CN113698922B - Biological shearing agent for improving oil extraction efficiency of shale oil reservoir and preparation method and application thereof - Google Patents
Biological shearing agent for improving oil extraction efficiency of shale oil reservoir and preparation method and application thereof Download PDFInfo
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Abstract
The invention provides a biological shearing agent for improving the oil extraction efficiency of a shale oil reservoir, a preparation method and application thereof, wherein plant raw materials are ground and crushed, then mixed with an auxiliary agent, a pH regulator and water, dissolved by adding a cosolvent and dried to obtain biological shearing enzyme powder; and mixing the biological shearing enzyme powder with a stabilizer and a surfactant to obtain the biological shearing agent. The invention is inspired by the marine biofouling principle, natural polyphenol from plant sources and sulfite are added to obtain a product sulfonated on a benzene ring, and an artificially simulated biological shear enzyme is obtained to modify the surface of a rock into an underwater super-oleophobic state so as to separate crude oil, and the viscosity of the product is very low, so that the product has very good permeability even in very small rock gaps, especially can effectively act on various tiny rock gaps to strip the crude oil out, and can be suitable for the high temperature of shale layers.
Description
Technical Field
The invention relates to the technical field of chemistry, in particular to a biological shearing agent for improving the oil extraction efficiency of a shale oil reservoir and a preparation method and application thereof.
Background
Crude oil in shale oil is in a state of being mixed in rock gaps, the gaps among the rocks are extremely small, the formation temperature is high, the crude oil content is low, acting force between the crude oil and the rocks is strong, and the problem of hard bones in the field of oil extraction is always solved.
In conventional oil recovery techniques, it is necessary to emulsify crude oil into water by lowering the oil/water interfacial tension using surfactants or polymeric viscosifiers. However, if the crude oil is strongly adsorbed on the rock surface or the permeability of the rock formation is low, the existing oil recovery technology is difficult to effectively improve the recovery rate.
The crude oil is dispersed into water by using a macromolecule or surfactant solution with low interfacial tension, high viscosity and high emulsification efficiency, so that crude oil is difficult to extract due to the fact that surfactant micelles are usually large in size and enter fine rock gaps to generate great resistance, the recovery efficiency is limited, and particularly, the crude oil is difficult to deal with rock formations with low permeability.
In addition, the activity of the surfactant is obviously reduced under the influence of high temperature, and the surfactant cannot be applied to shale oil layers with higher temperature.
Disclosure of Invention
The invention aims to solve the exploitation problem of shale oil layers, is inspired by the marine biofouling principle, and is characterized in that natural polyphenol from plant sources and auxiliary agent sulfite are added to obtain a product sulfonated on a benzene ring, namely an artificially simulated biological shear enzyme, a pyrocatechol structure and silicon dioxide on the rock surface form a strong hydrogen bond to realize better bonding force, and an R group contains a hydrophilic group, so that the rock surface can be hydrophilized, and simultaneously has an underwater super oleophobic property, the rock surface is modified into an underwater super oleophobic state, so that crude oil is separated, and the viscosity of the product is very low, so that the product has good permeability even in small rock gaps, especially can effectively act on various tiny rock gaps to strip out the crude oil therein, and can effectively play a role at high temperature, so that the product can realize very low injection liquid viscosity, and can effectively play a role even in shale oil layers. Since it does not depend on a low interfacial tension and a high viscosity polymer, it can achieve a very low injection viscosity, and thus can effectively function even in a formation having a very low permeability.
