Compositions with reduced shear-thinning function, methods of making and using the same, and slickwater

Abstract

This invention relates to the field of oil and gas field development, and discloses a composition with shear-thinning function, its preparation method, and its application in slickwater. The composition comprises: a polymer, a quaternary ammonium salt with fewer than 7 carbon atoms, and an organic acid salt containing C8-C20 alkyl groups; wherein the polymer's chemical structure includes amide groups, sulfonic acid groups, phosphonic acid groups, and polyoxyethylene ether polyoxypropylene groups, and the polymer has a viscosity-average molecular weight of 5-10 million g / mol; the mass ratio of the polymer, quaternary ammonium salt, and organic acid salt containing C8-C20 alkyl groups is 0.03-10:0.3-5:1. Slickwater prepared using this composition can achieve the effect of mitigating shear-thinning and can be applied in fields such as oilfield exploration and development.

Description

Technical Field

[0001] This invention relates to the field of oil and gas field development technology, specifically to a composition with shear thinning mitigation function, its preparation method, and its application in slickwater. Background Technology

[0002] In recent years, with the continuous deepening of deep shale oil and gas exploration and development, higher apparent viscosity requirements have been placed on the performance of slickwater used for fracturing. Existing slickwater fracturing fluids are usually prepared by adding drag-reducing agents of different concentrations to form slickwater with different viscosities. In order to achieve higher viscosity of slickwater, it is necessary to continuously increase the concentration of drag-reducing agents. Since existing slickwater is a shear-thinning non-Newtonian flow fluid, that is, the apparent viscosity decreases with the increase of shear rate, and the more obvious the non-Newtonian flow pattern, the greater the influence of shear rate on apparent viscosity. In the fracturing operation under high displacement conditions, the shear rate is usually relatively high. Increasing the concentration of drag-reducing agents can mitigate the influence of high shear rate, but the actual apparent viscosity is still low, and may not even meet the high viscosity requirements of fracturing. Therefore, the apparent viscosity of slickwater designed without considering shear-thinning cannot truly reflect the viscosity of slickwater in the actual operation process. At the same time, slickwater with a certain shear-thinning inhibition effect is beneficial to exert the effect of higher viscosity of slickwater, which promotes the effective stimulation of deep shale oil and gas.

[0003] Existing technologies for slowing down or inhibiting shear thinning in slick water are limited. Therefore, there is a need for a composition with shear thinning function, its preparation method, and its application in slick water. Summary of the Invention

[0004] The purpose of this invention is to overcome the problem of the lack of shear thinning reduction or inhibition technology in the prior art, and to provide a composition with shear thinning reduction function, its preparation method and application in slick water.

[0005] To achieve the above objective, a first aspect of the present invention provides a composition having the function of mitigating shear thinning, characterized in that the composition comprises: a polymer, a quaternary ammonium salt with a C7 or lower concentration, and an organic acid salt containing C8-C20 alkyl groups;

[0006] The polymer has a chemical structure including amide groups, sulfonic acid groups, phosphonic acid groups and polyoxyethylene ether polyoxypropylene groups, and the polymer has a weight-average molecular weight of 5 million to 10 million g / mol.

[0007] The mass ratio of the polymer, quaternary ammonium salt, and organic acid salt containing C8-C20 alkyl groups is 0.03-10:0.3-5:1.

[0008] A second aspect of the present invention provides a method for preparing a composition having a shear-thinning mitigation function, characterized in that the method comprises:

[0009] The polymer, a quaternary ammonium salt with fewer than C7 atoms, an organic acid salt containing C8-C20 alkyl groups, and optionally a zirconium-containing compound are mixed to obtain a composition.

[0010] The polymers, quaternary ammonium salts with a C7 or lower, organic acid salts containing C8-C20 alkyl groups, and zirconium-containing compounds are defined in the same way as those defined in the first aspect of this invention.

[0011] A third aspect of the present invention provides the use of the compositions described in the first and / or third aspects of the present invention in mitigating shear thinning.

[0012] A fourth aspect of the present invention provides a slippery water, characterized in that the slippery water contains 0.2-2.8% by weight of the composition as described above.

