A sheet nanomaterial reinforced temperature-resistant environment-friendly gel and a preparation method thereof

Abstract

This invention belongs to the field of oilfield chemical technology and relates to a layered nanomaterial-reinforced, temperature-resistant, and environmentally friendly gel and its preparation method. It comprises 0.4%–0.6% AM-AMPS-NVP, 0.04%–0.06% crosslinking agent, 0.01%–0.03% gel stabilizer, with the balance being oilfield water. The gel system of this invention is entirely environmentally friendly, with low polymer concentrations and low molecular weight and concentration of the crosslinking agent. Simultaneously, the use of layered modified nanomaterials effectively enhances the gel's performance, significantly increasing its crosslinking strength and long-term thermal stability, while substantially reducing the cost of the temperature-resistant gel.

Description

Technical Field

[0001] This invention belongs to the field of oilfield chemical technology and relates to a layered nanomaterial-reinforced, temperature-resistant, and environmentally friendly gel and its preparation method. Background Technology

[0002] Water injection is a primary means of efficient development in new oilfields and for adjusting and tapping the potential of older oilfields. However, the continuous expansion of injected water, edge water, and bottom water leads to a rapid increase in well water cut and a sharp decline in oil production. Therefore, plugging and sealing have become crucial for improving the water drive sweep efficiency. Polymer gels are currently the most widely used water-blocking agents due to their low price, simple formulation, and good application results. However, in my country's high-temperature reservoirs, where temperatures can reach 120℃, ordinary polyacrylamide is prone to degradation under high temperatures, leading to gel breakdown and dehydration, resulting in poor sealing performance. Therefore, ordinary polyacrylamide gels are unsuitable for high-temperature reservoirs. Inorganic particulate plugging agents and lignin / tannin-based gel plugging agents have become the most widely used temperature- and salt-resistant water-blocking agents. Inorganic particulate plugging agents mainly refer to plugging agents composed primarily of inorganic particles such as cement and fly ash, which are injected into the formation in suspension form to achieve a plugging effect. These plugging agents have the advantage of strong plugging ability. However, a significant drawback of particulate plugging agents is that the plugging effect is rigid, lacking selectivity and easily damaging the entire reservoir. Furthermore, their injection depth is limited by particle migration capacity, making deep formation profile control impossible. Construction is difficult and operationally challenging, limiting their application; they are only suitable for plugging high-permeability, large-pore oil reservoirs. As for lignin / tannin-based gel plugging agents, because tannin and lignin molecules are rigid molecules, the resulting gels have strong temperature resistance. However, the crosslinking agents currently used in lignin / tannin-based gels are high-concentration (generally greater than 1%) aldehyde and phenolic crosslinking agents. Since both types of crosslinking agents are highly toxic, the application of such gels is detrimental to the sustainable development of oil fields.

[0003] Polyethyleneimine (PEI), as a crosslinking agent with very low toxicity, has been widely used abroad. PEI can crosslink with acrylamide and tert-butyl acrylate copolymer (PAtBA) to form a gel. However, the copolymer of polyethyleneimine and tert-butyl acrylate requires a high concentration (crosslinking agent concentration greater than 1%), and its cost is 6-8 times that of traditional gels. At the same time, PEI itself undergoes a protonation reaction in water at 80℃-95℃. When the degree of hydrolysis of HPAM polymer is relatively high, the carboxyl groups easily react directly with the ammonium groups, leading to flocculation of both, which also limits its application with HPAM, thus restricting the promotion and application of this type of environmentally friendly gel system.

[0004] Patent CN201510026327.0 provides a heat-resistant gel with the following composition by weight percentage: 0.3%–0.5% acrylamide / acryloyloxyethyltrimethylammonium chloride copolymer, 0.1%–0.5% sodium tripolyphosphate and / or sodium aminomethylphosphonate, 0.05%–0.15% phenol, 0.05%–0.1% paraformaldehyde, 0.2%–0.4% thiourea, 0.05%–0.2% sodium malonate and / or sodium D-isoascorbate, with the balance being water, and the sum of all components being 100%. The relative molecular mass of the acrylamide / acryloyloxyethyltrimethylammonium chloride copolymer is 200 × 10⁻⁶. -4 ~500×10 -4 The mass content of acryloyloxyethyltrimethylammonium chloride monomer is 10%–30%. The gelling time of the gel provided by this invention is adjustable within the range of 15–54 hours, and it has excellent temperature resistance. It shows no water loss or shrinkage after aging at 160℃ for 180 days. It can be used as a plugging agent in near-wellbore areas and deep oil wells, and can also be used to plug gas leakage during heavy oil thermal recovery. However, the crosslinking agent in this patent uses systems such as phenol, which does not meet current environmental protection requirements.

