A layered tackifier and its preparation method and application

Abstract

The present invention discloses a layered tackifier, belonging to the field of oilfield chemical technology, and specifically relates to a layered tackifier, its preparation method, and application, including a layered material and a tackifier. The layered material is a two-dimensional transition metal carbide, and the raw materials for preparing the tackifier include 2-acrylamide-2-methylpropanesulfonic acid, a quaternary ammonium salt monomer, and a thermal tackifier monomer. The tackifier is a polymer prepared from 2-acrylamide-2-methylpropanesulfonic acid, a quaternary ammonium salt monomer, and a thermal tackifier monomer. The layered tackifier is used to improve the suspension stability of high-density cement slurry, can meet high-temperature construction environments of 150°C to 210°C, and the density difference of the cured cement slurry after standing for two hours is less than 0.03g / cm 3 .

Description

Technical Field

[0001] The present invention relates to the technical field of oilfield chemistry, and in particular to a layered tackifier, a preparation method and an application thereof. Background Art

[0002] High-temperature, high-density cement slurry systems face the technical challenge of difficult-to-control sedimentation stability. Three main reasons for the thinning of cement slurries at high temperatures are: first, Brownian motion of the solid particles in the slurry reduces the structural forces between the particles; second, the high-temperature decomposition and ineffectiveness of viscosity-enhancing admixtures (such as fluid loss additives); and third, the high-temperature decomposition of admixtures produces small molecular groups with dispersing properties. Adding viscosity-enhancing agents to the cement slurry system is an effective solution to these problems.

[0003] Common thickeners are divided into inorganic thickeners and polymer thickeners. Inorganic thickeners mainly include: silica fume, metakaolin, hollow microspheres, nanomaterials, etc. Inorganic adhesives have good temperature resistance, but the hydration time of some inorganic materials is uncontrollable, and some materials have an adverse effect on the strength development of cement paste. Natural polymer thickeners have poor temperature resistance and the operating temperature is below 100°C, so they usually need to be used in combination; although synthetic polymer thickeners have improved temperature resistance (around 150°C), the hydrogen bonding between the polymer and water molecules is destroyed in ultra-high temperature environments, increasing the freedom of movement of water molecules, thereby reducing the liquid phase viscosity of the cement slurry and causing the cement slurry to settle and become unstable. In addition, most polymer thickeners tend to thicken the slurry due to the steric effect of the chain segments themselves when mixed at low temperatures, making it difficult to pump, resulting in the problem of "thickening at low temperatures and thinning at high temperatures."

[0004] Chinese patent document CN106967397A uses cellulose and alkylene oxide to undergo an etherification reaction, followed by a hydrophobic modification reaction with long-chain halogenated alkanes, to produce a viscosifier with thermal viscosity-increasing properties. Compared with xanthan gum, bentonite, and hydroxyethyl cellulose viscosifiers, cement slurries containing 0.6% of the synthetic viscosifier have a lower initial consistency, less water loss, and an adjustable thickening time. However, this viscosifier begins to increase viscosity at around 35°C, and excessive addition may affect cementing construction safety.

[0005] Chinese patent document CN105199690A uses bentonite and AMPS / AM / DMAA / hydrophobic monomer copolymer to compound a suspension stabilizer, but its temperature resistance is only 170°C.

[0006] Chinese patent document CN107629771A discloses a multi-branched AMPS / DMAA / AA / NVP copolymer suspension stabilizer, which has a temperature resistance of 150°C and does not thicken at low temperatures or dilute at high temperatures. However, it is not suitable for deep and ultra-deep well cementing requirements at higher temperatures.

[0007] In summary, both inorganic and polymer materials have certain issues that make them difficult to apply to ultra-high temperature cement slurry systems. Therefore, the development of ultra-high temperature (>200°C) cement slurry viscosifiers that "do not increase viscosity at low temperatures but increase viscosity at high temperatures" is of great significance for ensuring cementing operation safety and improving overall cementing quality. Summary of the Invention

[0008] The present invention addresses the problems in the prior art of viscosity enhancers used in cementing slurries, such as insufficient temperature resistance, which affects the strength of the cement slurry, and "low-temperature viscosity enhancement and high-temperature dilution", which fail to meet the requirements for ultra-high temperature cementing field applications. The present invention provides a layered viscosity enhancer, a preparation method, and an application thereof, and develops an ultra-high temperature viscosity enhancer with a temperature resistance of up to 210°C, breaking through the ultra-high temperature technical bottleneck of traditional viscosity enhancers and providing technical support for ultra-high temperature deep well cementing slurry systems.

[0009] To solve the above technical problems, the first aspect of the present invention provides a layered tackifier, comprising a layered material and a tackifier, wherein the layered material is a two-dimensional transition metal carbide, and the raw materials for preparing the tackifier include 2-acrylamido-2-methylpropanesulfonic acid, a quaternary ammonium salt monomer, and a thermal tackifier monomer. The tackifier is a polymer prepared from 2-acrylamido-2-methylpropanesulfonic acid, a quaternary ammonium salt monomer, and a thermal tackifier monomer; and 2-acrylamido-2-methylpropanesulfonic acid (AMPS is a temperature-resistant monomer) and the quaternary ammonium salt monomer can further enhance the temperature resistance of the tackifier.

[0010] In the present invention, the layered material is a two-dimensional transition metal carbide, and the layered material has an "accordion structure" with an interlayer spacing greater than 50 nm, which can accommodate viscosity-enhancing polymer molecular chains.

[0011] The present invention uses an in-situ reduced-pressure polymerization preparation method to intercalate a viscosity-increasing material into the interlayers of a two-dimensional transition metal carbide, ultimately achieving the preparation of a composite material (layered viscosity-increasing agent); when the layered viscosity-increasing agent is mixed at a low temperature (less than 60°C), the viscosity-increasing agent molecules do not increase the slurry viscosity; at a high temperature (greater than or equal to 60°C), the viscosity-increasing agent molecular chains relax and are discharged from the interlayers, achieving a viscosity-increasing effect; at the same time, the outer shell layer of the two-dimensional transition metal carbide helps the intercalated viscosity-increasing material improve its temperature resistance, ensuring that it will not quickly decompose and fail at high temperatures, thereby achieving a slow-release viscosity-increasing effect.

[0012] According to some embodiments of the present invention, the two-dimensional transition metal carbide is selected from at least one of niobium carbide, vanadium carbide, molybdenum carbide and titanium carbide, preferably titanium carbide.

[0013] According to some embodiments of the present invention, the interlayer spacing of the two-dimensional transition metal carbide is 10 nm to 100 nm, preferably 50 nm to 100 nm.

