Polymer clay stabilizer containing Beta-cyclodextrin structure and synthesis method thereof

Abstract

The invention relates to a polymer clay stabilizer containing Beta-cyclodextrin structure and a synthesis method thereof, wherein the polymer clay stabilizer is used for restraining clay hydration swelling of an oil well. The technical scheme is as follows: the polymer clay stabilizer comprises the following materials and monomers in percentage by mass: 35-54.8% of acrylamide AM, 15-25% of sodium acrylate NaAA, 8-20% of 2-acryloyl-methyl-propyl sulfonate AMPS, and 0.2% of 2-O (propenyloxy-2-hydroxy-propyl)-Beta-cyclodextrin XBH; 0.02g of XBH and 2g of AMPS are added into a flask, and then 5.48g AM, 1.915g of AA and 0.585 g of NaOH are added into the flask, so a water solution with the monomer mass percentage concentration of 20% is prepared, and nitrogen is introduced into the water solution for 20 min; (NH4)2S2O8 solution and NaHSO3 solution are then added into the water solution while nitrogen is continuously introduced into the water solution for 10-20 min, and reaction is carried out at the temperature of 35 DEG C for 4-12 hours; and finally, the reacted solution is subjected to washing with absolute ethyl alcohol, smashing and drying to obtain AM / NaAA / AMPS / XBH quaternary polymer. The polymer clay stabilizer has good water solubility, viscosifying capacity, temperature resistance, salt resistance, anti-shearing capacity and clay-swelling restraining capacity, and reaches the swelling prevention rate of 84.37% towards sodium-montmorillonite.

Description

technical field [0001] The invention relates to a polymer clay stabilizer used in petroleum industry to suppress clay expansion in oil wells and a synthesis method thereof. Background technique [0002] Clay minerals widely exist in oil reservoirs, and 97% of the oil reservoirs in the world contain clay minerals to varying degrees. If improper measures are taken during the development process, it will cause hydration expansion, dispersion and migration of clay minerals, which will block the throat of the pore structure of the formation, reduce the permeability of the formation, and cause formation damage . Therefore, for reservoirs with high clay content and strong water sensitivity, in any technological measures such as drilling, cementing, water injection, fracturing, acidizing, workover and killing, as long as there is invasion of water-based working fluid, there will be May cause water sensitive injury. Therefore, the use of clay stabilizer (Clay stabilizer) has becom...

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Problems solved by technology

Among them, inorganic salt clay stabilizers have a wide supply, low price, and are easy to use and maintain, but they can only temporarily stabilize clay particles and are not resistant to erosion, and this type of clay stabilizer cannot produce multi-point adsorption, such as: KCl, NaCl, CaCl 2 etc. (Boek, E.S et al. Monte carlo molecular modeling studies of hydrated Li + , Na + , and K + Smectites: Understanding the Role of Potassium as a Clay Swelling Inhibitor. J. Am. Chem. Soc., 1995, 117 (50): 12608–12617; Research on the Effect of Spacing. Rock and Soil Mechanics. 2011, 32(1): 137-140)

The advantages of inorganic cationic clay stabilizers are strong adsorption and resistance to water washing, but the disadvantage is that the formation will become lipophilic (Ye Jian et al. Development of clay stabilizers for low-permeability oilfields. Daqing Petroleum Geology and Development. 2007, 26 (4 ):92-95)

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