CN-119409906-B - Integrated viscosity-changing polymer thickener and preparation method thereof

Abstract

The invention provides an integrated viscosity-changing polymer thickener and a preparation method thereof, and the thickener specifically comprises the following raw materials: acrylamide, N-benzyl-N-methacryloxy-N, N-dimethylamino ammonium chloride, behenyl polyoxyethylene ether methacrylate, azo diisobutylamidine hydrochloride and solvent deionized water. The thickener prepared by the invention has good thickening effect, high temperature resistance, shearing resistance and salt resistance, is used as a drag reducer at low concentration, and is used as a thickener at high concentration. The thickener prepared by the invention can be operated under the conditions of high temperature and high mineralization, and has good compatibility with stratum. The invention obtains the polymer with larger relative molecular mass, higher cation degree and good stability. The equipment prepared by the method has the advantages of simple process, relatively low price, easy operation, less pollution and easy industrial production.

Inventors

• TIAN YU
• YANG LIN
• ZHENG HAOXUAN
• ZHANG JIN
• WU AOHUI
• LI YUANZHE
• CHEN JUNYAO
• An Fengtao

Assignees

• 陕西科技大学

Dates

Publication Date

20260512

Application Date

20241120

Claims (2)

1. 1. A preparation method of an integrated viscosity-changing polymer thickener is characterized in that, The method comprises the following steps: Firstly, weighing raw materials including acrylamide, N-benzyl-N-methacryloxy-N, N-dimethylamino ammonium chloride, docosa-alkyl polyoxyethylene ether methacrylate, azo diisobutylamidine hydrochloride and a solvent; Uniformly mixing acrylamide, N-benzyl-N-methacryloyloxy-N, N-dimethylamino ammonium chloride and docosa-alkyl polyoxyethylene ether methacrylate in a solvent, pouring into a reaction kettle, introducing nitrogen, and slowly heating after half an hour; step three, after the reaction is stable, azo diisobutylamidine hydrochloride is dripped into the reaction liquid at a constant speed to serve as an initiator, the reaction temperature is controlled, and the reaction is continued for 4-9 hours after the titration is finished, so that a colorless transparent jelly can be obtained; washing the colorless transparent jelly with absolute ethyl alcohol, shearing, and drying to obtain white powder, namely a thickening agent; the thickener comprises the following raw material components: Acrylamide, N-benzyl-N-methacryloxy-N, N-dimethylamino ammonium chloride, behenyl polyoxyethylene ether methacrylate, azobisisobutylamidine hydrochloride, and a solvent; The solvent is deionized water; In the first step, the raw materials are calculated according to the mass parts as follows: 3-10 parts of acrylamide; 0.5-1 part of N-benzyl-N-methacryloyloxy-N, N-dimethylamino ammonium chloride; 0.5-1 part of behenyl polyoxyethylene ether methacrylate; 0.05-0.3 part of azodiisobutylamidine hydrochloride; 60-90 parts of solvent.
2. 2. The method for preparing an integrated viscosity-changing polymer thickener according to claim 1, wherein in the third step, the reaction temperature is 45-75 ℃.

Description

Integrated viscosity-changing polymer thickener and preparation method thereof Technical Field The invention relates to the field of oilfield chemicals, in particular to an integrated viscosity-changing polymer thickener and a preparation method thereof. Background With the continuous increase of global oil and gas resource demands, oil and gas exploration and development technologies are continuously advanced to cope with the challenges of high porosity and high permeability of high quality oil and gas resources. During long term production, most high quality oil and gas fields have gradually entered the later stages of production, and therefore, the development of unconventional reservoirs has become the current focus. Such reservoirs often have complex stratum environments and poor permeability, and have higher requirements on exploration and development technologies. Effective formation modification is particularly critical to enhance formation permeability and increase hydrocarbon production, wherein hydraulic fracturing has received significant attention as an important means for low permeability reservoir modification. Hydraulic fracturing technology injects high mucus bodies into the bottom of the well through the high pressure generated by the fracturing truck, breaking the formation and forming new fractures. These cracks are effectively supported by propping agents, so that the permeability of the stratum is remarkably improved, oil gas is easier to infiltrate into a shaft through the cracks, and the oil well yield and the reservoir utilization rate are effectively improved. In this process, the fracturing fluid is the key element, which is mainly responsible for making the joint and delivering the propping agent, and its performance has a decisive influence on the fracturing effect. The fracturing fluid is mainly divided into three types of water-based fracturing fluid, oil-based fracturing fluid and foam-based fracturing fluid, wherein the water-based fracturing fluid is widely applied to various large oil fields due to the advantages of high safety, low cost, simple and convenient working procedures and the like. In water-based fracturing fluids, the thickener is used as a main agent and plays a decisive role in the performance of the fracturing fluid system. However, the thickener in the prior art still has a plurality of defects in application scenes. The natural vegetable gum type fracturing fluid system has more residues after gel breaking, causes great damage to the physical properties of the original stratum, has no residues after gel breaking, has poor temperature resistance and high price, limits the application of the natural vegetable gum type fracturing fluid system, and has the advantages that the polymer type fracturing fluid system can be obtained through chemical crosslinking or physical crosslinking, but the shearing resistance of the system can be reduced through a chemical crosslinking mode, and the friction resistance is high in the pumping process, so that the construction effect is influenced. In contrast, the super-molecular hydrophobic association polymer fracturing fluid system obtained by the physical crosslinking method has excellent shear recovery performance and viscoelastic performance, and low residue content after gel breaking, but still needs further research and development to optimize the performance and meet wider fracturing construction requirements. In summary, although the thickener in the prior art has certain advantages in application scenarios, there are many drawbacks and disadvantages, such as a large amount of residues, poor temperature resistance, low shear resistance, and high friction resistance, and the development of a novel thickener is needed to overcome the above-mentioned drawbacks. Disclosure of Invention The invention aims to provide an integrated viscosity-changing polymer thickener and a preparation method thereof, In order to achieve the above purpose, the technical scheme of the invention is as follows: The invention provides an integrated viscosity-changing polymer thickener, which comprises the following raw material components in parts by weight: Acrylamide (AM), N-benzyl-N-methacryloxy-N, N-dimethylamino ammonium chloride (MTC), behenyl polyoxyethylene ether methacrylate (BEM), azo-bis-isobutyramidine hydrochloride, and solvent. The raw materials are calculated according to the mass parts as follows: 3-10 parts of Acrylamide (AM); 0.5-1 part of N-benzyl-N-methacryloyloxy-N, N-dimethylamino ammonium chloride (MTC); 0.5-1 part of behenyl polyoxyethylene ether methacrylate (BEM); 0.05-0.3 part of azodiisobutylamidine hydrochloride (V50); 60-90 parts of solvent. The solvent is deionized water. The preparation method of the integrated viscosity-changing polymer thickener comprises the following steps: Firstly, weighing raw materials including acrylamide, N-benzyl-N-methacryloxy-N, N-dimethylamino ammonium chloride, docosa-alkyl polyoxye