CN110357794B - Preparation method of supercritical carbon dioxide thickening agent for exploitation of ultra-low permeability and ultra-low permeability oil and gas reservoir - Google Patents
Preparation method of supercritical carbon dioxide thickening agent for exploitation of ultra-low permeability and ultra-low permeability oil and gas reservoir Download PDFInfo
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Abstract
The invention relates to a preparation method of a supercritical carbon dioxide thickening agent for exploitation of an ultra-low permeability and ultra-low permeability oil-gas reservoir. The method can solve the problem that the conventional exploitation mode causes damage to the oil and gas reservoir. The technical scheme is as follows: putting the bottle into an ice water bath, adding perfluorooctyl ethanol, tosyl chloride and pyridine, reacting for 3 hours at 0-20 ℃, adding filter paper after the reaction is finished, dispersing for 1 hour by ultrasonic wave, removing the filter paper, and adding dilute hydrochloric acid to wash for 3-5 times to obtain an intermediate product (1); then adding (N-tert-butoxycarbonyl) trimethylolmethylamine and the intermediate product (1) into another bottle, adding potassium carbonate and N-N-dimethylformamide, and heating to 60 ℃ to react for 4 hours to obtain an intermediate product (2); and finally adding trifluoroacetic acid, dichloromethane and the intermediate product (2), reacting for 2 hours at 50 ℃, extracting, vacuum drying, adding 1, 6-hexamethylene diisocyanate, and reacting for 2 hours at 55 ℃ to obtain the final product. The thickening agent can increase the viscosity of carbon dioxide and can be used for fracturing modification and chemical flooding.
Description
Technical Field
The invention relates to an anhydrous fracturing fluid without water for developing an ultra-low permeability and ultra-low permeability oil and gas reservoir and a technology for improving the recovery ratio, in particular to a preparation method of a supercritical carbon dioxide thickening agent containing fluorine, belonging to the field of oil field chemicals.
Background
The ultra-low-permeability and ultra-low-permeability oil and gas reservoir has the characteristics of poor physical properties, low porosity and low permeability and the like, and generally shows very strong water sensitivity. Therefore, fracturing reformation and later enhanced recovery are effective ways to develop resources of ultra-low permeability hydrocarbon reservoirs. The conventional exploitation mode is easy to form water lock in the reservoir, and the permeability of the reservoir is reduced, so that the reservoir is damaged, and the fracturing yield-increasing effect is influenced. In order to solve the problem of damage to oil and gas reservoirs caused by conventional exploitation modes, people gradually turn the emphasis to waterless fracturing, and the waterless fracturing basically does not need water in the fracturing process. Therefore, the development of a non-aqueous fracturing technology without using water has important economic and social effects. The invention patents ZL201710416147.2 (a preparation method of a liquid carbon dioxide thickening agent) and ZL201710480823.2 (a preparation method of a supercritical carbon dioxide thickening agent) can be used as a fracturing fluid base fluid and a chemical oil displacement agent for improving recovery ratio in an ultra-low permeability and ultra-low permeability oil-gas reservoir, but the prepared carbon dioxide thickening agents have ester groups and can only be used under the conditions of lower temperature and less water. When the two thickeners act in an oil and gas reservoir with high temperature and active bottom water, the two thickeners have poor thermal stability and are easy to hydrolyze, so that the thickening capability is gradually reduced and even disappears. Based on the six-chain thickening agent containing ether bonds, the six-chain thickening agent is prepared, the viscosity of supercritical carbon dioxide can be improved, and the stability of the thickening agent can be improved.
Disclosure of Invention
The purpose of the invention is: aiming at the condition that the conventional exploitation mode is easy to cause damage to an oil gas reservoir, the preparation method of the supercritical carbon dioxide thickening agent for the exploitation of the ultra-low permeability oil gas reservoir is provided.
