CN112940140A

CN112940140A - Method for preparing super-air-wet nano microcrystalline cellulose by one-step method and application

Info

Publication number: CN112940140A
Application number: CN202110130130.7A
Authority: CN
Inventors: 王彦玲; 李永飞; 汤龙浩; 张传保; 兰金城; 许宁; 孟令韬; 蒋保洋
Original assignee: China University of Petroleum East China
Current assignee: China University of Petroleum East China
Priority date: 2021-01-29
Filing date: 2021-01-29
Publication date: 2021-06-11
Anticipated expiration: 2041-01-29
Also published as: CN112940140B

Abstract

The invention relates to a method for preparing super-air-wet nano microcrystalline cellulose by a one-step method and application thereof. Dispersing nano microcrystalline cellulose particles in a mixed solvent of water and an alcohol solvent to obtain a dispersion liquid; slowly dripping surfactant N-perfluorooctanoyl-N-aminoethyl propionic acid or perfluoroalkyl sulfonyl fluoride into the dispersion liquid in the presence of a catalyst, and reacting for 3-10h at 50-70 ℃ to obtain the super-air-wet nano microcrystalline cellulose. The invention realizes the one-step preparation of the super-gas-wet nano microcrystalline cellulose, and solves the problems of long time consumption, high cost, complex process, difficult mass production and the like of the traditional method. The nano microcrystalline cellulose has super-gas-wet performance, and when the nano microcrystalline cellulose is applied to condensate gas reservoir collection, the liquid-wet property of the surface of the rock core can be reversed into the super-gas-wet property, namely, the contact angle of water and oil on the surface of the rock core is larger than or equal to 150 degrees, the wettability of a near-wellbore area is improved, the relative permeability is improved, and the seepage capacity of fluid in the near-wellbore area is enhanced.

Description

Method for preparing super-air-wet nano microcrystalline cellulose by one-step method and application

Technical Field

The invention relates to a method for preparing super-gas-wet nano microcrystalline cellulose by a one-step method and application, belonging to the technical field of petrochemical industry for improving yield increase of a gas reservoir.

Background

At present, the yield of domestic oil fields is not optimistic, a plurality of large oil fields discovered at the earliest enter the middle and later stages basically, the number of newly discovered ultra-large oil and gas fields is reduced, and the total yield is in a descending trend. In the future, the oil and gas supply chain increasingly depends on unconventional oil and gas resources, and the unconventional oil and gas reserves are abundant, are important components in the oil and gas industry and are growing points for realizing the rapid increase of oil and gas yield. China also makes a lot of deployments and plans on the development and commercialization of unconventional oil and gas resources, and aims to further effectively relieve the supply pressure excessively depending on imported oil and gas through the full development and utilization of the unconventional oil and gas resources, so that the energy safety is guaranteed. Condensate gas reservoirs are an important component of oil and gas resources and are abundant in reserves, however, in the development process, when the bottom hole pressure is lower than the dew point pressure of the gas phase, the gas phase can be condensed into a liquid phase and is gathered in an area near a shaft, so that the permeability near the shaft is reduced, and the productivity of a gas well is seriously reduced. Gas-wet reversal is one of effective methods for solving the problem, and can obviously enhance the seepage capability of fluid in the area near the well bore and improve the yield of the condensate gas reservoir. Chinese patent document CN201410083943.5 provides a method for realizing gas-moisture reversal of the surface of a rock core by using a mixed fluorocarbon surfactant treating agent, which respectively comprises 0.05-0.3% of nonylphenol polyoxyethylene ether, an amphoteric surfactant and a hydrocarbon surfactant, and can reverse the wettability of the surface of the rock core from liquid-moisture to neutral gas-moisture only, so that the method is not well suitable for low-permeability oil-gas reservoirs. Chinese patent document CN201510055967.4 discloses a fluorine-containing amphiphilic block polymer gas-moisture reversal agent, which is prepared by emulsion polymerization, has obvious hydrophobicity and oleophobicity and excellent film forming property, and can be tightly combined with an oil-gas reservoir porous medium. However, the emulsion polymer has poor solubility, complex process, no feasibility of batch production and field application, and limited gas-wet reversal effect. Chinese patent document CN201110353364.4 discloses a system composed of a cationic fluorocarbon surfactant FC911, cetyl trimethyl ammonium bromide and water, which can reverse the wettability of the core surface from liquid-wet to neutral-gas-wet, but this method is large in amount, complicated in preparation steps, poor in effect, and difficult to popularize on site.

