CN101666225B

CN101666225B - The proppant that a kind of surface is modified

Info

Publication number: CN101666225B
Application number: CN200810146578.2A
Authority: CN
Inventors: 秦升益
Original assignee: Beijing Rechsand Science and Technology Group Co Ltd
Current assignee: Beijing Rechsand Science and Technology Group Co Ltd
Priority date: 2008-09-04
Filing date: 2008-09-04
Publication date: 2017-12-26
Anticipated expiration: 2028-09-04
Also published as: CN101666225A

Abstract

The present invention relates to the proppant that a kind of surface is modified, including matrix and matrix clad, described matrix clad is formed by cured dose of solidification of resin, and it is added with high molecular surfactant, lubricant and hydrophobic polymer, wherein described resin and the weight ratio of described matrix are 0.1 15: 100, the curing agent accounts for 5 30wt% of the weight resin, the high molecular surfactant accounts for 0.1 5wt% of the weight resin, the lubricant accounts for 0.1 10wt% of the weight resin, the hydrophobic polymer accounts for 0.1 10wt% of the weight resin.The proppant of the present invention has the advantages of resistance to environmental attack ability is stable.

Description

Surface modified proppant

Technical Field

The invention belongs to an oil and gas well propping agent in the field of oil field exploitation, and particularly relates to a preparation method of an oil and gas well propping agent in the field of oil field exploitation.

Background

Because the crude oil in the oil field has high viscosity, the rock stratum has low void ratio and poor void connectivity, great difficulty is brought to the oil extraction work. In order to increase the yield of crude oil and the rate of oil recovery, proppants are commonly used to increase formation voids and void connectivity. At first, quartz sand, ceramsite sand and the like are directly used as propping agents, but a large amount of fragments and fine silt are generated due to the fact that the propping agents need to bear large impact force and closing stress in the using process, and the fragments and the fine silt can block cracks so as to reduce the flow conductivity of the cracks. Therefore, at present, one or more resin films are generally coated on a substrate of a proppant such as quartz sand, ceramsite sand and the like to improve the fracture resistance of the proppant. However, due to the complicated downhole environment, the resin film on the surface of the proppant may be corroded by oil, oil gas, water, brine, steam, acid-base corrosive liquid, microorganisms and the like which are usually accompanied with the corrosion, degradation, falling off and the like of the coating layer, so that the flow conductivity of the fracture of the rock stratum is greatly reduced.

U.S. patent 2005244641 discloses a preparation method of a surface-modified oil and gas well hydraulic fracturing propping agent, namely a layer of hydrophobic substance is coated on the surface of a propping agent substrate, so that the environmental corrosion resistance of the propping agent is improved. The specific implementation mode is that sand grains are soaked in a hydrophobic substance, and after tens of minutes, the sand grains are taken out and dried. However, the prior art method still has the following defects: the purpose of modifying the surface resin layer of the propping agent is achieved by adopting a coating method, the hydrophobic polymer is attached to the resin layer, and due to the concentration difference between the inside and the outside of the resin layer, the hydrophobic polymer migrates to the inside of the resin layer through the permeation action and is wound in a resin network, so that the corrosion resistance of the resin layer is improved. On one hand, the hydrophobic macromolecules are only physically wound and fixed on the surface layer of the resin layer under weak acting force, and stronger acting force does not exist between the hydrophobic macromolecules and the resin layer to tightly combine the hydrophobic macromolecules and the resin layer; on the other hand, due to the fact that the potential energy of the surface of a substance is reduced, the potential energy of the surface of the hydrophobic macromolecule is low, the hydrophobic macromolecule is easy to migrate to the outer layer of the resin and is not easy to migrate to the inner part of the resin network, the acting force between the hydrophobic macromolecule and the resin layer is reduced, and therefore under the impact of the fracturing fluid, the hydrophobic layer is easy to fall off and the effect of improving the corrosion resistance of the proppant is lost; in addition, the hydrophobic substance is prepared into an aqueous solution, so that the concentration of the used spraying liquid or dipping liquid is not high, the content of the hydrophobic substance coated on the surface of the proppant is low, and the modification effect of the hydrophobic substance is not obvious.

