound FC(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)S(F)(=O)=O HSDJWNJDPDJOEV-UHFFFAOYSA-N 0.000 claims description 3
- WFELVFKXQJYPSL-UHFFFAOYSA-N 2,2,3,3,4,4,4-heptafluorobutanoyl chloride Chemical compound FC(F)(F)C(F)(F)C(F)(F)C(Cl)=O WFELVFKXQJYPSL-UHFFFAOYSA-N 0.000 claims description 3
- MCEDOKUQJYNLKR-UHFFFAOYSA-N 2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,10-nonadecafluorodecanoyl chloride Chemical compound FC(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(Cl)=O MCEDOKUQJYNLKR-UHFFFAOYSA-N 0.000 claims description 3
- BHFJBHMTEDLICO-UHFFFAOYSA-N Perfluorooctylsulfonyl fluoride Chemical compound FC(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)S(F)(=O)=O BHFJBHMTEDLICO-UHFFFAOYSA-N 0.000 claims description 3
- LUYQYZLEHLTPBH-UHFFFAOYSA-N perfluorobutanesulfonyl fluoride Chemical compound FC(F)(F)C(F)(F)C(F)(F)C(F)(F)S(F)(=O)=O LUYQYZLEHLTPBH-UHFFFAOYSA-N 0.000 claims description 3
- 239000013638 trimer Substances 0.000 claims description 3
- 238000010979 pH adjustment Methods 0.000 claims 1
- 239000006260 foam Substances 0.000 abstract description 21
- 239000002283 diesel fuel Substances 0.000 abstract description 19
- 238000005187 foaming Methods 0.000 abstract description 9
- 238000006243 chemical reaction Methods 0.000 description 6
- 239000004094 surface-active agent Substances 0.000 description 5
- 239000000203 mixture Substances 0.000 description 4
- 239000000047 product Substances 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- XMMDVXFQGOEOKH-UHFFFAOYSA-N n'-dodecylpropane-1,3-diamine Chemical compound CCCCCCCCCCCCNCCCN XMMDVXFQGOEOKH-UHFFFAOYSA-N 0.000 description 2
- UKNVXIMLHBKVAE-UHFFFAOYSA-N n'-hexadecylpropane-1,3-diamine Chemical compound CCCCCCCCCCCCCCCCNCCCN UKNVXIMLHBKVAE-UHFFFAOYSA-N 0.000 description 2
- DXYUWQFEDOQSQY-UHFFFAOYSA-N n'-octadecylpropane-1,3-diamine Chemical compound CCCCCCCCCCCCCCCCCCNCCCN DXYUWQFEDOQSQY-UHFFFAOYSA-N 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- IUHFWCGCSVTMPG-UHFFFAOYSA-N [C].[C] Chemical group [C].[C] IUHFWCGCSVTMPG-UHFFFAOYSA-N 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- TUFJPPAQOXUHRI-KTKRTIGZSA-N n'-[(z)-octadec-9-enyl]propane-1,3-diamine Chemical compound CCCCCCCC\C=C/CCCCCCCCNCCCN TUFJPPAQOXUHRI-KTKRTIGZSA-N 0.000 description 1
- 238000011085 pressure filtration Methods 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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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
- C09K8/02—Well-drilling compositions
- C09K8/03—Specific additives for general use in well-drilling compositions
- C09K8/035—Organic additives
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C231/00—Preparation of carboxylic acid amides
- C07C231/02—Preparation of carboxylic acid amides from carboxylic acids or from esters, anhydrides, or halides thereof by reaction with ammonia or amines
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C233/00—Carboxylic acid amides
- C07C233/01—Carboxylic acid amides having carbon atoms of carboxamide groups bound to hydrogen atoms or to acyclic carbon atoms
- C07C233/34—Carboxylic acid amides having carbon atoms of carboxamide groups bound to hydrogen atoms or to acyclic carbon atoms having the nitrogen atom of at least one of the carboxamide groups bound to a carbon atom of a hydrocarbon radical substituted by amino groups
- C07C233/35—Carboxylic acid amides having carbon atoms of carboxamide groups bound to hydrogen atoms or to acyclic carbon atoms having the nitrogen atom of at least one of the carboxamide groups bound to a carbon atom of a hydrocarbon radical substituted by amino groups with the substituted hydrocarbon radical bound to the nitrogen atom of the carboxamide group by an acyclic carbon atom
- C07C233/36—Carboxylic acid amides having carbon atoms of carboxamide groups bound to hydrogen atoms or to acyclic carbon atoms having the nitrogen atom of at least one of the carboxamide groups bound to a carbon atom of a hydrocarbon radical substituted by amino groups with the substituted hydrocarbon radical bound to the nitrogen atom of the carboxamide group by an acyclic carbon atom having the carbon atom of the carboxamide group bound to a hydrogen atom or to a carbon atom of an acyclic saturated carbon skeleton