In summary, in the prior art, the surface of the core is only reversed from the original liquid-wet state to the gas-wet state through a chemical agent, and the super gas-wet state is not achieved, and the product has the advantages of complex process, large using amount, short effective period, complex preparation steps, poor effect and difficulty in field popularization.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a method for preparing super-air-wet nano microcrystalline cellulose by a one-step method and application thereof, solves the problems of long time consumption, complex process and large dosage of the traditional method, and overcomes the problems of difficult volume production and toxic solvent use in the preparation process. The method is simple and easy to implement, high in efficiency, uniform in distribution and easy for mass production.

The technical scheme of the invention is as follows:

the method for preparing the super-air-wet nano microcrystalline cellulose by the one-step method comprises the following steps:

dispersing the nano microcrystalline cellulose particles in a mixed solvent of water and an alcohol solvent to obtain a dispersion liquid; slowly dripping surfactant N-perfluorooctanoyl-N-aminoethyl propionic acid or perfluoroalkyl sulfonyl fluoride into the dispersion liquid in the presence of a catalyst, and reacting for 3-10h at 50-70 ℃ to obtain the super-air-wet nano microcrystalline cellulose.

Preferably, according to the invention, the nanocrystalline cellulose has a particle size of 50 to 100 nm.

According to the invention, the dispersing adopts ultrasonic dispersing, and the time of ultrasonic dispersing is 30-40 min.

Preferably according to the invention, the alcoholic solvent is ethanol, glycerol or ethylene glycol; further preferably, the alcohol solvent is ethanol.

According to the invention, the mass ratio of water to alcohol solvent in the mixed solvent is (8-20): 1; further preferably, the mass ratio of water to the alcohol solvent in the mixed solvent is 10: 1.

According to the invention, the mass ratio of the nano microcrystalline cellulose to the mixed solvent is 1 (30-100); further preferably, the mass ratio of the nanocrystalline cellulose to the mixed solvent is 1: 50.

Preferably, according to the invention, the catalyst is triethylamine, 1, 2-dimethylpropylamine or trioctylamine; further preferably, the catalyst is triethylamine.

According to the invention, the mass ratio of the catalyst to the nano microcrystalline cellulose is 1 (10-50); further preferably, the mass ratio of the catalyst to the nanocrystalline cellulose is 1: 20.

Preferably, according to the invention, the surfactant is N-perfluorooctanoyl-N-aminoethylpropionic acid.

Preferably, according to the invention, the perfluoroalkanesulfonyl fluoride is perfluorobutanesulfonyl fluoride, perfluorohexanesulfonyl fluoride or perfluorooctanesulfonyl fluoride.

According to the invention, the mass ratio of the nano microcrystalline cellulose to the surfactant is 1 (2-5).

According to the invention, the dropping speed of the slow dropping is preferably 1-2 mL/min; further preferably, the dropping rate of the slow dropping is 1.2 mL/min.

According to the invention, the reaction conditions are preferably 60 ℃ for 4 hours.

The super-air-wet nano microcrystalline cellulose is prepared according to the method.

The application of the super-gas-wet nano microcrystalline cellulose in gas condensate storage and recovery.

The invention has the following beneficial effects:

(1) the invention realizes the one-step preparation of the super-gas-wet nano microcrystalline cellulose, and solves the problems of long time consumption, high cost, complex process, difficult mass production, toxic organic solvent and the like of the traditional method.

(2) The nanocrystalline cellulose provided by the invention has super-gas-wet performance, and when the nanocrystalline cellulose is applied to the recovery of a condensate gas reservoir, the liquid-wet property of the surface of a rock core can be reversed into super-gas-wet property, namely, the contact angle of water and oil on the surface of the rock core is more than or equal to 150 degrees, the wettability of a region near a shaft can be improved, the relative permeability can be improved, the seepage capability of fluid in the region near the shaft can be enhanced, and the recovery ratio of the condensate gas reservoir can be improved.

