Rock modifier for increasing migration distance of acid liquor as well as preparation method and application of rock modifier

Abstract

The invention discloses a rock modifier for increasing the migration distance of acid liquor as well as a preparation method and application of the rock modifier, and belongs to the technical field of rock modification. The rock modifier is prepared from the following raw materials in parts by mass: 2 to 10 parts of heptadecafluorooctyltriethoxysilane, 1 to 4 parts of tetraethoxysilane, 1 to 5 parts of perfluorooctane sulfonic acid, 1 to 4 parts of propargyl alcohol, 0.5 to 1.5 parts of inorganic salt, 45 to 55 parts of ethanol, 0.05 to 0.15 part of acid and 130 to 160 parts of water. The rock modifier is applied to oil and gas reservoir exploitation and is firmly adsorbed on the rock surface to form a layer of hydrophobic and oleophobic film, so that the migration distance of acid liquor is effectively increased, and the acidification operation efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of rock modification, and in particular relates to a rock modifier for increasing the migration distance of acid solution, and a preparation method and application thereof. Background Art

[0002] Acidizing is a widely used measure to increase the production of oil and gas layers to remove damage near the wellbore. It mainly involves squeezing acid prepared on the ground into the oil (gas) formation through the wellbore. When the acid flows, it reacts chemically with the formation wall it contacts. The acid dissolves the blockages in the bottom of the well and the formation nearby, and restores the inherent formation; the acid dissolves carbonate rocks and calcareous cements, increases the oil and gas seepage channels, reduces the oil and gas resistance, and achieves the purpose of increasing production and injection. When the acid concentration is reduced to a certain concentration (usually 10% of the fresh acid concentration), it is called residual acid or deficient acid. Existing research results show that temperature, pressure, rock type, surface area ratio, acid concentration, flow rate, common ion effect, etc. have a significant effect on the acid-rock reaction speed (effective migration distance). The speed of the acid-rock reaction determines the effective action distance of the acidizing working fluid; the faster the reaction speed, the shorter the effective action distance; it is currently urgent to develop relevant technologies to increase the effective migration distance of the acid and improve the acidizing efficiency. Summary of the invention

[0003] In view of the above-mentioned prior art, the present invention provides a rock modifier for increasing the migration distance of acid solution, and a preparation method and application thereof, thereby improving the effective migration distance of acid solution.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: to provide a rock modifier for increasing the migration distance of acid solution, the rock modifier comprises the following raw materials in parts by weight: 2 to 10 parts of heptadecafluorooctyltriethoxysilane, 1 to 4 parts of ethyl orthosilicate, 1 to 5 parts of perfluorooctanesulfonic acid, 1 to 4 parts of propynyl alcohol, 0.5 to 1.5 parts of inorganic salt, 45 to 55 parts of ethanol, 0.05 to 0.15 parts of acid and 130 to 160 parts of water.

[0005] The beneficial effects of the above technical solution adopted by the present invention are as follows: Common rock minerals in oil and gas fields include orthoclase, albite, kaolinite, montmorillonite, chlorite, phillipsite, muscovite and biotite, etc., and the main components are aluminosilicates. From the analysis of the crystal structure, although the rock mineral compositions are different, they are all composed of Si-O tetrahedron and Al-O octahedron basic structural units in a ratio of 1:1 or 2:1, and the two are connected by a common O atom, and the apexes of all Si-O tetrahedrons are facing the Al-O octahedron, that is, the rock surface is always a Si-O tetrahedron structure wafer. According to the principles of rock mineralogy and sedimentology, during the long-term sedimentation process, the oxygen atoms at the vertices of the Si-O tetrahedron of the rock are partially replaced by hydroxyl-OH. Using similar principles, the three Si-O groups in the Si-O tetrahedron structure of the rock modifier will react chemically with the hydroxyl-OH at the vertices of the three Si-O tetrahedrons on the rock surface to form a stable chemical bond. The schematic diagram of the reaction between the rock modifier and the rock surface is shown in Figure 1 As shown. That is, under the condition of high formation temperature, 17-fluorooctyl triethoxysilane is hydrolyzed to generate siloxane through the catalytic effect of acid, and then dehydrates with the hydroxyl-rich rock surface to form a stable O-Si-O chemical bond with the rock interface. On the other hand, the carbon fluorine chain of 17-fluorooctyl triethoxysilane has good hydrophobic and oleophobic properties; when the acid passes through the rock surface, the hydrophobic and oleophobic properties given to the rock surface by the rock modifier will effectively reduce the contact between the acid and the rock surface, allowing the acid to move forward quickly. In order to improve the bonding strength between 17-fluorooctyl triethoxysilane and the material, a certain amount of ethyl orthosilicate is added. Ethyl orthosilicate and 17-fluorooctyl triethoxysilane are hydrolyzed together, which can enhance the reaction between 17-fluorooctyl triethoxysilane and the hydroxyl groups on the rock surface, making the rock modifier more tightly bonded to the rock surface. Perfluorooctane sulfonic acid reduces the interfacial tension between the liquid and the contacted surface, making the rock modifier more firmly bonded to the rock surface. As a corrosion inhibitor, propargyl alcohol can react and combine with the abundant hydroxyl groups on the rock surface. The presence of inorganic salts can enhance the corrosion inhibition of propargyl alcohol. When the acid passes through the rock surface, it can effectively slow down the reaction between the acid and the rock, thereby reducing the speed at which the acid becomes depleted acid and increasing the migration distance of the acid. As a mutual solvent, ethanol allows the several raw materials of the rock modifier to effectively dissolve in each other and work together.

