Single self-curing resin coated sand for oil field sand control and preparation method thereof

Abstract

The present invention belongs to the technical field of preparation of coated sand for oil production, and specifically relates to a single self-curing resin coated sand for oil field sand control and a preparation method thereof. The resin coated sand is composed of the following raw materials in parts by weight: 81-83 parts of quartz sand, 1.4-1.6 parts of hydroxymethyl bisphenol A epoxy resin, 2.8-3.0 parts of nanomaterial modified bisphenol A epoxy resin, 7.1-7.3 parts of modified alicyclic amine curing agent and 10-12 parts of propylene oxide benzyl ether. The single self-curing resin coated sand for oil field sand control described in the present invention can be solidified at low temperature, and has high compressive strength and good corrosion resistance after solidification. The preparation method of the single self-curing resin coated sand for oil field sand control described in the present invention has a simple process and is easy to realize industrial production.

Description

Technical Field

[0001] The invention belongs to the technical field of preparation of coated sand for oil production, and specifically relates to single self-curing resin coated sand for oil field sand control and a preparation method thereof. Background Art

[0002] As global energy demand continues to grow, oil and gas exploration and development activities are becoming increasingly frequent. As a key material for fracturing operations, the market demand for coated sand for oil production is also rising. However, with the increase in mining depth and the emergence of complex formations, the challenges faced by coated sand for oil production are also increasing. Factors such as the increase in formation temperature and pressure, the presence of acidic environment, and the complexity of formation rocks have put forward higher requirements on the performance of coated sand for oil production.

[0003] Coated sand for oil production, as an important auxiliary material in the process of oil and gas extraction, plays an irreplaceable role. During the fracturing process of reservoir rocks, coated sand can support the cracks and prevent them from reclosing, thereby ensuring that oil and gas can flow smoothly into the wellbore. Coated sand for oil production is mainly divided into three categories: natural quartz sand, ceramsite and resin coated sand. In addition to the above three main types, there are also different types of coated sand for oil production, such as metal aluminum balls, walnut shells, glass beads, plastic balls, steel balls, etc.

[0004] Resin-coated sand is a kind of coated sand for oil production with a layer of resin film on the surface. This kind of sand has good conductivity, roundness, hardness and durability, and is suitable for fracturing operations in various complex formations and deep wells. However, the existing resin-coated sand needs to be consolidated at a higher formation temperature, and the strength after consolidation is low and the corrosion resistance is poor. Therefore, it is necessary to explore a new type of resin-coated sand. Summary of the invention

[0005] The purpose of the present invention is to provide a single self-curing resin coated sand for oil field sand control, wherein the resin coated sand has the characteristics of high compressive strength after low temperature consolidation. In addition, the present invention also provides a preparation method thereof.

[0006] The single self-curing resin coated sand for oilfield sand control of the present invention is composed of the following raw materials in parts by weight: 81-83 parts of quartz sand, 1.4-1.6 parts of hydroxymethyl bisphenol A epoxy resin, 2.8-3.0 parts of nano material modified bisphenol A epoxy resin, 7.1-7.3 parts of modified alicyclic amine curing agent and 10-12 parts of propylene oxide benzyl ether, wherein the preparation method of the nano material modified bisphenol A epoxy resin is composed of the following steps:

[0007] (1) dissolving a mixture of nano zirconium phosphate and mullite whiskers in an anhydrous ethanol solution and ultrasonically dispersing for 1-1.2 hours, then adding a titanate coupling agent, adjusting the pH value of the system to 4 with acetic acid, heating to 80-82° C. and reacting for 4 hours, centrifuging the reactants, and drying the resulting precipitate at 75-78° C. for 10 hours to prepare a mixture of modified nano zirconium phosphate and mullite whiskers;

[0008] (2) A mixture of bisphenol A epoxy resin, modified nano zirconium phosphate and mullite whiskers is placed in a reaction kettle, heated to 55-57°C and stirred for 12-14 minutes, then heated to 75-77°C and stirred for 35-37 minutes. The heating is stopped and the mixture is cooled to room temperature before being discharged. Ultrasonic dispersion is performed for 35-40 minutes to prepare nanomaterial-modified bisphenol A epoxy resin.

[0009] Wherein: the volume ratio of anhydrous ethanol to water in the anhydrous ethanol solution in step (1) is 9:1.

[0010] In step (1), the mass ratio of mullite whiskers to nano zirconium phosphate is 1:0.2-0.3.