[0005] Patent CN201310497016.3 discloses a polyethyleneimine gel profile control and water shut-off agent, which is formed by the reaction of partially hydrolyzed polyacrylamide and crosslinking agent polyethyleneimine. The agent comprises the following components by weight percentage: 0.3-0.8% partially hydrolyzed polyacrylamide, 0.2-0.5% crosslinking agent polyethyleneimine, 0.3-0.8% additives, and the balance being water. The partially hydrolyzed polyacrylamide used is anionic polyacrylamide; the additives are selected from one or a mixture of several of sodium sulfite, sodium bisulfite, sodium thiosulfate, or thiourea. The profile control and water shut-off agent provided by this invention has an adjustable gelation time, high gel strength, and can seal formation water at 110℃ with a NaCl salinity of 50,000 mg / L. It exhibits good temperature resistance and does not dehydrate for 120 days. While this system uses an environmentally friendly crosslinking system, the high concentration of the crosslinking agent polyethyleneimine (0.2-0.5%) results in high cost, and reducing the concentration may prevent effective crosslinking.

[0006] Patent CN201510025766.X provides a temperature- and salt-resistant gel with low crosslinking agent content. The gel's composition by weight percentage is as follows: acrylamide / 2-acrylamido-2-methylpropanesulfonic acid copolymer 0.6%–1.2%, resorcinol 0.02%–0.04%, polyethyleneimine 0.02%–0.05%, trioxymethylene 0.02%–0.04%, alkoxysilane 0.03%–0.1%, thiourea 0.2%–0.4%, and the balance being water, with the sum of all components being 100%. The water has a mineralization of 22.4 × 10⁻⁴ mg / L and a calcium and magnesium ion content of 1.3 × 10⁻⁴ mg / L. The gel provided by this invention uses ≤0.1% crosslinking agent and shows no gel breakage after aging at 130℃ for 100 days, exhibiting excellent temperature and salt resistance. The patented composition, hydroquinone, is subject to environmental restrictions in its use, and its high polymer concentration results in high costs.

[0007] Patent CN201611094011.6 provides a high-temperature, high-mineralization gel for plugging and sealing, belonging to the field of oilfield chemical technology. Its weight composition is as follows: 0.3 to 1 part acrylamide / 2-acrylamido-2-methylpropanesulfonic acid copolymer, 0.4 to 1.0 part low-molecular-weight polyethyleneimine and / or high-molecular-weight polyethyleneimine, 0.2 to 1 part amino-based nano-silica sol and graphene oxide, 0.05 to 0.45 parts sodium sulfite and / or thiourea, 0.05 to 0.5 parts hydroxyphosphonate, and the balance being water. The sum of the weight parts of all components is 100. The low-molecular-weight polyethyleneimine has a relative molecular mass of 3000-3800, and the high-molecular-weight polyethyleneimine has a relative molecular mass of 18000-25000. The gel plugging agent provided by this invention exhibits excellent gelling properties, strong thermal stability, good viscoelasticity, and an adjustable gelling time of 15-96 hours. It can be used for water shut-off and profile control in oilfield development at temperatures of 30-170℃ and salinity of 0-100,000 mg / L. However, the high concentration and molecular weight of polyethyleneimine in this system, coupled with its high usage concentration, result in a high system cost.

[0008] Therefore, developing a temperature-resistant, environmentally friendly, and low-cost polymer gel is of great practical significance for solving the problem of large-scale profile control in oil reservoirs under high-temperature conditions. Summary of the Invention

[0009] This invention addresses the shortcomings of the prior art by providing an environmentally friendly, low-cost, temperature-resistant polymer gel for deep profile control.

[0010] On one hand, this invention discloses a temperature- and salt-resistant polymer gel with low crosslinking agent content, which is a temperature-resistant and environmentally friendly gel reinforced by sheet nanomaterials. Its mass percentage composition is as follows: AM-AMPS-NVP 0.4%~0.6%, crosslinking agent 0.04%~0.06%, gel stabilizer 0.01%-0.03%, and the balance is oilfield water, with the sum of all components being 100%.