[0006] Based on the above technical solution, the present invention can also be improved as follows.

[0007] Further, the rock modifier includes the following raw materials in parts by mass: 6 parts of heptadecafluorooctyltriethoxysilane, 2 parts of ethyl orthosilicate, 3 parts of perfluorooctanesulfonic acid, 2 parts of propargyl alcohol, 0.1 parts of inorganic salt, 50 parts of ethanol, 0.08 parts of acid and 150 parts of water.

[0008] Furthermore, the inorganic salt is sodium chloride or potassium chloride, and the acid is sulfuric acid, hydrochloric acid or nitric acid.

[0009] Furthermore, the preparation method of the rock modifier comprises the following steps:

[0010] (1) Add inorganic salt, ethanol and acid to water in sequence and stir evenly;

[0011] (2) adding propargyl alcohol to the solution obtained in step (1) and stirring evenly;

[0012] (3) adding perfluorooctane sulfonic acid to the solution obtained in step (2) and stirring evenly;

[0013] (4) Add heptadecafluorooctyltriethoxysilane and ethyl orthosilicate to the solution obtained in step (3), and stir for 1.5 to 2 hours to obtain the product.

[0014] The beneficial effect of the further technical solution adopted in the present invention is: the rock modifier can be obtained by adopting the above raw materials and proportions and stirring and mixing at room temperature; the raw materials are easy to obtain and the preparation method is simple.

[0015] Further, the application of rock modifiers in oil and gas reservoir exploitation.

[0016] Furthermore, rock modifiers increase the distance that acid can travel during oil and gas acidizing operations.

[0017] Furthermore, the reaction time of the rock modifier is 0.5 to 2 h.

[0018] Furthermore, the reaction temperature of the rock modifier is 80-120°C.

[0019] The beneficial effect of the above-mentioned further technical scheme adopted by the present invention is: before the oil and gas acidizing operation, the rock modifier is introduced into the formation, and with the help of the higher temperature in the formation environment, the reaction is carried out for 0.5 to 2 hours. The rock modifier is firmly adsorbed on the rock surface to form a hydrophobic and oil-repellent film, which effectively increases the acid migration distance and improves the acidizing efficiency.

[0020] The beneficial effects of the present invention are as follows: the rock modifier used in the present invention to increase the migration distance of the acid solution has two basic units. Among them, the RO-Si group can react with the rock surface and is the reactive group of the rock modifier; the RO-Si group is hydrolyzed to form HO-Si, which reacts with the hydroxyl group (-OH) on the rock surface, sheds H2O molecules, and leaves the covalently bonded R`-Si group on the rock surface; the R`-Si group is the functional group of the rock modifier, which plays a role in rock modification. The rock modifier forms a thin film on the rock surface, making the rock have both hydrophobic and oleophobic properties.

