An organic swelling inhibitor composition and its preparation and application

Abstract

The present invention provides an organic anti-swelling agent composition, based on the total mass of the composition, comprising: (1) a bisquaternary ammonium salt with a hydroxyl group-containing head group, 10% - 40%, preferably 20% - 30%; (2) an esterified modified sophorolipid, 5% - 25%, preferably 10% - 20%; (3) an inorganic salt, 0 - 15%, preferably 1 - 10%; (4) the balance is mainly water. The organic anti-swelling agent composition of the present invention can effectively inhibit the swelling, dispersion and migration of clay minerals, and in addition, also has functions such as reducing interfacial tension, washing oil, wetting, etc., and is suitable for application in the field of pressure reduction and injection increase in low-permeability oil reservoirs or tight oil reservoirs.

Description

Technical Field

[0001] The present invention relates to an organic anti-swelling agent composition for oil and gas production, which can inhibit the swelling and migration of clay minerals and protect the normal development of oil and gas reservoirs. Background Art

[0002] Clay minerals are widely present in oil reservoir formations, and more than 95% of the oil layers globally contain clay minerals to varying degrees. During drilling, water injection, and oil production processes, clay hydration swelling is likely to occur. The hydration swelling, dispersion, and migration of clay will reduce the permeability of the reservoir, block the reservoir channels, cause damage to the oil and gas layers, decrease the production of oil and gas wells, and even make subsequent exploitation impossible. Anti-swelling agents play a very important role in stabilizing clay minerals and achieving stable and high-yield production in oil and gas fields.

[0003] Currently, the commonly used anti-swelling agents in oil fields mainly include inorganic salts and organic cations. Inorganic salts have good anti-swelling effects but poor erosion resistance; when macromolecular cationic polymers are used as anti-swelling agents, they are likely to block pores and reduce the permeability of low-permeability oil reservoirs; low-polymerization or small-molecule organic anti-swelling agents have been a research hotspot in recent years.

[0004] Patent CN 108467718 B provides a clay anti-swelling agent for water injection with anti-corrosion effects, which consists of a cationic surfactant, an anti-corrosion and corrosion inhibitor, dodecyl dimethyl benzyl ammonium chloride, diammonium hydrogen phosphate, ammonium chloride, and potassium chloride. It can prevent clay swelling and the migration of clay particles. However, the conventional surfactants used have a large adsorption amount in the formation, are prone to multi-layer adsorption, reducing their effective concentration, and lack functions such as reducing the interfacial tension and solubilizing residual oil.

[0005] Patent CN 108977190 B provides a small-molecule liquid anti-swelling agent, a clay anti-swelling agent for fracturing, and a preparation method. The anti-swelling agent includes the following components by weight percentage: 10 - 65% of alkyl hydroxypropyl quaternary ammonium salt, 1 - 10% of guanidine hydrochloride, 1 - 10% of non-ionic surfactant, and the balance is water. The non-ionic surfactant is an alkylphenol polyoxyethylene ether or a fatty alcohol polyoxyethylene ether with 8 - 18 carbon atoms in the hydrocarbon group and a polymerization degree of 8 - 20. This liquid anti-swelling agent consists of small-molecule components, has a low relative molecular weight, does not damage the oil and gas layers, and is convenient for on-site preparation. However, the non-ionic surfactant used in this invention has a cloud point, poor temperature resistance, and is generally mainly used for oil reservoirs with a formation temperature below 70°C. Moreover, this non-ionic surfactant easily emulsifies crude oil, generates the Jamin effect in the tiny pores of low-permeability oil reservoirs, increases the injection pressure of injection wells, easily leads to difficult water injection, fails to replenish the formation energy in a timely manner, and reduces the oil production of oil wells.

[0006] For the purpose of reservoir protection, it is necessary to develop an organic anti-swelling agent with the functions of reducing interfacial tension, wetting, and oil washing, inhibiting the dispersion and migration of clay minerals, and ensuring the stable and high-yield production of oil and gas reservoirs. Summary of the Invention

[0007] The object of the present invention is to provide an organic anti-swelling agent composition, which can effectively inhibit the swelling, dispersion, and migration of clay minerals, and also has the functions of reducing interfacial tension, oil washing, wetting, etc.