The invention provides a preparation method of a biological shearing agent for improving oil extraction efficiency of a shale oil reservoir, which comprises the following steps:
s1, biological shear enzyme extraction: grinding and crushing plant raw materials to obtain plant powder, mixing the plant powder with an auxiliary agent, a pH regulator and water in a mass ratio of 1:0.1 to 0.25: 0.1-0.5, boiling for 1-24 hours in a closed container, filtering insoluble substances, adding activated carbon into the solution while the solution is hot to adsorb impurities, cooling, filtering, adding cosolvent with the mass fraction of 5-20%, drying the filtrate under reduced pressure, and preparing the filtrate into powder to obtain biological shearing enzyme powder;
the plant raw materials comprise one or more of the following and products or extracts thereof: wild buckwheat rhizome, catechu, persimmon calyx, grape seed, green tea, pomegranate rind and gallnut;
the auxiliary agent is sulfite;
s2, preparing a biological shearing agent: mixing biological shear enzyme powder with a stabilizer and a surfactant according to the mass ratio: 10-50%: 0.1 to 25 percent of the raw materials are mixed to obtain the biological shearing agent;
the surfactant is lower alcohol and its mixture;
the effective temperature of the biological shearing agent is 30-150 ℃.
According to the preparation method of the biological shearing agent for improving the oil extraction efficiency of the shale oil reservoir, as a preferred mode, the plant raw materials in the step S1 further comprise one or more of the following materials and products or extracts thereof: fructus Phyllanthi, lichen, saviae Miltiorrhizae radix, folium fici Microcarpae, radix astragali, calyx Hibisci Sabdariffae, radix Et rhizoma Fagopyri Tatarici, flos Celosiae Cristatae, fructus Chebulae, radix Melastomatis Dodecandri, folium Psidii Guajavae, radix Ephedrae, ramulus Pini Massonianae, radix oryzae Sativae, and folium oryzae Germinatus Phragmitis;
the cosolvent comprises one or more of the following: glucose, sucrose, dextrin and inositol.
According to the preparation method of the biological shearing agent for improving the oil extraction efficiency of the shale oil reservoir, the sulfite comprises one or more of the following components in a preferable mode: sodium sulfite, sodium bisulfite and sodium dithionite.
According to the preparation method of the biological shearing agent for improving the oil production efficiency of the shale oil reservoir, as a preferred mode, in the step S1, the pH regulator comprises one or more of the following components: sodium hydroxide, ammonia water, sodium sulfide, sodium bicarbonate, sodium carbonate, ammonium citrate and ammonium chloride;
co-solvents include one or more of the following: glucose, sucrose, dextrin, starch phosphate, sodium polyacrylate, polyacrylamide, inositol, hydroxymethyl cellulose;
the hydroxymethyl cellulose comprises sodium hydroxymethyl cellulose.
According to the preparation method of the biological shearing agent for improving the oil production efficiency of the shale oil reservoir, as a preferred mode, in the step S2, the stabilizing agent comprises one or more of the following components: choline, nicotinic acid and salts thereof, ascorbic acid, ascorbate, vitamin E, tert-butylhydroquinone, lysine, glutamic acid and salts thereof, arginine, tea polyphenol, anthocyanin, humic acid, sodium thiosulfate, sodium sulfite, sodium hydrosulfite, disodium ethylene diamine tetraacetate, sodium tripolyphosphate, sodium dihydrogen phosphate, disodium hydrogen phosphate and ammonium thiocyanate;
the surfactant in the step S2 is one or more of the following: n-butanol, isopropanol, ethanol, and fusel oil.
According to the preparation method of the biological shearing agent for improving the oil extraction efficiency of the shale oil layer, as a preferred mode, ascorbic acid is isoascorbic acid, ascorbate is sodium isoascorbate, lysine is lysine hydrochloride, arginine is arginine hydrochloride, humic acid is fulvic acid, fulvic acid is potassium fulvate or sodium fulvate, and ethylene diamine tetraacetic acid is EDTA disodium.
According to the preparation method of the biological shearing agent for improving the oil extraction efficiency of the shale oil reservoir, as an optimal mode, the mass fraction of dissolved biological shearing enzyme powder in pure water is more than 5%;
the effective temperature of the biological shearing agent is 30-110 ℃;
dissolving 0.02-1% of biological shearing agent in water, adding 0.01-0.02% of surfactant in water, and injecting into oil well under pressure.
