Thermosetting foam profile control agent and application thereof

Abstract

The invention discloses a thermosetting foam profile control agent and application thereof. The thermosetting foam profile control agent comprises a foam fixing agent, a curing agent and a foaming agent, wherein the foam fixing agent is a resin prepolymer, and the curing agent is water-soluble temperature control decomposition type slow-release acid. According to the invention, by researching anddeveloping water-soluble temperature-controlled decomposition slow-release acid and a temperature-resistant foaming agent, an underground cross-linked thermosetting phenolic foam plastic (wet method)meeting a thick oil thermal recovery plugging control construction process is modified and researched; a low-molecular resin prepolymer and a curing agent stably exist in a foam liquid film, so that the foaming volume and the half-life period are not influenced; and a curing agent is decomposed to generate an acid at a high temperature, hydrophilic resin hydroxymethyl bonds are catalyzed to be subjected to condensation polymerization to form hydrophobic resin methylene bonds, free water bound by a space net structure and coated with a liquid film is formed, and the foam liquid film is converted into a thermosetting resin hard shell, so that the influence of high temperature, stratum pore size and injected water dilution scouring on foam plugging strength, heat stability and validity periodis avoided.

Description

technical field [0001] The invention belongs to the technical field of oil field exploitation, and in particular relates to a thermosetting foam plugging regulating agent and application thereof. Background technique [0002] Steam injection thermal oil recovery is the most effective technical means to greatly increase the recovery of heavy oil and super heavy oil, but the unfavorable mobility ratio between steam and heavy oil, the heterogeneity conditions of the reservoir, and the pressure of steam itself Factors such as gravity overlay make it easy for steam to channel in the formation during steam injection for thermal recovery, and the uneven steam absorption profile reduces the utilization rate of steam, which affects the deep development of heavy oil reservoirs (Li Deru, Pang Zhanxi. Thermal Foam improves the development effect of steam flooding in heavy oil reservoirs, Special Reservoirs, 2016,23(5):89-92.). [0003] Nitrogen foam system can be injected into the deep...

AI Technical Summary

Problems solved by technology

However, the heavy oil thermal recovery plugging adjustment construction technology requires that the treatment agent be injected into the deep formation to delay the formation of thermosetting resin at high temperature, and the two synthesis processes form a sharp conflict.

As early as the 1950s, foreign countries began to use thermosetting phenolic resins in the fields of water plugging and profile control. However, during the preparation process, the resole phenolic prepolymer reacted with the curing agent to produce a water-separating viscous gel, which caused great risks in pumping construction. Well logging is required to determine the location of the water outlet point before operation, and mechanical seals are used to isolate the layer to be treated. The treatment radius is usually limited to within 30cm in the radial direction around the bottom of the well. Safety, the underground cross-linked phenolic resin technology was eliminated in the 1970s and is no longer used alone

Images