Shale oil reservoir biological nano-imbibition oil displacement agent and preparation method thereof

Abstract

The application discloses a shale oil reservoir biological nano infiltration oil displacement agent and a preparation method thereof, relates to the field of shale oil and super-low-permeability reservoir oil well yield increase, and solves the problems of tight shale oil reservoir, difficulty in oil-water replacement of fracturing flowback fluid, and low recovery efficiency, and comprises the following components: nano active zinc oxide, rhamnolipid, a biological penetration agent, isooctanol polyoxyethylene ether phosphate, and industrial deionized water; the infiltration oil displacement agent enters the inside of tight pore throats of shale oil through the penetration function, washes crude oil on the surface of rocks in the flowing process, coagulates crude oil in the well soaking process, and uses the oil displacement function to separate crude oil from the pore throats in the flowback and oil production process; the crude oil in the shale oil matrix is driven out through oil-water replacement, the purpose of improving the single-well yield of shale oil and improving the recovery efficiency is achieved, and efficient development of the shale oil reservoir is realized. Meanwhile, the infiltration oil displacement agent does not affect the late emulsification separation and demulsification performance of crude oil after biodegradation, and the late operation cost of shale oil is reduced.

Description

Technical Field

[0001] This invention relates to the field of shale oil and ultra-low permeability reservoir well production enhancement technology, and more specifically to the field of shale oil reservoir percolation displacement technology. Background Technology

[0002] As a typical low-permeability oil and gas field, Changqing Oilfield transforms from a single-pore media system into a dual reservoir-permeability system after fracturing, resulting in significant changes to the oil displacement mechanism. In the fractured system, the main driving forces for oil displacement are differential pressure and gravity; in the matrix system, the main driving force is capillary force. The rocks in Changqing Oilfield are primarily hydrophilic, making capillary force even more pronounced in driving crude oil. Under the influence of capillary force, water is absorbed from the fractures into the oil-bearing matrix, while the crude oil in the matrix is ​​displaced through oil-water exchange. This process is known as shale oil reservoir adsorption-displacement.

[0003] Shale oil tight reservoirs are often developed using horizontal well fracturing. During fracturing, it has been found that only 10%–50% of the fracturing fluid is flowed back, resulting in a low flowback rate and causing some damage to the reservoir. If the unflowed fracturing fluid could be utilized for oil displacement through percolation, increasing post-fracturing production, a dual benefit could be achieved. Therefore, the percolation and displacement of oil from the remaining fracturing fluid is crucial in shale oil development. Thus, there is a need to develop a bio-nano percolation and displacement agent for shale oil reservoirs. This agent, without affecting the basic properties of the shale oil fracturing fluid, would displace crude oil from the shale oil matrix through oil-water displacement, thereby increasing single-well production and recovery rate, and providing guidance for the efficient development of shale oil tight reservoirs.

[0004] Chinese Patent No. CN113527147B discloses a method for preparing a wetting-resistant percolation oil displacement agent, belonging to the field of oilfield tertiary oil recovery technology. The method involves a two-step process: chlorination and addition sulfonation of the hydroxyl groups on acetylenol polyoxyethylene ether. By modifying the hydroxyl groups on the acetylenol polyoxyethylene ether, an anionic-nonionic structure is obtained as the oil displacement agent. This anionic-nonionic structure provides lower interfacial tension and good salt resistance. The branched acetylenol structure utilizes its efficient adsorption on solid surfaces to achieve wetting reversal of the oil-wetting pore throat, realizing capillary self-percolation oil displacement. The wetting-resistant percolation oil displacement agent of this invention has a novel structure and simple components, avoiding the poor oil displacement effect caused by chromatographic separation effects in conventional compound oil displacement agents. In formation water at 60℃, the interfacial tension with crude oil is ≤10. -2 With a flow rate on the order of mN / m and a contact angle of ≤60° with the water phase in aged core sections, it effectively improves oil recovery.

[0005] Chinese Patent No. CN114410286A, published on April 29, 2022, discloses a temperature- and salt-resistant nano-permeable displacement agent, its preparation method, and its application. The agent comprises the following components: 20-40 parts by weight of active nanomaterials; 10-30 parts by weight of nonionic surfactants; and 10-30 parts by weight of anionic surfactants. The active nanomaterials are obtained by polymerizing raw materials containing double-bond modified sheet-like nanomaterials, hydrophilic monomers, and hydrophobic monomers. The hydrophilic monomers are selected from at least one of acid anhydride compounds; and the hydrophobic monomers are selected from at least one of long-chain alkyl allyl quaternary ammonium salts. The addition of active nanomaterials to the temperature- and salt-resistant nano-permeable displacement agent, combined with anionic and nonionic surfactants, allows for synergistic effects, resulting in an easily prepared, highly efficient temperature- and salt-resistant nano-permeable displacement agent (system) suitable for low-permeability reservoirs. This has significant importance and economic value in improving the development efficiency of low-permeability reservoirs.