Disclosure of Invention

Therefore, the technical problem to be solved by the invention is as follows: the defect that the surface hydrophobic layer of the surface-modified proppant is easy to fall off so that the corrosion resistance of the proppant is unstable in the prior art is overcome, and the proppant with stable corrosion resistance is provided.

In order to solve the technical problems, the invention provides a surface modified proppant which comprises a substrate and a substrate coating layer, wherein the substrate coating layer is formed by curing resin through a curing agent and is added with a high-molecular surfactant, a lubricant and a hydrophobic high polymer. The matrix coating is formed by adding a curing agent, a high molecular surfactant and a lubricant into resin under a heating condition and adding a hydrophobic high polymer into the resin. Wherein the weight ratio of the resin to the matrix is from 0.1 to 15:100, preferably from 2 to 10: 100; the added curing agent accounts for 5-30 wt%, preferably 10-20 wt% of the weight of the resin; the added macromolecular surfactant accounts for 0.1-5 wt%, preferably 0.2-1 wt% of the weight of the resin; the lubricant is added in an amount of 0.1 to 10 wt%, preferably 2 to 5 wt%, based on the weight of the resin; the hydrophobic polymer is added in an amount of 0.1-10 wt%, preferably 0.2-2 wt%, based on the weight of the resin.

The hydrophobic polymer is one or more of polysiloxane, polysiloxane derivatives, polyolefin and halogenated polyolefin. The hydrophobic units in the polymeric surfactant correspond to the hydrophobic groups in the hydrophobic polymer.

The average particle size of the base is 0.3-1.2mm, and the average particle size of the base is preferably 0.45-0.85 mm.

The matrix coating layer also comprises a plasticizer, and the plasticizer accounts for 1-30 wt% of the weight of the resin. The plasticizer is one or more of phthalate ester, aliphatic dibasic acid ester and phosphate ester, and accounts for 10-20 wt% of the resin.

The resin is phenolic resin, and the corresponding curing agent is one or more of paraformaldehyde and hexamethylenetetramine; or the resin is furan resin, and the corresponding curing agent is one or more of benzenesulfonic acid, toluenesulfonic acid and xylenesulfonic acid; or the resin is epoxy resin, and the corresponding curing agent is one or more of aliphatic amine and addition product thereof, tertiary amine and salt thereof, aromatic amine and modified product thereof, and imidazole; or the resin is unsaturated polyester resin, and the corresponding curing agent is one or more of peroxyacyl and peroxyester; or the resin is vinyl resin, and the corresponding curing agent is one or more of peroxyacyl and peroxyester.

The substrate is quartz sand and/or ceramsite sand, and the lubricant is one or more of polyethylene wax, oxidized polyethylene wax, stearic acid amide, ethylene bis-stearic acid amide, calcium stearate and zinc stearate.

Compared with the prior art, the invention has the following advantages:

(1) in the invention, a polymer surfactant and a hydrophobic polymer are introduced into the coating layer on the surface of the matrix, and the hydrophobic unit of the polymer surfactant corresponds to the hydrophobic group in the hydrophobic polymer, so that the interaction force between the hydrophobic polymer mainly distributed on the surface layer of the proppant and the resin in the coating layer of the matrix is greatly enhanced, and the stability of the environment erosion resistance of the proppant after surface modification in a rock stratum is improved.

(2) In the process of preparing the proppant, no matter a spray dipping method or a direct curing method is adopted, the content of the hydrophobic macromolecules is not limited by the concentration of the solution, so that the loading capacity of the macromolecular surfactant in the proppant can be greatly improved, the modification effect of the proppant is obvious, and the environmental corrosion resistance effect is better.

Detailed Description

The proppant of the present invention can be prepared by two methods, one is a spray-dipping method, and the other is a direct curing method. These two preparation methods are described below separately.