[0021] The heptadecafluorooctyl triethoxysilane in the raw material of the rock modifier works together with ethyl orthosilicate, perfluorooctane sulfonic acid and acid, which not only enhances the bonding force between the film and the rock surface, but also promotes the uniformity and density of the film; the hydrolysis product of ethyl orthosilicate, silanol (Si-OH), can react with the hydroxyl groups on the rock surface and the ethoxy groups (-OCH2CH3) of fluorosilane to form a cross-linked siloxane network, and an appropriate amount of acid can accelerate the hydrolysis reaction rate of silane, promote the formation of silicon-oxygen bonds and the construction of the film; propargyl alcohol and inorganic salts can also help to form a uniform solution system, which is beneficial to subsequent reactions and the formation of the film, and increase the cross-linking density and stability of the film; the mixed solvent system of ethanol and water helps to adjust the polarity and solubility of the reaction system, so that the components can better interact and react with each other. The components in the formula work synergistically through chemical reactions and physical actions. By precisely controlling the proportion of each component and the reaction conditions, a hydrophobic and oleophobic rock surface with excellent performance can be obtained.

[0022] After testing, it was found that the rock modifier has excellent improvement in rock wettability, with a water phase wetting contact angle of over 150° and an oil phase wetting contact angle of about 120°. It also has super hydrophobicity and good oleophobicity. The rock modifier is combined with the rock through a stable covalent bond, is resistant to high temperature and erosion, and can maintain the wettability improvement effect for a long time; therefore, the rock modifier is firmly adsorbed on the rock surface to form a hydrophobic and oleophobic film, which effectively increases the acid migration distance and improves the acidizing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Schematic diagram of the reaction between rock modifier and rock surface. DETAILED DESCRIPTION

[0024] The specific implementation modes of the present invention are described in detail below with reference to the embodiments.

[0025] Example 1

[0026] A rock modifier for increasing the migration distance of acid solution, comprising the following raw materials in parts by weight: 6 parts of heptadecafluorooctyl triethoxysilane, 2 parts of ethyl orthosilicate, 3 parts of perfluorooctane sulfonic acid, 2 parts of propargyl alcohol, 0.1 parts of sodium chloride, 50 parts of ethanol, 0.08 parts of nitric acid and 150 parts of water; the specific preparation method is as follows:

[0027] (1) Using a constant temperature digital display stirrer with a speed set to 600 r / min, add inorganic salt, ethanol and acid to deionized water in sequence and stir evenly;

[0028] (2) adding propargyl alcohol to the solution obtained in step (1) and stirring at 600 r / min for 30 min;

[0029] (3) adding perfluorooctane sulfonic acid to the solution obtained in step (2), and stirring at 600 r / min for 30 min;

[0030] (4) Add heptadecafluorooctyltriethoxysilane and ethyl orthosilicate to the solution obtained in step (3), and stir at a speed of 600 r / min for 1.5 h; thereby obtaining the product.

[0031] Example 2

[0032] A rock modifier for increasing the migration distance of acid solution, comprising the following raw materials in parts by weight: 2 parts of heptadecafluorooctyl triethoxysilane, 1 part of ethyl orthosilicate, 1 part of perfluorooctanesulfonic acid, 4 parts of propargyl alcohol, 0.5 parts of sodium chloride, 55 parts of ethanol, 0.15 parts of sulfuric acid and 130 parts of water; the specific preparation method is as follows:

[0033] (1) Using a constant temperature digital display stirrer with a speed set to 600 r / min, add inorganic salt, ethanol and acid to deionized water in sequence and stir evenly;

[0034] (2) adding propargyl alcohol to the solution obtained in step (1) and stirring at 600 r / min for 30 min;

[0035] (3) adding perfluorooctane sulfonic acid to the solution obtained in step (2), and stirring at 600 r / min for 30 min;

[0036] (4) adding heptadecafluorooctyltriethoxysilane and ethyl orthosilicate to the solution obtained in step (3), and stirring at a speed of 600 r / min for 2 h; thus obtaining the product.

[0037] Example 3

[0038] A rock modifier for increasing the migration distance of acid solution comprises the following raw materials in parts by weight: 10 parts of heptadecafluorooctyltriethoxysilane, 4 parts of ethyl orthosilicate, 5 parts of perfluorooctanesulfonic acid, 1 part of propynyl alcohol, 1.5 parts of potassium chloride, 45 parts of ethanol, 0.05 parts of hydrochloric acid and 160 parts of water; the specific preparation method is the same as that in Example 1.

[0039] Comparative Example 1

[0040] A rock modifier comprises the following raw materials in parts by weight: 6 parts of heptadecafluorooctyltriethoxysilane, 2 parts of ethyl orthosilicate, 3 parts of perfluorooctanesulfonic acid, 50 parts of ethanol, 0.08 parts of nitric acid and 150 parts of water; the specific preparation method is the same as that in Example 1.