[0006] The aforementioned patents represent percolation flooding agents primarily composed of acetylsene glycol polyoxyethylene ether surfactants. Targeting low-permeability reservoirs, these surfactants adsorb onto the rock surface, altering rock wettability and reversing the wetting of oil-wetted pore throats. Current research on denser shale oil reservoirs is limited. Shale oil reservoir pore throat diameters range from 200nm to 500nm; excessively large nanoparticle sizes and the accumulation of multiple nanoparticles can cause secondary blockage of the reservoir, reducing development efficiency. The Changqing shale oil reservoir primarily exhibits hydrophilic wettability; simply altering wettability cannot effectively address shale oil percolation. The introduction of conventional surfactants can affect the mid-to-late-stage emulsification and separation of produced fluids, reducing crude oil demulsification efficiency and making crude oil demulsification and dehydration difficult. To improve the overall recovery rate of shale oil reservoirs and achieve efficient development of unconventional shale oil resources, it is necessary to develop a bio-nano percolation flooding agent for shale oil reservoirs. This agent should increase single-well production and improve recovery rate without affecting the basic performance of shale oil fracturing fluids. Summary of the Invention

[0007] The purpose of this invention is to solve the technical problems of tight shale oil reservoirs, difficulty in oil-water replacement of fracturing flowback fluid, and low overall recovery rate. This invention provides a shale oil reservoir bio-nano-infiltration displacement agent and its preparation method.

[0008] To achieve the above objectives, the present invention specifically adopts the following technical solution: a shale oil reservoir bio-nano-permeable displacement agent, which, by weight percentage, comprises: 5-8% nano-active zinc oxide, 30-40% rhamnose lipolipid, 10-20% bio-permeable agent, 5-10% isooctanol polyoxyethylene ether phosphate, and the balance being industrial deionized water.

[0009] In the technical solution of this application: nano-active zinc oxide is used as the nano-active material, rhamnolipid as the bioactive agent, C12-C14 alkyl glycosides and alcohol ether glycosides as bio-penetrating agents, and isooctanol polyoxyethylene ether phosphate as a bio-auxiliary agent. Because nano-active zinc oxide self-assembles on the surface of rhamnolipid, and then forms a bio-nano-penetrating oil displacement agent through block alkyl glycosides and alcohol ether glycosides, the nano-active zinc oxide has an extremely small nanoparticle size. The nanomaterial can play a better microscale effect in the finer pores and throats of shale oil reservoirs. The bio-nano-derived oil displacement agent is transported to and through pore throats. Alkyl glycosides and alcohol ether glycosides have excellent permeability, promoting the penetration of rhamnolipin and isooctanol polyoxyethylene ether phosphate into every corner of the remaining oil-rich area, changing the wettability of the rock. The single-layer laying of nanomaterials increases the water absorption of pores, shortens the permeation and diffusion stage, effectively improves the permeation capacity, and promotes the replacement of more crude oil. Rhamnolipin can activate the original microorganisms in the formation, playing a synergistic role in oil recovery, so that more crude oil can be extracted during the flowback of fracturing fluid.