(3) The surface of the nano microcrystalline cellulose is rich in a large amount of hydroxyl, and the N-perfluorooctanoyl-N-aminoethyl propionic acid used as the surfactant contains a large amount of carboxyl, and is subjected to esterification reaction with the hydroxyl on the surface of the nano microcrystalline cellulose in the presence of a catalyst, so that the N-perfluorooctanoyl-N-aminoethyl propionic acid as the surfactant is attached to the surface of the nano microcrystalline cellulose to form the super-air-wet material. In the presence of a catalyst, a surfactant perfluoroalkyl sulfonyl fluoride is activated, and the activated sulfonyl fluoride in the perfluoroalkyl sulfonyl fluoride and hydroxyl on the surface of the nano microcrystalline cellulose are subjected to acylation reaction to form the super-air-moisture material. The solvent is a mixture of water and an alcohol solvent, is a nontoxic and harmless material, has low cost, can be produced in large quantity, and is beneficial to on-site popularization and application.

(4) The method can control the particle size of the nano microcrystalline cellulose particles according to requirements, and can be effectively applied to development of low permeability reservoirs.

Drawings

FIG. 1 is an infrared spectrum of the super gas wet nano-microcrystalline cellulose prepared in example 1; in the figure, the upper curve is super-air-wet nanocrystalline cellulose, and the lower curve is nanocrystalline cellulose.

Fig. 2 is an XPS spectrum of the super gas-wet nano-microcrystalline cellulose prepared in example 1.

Fig. 3 is a line graph of the contact angle of water and oil on the surface of the core as a function of the super-air-wet nanocrystalline cellulose concentration.

Fig. 4 is a graph of the self-priming capacity of the core as a function of time before and after treatment with super-wet nanocrystalline cellulose.

FIG. 5 is a line graph of liquid rise in a capillary as a function of super-air-wet nanocrystalline cellulose concentration.

Fig. 6 is a graph showing the effect of super-air-wet nanocrystalline cellulose on the pressure required for water or oil injection into a core.

Fig. 7 shows the effect of super-air-wet nanocrystalline cellulose on different core permeabilities.

Detailed Description

The present invention will be described in more detail with reference to examples, which are not intended to limit the scope of the present invention, but are commercially available. In the examples, "%" is a mass percentage unless otherwise specified.

The raw material of nanocrystalline cellulose used in the examples was sold by cheng xing biotechnology limited, hannan, and had a particle size of 60 nm.

Example 1

firstly, dispersing 1.1g of nano microcrystalline cellulose particles (with the particle size of 60nm) in a mixed solvent consisting of 50g of water and 5g of ethanol, and performing ultrasonic dispersion for 30min to obtain a dispersion liquid; 0.055g triethylamine is added as a catalyst, 3.3g surfactant N-perfluorooctanoyl-N-aminoethyl propionic acid is dripped into the dispersion liquid at the speed of 1.2mL/min, and the temperature is raised to 60 ℃ for reaction for 4 hours, thus obtaining the super-air-wet nano microcrystalline cellulose.

The prepared super-gas-wet nano microcrystalline cellulose has an infrared spectrum as shown in figure 1 and an XPS spectrum as shown in figure 2.

As can be seen from FIG. 1, 3338cm^-1The near characteristic peak is caused by the stretching vibration of hydroxyl on the surface of the nano microcrystalline cellulose, the overall position and distribution of the peak are not obviously changed before and after modification, but the width of the modified peak is narrower than that before modification, and the strength is weaker, which shows that the quantity of the hydroxyl on the surface of the modified nano microcrystalline cellulose is reduced, mainly because the surfactant N-perfluorooctanoyl-N-aminoethyl propionic acid and the surfactant N-perfluorooctanoyl-N-aminoethyl propionic acid have esterification reactionWhile part of the hydroxyl groups are consumed. The modified infrared spectrum shows a new absorption peak 1734cm^-1This is caused by stretching and vibrating of an ester group (-COO) formed by the esterification reaction.

As can be seen from FIG. 2, the modified nanocrystalline cellulose has six C atom combinations, which are respectively assigned to C-C (284.39eV), C-N (285.43eV), C-O (286.04eV), O ═ C-O (288.84eV), -CF₂- (291.04eV) and-CF₃(293.39eV), indicating that the nano microcrystalline cellulose and the surfactant have esterification reaction.