[0008] In order to achieve the above object, a first aspect of the present invention provides an organic anti-swelling agent composition, which contains the following components stored independently or in combination of two or more. Based on the total mass of the composition, it includes:

[0009] (1) Bisquaternary ammonium salt with a hydroxyl-containing head group, 10%-40%, preferably 20%-30%;

[0010] (2) Esterified modified sophorolipid, 5%-25%, preferably 10%-20%;

[0011] (3) Inorganic salt, 0-15%, preferably 1-10%;

[0012] (4) The balance is mainly water.

[0013] According to the composition of the present invention, for the bisquaternary ammonium salt with a hydroxyl-containing head group, the molecular structure of its main component is shown in Formula 1:

[0014]

[0015] In Formula 1, the group R is C 4-24 alkyl, preferably C 8-20 alkyl, more preferably C 12-16 n-alkyl; n is an integer from 2 to 16, preferably an integer from 2 to 12, more preferably an integer from 4 to 8; X is Cl or Br.

[0016] The preparation method of the bisquaternary ammonium salt with a hydroxyl-containing head group includes:

[0017] (1) Mix the haloalkane, diethanolamine, and solvent, react at the reflux temperature, and remove the solvent to obtain an intermediate product;

[0018] (2) Mix the intermediate product with the dihalide and solvent, stir and react at the reflux temperature, and after removing the solvent, obtain a white solid, which is the bisquaternary ammonium salt with a hydroxyl-containing head group.

[0019] Specifically, it can be prepared according to the following method:

[0020] (1) Weigh a certain amount of haloalkane, diethanolamine and solvent in proportion, add them to the reaction device, and stir and react for a certain period of time at the reflux temperature. Remove the solvent by vacuum distillation, then extract with ether to obtain the crude product, and recrystallize with acetone to obtain a white solid. Wash with hot sodium hydroxide solution (mass fraction about 5%) and water to obtain the intermediate product.

[0021] (2) Take a certain amount of the intermediate product, add dibromoalkane and solvent, stir and react for a certain period of time at the reflux temperature, and recrystallize the product with a mixed solvent of ethanol and ethyl acetate to obtain a white solid, which is the bisquaternary ammonium salt with a hydroxyl group-containing head group.

[0022] In step (1), the molar ratio of diethanolamine to haloalkane is 1:1 to 1.5, preferably 1:1.05 to 1.25.

[0023] In step (1), the haloalkane is selected from one of bromo- or chloro-C 4-24 alkanes, preferably bromo- or chloro-C 8-20 alkanes, more preferably 1-bromododecane, 1-bromotetradecane, 1-bromohexadecane.

[0024] In step (1), the solvent is selected from one or a mixture of two of ethanol, n-propanol, and isopropanol, preferably n-propanol.

[0025] In step (1), the reaction time is 4 to 48 hours, preferably 12 to 24 hours.

[0026] In step (2), the molar ratio of dibromoalkane to the intermediate product is 1:2 to 2.3, preferably 1:2.1 to 2.2.

[0027] In step (2), the dibromoalkane is selected from bromo- or chloro-C 2-16 alkanes, preferably bromo- or chloro-C 2-12 alkanes, such as 1,2-dibromoethane, 1,3-dibromopropane, 1,4-dibromobutane, 1,6-dibromohexane, 1,8-dibromooctane, 1,10-dibromodecane, 1,12-dibromododecane, 1,2-dichloroethane, 1,3-dichloropropane, 1,4-dichlorobutane, 1,6-dichlorohexane, 1,8-dichlorooctane, 1,10-dichlorodecane, 1,12-dichlorododecane, more preferably C 4-8 alkanes, such as 1,4-dibromobutane, 1,6-dibromohexane, 1,8-dibromooctane, 1,4-dichlorobutane, 1,6-dichlorohexane, 1,8-dichlorooctane.

[0028] In step (2), the solvent is selected from one of ethanol, n-propanol, isopropanol, and acetonitrile, preferably n-propanol.

[0029] In step (2), the reaction time is 12 to 72 hours, preferably 30 to 60 hours.

[0030] For the composition according to the present invention, the molecular structure of the main component of the esterified modified sophorolipid is shown in Formula 2:

[0031]

[0032] In Formula 2, the group R is C 1-4 alkyl.

[0033] The esterified modified sophorolipid can be prepared by the following method:

[0034] (1) Weigh a certain amount of lactone-type sophorolipid and a monohydric alcohol in proportion and add them to the reaction device. Then weigh a certain amount of amphiphilic organic acid catalyst and add it to the reaction device, and stir and heat up to the reaction temperature for reaction;

[0035] (2) After reacting for a period of time, stop heating. Wait for the system to cool to room temperature, and add an appropriate amount of base under stirring conditions to adjust the system to neutrality to obtain the esterified modified sophorolipid product.

