Novel acid-resistant salt-resistant swelling shrinking agent and preparation method thereof

A shrinkage-swelling and salt-tolerant technology, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems affecting oil and gas development effects, formation permeability decline, etc., to achieve good compatibility, inhibit water swelling, prevent damage effect

Active Publication Date: 2021-03-09
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a new type of acid-resistant and salt-resistant shrinkage agent and its preparation method, which solves the problem in

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0030] Example 1

[0031] A novel temperature-resistant salt-resistant reduduulation agent is added to the reaction kettle first to add 22.425 g of acrylamide, 0.1 g of double acrylamide and 7.475 g of methacryloxyethyltrimethyl ammonium chloride, and 100 ml is added under stirring. Hide 2 O, warmed to 30 ° C, reactive for 30 minutes, so that the system becomes a clear transparent solution, the temperature is adjusted to 80 ° C, and the equal temperature is raised to 80 ° C, mixed with ammonium sulfate 0.1 g and 50 ml of water mixed, uniform In the mixed liquid in the reactor, it was added dropwise to about 30 minutes, and the white transparent liquid was obtained, and the reaction was further reacted for 2.5 h, resulting in a pale yellow transparent gel;

[0032] 3 g of polyether amine and 1 g of dimethyl carbonate were mixed with 50 mL of water, and the temperature was adjusted to 85 ° C, stirred for 2 h, and the synthetic polymer was added to the above solution, stir mixed and ...

Example Embodiment

[0035] Example 2

[0036] A novel temperature-resistant salt-resistant reduduant, 12.425 g of acrylamide, 0.2 g of double acrylamide and 7.475 g of methacryloxyethyltrimethyl ammonium chloride, and 100 ml of stirring Hide 2 O, warmed to 30 ° C, reactive 30 minutes, so that the system becomes a clear transparent solution, the temperature is adjusted to 85 ° C, and the equal temperature is raised to 85 ° C, mixed with ammonium sulfate 0.2 g and 50 ml of water mixed, uniform In the mixed liquid in the reactor, it was added dropwise to about 30 minutes, and the white transparent liquid was obtained, and the reaction was continued for 2 h, resulting in a light yellow transparent gel;

[0037] 3 g of polyether amine and 1 g of dimethyl carbonate were mixed with 50 mL of water, and the temperature was adjusted to 85 ° C, stirred for 2 h, and the synthetic polymer was added to the above solution, stir mixed and uniform, to obtain a pale yellow transparent liquid, that is, the target Reduc...

Example Embodiment

[0039] Example 3

[0040] A novel temperature-resistant salt-resistant reduduulation, 33.6 g of acrylamide, 0.2 g of double acrylamide and 11.2 g of methacryloxyethyltrimethyl ammonium chloride, add 100 ml in agitation. Hide 2 O, the temperature is warmed to 30 ° C, the reaction is 30 minutes, so that the system becomes a clear transparent solution, the temperature is adjusted to 80 ° C, the like temperature is raised to 80 ° C, mix the ammonium sulfate 0.2 g and 50 ml of water mixed, uniform drop In the mixed liquid in the reactor, after about 30 minutes, it was added to give a white transparent liquid, and the reaction was continued for 3 h, resulting in a pale yellow transparent gel;

[0041] 9 g of polyether amine and 3 g of dimethyl carbonate were mixed with 50 ml of water, and the temperature was adjusted to 80 ° C, stirred for 2.5 h, and the synthesized polymer was added to the above solution, stir mixed and uniform, to give a light yellow transparent liquid, ie Target deco...

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PUM

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Abstract

The invention discloses a novel acid-resistant and salt-resistant swelling shrinking agent and a preparation method thereof. The swelling shrinking agent is prepared from the following components in parts by mass: 3-9 parts of polyether amine; 1-3 parts of dimethyl carbonate; 22.425-33.6 parts of acrylamide; 7.475-11.2 parts of methacryloyloxyethyl trimethyl ammonium chloride; 0.1-0.2 part of bisacrylamide; 0.1-0.2 part of ammonium persulfate; and 50-150 parts of a solvent. The swelling shrinking agent prepared by the method can be operated under the conditions of high temperature, acidity andsalinity, has good compatibility with the stratum, and can effectively inhibit the swelling, dispersion and migration of stratum clay minerals when meeting water, so that the swelling clay is dehydrated and shrunk. The residual monomer content of the product produced by the synthesis method is low, and the polymer with large relative molecular mass, high cationic degree and good stability is obtained. The swelling shrinking agent has the advantages of simple preparation process, low price, easy operation, little pollution, and easiness for industrial production.

Description

technical field [0001] The invention belongs to the technical field of oilfield chemicals, and in particular relates to a novel acid-resistant and salt-resistant shrinkage agent and a preparation method thereof. Background technique [0002] In the process of oilfield water flooding development, oil reservoirs usually contain a lot of clay minerals, such as montmorillonite, illite, chlorite and kaolinite. When these components encounter water, they will expand, disperse and migrate, which will reduce the permeability of the formation and increase the water injection pressure, seriously affecting the oil and gas development effect. [0003] Swelling agent is a kind of chemically synthesized polymer cationic compound, which modifies the clay lattice through physical and chemical reactions with clay minerals, so that it does not expand when it meets water; the expanded clay lattice is modified by chemical reaction. After sex, water molecules are released and the crystal lattic...

Claims

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Application Information

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IPC IPC(8): C09K8/588C09K8/74C09K8/88C08F220/56C08F220/34C08F222/38
CPCC09K8/588C09K8/74C09K8/882C08F220/56C09K2208/12C09K2208/18C08F220/34C08F222/385
Inventor 于佳星师永民田雨梁宝兴
Owner SHAANXI UNIV OF SCI & TECH
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