[0010] The mechanism by which the bio-nano-based oil displacement agent for shale oil reservoirs exhibits high oil displacement capacity at low concentrations is as follows: The bio-nano-based oil displacement agent's molecular structure consists of nanomaterials assembled on the surface of rhamnolipids, with glycoside surfactants distributed on the outer side of the molecular structure. During oil displacement, the aqueous solution of the bio-nano-based oil displacement agent forms a "wedge-shaped film" in the three-phase contact region between the oil / water / rock surface. The nanoparticles in the aqueous phase are orderly arranged and distributed within the "wedge-shaped film," forming a solid-like structural morphology. Due to electrostatic repulsion, Brownian motion, and van der Waals forces, the bio-nano-based oil displacement agent nanoparticles exert an inward pressure on the "wedge-shaped film," causing the oil-water interface to move towards the center of the oil droplets, "scooping" the adsorbed oil droplets off the rock surface, and enhancing the diffusion behavior of the fluid. The smaller the nanoparticle size (5-10 nm), the more ordered the structure formed in the "wedge-shaped film," the closer it is to a solid state, and the greater the electrostatic repulsion between particles, thus generating a greater structural separation pressure. Furthermore, as particle concentration increases, the number of nanomaterials distributed in the three-phase "wedge-shaped film" increases, and the structure becomes more solid-like. This increases the pressure exerted on the "wedge-shaped film" to promote the separation of crude oil from the rock surface. The alkyl glycosides, alcohol ether glycosides, and isooctanol polyoxyethylene ether phosphate biosurfactants in the bio-nano-permeable displacement agent can reduce the oil-water interfacial tension, promote the dispersion of crude oil in the aqueous phase, and reduce the difficulty for nanomaterials to "scrape" the adsorbed crude oil off the rock surface, thus demonstrating its high oil displacement efficiency at low concentrations.

[0011] Furthermore, by weight percentage, the permeation displacement agent comprises: 6.5% nano-active zinc oxide, 35% rhamnolipid, 15% bio-penetrating agent, 7.5% isooctanol polyoxyethylene ether phosphate, and 36% industrial deionized water.

[0012] Furthermore, the bio-penetrating agent includes C12-C14 alkyl glycosides and alcohol ether glycosides, with C12-C14 alkyl glycosides accounting for 5-10% and alcohol ether glycosides accounting for 5-10% by weight.

[0013] Furthermore, the particle size of the nano-active zinc oxide is 5-10 nm.

[0014] A method for preparing a bio-nano-based permeation displacement agent for shale oil reservoirs includes the following steps:

[0015] Step 1: Add industrial deionized water to the ultrasonic cleaner according to the above weight percentage, turn on the electric stirrer, slowly add nano-active zinc oxide to the ultrasonic cleaner, and then stir for 20-30 minutes.

[0016] Step 2: After stirring, add rhamnolipin to the ultrasonic cleaner, turn on the ultrasonic cleaner, set the first ultrasonic power, and the electric stirrer speed to 200-250 rpm / min, and ultrasonically synthesize for 4-6 hours; adjust to the second ultrasonic power, and the electric stirrer speed to 300-400 rpm / min, add C12-C14 alkyl glycosides and alcohol ether glycosides, and ultrasonically synthesize for 2-3 hours; adjust to the third ultrasonic power, and the electric stirrer speed to 200-250 rpm / min, add isooctanol polyoxyethylene ether phosphate, and ultrasonically synthesize for 1-2 hours; turn off the ultrasonic cleaner (stop ultrasonication and stirring), let stand, and obtain the shale oil reservoir bio-nano-adsorption displacement agent;

[0017] Furthermore, in step 1, the stirring speed of the electric mixer is 400-500 rpm / min.

[0018] Furthermore, nano-active zinc oxide is added to the ultrasonic cleaner at a rate of 1-5 kg / min.

[0019] Furthermore, in step 2, the first ultrasonic power is 1500-2000W, the second ultrasonic power is 1000-1300W, and the third ultrasonic power is 500-800W.

[0020] Furthermore, the first ultrasonic power was set to 1750W, the electric mixer speed was set to 225rpm / min, and the ultrasonic synthesis was carried out for 5 hours; the second ultrasonic power was adjusted to 1200W, the electric mixer speed was set to 350rpm / min, C12-C14 alkyl glycosides and alcohol ether glycosides were added, and the ultrasonic synthesis was carried out for 2.5 hours; the third ultrasonic power was adjusted to 650W, the electric mixer speed was set to 230rpm / min, isooctyl alcohol polyoxyethylene ether phosphate was added, and the ultrasonic synthesis was carried out for 1.5 hours.

[0021] Furthermore, the settling time is 0.5-1 hour.

[0022] The beneficial effects of this invention are as follows:

[0023] 1. The bio-nano-permeable oil displacement agent of this invention penetrates into the dense pores and throats of shale oil through its permeation function. During the flow process, it washes the crude oil from the rock surface; during the well shut-in process, it condenses the crude oil; and during the flowback and oil production processes, it displaces the crude oil from the pores and throats through its oil displacement function. The bio-nano-permeable oil displacement agent displaces the crude oil in the shale oil matrix through oil-water replacement, thereby increasing the production of shale oil per well and improving the recovery rate, achieving efficient development of shale oil reservoirs. Simultaneously, the bio-nano-permeable oil displacement agent does not affect the later emulsification and demulsification performance of the crude oil after biodegradation, reducing the later-stage operating costs of shale oil production.