[0041] Comparative Example 2

[0042] A rock modifier comprises the following raw materials in parts by weight: 6 parts of heptadecafluorooctyltriethoxysilane, 2 parts of ethyl orthosilicate, 2 parts of propargyl alcohol, 0.1 parts of sodium chloride, 50 parts of ethanol, 0.08 parts of nitric acid and 150 parts of water; the specific preparation method is the same as that in Example 1.

[0043] Comparative Example 3

[0044] A rock modifier comprises the following raw materials in parts by weight: 6 parts of heptadecafluorooctyltriethoxysilane, 3 parts of perfluorooctanesulfonic acid, 2 parts of propargyl alcohol, 0.1 parts of sodium chloride, 50 parts of ethanol, 0.08 parts of nitric acid and 150 parts of water; the specific preparation method is the same as that in Example 1.

[0045] Comparative Example 4

[0046] A rock modifier comprises the following raw materials in parts by weight: 6 parts of heptadecafluorooctyltriethoxysilane, 0.3 parts of ethyl orthosilicate, 3 parts of perfluorooctanesulfonic acid, 2 parts of propynyl alcohol, 0.1 parts of sodium chloride, 50 parts of ethanol, 0.08 parts of nitric acid and 150 parts of water; the specific preparation method is the same as that in Example 1.

[0047] Experimental example

[0048] The performance of the rock modifiers for increasing the migration distance of the acid solution obtained in Examples 1 to 3 is similar. Taking Example 1 as an example, the performance of the rock modifier is described in detail.

[0049] 1. Dissolution and compounding experiment

[0050] The rock modifiers prepared in Example 1 and Comparative Examples 1 to 4 were placed in an oven at 80° C. (simulating formation temperature conditions) for 2 h, and the dispersion of the solutions was observed.

[0051] After standing, Example 1 and Comparative Example 1 remain colorless and transparent, indicating that the rock modifier has good dispersibility; white precipitates appear at the bottom of Comparative Examples 2 and 3, and even after shaking, the white precipitates cannot be effectively dispersed into the solution; stratification occurs in Comparative Example 4, indicating that the raw material of the rock modifier cannot be effectively dispersed in the system. From the experimental results of Example 1 and Comparative Examples 1 to 4, it can be seen that ethyl orthosilicate and perfluorooctane sulfonic acid play an important role in the dispersion of the entire rock modifier system.

[0052] 2. Particle size analysis experiment

[0053] The measurement principle of the particle size analyzer is based on the scattered light signal of particles in the liquid to estimate the particle size. The specific experimental steps are as follows:

[0054] (1) Using anhydrous ethanol as solvent, prepare a uniform suspension with a rock modifier concentration of 1 / 1000 and 1 / 10000, and fully shake it before testing to prevent sedimentation;

[0055] (2) Turn on the particle size analyzer and preheat the instrument for 30 minutes;

[0056] (3) Slowly add the prepared solution into the glass dish to avoid generating bubbles. The solution should occupy about 2 / 3 of the volume of the glass dish.

[0057] (4) Set the software test parameters and start the instrument for measurement.

[0058] Particle size analysis of the rock modifier prepared in Example 1 found that its effective particle size was 241.92 nm, and its particle size distribution range was between 170 and 280 nm, among which the particle size distribution of 230 to 255 nm was the widest, with a relative frequency of 58.91%, indicating that the average particle size of the rock modifier is relatively small, the particle size distribution range is relatively concentrated, and the dispersion effect in the solution is good.

[0059] 3. Effect of rock modifiers on rock surface wettability

[0060] The wetting contact angle experiment is used to test the wetting contact angle of the rock surface treated with the rock modifier. The specific experimental steps are as follows:

[0061] The experimental materials are mainly natural cores with a diameter of 5 to 10 cm and a diameter of 2.5 cm drilled on site in Changqing Oilfield; the main instruments used are the wetting contact angle meter (model JC2000D3R) produced by Shanghai Zhongchen Digital Technology Equipment Co., Ltd. and the rotary vane vacuum pump (model 2XZ-2) produced by Shanghai Lichen Bangxi Instrument Technology Co., Ltd.

[0062] (1) The natural core was cleaned and dried, and cut into rock samples with a thickness of about 0.4 cm using a core cutter;

[0063] (2) Immerse the rock sample in the rock modifier and place it in an oven at 80°C for 1 h;

[0064] (3) After the rock sample has cooled, it is placed on the stage of the contact angle meter for wetting contact angle measurement.

