Partially-crosslinked and partially-branched copolymer oil displacement agent and preparation method thereof

A technology of cross-linking part and oil-displacing agent, which is applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of low phase viscosity, poor shear resistance, temperature resistance and salt resistance, and difficulty in pore migration, etc. Achieve high viscosity, improved aging and salt resistance, good elasticity and shear resistance

Inactive Publication Date: 2015-12-16
RES INST OF PETROLEUM EXPLORATION & DEV SHENGLI OILFIELD CO LTD SINOPEC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Chinese invention patent (201010028113.4) discloses a partially branched and partially cross-linked polyacrylamide oil displacing agent. The shortcomings of poor shear and temperature resistance and salt resistance, and overcome the shortcomings of fully cross-linked polyacrylamide bulk phase viscosity, obvious settlement, and difficult migration in pores

Method used

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  • Partially-crosslinked and partially-branched copolymer oil displacement agent and preparation method thereof
  • Partially-crosslinked and partially-branched copolymer oil displacement agent and preparation method thereof
  • Partially-crosslinked and partially-branched copolymer oil displacement agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] (1) Preparation of solution

[0057] Dissolve 100 parts of acrylamide in 270 parts of deionized water to make a solution and dissolve in 20 parts of deionized water to make a solution, and dissolve 0.20 parts of N,N-dimethylaminoethyl methacrylate in 10 parts of deionized water To make a solution, 0.015 parts of potassium persulfate is dissolved in 10 parts of deionized water to make a solution, and 0.03 part of sodium bisulfite is dissolved in 10 parts of deionized water to make a solution;

[0058] (2) Preparation of oil displacement agent by polymerization reaction

[0059] Add the acrylamide solution prepared in step (1) and the N,N-dimethylaminoethyl methacrylate solution into the reactor in sequence, and remove the oxygen in the reactor and the reaction solution while stirring and blowing nitrogen at a temperature of 30°C for 15 minutes , and then sequentially add potassium persulfate solution and sodium bisulfite solution to initiate the polymerization reaction ...

Embodiment 2

[0063] (1) Preparation of solution

[0064] Dissolve 100 parts of acrylamide in 270 parts of deionized water to make a solution, dissolve 9 parts of N,N-dimethylacrylamide in 20 parts of deionized water to make a solution, and 0.30 parts of Methylamino ethyl ester was dissolved in 20 parts of deionized water to make a solution, 0.015 parts of potassium persulfate was dissolved in 20 parts of deionized water to make a solution, and 0.008 part of sodium bisulfite was dissolved in 20 parts of deionized water to make a solution;

[0065] (2) Preparation of oil displacement agent by polymerization reaction

[0066] Add the acrylamide solution, N,N-dimethylacrylamide, and N,N-dimethylaminoethyl methacrylate solution prepared in step (1) into the reactor in sequence, and pass nitrogen gas for 15 minutes under stirring at a temperature of 30°C Remove the oxygen in the reactor and the reaction solution, and then add potassium persulfate solution and sodium bisulfite solution in sequen...

Embodiment 3

[0070] (1) Preparation of solution

[0071]Dissolve 100 parts of acrylamide in 250 parts of deionized water to make a solution, dissolve 3 parts of sodium p-vinylbenzenesulfonate in 20 parts of deionized water to make a solution, 0.35 parts of methacrylic acid N,N-dimethyl Aminoethyl ester was dissolved in 10 parts of deionized water to make a solution, 0.015 parts of potassium persulfate was dissolved in 15 parts of deionized water to make a solution, and 0.003 part of sodium bisulfite was dissolved in 20 parts of deionized water to make a solution;

[0072] (2) Preparation of oil displacement agent by polymerization reaction

[0073] Add the acrylamide solution, sodium p-vinylbenzenesulfonate solution, and N,N-dimethylaminoethyl methacrylate solution prepared in step (1) into the reactor in sequence, and remove them by stirring and blowing nitrogen for 15 minutes at a temperature of 30°C. Oxygen in the reactor and in the reaction solution, and then add potassium persulfate ...

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Abstract

The invention discloses a partially-crosslinked and partially-branched copolymer oil displacement agent and a preparation method thereof. The copolymer oil displacement agent mainly comprises components of raw materials as follows: acrylamide, potassium persulfate, sodium bisulfite, 2-(dimethylamino) ethyl methacrylate and comonomers. 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 comonomer solution and a 2-(dimethylamino) ethyl methacrylate solution are added to a reactor and stirred, nitrogen is introduced at the temperature of 10 DEG C-60 DEG C while stirring is performed, 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 a colloidal oil displacement agent is prepared when a polymerization reaction realizes constant temperature. The partially-crosslinked and partially-branched copolymer oil displacement agent has good elasticity and anti-shear ability and excellent ageing-resistant performance and salt resistance under the high-temperature and high-salt conditions.

Description

technical field [0001] The invention relates to polymer material oil-displacing agent technology used in oil exploitation, in particular to a partially cross-linked partially branched copolymer oil-displacing 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 speci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/34C08F222/38C08F228/02C08F220/58C09K8/588
Inventor 孙焕泉李振泉黄光速郭兰磊祝仰文郑静姜祖明李江波刘汉超
Owner RES INST OF PETROLEUM EXPLORATION & DEV SHENGLI OILFIELD CO LTD SINOPEC
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