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C235/00—Carboxylic acid amides, the carbon skeleton of the acid part being further substituted by oxygen atoms
- C07C235/02—Carboxylic acid amides, the carbon skeleton of the acid part being further substituted by oxygen atoms having carbon atoms of carboxamide groups bound to acyclic carbon atoms and singly-bound oxygen atoms bound to the same carbon skeleton
- C07C235/04—Carboxylic acid amides, the carbon skeleton of the acid part being further substituted by oxygen atoms having carbon atoms of carboxamide groups bound to acyclic carbon atoms and singly-bound oxygen atoms bound to the same carbon skeleton the carbon skeleton being acyclic and saturated
- C07C235/10—Carboxylic acid amides, the carbon skeleton of the acid part being further substituted by oxygen atoms having carbon atoms of carboxamide groups bound to acyclic carbon atoms and singly-bound oxygen atoms bound to the same carbon skeleton the carbon skeleton being acyclic and saturated having the nitrogen atom of at least one of the carboxamide groups bound to an acyclic carbon atom of a hydrocarbon radical substituted by nitrogen atoms not being part of nitro or nitroso groups
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C303/00—Preparation of esters or amides of sulfuric acids; Preparation of sulfonic acids or of their esters, halides, anhydrides or amides
- C07C303/36—Preparation of esters or amides of sulfuric acids; Preparation of sulfonic acids or of their esters, halides, anhydrides or amides of amides of sulfonic acids
- C07C303/38—Preparation of esters or amides of sulfuric acids; Preparation of sulfonic acids or of their esters, halides, anhydrides or amides of amides of sulfonic acids by reaction of ammonia or amines with sulfonic acids, or with esters, anhydrides, or halides thereof
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C311/00—Amides of sulfonic acids, i.e. compounds having singly-bound oxygen atoms of sulfo groups replaced by nitrogen atoms, not being part of nitro or nitroso groups
- C07C311/01—Sulfonamides having sulfur atoms of sulfonamide groups bound to acyclic carbon atoms
- C07C311/02—Sulfonamides having sulfur atoms of sulfonamide groups bound to acyclic carbon atoms of an acyclic saturated carbon skeleton
- C07C311/09—Sulfonamides having sulfur atoms of sulfonamide groups bound to acyclic carbon atoms of an acyclic saturated carbon skeleton the carbon skeleton being further substituted by at least two halogen atoms
-
- 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
- C09K8/02—Well-drilling compositions
- C09K8/32—Non-aqueous well-drilling compositions, e.g. oil-based
- C09K8/34—Organic liquids
Abstract
The invention provides a preparation method of a foaming agent for oil-based drilling fluid, which comprises the following steps: reacting an amino compound, an acid binding agent, an organic solvent and a fluorine-containing compound to obtain a reaction product; and regulating the pH value of the reaction product to 4-6 to obtain the foaming agent for the oil-based drilling fluid. The invention also provides a foaming agent for the oil-based drilling fluid and application thereof. The foaming agent for the oil-based drilling fluid can obviously reduce the surface tension of diesel oil, has stronger foaming capacity and foam stability in the diesel oil, and can be used for preparing the oil-based foam drilling fluid.
Description
Technical Field
The invention belongs to the technical field of treating agents for drilling fluid, and particularly relates to a foaming agent for oil-based drilling fluid, a preparation method and application thereof, which are used in the drilling process of Jiang Shuimin low-pressure easily-leaked stratum.
Background
In the drilling process of the low-pressure easy-leakage stratum, the conventional drilling fluid system is extremely easy to cause drilling fluid leakage, and the underground construction safety is affected. Foam drilling fluid is an effective means for solving the above-mentioned technical problems. However, for low-pressure water-sensitive stratum (such as shale gas layer drilling well, etc.), because clay is easy to be dispersed by hydration, the water-based foam drilling fluid is extremely easy to cause instability of the well wall, and an oil-based foam drilling fluid system is necessary to be used.