The invention provides a preparation method of a supercritical carbon dioxide thickening agent suitable for an ultra-low permeability and ultra-low permeability oil-gas reservoir, which comprises the following steps:
(1) preparation of p-toluene perfluorooctyl sulfonate: adding perfluorooctyl ethanol and p-toluenesulfonyl chloride into a three-necked bottle, wherein the molar ratio of the perfluorooctyl ethanol to the p-toluenesulfonyl chloride is 1:1.1-1.2, and finally adding pyridine and fully stirring. Keeping the temperature at 0-20 ℃, fully stirring, reacting for 3 hours, adding filter paper after the reaction is finished, dispersing for 1 hour by ultrasonic waves, removing unreacted p-toluenesulfonyl chloride, then removing the filter paper, washing for many times by using 15% dilute hydrochloric acid to remove pyridine to obtain a white solid, finally washing for many times by using distilled water, and drying for 3 hours in vacuum at 40 ℃ to obtain an intermediate product (1), namely p-toluene perfluorooctylsulfonate, as shown in formula I;
(I) toluene Perfluorooctyl sulfonate
(2) Preparation of (1, 2, 3-perfluorooctylethoxymethylene-4-carbamic acid tert-butyl ester) methane
Preparation of (1, 2, 3-perfluorooctylethoxymethylene-4-carbamic acid tert-butyl ester) methane: adding (N-tert-butoxycarbonyl) trimethylolmethylamine and p-toluene perfluorooctylsulfonate into a three-necked bottle, adding potassium carbonate and N, N-dimethylformamide into the three-necked bottle, wherein the ratio of (N-tert-butoxycarbonyl) trimethylolmethylamine to p-toluene perfluorooctylsulfonate is 3.1-3.2:1, fully stirring, heating to 60 ℃ to react for 4 hours, washing the mixture for multiple times by using distilled water after the reaction is finished, and drying in vacuum to obtain an intermediate product (2), namely (1, 2, 3-perfluorooctylethoxymethylene-4-tert-butyl carbamate) methane, wherein the structure of the intermediate product is shown as a formula II.
(II) (tert-butyl 1, 2, 3-perfluorooctylethoxymethylene-4-carbamate) methane (3) final product { [1, 6-bis [ (1, 2, 3-perfluorooctylethoxymethylene) methylureido group]Preparation of hexane: adding a mixed solution of dichloromethane and trifluoroacetic acid into a three-necked bottle, wherein the volume ratio of the dichloromethane to the trifluoroacetic acid is 2: 1; adding 1, 2, 3-perfluorooctylethoxymethylene-4-tert-butyl carbamate) methane into the mixed solution, reacting at constant temperature of 50 ℃ for 2 hours, adding di (tert-butyl) carbonateExtracting with chloromethane for 3 times to obtain organic layer, anhydrous Na2SO4Drying the organic layer, adding 1-6-isocyanate, reacting 1, 6-hexamethylene diisocyanate and (1, 2, 3-perfluorooctylethoxymethylene-4-tert-butyl carbamate) methane at a molar ratio of 1:2.05-2.10 at 55 ℃ for 2 hours, washing the crude product with a mixed solvent of ethyl acetate and benzene for multiple times, filtering, and drying in vacuum to obtain the final product { [1, 6-bis [ (1, 2, 3-perfluorooctylethoxymethylene) methylureido group]And (4) hexane, the structure of which is shown in the formula III.
(III) { [1, 6-bis [ (1, 2, 3-perfluorooctylethoxymethylene) methylureido ] } Hexane
The invention has the advantages and beneficial effects that: the fluorine-containing chain segment is introduced into the thickening agent, so that the pressure required by dissolving the thickening agent in carbon dioxide can be effectively reduced, and the dissolving condition of the thickening agent in the carbon dioxide is improved. Meanwhile, hydrogen bonds existing among molecules of the thickening agent and entanglement among molecular chains can effectively increase the viscosity of the carbon dioxide. The thickening agent is connected with the carbon dioxide-philic group and the hydrogen bond crosslinking association group by an ether bond instead of an ester bond, so that the thermal stability and the hydrolytic stability of the thickening agent are effectively improved, and the thickening agent can be applied to the exploitation of the ultra-low permeability and ultra-low permeability oil and gas reservoirs with active bottom water.
Method for testing viscosity of thickener: firstly, the thickening agent is added into a high-temperature high-pressure closed system of a rheometer HAAKE MARS according to the addition amount, a matching device of the high-temperature high-pressure closed system is installed, and air in the closed system is exhausted by using a vacuum pump. Then introducing supercritical carbon dioxide through a sample introduction valve of a high-temperature high-pressure closed system, simultaneously adjusting the rotation of an inner rotor in the system to fully and uniformly mix carbon dioxide serving as a thickening agent, adjusting the pressure and the temperature of the system when the carbon dioxide is introduced to be metered to enable the carbon dioxide in the system to reach a required state, stirring and uniformly mixing to complete the preparation of a mixed system, and finally, starting a rheometer, and testing the viscosity of the mixed system after setting experiment parameters.
Detailed Description
The present invention is illustrated below by way of examples, but the content of the present invention is not limited to the following examples.