[0024] 2. The shale oil reservoir bio-nano-permeation displacement agent of the present invention has the characteristics of low concentration and high oil displacement capacity;

[0025] 3. The shale oil reservoir bio-nano-adsorption displacement agent of the present invention has good single-layer adsorption and laying ability and strong erosion resistance.

[0026] 4. The shale oil reservoir bio-nano-permeable displacement agent of the present invention has a large self-permeable water absorption capacity and a short self-permeable water absorption saturation time, which is beneficial to the permeable displacement of shale oil reservoirs.

[0027] 5. The shale oil reservoir bio-nano-absorption displacement agent of this invention has high biodegradability. Rhamnose glycosides, alkyl glycosides, and alcohol ether glycosides are all biodegradable surfactants that produce significant solubilization effects in crude oil, making it easily absorbed and degraded by Pseudomonas and other bacteria, without affecting shale oil crude oil emulsification, produced fluid stratification, or subsequent demulsification and dehydration. Conventional displacement agents, after completing their displacement action, are distributed in the crude oil, and incompatibility with subsequently added demulsifiers or surfactant molecule entanglement makes crude oil demulsification difficult, increasing the difficulty of oil production and dehydration, and increasing subsequent cost inputs. Attached Figure Description

[0028] Figure 1 This is a graph showing the self-permeation test results of the shale oil reservoir bio-nano-permeation displacement agent prepared in Example 3 of this invention;

[0029] Figure 2 This is a graph showing the evaluation results of the oil displacement performance of the bio-nano-permeable oil displacement agent prepared in Example 3 of this invention in natural shale oil cores;

[0030] Figure 3 This is a graph showing the adsorption performance test results of the shale oil reservoir bio-nano-infiltration displacement agent prepared in Example 3 of the present invention on the core surface. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments.

[0032] Therefore, all other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0033] Example 1

[0034] This embodiment provides a shale oil reservoir bio-nano-based percolation displacement agent. Under normal temperature conditions, 40% industrial deionized water is added to an ultrasonic cleaner, and the electric stirrer is turned on with a speed of 500 rpm / min. 5% nano-active zinc oxide is slowly added to the ultrasonic cleaner at a rate of 1 kg / min, and stirred for 30 minutes after addition. 40% rhamnolipid is added, the ultrasonic cleaner is turned on, the ultrasonic power is set to 2000 W, the electric stirrer speed is set to 200 rpm / min, and the ultrasonic synthesis time is 4 hours. The ultrasonic power is adjusted to 1300 W, the electric stirrer speed is set to 300 rpm / min, and 5% C12-C14 alkyl glycosides and 5% alcohol ether glycosides are added, with an ultrasonic synthesis time of 3 hours. The ultrasonic power is adjusted to 800 W, the electric stirrer speed is set to 200 rpm / min, and 5% isooctanol polyoxyethylene ether phosphate is added, with an ultrasonic synthesis time of 1 hour. Ultrasonication and stirring are stopped, and the mixture is allowed to stand for 1 hour, thus producing the shale oil reservoir bio-nano-based percolation displacement agent product.

[0035] Example 2

[0036] This embodiment provides a shale oil reservoir bio-nano-based percolation displacement agent. Under normal temperature conditions, 32% industrial deionized water is added to an ultrasonic cleaner, and the electric stirrer is turned on with a speed of 400 rpm / min. 8% nano-active zinc oxide is slowly added to the ultrasonic cleaner at a rate of 5 kg / min, and stirred for 20 min after addition. 30% rhamnolipid is added, the ultrasonic cleaner is turned on, the ultrasonic power is set to 1500W, the electric stirrer speed is set to 250 rpm / min, and the ultrasonic synthesis time is 6 h. The ultrasonic power is adjusted to 1000W, the electric stirrer speed is set to 400 rpm / min, and 10% C12-C14 alkyl glycosides and 10% alcohol ether glycosides are added, with an ultrasonic synthesis time of 2 h. The ultrasonic power is adjusted to 500W, the electric stirrer speed is set to 250 rpm / min, and 10% isooctanol polyoxyethylene ether phosphate is added, with an ultrasonic synthesis time of 2 h. Ultrasonication and stirring are stopped, and the mixture is allowed to stand for 0.5 h to produce the shale oil reservoir bio-nano-based percolation displacement agent product.