The spray dipping method comprises the following steps:

(a) the matrix of proppant was heated to 100-.

(b) Adding resin into the heated matrix and stirring to form a uniformly mixed mixture, uniformly dispersing the resin around the matrix in a sufficient mixing process to form a coating on the surface of the matrix, and then adding a curing agent and sufficiently stirring to enable the resin coated on the surface of the matrix to start curing. Wherein the weight ratio of resin to matrix is 0.1-15:100, preferably 2-10: 100. In the method, a plasticizer can be added before the curing agent is added, and the addition amount of the plasticizer is 1-30 wt%, preferably 10-20 wt% of the weight of the resin.

(c) And c, adding a lubricant and a high molecular surfactant before the resin-matrix mixture obtained in the step b starts to be agglomerated and fully stirring. The addition amount of the curing agent is 5-30 wt%, preferably 10-20 wt% of the weight of the resin; the lubricant is added in an amount of 0.1 to 10 wt%, preferably 2 to 5 wt%, based on the weight of the resin; the addition amount of the polymeric surfactant is 0.1-5 wt%, preferably 0.2-1 wt% of the weight of the resin.

(d) And c, cooling, crushing and screening the mixture in the step c to obtain the front proppant.

(e) And d, spraying, soaking or soaking the front proppant prepared in the step d by using a hydrophobic high molecular organic solution, and finally drying to obtain a finished proppant.

Compared with the low molecular surfactant, the high molecular surfactant added in the step c of the method has better dispersibility and thickening property, so that the added lubricant can be more uniformly dispersed around the matrix coated with the resin film; on the other hand, due to the trend of decreasing surface tension, the nonpolar hydrophobic units on the long-chain macromolecular surfactant continuously migrate to the outer layer of the resin film in the process of resin curing, so that the non-hydrophobic units are tightly entangled with a cross-linking network generated in the process of resin curing and most of the hydrophobic units are present on the surface layer of the resin film, meanwhile, as the hydrophobic groups in the hydrophobic macromolecules introduced and coated on the surface of the resin film in the subsequent step e correspond to the hydrophobic units in the macromolecular surfactant, and the same groups have strong affinity, so that strong electrostatic attraction is formed between the hydrophobic macromolecules and the hydrophobic units on the macromolecular surfactant on the surface layer of the resin film, and the acting force is not easily damaged under acid-base environment and high-pressure impact, and the hydrophobic macromolecules can be firmly coated on the surface of the front support agent, has strong stability.

A direct cure process comprising the steps of:

(a) the matrix of proppant was heated to 100-.

(b) Adding resin into the heated matrix and stirring to form a uniformly mixed mixture, uniformly dispersing the resin around the matrix and forming a coating on the surface of the matrix through a sufficient mixing process, then adding a high molecular surfactant and a curing agent and sufficiently stirring to uniformly disperse the high molecular surfactant and the curing agent around the matrix coated with the resin, and enabling the resin coated on the surface of the matrix to start to be cured through the curing agent. Wherein the weight ratio of the resin to the matrix is 0.1-15:100, preferably 2-10:100, and the proppant prepared in the range has better strength and other properties. In this step, a plasticizer may be added before the addition of the curing agent, and the amount of the plasticizer added is 1 to 30 wt%, preferably 10 to 20 wt%, based on the weight of the resin.

(c) And c, adding a lubricant and hydrophobic macromolecules before the resin-matrix mixture obtained in the step b starts to be agglomerated and fully stirring. The addition amount of the high molecular surfactant is 0.1-5 wt%, preferably 0.2-1 wt% of the weight of the resin; the addition amount of the curing agent is 5-30 wt%, preferably 10-20 wt% of the weight of the resin; the lubricant is added in an amount of 0.1 to 10 wt%, preferably 2 to 5 wt%, based on the weight of the resin; the amount of the hydrophobic polymer added is 0.1-10 wt%, preferably 0.2-2 wt% of the weight of the resin.

(d) And c, cooling, crushing and screening the mixture in the step c to obtain the proppant.