The invention provides a biological shearing agent for improving the oil extraction efficiency of a shale oil reservoir, and the chemical structure of biological shearing enzyme contained in the biological shearing agent is characterized in that: comprises catechol and derivatives thereof, pyrogallol and derivatives thereof, tannic acid and derivatives thereof and natural polyphenol, and also comprises R groups, wherein the R groups are hydrophilic groups, and the R groups are H or metal ions or organic groups except phenolic hydroxyl groups.
The invention relates to a biological shearing agent for improving oil production efficiency of a shale oil reservoir, which is characterized in that as a preferred mode, the structural formula of biological shearing enzyme is as follows:
the R groups include any one or more of: carboxyl, ester group, amino, sulfonic group, sodium sulfonate group;
the number of R groups is 1 or 2.
The biological shearing agent for improving the oil extraction efficiency of the shale oil reservoir is used as a preferable mode, the biological shearing agent is used for crude oil extraction, and a rock stratum where crude oil is located is permeable to water.
The existing oil recovery technology mainly utilizes a macromolecule or surfactant solution with low interfacial tension, high viscosity and high emulsification efficiency to disperse crude oil into water, but has limited capability of improving recovery efficiency, and is particularly difficult to deal with rock formations with low permeability. The biological shearing agent simulates the underwater adhesion principle of mussels, and the biological extract is utilized to treat the rock surface into an underwater super-oleophobic state in situ, so that the rock surface is not separated from the crude oil by adhering. Moreover, the biological shearing agent can form a protective layer on the rock surface to prevent the detached crude oil from being continuously adsorbed on the rock surface. The whole solution has low viscosity, so that the recovery rate of the crude oil in the low-permeability stratum can be effectively improved.
Marine organisms such as mussels and sea squirts can utilize the adhesive proteins secreted by the marine organisms to firmly adsorb various underwater rock surfaces to form marine fouling, but the marine fouling organisms such as the mussels are difficult to adhere to the marine fouling organisms again. This is because marine organisms such as mussel can form the super hydrophilic layer of one deck on its surface when forming stained, has super oleophobic effect under water simultaneously, can effectively resist subsequent marine stain. Inspired by the process, the method used by the invention simulates the fouling principle of marine organisms such as mussels and the like, and utilizes marine fouling substances (biological shear enzymes) secreted by the organisms to be adsorbed on the surface of the rock to promote the crude oil on the surface of the rock to be separated.
In conventional oil recovery techniques, it is necessary to emulsify crude oil into water by lowering the oil/water interfacial tension using a surfactant or a polymeric viscosifier. However, if the crude oil is strongly adsorbed on the rock surface or the permeability of the rock formation is low, the existing oil recovery technology is difficult to effectively improve the recovery rate. The method simulates the marine biofouling principle, uses biological shear enzymes to directly modify the rock surface into underwater super-oleophobic property, and can separate crude oil without depending on low interfacial tension or high viscosity, thereby greatly improving the crude oil recovery ratio.
Crude oil in shale oil is in a state of being mixed in rock gaps, the gaps among the rocks are extremely small, the formation temperature is high, the crude oil content is low, acting force between the crude oil and the rocks is strong, and the problem of hard bones in the field of oil extraction is always solved. The technology is inspired by the marine biofouling principle, and utilizes artificially simulated biological shear enzymes to change the rock surface into underwater super oleophobic and separate crude oil. This approach does not rely on low interfacial tension and high viscosity and can function effectively at high temperatures, and therefore very low injection fluid viscosities can be achieved, and therefore can function effectively even in shale oil formations. Since it does not depend on a low interfacial tension and a high viscosity polymer, it can realize a very low injection viscosity, and thus can effectively function even in a formation having a very low permeability.