[0013] Through the above technical solutions, the slickwater prepared using the composition provided by the present invention can achieve the effect of slowing down shear thinning and can be applied to fields such as oilfield exploration and development. Attached Figure Description

[0014] Figure 1 It is the curve showing the relationship between the apparent viscosity of the slippery water that slows down shear thinning and the shear rate. Detailed Implementation

[0015] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0016] As mentioned above, the first aspect of the present invention provides a composition having the function of mitigating shear thinning, characterized in that the composition comprises: a polymer, a quaternary ammonium salt with a C7 or lower concentration, and an organic acid salt containing C8-C20 alkyl groups;

[0017] The polymer has a chemical structure including amide groups, sulfonic acid groups, phosphonic acid groups and polyoxyethylene ether polyoxypropylene groups, and the polymer has a weight-average molecular weight of 5 million to 10 million g / mol.

[0018] The mass ratio of the polymer, the quaternary ammonium salt, and the organic acid salt containing C8-C20 alkyl groups is 0.03-10:0.3-5:1 (e.g., 0.03:5:1, 1:1:1, 2:1:1, 3:1:1, 4:1:1, 5:1:1, 6:1:1, 7:1:1, 8:1:1, 9:1:1, 10:1:1, 10:0.3:1, or any value between the above).

[0019] In some embodiments of the present invention, preferably, the polymer comprises structural units shown in Formulas 1 to 4:

[0020]

[0021]

[0022] In this invention, the twelve R1s, two R3s and one R4 in Formulas 1 to 4 are the same or different and are each independently selected from methoxy, ethoxy, hydroxymethyl, methyl, and hydrogen, preferably methoxy, ethoxy, hydroxymethyl, and hydrogen, and more preferably methyl, methoxy, and hydroxymethyl.

[0023] In some embodiments of the present invention, preferably, the four R2s in Formulas 1 to 4 are the same or different and are each independently selected from ethylene, methylethylene, and hydroxyethylene, preferably ethylene or methylethylene, and more preferably ethylene.

[0024] In some embodiments of the present invention, preferably, n is selected from natural numbers between 20,000 and 50,000.

[0025] In some embodiments of the present invention, preferably, the mass ratio of the structural units shown in Formulas 1 to 4 (or amide group, sulfonic acid group, phosphonic acid group and polyoxyethylene ether polyoxypropylene group) is 1:0.1-0.5:0.05-0.1:0.01-0.05, more preferably 1:0.1-0.2:0.06-0.08:0.02-0.04.

[0026] In this invention, the mass ratio of the structural units shown in Formulas 1 to 4 can be calculated by the amount of compounds shown in Formulas A to D.

[0027] In some embodiments of the present invention, preferably, the polymer has a viscosity-average molecular weight of 5 million to 10 million g / mol.

[0028] In this invention, the weight-average molecular weight of the polymer can be determined by the intrinsic viscosity method.

[0029] In this invention, there are no particular limitations on the source and preparation method of the polymer. Those skilled in the art can synthesize the polymer themselves by purchasing it commercially or by combining common knowledge and conventional methods of organic chemistry. For example, the preparation method of the polymer may include: contacting the compound represented by formula AD and carrying out a copolymerization reaction;

[0030]

[0031] In some embodiments of the present invention, the copolymerization reaction is carried out in the presence of a protective gas, an initiator, and a solvent.

[0032] In some embodiments of the present invention, the initiator is selected from ammonium persulfate and / or potassium sulfite redox systems.

[0033] In some embodiments of the present invention, the solvent is water, preferably deionized water.

[0034] In some embodiments of the present invention, the protective gas may be a common gas that provides an inert atmosphere, such as nitrogen and / or argon.

[0035] In some embodiments of the present invention, the mass ratio of the compounds represented by formulas A to D is 1:0.1-0.5:0.05-0.1:0.01-0.05, preferably 1:0.1-0.2:0.06-0.08:0.02-0.04.

[0036] In some embodiments of the present invention, the copolymerization reaction is carried out at a temperature of 10-20°C for a time of 2-8 hours.

[0037] The temperature range of this copolymerization reaction is more favorable for obtaining polymer products with a viscosity-average molecular weight of 5 million to 10 million g / mol.