[0014] According to some embodiments of the present invention, the mass ratio of the 2-acrylamido-2-methylpropanesulfonic acid, the quaternary ammonium salt monomer, the thermal tackifying monomer and the layered material is (20-60): (20-50): (10-20): (1-5), for example, 20:20:10:3, 60:50:20:5, 30:30:15:1, 40:40:10:2, 50:20:20:4, 20:20:15:3.

[0015] According to some embodiments of the present invention, the quaternary ammonium salt monomer is selected from at least one of dimethyldiallylammonium chloride, trimethylallylammonium chloride, acryloyloxyethyltrimethylammonium chloride, methacryloyloxyethyltrimethylammonium chloride, and N,N-octadecyldimethylallylammonium chloride, preferably N,N-octadecyldimethylallylammonium chloride.

[0016] According to some embodiments of the present invention, the thermal adhesion-increasing monomer is selected from at least one of diethyl acrylamide, N-isopropyl acrylamide, and N-hydroxymethyl acrylamide.

[0017] A second aspect of the present invention provides a method for preparing the above-mentioned layered tackifier, comprising mixing 2-acrylamido-2-methylpropanesulfonic acid, a quaternary ammonium salt monomer, a thermal tackifying monomer, and a layered material in water to obtain a mixed solution, and reacting the mixed solution to obtain the layered tackifier.

[0018] According to some embodiments of the present invention, the mass ratio of the total mass of the 2-acrylamido-2-methylpropanesulfonic acid, the quaternary ammonium salt monomer, the thermal tackifying monomer and the layered material to water is (53-135):200, for example, 53:200, 135:200, 76:200, 92:200, 94:200, 58:200;

[0019] According to some embodiments of the present invention, the pH of the mixed solution is adjusted to 7; preferably, the pH regulator of the mixed solution is selected from at least one of a sodium hydroxide solution and a potassium hydroxide solution with a mass fraction of 10% to 30%.

[0020] According to some embodiments of the present invention, an initiator is added to the reaction I; preferably, the amount of the initiator added is 0.1% to 0.5% of the total mass of 2-acrylamido-2-methylpropanesulfonic acid, quaternary ammonium salt monomer and thermal viscosity-increasing monomer, for example, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%; further preferably, the initiator is selected from at least one of ammonium persulfate and potassium persulfate.

[0021] According to some embodiments of the present invention, the conditions of reaction I include: temperature of 50°C to 80°C, for example, 50°C, 60°C, 70°C, 80°C, time of 2h to 6h, for example, 2h, 3h, 5h, 6h, and pressure of -0.05MPa.

[0022] According to some embodiments of the present invention, the reaction I further includes drying and crushing; preferably, the drying conditions include: a temperature of 30°C to 70°C, for example, 30°C, 40°C, 50°C, 60°C, 70°C, and a time of 24h to 48h, preferably 24h or 48h.

[0023] According to some embodiments of the present invention, the layered material is obtained by etching a MAX phase; preferably, the MAX phase is selected from Ti3AlC2.

[0024] According to some embodiments of the present invention, the etching includes first reacting the MAX phase with an etchant II, and then mixing with a stripper solution to perform stripping;

[0025] Preferably, the mass ratio of the MAX phase, the etchant, and the stripper is (1-3):(15-20):(5-15), for example, 1:20:10, 3:15:5, 2:17.5:15, 1.5:20:7.5, 2.5:15:12.5, and 1:17.5:7.5.

[0026] According to some embodiments of the present invention, the concentration of the etchant is 20 wt% to 60 wt%, for example, 20 wt%, 30 wt%, 40 wt%, 50 wt%, 60 wt%; preferably, the etchant is selected from at least one of HF, LiF, and HCl, preferably HF.

[0027] According to some embodiments of the present invention, the concentration of the stripping agent solution is 20 wt% to 60 wt%, preferably 50 wt%; preferably, the stripping agent is selected from at least one of dimethyl sulfoxide (DMSO), tetrabutylammonium hydroxide (TBAOH), tetramethylammonium hydroxide (TMAOH), and sodium hydroxide (NaOH), preferably dimethyl sulfoxide (DMSO).

[0028] In the present invention, the solvent in the stripping agent solution is water.

[0029] According to some embodiments of the present invention, the conditions of reaction II include: temperature of 30°C to 60°C, for example, 30°C, 40°C, 50°C, 60°C, and time of 12h to 48h, for example, 12h, 24h, 36h, 48h.

[0030] According to some embodiments of the present invention, the peeling conditions include: a temperature of 20° C. to 25° C., preferably 25° C., and a time of 30 minutes.

[0031] According to some embodiments of the present invention, the peeling further includes filtering and drying.

[0032] A third aspect of the present invention provides a use of the above-mentioned layered tackifier in cementing slurry.

[0033] According to some embodiments of the present invention, the amount of the layered tackifier added to the cementing slurry is 3 wt% to 8 wt% based on cement.

[0034] Beneficial effects:

[0035] The layered tackifier of the present invention is added to a high-density cement slurry system (density range 2.2 g / cm 3 ~2.5g / cm 3 ), the addition amount is 3% to 8% of the total mass of cement; the viscosity of the cement slurry is not significantly affected at low temperatures, the layered viscosity enhancer begins to increase viscosity at 60°C, the highest temperature resistance reaches 210°C, and the density difference of the cement slurry after curing is less than 0.03g / cm2 after standing for two hours 3 .

[0036] The present invention provides a layered tackifier for improving the suspension stability of high-density cement slurry, which can meet the high-temperature construction environment of 150°C to 210°C. The density difference of the cement slurry after curing is less than 0.03g / cm2 after standing for two hours. 3 .

[0037] The present invention provides a layered viscosity enhancer that can overcome the problem of traditional suspension stabilizers thickening at low temperatures and thinning at high temperatures, thereby improving cementing quality and safety.

[0038] The layered tackifier provided by the invention has an interlayer distance of 10nm to 100nm, is easy to ash at room temperature, and has little effect on the consistency of the slurry. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a SEM photograph of the layered tackifier D1 prepared in Example 1 of the present invention.

[0040] Figure 2 This is a SEM photograph of the layered tackifier D6 prepared in Example 6 of the present invention.

[0041] Figure 3 These are the thermogravimetric curves of the layered tackifiers D1 to D6 prepared in Examples 1-6 of the present invention.

[0042] Figure 4 These are the thermogravimetric curves of the tackifiers M1 to M7 prepared in Comparative Examples 1-7 of the present invention.

[0043] Figure 5This is the thickening curve when the layered tackifier D1 prepared in Example 1 of the present invention is added.

[0044] Figure 6 This is the thickening curve without adding the layered tackifier D1 prepared in Example 1 of the present invention.