The formation principle of the super-hydrophilic/underwater super-hydrophobic oil layer is as follows:
strong hydrogen bonds are formed between catechol structures in the biological shear enzymes and silicon dioxide on the rock surface, so that better binding force is realized, and meanwhile, R groups contain hydrophilic groups, so that the rock surface can be subjected to hydrophilization, and the underwater super-oleophobic property is achieved;
the extraction principle of the biological shear enzyme is as follows:
the effective component of the adhesive protein in the mussel is mainly L-dopa or dopamine, and the mussel is expensive both in natural extraction and artificial synthesis. Many plants contain abundant polyphenols, and are low in cost and convenient to extract. During the heating and boiling process, the natural polyphenol of plant origin and sulfite are added to obtain a sulfonated product on a benzene ring. The natural polyphenol can improve the hydrophilicity and the solubility after being sulfonated.
The cosolvent has the function of preventing the extracted biological shearing enzyme from caking in the drying process, and is favorable for quick dissolution;
the stabilizer has the function of providing reducibility and preventing polyphenol from being oxidized in the using process. Since the effect of surface modification is remarkably deteriorated after polyphenol is oxidized, it is necessary to add a substance having reducing property.
Surfactants are used to reduce surface tension, reduce viscosity, increase permeability, and require the use of surfactants suitable for high temperatures.
The chemical structure characteristics of the biological shear enzyme are as follows: contains natural biological extract (natural polyphenol) with catechol structure and similar matter synthesized artificially, and also includes catechol itself, pyrogallol or various derivatives with adjacent diphenol structure, and natural polyphenol with undefined structure. Among these, polyphenolic compounds generally have the following structural features:
it is characterized in that the molecular structure contains benzene ring or polyacene ring structure (a plurality of benzene rings can be simultaneously contained, such as tannic acid), and two hydroxyl groups exist at two adjacent positions of the benzene ring.
The R group may be H or a metal ion or other organic group.
Not only simple catechol and pyrogallol but also catechol/pyrogallol/diphenol with other aromatic ring structures having substituents attached to the benzene ring structure thereof. The structure is not limited to the polyphenols drawn in the above figures, and the number of the substituents is not limited to 2 (excluding phenolic hydroxyl groups), and may be any other position except phenolic hydroxyl groups.
Some structures are not completely defined, but compounds known to contain a large number of polyphenolic structures are also included (such as humic acids, fulvic acids, peat, plant tannins, mixed anthocyanins, etc.).
Laboratory tests show that: 1% biological shear enzyme solution, soaking glass/quartz/silicate ceramic/silicate rock, placing at room temperature for 1 hour, taking out, uniformly wetting the surface with a layer of uniform water film, and realizing an underwater oil contact angle of more than 150 ° (liquid crude oil or n-hexadecane).
The use temperature of the biological shearing agent is 30-150 ℃.
The alkaline aqueous solution of the biological shearing agent is easy to oxidize in the air, and the color is deepened after the oxidation, and the effect is poor.
The invention has the following advantages:
(1) The invention is inspired by the marine biofouling principle, natural polyphenol from plant sources and auxiliary sulfite are added to obtain a product sulfonated on a benzene ring, namely an artificially simulated biological shear enzyme, a strong hydrogen bond is formed between a catechol structure and silicon dioxide on the surface of rock, better binding force is realized, and an R group contains a hydrophilic group, so that the surface of the rock can be hydrophilized, and simultaneously has underwater super oleophobic property, so that the surface of the rock is changed into underwater super oleophobic and crude oil is separated. This approach does not rely on low interfacial tension and high viscosity, and therefore can achieve very low injection fluid viscosity, and therefore can function effectively even in formations with very low permeability. Meanwhile, the technology can be used in combination with the traditional oil extraction technology, and a better effect can be obtained.
