Profile modification agent for amphion jelly

Abstract

The invention provides a profile modification agent for amphion jelly. The profile modification agent comprises the following components by weight percent: 0.1%-0.3% of amphion polymer, 0.1%-0.3% of compound cross-linking agent and the balance of water, wherein the molecule weight of the amphion polymer is above 1500 ten thousand. The compound cross-linking agent is prepared by a method comprising the following steps: firstly, adding phenol and formaldehyde in an enamel reaction kettle with a stirrer at a mass ratio of 1:1, heating and raising the temperature to 60 DEG C, then adding triethanolamine so that the phenol and formaldehyde are reacted to generate a mixture of monohydroxymethyl phenol, dihydroxymethyl phenol and trihydroxymethyl phenol for later use; next, adding sodium dichromate and thiourea in the reaction kettle with the stirrer at a weight ratio of 1:1, adding hydrochloric acid and a mixture of sodium acetate and sodium malonate which are at a weight ratio of 1:1 to react for 12 hours for later use; and mixing the products obtained from the former two steps at an isovolumetric ratio, and adding absolute ethyl alcohol for evenly stirring so as to obtain the compound cross-linking agent. According to the invention, the glue-forming property and glue-forming strength of the jelly profile modification agent in high-hypersalinity oil field water are improved, and the validity of the profile modification of the oil field is prolonged.

Description

technical field [0001] The invention relates to a reagent for oil reservoir profile control, in particular to a zwitterionic jelly profile control agent. Background technique [0002] The traditional jelly-type profile control agent uses anionic polymer as the gelling agent of the profile control agent, and uses metal ions or phenolic system for cross-linking to form jelly. When the salinity of reservoir water and the degree of hydrolysis of anionic polymers are high, the anionic polymers in traditional profile control agents will interact with Ca 2+ , Mg 2+ The reaction produces precipitation, and the reaction between the polymer and the cross-linking agent is not easy to generate jelly. Even if the jelly is formed, as the jelly is placed in the formation for a long time, the anions in the polymer and Ca 2+ , Mg 2+ Continue the reaction to shrink the molecular chain of the polymer, squeeze out the moisture carried in the profile control agent, and make the traditional p...

AI Technical Summary

Problems solved by technology

Even if the jelly is formed, as the jelly is placed in the formation for a long time, the anions in the polymer and Ca 2+ , Mg 2+ Continue to react to shrink the polymer molecular chain, squeeze out the water carried in the profile control agent, and make the traditional profile control agent shrink and lose the profile control effect

In addition, the cross-linking agent used is selective: either it only cross-links with amide groups or only cross-links with carboxysodium groups, both of which lead to low jelly strength and poor stability