[0045] Figure 7 This is the thickening curve of the layered tackifier M1 prepared in Comparative Example 1 of the present invention. DETAILED DESCRIPTION

[0046] The present invention will be further described below with reference to the following examples, but the present invention is not limited to these examples.

[0047] Ti3AlC2 in the present invention was purchased from Hangzhou Yanqu Co., Ltd. with a specification of 10g.

[0048] DMSO in the present invention was purchased from Beijing Yinuokai Technology Co., Ltd. with a specification of 500 mL.

[0049] The 2-acrylamido-2-methylpropanesulfonic acid in the present invention was purchased from Beijing Wokai Biotechnology Co., Ltd. with a specification of 500 g.

[0050] In the present invention, N,N-octadecyldimethylallylammonium chloride was purchased from Beijing Yinuokai Technology Co., Ltd. with a specification of 100 g.

[0051] The diethylacrylamide in the present invention is from Shanghai Mairui Biochemical Technology Co., Ltd., with a specification of 100 g.

[0052] Dimethyldiallylammonium chloride in the present invention was purchased from Shanghai Myrrel Biochemical Technology Co., Ltd. with a specification of 100 g.

[0053] The N-isopropylacrylamide in the present invention was purchased from Shanghai Aladdin Biochemical Technology Co., Ltd. with a specification of 500 g.

[0054] TBAOH in the present invention was purchased from Shanghai Aladdin Biochemical Technology Co., Ltd. with a specification of 50 g.

[0055] Trimethylallyl ammonium chloride in the present invention was purchased from Shanghai Aladdin Biochemical Technology Co., Ltd., with a specification of 100 g.

[0056] The N-hydroxymethyl acrylamide in the present invention was purchased from Beijing Yinuokai Technology Co., Ltd., with a specification of 100 g.

[0057] TMAOH in the present invention was purchased from Shanghai Aladdin Biochemical Technology Co., Ltd. with a specification of 50 g.

[0058] Acryloyloxyethyl trimethylammonium chloride in the present invention was purchased from Beijing Yinuokai Technology Co., Ltd., with a specification of 100 g.

[0059] Methacryloyloxyethyl trimethylammonium chloride in the present invention was purchased from Beijing Yinuokai Technology Co., Ltd., with a specification of 100 g.

[0060] Unless otherwise specified, the polytetrafluoroethylene beaker, three-necked flask, constant temperature drying oven and crusher in the present invention are all common commercially available products.

[0061] The present invention uses a thermogravimetric analyzer (Shanghai Aitisen Instrument Technology Co., Ltd., ATS-TGA-1200Q) and a pressurized thickener (Shenyang Aerospace University Application Technology Co., Ltd., double-kettle pressurized thickener).

[0062] The SEM images of the layered tackifier material of the present invention are taken using a scanning electron microscope.

[0063] Example 1

[0064] This embodiment provides a layered adhesion-promoting material.

[0065] The preparation method is as follows:

[0066] 1) Under stirring conditions at a rate of 400 r / min, 2 g of Ti3AlC2 powder was dispersed in a polytetrafluoroethylene beaker containing 40 g of 50 wt% HF, heated to 50°C, and reacted for 48 h; the precipitate was filtered out and added to 20 g of DMSO (50 wt%) aqueous solution, and ultrasonically stripped at a temperature of 25°C for 30 min. After filtration, the filter cake was dried to obtain multilayer Ti3C2.

[0067] 2) 20 g of 2-acrylamido-2-methylpropanesulfonic acid (AMPS), 20 g of N, N-octadecyldimethylallyl ammonium chloride, 10 g of diethylacrylamide and 3 g of the multilayer Ti3C2 obtained in step 1) were dissolved in 200 g of water, and the pH was adjusted to 7 using a 20% mass fraction of sodium hydroxide solution to obtain a mixed solution; the mixed solution was then transferred to a thermostatic three-necked flask, the air in the three-necked flask was extracted with an oil pump, the pressure in the three-necked flask was -0.05 MPa, 0.15 g of ammonium persulfate was added, and the reaction was carried out at a constant temperature of 50 ° C for 5 h. The solid-liquid mixture was placed in a thermostatic drying oven at a temperature of 60 ° C and dried for 24 h, and then crushed to 1200 mesh using a crusher to obtain a layered tackifier material D1. The SEM photograph of D1 is shown in FIG. Figure 1 ,from Figure 1 It can be seen that the layered tackifier D1 has an obvious "accordion" structure, with polymers inserted between layers and an interlayer spacing of approximately 10 nm to 100 nm.

[0068] Example 2

[0069] This embodiment provides a layered adhesion-promoting material.

[0070] The preparation method is as follows:

[0071] 1) Under stirring conditions at a rate of 400 r / min, 6 g of Ti3AlC2 powder was dispersed in a polytetrafluoroethylene beaker containing 30 g of 20 wt% HF, heated to 30°C, and reacted for 12 h. The precipitate was filtered out and added to 10 g of TBAOH (50 wt%) aqueous solution. Ultrasonic stripping was performed at a temperature of 25°C for 30 min. After filtration and drying of the filter cake, multilayer Ti3C2 was obtained.

[0072] 2) 60 g of 2-acrylamido-2-methylpropanesulfonic acid (AMPS), 50 g of dimethyldiallylammonium chloride, 20 g of N-isopropylacrylamide and 5 g of the multilayer Ti3C2 obtained in step 1) were dissolved in 200 g of water, and the pH was adjusted to 7 with a 10% mass fraction of potassium hydroxide solution to obtain a mixed solution, which was then transferred into a thermostatic three-necked flask, and the air in the three-necked flask was extracted with an oil pump. The pressure in the three-necked flask was -0.05 MPa, 0.13 g of ammonium persulfate was added, and the reaction was carried out at a constant temperature of 60 ° C for 2 h. After that, the solid-liquid mixture was placed in a constant temperature drying oven at a temperature of 30 ° C and dried for 24 h, and then crushed to 1200 mesh using a crusher to obtain a layered tackifier material D2.

[0073] Example 3

[0074] This embodiment provides a layered adhesion-promoting material.

[0075] The preparation method is as follows:

[0076] 1) Under stirring conditions at a rate of 400 r / min, 4 g of Ti3AlC2 powder was dispersed in a polytetrafluoroethylene beaker containing 35 g of 30 wt% HF, heated to 60°C, and reacted for 24 h. The precipitate was filtered out and added to 30 g of TMAOH (50 wt%) aqueous solution. Ultrasonic stripping was performed at a temperature of 25°C for 30 min. After filtration and drying of the filter cake, multilayer Ti3C2 was obtained.