(2) The invention is characterized in that the invention directly acts on the rock to modify the rock surface into an underwater super-oleophobic state so as to separate crude oil, and the viscosity of the rock surface is very low, so that the rock surface has very good permeability even in very small rock gaps, and particularly can effectively act on various tiny rock gaps to strip out the crude oil therein, and can effectively act under the conditions of high temperature and high salt.
(3) The invention relies on the chemical reaction of key component biological shear enzyme on the rock surface, has the applicable temperature range of room temperature to 150 degrees, and is particularly suitable for shale oil reservoirs.
Drawings
FIG. 1 is a flow chart of a biological shearing agent for improving oil production efficiency of shale oil reservoir and a preparation method thereof.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Example 1
As shown in fig. 1, a preparation method of a biological shearing agent for improving oil production efficiency of a shale oil reservoir comprises the following steps:
s1, biological shear enzyme extraction: grinding and crushing plant raw materials to obtain plant powder, mixing the plant powder with an auxiliary agent, a pH regulator and water in a mass ratio of 1:0.1 to 0.25: 0.1-0.5, 15-30, boiling in a closed container for 1-24 hours, filtering out insoluble substances, adsorbing impurities, adding a cosolvent with the mass fraction of 5-20%, dissolving, and drying to obtain biological shear enzyme powder;
the plant raw materials comprise one or more of the following and products or extracts thereof: wild buckwheat rhizome, catechu, calyx kaki, grape seed, green tea, pomegranate rind and gallnut;
the auxiliary agent is sulfite;
s2, preparing a biological shearing agent: mixing biological shear enzyme powder with a stabilizer and a surfactant according to the mass ratio: 10-50%: 10-50%: 0.1 to 25 percent of the mixture is mixed to obtain the biological shearing agent;
the surfactant is lower alcohol and its mixture;
the effective temperature of the biological shearing agent is 30-150 ℃.
Example 2
As shown in fig. 1, a method for preparing a biological shearing agent for improving oil extraction efficiency of a shale oil reservoir comprises the following steps:
s1, biological shear enzyme extraction: grinding and crushing plant raw materials to obtain plant powder, mixing the plant powder with an auxiliary agent, a pH regulator and water in a mass ratio of 1:0.1 to 0.25: 0.1-0.5, boiling for 1-24 hours in a closed container, filtering insoluble substances, adding activated carbon into the solution while the solution is hot to adsorb impurities, cooling, filtering, adding cosolvent with the mass fraction of 5-20%, drying the filtrate under reduced pressure, and preparing the filtrate into powder to obtain biological shearing enzyme powder;
the plant material comprises one or more of the following and products or extracts thereof: wild buckwheat rhizome, catechu, persimmon calyx, grape seed, green tea, pomegranate rind, gallnut, emblic leafflower fruit, lichen, red sage root, banyan leaf, astragalus root, solanum decaseptemlobus, tartary buckwheat, cockscomb flower, myrobalan, rhodomyrtus tomentosa root, guava leaf, ephedra root, pine branch, rice root and rice leaf;
the auxiliary agent is sulfite;
sulfites include one or more of the following: sodium sulfite, sodium bisulfite, sodium dithionite;
the pH regulator comprises one or more of the following components: sodium hydroxide, ammonia water, sodium sulfide, sodium bicarbonate, sodium carbonate, ammonium citrate and ammonium chloride;
the cosolvent comprises one or more of the following: glucose, sucrose, dextrin, inositol;
s2, preparing a biological shearing agent: mixing the biological shearing enzyme powder with a stabilizer and a surfactant to obtain a biological shearing agent;
the stabilizer comprises one or more of the following: choline, nicotinic acid and salts thereof, ascorbic acid, ascorbate, vitamin E, tert-butylhydroquinone, lysine, glutamic acid and salts thereof, arginine, tea polyphenol, anthocyanin, humic acid, sodium thiosulfate, sodium sulfite, sodium hydrosulfite, ethylene diamine tetraacetic acid disodium, sodium tripolyphosphate, sodium dihydrogen phosphate, disodium hydrogen phosphate and ammonium thiocyanate;
ascorbic acid is isoascorbic acid, ascorbate is sodium isoascorbate, lysine is lysine hydrochloride, arginine is arginine hydrochloride, humic acid is fulvic acid, fulvic acid is potassium fulvate or sodium fulvate, and ethylene diamine tetraacetic acid is EDTA disodium;
the surfactant is lower alcohols and a mixture thereof, and the surfactant is one or more of the following: n-butanol, isopropanol, ethanol, and fusel oil.
