Expandable selective long-acting water plugging agent and preparation method thereof

Abstract

The invention discloses an expandable selective long-acting water plugging agent and a preparation method thereof. The expandable selective long-acting water plugging agent comprises a component A anda component B, wherein the component A is a polyurethane prepolymer, and accounts for 60-85% of the total mass of the raw materials of the water plugging agent, the component B is a mixed solution formed by mixing 1-20% of a hydrophilic functional monomer, 1-10% of a hydrophilic nano material, 0.01-1% of an initiator, 0.01-5% of a catalyst, 1-10% of a chain extender and water, the content of eachraw material in the component B is the proportion of a single agent in the total mass of the raw materials of the water plugging agent, and the water plugging agent is prepared by mixing the component A and the component B, and polymerizing the polyurethane prepolymer, the hydrophilic functional monomer and the hydrophilic nano material under the combined action of the initiator, the catalyst andthe chain extender. According to the invention, the hydrophilic functional monomer and the hydrophilic nano material are introduced into the traditional polyurethane material, so that the water swelling property, the stability and the plugging capability of the water plugging agent are enhanced, and the water plugging agent has the characteristics of water plugging and no oil plugging, and is suitable for water plugging operation of an oil-water well in a high-water-content block.

Description

technical field [0001] The invention relates to the technical field of oilfield development, in particular to an expandable selective long-acting water shutoff agent and a preparation method thereof. Background technique [0002] Water production from oil wells is a common phenomenon encountered in the middle and late stages of oilfield development, especially in water flooding oilfields. Water output from oil wells will not only reduce production and accelerate equipment corrosion, but also cause damage to the original structure of the formation, aggravate sand production in oil wells, increase the amount of sewage treatment, and slow down the progress of oilfield exploitation. At present, the water shutoff methods in oil fields are mainly mechanical water shutoff method and chemical water shutoff method. Chemical water plugging is currently the most researched and most effective method. The common chemical plugging agents mainly include polyacrylamide polymer gel, resin ...

AI Technical Summary

Problems solved by technology

With the increasing difficulty of oilfield exploitation, there are many problems and limitations in the existing chemical water shutoff agents. Non-selective water shutoff often causes false plugging, blocking water and oil at the same time, and sediment water shutoff agents can also Cause serious reservoir damage, affecting production

In addition, the water blocking agent has problems such as poor salt resistance, corrosion resistance and weak scouring performance, resulting in a short validity period of the water blocking agent.