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A kind of partially branched partially crosslinked polymer oil displacement agent and preparation method thereof

A technology of cross-linked polymer and oil-displacing agent, applied in chemical instruments and methods, drilling composition, etc., to achieve the effects of high suspension capacity, good elasticity and shear resistance, and efficient profile adjustment

Active Publication Date: 2019-05-10
CHINA PETROLEUM & CHEM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the special bisallyl functional group structure of DMDAAC makes it used as a crosslinking agent in the polymerization process, the polyacrylamide with both branched and crosslinked structures is polymerized by using DMDAAC as a crosslinking agent and branching agent. It has not been reported yet, and the ratio of DMDAAC to AM is in the range of 1:20 to 1:500, and the copolymer of DMDAAC and AM prepared by adiabatic polymerization has not been reported.

Method used

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  • A kind of partially branched partially crosslinked polymer oil displacement agent and preparation method thereof
  • A kind of partially branched partially crosslinked polymer oil displacement agent and preparation method thereof
  • A kind of partially branched partially crosslinked polymer oil displacement agent and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0057] (1) Preparation of solution

[0058] Dissolve 100 parts of acrylamide in 250 parts of deionized water to make a solution, dissolve 2.28 parts of dimethyl diallyl ammonium chloride in 40 parts of deionized water to make a solution, and dissolve 0.05 parts of potassium persulfate in 10 parts of deionized water to make a solution, 0.003 parts of sodium bisulfite dissolved in 10 parts of deionized water to make a solution;

[0059] (2) Preparation of oil displacement agent by polymerization reaction

[0060] Add the acrylamide solution and the dimethyldiallylammonium chloride solution prepared in step (1) into the reactor in sequence, and remove the oxygen in the reactor and the reaction solution while stirring and passing nitrogen for 15 minutes at a temperature of 12°C. Then add potassium persulfate solution and sodium bisulfite solution in turn to initiate the polymerization reaction. After the reaction is polymerized until the viscosity of the system increases signific...

Embodiment 2

[0064] (1) Preparation of solution

[0065] Dissolve 100 parts of acrylamide in 250 parts of deionized water to make a solution, dissolve 1.53 parts of dimethyl diallyl ammonium chloride in 40 parts of deionized water to make a solution, and dissolve 0.04 parts of potassium persulfate in 10 parts of deionized water are made into a solution, and 0.05 part of sodium bisulfite is dissolved in 10 parts of deionized water to make a solution;

[0066] (2) Polymerization reaction to prepare oil displacement agent.

[0067] Stir the acrylamide solution and dimethyl diallyl ammonium chloride solution prepared in step (1) and pass nitrogen for 15 minutes at a temperature of 12°C to remove oxygen in the reactor and the reaction solution, and then add potassium persulfate in sequence solution and sodium bisulfite solution to initiate a polymerization reaction. After the reaction is polymerized until the viscosity of the system increases significantly, stop feeding nitrogen and stirring. ...

Embodiment 3

[0071] (1) Preparation of solution

[0072] Dissolve 100 parts of acrylamide in 250 parts of deionized water to make a solution, dissolve 0.9 parts of dimethyl diallyl ammonium chloride in 40 parts of deionized water to make a solution, and dissolve 0.025 parts of potassium persulfate in 10 parts of deionized water to make a solution, 0.02 parts of sodium bisulfite dissolved in 10 parts of deionized water to make a solution;

[0073] (2) Preparation of oil displacement agent by polymerization reaction

[0074] Add the acrylamide solution prepared in step (1) and the dimethyl diallyl ammonium chloride solution into the reactor in sequence, and remove the oxygen in the reactor and the reaction solution while stirring and passing nitrogen gas at a temperature of 12°C for 15 minutes, and then Add potassium persulfate solution and sodium bisulfite solution in sequence to initiate the polymerization reaction. After the reaction is polymerized until the viscosity of the system incre...

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Abstract

The invention discloses a partially-branched and partially-crosslinked polymer oil displacement agent and a preparation method thereof. The polymer oil displacement agent mainly comprises components of raw materials as follows: acrylamide, potassium persulfate, sodium bisulfite, dimethyl diallyl ammonium chloride and ammonium carbonate. The preparation method comprises steps as follows: the components of the raw materials are dissolved in deionized water with the formula quantity not less than 1.0 time of the formula mass of all the components, and solutions of all the components are prepared; an acrylamide solution, a dimethyl diallyl ammonium chloride solution and an ammonium carbonate solution are added to a reactor and stirred, nitrogen is introduced at the temperature of 10-30 DEG C, oxygen in a container is removed and exhausted, a potassium persulfate solution and a sodium bisulfite solution are added, introduction of nitrogen and stirring are stopped when a reaction system starts polymerization and the viscosity is remarkably increased, and the colloidal oil displacement agent is prepared when a polymerization reaction realizes constant temperature. The partially-branched and partially-crosslinked polymer oil displacement agent has good use performance, ageing-resistant performance, heat resistance and salt tolerance.

Description

technical field [0001] The invention relates to the technical field of polymer material oil displacement agents, in particular to a partially branched and partially crosslinked polymer oil displacement agent and a preparation method thereof. Background technique [0002] According to the different stages of oilfield development, oil exploitation is generally divided into three stages: the primary oil recovery using the energy of the oil layer to extract oil, the oil recovery efficiency of this stage is generally only about 15%; the energy of the oil layer is replenished by injecting water and gas into the oil layer to achieve The purpose of mining is secondary oil recovery, and the oil recovery rate is 30-40%; the stage of crude oil extraction through new technologies such as physics, chemistry, and biology is tertiary oil recovery. In order to efficiently extract the residual oil in the formation, it is urgent to develop a tertiary oil recovery method suitable for the speci...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F226/02C08F4/40C09K8/588
Inventor 孙焕泉曹绪龙黄光速宋新旺郑静刘坤姜祖明陈晓彦李江波
Owner CHINA PETROLEUM & CHEM CORP
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