The mass fraction of the biological shear enzyme dissolved in pure water is more than 5 percent; (ii) a
The effective temperature of the biological shearing agent is 30-150 ℃;
the application method of the biological shearing agent comprises the following steps: dissolving the biological shearing agent in water in 0.02-1 wt%, adding surfactant in 0.01-0.02 wt% and pressurizing to inject into oil well.
Example 3:
[1] the formation condition is as follows: the formation temperature is 95 ℃, and the porosity of rock type siltstone (quartz sand) is 2 percent;
[2] plant raw materials: fagopyrum cymosum powder + catechu powder (2;
[3] the processing method comprises the following steps:
crushing plant raw materials, and adding a pH regulator, sodium sulfide (with the addition of 10%), ammonium chloride (with the addition of 5%), sodium sulfite (with the addition of 12%) and 2000% of water;
decocting at 110 deg.C under pressure for 20 hr, filtering to remove insoluble substances, adding active carbon, boiling for 1 hr, and filtering to obtain solution;
adding cosolvent glucose with the addition amount of 15% into the solution;
drying the solution under reduced pressure to obtain dry powder, and mixing with sodium hydrosulfite and EDTA disodium (5% and 12%) to obtain biological shearing agent;
[4] the using method comprises the following steps:
dissolving the biological shearing agent in tap water according to the mass ratio of 0.2%, adding 0.01% of butanol, and injecting the mixture into an oil well under pressure;
[5] the use effect is as follows:
compared with stratum water flooding, the use of the biological shear enzyme can improve the crude oil recovery rate by 14%.
Example 4:
[1] the formation condition is as follows: the stratum temperature is 120 ℃, the rock type quartz has the porosity of 1.5-2%;
[2] plant raw materials: persimmon calyx powder + grape seed powder + green tea powder (1;
[3] the processing method comprises the following steps:
crushing plant raw materials, adding a pH regulator, sodium hydroxide (the addition amount of 10%), ammonium citrate (the addition amount of 7%), ammonium chloride (the addition amount of 3%), sodium sulfite (25%) and 2200% of water;
decocting at 110 deg.C under pressure for 22 hr, filtering to remove insoluble substances, adding active carbon, boiling for 1 hr, and filtering to obtain solution;
adding cosolvent glucose with the addition amount of 15% into the solution;
drying the solution under reduced pressure to prepare dry powder, and mixing the dry powder with ammonium thiocyanate (15%), tea polyphenol (5%), sodium hydrosulfite (3%) and EDTA disodium (12%) to obtain a biological shearing agent;
[4] the using method comprises the following steps:
dissolving the biological shearing agent in tap water according to the mass ratio of 0.2%, adding 0.01% of isopropanol at the same time, and injecting the mixture into an oil well under pressure;
[5] the use effect is as follows:
compared with stratum water flooding, the use of the biological shear enzyme can improve the crude oil recovery by 17%.