Compared with the low molecular surfactant, the high molecular surfactant added in the step b of the method has better dispersibility and thickening property, so that the added curing agent, lubricant and hydrophobic polymer can be dispersed more uniformly around the matrix coated with the resin film; on the other hand, due to the tendency of decreasing surface tension, the non-polar hydrophobic units on the long-chain polymer surfactant continuously migrate to the outer layer of the resin film during the resin curing process, so that the non-hydrophobic units are formed to be closely entangled with the cross-linked network generated during the resin curing process and the hydrophobic units are basically present on the surface layer of the resin film, in the subsequent step d, the hydrophobic groups in the hydrophobic polymers introduced during the resin curing process correspond to the hydrophobic units in the polymer surfactant, and because the same groups have strong affinity, strong electrostatic attraction is formed between the hydrophobic polymers and the hydrophobic units on the polymer surfactant on the surface layer of the resin layer, so that the hydrophobic polymers gradually migrate to the surface layer of the resin layer through the electrostatic attraction during the resin curing process, namely, a corrosion-resistant hydrophobic layer is formed on the surface of the resin layer, wherein the polymer surfactant plays a role in tightly connecting the hydrophobic polymer and the resin. The acting force is not easy to be damaged under acid-base environment and high-pressure impact to cause the degradation and falling of the resin layer, and the hydrophobic polymer basically positioned on the surface layer of the propping agent can be firmly combined with the resin, so that the corrosion resistance of the propping agent is improved, and the stability of the corrosion resistance is also improved. In general, a polymeric surfactant has a hydrophilic unit and a hydrophobic unit, and thus can function as a surfactant due to its structure.

The present invention will be further illustrated by the following specific examples.

Example 1

10kg of quartz sand with the average particle size of 0.45mm is heated to 300 ℃, then is put into a sand mixer to be stirred and is cooled to 200 ℃. Adding 1kg of phenolic resin into the heated quartz sand, uniformly stirring to form a mixture, and then adding 0.2kg of hexamethylenetetramine, and uniformly stirring. When the phenolic resin-quartz sand mixture starts to agglomerate, 0.05kg of calcium stearate and 0.01kg of polyether dimethyl siloxane are added and stirred uniformly. And cooling, crushing and sieving the obtained mixture to obtain the front proppant of the proppant before the proppant is not coated with the hydrophobic polymer.

The front support is soaked in a dichloromethane solution of polydimethylsiloxane with the concentration of 50 wt%, and after soaking for 2 hours, the front support is dried at normal temperature to obtain the support S1 with the polydimethylsiloxane content of 0.02 kg.

In this example, the purpose of heating is to provide a certain reaction temperature in the next step. In practical operation, the substrate may be heated to a higher temperature, such as 150-.

Hexamethylenetetramine is used as a curing agent to cure the resin on the surface of the quartz sand to form a resin layer with certain strength. The calcium stearate serves as a lubricant to enable the cured resin-matrix mixture to be more easily processed into particles and to ensure the integrity of the resin film and the smoothness of the surface, and to ensure that the proppant has excellent crush resistance during use.

Example 2

10kg of ceramsite sand with an average particle size of about 0.85mm is heated to 260 ℃ and then placed into a sand mixer to be stirred and cooled to 150 ℃. And adding 0.2kg of furan resin into the heated ceramsite sand, uniformly stirring to form a mixture, then adding 0.04kg of dibutyl phthalate, then adding 0.02kg of a mixture of benzenesulfonic acid and toluenesulfonic acid, and uniformly stirring. When the furan resin-ceramsite sand mixture begins to agglomerate, 0.004kg of ethylene bis stearamide and 0.01kg of polyether methyl hydrogen siloxane are added and stirred uniformly. And cooling, crushing and sieving the obtained mixture to obtain the front proppant of the proppant before the proppant is not coated with the hydrophobic polymer.