[0037] Example 3

[0038] like Figure 1-3 As shown in the figure, this embodiment provides a shale oil reservoir bio-nano-permeation displacement agent. Under normal temperature conditions, 36% industrial deionized water is added to an ultrasonic cleaner, and the electric stirrer is turned on with the speed set to 450 rpm / min. 6.5% nano-active zinc oxide was slowly added to an ultrasonic cleaner at a rate of 3 kg / min, followed by stirring for 25 min. Then, 35% rhamnolipid was added, the ultrasonic cleaner was turned on, and the ultrasonic power was set to 1750 W, the electric mixer speed to 225 rpm / min, and the ultrasonic synthesis time to 5 h. The ultrasonic power was then adjusted to 1150 W, the electric mixer speed to 350 rpm / min, and 7.5% C12-C14 alkyl glycosides and 7.5% alcohol ether glycosides were added, with an ultrasonic synthesis time of 2.5 h. Finally, the ultrasonic power was adjusted to 650 W, the electric mixer speed to 225 rpm / min, and 7.5% isooctanol polyoxyethylene ether phosphate was added, with an ultrasonic synthesis time of 1.5 h. Ultrasonication and stirring were stopped, and the mixture was allowed to stand for 0.75 h to produce the shale oil reservoir bio-nano-based percolation displacement agent.

[0039] The percolation displacement agent prepared in Example 3 was added to water to prepare a 0.15% bio-nano percolation displacement agent. Its self-percolation test and oil displacement performance test were conducted in natural shale oil cores. A 0-1% bio-nano percolation displacement agent was also prepared, and its adsorption performance on the core surface was tested. The results are as follows: Figure 1-3 As shown, Figure 1 The self-permeation water absorption efficiency of bio-nano-based permeation displacement agents in shale oil reservoirs was tested and evaluated in natural shale oil cores. The results showed that the self-permeation water absorption capacity of 0.15% bio-nano-based permeation displacement agent was 24.2 mg, that of sodium α-alkenyl sulfonate was 17.8 mg, and that of standard brine and deionized water were 10.9 mg and 8.3 mg, respectively. The saturation time for self-permeation water absorption of the bio-nano-based permeation displacement agent was 1000 s, while that of 0.15% sodium α-alkenyl sulfonate, standard brine, and deionized water were 2400 s, 3200 s, and 3400 s, respectively. This indicates that the bio-nano-based permeation displacement agent has a large self-permeation water absorption capacity and a short saturation time, which is beneficial for permeation and displacement in shale oil reservoirs. Figure 2 The oil displacement performance of a bio-nano-based permeation displacement agent in shale oil reservoirs was evaluated in natural shale oil cores. The results showed that at 60℃, the oil displacement efficiency of 0.15% bio-nano-based permeation displacement agent in natural shale oil cores reached 17.4%, while the oil displacement efficiencies of 0.15% α-alkenyl sulfonate, standard brine, and deionized water in natural shale oil cores were 9.2%, 9.8%, and 14.5%, respectively, indicating that the bio-nano-based permeation displacement agent has good oil displacement performance. Figure 3The adsorption capacity of a bio-nano-based permeation displacement agent on the surface of 100-mesh sandstone core powder was tested. The results showed that at a concentration of 0.15%, the bio-nano-based permeation displacement agent nearly reached saturation at 19.2 mg / g on the sandstone core powder surface, with little change in adsorption increment with increasing concentration. In contrast, sodium α-alkenyl sulfonate exhibited only 1 / 3 to 1 / 2 the adsorption capacity of the bio-nano-based permeation displacement agent on the sandstone core powder surface, with a positive linear change in adsorption increment with increasing concentration. This indicates that the bio-nano-based permeation displacement agent possesses excellent monolayer adsorption and deposition capabilities and strong erosion resistance.

[0040] In the above embodiments, the nano-active zinc oxide is commercially available and has a particle size of 5-10 nm.

[0041] Test case

[0042] Twenty tons of the shale oil reservoir bio-nano-absorption displacement agent product prepared in Example 3 were transported to the site in ton-sized containers, which were then connected in parallel for later use. During the online mixing and fracturing operation of the shale oil reservoir stimulation well, the bio-nano-absorption displacement agent product was added to the guar gum fracturing fluid using a proportioning pump from a sand mixing truck, maintaining a concentration of 0.15% (mass concentration). The proportioning pump discharge rate of the sand mixing truck was adjusted according to changes in the designed discharge rate during fracturing to maintain the aforementioned concentration of the bio-nano-absorption displacement agent. After the fracturing operation of the shale oil reservoir stimulation well was completed, all valves on the wellhead tubing and casing were closed. After all wellhead valves remained closed for at least 14 days, the wellhead tubing valves were opened, and normal venting and drainage were initiated. After 20 days of these measures, the daily fluid production increased fourfold, currently averaging an increase of 2.43 tons of oil per day.