Example 5:
[1] the formation condition is as follows: the stratum temperature is 136 ℃, the rock types are quartz and feldspar, and the porosity is 1-2%;
[2] plant raw materials: persimmon calyx powder + grape seed powder + green tea powder (1;
[3] the processing method comprises the following steps:
crushing plant raw materials, and adding a pH regulator, ammonia water (addition amount of 13%), ammonium citrate (addition amount of 7%), ammonium chloride (addition amount of 5%), sodium sulfite (18%) and 2100% of water;
decocting at 105 deg.C under pressure for 22 hr, filtering to remove insoluble substances, adding active carbon, boiling for 1 hr, and filtering to obtain solution;
adding cosolvent glucose with the addition amount of 15% into the solution;
drying the solution under reduced pressure to prepare dry powder, and mixing the dry powder with sodium fulvate (8%), sodium erythorbate (6%), sodium thiosulfate (3%) and EDTA disodium (10%) to obtain a biological shearing agent;
[4] the using method comprises the following steps:
dissolving the biological shearing agent in tap water according to the mass ratio of 0.2%, adding 0.02% fusel oil at the same time, and injecting the mixture into an oil well under pressure;
[5] the use effect is as follows:
compared with stratum water flooding, the use of the biological shear enzyme can improve the crude oil recovery rate by 16%.
Example 6
A biological shearing agent for improving the oil extraction efficiency of a shale oil reservoir, wherein the chemical structure of a biological shearing enzyme contained in the biological shearing agent is characterized in that: the compound comprises catechol and derivatives thereof, pyrogallol and derivatives thereof, tannic acid and derivatives thereof, natural polyphenol and R groups, wherein the R groups are hydrophilic groups, and the R groups are H or metal ions or organic groups except phenolic hydroxyl groups.
Example 7
A biological shearing agent for improving the oil extraction efficiency of a shale oil reservoir, wherein the chemical structure of a biological shearing enzyme contained in the biological shearing agent is characterized in that: the compound comprises catechol and derivatives thereof, pyrogallol and derivatives thereof, tannic acid and derivatives thereof, natural polyphenol and R groups, wherein the R groups are hydrophilic groups, are H or metal ions or organic groups except phenolic hydroxyl groups, and have the following structural formula:
the R groups include any one or more of: carboxyl, ester group, amino, sulfonic acid (sodium) group;
the number of R groups is 1 or 2;
the biological shearing agent for improving the oil extraction efficiency of the shale oil reservoir is applied to crude oil extraction, and the rock stratum where the crude oil is located is permeable to water.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered as the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.
Claims (10)
1. A preparation method of a biological shearing agent for improving oil production efficiency of a shale oil reservoir is characterized by comprising the following steps: the method comprises the following steps:
s1, biological shear enzyme extraction: grinding and crushing plant raw materials to obtain plant powder, and mixing the plant powder, an auxiliary agent, a pH regulator and water in a mass ratio of 1:0.1 to 0.25: 0.1-0.5, boiling for 1-24 hours in a closed container, filtering insoluble substances, adding activated carbon into the solution while the solution is hot to adsorb impurities, cooling, filtering, adding cosolvent with the mass fraction of 5-20%, drying the filtrate under reduced pressure, and preparing the filtrate into powder to obtain biological shearing enzyme powder;
the plant raw materials comprise one or more of the following and products or extracts thereof: wild buckwheat rhizome, catechu, persimmon calyx, grape seed, green tea, pomegranate rind and gallnut;
the auxiliary agent is sulfite;
s2, preparing a biological shearing agent: the biological shear enzyme powder, a stabilizer and a surfactant are mixed according to the mass ratio of: 10-50%: 10-50%: 0.1 to 25 percent of the mixture is mixed to obtain the biological shearing agent;
the surfactant is lower alcohols and a mixture thereof;
the effective temperature of the biological shearing agent is 30-150 ℃;
the chemical structure characteristics of the biological shearing enzyme contained in the biological shearing agent are as follows: including catechol, pyrogallol and derivatives thereof;
the biological shearing agent modifies the rock surface into an underwater super-oleophobic state so as to separate the crude oil.
