Tectorial membrane sand solidifying system suitable for low-temperature reservoir sand prevention

Abstract

The present invention provides a tectorial membrane sand solidifying system suitable for low-temperature reservoir sand prevention, which is a solidifying system with high reactive activity under water environment and low-temperature condition formed by mixing low-temperature tectorial membrane sand using complex novolac epoxy as plasteringagent and a water-soluble firming agent. Wherein liquid phenolic resin, liquid novolac epoxy and solid novolac epoxy are mixed according to a certain proportion, and then, are stirred evenly when temperature is raised to the softening point of the solid novolac epoxy to prepare the complex novolac epoxy; then, the complex novolac epoxy is used as the plasteringagent, and quartz sand, resin acceptor, intensifier and the like as raw material to prepare the low-temperature tectorial membrane sand is prepared by coating. The water-soluble firming agent is formed by mixing triethylene tetramine, quadrol, phenol, formaldehyde, acetone and the like. Under the function of the water-soluble firming agent, the low-temperature tectorial membrane sand can be solidified during the temperature range of 30 DEG C to 50 DEG C; the pressive strength and the permeability of the formed induration are high; the present invention has the strong abilities of temperature resistance, aging resistance and scour resistance; and the present invention can satisfy the needs of low-temperature reservoir sand prevention.

Description

technical field [0001] The invention relates to an oilfield chemical agent, in particular to a cementing agent and a curing agent used in a low-temperature coated sand curing system. Background technique [0002] The artificial borehole wall sand control method is commonly used in oil fields to prevent sand production in oil and water wells, and the artificial borehole wall method with coated sand is a chemical sand control method with better effect at present. The preparation of coated sand requires a cement, and the cement that can be used includes phenolic resin, furan resin, polyurethane resin, epoxy resin, etc. Among them, the curing temperature of phenolic resin, furan resin and polyurethane resin is relatively high, generally higher than 60°C, and the curing strength at low temperature is very low, or even not cured. Although epoxy resin can be cured under low temperature conditions, it must use an organic solvent as a dispersion medium, and the curing strength is ve...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a low-temperature coated sand curing system that can form a consolidated body with higher compressive strength under low-temperature oil reservoir conditions, so as to overcome the current common resin-coated sand curing system under low temperature or water environment. The formed consolidated body has low or uncured consolidation strength and other disadvantages