Example 2

firstly, dispersing 1.1g of nano microcrystalline cellulose particles (with the particle size of 60nm) in a mixed solvent consisting of 60g of water and 6g of ethanol, and performing ultrasonic dispersion for 40min to obtain a dispersion liquid; 0.11g of 1, 2-dimethylpropylamine is added as a catalyst, 4.4g of surfactant N-perfluorooctanoyl-N-aminoethyl propionic acid is dripped into the dispersion at the speed of 1.5mL/min, and the temperature is raised to 60 ℃ for reaction for 5 hours, so that the super-air-wet nano microcrystalline cellulose is obtained.

Example 3

firstly, dispersing 1.1g of nano microcrystalline cellulose particles (with the particle size of 60nm) in a mixed solvent consisting of 60g of water and 6g of glycol, and performing ultrasonic dispersion for 40min to obtain dispersion liquid; 0.11g of trioctylamine is added as a catalyst, 4.4g of surfactant perfluorohexyl sulfonyl fluoride is dripped into the dispersion liquid at the speed of 1.7mL/min, and the temperature is raised to 60 ℃ for reaction for 5 hours, thus obtaining the super-air-wet nano microcrystalline cellulose.

Example 4

The contact angle of water and oil on the surface of the rock core is changed along with the concentration of the super-air-wet nano microcrystalline cellulose solution.

First, the ultra-gas-wet nano-microcrystalline cellulose prepared in example 1 was prepared into aqueous solutions of 0.1%, 0.3%, 0.5%, 0.7%, 0.9%, and 1.2%; secondly, polishing the rock core by using sand paper with different meshes, and soaking the rock core in the super-air-wet nano microcrystalline cellulose solution with different concentrations for aging for 24 hours; then, drying at 100 ℃; finally, the contact angles of water and oil on the surface of the core were magnified on a measuring instrument device and photographed with an optical camera under a suitable light source, and the magnitude of the contact angle was calculated by software, and the results are shown in fig. 3.

As can be seen from fig. 3, the core had strong liquid wettability without treatment, and the wettability of the core surface was changed after treatment with the super-gas-wet nanocrystalline cellulose solution; along with the increase of the concentration of the super-gas-wet nano microcrystalline cellulose solution, the contact angle of the water phase and the oil phase on the surface of the rock core is continuously increased; when the concentration is 0.3%, the contact angles reach the maximum values of 154 degrees and 152 degrees respectively, which indicates that the surface of the core is changed from liquid wettability to super-gas wettability, and the wetting reversal is realized. The contact angles of the water phase and the oil phase do not change obviously with the continuous increase of the concentration, a gas-wet molecular layer is probably formed on the surface of the core, and the adsorption amount on the surface of the core reaches saturation with the continuous increase of the concentration, so the contact angles of the water phase and the oil phase are kept basically constant.

Example 5

The super-gas-wet nano-microcrystalline cellulose prepared in the example 2 is taken and prepared into water solutions with different concentrations, after the core is soaked in the water solutions and aged for 24 hours, the contact angle of water and oil on the surface of the core is detected along with the change of the concentration of the super-gas-wet nano-microcrystalline cellulose solution, the detection method is the same as that in the example 4, and the results show that the maximum contact angles of the water and the oil on the surface of the core are 153 degrees and 150 degrees respectively, so that the super-gas-wet conversion of the surface of the core is realized.

Example 6

The super-gas-wet nano-microcrystalline cellulose prepared in the example 3 is taken and prepared into water solutions with different concentrations, after the core is soaked in the water solutions and aged for 24 hours, the contact angle of water and oil on the surface of the core is detected along with the change of the concentration of the super-gas-wet nano-microcrystalline cellulose solution, the detection method is the same as that in the example 4, the results show that the maximum contact angles of the water and the oil on the surface of the core are 150 degrees and 150 degrees respectively, and the super-gas-wet conversion of the surface of the core is realized.

Example 7

Under optimal concentration conditions (0.3%), the amount of water and oil adsorbed in the core varied with time.

Firstly, the rock core is divided into two groups, one group is placed in 0.3 percent super-air-wet nano microcrystalline cellulose aqueous solution of example 1 for aging for 24 hours and drying for standby application, and the other group is soaked in deionized water for 24 hours as a blank control; secondly, taking two identical beakers and containing water or oil with the same volume, vertically suspending the rock core below an electronic balance, and adjusting a lifter to enable the liquid level to slowly contact the bottom of the rock core; the electronic balance reading is then immediately cleared and the recording of the change in the amount of adsorption over time is started until the reading is constant. For more accurate data, the liquid level and the bottom of the core are always kept in a right contact state. The results are shown in FIG. 4.