[0077] 2) 30 g of 2-acrylamido-2-methylpropanesulfonic acid (AMPS), 30 g of trimethylallyl ammonium chloride, 15 g of N-hydroxymethyl acrylamide and 1 g of the multilayer Ti3C2 obtained in step 1) were dissolved in 200 g of water, and the pH was adjusted to 7 with a 30% mass fraction of sodium hydroxide solution to obtain a mixed solution, which was then transferred into a thermostatic three-necked flask, and the air in the three-necked flask was extracted with an oil pump. The pressure in the three-necked flask was -0.05 MPa, 0.375 g of ammonium persulfate was added, and the reaction was carried out at a constant temperature of 70 ° C for 6 h. After that, the solid-liquid mixture was placed in a constant temperature drying oven at a temperature of 70 ° C and dried for 24 h, and then crushed to 1200 mesh using a crusher to obtain a layered tackifier material D3.

[0078] Example 4

[0079] This embodiment provides a layered adhesion-promoting material.

[0080] The preparation method is as follows:

[0081] 1) Under stirring conditions at a rate of 400 r / min, 3 g of Ti3AlC2 powder was dispersed in a polytetrafluoroethylene beaker containing 40 g of 40 wt% HF, heated to 40°C, and reacted for 36 h. The precipitate was filtered out and added to 15 g of NaOH (50 wt%) aqueous solution. Ultrasonic stripping was performed at a temperature of 25°C for 30 min. After filtration and drying of the filter cake, multilayer Ti3C2 was obtained.

[0082] 2) 40 g of 2-acrylamido-2-methylpropanesulfonic acid (AMPS), 40 g of acryloyloxyethyltrimethylammonium chloride, 10 g of diethylacrylamide and 2 g of the multilayer Ti3C2 obtained in step 1) were dissolved in 200 g of water, and the pH was adjusted to 7 with a 10% mass fraction of potassium hydroxide solution to obtain a mixed solution, which was then transferred into a thermostatic three-necked flask, and the air in the three-necked flask was extracted with an oil pump. The pressure in the three-necked flask was -0.05 MPa, 0.18 g of ammonium persulfate was added, and the reaction was carried out at a constant temperature of 80 ° C for 3 h. The solid-liquid mixture was placed in a constant temperature drying oven at a temperature of 50 ° C and dried for 48 h. The mixture was then crushed to 1200 mesh using a crusher to obtain a layered tackifier material D4.

[0083] Example 5

[0084] This embodiment provides a layered adhesion-promoting material.

[0085] The preparation method is as follows:

[0086] 1) Under stirring conditions at a rate of 400 r / min, 5 g of Ti3AlC2 powder was dispersed in a polytetrafluoroethylene beaker containing 30 g of 50 wt% HF, heated to 50°C, and reacted for 48 h. The precipitate was filtered out and added to 25 g of DMSO (50 wt%) aqueous solution. Ultrasonic stripping was performed at a temperature of 25°C for 30 min. After filtration and drying of the filter cake, multilayer Ti3C2 was obtained.

[0087] 2) 50 g of 2-acrylamido-2-methylpropanesulfonic acid (AMPS), 20 g of methacryloyloxyethyltrimethylammonium chloride, 20 g of N-isopropylacrylamide and 4 g of the multilayer Ti3C2 obtained in step 1) were dissolved in 200 g of water, and the pH was adjusted to 7 with a 20% mass fraction of sodium hydroxide solution to obtain a mixed solution, which was then transferred into a thermostatic three-necked flask, and the air in the three-necked flask was extracted with an oil pump. The pressure in the three-necked flask was -0.05 MPa, 0.36 g of ammonium persulfate was added, and the reaction was carried out at a constant temperature of 50 ° C for 5 h. The solid-liquid mixture was placed in a constant temperature drying oven at a temperature of 40 ° C and dried for 48 h. The mixture was then crushed to 1200 mesh using a crusher to obtain a layered tackifier material D5.

[0088] Example 6

[0089] This embodiment provides a layered adhesion-promoting material.

[0090] The preparation method is as follows:

[0091] 1) Under stirring conditions at a rate of 400 r / min, 2 g of Ti3AlC2 powder was dispersed in a polytetrafluoroethylene beaker containing 35 g of 60 wt% HF, heated to 50°C, and reacted for 48 h. The precipitate was filtered out and added to 25 g of TMAOH (50 wt%) aqueous solution. Ultrasonic stripping was performed at a temperature of 25°C for 30 min. After filtration and drying of the filter cake, multilayer Ti3C2 was obtained.

[0092] 2) 20 g of 2-acrylamido-2-methylpropanesulfonic acid (AMPS), 20 g of N, N-octadecyldimethylallyl ammonium chloride, 15 g of N-hydroxymethyl acrylamide and 3 g of the multilayer Ti3C2 obtained in step 1) were dissolved in 200 g of water, and the pH was adjusted to 7 using a 30% mass fraction of sodium hydroxide solution to obtain a mixed solution, which was then transferred into a thermostatic three-necked flask, and the air in the three-necked flask was extracted with an oil pump. The pressure in the three-necked flask was -0.05 MPa, 0.255 g of ammonium persulfate was added, and the mixture was reacted at a constant temperature of 50 ° C for 5 h. After that, the solid-liquid mixture was placed in a thermostatic drying oven at a temperature of 60 ° C and dried for 48 h. It was then crushed to 1200 mesh using a crusher to obtain a layered tackifier material D6. The SEM photograph of D6 is shown in FIG. Figure 2,from Figure 2 It can be seen that the layered tackifier D6 has an obvious "accordion" structure, with polymers inserted between layers and an interlayer spacing of approximately 10 nm to 100 nm.

[0093] Comparative Example 1

[0094] This comparative example provides a tackifying material.

[0095] The preparation method is as follows:

[0096] 20 g of 2-acrylamido-2-methylpropanesulfonic acid (AMPS), 20 g of N,N-octadecyldimethylallylammonium chloride, and 10 g of diethylacrylamide were dissolved in 200 g of water, and the pH was adjusted to 7 using a 20% by mass sodium hydroxide solution to obtain a mixed solution. The mixed solution was then transferred into a thermostatic three-necked flask, and the air in the flask was evacuated using an oil pump to a pressure of -0.05 MPa. 0.15 g of ammonium persulfate was added, and the mixture was reacted at a constant temperature of 50° C. for 5 h. The solid-liquid mixture was dried in a thermostatic drying oven at 60° C. for 24 h, and then crushed to 1200 mesh using a crusher to obtain a non-layered tackifier material M1.

[0097] Comparative Example 2

[0098] This comparative example provides a layered adhesion-promoting material.

