Polymer gel crosslinking agent capable of realizing controllable gelling time

Abstract

The invention relates to the field of oil field chemistry, and belongs to a polymer gel crosslinking agent capable of realizing the controllable gelling time. The polymer gel crosslinking agent mainlysolves the problems of gelling time uncontrollability and environment pollution of the frequently-used polymer gel crosslinking agents in an oil field. The polymer gel crosslinking agent is preparedfrom the following ingredients in percentage by weight: 0.2 to 0.3 percent of trivalent metal chromium ion salt, 0.01 to 0.03 percent of low-carbon mixed organic acid, 0.02 to 0.05 percent of organicacid, 0.03 to 0.06 percent of melamine, 0.01 to 0.04 percent of sodium sulfite and the balance of water. The polymer gel crosslinking agent has the advantages that the gelling time is controllable; the harm to the environment is small; good long-period thermal stability is realized, and the like.

Description

technical field [0001] The invention relates to the field of oilfield chemistry, and belongs to a polymer gel crosslinking agent which can realize controllable gelation time for oilfields. Background technique [0002] Since the polymer gel cross-linking agent commonly used in oil fields is a metal cross-linking agent mainly composed of high-priced chromium ions and aluminum ions, it cannot control the gelation time, cannot be extended or shortened to meet the requirements of on-site implementation, and is easy to pollute the medium, Low permeability zone; at the same time, the cross-linking agent reduces the cross-linking effect due to formation adsorption and other reasons, which also leads to poor controllability of the cross-linking reaction time. Contents of the invention [0003] The purpose of the present invention is to develop a polymer gel crosslinking agent that can control the gelation time of the crosslinking agent and can prolong or shorten it to meet the req...

AI Technical Summary

Problems solved by technology

[0002] Since the polymer gel cross-linking agent commonly used in oil fields is a metal cross-linking agent mainly composed of high-priced chromium ions and aluminum ions, it cannot control the gelation time, cannot be extended or shortened to meet the requirements of on-site implementation, and is easy to pollute the medium, Low permeability zone; at the same time, the cross-linking agent reduces the cross-linking effect due to formation adsorption and other reasons, which also leads to poor controllability of the cross-linking reaction time