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Profile control agent and its preparation method and application

A profile control agent and regulator technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of high bacterial content in oilfield sewage, uncontrollable gel formation time, and short gel formation time.

Active Publication Date: 2022-05-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a profile control agent and its preparation method and application

Method used

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  • Profile control agent and its preparation method and application

Examples

Experimental program
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Effect test

preparation example 1

[0057] Preparation of Dodecylguanidine Modified Polyethyleneimine

[0058] (1) 20g polyethyleneimine is dissolved in deionized water, is mixed with the polyethyleneimine aqueous solution of 5wt%;

[0059] (2) 0.344g of dodecylguanidine acetate was added dropwise at a stirring speed of 600r / min at 50°C, and then the reaction was continued for 2h. After the reaction, the pH was adjusted to 10 with 1wt% sodium hydroxide solution to obtain a mixture solution. .

[0060] (3) After dialyzing the mixture solution in deionized water for 2 d, rotating to remove water to obtain dodecylguanidine modified polyethyleneimine.

preparation example 2

[0062] Preparation of octadecylguanidine modified polyethyleneimine

[0063] According to the method of Preparation Example 1, the difference is that 0.344 g of dodecylguanidine acetate is replaced with 2 g of octadecylguanidine acetate to obtain octadecylguanidine modified polyethyleneimine.

Embodiment 1

[0065] Dissolve 11.5g of polymer M in 1000g of oil field injection water, stir at a speed of 500r / min until uniformly dissolved; then add 1.05g of sodium thiosulfate, 0.15g of sodium hydroxide and 5.5g of dodecylguanidine in sequence to modify Polyethyleneimine, after stirring uniformly, the profile control agent was obtained. The profile control agent began to form gel after 5 days at 80°C, and the composite viscosity reached 18450mPa·s after the cross-linking reaction.

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Abstract

The invention relates to the technical field of oilfield profile control, and discloses a profile control agent, a preparation method and application thereof. The profile control agent comprises: a water-soluble thickener, a modified cross-linking agent, a stabilizer, a pH regulator and water; wherein, the modified cross-linking agent is alkylguanidine modified polyethyleneimine. The profile control agent provided by the invention can realize time-delayed and controllable cross-linking, and the jelly has a certain strength and has a bactericidal effect at the same time, so that one dose can be used for multiple purposes.

Description

technical field [0001] The invention relates to the technical field of oilfield profile control, in particular to a profile control agent and a preparation method and application thereof. Background technique [0002] Profile control refers to injecting the plugging agent system from the water injection well to plug the high permeability layer, so as to adjust the absorption profile of the water injection interval, improve the heterogeneity of the reservoir, and achieve the purpose of balanced flooding of the reservoir, which is to improve the development effect of water flooding. Effective Ways. [0003] Water plugging and profile control technology is an important means to improve reservoir heterogeneity under low oil prices, achieve balanced displacement and stabilize oilfield production. Existing plugging agents mainly include polymer jelly, gel, granule, foam, microorganism, etc. Among them, jelly system is the most used and most widely used type of plugging agent in p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/512C09K8/88
CPCC09K8/512C09K8/887
Inventor 杨金彪祝纶宇刘希胡晓娜伊卓方昭
Owner CHINA PETROLEUM & CHEM CORP
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