[0011] The mass of the titanate coupling agent in step (1) is 3.5-4% of the total mass of the nano zirconium phosphate and the mullite whisker.

[0012] The titanate coupling agent in step (1) is the titanate coupling agent NDZ-311W produced by Nanjing Shuguang Chemical Group Co., Ltd., and its chemical name is a chelate of bis(dioctyloxypyrophosphate)ethylene titanate and triethanolamine.

[0013] In step (2), the mass of the mixture of modified nano zirconium phosphate and mullite whiskers accounts for 2.1-2.3% of the mass of the bisphenol A epoxy resin.

[0014] The preparation method of the modified alicyclic amine curing agent consists of the following steps:

[0015] ① Add acrylonitrile dropwise to 1,3-cyclohexanedimethylamine under stirring at room temperature. After the addition is complete, heat to 72-74°C and react for 4.0-4.2 hours, then cool down and discharge;

[0016] ② Under a nitrogen atmosphere, add 1,4-cyclohexanedimethanol diglycidyl ether to the product prepared in step ①, raise the temperature to 53-55° C. and stir evenly, then continue to raise the temperature to 85-88° C. and react for 1.7 hours, then cool to room temperature to prepare a modified alicyclic amine curing agent.

[0017] Wherein: in step ①, the molar ratio of 1,3-cyclohexanedimethylamine to acrylonitrile is 1:1.

[0018] In step ②, the molar ratio of the product prepared in step ① to 1,4-cyclohexanedimethanol diglycidyl ether is 1:1.3.

[0019] The method for preparing the single self-curing resin coated sand for oilfield sand control of the present invention comprises the following steps: stirring and mixing quartz sand, hydroxymethyl bisphenol A epoxy resin, nanomaterial modified bisphenol A epoxy resin and modified alicyclic amine curing agent for 15-20 minutes, then adding propylene oxide benzyl ether and continuing to stir and mix for 23-28 minutes, drying at room temperature and then sieving to prepare the single self-curing resin coated sand for oilfield sand control.

[0020] Wherein: the stirring and mixing speed is 200-300r / min, and the screening is through a 40-mesh sieve.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] (1) The single self-curing resin coated sand for oilfield sand control described in the present invention is selected from hydroxymethyl bisphenol A epoxy resin and nanomaterial modified bisphenol A epoxy resin for compound use. The addition of hydroxymethyl bisphenol A epoxy resin is to improve the overall reaction activity of the epoxy resin. In order to improve the brittleness of the epoxy resin after curing and improve the mechanical properties and corrosion resistance of the curing system, the bisphenol A epoxy resin is mixed and modified by adding nano zirconium phosphate and mullite whisker composite filler. Among them, the addition of nano zirconium phosphate can reduce the porosity and reduce the surface energy. When the cured epoxy resin is impacted, the nano zirconium phosphate particles in the matrix will concentrate stress, absorb part of the energy, reduce the generation and diffusion of cracks, thereby achieving the effect of toughening the epoxy resin and improving its mechanical properties. The addition of mullite whiskers can increase the density of the curing system, thereby improving its corrosion resistance. In addition, the presence of mullite whiskers can develop a directional structure without generating anisotropy, which can effectively reduce the formation of defects and play a role in increasing toughness. A modified alicyclic amine curing agent is selected as a curing agent for hydroxymethyl bisphenol A epoxy resin and nanomaterial modified bisphenol A epoxy resin. The modified alicyclic amine curing agent first uses acrylonitrile to modify 1,3-cyclohexanedimethylamine, lowers the crystallization temperature and introduces a cyano group with good bonding performance, and then reacts with 1,4-cyclohexanedimethanol diglycidyl ether to improve the curing activity, so that the prepared curing agent has the characteristics of fast curing speed at low temperature, good chemical stability and high mechanical strength of the cured product. In addition, propylene oxide benzyl ether is added to the raw material of the coated sand, so that the coated sand has a good permeability.

[0023] (2) The single self-curing resin for oilfield sand control of the present invention can be coated with sand, which can be solidified at low temperature and has high compressive strength and good corrosion resistance after solidification.

[0024] (3) The method for preparing the single self-curing resin coated sand for oil field sand control described in the present invention has a simple process and is easy to realize industrial production. DETAILED DESCRIPTION

[0025] The present invention is further described below with reference to the embodiments.