The front support agent is soaked in dichloromethane solution of polymethylhydrosiloxane with the concentration of 150 wt%, and is dried at normal temperature after being soaked for 1 hour to obtain the support agent S2 with the polymethylhydrosiloxane content of 0.02 kg.

Dibutyl phthalate acts as a plasticizer to improve the properties of the resin film, reduce its brittleness and increase its resistance to fracture.

Example 3

10kg of a mixture of quartz sand and ceramsite sand having an average particle size of about 0.3mm was heated to 300 ℃ and then stirred in a sand mixer and cooled to 240 ℃. 1.5kg of furan resin was added to the heated mixture of the quartz sand and the ceramsite sand and stirred uniformly to form a mixed material, and then 0.045kg of diisooctyl phthalate was added, and 0.045kg of xylene sulfonic acid was added and stirred uniformly. 0.15kg of a mixture of polyethylene wax and polyethylene wax oxide and 0.003kg of polyhydroxyvinylmethylhydrogensiloxane are added and stirred uniformly before the mixture of furan resin-quartz sand and ceramsite sand begins to agglomerate. And cooling, crushing and sieving the obtained mixture to obtain the front proppant of the proppant before the proppant is not coated with the hydrophobic polymer.

The front support agent is soaked in an ethanol solution of polymethylhydrosiloxane with the concentration of 80 wt% in the same volume, and is dried at normal temperature after being soaked for 2 hours to obtain the support agent S3 with the polymethylhydrosiloxane content of 0.006 kg.

Example 4

10kg of quartz sand with an average particle size of about 1.2mm is heated to 260 ℃ and then put into a sand mixer to be stirred and cooled to 150 ℃. Adding 0.01kg of epoxy resin into the heated quartz sand, uniformly stirring to form a mixture, then adding 0.001kg of dibutyl adipate, then adding 0.002kg of aliphatic amine curing agent, and uniformly stirring. When the epoxy resin-quartz sand mixture begins to agglomerate, 0.001kg of stearic acid amide and 0.0005kg of polyvinyl chloride ether are added and stirred uniformly. And cooling, crushing and sieving the obtained mixture to obtain the front proppant of the proppant before the proppant is not coated with the hydrophobic polymer.

Continuously spraying carbon disulfide solution of polyvinyl chloride with the concentration of 10 wt% on the front supporting agent, stopping spraying after the front supporting agent is completely soaked, and drying at normal temperature to obtain the supporting agent S4 with the polyvinyl chloride alkyl content of 0.0004 kg.

Example 5

10kg of quartz sand with an average particle size of about 0.65mm was heated to 300 ℃ and then placed in a sand mixer to be stirred and cooled to 200 ℃. 1kg of unsaturated polyester resin is added into the heated quartz sand and stirred uniformly to form a mixture, then 0.001kg of polyisobutylene ether and 0.01kg of diisooctyl sebacate are added, and 0.15kg of acyl peroxide curing agent is added and stirred uniformly. When the unsaturated polyester resin-quartz sand mixture begins to agglomerate, 0.001kg of zinc stearate and 0.002kg of polyisobutylene are added and stirred uniformly. The resulting mixture was cooled, crushed, and sieved to obtain proppant S5.

Example 6

10kg of ceramsite sand with an average particle size of about 0.45mm is heated to 300 ℃ and then put into a sand mixer to be stirred and cooled to 200 ℃. Adding 0.5kg of vinyl resin into the heated ceramsite sand, uniformly stirring to form a mixture, then adding 0.0025kg of polyether methyl hydrogen siloxane, 0.075kg of triphenyl phosphate, and then adding 0.075kg of peroxyl curing agent, and uniformly stirring. When the vinyl resin-ceramsite sand mixture begins to agglomerate, 0.015kg of calcium stearate and 0.005kg of polymethylhydrosiloxane are added and stirred uniformly. The resulting mixture was cooled, crushed, and sieved to obtain proppant S6.