[0065] The test results of the wetting contact angle of the rock surface are shown in Table 1.

[0066] Table 1 Wetting contact angle of rock surface

[0067] Water phase wetting contact angle Oil phase wetting contact angle Example 1 162° 123° Comparative Example 1 158° 121° Comparative Example 2 129° 98° Comparative Example 3 113° 105° Comparative Example 4 96° 82°

[0068] 4. Infrared absorption spectrum (FT-IR) analysis

[0069] By analyzing the absorption peak position, absorption peak intensity and peak shape in the infrared absorption spectrum, specific functional groups that may exist in the compound can be identified; the specific experimental steps are as follows:

[0070] (1) Drying the rock samples treated with the rock modifier and the rock samples not treated with the rock modifier for later use;

[0071] (2) Grind potassium bromide granules into a fine powder in an agate mortar;

[0072] (3) Take a small amount of potassium bromide powder and spread it flat in an infrared tableting mold, press it with a powder tablet press at 10 MPa for 30 seconds, remove the pressure, and put it into an infrared spectrometer;

[0073] (4) Open the test software, adjust the test parameters, and measure the baseline curve with potassium bromide as the background;

[0074] (5) Take out the tested thin-section sample, mix the rock powder and potassium bromide powder in a ratio of 1:10 to prepare a new thin-section sample, and obtain a set of experimental data after tableting.

[0075] Infrared data of the surface of the rock sample without rock modifier treatment showed that at 692 cm -1 There is a significant absorption peak at 1095cm, which corresponds to the Si-OH functional group of the rock sample and reflects the chemical properties of the rock sample itself. The infrared data of the rock sample treated with the rock modifier prepared in Example 1 has newly generated obvious characteristic peaks, which are closely related to the new chemical bonds introduced by the rock modifier; among them, 1095cm -1 The Si-O-Si bond vibration characteristic peaks showed that the rock modifier had chemical bonding with the silanol in the rock sample; 1149cm -1 and 1205cm -1 A strong CF absorption peak was observed, verifying that the rock modification group had been successfully connected to the rock sample. This indicates that after being treated with the rock modifier, the Si-OH absorption peak on the surface of the rock sample disappeared, and new obvious Si-O-Si and CF absorption peaks appeared, indicating that the rock modifier reacted chemically with the -OH group on the surface of the rock sample, the original -OH group was consumed, and a new Si-O-Si chemical bond was formed.

[0076] Application Example 1: Effect of reaction time on the wettability of rock surface

[0077] The reaction time between the rock modifier prepared in Example 1 and the rock sample was adjusted to 10 min, 0.5 h, 1 h, 2 h and 3 h, and the wetting contact angles were measured after the reaction, as shown in Table 2.

[0078] Table 2 Wetting contact angles of rock samples after different reaction times

[0079] 10min 0.5h 1h 2h 3h Water phase wetting contact angle 77° 134° 162° 159° 165° Oil phase wetting contact angle 98° 118° 123° 134° 129°

[0080] Application Example 2: Effect of Temperature on Rock Surface Wettability

[0081] The reaction temperatures of the rock modifier prepared in Example 1 and the rock sample were adjusted to 25°C, 50°C, 80°C and 120°C, where 80°C was the simulated formation temperature condition. After the reaction, the wetting contact angles were measured respectively, as shown in Table 3.

[0082] Table 3 Wetting contact angles of rock samples at different reaction temperatures

[0083] 25℃ 50℃ 80℃ 120℃ Water phase wetting contact angle 121° 115° 162° 162° Oil phase wetting contact angle 95° 113° 123° 125°

[0084] Application Example 3: Acid-Rock Reaction Rate

[0085] The rock samples were modified with rock modifiers, and the acid-rock reaction rates before and after modification were tested. The results are shown in Table 4.

[0086] Table 4 Acid-rock reaction rate before and after rock modifier modification

[0087]

[0088] The change in the acid-rock reaction rate shows that the rock modifier prepared in Example 1 can effectively combine with the rock surface and significantly reduce the acid-rock reaction rate. Its effect of reducing the acid-rock reaction rate is significantly better than the rock modifiers prepared in Comparative Examples 1 to 4.