[0026] Example 1

[0027] The single self-curing resin coated sand for oilfield sand control described in Example 1 is composed of the following raw materials in parts by weight: 82 parts of quartz sand, 1.5 parts of hydroxymethyl bisphenol A epoxy resin, 2.9 parts of nanomaterial modified bisphenol A epoxy resin, 7.2 parts of modified alicyclic amine curing agent and 11 parts of propylene oxide benzyl ether, wherein the preparation method of nanomaterial modified bisphenol A epoxy resin is composed of the following steps:

[0028] (1) A mixture of nano zirconium phosphate and mullite whiskers was dissolved in anhydrous ethanol solution and ultrasonically dispersed for 1.1 h, then a titanate coupling agent was added, the pH value of the system was adjusted to 4 with acetic acid, the temperature was raised to 81°C and reacted for 4 h, the reactant was centrifuged, and the obtained precipitate was dried at 77°C for 10 h to prepare a mixture of modified nano zirconium phosphate and mullite whiskers;

[0029] (2) A mixture of bisphenol A epoxy resin, modified nano zirconium phosphate and mullite whiskers was placed in a reactor, heated to 56°C and stirred for 13 min, then heated to 76°C and stirred for 36 min. The heating was stopped and the mixture was cooled to room temperature before being discharged. Ultrasonic dispersion was performed for 38 min to prepare nanomaterial-modified bisphenol A epoxy resin.

[0030] Wherein: the volume ratio of anhydrous ethanol to water in the anhydrous ethanol solution in step (1) is 9:1.

[0031] In step (1), the mass ratio of mullite whiskers to nano zirconium phosphate is 1:0.25.

[0032] The mass of the titanate coupling agent in step (1) is 3.7% of the total mass of the nano zirconium phosphate and the mullite whisker.

[0033] The titanate coupling agent in step (1) is the titanate coupling agent NDZ-311W produced by Nanjing Shuguang Chemical Group Co., Ltd., and its chemical name is a chelate of bis(dioctyloxypyrophosphate)ethylene titanate and triethanolamine.

[0034] The mass of the mixture of modified nano zirconium phosphate and mullite whiskers in step (2) accounts for 2.2% of the mass of the bisphenol A epoxy resin.

[0035] The preparation method of the modified alicyclic amine curing agent consists of the following steps:

[0036] ① Add acrylonitrile dropwise to 1,3-cyclohexanedimethylamine under stirring at room temperature. After the addition is complete, heat to 73°C and react for 4.1 hours, then cool and discharge;

[0037] ② Under a nitrogen atmosphere, add 1,4-cyclohexanedimethanol diglycidyl ether to the product prepared in step ①, raise the temperature to 54°C and stir evenly, then continue to raise the temperature to 87°C to react for 1.7 hours, and cool to room temperature to prepare a modified alicyclic amine curing agent.

[0038] Wherein: in step ①, the molar ratio of 1,3-cyclohexanedimethylamine to acrylonitrile is 1:1.

[0039] In step ②, the molar ratio of the product prepared in step ① to 1,4-cyclohexanedimethanol diglycidyl ether is 1:1.3.

[0040] The method for preparing the single self-curing resin coated sand for oilfield sand control described in Example 1 comprises the following steps: stirring and mixing quartz sand, hydroxymethyl bisphenol A epoxy resin, nanomaterial modified bisphenol A epoxy resin and modified alicyclic amine curing agent for 16 minutes, then adding propylene oxide benzyl ether and continuing to stir and mix for 25 minutes, drying at room temperature and then sieving to prepare the single self-curing resin coated sand for oilfield sand control.

[0041] Wherein: the stirring and mixing speed is 300r / min, and the screening is through a 40-mesh sieve.

[0042] Example 2

[0043] The single self-curing resin coated sand for oilfield sand control described in Example 2 is composed of the following raw materials in parts by weight: 83 parts of quartz sand, 1.6 parts of hydroxymethyl bisphenol A epoxy resin, 2.8 parts of nanomaterial modified bisphenol A epoxy resin, 7.3 parts of modified alicyclic amine curing agent and 12 parts of propylene oxide benzyl ether, wherein the preparation method of nanomaterial modified bisphenol A epoxy resin is composed of the following steps:

[0044] (1) A mixture of nano zirconium phosphate and mullite whiskers was dissolved in anhydrous ethanol solution and ultrasonically dispersed for 1 hour, then a titanate coupling agent was added, the pH value of the system was adjusted to 4 with acetic acid, the temperature was raised to 80°C and reacted for 4 hours, the reactant was centrifuged, and the obtained precipitate was dried at 75°C for 10 hours to prepare a mixture of modified nano zirconium phosphate and mullite whiskers;

[0045] (2) A mixture of bisphenol A epoxy resin, modified nano zirconium phosphate and mullite whiskers was placed in a reactor, heated to 55°C and stirred for 12 min, then heated to 75°C and stirred for 35 min. The heating was stopped and the mixture was cooled to room temperature before being discharged. Ultrasonic dispersion was performed for 35 min to prepare nanomaterial-modified bisphenol A epoxy resin.

[0046] Wherein: the volume ratio of anhydrous ethanol to water in the anhydrous ethanol solution in step (1) is 9:1.

[0047] In step (1), the mass ratio of mullite whiskers to nano zirconium phosphate is 1:0.3.

[0048] The mass of the titanate coupling agent in step (1) is 3.5% of the total mass of the nano zirconium phosphate and the mullite whisker.

[0049] The titanate coupling agent in step (1) is the titanate coupling agent NDZ-311W produced by Nanjing Shuguang Chemical Group Co., Ltd., and its chemical name is a chelate of bis(dioctyloxypyrophosphate)ethylene titanate and triethanolamine.

[0050] The mass of the mixture of modified nano zirconium phosphate and mullite whiskers in step (2) accounts for 2.1% of the mass of the bisphenol A epoxy resin.

[0051] The preparation method of the modified alicyclic amine curing agent consists of the following steps:

[0052] ① Add acrylonitrile dropwise to 1,3-cyclohexanedimethylamine under stirring at room temperature. After the addition is complete, heat to 74°C and react for 4.2 hours, then cool down and discharge;

[0053] ② Under a nitrogen atmosphere, add 1,4-cyclohexanedimethanol diglycidyl ether to the product prepared in step ①, raise the temperature to 55° C. and stir evenly, then continue to raise the temperature to 88° C. and react for 1.7 hours, then cool to room temperature to prepare a modified alicyclic amine curing agent.

[0054] Wherein: in step ①, the molar ratio of 1,3-cyclohexanedimethylamine to acrylonitrile is 1:1.

[0055] In step ②, the molar ratio of the product prepared in step ① to 1,4-cyclohexanedimethanol diglycidyl ether is 1:1.3.

[0056] The method for preparing the single self-curing resin coated sand for oilfield sand control described in Example 2 comprises the following steps: stirring and mixing quartz sand, hydroxymethyl bisphenol A epoxy resin, nanomaterial modified bisphenol A epoxy resin and modified alicyclic amine curing agent for 20 minutes, then adding propylene oxide benzyl ether and continuing to stir and mix for 28 minutes, drying at room temperature and then sieving to prepare the single self-curing resin coated sand for oilfield sand control.

[0057] Wherein: the stirring and mixing speed is 250r / min, and the screening is through a 40-mesh sieve.

[0058] Example 3

[0059] The single self-curing resin coated sand for oilfield sand control described in Example 3 is composed of the following raw materials in parts by weight: 81 parts of quartz sand, 1.4 parts of hydroxymethyl bisphenol A epoxy resin, 3.0 parts of nanomaterial modified bisphenol A epoxy resin, 7.1 parts of modified alicyclic amine curing agent and 10 parts of propylene oxide benzyl ether, wherein the preparation method of the nanomaterial modified bisphenol A epoxy resin is composed of the following steps:

[0060] (1) A mixture of nano zirconium phosphate and mullite whiskers was dissolved in anhydrous ethanol solution and ultrasonically dispersed for 1.2 h, and then a titanate coupling agent was added, and the pH value of the system was adjusted to 4 with acetic acid, and the temperature was raised to 82°C for reaction for 4 h. The reactant was centrifuged, and the obtained precipitate was dried at 78°C for 10 h to prepare a mixture of modified nano zirconium phosphate and mullite whiskers;

[0061] (2) A mixture of bisphenol A epoxy resin, modified nano zirconium phosphate and mullite whiskers was placed in a reactor, heated to 57°C and stirred for 14 min, then heated to 77°C and stirred for 37 min. The heating was stopped and the mixture was cooled to room temperature before being discharged. Ultrasonic dispersion was performed for 40 min to prepare nanomaterial-modified bisphenol A epoxy resin.