[0038] In some embodiments of the present invention, preferably, the quaternary ammonium salt is selected from compounds with a molecular weight of less than 500 g / mol, preferably hydroxyalkyl and methyl-substituted compounds, and more preferably at least one of dihydroxymethyldimethylammonium chloride, hydroxypropyltrimethylammonium chloride and hydroxyethyltrimethylammonium chloride.

[0039] In some embodiments of the present invention, preferably, the organic acid salt containing C8-C20 alkyl is selected from C8-C20 alkyl sulfate or C8-C20 alkyl sulfonate, preferably C12-C18 alkyl sulfonate, and more preferably C12 alkyl sulfonate.

[0040] In some embodiments of the present invention, preferably, the composition may further include zirconium-containing compounds with a C7 or lower.

[0041] In some embodiments of the present invention, preferably, the zirconium compound is selected from organic or inorganic zirconium acids, more preferably at least one of zirconium citrate, zirconium lactate, zirconium acetate and zirconium nitrate.

[0042] In some embodiments of the present invention, preferably, the weight ratio of the zirconium-containing compound to the polymer is 0-100:1 (e.g., 0, 0.001:1, 0.002:1, 0.004:1, 0.008:1, 0.01:1, 0.1:1, 1:1, 10:1, 100:1 or any value between the above values), preferably 0.001-0.01:1.

[0043] In some embodiments of the present invention, preferably, the composition may further include water.

[0044] In some embodiments of the present invention, preferably, the water content is 97.2-99.8 wt% (e.g., 97.2 wt%, 97.4 wt%, 97.6 wt%, 97.8 wt%, 98.0 wt%, 98.2 wt%, 98.4 wt%, 98.6 wt%, 98.8 wt%, 99.0 wt%, 99.2 wt%, 99.4 wt%, 99.6 wt%, 99.8 wt%, or any value between the above values) based on the total weight of the composition, preferably 98.2-99.2 wt%.

[0045] In some embodiments of the present invention, preferably, the mass ratio of the polymer, the quaternary ammonium salt, and the organic acid salt containing C8-C20 alkyl groups is 0.5-10:0.5-3:1.

[0046] In some embodiments of the present invention, preferably, the mass ratio of the polymer, the quaternary ammonium salt, and the organic acid salt containing C8-C20 alkyl groups is 1-10:1-2:1.

[0047] A second aspect of the present invention provides a method for preparing a composition having a shear-thinning mitigation function, characterized in that the method comprises:

[0048] The polymer, a quaternary ammonium salt with fewer than C7 atoms, an organic acid salt containing C8-C20 alkyl groups, and optionally a zirconium-containing compound are mixed to obtain a composition.

[0049] The polymers, quaternary ammonium salts with a C7 or lower, organic acid salts containing C8-C20 alkyl groups, and zirconium-containing compounds are defined in the same way as those defined in the first aspect of this invention.

[0050] In some embodiments of the present invention, preferably, the mixing is carried out in the presence of a solvent, wherein the solvent is water.

[0051] In this invention, there are no particular limitations on the mixing temperature and time, but preferably, the temperature is 20-40°C and the time is 5-40 min.

[0052] The third aspect of the present invention provides a composition prepared by the method described in the second aspect of the present invention.

[0053] The fourth aspect of the present invention provides the use of the compositions described in the first and / or third aspects of the present invention in mitigating shear thinning.

[0054] A fifth aspect of the present invention provides a slippery liquid, characterized in that the slippery liquid contains 0.2-2.8% by weight of the composition as described above. Generally, the slippery liquid also contains 97.2-99.8% by weight of water.

[0055] The present invention will be described in detail below through examples. In the following examples, the hydroxypropyltrimethylammonium chloride raw material is a commercially available product of Sigma-Aldrich (Shanghai) Trading Co., Ltd.; the sodium dodecylbenzenesulfonate raw material is a commercially available product of Shanghai Maclean Biochemical Technology Co., Ltd.; and the zirconium acetate raw material is a commercially available product of Shanghai Aladdin Biochemical Technology Co., Ltd.

[0056] The apparent viscosity was tested / calculated using a six-speed rotational viscometer at 100, 300, and 600 rpm. Stable scale data were read, and the apparent viscosity was calculated by multiplying the scale data by 3, 1, and 0.5 for each speed.