Example 7

10kg of quartz sand with an average particle size of about 0.75mm was heated to 300 ℃ and then placed in a sand mixer to be stirred and cooled to 200 ℃. 1kg of phenolic resin is added into the heated quartz sand and stirred uniformly to form a mixture, then 0.001kg of polyether siloxane, 0.25kg of tricresyl phosphate and triisooctyl phosphate are added, and 0.25kg of hexa-polyformaldehyde is added and stirred uniformly. When the phenolic resin-quartz sand mixture starts to agglomerate, 0.04kg of calcium stearate and 0.001kg of polydimethylsiloxane are added and stirred uniformly. The resulting mixture was cooled, crushed, and sieved to obtain proppant S7.

Example 8

10kg of quartz sand with an average particle size of about 0.45mm is heated to 300 ℃ and then put into a sand mixer to be stirred and cooled to 200 ℃. 1kg of phenolic resin is added into the heated quartz sand and stirred evenly to form a mixture, then 0.003kg of polyether siloxane and 0.25kg of triisooctyl phosphate are added, and 0.25kg of hexamethylenetetramine is added and stirred evenly. 0.25kg of hexamethylenetetramine is stirred in a homogeneous manner. When the phenolic resin-quartz sand mixture starts to agglomerate, 0.07kg of calcium stearate and 0.01kg of polydimethylsiloxane are added and stirred uniformly. The resulting mixture was cooled, crushed, and sieved to obtain proppant S8.

Comparative example 1

10kg of quartz sand with an average particle size of about 0.45mm is heated to 300 ℃ and then put into a sand mixer to be stirred and cooled to 200 ℃. Adding 1kg of phenolic resin into the heated quartz sand, uniformly stirring to form a mixture, and then adding 0.2kg of hexamethylenetetramine, and uniformly stirring. When the phenolic resin-quartz sand mixture starts to agglomerate, 0.05kg of calcium stearate is added and stirred uniformly. And cooling, crushing and sieving the obtained mixture to obtain the front proppant of the proppant before the proppant is not coated with the hydrophobic polymer.

The front support agent is soaked in polydimethylsiloxane aqueous solution with the concentration of 5 wt%, and after soaking for 2 hours, the front support agent is dried at normal temperature to obtain the support agent C1.

Evaluation examples

The samples from examples 1 to 8 and comparative example 1 were tested for acid solubility, turbidity and proppant conductivity using the samples from S1 to S8 and C1. Wherein,

the acid solubility refers to the percentage of the mass of the proppant dissolved by the acid to the original mass of the proppant in a specified acid solution and acid dissolution time, and the specific operating conditions are as follows: each proppant was immersed in a 0.5mol/L phosphoric acid solution for 1 hour, washed and dried, and then each weight was measured to calculate the weight dissolved, and the acid solubility was measured by the method described above.

Turbidity is measured by adding a certain amount of support into a specified volume of distilled water, heating at 50 deg.C for 60 min, and stirring for a while.

The test condition of the flow conductivity of the proppant is that in an API standard flow guide chamber, an equal mass measurement method is adopted, and the sand laying concentration is 5.0kg/m²The test fluid was a 2 wt% KCl solution and the closure pressure was 20 MPa.

The results of the above tests are shown in Table 1.

Examples 1-4 were prepared using a spray dip method to provide proppants S1-S4, and examples 5-8 were prepared using a direct cure method to provide proppants S5-S8. As can be seen from the data in Table 1, compared with the proppant C1 without adding high molecular surfactant, the proppant prepared by the method of the invention, whether the spray dipping method or the direct curing method is adopted, has improved acid corrosion resistance, obviously reduces the substances dissolved out in water, meanwhile, the water-based composite material still has excellent flow conductivity under higher closing pressure, which shows that the hydrophobic macromolecules mainly distributed on the surface layer of the proppant have more obvious and stable effects of resisting the erosion of substances such as water, acid and the like, further shows that the acting force between the hydrophobic macromolecules and the resin on the matrix is greatly increased, has stronger erosion resistance in the environment, can avoid the fracture of the propping agent caused by the shedding of a resin layer due to the erosion of the propping agent in a short time in practical application, thereby causing the defect of the reduction of the conductivity of the gaps of the rock stratum and correspondingly prolonging the service life of the propping agent.

