Hydrophobic association polymer containing capsaicin active monomer and preparation method thereof

Abstract

The invention relates to a hydrophobic associated polymer containing a capsaicin activated monomer and a preparation method thereof. The method comprises the following step: by taking an acrylamide monomer containing capsaicin activity as a hydrophobic monomer, carrying out polymerization reaction on the acrylamide monomer and acrylamide and (methyl) crylic acid under initiation of a water-soluble initiator when in preparation, wherein the weight part ratio of the acrylamide monomer containing capsaicin activity to the acrylamide to the (methyl) crylic acid is (1-20) to (60-90) to (9-20), the reaction temperature is 30-80 DEG C, and the reaction time is 2-20 hours. The hydrophobic associated polymer macromolecule disclosed by the invention simultaneously contains a carboxyl group and a hydrophobic unit containing capsaicin activity with a rigid benzene ring structure, displays good viscosifying capacity, solubleness, salt resistant and temperature-resistance, and antimicrobial properties, is low in price, and can be used as a novel oil-displacing agent to be applied in tertiary oil recovery of an oil field.

Description

【Technical field】 [0001] The invention belongs to the field of polymer materials. More specifically, the present invention relates to a hydrophobic association polymer containing capsaicin active monomer and a preparation method thereof. 【Background technique】 [0002] Petroleum is an important energy and chemical raw material. With the rapid development of the world economy, people's demand for petroleum continues to increase, while its reserves continue to decrease. Petroleum, as a non-renewable resource, is becoming more and more valuable. However, at present, major oil fields such as Daqing in my country have entered into the post-exploitation period with high water cut, and about 60% of the crude oil in the reservoir cannot be recovered by conventional oil recovery technology, which restricts the development of the national economy. In order to stabilize oilfield production in my country, the use of tertiary oil recovery technology to increase oil recovery has become a...

AI Technical Summary

Problems solved by technology

At this stage, the two most commonly used polymers in oilfields are partially hydrolyzed polyacrylamide (HPAM) and xanthan gum, which have achieved good results in most blocks of the oilfield. There are insurmountable problems: HPAM relies on high molecular weight and molecular chain—COO - The electrostatic repulsion makes the molecular chain stretch, so as to achieve the effect of thickening, but under the conditions of high temperature, high salt, high shear, etc., HPAM is easy to hydrolyze, degrade, chain curling, etc., resulting in a sudden change in the performance of the solution and failing to achieve engineering construction. Although xanthan gum has good salt resistance, its thermal stability and biological stability are poor, it is easy to degrade and block the oil layer, and the cost is high

In 2004, Zhang Xi et al. synthesized the non-ionic hydrophobic association polymer PBAM by free radical micellar polymerization, and found that due to the existence of surfactant micelles during the polymerization process, the intercalation rate of hydrophobic monomers at the initial stage of the reaction It is very high, and the later stage is mainly based on acrylamide homopolymer, resulting in serious microstructure heterogeneity, which has a great impact on the viscosity-increasing performance of the copolymer

For example, most domestic oil fields have entered or are about to enter a high water cut period or encounter high salinity water, the viscosity of HAWP will drop sharply, or even precipitate, which will affect its application range

In addition, with the deepening of domestic oil exploitation, the temperature in the oil well is higher, and the temperature resistance of the polymer needs to be strengthened

Thirdly, during the oil recovery process, bacteria such as sulfate reducing bacteria and saprophytic bacteria may adhere to the pipeline wall for a long time and contact with the continuously injected HAWP, which greatly improves the ability of the bacteria to decompose the polymer, and makes the viscosity loss of the polymer solution smaller. large, resulting in reduced oil displacement efficiency

In addition, the synthesis process of most modified hydrophobic monomers is cumbersome and expensive, and their large-scale application has no practical significance in oilfield production.

Therefore, it remains a formidable challenge to develop well-performing, inexpensive hydrophobically-associated polymers.

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