[0057] The method for testing / calculating the flow index (n) involves using a six-speed rotational viscometer to measure the liquid readings at 600 rpm and 300 rpm, and then calculating the flow index (n) according to the formula 3.322 × Log(600 rpm reading / 300 rpm reading).

[0058] Preparation Example

[0059] In the presence of nitrogen, 20g of compound A, 2g of compound B, 1.2g of compound C, and 0.4g of compound D were dissolved in 100g of deionized water. 0.01g of initiator (ammonium persulfate / potassium bisulfite = 1:1) was added. The resulting reaction system was heated to 10°C and subjected to copolymerization for 8 hours. After granulation and drying, a polymer with a viscosity-average molecular weight of 9 million g / mol was obtained.

[0060] Wherein, R1 is methoxy; R2 is ethylene; R3 is hydroxymethyl; R4 is methyl; and n is 40,000. Polymers prepared from compounds of formulas A to D with other R1 to R4 substituents and n values ​​are prepared using the same method as described above, and will not be repeated here.

[0061] Example 1

[0062] In 997g of water, under stirring conditions, 1g of the polymer prepared in the above preparation example was added, followed by 1g of hydroxypropyltrimethylammonium chloride and 1g of sodium dodecylbenzenesulfonate. The mixture was stirred until homogeneous to obtain a composition, denoted as S1. The readings were then measured using a six-speed rotational viscometer at 100, 300, and 600 rpm (shear rate) to calculate the apparent viscosity and flow index (n) values.

[0063] Example 2

[0064] In 996g of water, under stirring conditions, 2g of a polymer (composed of chemical structures shown in Formulas 1 to 4, in a ratio of 1:0.2:0.08:0.04, where R1 is hydroxymethyl; R2 is ethylene; R3 is methoxy; R4 is methyl; n is 30,000; and the weight-average molecular weight is 6 million g / mol) was added. Then, 1g of hydroxypropyltrimethylammonium chloride and 1g of sodium dodecylbenzenesulfonate were added sequentially and mixed evenly to obtain a composition, denoted as S2. The readings were then measured using a six-speed rotational viscometer at 100, 300, and 600 rpm, and the apparent viscosity and n value were calculated.

[0065] Example 3

[0066] In 994g of water, under stirring conditions, 4g of a polymer (composed of chemical structures shown in Formulas 1 to 4, in a ratio of 1:0.1:0.06:0.02, where R1 is methoxy; R2 is ethylene; R3 is hydroxymethyl; R4 is methyl; n is 40,000; and the weight-average molecular weight is 9 million g / mol) was added. Then, 1g of hydroxypropyltrimethylammonium chloride and 1g of sodium dodecylbenzenesulfonate were added sequentially and mixed evenly to obtain a composition, denoted as S3. The readings were then measured using a six-speed rotational viscometer at 100, 300, and 600 rpm, and the apparent viscosity and n value were calculated.

[0067] Example 4

[0068] In 992g of water, under stirring conditions, 6g of the polymer prepared in the above preparation example was added, followed by 1g of hydroxypropyltrimethylammonium chloride and 1g of sodium dodecylbenzenesulfonate. The mixture was stirred until homogeneous to obtain a composition, denoted as S4. The readings were then measured at 100, 300, and 600 rpm using a six-speed rotational viscometer, and the apparent viscosity and n value were calculated.

[0069] Example 5

[0070] In 990g of water, under stirring conditions, 8g of the polymer prepared in the above preparation example was added, followed by 1g of hydroxypropyltrimethylammonium chloride and 1g of sodium dodecylbenzenesulfonate. The mixture was stirred until homogeneous to obtain a composition, denoted as S5. The readings were then measured at 100, 300, and 600 rpm using a six-speed rotational viscometer, and the apparent viscosity and n value were calculated.

[0071] Example 6

[0072] In 982g of water, under stirring conditions, 10g of the polymer prepared in the above preparation example was added, followed by 1g of hydroxypropyltrimethylammonium chloride and 1g of sodium dodecylbenzenesulfonate. The mixture was stirred until homogeneous to obtain a composition, denoted as S6. The readings were then measured at 100, 300, and 600 rpm using a six-speed rotational viscometer, and the apparent viscosity and n value were calculated.