The core of the oil-based foam drilling fluid system is an oil-based foaming agent which can be dissolved in an oil phase, so that the interfacial tension of oil and gas is reduced, and finally, the oil-based foam with good stability is formed. Conventional fluorosurfactants are typically water-soluble surfactants, are difficult to dissolve in diesel fuel, and cannot foam in diesel fuel. The surfactants adopted in the prior art are all surfactants with conventional carbon-carbon chain structures, the self surface tension is large, the surface tension of diesel oil is difficult to reduce, the foaming capacity in the diesel oil is poor, and stable oil-based foam is difficult to form.
Disclosure of Invention
The invention aims to provide a foaming agent for oil-based drilling fluid, and a preparation method and application thereof.
The invention provides a foaming agent for oil-based drilling fluid, which has a structure shown in a formula I:
in the formula I, R 1 ＝C m F 2m+1 C n H 2n Or (b)
m is an integer of 3 to 8, n is an integer of 0 to 1, and x is an integer of 2 to 3;
R 2 is C12-C18 alkyl;
z is
Preferably, m is an integer from 3 to 6, R 2 Is C14-C16 alkyl.
The invention provides a preparation method of a foaming agent for oil-based drilling fluid, which comprises the following steps:
reacting an amino compound, an acid binding agent, an organic solvent and a fluorine-containing compound to obtain a reaction product;
and regulating the pH value of the reaction product to 4-6 to obtain the foaming agent for the oil-based drilling fluid.
Preferably, the amino compound is selected from one or more of N-dodecyl-1, 3-propylene diamine, N-tetradecyl-1, 3-propylene diamine, N-hexadecyl-1, 3-propylene diamine, N-octadecyl-1, 3-propylene diamine and N-oleyl-1, 3-propylene diamine.
Preferably, the acid binding agent is selected from one or more of pyridine and triethylamine.
Preferably, the organic solvent is selected from one or more of diethyl ether, dichloromethane and ethyl acetate.
Preferably, the fluorine-containing compound is selected from one or more of perfluorobutyryl chloride, perfluorohexanoyl chloride, perfluorooctanoyl chloride, perfluorobutylsulfonyl fluoride, perfluorohexylsulfonyl fluoride, perfluorooctylsulfonyl fluoride, perfluorobutylacetyl chloride, perfluorohexylacetyl chloride, perfluorooctylacetyl chloride, hexafluoropropylene oxide dimer and hexafluoropropylene oxide trimer.
Preferably, the pH value is adjusted by using hydrochloric acid solution.
Preferably, the amine-based compound, the acid-binding agent, the organic solvent and the fluorine-containing compound are used in an amount ratio of 1mol: (1-2) mol: (100-500) mL: (1-2) mol.
The invention provides an oil-based drilling fluid, which comprises the following components: the foaming agent for the oil-based drilling fluid or the foaming agent for the oil-based drilling fluid prepared by the method according to the technical scheme.
The foaming agent for the oil-based drilling fluid prepared by the method provided by the invention can obviously reduce the surface tension of diesel oil, has stronger foaming capacity and foam stability in the diesel oil, and can be used for preparing the oil-based foam drilling fluid.
Detailed Description
The following description of the technical solutions in the embodiments of the present invention will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other examples of modifications and alterations will be apparent to those skilled in the art based on the examples herein, and are intended to be within the scope of the invention. It should be understood that the embodiments of the present invention are only used for illustrating the technical effects of the present invention, and are not used for limiting the scope of the present invention. In the examples, the methods used are conventional methods unless otherwise specified.
The invention provides a foaming agent for oil-based drilling fluid, which has a structure shown in a formula I:
in the formula I, R 1 ＝C m F 2m+1 C n H 2n Or (b)
m is an integer of 3 to 8, n is an integer of 0 to 1, and x is an integer of 2 to 3;
R 2 is C12-C18 alkyl;
z is
In the present invention, m is preferably an integer of 4 to 6, more preferably 5.
In the present invention, the R 2 Preferably C12-C18 alkyl, more preferably C14-C16 alkyl, most preferably C15 alkyl.
The invention provides a preparation method of a foaming agent for oil-based drilling fluid, which comprises the following steps:
reacting an amino compound, an acid binding agent, an organic solvent and a fluorine-containing compound to obtain a reaction product;
and regulating the pH value of the reaction product to 4-6 to obtain the foaming agent for the oil-based drilling fluid.
In the present invention, the amine-based compound is preferably one or two selected from the group consisting of N-dodecyl-1, 3-propanediol, N-tetradecyl-1, 3-propanediol, N-hexadecyl-1, 3-propanediol, N-octadecyl-1, 3-propanediol and N-oleyl-1, 3-propanediol.