[0036] Among them, the organic acid catalyst is selected from one or more of straight-chain or branched-chain alkyl sulfonic acids with C 8 ~C 16 , straight-chain or branched-chain alkyl benzene sulfonic acids with C 8 ~C 16 , and straight-chain or branched-chain alkyl naphthalene sulfonic acids with C 8 ~C 16 , preferably straight-chain or branched-chain alkyl benzene sulfonic acids with C 8 ~C 16 .

[0037] For the composition according to the present invention, the inorganic salts are selected from one or a mixture of several of chlorides, phosphates, potassium chloride, sodium chloride, ammonium chloride, magnesium chloride, calcium chloride, ammonium phosphate, and ammonium chloride of potassium, sodium, ammonium, magnesium, and calcium.

[0038] The second aspect of the present invention provides a preparation method of an organic swelling inhibitor composition, which includes: uniformly stirring a certain amount of bisquaternary ammonium salt with a hydroxyl-containing head group, esterified modified sophorolipid, necessary inorganic salts, and water to prepare the organic swelling inhibitor composition.

[0039] Preferably, the mixing conditions at least satisfy: the temperature is 10-40°C, and the stirring time is 20-60 min.

[0040] The third aspect of the present invention provides the application of the aforementioned organic swelling inhibitor composition in low-permeability reservoirs or tight reservoirs.

[0041] The application method includes: preparing the swelling inhibitor composition into a solution with a mass fraction of 0.3% to 20%, and injecting it into the formation from an injection well or an oil well.

[0042] The anti-swelling agent of the present invention can reduce the oil-water interfacial tension, improve the wettability of the formation, solubilize residual oil, and reduce the starting pressure.

[0043] The inventors of the present application found that the bisquaternary ammonium salt with a hydroxyl group in the head group can ionize cations during use to neutralize the electronegativity on the clay surface and compress the electric double layer. It can also form a firm adsorption with clay particles through electrostatic adsorption, forming an adsorption film on the clay surface to prevent the hydration swelling, dispersion and migration of clay particles.

[0044] The molecular structure of the esterified modified sophorolipid contains polar hydrophilic groups such as ester groups and multiple hydroxyl groups, and can be adsorbed on the surface of clay particles through van der Waals forces and hydrogen bonding. Its long-chain structure can effectively bind clay particles and produce good synergistic effects with the bisquaternary ammonium salt with a hydroxyl group in the head group.

[0045] The inorganic salt anti-swelling agent can compress the thickness of the diffuse electric double layer on the clay surface and reduce the Zeta potential on the clay surface. The negative charge carried by the clay mineral can be neutralized by the cations dissociated from the inorganic salt in water, the repulsive force between the negative charges between the crystal layer structures decreases, and water molecules are not easily invaded, thus inhibiting the hydration swelling.

[0046] The present invention combines the esterified modified sophorolipid, the bisquaternary ammonium salt with a hydroxyl group in the head group and the inorganic salt, which can weaken the electrostatic repulsion between the charges in the hydrophilic groups of the bisquaternary ammonium salt. Under the molecular synergistic action, it can adsorb on the surface of clay minerals at multiple points, and further improve the anti-swelling performance of the anti-swelling agent through bridging action, improve the erosion resistance of the anti-swelling agent, and is suitable for application in the field of pressure reduction and injection increase in low-permeability oil reservoirs or tight oil reservoirs. Specific embodiments

[0047] To make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be described in detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0048] In the following examples, the content of the lactone-type sophorolipid is 50%, and it is purchased from Shandong Qilu Biotechnology Group Co., Ltd.

[0049] In the following examples, unless otherwise specified, the reagents used are all commercially available chemical reagents, and there is no special limitation on this.

[0050] Preparation Example 1

[0051] Preparation of bisquaternary ammonium salt with hydroxyl group-containing head group: Weigh 27.42 g of dodecyl bromide (0.11 mol), 10.51 g of diethanolamine (0.10 mol) and n-propanol (100 mL) into a reaction flask, and stir and react at 80 °C for 12 hours. The solvent n-propanol is removed by vacuum distillation, and then the crude product is extracted with ether and recrystallized with acetone to obtain a white solid. It is washed once with a hot sodium hydroxide solution (mass fraction of 5%) and water respectively to obtain the intermediate product ZSJ. Take 35.80 g of the intermediate product ZSJ (0.086 mol) and place it in a reaction flask, add 8.64 g of 1,4-dibromobutane (0.04 mol), then add n-propanol (80 mL), and react at 100 °C for 48 hours. The n-propanol is removed by vacuum distillation, and it is recrystallized with ethanol and ethyl acetate to obtain the bisquaternary ammonium salt QSJ-1 with hydroxyl group-containing head group.