As can be seen from FIG. 4, the self-absorption of water and oil in the core was 2.86g and 3.16g, respectively, before the ultra-wet nanocrystalline cellulose treatment; after the treatment of the super-gas-wet nano microcrystalline cellulose, the self-absorption amounts of water and oil in the rock core are respectively reduced to 0.68g and 0.94g, the reduction amplitude is close to 75%, and the flow capacity of fluid in a reservoir is obviously improved, so that the recovery yield is improved.

Example 8

The rising height of the liquid in the capillary varies with the concentration of the super-air-wet nanocrystalline cellulose solution.

The capillary simulates a formation fracture, and the rise height of the liquid in the capillary is directly related to the wettability of the inner wall of the capillary. First, the capillary tube was cleaned and dried at 100 ℃ for 2 hours; next, the clean capillaries were aged in 0.1%, 0.3%, 0.5%, 0.7% and 0.9% aqueous solutions of the super-air-wet nano-microcrystalline cellulose of example 1 for 24 hours and dried to remove excess solution; finally, the aged and dried capillary tubes were inserted vertically into water or oil and the rise height was recorded and the results are shown in FIG. 5.

As can be seen from FIG. 5, after the treatment of the super-air-wet nano-microcrystalline cellulose, the height of the water in the capillary tube is reduced from 28mm to-13 mm along with the increase of the concentration of the super-air-wet nano-microcrystalline cellulose solution, and then the water is basically kept unchanged, and the larger the general height difference is, the stronger the air-wet property of the inner wall of the capillary tube is; the oil has the same tendency in the capillary. The results prove that the inner wall of the capillary tube is inverted from liquid-wet property to super-air-wet property, the phenomena of liquid lock effect and the like can be obviously eliminated, and the flowing capacity of the fluid in the flowing channel is finally improved.

Example 9

The effect of super-air-wet nanocrystalline cellulose on the pressure of the injected liquid.

Preparing the super-gas-wet nano microcrystalline cellulose prepared in the example 1 into a 0.3% aqueous solution, soaking and aging the core in the aqueous solution for 24 hours, and drying the core, wherein the original control group is to soak the core in clear water for 24 hours and dry the core; placing into core holder and adding water or oil at 2cm³The/min rate was injected for 180 min. The change of the pressure required for injecting water or oil is shown in fig. 6, and the pressure required for injecting water and oil into the core is respectively reduced by 63.85% and 52.54% before and after the super-gas-wet nano microcrystalline cellulose is aged, which indicates that after the super-gas-wet nano microcrystalline cellulose solution is treated, the wall surface of the pore of the core has oleophobic property, the resistance of the oil phase is reduced, the fluidity is enhanced, and the flow capacity of the oil phase and the water phase is improved.

Example 10

Influence of super-air-wet nano microcrystalline cellulose on core permeability.

Preparing the super-gas-wet nano microcrystalline cellulose prepared in the example 1 into 0.3% aqueous solution, soaking three different rock cores with the permeability of 325mD (1#), 610mD (2#) and 1022mD (3#), aging for 24 hours, drying, putting the rock core into a rock core holder, and putting the liquid in a volume of 2cm³The/min rate was injected for 180 min. The recovery rates of different core permeabilities are detected, and the results are shown in fig. 7, and the recovery rates of the three different types of core permeabilities after the aging of the super-gas-wet nano microcrystalline cellulose solution are respectively 44.78%, 34.87% and 21.86%, which indicates that the effect of the super-gas-wet nano microcrystalline cellulose in a low-permeability reservoir is better than that of a high-permeability reservoir, and the super-gas-wet nano microcrystalline cellulose solution is more suitable for the development of unconventional oil and gas fields such as shale layers, condensate gas reservoirs and the like.

Comparative example 1

Super-air-wet nanocrystalline cellulose was prepared according to the method of example 1, except that:

the addition amount of the surfactant N-perfluorooctanoyl-N-aminoethyl propionic acid is 6.6g, and the mass ratio of the nano microcrystalline cellulose to the N-perfluorooctanoyl-N-aminoethyl propionic acid is 1: 6.