In the present invention, the acid-binding agent is preferably selected from one or more of pyridine and triethylamine.
In the present invention, the organic solvent is preferably selected from one or more of diethyl ether, methylene chloride and ethyl acetate.
In the present invention, the fluorine-containing compound is preferably one or more selected from perfluorobutyryl chloride, perfluorohexanoyl chloride, perfluorooctanoyl chloride, perfluorobutylsulfonyl fluoride, perfluorohexylsulfonyl fluoride, perfluorooctylsulfonyl fluoride, perfluorobutylacetyl chloride, perfluorohexylacetyl chloride, perfluorooctylacetyl chloride, hexafluoropropylene oxide dimer and hexafluoropropylene oxide trimer.
In the present invention, the amount ratio of the amine-based compound, the acid-binding agent, the organic solvent and the fluorine-containing compound is preferably 1mol: (1-2) mol: (100-500) mL: (1-2) mol, more preferably 1mol: (1.3 to 1.7) mol: (200-400) mL: (1.3 to 1.7) mol, most preferably 1mol:1.5mol:300mL:1.5mol.
In the present invention, the method of the reaction preferably comprises:
mixing an amino compound, an acid binding agent and an organic solvent, and then adding a fluorine-containing compound for reaction.
In the present invention, the temperature of the reaction is preferably 0 to 80 ℃, more preferably 10 to 70 ℃, more preferably 20 to 60 ℃, more preferably 30 to 50 ℃, most preferably 40 ℃; the reaction time is preferably 1 to 3 hours, more preferably 1.5 to 2.5 hours, and most preferably 2 hours.
In the present invention, the reaction preferably further comprises, after completion:
the obtained reaction product was filtered and dried.
In the present invention, the filtration is preferably a reduced pressure filtration.
In the present invention, the pH is preferably 4.5 to 5.5, most preferably 5.
In the invention, the pH value is preferably adjusted by adopting hydrochloric acid solution; the mass concentration of the hydrochloric acid solution is preferably 8 to 12%, more preferably 9 to 11%, and most preferably 10%.
The invention provides an oil-based drilling fluid, which comprises the following components: the foaming agent for the oil-based drilling fluid or the foaming agent for the oil-based drilling fluid prepared by the method according to the technical scheme.
The components of the oil-based drilling fluid are not particularly limited, and a person skilled in the art can select an oil-based drilling fluid with proper components according to actual situations, and the foaming agent for the oil-based drilling fluid can be added into the oil-based drilling fluid.
The foaming agent for the oil-based drilling fluid prepared by the method provided by the invention can obviously reduce the surface tension of diesel oil, has stronger foaming capacity and foam stability in the diesel oil, and can be used for preparing the oil-based foam drilling fluid.
Example 1
1mol of N-dodecyl-1, 3-propylene diamine, 1.5mol of pyridine and 200mL of methylene dichloride are added into a reactor and stirred uniformly, then 1.2mol of perfluorohexanoyl chloride is added into the reactor to react for 2 hours at 10 ℃, the mixture is filtered and dried under reduced pressure, and then the pH value of the product solution is adjusted to 5.2 by using a hydrochloric acid solution with the mass concentration of 10%, so that an oil-based foaming agent sample is obtained.
Example 2
1mol of N-octadecyl-1, 3-propylene diamine, 1mol of triethylamine and 400mL of ethyl acetate are added into a reactor and stirred uniformly, then 1mol of perfluorohexyl acetyl chloride is added into the reactor to react for 3 hours at 80 ℃, the mixture is filtered and dried under reduced pressure, and then the pH value of the product solution is regulated to 4.0 by using a hydrochloric acid solution with the mass concentration of 10% to obtain an oil-based foaming agent sample.
Example 3
1mol of N-hexadecyl-1, 3-propylene diamine, 2mol of triethylamine and 500mL of diethyl ether are added into a reactor and stirred uniformly, then 1.8mol of hexafluoropropylene oxide dimer is added into the reactor to react for 1h at 0 ℃, the mixture is filtered and dried under reduced pressure, and then the pH value of the product solution is regulated to 6.0 by using a hydrochloric acid solution with the mass concentration of 10% to obtain an oil-based foaming agent sample.
Examples 4 to 11
An oil-based foaming agent was prepared in the same manner as in example 1, except that the reaction materials and the amounts shown in Table 1 were used.
Table 1 reaction materials and usage amounts used in examples 4 to 11
Performance detection
The oil-based foaming agents prepared in examples 1 to 11 were subjected to performance evaluation.