[0062] Wherein: the volume ratio of anhydrous ethanol to water in the anhydrous ethanol solution in step (1) is 9:1.

[0063] In step (1), the mass ratio of mullite whiskers to nano zirconium phosphate is 1:0.2.

[0064] The mass of the titanate coupling agent in step (1) is 4% of the total mass of the nano zirconium phosphate and the mullite whisker.

[0065] The titanate coupling agent in step (1) is the titanate coupling agent NDZ-311W produced by Nanjing Shuguang Chemical Group Co., Ltd., and its chemical name is a chelate of bis(dioctyloxypyrophosphate)ethylene titanate and triethanolamine.

[0066] The mass of the mixture of modified nano zirconium phosphate and mullite whiskers in step (2) accounts for 2.3% of the mass of the bisphenol A epoxy resin.

[0067] The preparation method of the modified alicyclic amine curing agent consists of the following steps:

[0068] ① Add acrylonitrile dropwise to 1,3-cyclohexanedimethylamine under stirring at room temperature. After the addition is complete, heat to 72°C and react for 4.0 hours, then cool down and discharge;

[0069] ② Under a nitrogen atmosphere, add 1,4-cyclohexanedimethanol diglycidyl ether to the product prepared in step ①, raise the temperature to 53° C. and stir evenly, then continue to raise the temperature to 85° C. and react for 1.7 hours, then cool to room temperature to prepare a modified alicyclic amine curing agent.

[0070] Wherein: in step ①, the molar ratio of 1,3-cyclohexanedimethylamine to acrylonitrile is 1:1.

[0071] In step ②, the molar ratio of the product prepared in step ① to 1,4-cyclohexanedimethanol diglycidyl ether is 1:1.3.

[0072] The preparation method of the single self-curing resin coated sand for oilfield sand control described in Example 3 comprises the following steps: stirring and mixing quartz sand, hydroxymethyl bisphenol A epoxy resin, nanomaterial modified bisphenol A epoxy resin and modified alicyclic amine curing agent for 15 minutes, then adding propylene oxide benzyl ether and continuing to stir and mix for 23 minutes, drying at room temperature and then sieving to prepare the single self-curing resin coated sand for oilfield sand control.

[0073] Wherein: the stirring and mixing speed is 200r / min, and the screening is through a 40-mesh sieve.

[0074] Comparative Example 1

[0075] The method for preparing the single self-curing resin coated sand for oilfield sand control described in this comparative example 1 is the same as that in Example 1, the only difference being that the nanomaterial-modified bisphenol A epoxy resin in Example 1 is replaced by bisphenol A epoxy resin.

[0076] Comparative Example 2

[0077] The preparation method of the single self-curing resin coated sand for oil field sand control described in this comparative example 2 is the same as that in Example 1, and the raw material composition of the resin coated sand is also the same. The only difference is that the preparation method of the modified alicyclic amine curing agent in the raw material is different. The preparation method of the modified alicyclic amine curing agent described in comparative example 2 consists of the following steps: adding acrylonitrile to 1,3-cyclohexanedimethylamine under stirring at room temperature, heating to 73°C after the addition is completed to react for 4.1 hours, and then cooling to room temperature and discharging to prepare the modified alicyclic amine curing agent, wherein the molar ratio of 1,3-cyclohexanedimethylamine to acrylonitrile in step ① is 1:1.

[0078] The resin-coated sand prepared in Examples 1-3 and Comparative Examples 1-2 was placed in a 25°C constant temperature water bath for 10 minutes, taken out and placed in a core mold, pressurized to 10 MPa with a hand pump, maintained at a pressure of 1 minute, and cured in a 25°C constant temperature water bath in a neutral environment for 24 hours to test its consolidated compressive strength. The corrosion resistance test was to immerse the consolidated product in clean water, 1.2% NaOH strong alkali solution, and 1.2% Na2CO3 weak alkali solution for 3 days and then test its compressive strength. The results are shown in Table 1 below:

[0079] Table 1 Performance test results of resin-coated sand prepared in Examples 1-3 and Comparative Examples 1-2

[0080]

[0081] It can be seen from Table 1 above that the performance of the resin-coated sand prepared in Examples 1-3 is better than that in Comparative Examples 1-2. The bisphenol A epoxy resin used in Comparative Example 1 is not modified with a mixture of nano zirconium phosphate and mullite whiskers, and the modified alicyclic amine curing agent described in Comparative Example 2 only introduces a cyano group into 1,3-cyclohexanedimethylamine for modification. Compared with Example 1 of the present application, the mechanical properties and corrosion resistance of the resin-coated sand prepared in Comparative Examples 1-2 are far worse than those in Example 1. It can be seen that the raw materials of the resin-coated sand described in Examples 1-3 of the present application synergize with each other.

