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A double network partially crosslinked partially branched polymer oil displacement agent and its preparation method

A branched polymer, cross-linked part technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of increasing the dosage, inability to obtain a higher degree of cross-linking, etc., and achieve high-efficiency profile adjustment, good resistance The effect of temperature and salt resistance and excellent high temperature aging resistance

Active Publication Date: 2017-08-25
SICHUAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the synthesis reaction of the partially branched and partially crosslinked polyacrylamide oil displacement agent is a kinetically controlled reaction, the crosslinking agent N,N-dimethylaminoethyl methacrylate (DMAEMA) is also a A reducing agent, simply increasing its dosage, cannot obtain a higher degree of cross-linking, so it is necessary to introduce a new cross-linking system to prepare a partially branched and partially cross-linked polyacrylamide oil displacement agent with multiple networks to meet the increasing Harsh high-temperature and high-salt reservoir conditions

Method used

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  • A double network partially crosslinked partially branched polymer oil displacement agent and its preparation method
  • A double network partially crosslinked partially branched polymer oil displacement agent and its preparation method
  • A double network partially crosslinked partially branched polymer oil displacement agent and its preparation method

Examples

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Effect test

Embodiment 1

[0051] (1) Preparation of solution

[0052] Dissolve 100 parts of acrylamide in 240 parts of deionized water to make a solution, dissolve 0.35 parts of N,N-dimethylaminoethyl methacrylate in 15 parts of deionized water to make a solution, and 0.04 parts of methylol Acrylamide was dissolved in 15 parts of deionized water to make a solution, 0.022 parts of potassium persulfate was dissolved in 30 parts of deionized water to make a solution, and 0.004 parts of sodium bisulfite was dissolved in 30 parts of deionized water to make a solution ;

[0053] (2) Preparation of oil displacement agent by polymerization reaction

[0054] Add the acrylamide solution, methylolacrylamide solution, and N,N-dimethylaminoethyl methacrylate solution prepared in step (1) into the reactor in sequence, and remove the reactor while stirring and blowing nitrogen at a temperature of 12°C for 15 minutes Internally neutralize the oxygen in the reaction liquid, then add potassium persulfate solution and ...

Embodiment 2

[0058] (1) Preparation of solution

[0059] Dissolve 100 parts of acrylamide in 240 parts of deionized water to make a solution, dissolve 0.45 parts of N,N-dimethylaminoethyl methacrylate in 15 parts of deionized water to make a solution, and 0.02 parts of methylol Acrylamide was dissolved in 15 parts of deionized water to make a solution, 0.0275 parts of potassium persulfate was dissolved in 30 parts of deionized water to make a solution, and 0.0045 parts of sodium bisulfite was dissolved in 30 parts of deionized water to make a solution ;

[0060] (2) Preparation of oil displacement agent by polymerization reaction

[0061] Add the acrylamide solution, methylolacrylamide solution, and N,N-dimethylaminoethyl methacrylate solution prepared in step (1) into the reactor in sequence, and remove the reactor while stirring and blowing nitrogen at a temperature of 12°C for 15 minutes Internally neutralize the oxygen in the reaction liquid, then add potassium persulfate solution an...

Embodiment 3

[0065] (1) Preparation of solution

[0066] Dissolve 100 parts of acrylamide in 240 parts of deionized water to make a solution, dissolve 0.175 parts of N,N-dimethylaminoethyl methacrylate in 15 parts of deionized water to make a solution, and 0.017 parts of methylol Acrylamide was dissolved in 15 parts of deionized water to make a solution, 0.033 parts of potassium persulfate was dissolved in 30 parts of deionized water to make a solution, and 0.0032 parts of sodium bisulfite was dissolved in 30 parts of deionized water to make a solution ;

[0067] (2) Preparation of oil displacement agent by polymerization reaction

[0068] Add the acrylamide solution, methylolacrylamide solution, and N,N-dimethylaminoethyl methacrylate solution prepared in step (1) into the reactor in sequence, and remove the reactor while stirring and blowing nitrogen at a temperature of 12°C for 15 minutes Neatize the oxygen in the solution, then add potassium persulfate solution and sodium bisulfite s...

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Abstract

The invention discloses a double network partially cross-linked partially branched polymer oil displacement agent and a preparation method thereof. The raw material components of the polymer oil displacement agent mainly include acrylamide, potassium persulfate, sodium bisulfite, methylol Acrylamide and N, N-dimethylaminoethyl methacrylate; its preparation method: each component of the raw material is dissolved in deionized water not less than 1.0 times the mass of the formula, and the solution of each component is prepared ; Add acrylamide solution, methylolacrylamide solution, and N,N-dimethylaminoethyl methacrylate solution into the reactor, while stirring, pass nitrogen gas at 0-30°C to remove the oxygen in the discharge container, add Potassium persulfate solution and sodium bisulfite solution, after the reaction system begins to polymerize, the viscosity increases significantly, stop feeding nitrogen and stirring, and polymerize until the temperature is constant, that is, the colloidal oil displacing agent is prepared. The invention has good elasticity and shearing resistance, and excellent aging resistance and salt resistance under high-temperature and high-salt conditions.

Description

technical field [0001] The invention relates to the technical field of polymer material oil displacement agents, in particular to a double network partially crosslinked partially branched polymer oil displacement agent and a preparation method thereof. Background technique [0002] According to the different stages of oil field 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 reach 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 fully exploit the residual oil in the formation, it is urgent to develop a tertiary oil recovery method suitable for the s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F220/58C08F220/34C09K8/588
Inventor 黄光速曹绪龙李振泉郑静祝仰文李江波陈晓彦王超
Owner SICHUAN UNIV
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