Preparation method of high temperature resistant contraction-expansion system for promoting stratum clay modification

A high-temperature-resistant, clay-based technology, applied in the field of preparation of high-temperature-resistant shrinkage-swelling systems, can solve the problems of short anti-swelling period and inability to treat reservoirs, and achieve wide application range, high anti-swelling and shrinkage ratio, and long-lasting anti-swelling effect Effect

Active Publication Date: 2014-01-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most clay stabilizers can only prevent the swelling and migration of clay, and the anti-swelling period is short, and cannot treat the hydrated and swollen reservoir

Method used

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  • Preparation method of high temperature resistant contraction-expansion system for promoting stratum clay modification
  • Preparation method of high temperature resistant contraction-expansion system for promoting stratum clay modification
  • Preparation method of high temperature resistant contraction-expansion system for promoting stratum clay modification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The preparation method adopts the following raw materials and steps in molar proportions:

[0044] a. Take dimethylamine in the reaction kettle, control the temperature of the reaction kettle to 40°C through circulating water, add epichlorohydrin under stirring according to dimethylamine: epichlorohydrin = 4:1, when adding epoxy When the amount of chloropropane reaches 40%, the temperature is raised to 70°C, and then the remaining epichlorohydrin is added, reacted for 2 hours, and the pH=8 is detected, the reaction liquid is clear, and released from the reaction kettle to obtain intermediate A;

[0045] b. According to dimethylamine: acrylic acid = 1: 0.1, acrylic acid: potassium hydroxide = 1: 0.8, first dissolve potassium hydroxide in water, then add acrylic acid to the aqueous solution of potassium hydroxide; then according to acrylic acid: acrylamide =1:0.5, add acrylamide to make it miscible, check pH=7, and get a mixed solution;

[0046] c. Add ammonium persulfat...

Embodiment 2

[0048] The preparation method adopts the following raw materials and steps in molar proportions:

[0049] a. Take dimethylamine in the reactor, control the temperature of the reactor to 25°C through circulating water, add epichlorohydrin under stirring according to dimethylamine: epichlorohydrin = 3:1, when adding epoxy When the amount of chloropropane reaches 60%, the temperature is raised to 65°C, and then the remaining epichlorohydrin is added, reacted for 3 hours, and the pH=6 is detected, the reaction liquid is clear, and it is released from the reaction kettle to obtain intermediate A;

[0050] b. According to dimethylamine: acrylic acid = 1: 0.05, acrylic acid: potassium hydroxide = 1: 1.2, first dissolve potassium hydroxide in water, then add acrylic acid to the aqueous solution of potassium hydroxide, and then follow acrylic acid: acrylamide =1:0.2, add acrylamide to make it miscible, check pH=9, and get a mixed solution;

[0051] c. Add ammonium persulfate to the mi...

Embodiment 3

[0053] The preparation method adopts the following raw materials and steps in molar proportions:

[0054] a. Take dimethylamine in the reactor, control the temperature of the reactor to 35°C through circulating water, add epichlorohydrin under stirring according to dimethylamine: epichlorohydrin = 3.5:1, when adding epoxy When the amount of chloropropane reached 50%, the temperature was raised to 62°C, and then the remaining epichlorohydrin was added, and the reaction was carried out for 2.5 hours, and the pH was detected to be 7 to obtain intermediate A;

[0055] b. According to dimethylamine: acrylic acid = 1: 0.08, acrylic acid: potassium hydroxide = 1: 1.0, first dissolve potassium hydroxide in water, then add acrylic acid to the aqueous solution of potassium hydroxide, and then follow acrylic acid: acrylamide =1:0.3, add acrylamide to make it miscible, check pH=8, and get a mixed solution;

[0056] c. Add ammonium persulfate to the mixed solution of step b under the prot...

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Abstract

The invention provides a preparation method of a high temperature resistant contraction-expansion system for promoting stratum clay modification. The high temperature resistant contraction-expansion system is prepared from the following raw materials in parts by mol by using the preparation method in the following steps: a. adding dimethylamine into a reaction kettle, controlling the temperature to 25-45 DEG C, adding epoxy chloropropane while stirring according to a ratio of dimethylamine to epoxy chloropropane of (3-4): 1, heating up to 65-70 DEG C when adding the epoxy chloropropane to 40-60% of the dosage, and then, adding the residual epoxy chloropropane, and reacting for 2-3 h to obtain an intermediate A; b. firstly dissolving potassium hydroxide in water and adding crylic acid in the aqueous solution of potassium hydroxide according to a mol ratio of dimethylamine to crylic acid of 1: (0.05-0.1) and a mol ratio of crylic acid to potassium hydroxide of 1: (0.8-1.2), and then, adding acrylamide according to a mol ratio of crylic acid to acrylamide of 1: (0.2-0.5) to obtain a mixed solution; and c. adding an initiator into the mixed solution obtained in the step b under nitrogen protection, stirring to react for 2-3h, adding the intermediate A obtained in the step a, and reacting for 2-3 h to obtain a product.

Description

Technical field: [0001] The invention relates to a preparation method of a clay anti-swelling and shrinking system in oil exploitation, in particular to a preparation method of a high-temperature-resistant shrinking and swelling system that promotes the modification of formation clay. Background technique: [0002] During the development of oil and gas fields, some sensitive reservoirs contain clay minerals (montmorillonite and illite). These components will expand and migrate when exposed to water, and the permeability of the formation will decrease, which seriously affects the oil and gas development effect. Moreover, with the continuous water injection of this type of oil and water wells, the coning of bottom water and the entry of water for acidification, fracturing, and workover industries will gradually reduce the permeability of clay-containing formations, directly affecting the normal production of oil and water wells. In the block developed by water injection, the c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/10C08F220/06C08F220/56C09K8/575
Inventor 王世虎何绍群王善堂尚跃强张仲平林吉生王秋霞曹嫣镔曹秋芳贺文媛孟秋玉
Owner CHINA PETROLEUM & CHEM CORP
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