[0089] Application example 4: Anti-scour test

[0090] After the rock sample was modified with the rock modifier prepared in Example 1, the initial wetting contact angle value was measured. The rock sample was placed in a rock sample holder and flushed with liquid velocities of 0.005 m / d, 0.01 m / d, 0.05 m / d, 0.10 m / d, 0.50 m / d, 1.0 m / d, 1.5 m / d, 2.0 m / d and 4.0 m / d, respectively, for a flushing time of 14 days. After the flushing was completed, the rock sample was taken out and dried, and the wetting contact angle was measured multiple times at different positions, and the average value was calculated to explore the stability performance of the low permeability core after continuous fluid flushing and the change law of wettability.

[0091] After continuous flushing with liquids at different flow rates for 14 days, the wetting contact angle of each group of samples decreased to varying degrees. The water phase wetting contact angle of the rock sample before flushing after surface modification was between 155° and 163°. The change in the wetting contact angle of the rock sample after flushing with liquid at no flow rate did not exceed 12°. The final water phase wetting contact angle ranged from 143° to 153°, showing good hydrophobic properties. This shows that the rock modifier has a strong bonding force with the rock surface and will not be easily peeled off due to external force.

[0092] Application Example 5: Long-term Aging Experiment

[0093] After the rock samples were treated with the rock modifier prepared in Example 1, they were placed in an 80°C environment, and the aging time was 0d, 30d, 60d, 90d, 120d, 150d and 180d, and the contact angle changes of the rock samples were tested at different time points. As the aging time increased, the contact angle showed a slow downward trend and finally stabilized. The final wetting contact angle after aging did not exceed 18°, and the final water phase wetting contact angle ranged from 137° to 150°. The results show that the rock modifier can exhibit excellent anti-aging ability.

[0094] Therefore, in practical applications, this rock modifier can be used to improve the formation while maintaining its good hydrophobic properties. Since the rock modifier can form a stable covalent bond with the rock surface, it can maintain its performance in a high temperature environment for a long time, further enhancing its feasibility and reliability in field applications.

[0095] Although the specific implementation of the present invention is described in detail in conjunction with the embodiments, it should not be understood as limiting the scope of protection of this patent. Within the scope described in the claims, various modifications and variations that can be made by those skilled in the art without creative work still fall within the scope of protection of this patent.

Claims

1. A rock modifier for increasing the migration distance of acid solution, characterized in that: The rock modifier comprises the following raw materials in parts by weight: 2 to 10 parts of heptadecafluorooctyltriethoxysilane, 1 to 4 parts of ethyl orthosilicate, 1 to 5 parts of perfluorooctanesulfonic acid, 1 to 4 parts of propynyl alcohol, 0.5 to 1.5 parts of inorganic salt, 45 to 55 parts of ethanol, 0.05 to 0.15 parts of acid and 130 to 160 parts of water.

2. The rock modifier for increasing the migration distance of acid solution according to claim 1, characterized in that: The rock modifier comprises the following raw materials in parts by mass: 6 parts of heptadecafluorooctyltriethoxysilane, 2 parts of ethyl orthosilicate, 3 parts of perfluorooctanesulfonic acid, 2 parts of propargyl alcohol, 0.1 parts of inorganic salt, 50 parts of ethanol, 0.08 parts of acid and 150 parts of water.

3. The rock modifier for increasing the migration distance of acid solution according to claim 1 or 2, characterized in that: The inorganic salt is sodium chloride or potassium chloride, and the acid is sulfuric acid, hydrochloric acid or nitric acid.

4. The method for preparing the rock modifier for increasing the migration distance of acid solution according to any one of claims 1 to 3, characterized in that: The following steps are involved: (1) Add inorganic salt, ethanol and acid to water in sequence and stir evenly; (2) adding propargyl alcohol to the solution obtained in step (1) and stirring evenly; (3) adding perfluorooctane sulfonic acid to the solution obtained in step (2) and stirring evenly; (4) Add heptadecafluorooctyltriethoxysilane and ethyl orthosilicate to the solution obtained in step (3), and stir for 1.5 to 2 hours to obtain the product.

5. Use of the rock modifier for increasing the migration distance of acid solution as claimed in any one of claims 1 to 3 in the exploitation of oil and gas reservoirs.

6. The use according to claim 5, characterized in that: The rock modifier increases the acid migration distance in oil and gas acidizing operations.

7. The use according to claim 5, characterized in that: The reaction time of the rock modifier is 0.5 to 2 hours.

8. The use according to claim 5, characterized in that: The reaction temperature of the rock modifier is 80-120°C.

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