Claims

1. A single self-curing resin coated sand for oilfield sand control, characterized in that: The method comprises the following raw materials in parts by weight: 81-83 parts of quartz sand, 1.4-1.6 parts of hydroxymethyl bisphenol A epoxy resin, 2.8-3.0 parts of nanomaterial modified bisphenol A epoxy resin, 7.1-7.3 parts of modified alicyclic amine curing agent and 10-12 parts of propylene oxide benzyl ether. The preparation method of nanomaterial modified bisphenol A epoxy resin comprises the following steps: (1) dissolving a mixture of nano zirconium phosphate and mullite whiskers in an anhydrous ethanol solution and ultrasonically dispersing for 1-1.2 hours, then adding a titanate coupling agent, adjusting the pH value of the system to 4 with acetic acid, heating to 80-82° C. and reacting for 4 hours, centrifuging the reactants, and drying the resulting precipitate at 75-78° C. for 10 hours to prepare a mixture of modified nano zirconium phosphate and mullite whiskers; (2) placing a mixture of bisphenol A epoxy resin and modified nano zirconium phosphate and mullite whiskers into a reaction kettle, heating to 55-57°C and stirring for 12-14 minutes, then heating to 75-77°C and stirring for 35-37 minutes, stopping heating and cooling to room temperature before discharging the material, and ultrasonically dispersing for 35-40 minutes to prepare nanomaterial modified bisphenol A epoxy resin; The preparation method of the modified alicyclic amine curing agent consists of the following steps: ① Add acrylonitrile dropwise to 1,3-cyclohexanedimethylamine under stirring at room temperature. After the addition is complete, heat to 72-74°C and react for 4.0-4.2 hours, then cool down and discharge; ② Under a nitrogen atmosphere, add 1,4-cyclohexanedimethanol diglycidyl ether to the product prepared in step ①, raise the temperature to 53-55° C. and stir evenly, then continue to raise the temperature to 85-88° C. and react for 1.7 hours, then cool to room temperature to prepare a modified alicyclic amine curing agent.

2. The single self-curing resin coated sand for oilfield sand control according to claim 1, characterized in that: The volume ratio of anhydrous ethanol to water in the anhydrous ethanol solution in step (1) is 9:

1.

3. The single self-curing resin coated sand for oilfield sand control according to claim 1, characterized in that: In step (1), the mass ratio of mullite whiskers to nano zirconium phosphate is 1:0.2-0.

3.

4. The single self-curing resin coated sand for oilfield sand control according to claim 1, characterized in that: The mass of the titanate coupling agent in step (1) is 3.5-4% of the total mass of the nano zirconium phosphate and the mullite whisker.

5. The single self-curing resin coated sand for oilfield sand control according to claim 1, characterized in that: In step (2), the mass of the mixture of modified nano zirconium phosphate and mullite whiskers accounts for 2.1-2.3% of the mass of the bisphenol A epoxy resin.

6. The single self-curing resin coated sand for oilfield sand control according to claim 1, characterized in that: In step ①, the molar ratio of 1,3-cyclohexanedimethylamine to acrylonitrile is 1:

1.

7. The single self-curing resin coated sand for oilfield sand control according to claim 1, characterized in that: In step ②, the molar ratio of the product prepared in step ① to 1,4-cyclohexanedimethanol diglycidyl ether is 1:1.

3.

8. A method for preparing the single self-curing resin coated sand for oilfield sand control according to claim 1, characterized in that: The method comprises the following steps: stirring and mixing quartz sand, hydroxymethyl bisphenol A epoxy resin, nanomaterial modified bisphenol A epoxy resin and modified alicyclic amine curing agent for 15-20 minutes, then adding propylene oxide benzyl ether and continuing stirring and mixing for 23-28 minutes, drying at room temperature and then sieving to prepare single self-curing resin coated sand for oilfield sand control.

9. The method for preparing the single self-curing resin coated sand for oilfield sand control according to claim 8, characterized in that: The stirring and mixing speed is 200-300r / min, and the screening is through a 40-mesh sieve.

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