[0052] Preparation Example 2

[0053] Preparation of bisquaternary ammonium salt with hydroxyl group-containing head group: Weigh 33.59 g of hexadecyl bromide (0.11 mol), 10.51 g of diethanolamine (0.10 mol) and n-propanol (100 mL) into a reaction flask, and stir and react at 80 °C for 12 hours. The solvent n-propanol is removed by vacuum distillation, and then the crude product is extracted with ether and recrystallized with acetone to obtain a white solid. It is washed once with a hot sodium hydroxide solution (mass fraction of 5%) and water respectively to obtain the intermediate product ZSJ. Take 35.80 g of the intermediate product ZSJ (0.086 mol) and place it in a reaction flask, add 9.76 g of 1,4-dibromohexane (0.04 mol), then add n-propanol (80 mL), and react at 100 °C for 48 hours. The n-propanol is removed by vacuum distillation, and it is recrystallized with ethanol and ethyl acetate to obtain the bisquaternary ammonium salt QSJ-2 with hydroxyl group-containing head group.

[0054] Preparation Example 3

[0055] Preparation of methyl esterified modified sophorolipid SL-Me:

[0056] Weigh 60 g of lactone-type sophorolipid into a reaction flask, and successively add 16 g of methanol and 10 g of dodecylbenzenesulfonic acid, and react at 65 °C for 4 hours. After the reaction is completed, the pH of the system is adjusted to neutral with an aqueous NaOH solution, and the methyl esterified modified sophorolipid system can be obtained. Without purification, it can be used for performance evaluation.

[0057] "Each portion" in the following examples represents 0.5 g.

[0058] Example 1

[0059] Preparation of organic anti-swelling agent composition FPJ-1:

[0060] At 20°C, 30 parts of bisquaternary ammonium salt QSJ-1 were added to a reaction flask, then 20 parts of methyl esterified modified sophorolipid SL-Me were added, and finally 50 parts of water were added. After stirring for 30 min, an organic swelling inhibitor composition, designated FPJ-1, was prepared.

[0061] Example 2

[0062] Preparation of organic swelling inhibitor composition FPJ-2:

[0063] At 20°C, 20 parts of bisquaternary ammonium salt QSJ-1 were added to a reaction flask, then 10 parts of methyl esterified modified sophorolipid SL-Me were added, and finally 70 parts of water were added. After stirring for 30 min, an organic swelling inhibitor composition, designated FPJ-2, was prepared.

[0064] Example 3

[0065] Preparation of organic swelling inhibitor composition FPJ-3:

[0066] At 15°C, 25 parts of bisquaternary ammonium salt QSJ-1 were added to a reaction flask, then 15 parts of methyl esterified modified sophorolipid SL-Me were added, and finally 60 parts of water were added. After stirring for 40 min, an organic swelling inhibitor composition, designated FPJ-3, was prepared.

[0067] Example 4

[0068] Preparation of organic swelling inhibitor composition FPJ-4:

[0069] At 15°C, 25 parts of bisquaternary ammonium salt QSJ-1 were added to a reaction flask, then 15 parts of methyl esterified modified sophorolipid SL-Me were added, then 3 parts of potassium chloride were added, and finally 57 parts of water were added. After stirring for 40 min, an organic swelling inhibitor composition, designated FPJ-4, was prepared.

[0070] Example 5

[0071] Preparation of organic swelling inhibitor composition FPJ-5:

[0072] At 15°C, 25 parts of bisquaternary ammonium salt QSJ-1 were added to a reaction flask, then 15 parts of methyl esterified modified sophorolipid SL-Me were added, then 6 parts of sodium chloride were added, and finally 54 parts of water were added. After stirring for 40 min, an organic swelling inhibitor composition, designated FPJ-5, was prepared.