Claims

1. A shale oil reservoir bio-nano imbibition oil displacement agent, characterized in that, The osmosis oil displacement agent comprises, by weight percentage, 5-8% of nano-active zinc oxide, 30-40% of rhamnolipid, 10-20% of biological penetration agent, 5-10% of isooctanol polyoxyethylene ether phosphate, and the balance of industrial deionized water; the biological penetration agent comprises C12-C14 alkyl glycoside and alcohol ether glycoside, by weight percentage, 5-10% of C12-C14 alkyl glycoside and 5-10% of alcohol ether glycoside.

2. The shale oil reservoir bio-nano osmotic oil displacement agent according to claim 1, characterized in that, The osmosis oil displacement agent comprises, by weight percentage, 6.5% of nano-active zinc oxide, 35% of rhamnolipid, 15% of biological penetration agent, 7.5% of isooctanol polyoxyethylene ether phosphate, and 36% of industrial deionized water. 3.The shale oil reservoir biological nano-imbibition oil displacement agent according to claim 1 or 2, characterized in that, The particle size of the nano-active zinc oxide is 5-10 nm.

4. The shale oil reservoir bio-nano osmotic oil displacement agent according to claim 1, characterized in that, The osmosis oil displacement agent comprises, by weight percentage, 5% of nano-active zinc oxide, 40% of rhamnolipid, 10% of biological penetration agent, 5% of isooctanol polyoxyethylene ether phosphate, and 40% of industrial deionized water.

5. The method for preparing a shale oil reservoir bio-nano-osmosis oil displacement agent according to any one of claims 1-3, characterized in that, The method comprises the following steps: In step 1, the industrial deionized water is added into an ultrasonic cleaning instrument at the above weight percentage, an electric mixer is started, and the nano-active zinc oxide is slowly added into the ultrasonic cleaning instrument, followed by stirring for 20-30 minutes. In step 2, after stirring, the rhamnolipid is added into the ultrasonic cleaning instrument, the ultrasonic cleaning instrument is started, the first ultrasonic power is set, the stirring speed of the electric mixer is 200-250 rpm / min, ultrasonic synthesis is performed for 4-6 hours, the second ultrasonic power is adjusted, the stirring speed of the electric mixer is 300-400 rpm / min, the C12-C14 alkyl glycoside and the alcohol ether glycoside are added, ultrasonic synthesis is performed for 2-3 hours, the third ultrasonic power is adjusted, the stirring speed of the electric mixer is 200-250 rpm / min, the isooctanol polyoxyethylene ether phosphate is added, ultrasonic synthesis is performed for 1-2 hours, the ultrasonic cleaning instrument is stopped, and standing is performed to obtain the shale oil reservoir biological nano osmosis oil displacement agent.

6. The production method according to claim 5, wherein In step 1, the stirring speed of the electric mixer is 400-500 rpm / min.

7. The preparation method according to claim 5, characterized in that, In step 1, the nano-active zinc oxide is added into the ultrasonic cleaning instrument at a speed of 1-5 kg / min.

8. The preparation method according to claim 5, characterized in that, In step 2, the first ultrasonic power is 1500-2000 W, the second ultrasonic power is 1000-1300 W, and the third ultrasonic power is 500-800 W.

9. The production method according to claim 8, characterized by, The first ultrasonic power is set to 1750 W, the stirring speed of the electric mixer is 225 rpm / min, ultrasonic synthesis is performed for 5 hours, the second ultrasonic power is adjusted to 1200 W, the stirring speed of the electric mixer is 350 rpm / min, the C12-C14 alkyl glycoside and the alcohol ether glycoside are added, ultrasonic synthesis is performed for 2.5 hours, the third ultrasonic power is adjusted to 650 W, the stirring speed of the electric mixer is 230 rpm / min, the isooctanol polyoxyethylene ether phosphate is added, and ultrasonic synthesis is performed for 1.5 hours.

10. The method of claim 5, wherein, The standing time is 0.5-1 hour.

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