[0011] Preferably, the relative molecular mass of the AM-AMPS-NVP is 500 × 10⁻⁶. 4 ~800×10 4 .

[0012] Preferably, the crosslinking agent is polyethyleneimine.

[0013] Preferably, the molecular weight of the polyethyleneimine is 5000-8000.

[0014] This invention uses polymers with low concentrations and crosslinking agents with low molecular weights and low concentrations.

[0015] Preferably, the gel stabilizer is modified nano-molybdenum disulfide.

[0016] Preferably, the salinity of the oilfield water is 10,000-30,000 mg / L, wherein the calcium and magnesium ion content is less than 1,000 mg / L.

[0017] Preferably, the preparation method of the modified molybdenum disulfide gel stabilizer is as follows: ammonium molybdate and thiourea are added to 100-120 mL of aqueous solution and fully dissolved. Then, 0.1-0.2 g of n-octadecyl mercaptan (ODT) is added. The mixed solution is transferred to a high-pressure reactor and heated at 180-220°C for 10-12 h. After the reaction, the precipitate is centrifuged and washed to obtain the modified molybdenum disulfide. The nanosheet molybdenum disulfide, after being modified with mercaptan, can interact with the amide groups in the polymer, thereby inhibiting its hydrolysis reaction at high temperatures. This effectively increases the crosslinking strength and long-term thermal stability of the gel and significantly reduces the cost of the heat-resistant gel.

[0018] Preferably, in the preparation method of the modified nano molybdenum disulfide, n-octadecyl mercaptan can be replaced with alkyl mercaptans with alkyl chains of 12, 14, or 16.

[0019] Another aspect of the present invention provides a method for preparing a heat-resistant and environmentally friendly gel reinforced with sheet nanomaterials:

[0020] (1) Dissolve AM-AMPS-NVP thoroughly in simulated formation water and set aside;

[0021] (2) Mix the polyethyleneimine crosslinking agent, modified molybdenum disulfide and the remaining simulated formation water according to the ratio and stir evenly; mix the two solutions evenly to obtain the gelling solution.

[0022] (3) Place the gelling solution in an ampoule, seal it with an alcohol torch, and age it in an oven at a certain temperature to obtain the above-mentioned gel. The gelling time of the gel of the present invention is adjustable from 4 to 18 hours.

[0023] A third aspect of the present invention provides the application of the above-mentioned temperature- and salt-resistant polymer gel in oilfield development.

[0024] Preferably, the above-mentioned temperature- and salt-resistant polymer gel is provided as a profile control and water-blocking agent.

[0025] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0026] Traditional heat-resistant gel plugging agents typically use toxic phenolic or aldehyde crosslinking agents, which do not meet environmental protection requirements. Furthermore, traditional polyethyleneimine gels require high concentrations or high molecular weight PEI crosslinking agents, significantly increasing gel costs. Alternatively, copolymers of acrylamide and tert-butyl acrylate are used as raw materials, which may not meet the requirements for high-temperature plugging at 120°C. The gel system of this invention is entirely environmentally friendly, with lower polymer concentrations and lower crosslinking agent molecular weights and concentrations. The use of layered modified nanomaterials effectively enhances gel performance. The molybdenum disulfide nanosheets, modified with thiol, interact with the amide groups in the polymer, inhibiting hydrolysis at high temperatures. This effectively increases the crosslinking strength and long-term thermal stability of the gel, while significantly reducing the cost of the heat-resistant gel. Detailed Implementation

[0027] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0028] On one hand, this invention discloses a temperature- and salt-resistant polymer gel with low crosslinking agent content, which is a temperature-resistant and environmentally friendly gel reinforced by sheet nanomaterials. Its mass percentage composition is as follows: AM-AMPS-NVP 0.4%~0.6%, crosslinking agent 0.04%~0.06%, gel stabilizer 0.01%-0.03%, and the balance is oilfield water, with the sum of all components being 100%.

[0029] Preferably, the relative molecular mass of the AM-AMPS-NVP is 500 × 10⁻⁶.4 ~800×10 4 .

[0030] Preferably, the crosslinking agent is polyethyleneimine.