Comparing the properties of S1, S2, S3 and S4, it can be seen that too large or too small a particle size of the proppant matrix causes a decrease in the conductivity of the proppant, mainly due to: the pressure resistance of the proppant is reduced due to the fact that the stress area is enlarged due to the overlarge particle size of the proppant, and when the proppant is subjected to pressure, more fine particles are generated to block a conveying channel, so that the flow conductivity of the proppant is reduced; and if the particle size of the propping agent is too small, the blocking of a conveying channel is directly caused, and the reduction of the flow guide capacity of the propping agent is reduced.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are intended to fall within the scope of the appended claims.

TABLE 1

Proppant samples	Acid solubility wt ‰	Turbidity NTU	Conductivity mum²·cm
				S1	0.2	5	148.4
S2	0.1	4	137.8
				S3	0.4	7	128.3
S4	0.8	10	126.0
				S5	0.5	7	152.5
S6	0.4	7	143.9
				S7	0.3	5	150.2
S8	0.2	4	147.8
				C1	4.7	56	125.3

Claims

1. A surface modified proppant comprises a substrate and a substrate coating layer, and is characterized in that: the matrix coating layer is formed by curing resin by a curing agent and is added with a high molecular surfactant, a lubricant and a hydrophobic polymer, wherein the weight ratio of the resin to the matrix is 2-10:100, the curing agent accounts for 10-20 wt% of the weight of the resin, the lubricant accounts for 2-5 wt% of the weight of the resin, the high molecular surfactant accounts for 0.2-1 wt% of the weight of the resin, and the hydrophobic polymer accounts for 0.2-2 wt% of the weight of the resin;

the hydrophobic units in the high molecular surfactant correspond to the hydrophobic groups in the hydrophobic high molecular;

the high molecular surfactant is one of polyether dimethyl siloxane, polyhydroxy vinyl methyl hydrogen siloxane, polyvinyl chloride ether, polyisobutylene ether, polyether methyl hydrogen siloxane and polyether siloxane, and the high molecular surfactant is closely connected with hydrophobic high molecules and resin.

2. The surface-modified proppant of claim 1, wherein: the hydrophobic polymer is one or more of polysiloxane, polysiloxane derivatives, polyolefin and halogenated polyolefin.

3. The proppant of claim 1, wherein: the average grain diameter of the matrix is 0.3-1.2 mm.

4. The surface-modified proppant of claim 1, wherein: the average grain diameter of the base body is 0.45-0.85 mm.

5. The surface-modified proppant of claim 1, wherein: the matrix coating layer also comprises a plasticizer, and the plasticizer accounts for 1-30 wt% of the weight of the resin.

6. The surface modified proppant of claim 5, wherein: the plasticizer is one or more of phthalate ester, aliphatic dibasic acid ester and phosphate ester, and accounts for 10-20 wt% of the resin.

7. The surface-modified proppant of claim 1, wherein: the resin is phenolic resin, and the corresponding curing agent is one or more of paraformaldehyde and hexamethylenetetramine; or

The resin is furan resin, and the corresponding curing agent is one or more of benzenesulfonic acid, toluenesulfonic acid and xylenesulfonic acid; or

The resin is epoxy resin, and the corresponding curing agent is one or more of aliphatic amine and addition product thereof, tertiary amine and salt thereof, aromatic amine and modified product thereof, and imidazole; or

The resin is unsaturated polyester resin, and the corresponding curing agent is one or more of peroxyacyl and peroxyester; or

The resin is vinyl resin, and the corresponding curing agent is one or more of peroxyacyl and peroxyester.

8. The surface-modified proppant of claim 1, wherein: the substrate is quartz sand and/or ceramsite sand, and the lubricant is one or more of polyethylene wax, oxidized polyethylene wax, stearic acid amide, ethylene bis-stearic acid amide, calcium stearate and zinc stearate.