(1) Surface tension
1.0g of the foaming agent for oil-based drilling fluid prepared in the example (SP-80 is used as a comparative example) was added to 100mL of diesel oil, and after the mixture was stirred uniformly, the surface tension of the diesel oil was measured by using a BZY-101 type surface tensiometer, and the measurement results are shown in Table 2.
Table 2 surface tension values of foaming agents for oil-based drilling fluids prepared in examples 1 to 11
| Examples | Surface tension value/(mN/m) in diesel oil |
| 1 | 21.0 |
| 2 | 19.8 |
| 3 | 20.5 |
| 4 | 21.7 |
| 5 | 19.0 |
| 6 | 19.2 |
| 7 | 19.5 |
| 8 | 18.6 |
| 9 | 21.4 |
| 10 | 23.6 |
| 11 | 17.8 |
| Diesel oil | 28.5 |
| Sorbitan fatty acid ester (SP-80) | 28.3 |
As can be seen from Table 2, the foaming agent for oil-based drilling fluids prepared according to the present invention can significantly lower the surface tension of diesel oil compared to general surfactants such as SP-80.
(2) Foaming Property
1g of SP-80 and the foaming agent sample for the oil-based drilling fluid prepared in the example are respectively dissolved in 100mL of diesel oil, and stirred for 3min at 10000r/min by a high-speed stirrer after being fully and uniformly dissolved, then the formed foam slurry is poured into a measuring cylinder, and the foam volume and the time for the foam slurry to separate out 50mL of foaming base fluid are recorded as the half-life of foam; the test results are shown in Table 3.
Table 3 evaluation of foaming agent properties for oil-based drilling fluids prepared in examples
As shown in Table 3, the conventional oil-soluble surfactant (such as SP-80) has poor foaming performance and foam stability, and the oil-based foaming agent prepared by the invention has good foaming performance and good foam stability in diesel oil.
The oil-based foaming agent prepared by the method provided by the invention can obviously reduce the surface tension of diesel oil, has stronger foaming capacity and foam stability in the diesel oil, and can be used for preparing oil-based foam drilling fluid.
While the invention has been described with respect to the preferred embodiments, it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention and are intended to be within the scope of the present invention.
Claims (10)
1. A foaming agent for oil-based drilling fluids, having the structure of formula I:
in the formula I, R 1 ＝C m F 2m+1 C n H 2n Or (b)
m is an integer of 3 to 8, n is an integer of 0 to 1, and x is an integer of 2 to 3;
R 2 is C12-C18 alkyl;
2. the foaming agent for oil-based drilling fluid according to claim 1, wherein m is an integer of 3 to 6, R 2 Is C14-C16 alkyl.
3. A method for preparing a foaming agent for oil-based drilling fluid, comprising the following steps:
reacting an amino compound, an acid binding agent, an organic solvent and a fluorine-containing compound to obtain a reaction product;
and regulating the pH value of the reaction product to 4-6 to obtain the foaming agent for the oil-based drilling fluid.
4. A method according to claim 3, wherein the amine-based compound is selected from one or more of N-dodecyl-1, 3-propanediol, N-tetradecyl-1, 3-propanediol, N-hexadecyl-1, 3-propanediol, N-octadecyl-1, 3-propanediol, and N-oleyl-1, 3-propanediol.
5. A method according to claim 3, wherein the acid binding agent is selected from one or more of pyridine and triethylamine.
6. A method according to claim 3, wherein the organic solvent is selected from one or more of diethyl ether, dichloromethane and ethyl acetate.
7. A method according to claim 3, wherein the fluorine-containing compound is selected from one or more of perfluorobutyryl chloride, perfluorohexanoyl chloride, perfluorooctanoyl chloride, perfluorobutylsulfonyl fluoride, perfluorohexylsulfonyl fluoride, perfluorooctylsulfonyl fluoride, perfluorobutylacetyl chloride, perfluorohexylacetyl chloride, perfluorooctylacetyl chloride, hexafluoropropylene oxide dimer and hexafluoropropylene oxide trimer.
8. A method according to claim 3, wherein the pH adjustment is performed using a hydrochloric acid solution.
9. A method according to claim 3, wherein the amine-based compound, acid-binding agent, organic solvent and fluorine-containing compound are used in a proportion of 1mol: (1-2) mol: (100-500) mL: (1-2) mol.
10. An oil-based drilling fluid comprising: the foaming agent for oil-based drilling fluid of claim 1 or the foaming agent for oil-based drilling fluid prepared by the method of claim 3.
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