Example 1
(1) Preparation of p-toluene perfluorooctyl sulfonate: adding perfluorooctyl ethanol and p-toluenesulfonyl chloride into a three-necked bottle, wherein the molar ratio of the perfluorooctyl ethanol to the p-toluenesulfonyl chloride is 1:1.1, and finally adding pyridine and fully stirring. Keeping the temperature at 0 ℃, fully stirring, reacting for 3 hours, adding filter paper after the reaction is finished, dispersing for 1 hour by ultrasonic wave, removing unreacted p-toluenesulfonyl chloride, then removing the filter paper, washing for 3 times by using 15% dilute hydrochloric acid to remove pyridine to obtain a white solid, finally washing for 5 times by using distilled water, and drying for 3 hours in vacuum at 40 ℃ to obtain the intermediate product (1), namely the p-toluene perfluorooctylsulfonate.
(2) Preparation of (1, 2, 3-perfluorooctylethoxymethylene-4-carbamic acid tert-butyl ester) methane: adding (N-tert-butoxycarbonyl) serine alcohol and p-toluene perfluorooctyl sulfonate into a three-necked bottle, adding potassium carbonate and N, N-dimethylformamido into the three-necked bottle, fully stirring the mixture, heating the mixture to 60 ℃ for reaction for 4 hours, washing the mixture for 5 times by using distilled water after the reaction is finished, and drying the mixture in vacuum to obtain an intermediate product (2) - (1, 3-perfluorooctylethanol propyl ether-2-tert-butyl carbamate) propane.
(3) The final product { [1, 6-bis [ (1, 2, 3-perfluorooctylethoxymethylene) methylureido]Preparation of hexane: adding a mixed solution of dichloromethane and trifluoroacetic acid into a three-necked bottle, wherein the volume ratio of the dichloromethane to the trifluoroacetic acid is 2: 1; adding (1, 2, 3-perfluorooctylethoxymethylene-4-tert-butyl carbamate) methane into the mixed solution, reacting at constant temperature of 50 ℃ for 2 hours, adding dichloromethane, and extracting for 3 times to obtain an organic layer, wherein the anhydrous Na2SO4Drying the organic layer, adding 1, 6-diisocyanatohexane, 1, 6-diisocyanatohexane and 1, 3-perfluorooctylethanolpropylether-2-tert-butyl carbamate) propane at a molar ratio of 1:2.05, reacting at 55 deg.C for 2 hr, washing the crude product with a mixed solvent of ethyl acetate and benzene for 4 times, and filteringFiltering and drying in vacuum to finally obtain the final product { [1, 6-bis [ (1, 2, 3-perfluorooctylethoxymethylene) methylureido]Hexane.
Respectively adding the 1wt%, 2wt% and 3wt% of supercritical carbon dioxide thickening agents into a high-temperature high-pressure closed system provided with a matched device; respectively introducing 99wt%, 98wt% and 97wt% of supercritical carbon dioxide into the closed system through an injection valve. Rotating the rotor, adjusting the pressure and temperature of the system, fully stirring to completely dissolve the thickening agent, and completing the preparation of the mixed system; starting the rheometer again, setting the pressure value at 29MPa and the temperature at 60 ℃, and keeping the shear rate at 100s in the experiment-1The viscosity values of the mixed system were measured to be 5.89 mPas, 6.24 mPas and 7.89 mPas, respectively; respectively 147.3 times, 156.0 times and 197.3 times of the viscosity of the non-thickened supercritical carbon dioxide.
Example 2
(1) Preparation of p-toluene perfluorooctyl sulfonate: adding perfluorooctyl ethanol and p-toluenesulfonyl chloride into a three-necked bottle, wherein the molar ratio of the perfluorooctyl ethanol to the p-toluenesulfonyl chloride is 1:1.2, and finally adding pyridine and fully stirring. Keeping the temperature at 20 ℃, fully stirring, reacting for 3 hours, adding filter paper after the reaction is finished, dispersing for 1 hour by ultrasonic wave, removing unreacted p-toluenesulfonyl chloride, then removing the filter paper, washing for 4 times by 15% diluted hydrochloric acid to remove pyridine to obtain a white solid, finally washing for 4 times by distilled water, and drying for 3 hours in vacuum at 40 ℃ to obtain the intermediate product (1), namely the p-toluene perfluorooctylsulfonate.