[0073] Example 7

[0074] In 996g of water, under stirring, 1g of the polymer prepared in the above preparation example was added, followed by 1g of hydroxypropyltrimethylammonium chloride and 1g of sodium dodecylbenzenesulfonate. The mixture was stirred until homogeneous to obtain a composition, denoted as S7. Then, 1g of zirconium acetate was added for crosslinking under stirring. The readings were then measured at 100, 300, and 600 rpm using a six-speed rotational viscometer, and the apparent viscosity and n value were calculated.

[0075] Example 8

[0076] In 995g of water, under stirring, 2g of the polymer prepared in the above preparation example was added, followed by 1g of hydroxypropyltrimethylammonium chloride and 1g of sodium dodecylbenzenesulfonate. The mixture was stirred until homogeneous to obtain a composition, denoted as S8. Then, 1g of zirconium acetate was added for crosslinking under stirring. The readings were then measured at 100, 300, and 600 rpm using a six-speed rotational viscometer, and the apparent viscosity and n value were calculated.

[0077] Example 9

[0078] In 993g of water, under stirring, 4g of the polymer prepared in the above preparation example was added, followed by 1g of hydroxypropyltrimethylammonium chloride and 1g of sodium dodecylbenzenesulfonate. The mixture was stirred until homogeneous to obtain a composition, denoted as S9. Then, 1g of zirconium acetate was added for crosslinking under stirring. The readings were then measured at 100, 300, and 600 rpm using a six-speed rotational viscometer, and the apparent viscosity and n value were calculated.

[0079] Example 10

[0080] In 986g of water, under stirring, 6g of the polymer prepared in the above preparation example was added, followed by 1g of hydroxypropyltrimethylammonium chloride and 1g of sodium dodecylbenzenesulfonate. The mixture was stirred until homogeneous to obtain a composition, denoted as S10. Then, 6g of zirconium acetate was added for crosslinking under stirring. The readings were then measured at 100, 300, and 600 rpm using a six-speed rotational viscometer, and the apparent viscosity and n value were calculated.

[0081] Example 11

[0082] In 982g of water, under stirring conditions, 8g of the polymer prepared in the above preparation example was added, followed by 1g of hydroxypropyltrimethylammonium chloride and 1g of sodium dodecylbenzenesulfonate. The mixture was stirred until homogeneous to obtain a composition, denoted as S11. Then, 8g of zirconium acetate was added for crosslinking under stirring conditions. The readings were then measured at 100, 300, and 600 rpm using a six-speed rotational viscometer, and the apparent viscosity and n value were calculated.

[0083] Example 12

[0084] In 918g of water, under stirring, 10g of the polymer prepared in the above preparation example was added, followed by 1g of hydroxypropyltrimethylammonium chloride and 1g of sodium dodecylbenzenesulfonate. The mixture was stirred until homogeneous to obtain a composition, denoted as S12. Then, 10g of zirconium acetate was added for crosslinking under stirring. The readings were then measured at 100, 300, and 600 rpm using a six-speed rotational viscometer, and the apparent viscosity and n value were calculated.

[0085] Comparative Example 1

[0086] The method of Example 1 was followed, except that partially hydrolyzed polyacrylamide (viscosity-average molecular weight 10 million g / mol, degree of hydrolysis 20%) was used to replace the polymer prepared in the above preparation example to obtain a composition, denoted as D1. Then, the readings were measured at 100, 300, and 600 rpm using a six-speed rotational viscometer, and the apparent viscosity and n value were calculated.

[0087] Comparative Example 2

[0088] The method of Example 1 was followed, except that supramolecular polyacrylamide (viscosity-average molecular weight 8 million g / mol, octadecyl hydrophobic associating monomer 3 wt%, degree of hydrolysis 20%) was used to replace the polymer prepared in the above preparation example to obtain a composition, denoted as D2. Then, the readings were measured at 100, 300, and 600 rpm using a six-speed rotational viscometer, and the apparent viscosity and n value were calculated.

[0089] Comparative Example 3

[0090] The method of Example 1 was followed, except that the polymer prepared in the above preparation example was replaced with a polyacrylamide-acrylic acid copolymer (viscosity-average molecular weight of 10 million g / mol, acrylic acid monomer of 20 wt%, degree of hydrolysis of 20%) to obtain a composition, denoted as D3. Then, the readings were measured at 100, 300, and 600 rpm using a six-speed rotational viscometer, and the apparent viscosity and n value were calculated.

