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...

Examples

Embodiment 1

[0015] Zwitterionic gel profile control agent, its mass components are:

[0016] 0.1% zwitterionic polymer, the molecular weight of the zwitterionic polymer is 15 million, the cationic degree is 10%, and the anionic degree is 20%;

[0017] 0.3% composite cross-linking agent is prepared in the following way. First, add phenol and formaldehyde in a mass ratio of 1:1 in an enamel reactor with agitator. After heating to 60°C, add triethanolamine to make phenol and formaldehyde Reaction generates the mixture of one, two, trimethylol phenols, for subsequent use, the amount of triethanolamine added wherein is 1% of phenol and formaldehyde gross weight; Secondly, the thiourea of ​​10% sodium dichromate and 15% by weight Add the mixture of sodium acetate and sodium malonate with a concentration of 30% hydrochloric acid and a weight ratio of 1:1 to a reaction kettle with a stirrer at a ratio of 1:1, and the amount of hydrochloric acid added is dichromic acid 1% of sodium and thiourea t...

Embodiment 2

[0020] Zwitterionic gel profile control agent, its mass components are:

[0021] 0.3% zwitterionic polymer, the molecular weight of the zwitterionic polymer is 20 million, the cationic degree is 5%, and the anionic degree is 15%;

[0022] 0.1% composite cross-linking agent is prepared in the following way. First, add phenol and formaldehyde in a mass ratio of 1:1 in an enamel reactor with agitator. After heating to 60°C, add triethanolamine to make phenol and formaldehyde The reaction generates a mixture of one, two, and trimethylol phenols, which are for subsequent use, wherein the amount of triethanolamine added is 2% of the total weight of phenol and formaldehyde; secondly, 7% sodium dichromate and 10% thiourea are mixed by weight Add the mixture of sodium acetate and sodium malonate with a concentration of 35% hydrochloric acid and a weight ratio of 1:1 to a reaction kettle with a stirrer at a ratio of 1:1. The amount of hydrochloric acid added is sodium dichromate And 2%...

Embodiment 3

[0025] The zwitterionic jelly profile control agent is characterized in that its mass components are:

[0026] 0.2% zwitterionic polymer, the molecular weight of the zwitterionic polymer is 25 million, the cationic degree is 7%, and the anionic degree is 5%;

[0027] 0.2% composite cross-linking agent is prepared in the following way. First, add phenol and formaldehyde in a mass ratio of 1:1 in an enamel reactor with a stirrer. After heating to 60°C, add triethanolamine to make phenol and formaldehyde Reaction generates the mixture of one, two, trimethylol phenols, standby, wherein the amount of triethanolamine added is 1.5% of the total weight of phenol and formaldehyde; Secondly, 9% sodium dichromate and 12% thiourea are mixed by weight Add the mixture of sodium acetate and sodium malonate with a concentration of 37% hydrochloric acid and a weight ratio of 1:1 to a reaction kettle with a stirrer at a ratio of 1:1. The amount of hydrochloric acid added is sodium dichromate A...

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...

Examples

Embodiment 1

[0015] Zwitterionic gel profile control agent, its mass components are:

[0016] 0.1% zwitterionic polymer, the molecular weight of the zwitterionic polymer is 15 million, the cationic degree is 10%, and the anionic degree is 20%;

[0017] 0.3% composite cross-linking agent is prepared in the following way. First, add phenol and formaldehyde in a mass ratio of 1:1 in an enamel reactor with agitator. After heating to 60°C, add triethanolamine to make phenol and formaldehyde Reaction generates the mixture of one, two, trimethylol phenols, for subsequent use, the amount of triethanolamine added wherein is 1% of phenol and formaldehyde gross weight; Secondly, the thiourea of ​​10% sodium dichromate and 15% by weight Add the mixture of sodium acetate and sodium malonate with a concentration of 30% hydrochloric acid and a weight ratio of 1:1 to a reaction kettle with a stirrer at a ratio of 1:1, and the amount of hydrochloric acid added is dichromic acid 1% of sodium and thiourea t...

Embodiment 2

[0020] Zwitterionic gel profile control agent, its mass components are:

[0021] 0.3% zwitterionic polymer, the molecular weight of the zwitterionic polymer is 20 million, the cationic degree is 5%, and the anionic degree is 15%;

[0022] 0.1% composite cross-linking agent is prepared in the following way. First, add phenol and formaldehyde in a mass ratio of 1:1 in an enamel reactor with agitator. After heating to 60°C, add triethanolamine to make phenol and formaldehyde The reaction generates a mixture of one, two, and trimethylol phenols, which are for subsequent use, wherein the amount of triethanolamine added is 2% of the total weight of phenol and formaldehyde; secondly, 7% sodium dichromate and 10% thiourea are mixed by weight Add the mixture of sodium acetate and sodium malonate with a concentration of 35% hydrochloric acid and a weight ratio of 1:1 to a reaction kettle with a stirrer at a ratio of 1:1. The amount of hydrochloric acid added is sodium dichromate And 2%...

Embodiment 3

[0025] The zwitterionic jelly profile control agent is characterized in that its mass components are:

[0026] 0.2% zwitterionic polymer, the molecular weight of the zwitterionic polymer is 25 million, the cationic degree is 7%, and the anionic degree is 5%;

[0027] 0.2% composite cross-linking agent is prepared in the following way. First, add phenol and formaldehyde in a mass ratio of 1:1 in an enamel reactor with a stirrer. After heating to 60°C, add triethanolamine to make phenol and formaldehyde Reaction generates the mixture of one, two, trimethylol phenols, standby, wherein the amount of triethanolamine added is 1.5% of the total weight of phenol and formaldehyde; Secondly, 9% sodium dichromate and 12% thiourea are mixed by weight Add the mixture of sodium acetate and sodium malonate with a concentration of 37% hydrochloric acid and a weight ratio of 1:1 to a reaction kettle with a stirrer at a ratio of 1:1. The amount of hydrochloric acid added is sodium dichromate A...