[0031] Preferably, the molecular weight of the polyethyleneimine is 5000-8000.

[0032] This invention uses polymers with low concentrations and crosslinking agents with low molecular weights and low concentrations.

[0033] Preferably, the gel stabilizer is modified nano-molybdenum disulfide.

[0034] Preferably, the salinity of the oilfield water is 10,000-30,000 mg / L, wherein the calcium and magnesium ion content is less than 1,000 mg / L.

[0035] Preferably, the preparation method of the modified molybdenum disulfide as a gel stabilizer is as follows: ammonium molybdate and thiourea are added to 100-120 mL of aqueous solution and fully dissolved. Then, 0.1-0.2 g of n-octadecyl mercaptan (ODT) is added. The mixed solution is transferred to a high-pressure reactor and heated at 180-220°C for 10-12 h. After the reaction, the precipitate is centrifuged and washed to obtain the modified molybdenum disulfide. The nanosheet molybdenum disulfide, after being modified with mercaptan, can interact with the amide groups in the polymer, thereby inhibiting its hydrolysis reaction at high temperatures. This effectively increases the crosslinking strength and long-term thermal stability of the gel, and significantly reduces the cost of the heat-resistant gel.

[0036] Preferably, in the preparation method of the modified nano molybdenum disulfide, n-octadecyl mercaptan can be replaced with alkyl mercaptans with alkyl chains of 12, 14, or 16.

[0037] Another aspect of the present invention provides a method for preparing a heat-resistant and environmentally friendly gel reinforced with sheet nanomaterials:

[0038] (1) Dissolve AM-AMPS-NVP thoroughly in simulated formation water and set aside;

[0039] (2) Mix the polyethyleneimine crosslinking agent, modified molybdenum disulfide, and the remaining simulated formation water according to the specified ratio and stir until homogeneous; mix the two solutions together to obtain the gelling solution. Place the gelling solution in an ampoule, seal it with an alcohol torch, and age it in an oven at a certain temperature to obtain the gel.

[0040] A third aspect of the present invention provides the application of the above-mentioned temperature- and salt-resistant polymer gel in oilfield development.

[0041] Preferably, the above-mentioned temperature- and salt-resistant polymer gel is provided as a profile control and water-blocking agent.

[0042] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

[0043] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

[0044] The present invention will be further described below with reference to specific embodiments.

[0045] In this invention, all the devices or equipment used are conventional devices or equipment known in the art and are readily available.

[0046] Unless otherwise specified, all reagents used in the following examples and comparative examples are commercially available chemically pure reagents.

[0047] Example 1:

[0048] Adding 0.4% by mass of a substance with a molecular weight of 700×10 to the oilfield water 4 The gel composition consists of the polymer AM-AMPS-NVP, a 5000 molecular weight polyethyleneimine crosslinking agent (0.04%), a gel stabilizer (0.01% n-octadecyl mercaptan-modified nano-molybdenum disulfide), and the balance being oilfield water, with a total composition of 100%. The gelling solution gels at 120°C for 5 hours, yielding a gel strength of 0.068 MPa. After aging at 120°C for 20 days, the dehydration rate is less than 5%.

[0049] Example 2:

[0050] Adding 0.6% by mass of a substance with a molecular weight of 500×10 to the oilfield water 4 The gel composition consists of the polymer AM-AMPS-NVP, a polyethyleneimine crosslinking agent with a molecular weight of 8000 (0.06%), a gel stabilizer (n-dodecyl mercaptan modified nano-molybdenum disulfide) (0.03%), and the balance being oilfield water, with a total composition of 100%. The gelling solution gels at 120°C for 4 hours, yielding a gel strength of 0.074 MPa. After aging at 120°C for 20 days, the dehydration rate is less than 5%.

[0051] Example 3:

[0052] Adding 0.4% by mass of a substance with a molecular weight of 800×10 to the oilfield water 4The gel composition consists of the polymer AM-AMPS-NVP, a 5000 molecular weight polyethyleneimine crosslinking agent (0.06%), a gel stabilizer (tetradecyl mercaptan-modified nano-molybdenum disulfide, 0.03%), and the balance being oilfield water, with a total composition of 100%. The gelling solution gels at 120°C for 5 hours, yielding a gel strength of 0.068 MPa. After aging at 120°C for 20 days, the dehydration rate is less than 5%.