[0099] The preparation method is as follows:

[0100] 1) Under stirring conditions at a rate of 400 r / min, 2 g of Ti3AlC2 powder was dispersed in a polytetrafluoroethylene beaker containing 40 g of 50 wt% HF, heated to 50°C, and reacted for 48 h; the precipitate was filtered out and added to 20 g of DMSO (50 wt%) solution, and ultrasonically stripped at 25°C for 30 min. After filtration, the filter cake was dried to obtain multilayer Ti3C2.

[0101] 2) 70 g of 2-acrylamido-2-methylpropanesulfonic acid (AMPS), 20 g of N, N-octadecyldimethylallylammonium chloride, 10 g of diethylacrylamide and 3 g of the multilayer Ti3C2 obtained in step 1) were dissolved in 200 g of water, and the pH was adjusted to 7 with a 20% mass fraction of sodium hydroxide solution to obtain a mixed solution; the mixed solution was then transferred into a thermostatic three-necked flask, the air in the three-necked flask was extracted with an oil pump, the pressure in the three-necked flask was -0.05 MPa, 0.15 g of ammonium persulfate was added, and the reaction was carried out at a constant temperature of 50°C for 5 h. The solid-liquid mixture was placed in a thermostatic drying oven at 60°C and dried for 24 h, and then crushed to 1200 mesh using a crusher to obtain a layered tackifier material M2.

[0102] Comparative Example 3

[0103] This comparative example provides a layered adhesion-promoting material.

[0104] The preparation method is as follows:

[0105] 1) Under stirring conditions at a rate of 400 r / min, 2 g of Ti3AlC2 powder was dispersed in a polytetrafluoroethylene beaker containing 40 g of 50 wt% HF, heated to 50°C, and reacted for 48 h; the precipitate was filtered out and added to 20 g of DMSO (50 wt%) solution, and ultrasonically stripped at 25°C for 30 min. After filtration, the filter cake was dried to obtain multilayer Ti3C2.

[0106] 2) 100 g of 2-acrylamido-2-methylpropanesulfonic acid (AMPS), 20 g of N,N-octadecyldimethylallylammonium chloride, 10 g of diethylacrylamide and 3 g of the multilayer Ti3C2 obtained in step 1) were dissolved in 200 g of water, and the pH was adjusted to 7 with a 20% mass fraction of sodium hydroxide solution to obtain a mixed solution; the mixed solution was then transferred into a thermostatic three-necked flask, the air in the three-necked flask was extracted with an oil pump, the pressure in the three-necked flask was -0.05 MPa, 0.15 g of ammonium persulfate was added, and the reaction was carried out at a constant temperature of 50°C for 5 h. The solid-liquid mixture was placed in a thermostatic drying oven at 60°C and dried for 24 h, and then crushed to 1200 mesh using a crusher to obtain a layered tackifier material M3.

[0107] Comparative Example 4

[0108] This comparative example provides a layered adhesion-promoting material.

[0109] The preparation method is as follows:

[0110] 1) Under stirring conditions at a rate of 400 r / min, 2 g of Ti3AlC2 powder was dispersed in a polytetrafluoroethylene beaker containing 40 g of 50 wt% HF, heated to 50°C, and reacted for 48 h; the precipitate was filtered out and added to 20 g of DMSO (50 wt%) solution, and ultrasonically stripped at 25°C for 30 min. After filtration, the filter cake was dried to obtain multilayer Ti3C2.

[0111] 2) 20 g of 2-acrylamido-2-methylpropanesulfonic acid (AMPS), 20 g of N, N-octadecyldimethylallylammonium chloride, 30 g of diethylacrylamide and 3 g of the multilayer Ti3C2 obtained in step 1) were dissolved in 200 g of water, and the pH was adjusted to 7 with a 20% mass fraction of sodium hydroxide solution to obtain a mixed solution; the mixed solution was then transferred into a thermostatic three-necked flask, the air in the three-necked flask was extracted with an oil pump, the pressure in the three-necked flask was -0.05 MPa, 0.15 g of ammonium persulfate was added, and the reaction was carried out at a constant temperature of 50°C for 5 h. The solid-liquid mixture was placed in a thermostatic drying oven at 60°C and dried for 24 h, and then crushed to 1200 mesh using a crusher to obtain a layered tackifier material M4.

[0112] Comparative Example 5

[0113] This comparative example provides a layered adhesion-promoting material.

[0114] The preparation method is as follows:

[0115] 1) Under stirring conditions at a rate of 400 r / min, 2 g of Ti3AlC2 powder was dispersed in a polytetrafluoroethylene beaker containing 40 g of 50 wt% HF, heated to 50°C, and reacted for 48 h; the precipitate was filtered out and added to 20 g of DMSO (50 wt%) solution, and ultrasonically stripped at 25°C for 30 min. After filtration, the filter cake was dried to obtain multilayer Ti3C2.

[0116] 2) 20 g of 2-acrylamido-2-methylpropanesulfonic acid (AMPS), 20 g of N, N-octadecyldimethylallyl ammonium chloride, 50 g of diethylacrylamide and 3 g of the multilayer Ti3C2 obtained in step 1) were dissolved in 200 g of water, and the pH was adjusted to 7 with a 20% mass fraction of sodium hydroxide solution to obtain a mixed solution; the mixed solution was then transferred into a thermostatic three-necked flask, the air in the three-necked flask was extracted with an oil pump, the pressure in the three-necked flask was -0.05 MPa, 0.15 g of ammonium persulfate was added, and the reaction was carried out at a constant temperature of 50°C for 5 h. The solid-liquid mixture was placed in a thermostatic drying oven at 60°C and dried for 24 h, and then crushed to 1200 mesh using a crusher to obtain a layered tackifier material M5.

[0117] Comparative Example 6

[0118] This comparative example provides a layered adhesion-promoting material.

[0119] The preparation method is as follows:

[0120] 1) Under stirring conditions at a rate of 400 r / min, 2 g of Ti3AlC2 powder was dispersed in a polytetrafluoroethylene beaker containing 40 g of 50 wt% HF, heated to 50°C, and reacted for 48 h; the precipitate was filtered out and added to 20 g of DMSO (50 wt%) solution, and ultrasonically stripped at 25°C for 30 min. After filtration, the filter cake was dried to obtain multilayer Ti3C2.

