Synthesis method of quaternary copolymerized salt-resistant and temperature-resistant polyacrylamide

Abstract

The invention discloses a synthesis method of quaternary copolymerized salt-resistant and temperature-resistant polyacrylamide. The synthesis method comprises the following steps: firstly, adding acrylamide, a salt-resistant functional monomer, a temperature-resistant functional monomer, a pH buffering monomer and deionized water into a reaction device to prepare a mixed aqueous monomer solution,adjusting the pH value to be 5 to 8, inflating nitrogen to remove oxygen, and adding azodiisobutylimidazoline hydrochloride; after the oxygen content is lower than 0.1mg/L, controlling the temperatureto be at 0-8 DEG C, and reacting for 4-8 hours in a sealed state; then, crushing colloid, mixing with a hydrolyzing agent, preserving heat at 60-80 DEG C, reacting for 4-8 hours, drying and crushingto obtain a finished product. The synthesis method has the advantages as follows: the synthesis method is simple, and the synthesized finished product changes a single molecular structure of the conventional polyacrylamide; the functional monomers are introduced into a main chain to generate special functional groups, so that the sensitivity of the polyacrylamide to salt and the temperature is reduced, therefore, the salt resistance and the temperature resistance of the polyacrylamide are greatly improved, and the quaternary copolymerized salt-resistant and temperature-resistant polyacrylamidecan be better applied to tertiary oil recovery of a high-salt and high-temperature reservoir of an oilfield; moreover, sewage can be used for preparing the quaternary copolymerized salt-resistant andtemperature-resistant polyacrylamide, so that the oil recovery cost is effectively reduced.

Description

technical field [0001] The invention relates to the field of functional polymers, in particular to a method for synthesizing a quaternary copolymerized salt-resistant and temperature-resistant polyacrylamide. Background technique [0002] With the development of the world economy and industry, the human demand for oil is also increasing. Due to the intensive exploitation of oil in a large area in recent decades, the oilfield blocks with good reservoir geological conditions and low exploitation cost are close to depletion, and most of the remaining oilfields are blocks with poor exploitation conditions or high exploitation cost. At present, because new energy cannot completely replace traditional energy, some oilfields with high reservoir temperature and high formation salinity are difficult to exploit (such as the reservoir temperature in some blocks in Northern Europe and the Middle East reaches 90-120℃, formation water ore 100,000-300,000 mg / L, and 5,000-15,000 mg / L of hi...

AI Technical Summary

Problems solved by technology

However, the traditional polyacrylamide oil displacement agent is easy to degrade and decompose rapidly under high temperature and high salt conditions, and cannot achieve the purpose of effective oil displacement, or even completely ineffective displacement. Therefore, a new type of flooding agent suitable for this type of oil reservoir is developed Oil is very necessary