[0053] Example 4:

[0054] Using the gel obtained in "Example 3" as the research object, the sealing ability of the gel provided by the present invention was investigated. The specific experimental procedure is as follows: A simulated rock core, designated as 1#, was prepared by filling a sand-filled tube with quartz sand particles with an inner diameter of 2.5 cm and a length of 20 cm. After water flooding until the pressure stabilized, the original permeability k1 was obtained. Then, the gelling liquid in "Example 3" was injected into the sand-filled tube in reverse, with an injection volume of 0.3 PV (rock core pore volume). Then, 0.3 PV of water was injected for displacement. After that, the sand-filled tube was placed in a 120℃ oven for aging for 20 days. Finally, water flooding was carried out until the pressure stabilized, and the post-plugging permeability k2 of the simulated rock core was measured. The core plugging rate E was calculated according to the formula E=(k1-k2) / k1*100%. The experimental results are shown in the table below.

[0055]

[0056] The above experimental results show that the gel provided by the present invention has excellent sealing performance under high temperature conditions, which can effectively block the high permeability layer that appears in the process of water-driven crude oil, and is conducive to improving the water-driven sweep efficiency.

[0057] Comparative Example 1:

[0058] Adding 0.4% by mass of a substance with a molecular weight of 700×10 to the oilfield water 4 The mixture consists of the polymer AM-AMPS-NVP, a 5000 molecular weight polyethyleneimine crosslinking agent (0.04%), and the balance being oilfield water, with the total components comprising 100%. After 24 hours at 120°C, the viscosity of the gelling solution slightly increased, but it failed to form a gel-forming system, and its strength was below grade C.

[0059] This indicates that the system cannot form a gel of a certain strength at low concentrations without the addition of modified molybdenum disulfide.

[0060] Comparative Example 2:

[0061] Adding 0.6% by mass of a substance with a molecular weight of 500×10 to the oilfield water 4The mixture consists of the polymer AM-AMPS-NVP, a polyethyleneimine crosslinking agent with a molecular weight of 8000 (0.06%), and a gel stabilizer, nano-molybdenum disulfide (unmodified), with the balance being oilfield water. The sum of all components is 100%. After 24 hours at 120°C, the viscosity of the gelling solution increased slightly, but it could not form a molded gel system, and its strength was lower than grade C.

[0062] This indicates that the system cannot form a gel of sufficient strength when using unmodified molybdenum disulfide at low concentrations.

[0063] Comparative Example 3:

[0064] Adding 0.4% by mass of a substance with a molecular weight of 800×10 to the oilfield water 4 The mixture contains the polymer AM-AMPS-NVP, a 5000 molecular weight polyethyleneimine crosslinking agent of 0.06%, a gel stabilizer CTAB-modified nano-molybdenum disulfide of 0.03%, and the balance is oilfield water, with the total components being 100%. After 24 hours at 120°C, the viscosity of the gelling solution increased slightly, but it could not form a molded gel system, and its strength was lower than grade C.

[0065] This indicates that the system cannot form a gel of sufficient strength when using other modified molybdenum disulfide at low concentrations.

[0066] Comparative Example 4:

[0067] Adding 0.4% by mass of a substance with a molecular weight of 700×10 to the oilfield water 4 The solution contains the polymer HPAM, a 5000 molecular weight polyethyleneimine crosslinking agent of 0.04%, a gel stabilizer, octadecyl mercaptan-modified nano-molybdenum disulfide of 0.01%, and the balance is oilfield water, with the total components being 100%. This gelling solution failed to gel at 120℃, and significant flocculation and precipitation occurred in the solution.

[0068] Comparative Example 5:

[0069] Adding 0.4% by mass of a substance with a molecular weight of 700×10 to the oilfield water 4 The mixture contains AM-AMPS copolymer, 0.04% polyethyleneimine crosslinking agent with a molecular weight of 5000, 0.01% n-octadecyl mercaptan modified nano-molybdenum disulfide gel stabilizer, and the balance is oilfield water, with the sum of all components being 100%. The gelling solution has a gelling strength of grade C at 120℃ and dehydrates rapidly.