[0121] 2) 20 g of 2-acrylamido-2-methylpropanesulfonic acid (AMPS), 20 g of N, N-octadecyldimethylallyl ammonium chloride, 10 g of diethylacrylamide and 6 g of the multilayer Ti3C2 obtained in step 1) were dissolved in 200 g of water, and the pH was adjusted to 7 with a 20% mass fraction of sodium hydroxide solution to obtain a mixed solution; the mixed solution was then transferred into a thermostatic three-necked flask, the air in the three-necked flask was extracted with an oil pump, the pressure in the three-necked flask was -0.05 MPa, 0.15 g of ammonium persulfate was added, and the reaction was carried out at a constant temperature of 50°C for 5 h. The solid-liquid mixture was placed in a thermostatic drying oven at 60°C and dried for 24 h, and then crushed to 1200 mesh using a crusher to obtain a layered tackifier material M6.

[0122] Comparative Example 7

[0123] This comparative example provides a layered adhesion-promoting material.

[0124] The preparation method is as follows:

[0125] 1) Under stirring conditions at a rate of 400 r / min, 2 g of Ti3AlC2 powder was dispersed in a polytetrafluoroethylene beaker containing 40 g of 50 wt% HF, heated to 50°C, and reacted for 48 h; the precipitate was filtered out and added to 20 g of DMSO (50 wt%) solution, and ultrasonically stripped at 25°C for 30 min. After filtration, the filter cake was dried to obtain multilayer Ti3C2.

[0126] 2) 20 g of 2-acrylamido-2-methylpropanesulfonic acid (AMPS), 20 g of N, N-octadecyldimethylallylammonium chloride, 10 g of diethylacrylamide and 0.5 g of the multilayer Ti3C2 obtained in step 1) were dissolved in 200 g of water, and the pH was adjusted to 7 with a 20% mass fraction of sodium hydroxide solution to obtain a mixed solution; the mixed solution was then transferred to a thermostatic three-necked flask, the air in the three-necked flask was extracted with an oil pump, the pressure in the three-necked flask was -0.05 MPa, 0.15 g of ammonium persulfate was added, and the reaction was carried out at a constant temperature of 50° C. for 5 h. The solid-liquid mixture was placed in a thermostatic drying oven at 60° C. and dried for 24 h, and then crushed to 1200 mesh using a crusher to obtain a layered tackifier material M7.

[0127] In order to further illustrate the performance of the layered tackifiers D1 to D6 prepared in Examples 1 to 6 of the present invention and the tackifiers M1 to M7 prepared in Comparative Examples 1 to 7, the following tests were performed.

[0128] (1) The layered tackifiers D1 to D6 prepared in Examples 1 to 6 of the present invention and the tackifiers M1 to M7 prepared in Comparative Examples 1 to 7 were subjected to a thermogravimetric analyzer ATS-TGA-1200Q produced by Shanghai Aitisen Instrument Technology Co., Ltd. The samples were heated from room temperature to 250° C. at a heating rate of 10° C. / min under a nitrogen atmosphere. The test environment was consistent, and the thermogravimetric curves of the layered tackifiers D1 to D6 prepared in Examples 1 to 6 of the present invention and the tackifiers M1 to M7 prepared in Comparative Examples 1 to 7 were recorded as follows: Figure 3 and Figure 4 .

[0129] from Figure 3 As can be seen from the graph, the layered tackifiers D1 to D6 prepared in Examples 1 to 6 of the present invention gradually decompose with increasing temperature, and all show significant weight loss. Taking D1 as an example, when the temperature rises to 100°C, the mass fraction of the tackifier begins to decrease, indicating that decomposition and weight loss have begun. As the temperature continues to rise, the tackifier material gradually escapes from the layered material and decomposes. When the temperature rises to 250°C, 70% of the mass of the layered tackifier remains undecomposed, indicating that the layered tackifier has good high temperature resistance.

[0130] from Figure 4 It can be seen that the layered tackifiers M1 to M7 prepared in Comparative Examples 1-7 of the present invention, among which M1 has a very low temperature at which the tackifier begins to decompose because no layered material is added, and it begins to decompose at 75°C until 35% of the mass remains undecomposed; in M2 to M7, the monomer ratio is not optimal or the monomer ratio exceeds or is lower than the mass ratio range specified in the present invention, and the temperature resistance is reduced. When the temperature rises to 250°C, the tackifier does not decompose and the mass is less than 60%.

[0131] (2) Cement slurry preparation

[0132] Based on the mass of the dry powder of oil well cement, the solid phase and liquid phase to be added were weighed and the cement slurry was prepared according to the API standard (American Petroleum Institute). The solid phase and the liquid phase were mixed evenly before preparation. The weighed liquid phase was poured into the mixer and the speed was set to 4000 r / min. -1 Pour the weighed solid phase into the mixer within 15 seconds and then adjust the mixer speed to 12000 r / min. -1 , continue stirring for 35s.

[0133] 1. Sedimentation stability test

[0134] First, set the target temperature of the pressurized viscosifier to 210°C, the target pressure to 90 MPa, and the heating time to 90 minutes. Immediately place the prepared cement slurry (C1-C11) into the pressurized viscosifier's kettle. Once the temperature and pressure reach the target values, continue stirring the slurry at the set temperature and pressure for 30 minutes. Slowly release the pressure. Once the temperature drops to 90°C, remove the slurry cup from the viscosifier and remove any residual oil from the upper layer of the slurry using a syringe or paper towel. Then, use a densitometer to measure the density of the upper, middle, and lower portions of the slurry cup.

[0135] Test Example 1

[0136] Density is 2.5g / cm 3 The cement slurry formula is: G-grade cement + 90wt% silica fume + 345wt% iron powder + 10wt% polycarboxylic acid high-temperature retarder + 18wt% AMPS high-temperature fluid loss additive + 1wt% modified wood sulfonate dispersant + 1wt% tributyl ester defoamer + 120wt% water, where the density of the iron powder is 6.0g / cm 3 , the system is C1 (in this system, based on the mass of grade G cement as 100%, the amount of silica fume added is 90% of the mass of grade G cement, the amount of iron powder added is 345% of the mass of grade G cement, the amount of polycarboxylic acid high-temperature retarder added is 10% of the mass of grade G cement, the amount of AMPS high-temperature fluid loss additive added is 18% of the mass of grade G cement, the amount of modified wood sulfonate dispersant added is 1% of the mass of grade G cement, the amount of tributyl ester defoamer added is 1% of the mass of grade G cement, and the amount of water added is 120% of the mass of grade G cement. The component selection in the cement slurry formula in the following test examples 2-15 is the same as that in test example 1).

[0137] Test Example 2

[0138] Density is 2.5g / cm 3 The cement slurry formula is: G-grade cement + 90wt% silica fume + 345wt% iron powder + 10wt% high-temperature retarder + 18wt% high-temperature fluid loss additive + 1wt% dispersant + 1wt% defoamer + 3wt% layered viscosity enhancer D1 + 120wt% water, where the density of the iron powder is 6.0g / cm 3 , the system is C2.