2. The method for preparing the biological shearing agent for improving the oil extraction efficiency of the shale oil reservoir as claimed in claim 1, is characterized in that: the plant raw materials in the step S1 also comprise one or more of the following products or extracts thereof: fructus Phyllanthi, lichen, saviae Miltiorrhizae radix, folium fici Microcarpae, radix astragali, calyx Hibisci Sabdariffae, radix Et rhizoma Fagopyri Tatarici, flos Celosiae Cristatae, fructus Chebulae, radix Melastomatis Dodecandri, folium Psidii Guajavae, radix Ephedrae, ramulus Pini Massonianae, radix oryzae Sativae, and folium oryzae Germinatus Phragmitis;
the co-solvent comprises one or more of the following: glucose, sucrose, dextrin, inositol;
the biological shearing agent permeates into rock gaps to strip crude oil.
3. The method for preparing the biological shearing agent for improving the oil extraction efficiency of the shale oil reservoir as claimed in claim 1, is characterized in that: the sulfite comprises one or more of: sodium sulfite, sodium bisulfite and sodium hydrosulfite.
4. The method for preparing the biological shearing agent for improving the oil production efficiency of the shale oil reservoir as claimed in claim 1, is characterized in that:
in step S1, the pH adjuster includes one or more of: sodium hydroxide, ammonia water, sodium sulfide, sodium bicarbonate, sodium carbonate, ammonium citrate and ammonium chloride.
5. The method for preparing the biological shearing agent for improving the oil extraction efficiency of the shale oil reservoir as claimed in claim 1, is characterized in that:
in step S2, the stabilizer comprises one or more of: choline, nicotinic acid and salts thereof, ascorbic acid, ascorbate, vitamin E, tert-butylhydroquinone, lysine, glutamic acid and salts thereof, arginine, tea polyphenol, anthocyanin, humic acid, sodium thiosulfate, sodium sulfite, sodium hydrosulfite, ethylene diamine tetraacetic acid disodium, sodium tripolyphosphate, sodium dihydrogen phosphate, disodium hydrogen phosphate and ammonium thiocyanate;
the surfactant in the step S2 is one or more of the following: n-butanol, isopropanol, ethanol, and fusel oil.
6. The method for preparing the biological shearing agent for improving the oil extraction efficiency of the shale oil reservoir as claimed in claim 5, is characterized in that: the ascorbic acid is isoascorbic acid, the ascorbate is sodium erythorbate, the lysine is lysine hydrochloride, the arginine is arginine hydrochloride, the humic acid is fulvic acid, the fulvic acid is potassium fulvate or sodium fulvate, and the disodium ethylene diamine tetraacetate is disodium EDTA.
7. The method for preparing the biological shearing agent for improving the oil extraction efficiency of the shale oil reservoir as claimed in claim 1, is characterized in that:
the mass fraction of the biological shear enzyme powder dissolved in pure water is more than 5%;
dissolving the biological shearing agent in water according to the mass fraction of 0.02-1%, adding a surfactant with the mass fraction of 0.01-0.02% of water, and injecting the mixture into an oil well under pressure.
8. The method for preparing the biological shearing agent for improving the oil extraction efficiency of the shale oil reservoir as claimed in claim 1, is characterized in that: the biological shear enzyme also comprises natural polyphenol and an R group, wherein the R group is a hydrophilic group, and the R group is H or metal ions or organic groups except phenolic hydroxyl.
9. The method for preparing the bio-shearing agent for improving the oil production efficiency of the shale oil reservoir as claimed in claim 8, characterized in that: the structural formula of the biological shear enzyme is as follows:
the R groups include any one or more of: carboxyl, ester group, amino, sulfonic group, sodium sulfonate group;
the number of R groups is 1 or 2.
10. The application of the biological shearing agent obtained by the preparation method of the biological shearing agent for improving the oil production efficiency of the shale oil reservoir according to any one of claims 1 to 9 is characterized in that: the biological shearing agent is applied as crude oil exploitation, and a rock stratum where the crude oil is located is permeable to water.
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