[0070] Comparative Example 6:

[0071] Using the systems obtained in "Comparative Examples 1, 2, 3, 4, and 5" as the research object, the plugging ability of the system provided by this invention was investigated. The specific experimental procedure is as follows: Simulated cores were prepared by filling sand-filled tubes with quartz sand particles in a diameter of 2.5 cm and a length of 20 cm, labeled as 1#, 2#, 3#, 4#, and 5#. After water flooding until the pressure stabilized, the original permeability k1 was obtained. Then, the gelling solution from "Comparative Examples 1, 2, 3, 4, and 5" was injected into the sand-filled tubes in reverse, with an injection volume of 0.3 PV (core pore volume). Then, 0.3 PV of water was injected for displacement. The sand-filled tubes were then aged in a 120℃ oven for 20 days. Finally, after water flooding until the pressure stabilized, the post-plugging permeability k2 of the simulated core was measured. The core plugging rate E was calculated using the formula E = (k1 - k2) / k1 * 100%. The experimental results are shown in the table below.

[0072]

[0073] The results show that the systems of Comparative Examples 1, 2, 3, 4, and 5 have a relatively small effect on blocking water flow in sand-filled pipes and cannot play an effective blocking role.

[0074] In summary, the gel provided by this invention has excellent sealing performance under high temperature conditions, which can effectively block high-permeability layers that appear during water-drive crude oil production, and is beneficial to improving the water drive sweep efficiency.

[0075] The preferred embodiments of the present invention have been described in detail above; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various technical features in any other suitable manner. These simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A layered nanomaterial-reinforced, temperature-resistant, and environmentally friendly gel, characterized in that, The mass percentage composition is as follows: AM-AMPS-NVP 0.4%~0.6%, crosslinking agent 0.04%~0.06%, gel stabilizer 0.01%-0.03%, wherein the gel stabilizer is modified nano molybdenum disulfide, and the balance is oilfield water. The sum of all components is 100%. The preparation method of the modified nano molybdenum disulfide is as follows: ammonium molybdate and thiourea are added to 100-120 mL of aqueous solution and fully dissolved. Then, 0.1-0.2 g of n-octadecyl mercaptan (ODT) is added. The mixed solution is transferred to a high-pressure reactor and heated at a reaction temperature of 180-220 ℃ for 10-12 h. After the reaction is completed, the precipitate is centrifuged and washed to obtain modified nano molybdenum disulfide.

2. The layered nanomaterial-reinforced, temperature-resistant, and environmentally friendly gel as described in claim 1, characterized in that, The relative molecular mass of the AM-AMPS-NVP is 500 × 10⁻⁶. 4 ~800×10 4 .

3. The layered nanomaterial-reinforced, temperature-resistant, and environmentally friendly gel as described in claim 1, characterized in that, The crosslinking agent is polyethyleneimine.

4. The layered nanomaterial-reinforced, temperature-resistant, and environmentally friendly gel as described in claim 3, characterized in that, The molecular weight of the polyethyleneimine is 5000-8000.

5. The layered nanomaterial-reinforced, temperature-resistant, and environmentally friendly gel as described in claim 1, characterized in that, The mineralization of the oilfield water is 10,000-30,000 mg / L, of which the calcium and magnesium ion content is less than 1,000 mg / L.

6. The layered nanomaterial-reinforced, temperature-resistant, and environmentally friendly gel as described in claim 1, characterized in that, In the preparation method of the modified nano molybdenum disulfide, n-octadecyl mercaptan is replaced with alkyl mercaptans with alkyl chains of 12, 14, or 16.

7. The layered nanomaterial-reinforced, temperature-resistant, and environmentally friendly gel as described in any one of claims 1-6, characterized in that, Includes the following steps: (1) Dissolve AM-AMPS-NVP thoroughly in simulated formation water and set aside; (2) Mix the polyethyleneimine crosslinking agent, modified nano molybdenum disulfide and the remaining simulated formation water according to the ratio and stir evenly; mix the two solutions above evenly to obtain the gelling solution; (3) Place the gelling liquid in an ampoule, seal it with an alcohol torch, and age it in an oven at a certain temperature to obtain gel.

8. The application of the layered nanomaterial-reinforced, temperature-resistant, and environmentally friendly gel as described in any one of claims 1-7 in oilfield development.

9. The application of the layered nanomaterial-reinforced, temperature-resistant, and environmentally friendly gel as described in any one of claims 1-7 as a profile control and water-blocking agent.

Images