[0139] Test Example 3

[0140] Density is 2.5g / cm 3 The cement slurry formula is: G-grade cement + 90wt% silica fume + 345wt% iron powder + 10wt% high-temperature retarder + 18wt% high-temperature fluid loss additive + 1wt% dispersant + 1wt% defoamer + 4wt% layered viscosity enhancer D2 + 120wt% water, where the density of the iron powder is 6.0g / cm 3 , the system is C3.

[0141] Test Example 4

[0142] Density is 2.5g / cm 3 The cement slurry formula is: G-grade cement + 90wt% silica fume + 345wt% iron powder + 10wt% high-temperature retarder + 18wt% high-temperature fluid loss additive + 1wt% dispersant + 1wt% defoamer + 5wt% layered viscosity enhancer D3 + 120wt% water, where the density of the iron powder is 6.0g / cm 3 , the system is C4.

[0143] Test Example 5

[0144] Density is 2.5g / cm 3 The cement slurry formula is: G-grade cement + 90wt% silica fume + 345wt% iron powder + 10wt% high-temperature retarder + 18wt% high-temperature fluid loss additive + 1wt% dispersant + 1wt% defoamer + 6wt% layered viscosity enhancer D4 + 120wt% water, where the density of the iron powder is 6.0g / cm 3 , the system is C5.

[0145] Test Example 6

[0146] Density is 2.5g / cm 3 The cement slurry formula is: G-grade cement + 90wt% silica fume + 345wt% iron powder + 10wt% high-temperature retarder + 18wt% high-temperature fluid loss additive + 1wt% dispersant + 1wt% defoamer + 7wt% layered viscosity enhancer D5 + 120wt% water, where the density of the iron powder is 6.0g / cm 3 , the system is C6.

[0147] Test Example 7

[0148] Density is 2.5g / cm 3 The cement slurry formula is: G-grade cement + 90wt% silica fume + 345wt% iron powder + 10wt% high-temperature retarder + 18wt% high-temperature fluid loss additive + 1wt% dispersant + 1wt% defoamer + 8wt% layered viscosity enhancer D6 + 120wt% water, where the density of the iron powder is 6.0g / cm 3 , the system is C7.

[0149] Test Example 8

[0150] Density is 2.2g / cm 3 The cement slurry formula is: G-grade cement + 90wt% silica fume + 300wt% iron powder + 10wt% high-temperature retarder + 18wt% high-temperature fluid loss additive + 1wt% dispersant + 1wt% defoamer + 3wt% layered viscosity enhancer D1 + 120wt% water, where the density of the iron powder is 6.0g / cm3 , the system is C8.

[0151] Test Example 9

[0152] Density is 2.5g / cm 3 The cement slurry formula is: G-grade cement + 90wt% silica fume + 345wt% iron powder + 10wt% high-temperature retarder + 18wt% high-temperature fluid loss additive + 1wt% dispersant + 1wt% defoamer + 3wt% viscosity enhancer M1 + 120wt% water, where the density of iron powder is 6.0g / cm 3 , the system is C9.

[0153] Test Example 10

[0154] Density is 2.5g / cm 3 The cement slurry formula is: G-grade cement + 90wt% silica fume + 345wt% iron powder + 10wt% high-temperature retarder + 18wt% high-temperature fluid loss additive + 1wt% dispersant + 1wt% defoamer + 5wt% layered viscosity enhancer M2 + 120wt% water, where the density of the iron powder is 6.0g / cm 3 , the system is C10.

[0155] Test Example 11

[0156] Density is 2.5g / cm 3 The cement slurry formula is: G-grade cement + 90wt% silica fume + 345wt% iron powder + 10wt% high-temperature retarder + 18wt% high-temperature fluid loss additive + 1wt% dispersant + 1wt% defoamer + 8wt% layered viscosity enhancer M3 + 120wt% water, where the density of the iron powder is 6.0g / cm 3 , the system is C11.

[0157] Test Example 12

[0158] Density is 2.5g / cm 3 The cement slurry formula is: G-grade cement + 90wt% silica fume + 345wt% iron powder + 10wt% high-temperature retarder + 18wt% high-temperature fluid loss additive + 1wt% dispersant + 1wt% defoamer + 8wt% layered viscosity enhancer M4 + 120wt% water, where the density of the iron powder is 6.0g / cm 3 , the system is C12.

[0159] Test Example 13

[0160] Density is 2.5g / cm 3The cement slurry formula is: G-grade cement + 90wt% silica fume + 345wt% iron powder + 10wt% high-temperature retarder + 18wt% high-temperature fluid loss additive + 1wt% dispersant + 1wt% defoamer + 8wt% layered viscosity enhancer M5 + 120wt% water, where the density of the iron powder is 6.0g / cm 3 , the system is C13.

[0161] Test Example 14

[0162] Density is 2.5g / cm 3 The cement slurry formula is: G-grade cement + 90wt% silica fume + 345wt% iron powder + 10wt% high-temperature retarder + 18wt% high-temperature fluid loss additive + 1wt% dispersant + 1wt% defoamer + 8wt% layered viscosity enhancer M6 + 120wt% water, where the density of the iron powder is 6.0g / cm 3 , the system is C14.

[0163] Test Example 15

[0164] Density is 2.5g / cm 3 The cement slurry formula is: G-grade cement + 90wt% silica fume + 345wt% iron powder + 10wt% high-temperature retarder + 18wt% high-temperature fluid loss additive + 1wt% dispersant + 1wt% defoamer + 8wt% layered viscosity enhancer M7 + 120% water, where the density of the iron powder is 6.0g / cm 3 , the system is C15.

[0165] Table 1 Test results of cement slurry properties described in Test Examples 1-15

[0166]

[0167]

[0168] It can be seen from the results in Table 1 that when the layered tackifier prepared by the present invention is not added (C1), the density is 2.5 g / cm 3 The cement slurry settled seriously after high temperature curing, and the density difference between the upper and lower parts reached 0.4g / cm 3 The layered tackifiers D1 to D6 prepared in Examples 1-6 of the present invention were added to a high-density cement slurry system (density range 2.2 g / cm 3 ~2.5g / cm 3 ), the addition amount is 3% to 8% of the total mass of cement. After curing, the cement slurry is left to stand for two hours and the density difference is less than 0.03g / cm 3 , no settlement occurs, good stability;

[0169] However, when the viscosity enhancers M1 to M7 prepared in Comparative Examples 1 to 7 of the present invention were added to the high-density cement slurry system under the same conditions, the density difference between the upper and lower densities of the cement slurry after curing and standing for two hours was greater than 0.03 g / cm 3 , it is prone to settlement and its stability is obviously poor.