[0091] Comparative Example 4

[0092] The method of Example 7 was followed, except that partially hydrolyzed polyacrylamide (viscosity-average molecular weight 10 million g / mol, degree of hydrolysis 20%) was used to replace the polymer prepared in the above preparation example to obtain a composition, denoted as D4. The readings at 100, 300 and 600 rpm were then measured using a six-speed rotational viscometer, and the apparent viscosity and n value were calculated.

[0093] Comparative Example 5

[0094] The method of Example 7 was followed, except that supramolecular polyacrylamide (viscosity-average molecular weight 8 million g / mol, octadecyl hydrophobic associating monomer 3 wt%, degree of hydrolysis 20%) was used to replace the polymer prepared in the above preparation example, denoted as D5. Then, the readings were measured at 100, 300, and 600 rpm using a six-speed rotational viscometer, and the apparent viscosity and n value were calculated.

[0095] Comparative Example 6

[0096] The method of Example 7 was followed, except that a polyacrylamide-acrylic acid copolymer (viscosity-average molecular weight 10 million g / mol, acrylic acid monomer 20 wt%, degree of hydrolysis 20%) was used to replace the polymer prepared in the above preparation example, denoted as D6. Then, the readings were measured at 100, 300, and 600 rpm using a six-speed rotational viscometer, and the apparent viscosity and n value were calculated.

[0097] Comparative Example 7

[0098] The method of Example 7 was followed, except that the polymer was not added, and a composition was obtained, denoted as D7. Then, the readings were tested at 100, 300, and 600 rpm using a six-speed rotational viscometer, and the apparent viscosity and n value were calculated.

[0099] Comparative Example 8

[0100] The method of Example 7 was followed, except that the quaternary ammonium salt was not added, and a composition was obtained, denoted as D8. Then, the readings were tested at 100, 300, and 600 rpm using a six-speed rotational viscometer, and the apparent viscosity and n value were calculated.

[0101] Comparative Example 9

[0102] The method of Example 7 was followed, except that the organic acid salt was not added, and a composition was obtained, denoted as D9. Then, the readings were tested at 100, 300, and 600 rpm using a six-speed rotational viscometer, and the apparent viscosity and n value were calculated.

[0103] Comparative Example 10

[0104] The method of Example 7 was followed, except that the mass ratio of the polymer, quaternary ammonium salt and organic acid salt was 0.02:1:1 to obtain a composition, denoted as D10. Then, the readings were measured at 100, 300 and 600 rpm using a six-speed rotational viscometer, and the apparent viscosity and n value were calculated.

[0105] The apparent viscosity of the compositions described in Examples 1-4 at different shear rates is as follows: Figure 1 As shown. In Figure 1 In this study, as the mass concentration of the polymer in the composition increases, the concentration of the composition at different shear rates also increases. The apparent viscosity of composition S1 with a polymer concentration of 0.1 wt% is less than 5 mPa·s at different shear rates, while when the polymer concentration reaches 0.6 wt%, the apparent viscosity of the corresponding composition S4 reaches above 30 mPa·s at all shear rates, demonstrating the beneficial effect of the polymer and the corresponding composition in mitigating shear thinning.

[0106] The apparent viscosity and n value of the compositions prepared in each embodiment and comparative example are shown in Table 1.

[0107] Table 1

[0108] Composition Apparent viscosity (mPa·s) Flow index (n) value S1 4.5 0.85 S2 10.5 0.76 S3 21.0 0.66 S4 36.0 0.63 S5 57.0 0.68 S6 81.0 0.65 S7 9.0 0.75 S8 18.0 0.60 S9 39.0 0.67 S10 57.0 0.63 S11 84.0 0.62 S12 105.0 0.64 D1 6.5 0.55 D2 4.5 0.51 D3 6.5 0.49 D4 7.5 0.50 D5 6.5 0.45 D6 4.5 0.48 D7 1.0 - D8 7.5 0.57 D9 6.6 0.59 D10 1.5 -

[0109] As can be seen from the results in Table 1, the embodiments using the technical solution of the present invention have significantly better effects than the comparative examples, such as higher apparent viscosity and flow index, indicating that the slickwater prepared by the technical solution of the present invention can achieve the effect of slowing down shear thinning.