[0073] Example 6

[0074] Preparation of organic swelling inhibitor composition FPJ-6:

[0075] At 15°C, 25 parts of the bisquaternary ammonium salt QSJ-2 were added to a reaction flask, then 15 parts of the methyl esterified modified sophorolipid SL-Me were added, and finally 60 parts of water were added. After stirring for 40 min, an organic swelling inhibitor composition, numbered FPJ-6, was prepared.

[0076] Example 7

[0077] Preparation of the organic swelling inhibitor composition FPJ-7:

[0078] At 15°C, 25 parts of the bisquaternary ammonium salt QSJ-2 were added to a reaction flask, then 15 parts of the methyl esterified modified sophorolipid SL-Me were added, then 3 parts of potassium chloride were added, and finally 57 parts of water were added. After stirring for 40 min, an organic swelling inhibitor composition, numbered FPJ-7, was prepared.

[0079] Example 8

[0080] Preparation of the organic swelling inhibitor composition FPJ-8:

[0081] At 15°C, 25 parts of the bisquaternary ammonium salt QSJ-2 were added to a reaction flask, then 15 parts of the methyl esterified modified sophorolipid SL-Me were added, then 6 parts of sodium chloride were added, and finally 54 parts of water were added. After stirring for 40 min, an organic swelling inhibitor composition, numbered FPJ-8, was prepared.

[0082] Comparative Example 1

[0083] At 15°C, 40 parts of the bisquaternary ammonium salt QSJ-1 were added to a reaction flask, and then 60 parts of water were added. After stirring for 20 min, an organic swelling inhibitor, numbered DB-1, was prepared.

[0084] Comparative Example 2

[0085] At 15°C, 40 parts of the bisquaternary ammonium salt QSJ-2 were added to a reaction flask, and then 60 parts of water were added. After stirring for 20 min, an organic swelling inhibitor, numbered DB-1, was prepared.

[0086] Comparative Example 3

[0087] At 15°C, 40 parts of dodecyltrimethylammonium bromide were added to a reaction flask, and then 60 parts of water were added. After stirring for 20 min, an organic swelling inhibitor, numbered DB-3, was prepared.

[0088] Test Example 7

[0089] Measurement of interfacial tension: Using a TX-500C interfacial tensiometer, the oil-water interfacial tension value between crude oil and the swelling inhibitor solution was measured by the spinning drop method. The test temperature was 50 °C, the rotation speed was 6000 r / min, the oil phase used was the crude oil from a certain block in Shengli Oilfield, and the viscosity of the crude oil at 50 °C was 5.2 mPa·s. The concentration of all experimental samples was 3000 mg / L, and they were all prepared with formation water with a salinity of 78300 mg / L. The interfacial tension test results are shown in Table 1.

[0090] Table 1 Interfacial tension of the swelling inhibitor composition (50 °C)

[0091]

[0092]

[0093] As can be seen from Table 1, the swelling inhibitor composition provided by the present invention can significantly reduce the oil-water interfacial tension and improve the oil phase seepage capacity.

[0094] Test Example 8

[0095] Measurement of wetting reversal ability: The swelling inhibitor composition was prepared into an experimental sample with a concentration of 3000 mg / L using formation water with a salinity of 78300 mg / L. The contact angle of different swelling inhibitor compositions dropped on the surface of a hydrophilic glass slide was measured by the sessile drop method, and the experimental temperature was controlled at 20 °C. The test results are shown in Table 2.

[0096] Table 2 Contact angles of different swelling inhibitor compositions (unit: degree)

[0097] Composition number Contact angle (°) Formation water 19.8 FPJ-1 80.6 FPJ-2 68.3 FPJ-3 74.9 FPJ-4 75.5 FPJ-5 72.9 FPJ-6 70.2 FPJ-7 72.8 FPJ-8 73.3 DB-1 45.6 DB-2 44.3 DB-3 41.5

[0098] As can be seen from Table 2, the swelling inhibitor composition provided by the present invention can increase the wetting angle of the hydrophilic surface and reduce the degree of hydration of the formation surface.

[0099] Test Example 9

[0100] Measurement of anti-swelling rate: The swelling inhibitor composition was respectively prepared into solutions with mass fractions of 0.5% and 2%. Weigh 0.50 g of bentonite, put it into a 10 mL centrifuge tube, add 10 mL of the swelling inhibitor solution, shake well, let it stand at 20 °C for 2 h, put it into a centrifuge, and centrifuge at a rotation speed of 1500 r·min -1 for 15 min, and read the volume V 1 after the expansion of bentonite. Respectively replace the clay stabilizer solution with 10 mL of water and kerosene, and measure the expansion volumes V 2 and V 0 .