(2) Preparation of (1, 2, 3-perfluorooctylethoxymethylene-4-carbamic acid tert-butyl ester) methane: adding (N-tert-butoxycarbonyl) serine alcohol and p-toluene perfluorooctyl sulfonate into a three-necked bottle, adding potassium carbonate and N, N-dimethylformamido into the three-necked bottle, fully stirring the mixture, heating the mixture to 60 ℃ for reaction for 4 hours, washing the mixture for 4 times by using distilled water after the reaction is finished, and drying the mixture in vacuum to obtain an intermediate product (2), namely (1, 2, 3-perfluorooctylethoxymethylene-4-tert-butyl carbamate) methane.
(3) The final product { [1, 6-bis [ (1, 2, 3-perfluorooctylethoxymethylene) methylureaBase of]Preparation of hexane: adding a mixed solution of dichloromethane and trifluoroacetic acid into a three-necked bottle, wherein the volume ratio of the dichloromethane to the trifluoroacetic acid is 2: 1; adding (1, 2, 3-perfluorooctylethoxymethylene-4-tert-butyl carbamate) methane into the mixed solution, reacting at constant temperature of 50 ℃ for 2 hours, adding dichloromethane, and extracting for 3 times to obtain an organic layer, wherein the anhydrous Na2SO4Drying the organic layer, adding 1, 6-diisocyanic acid ester, reacting 1, 6-hexamethylene diisocyanate and 1, 3-perfluorooctylethanol propyl ether-2-tert-butyl carbamate) propane at a molar ratio of 1:2.1 at 55 ℃ for 2 hours, washing the crude product with a mixed solvent of ethyl acetate and benzene for 4 times, filtering, and drying in vacuum to obtain the final product { [1, 6-bis [ (1, 2, 3-perfluorooctylethoxy methylene) methylureido group]Hexane.
Respectively adding the 1wt%, 2wt% and 3wt% of supercritical carbon dioxide thickening agents into a high-temperature high-pressure closed system provided with a matched device; respectively introducing 99wt%, 98wt% and 97wt% of supercritical carbon dioxide into the closed system through an injection valve. Rotating the rotor, adjusting the pressure and temperature of the system, fully stirring to completely dissolve the thickening agent, and completing the preparation of the mixed system; starting the rheometer again, setting the pressure value to be 29MPa and the temperature to be 60 ℃, and keeping the shear rate to be 100s in the experiment-1The viscosity values of the mixed system were measured to be 5.85 mPas, 6.76 mPas and 7.82 mPas, respectively; respectively 146.3 times, 169.0 times and 195.5 times of the viscosity of the non-thickened supercritical carbon dioxide.
Example 3
(1) Preparation of p-toluene perfluorooctyl sulfonate: adding perfluorooctyl ethanol and p-toluenesulfonyl chloride into a three-necked bottle, wherein the molar ratio of the perfluorooctyl ethanol to the p-toluenesulfonyl chloride is 1:1.15, and finally adding pyridine and fully stirring. Keeping the temperature at 10 ℃, fully stirring, reacting for 3 hours, adding filter paper after the reaction is finished, dispersing for 1 hour by ultrasonic wave, removing unreacted p-toluenesulfonyl chloride, then removing the filter paper, washing for 5 times by 15% diluted hydrochloric acid to remove pyridine to obtain white solid, finally washing for 5 times by distilled water, and drying for 3 hours in vacuum at 40 ℃ to obtain an intermediate product (1), namely p-toluene perfluorooctylsulfonate
(2) Preparation of (1, 2, 3-perfluorooctylethoxymethylene-4-carbamic acid tert-butyl ester) methane: adding (N-tert-butoxycarbonyl) serine alcohol and p-toluene perfluorooctyl sulfonate into a three-necked bottle, adding potassium carbonate and N, N-dimethylformamido into the three-necked bottle, fully stirring the mixture, heating the mixture to 60 ℃ for reaction for 4 hours, washing the mixture for 4 times by using distilled water after the reaction is finished, and drying the mixture in vacuum to obtain an intermediate product (2), namely (1, 2, 3-perfluorooctylethoxymethylene-4-tert-butyl carbamate) methane.
(3) The final product { [1, 6-bis [ (1, 2, 3-perfluorooctylethoxymethylene) methylureido]Preparation of hexane: adding a mixed solution of dichloromethane and trifluoroacetic acid into a three-necked bottle, wherein the volume ratio of the dichloromethane to the trifluoroacetic acid is 2: 1; adding (1, 2, 3-perfluorooctylethoxymethylene-4-tert-butyl carbamate) methane into the mixed solution, reacting at constant temperature of 50 ℃ for 2 hours, adding dichloromethane, and extracting for 3 times to obtain an organic layer, wherein the anhydrous Na2SO4Drying the organic layer, adding 1, 6-diisocyanic acid ester, reacting 1, 6-hexamethylene diisocyanate and 1, 3-perfluorooctylethanol propyl ether-2-tert-butyl carbamate) propane at a molar ratio of 1:2.1 at 55 ℃ for 2 hours, washing the crude product with a mixed solvent of ethyl acetate and benzene for 5 times, filtering, and drying in vacuum to obtain the final product { [1, 6-bis [ (1, 2, 3-perfluorooctylethoxy methylene) methylureido group]Hexane.