[0170] 2. Thickening curve test

[0171] The cement slurry preparation complies with the API standard (American Petroleum Institute), with the target temperature of the pressurized viscometer being 210°C, the target pressure being 90 MPa, and the heating time being 90 min.

[0172] Cement slurry thickening performance testing was conducted in accordance with the test requirements of GB / T 19139-2012, "Test Methods for Oil Well Cement." The prepared cement slurry was poured into the cylindrical rotating slurry cup of the pressurized viscometer. After ensuring a tight seal, the target temperature and pressure were set. During the test, the slurry cup rotated at 150 (±15) r / min, and the instrument measured its torque to generate the cement slurry's consistency curve.

[0173] The thickening curves of the layered tackifier D1 prepared in Example 1 of the present invention with and without addition are shown in FIG. Figure 5 and Figure 6 As shown, the thickening curve of the cement slurry system (C1) without the layered tackifier D1 prepared in Example 1 decreased significantly, and the consistency decreased significantly, from the initial 36Bc to gradually decreased to 5Bc; while the thickening curve of the cement slurry system (C2) with the layered tackifier D1 prepared in Example 1 was stable, and the consistency did not change much with increasing temperature.

[0174] The thickening curve of the layered tackifier M1 prepared in Comparative Example 1 of the present invention is as follows: Figure 7 As shown, the cement slurry system (C9) to which the viscosity enhancer M1 prepared in Comparative Example 1 was added has a large initial consistency, indicating that the absence of layered materials easily increases the viscosity of the slurry. Secondly, after heating to 210°C, the viscosity of the cement slurry system decreases rapidly, indicating that the viscosity enhancer has poor thermal stability and quickly decomposes and loses its viscosity-enhancing effect.

[0175] It should be noted that the embodiments described above are only used to explain the present invention and do not constitute any limitation of the present invention. The present invention has been described with reference to typical embodiments, but it should be understood that the words used therein are descriptive and explanatory words, rather than restrictive words. The present invention may be modified as specified within the scope of the claims of the present invention, and the present invention may be revised without departing from the scope and spirit of the present invention. Although the present invention described therein relates to specific methods, materials and embodiments, it does not mean that the present invention is limited to the specific examples disclosed therein. On the contrary, the present invention can be extended to all other methods and applications with the same function.

Claims

1. A layered tackifier, characterized in that: The invention comprises a layered material and a viscosity-increasing material, wherein the layered material is selected from two-dimensional transition metal carbides, and the raw materials for preparing the viscosity-increasing material include 2-acrylamido-2-methylpropanesulfonic acid, a quaternary ammonium salt monomer and a thermal viscosity-increasing monomer; The mass ratio of the 2-acrylamido-2-methylpropanesulfonic acid, the quaternary ammonium salt monomer, the thermal tackifying monomer and the layered material is (20-60): (20-50): (10-20): (1-5); The two-dimensional transition metal carbide is at least one selected from niobium carbide, vanadium carbide, molybdenum carbide and titanium carbide; The interlayer spacing of the two-dimensional transition metal carbide is 10nm to 100nm; The layered material is obtained by etching the MAX phase; the MAX phase is selected from Ti3AlC2; The etching includes first reacting the MAX phase with an etchant II, and then mixing it with a stripper solution to perform stripping; The mass ratio of the MAX phase, the etchant, and the stripper is (1-3): (15-20): (5-15); The concentration of the etchant is 20 wt% to 60 wt%; the etchant is selected from at least one of HF, LiF, and HCl; The concentration of the stripping agent solution is 20wt% to 60wt%; the stripping agent is selected from at least one of dimethyl sulfoxide, tetrabutylammonium hydroxide, tetramethylammonium hydroxide, and sodium hydroxide; The conditions of the reaction II include: temperature of 30°C to 60°C, time of 12h to 48h; The peeling conditions include: temperature of 20° C. to 25° C., and time of 30 minutes.

2. The layered tackifier according to claim 1, characterized in that The interlayer spacing of the two-dimensional transition metal carbide is 50nm to 100nm.

3. The layered tackifier according to claim 1, characterized in that The quaternary ammonium salt monomer is selected from at least one of dimethyldiallylammonium chloride, trimethylallylammonium chloride, acryloyloxyethyltrimethylammonium chloride, methacryloyloxyethyltrimethylammonium chloride, and N,N-octadecyldimethylallylammonium chloride; And / or, the thermal tackifying monomer is at least one selected from diethyl acrylamide, N-isopropyl acrylamide, and N-hydroxymethyl acrylamide.

4. The layered tackifier according to claim 1, characterized in that The stripping process also includes filtering and drying.

5. A method for preparing a layered tackifier according to any one of claims 1 to 4, characterized in that: The method comprises mixing 2-acrylamido-2-methylpropanesulfonic acid, a quaternary ammonium salt monomer, a thermal tackifying monomer and a layered material in water to obtain a mixed liquid, and performing a reaction I on the mixed liquid to obtain the layered tackifier.

6. The preparation method according to claim 5, characterized in that The mass ratio of the total mass of the 2-acrylamido-2-methylpropanesulfonic acid, the quaternary ammonium salt monomer, the thermal tackifying monomer and the layered material to water is (53-135):200; And / or, the pH of the mixed solution is adjusted to 7.

7. The preparation method according to claim 6, characterized in that The pH regulator of the mixed solution is selected from at least one of a sodium hydroxide solution and a potassium hydroxide solution with a mass fraction of 10% to 30%.

8. The preparation method according to any one of claims 5 to 7, characterized in that In the reaction I, an initiator is also added.

9. The preparation method according to claim 8, characterized in that The added amount of the initiator is 0.1% to 0.5% of the total mass of the 2-acrylamido-2-methylpropanesulfonic acid, the quaternary ammonium salt monomer and the thermal adhesion-increasing monomer.

10. The preparation method according to claim 8, characterized in that The initiator is selected from at least one of ammonium persulfate and potassium persulfate.

11. The preparation method according to any one of claims 5 to 7, characterized in that: The conditions of the reaction I include: temperature of 50°C to 80°C, time of 2h to 6h, and pressure of -0.05MPa; And / or, the reaction I further includes drying and crushing.

12. The preparation method according to claim 11, characterized in that The drying conditions include: a temperature of 30° C. to 70° C. and a drying time of 24 hours to 48 hours.

13. Use of the layered tackifier according to any one of claims 1 to 4 or the layered tackifier prepared by the preparation method according to any one of claims 5 to 12 in cementing slurry.

14. The use according to claim 13, characterized in that The amount of the layered tackifier added to the cementing slurry is 3 wt% to 8 wt% based on cement.

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