[0101] Anti-swelling rate calculation formula:

[0102]

[0103] where B: anti-swelling rate, %; V 0 : swelling volume of bentonite in kerosene, mL; V 1 : swelling volume of bentonite in clay stabilizer, mL; V 2 : swelling volume of bentonite in distilled water, mL.

[0104] The test results are shown in Table 3.

[0105] Table 3 Anti-swelling rates of different anti-swelling agent compositions

[0106]

[0107]

[0108] It can be seen from Table 3 that the anti-swelling agent composition provided by the present invention has good anti-swelling ability and can inhibit the hydration swelling and migration of clay particles.

[0109] The preferred embodiments of the present invention are disclosed above. Simple variations and combinations within the technical concept of the present invention should also be regarded as the content disclosed by the present invention and fall within the protection scope of the present invention.

Claims

1. An organic swelling inhibitor composition, based on the total mass of the composition, comprising: (1) A bisquaternary ammonium salt with a hydroxyl group-containing head group, 10% - 40%; (2) Esterified modified sophorolipid, 5% - 25%; (3) Inorganic salt, 0 - 15%; (4) The balance being water; The bisquaternary ammonium salt with a hydroxyl group-containing head group has a molecular structure as shown in Formula 1: In Formula 1, the group R is C 4-24 alkyl, n is an integer from 4 to 12, and X is Cl or Br; The molecular structure of the esterified modified sophorolipid is as shown in Formula 2: In Formula 2, the group R is C 1-4 alkyl group.

2. The composition according to claim 1, wherein, based on the total mass of the composition, comprising: (1) A bisquaternary ammonium salt with a hydroxyl group-containing head group, 20% - 30%; (2) Esterified modified sophorolipid, 10% - 20%; (3) Inorganic salt, 1 - 10%; (4) The balance being water.

3. The composition according to claim 1, wherein, In Formula 1, the group R is C 8-20 alkyl, and n is an integer from 4 to 8.

4. The composition according to claim 1, wherein, The preparation method of the bisquaternary ammonium salt with a hydroxyl group-containing head group comprises: (1) Mixing an alkyl halide, diethanolamine and a solvent, reacting at the reflux temperature, and removing the solvent to obtain an intermediate product; (2) Mixing the intermediate product with a dihalide and a solvent, stirring and reacting at the reflux temperature, and after removing the solvent, obtaining a white solid, which is the bisquaternary ammonium salt with a hydroxyl group-containing head group; Among them, in step (2), the dihalide is selected from bromo- or chloro-C 4-12 alkanes.

5. The composition according to claim 4, wherein, In step (1), the halogenated alkane is selected from brominated or chlorinated C 4-24 alkanes.

6. The composition according to claim 4, wherein, In step (1), the halogenated alkane is selected from brominated or chlorinated C 8-20 alkanes.

7. The composition according to claim 4, wherein, In step (1), the alkyl halide is selected from one or more of 1-bromododecane, 1-bromotetradecane, and 1-bromohexadecane.

8. The composition according to claim 4, wherein, In step (2), the dihalide is selected from brominated or chlorinated C 4-8 alkanes.

9. The composition according to claim 4, wherein, In step (2), the dihalide is selected from one or more of 1,4-dibromobutane, 1,6-dibromohexane, 1,8-dibromooctane, 1,4-dichlorobutane, 1,6-dichlorohexane, and 1,8-dichlorooctane.

10. The composition according to claim 1, wherein, The inorganic salt is selected from chlorides or phosphates of potassium, sodium, ammonium, magnesium, and calcium.

11. The composition according to claim 1, wherein, The inorganic salt is selected from one or more mixtures of potassium chloride, sodium chloride, ammonium chloride, magnesium chloride, calcium chloride, ammonium phosphate, and ammonium chloride.

12. The preparation method of the organic swelling inhibitor composition according to any one of claims 1 - 11, comprising: Mixing the bisquaternary ammonium salt with a hydroxyl group-containing head group, the esterified modified sophorolipid, the inorganic salt, and water, and stirring evenly.

13. The application of the organic swelling inhibitor composition according to any one of claims 1 - 11 in a low-permeability reservoir or a tight reservoir.

14. The application according to claim 13, wherein comprising: Preparing the swelling inhibitor composition into a solution with a mass fraction of 0.3% - 20%, and injecting it into the formation from an injection well or an oil well.

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