The change of the contact angle of water and oil on the surface of the rock core along with the concentration of the nano microcrystalline cellulose solution is detected according to the method of example 4, and the result shows that the contact angle of the water and the oil on the surface of the rock core after the super-air-wet nano microcrystalline cellulose prepared in comparative example 1 is far lower than that of example 1, and super-air-wet transformation can not be achieved, mainly because when the mass ratio of the nano microcrystalline cellulose to the N-perfluorooctanoyl-N-aminoethyl propionic acid is 1:6, the N-perfluorooctanoyl-N-aminoethyl propionic acid is excessive, the molecular structures of the functional groups are intertwined with each other, the functional groups are locked and cannot be normally extended, and then the hydrophobic and oleophobic functions cannot be exerted, thereby reducing the functional activity, therefore, the mass ratio between the nanocrystalline cellulose and the N-perfluorooctanoyl-N-aminoethylpropionic acid should be controlled appropriately.

Comparative example 2

Nanocrystalline cellulose was prepared according to the method of example 1, except that:

the surfactant used was sodium dodecylbenzenesulfonate.

The method of example 4 is used for detecting the change of the contact angle of water and oil on the surface of the rock core along with the concentration of the nano microcrystalline cellulose solution, and the result shows that the product prepared by the method only has hydrophobicity and does not have oleophobic property, so that the simultaneous hydrophobicity and oleophobicity cannot be achieved, namely the transformation from the liquid-wet state to the super-gas-wet state of the surface of the rock core cannot be realized.

Comparative example 3

the mixed solution used was a mixed solution of water and benzyl alcohol.

The method of example 4 is used for detecting the change of the contact angle of water and oil on the surface of the rock core along with the concentration of the nano microcrystalline cellulose solution, and the result shows that the product prepared by the method has poor water and oil repellency compared with the product prepared by example 1, and the benzyl alcohol influences the grafting rate of the surfactant on the surface of the nano microcrystalline cellulose.

Comparative example 4

the catalyst used was thionyl chloride.

The method of example 4 is used for detecting the change of the contact angle of water and oil on the surface of the rock core along with the concentration of the nano microcrystalline cellulose solution, and the result shows that the product prepared by the method has poor water and oil repellency compared with the product prepared by example 1, and the generation of the product is influenced mainly because the functional groups of reactants cannot be activated by thionyl chloride in the reaction process.

Claims

1. The method for preparing the super-air-wet nano microcrystalline cellulose by the one-step method is characterized by comprising the following steps of:

2. The one-step method for preparing super-air-wet nanocrystalline cellulose according to claim 1, wherein the grain size of the nanocrystalline cellulose is 50-100 nm.

3. The one-step method for preparing the super-air-wet nanocrystalline cellulose according to claim 1, wherein ultrasonic dispersion is adopted for the dispersion, and the time of ultrasonic dispersion is 30-40 min.

4. The one-step process for preparing super-air-wet nanocrystalline cellulose according to claim 1, wherein the alcohol solvent is ethanol, glycerol or ethylene glycol;

preferably, the mass ratio of water to the alcohol solvent in the mixed solvent is (8-20): 1.

5. The one-step method for preparing the super-air-wet nano microcrystalline cellulose according to claim 1, wherein the mass ratio of the nano microcrystalline cellulose to the mixed solvent is 1 (30-100).

6. The one-step method for preparing super-air-wet nanocrystalline cellulose according to claim 1, wherein the catalyst is triethylamine, 1, 2-dimethylpropylamine or trioctylamine;

preferably, the mass ratio of the catalyst to the nano microcrystalline cellulose is 1 (10-50).

7. The one-step method for preparing super-air-wet nanocrystalline cellulose according to claim 1, wherein the perfluoroalkanesulfonyl fluoride is perfluorobutylsulfonyl fluoride, perfluorohexylsulfonyl fluoride or perfluorooctylsulfonyl fluoride.

8. The one-step method for preparing the super-air-wet nano microcrystalline cellulose according to claim 1, wherein the mass ratio of the nano microcrystalline cellulose to the surfactant is 1 (2-5);

preferably, the dropping rate of the slow dropping is 1-2 mL/min.

9. The super-air-wet nanocrystalline cellulose prepared according to the method of claim 1.

10. Use of the super gas-wet nanocrystalline cellulose according to claim 9 in gas condensate recovery.