Respectively adding the 1wt%, 2wt% and 3wt% of supercritical carbon dioxide thickening agents into a high-temperature high-pressure closed system provided with a matched device; respectively introducing 99wt%, 98wt% and 97wt% of supercritical carbon dioxide into the closed system through an injection valve. Rotating the rotor, adjusting the pressure and temperature of the system, fully stirring to completely dissolve the thickening agent, and completing the preparation of the mixed system; starting the rheometer again, setting the pressure value to be 29MPa and the temperature to be 60 ℃, and keeping the shear rate to be 100s in the experiment-1The viscosity values of the mixed system were measured to be 6.43 mPas, 6.97 mPas and 7.45 mPas, respectively; 160.8 times, 174.3 times and 186.3 times the viscosity of the non-thickened supercritical carbon dioxide, respectively.
Claims (2)
1. A preparation method of a supercritical carbon dioxide thickening agent for oil and gas reservoir exploitation is characterized by comprising the following steps:
(1) preparation of intermediate 1: adding perfluorooctyl ethanol and p-toluenesulfonyl chloride into a three-necked bottle, wherein the molar ratio of the perfluorooctyl ethanol to the p-toluenesulfonyl chloride is 1:1.1-1.2, and finally adding pyridine and fully stirring; keeping the temperature at 0-20 ℃, fully stirring, reacting for 3 hours, adding filter paper after the reaction is finished, dispersing for 1 hour by ultrasonic wave, removing unreacted paratoluensulfonyl chloride, then removing the filter paper, washing for many times by using 15% dilute hydrochloric acid to remove pyridine to obtain a white solid, finally washing for many times by using distilled water, and drying for 3 hours in vacuum at 40 ℃ to obtain an intermediate product 1, wherein the structural formula of the intermediate product 1 is as follows:
(2) preparation of intermediate 2: adding (N-tert-butoxycarbonyl) trimethylolmethylamine and an intermediate product 1 into a three-necked bottle, wherein the molar ratio of the (N-tert-butoxycarbonyl) trimethylolmethylamine to the intermediate product 1 is 3.1-3.2:1, adding potassium carbonate and N, N-dimethylformamide, fully stirring, heating to 60 ℃ for reacting for 4 hours, washing with distilled water for multiple times after the reaction is finished, and drying in vacuum to obtain an intermediate product 2, wherein the structural formula of the intermediate product 2 is shown as follows:
(3) preparation of the final product: adding a mixed solution of dichloromethane and trifluoroacetic acid into a three-necked bottle, wherein the volume ratio of the dichloromethane to the trifluoroacetic acid is 2: 1; adding intermediate product 2 into the above mixed solution, reacting at constant temperature of 50 deg.C for 2 hr, adding dichloromethane, extracting for 3 times to obtain organic layer, and extracting with anhydrous Na2SO4Drying the organic layer, adding 1, 6-hexamethylene diisocyanate, the molar ratio of 1, 6-hexamethylene diisocyanate to intermediate product 2 is 1:2.05-2.10, reacting at 55 deg.C for 2 hr, reacting with acetic acidWashing the crude product for many times by using a mixed solvent of ethyl ester and benzene, filtering, and drying in vacuum to finally obtain a final product, wherein the structural formula of the final product is as follows:
2. the use of a supercritical carbon dioxide thickener for hydrocarbon reservoirs as defined in claim 1 wherein: respectively adding the 1wt%, 2wt% and 3wt% of supercritical carbon dioxide thickening agents into a high-temperature high-pressure closed system provided with a matched device; respectively introducing 99wt%, 98wt% and 97wt% of supercritical carbon dioxide into the closed system through a sample injection valve; rotating the rotor, adjusting the pressure and temperature of the system, fully stirring to completely dissolve the thickening agent, and completing the preparation of the mixed system; starting a rheometer, setting the pressure value to be 29MPa and the temperature to be 60 ℃, and determining that the viscosity value of the mixed system is increased by 146-197 times compared with the viscosity of the non-thickened supercritical carbon dioxide.
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