[0110] The preferred embodiments of the present invention have been described in detail above; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various technical features in any other suitable manner. These simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A composition having a reduced shear-thinning function, characterized in that, The composition comprises: a polymer, a quaternary ammonium salt with fewer than C7 atoms, and an organic acid salt containing C8-C20 alkyl groups; The polymer has a chemical structure including amide groups, sulfonic acid groups, phosphonic acid groups and polyoxyethylene ether polyoxypropylene groups, and the polymer has a viscosity-average molecular weight of 5 million to 10 million g / mol. The mass ratio of the polymer, quaternary ammonium salt, and organic acid salt is 0.03-10:0.3-5:

1.

2. The composition of claim 1, wherein, The polymer includes structural units shown in Formulas 1 to 4: Wherein, the twelve R1s, two R3s and one R4 in Formulas 1 to 4 are the same or different and are each independently selected from methoxy, ethoxy, hydroxymethyl, methyl, hydrogen, preferably methoxy, ethoxy, hydroxymethyl, hydrogen, more preferably methyl, methoxy, hydroxymethyl; Preferably, the four R2s in Formulas 1 to 4 are the same or different and are each independently selected from ethylene, methylethylene, and hydroxyethylene, preferably ethylene or methylethylene, and more preferably ethylene; Preferably, n is selected from natural numbers between 20,000 and 50,000; Preferably, the mass ratio of the structural units shown in Formulas 1 to 4 is 1:0.1-0.5:0.05-0.1:0.01-0.05, and more preferably 1:0.1-0.2:0.06-0.08:0.02-0.04; Preferably, the polymer has a viscosity-average molecular weight of 5 million to 10 million g / mol.

3. The composition according to claim 1 or 2, wherein, The quaternary ammonium salt is selected from compounds with a molecular weight of less than 500 g / mol, preferably hydroxyalkyl and methyl-substituted compounds, and more preferably at least one of dihydroxymethyldimethylammonium chloride, hydroxypropyltrimethylammonium chloride and hydroxyethyltrimethylammonium chloride.

4. The composition according to any one of claims 1-3, wherein, The organic acid salt containing C8-C20 alkyl groups is selected from C8-C20 alkyl sulfates or C8-C20 alkyl sulfonates, preferably C12-C18 alkyl sulfonates, and more preferably C12 alkyl sulfonates.

5. The composition according to any one of claims 1-4, wherein, The composition also includes zirconium-containing compounds with a C7 or lower. Preferably, the zirconium-containing compound is selected from organic zirconium acids and / or inorganic zirconium acids, more preferably at least one of zirconium citrate, zirconium lactate, zirconium acetate and zirconium nitrate.

6. The composition according to claim 5, wherein, The weight ratio of the zirconium-containing compound to the polymer is 0-100:1, preferably 0.001-0.01:

1.

7. The composition according to any one of claims 1-6, wherein, The composition also includes water; Preferably, the water content is 97.2-99.8 wt%, more preferably 98.2-99.2 wt%, based on the total weight of the composition.

8. The composition according to any one of claims 1-7, wherein, The mass ratio of the polymer, quaternary ammonium salt, and organic acid salt containing C8-C20 alkyl groups is 0.5-10:0.5-3:

1.

9. The composition according to claim 8, wherein, The mass ratio of the polymer, quaternary ammonium salt, and organic acid salt containing C8-C20 alkyl groups is 1-10:1-2:

1.

10. A method for preparing a composition having the function of mitigating shear thinning, characterized in that, The method includes: The polymer, a quaternary ammonium salt with fewer than C7 atoms, an organic acid salt containing C8-C20 alkyl groups, and optionally a zirconium-containing compound are mixed to obtain a composition. The polymer, quaternary ammonium salt with a C7 or lower, organic acid salt containing C8-C20 alkyl groups, and zirconium-containing compounds are defined in the same way as those defined in any one of claims 1-9.

11. The use of the composition according to any one of claims 1-9 in mitigating shear thinning.

12. A type of slippery water, characterized in that, The slippery liquid contains 0.2-2.8% by weight of the composition according to any one of claims 1-9.

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