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Preparation method of high-temperature-resistant high-salt polymer oil-replacement agent

A polymer and oil-displacing agent technology, applied in the field of preparation of high-temperature and high-salt polymer oil-displacing agents, can solve the problems of hydrodynamic volume reduction, precipitation, and viscosity reduction, and achieve improved solubility and good water solubility , Improve the effect of temperature resistance

Active Publication Date: 2011-09-14
黑龙江吉地油田服务股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cations in the aqueous solution, especially the divalent ions, will shield the ionic groups in the polymer, make the polymer molecular chain curl, reduce the hydrodynamic volume or even precipitate, so that the viscosity increase is greatly reduced

Method used

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  • Preparation method of high-temperature-resistant high-salt polymer oil-replacement agent
  • Preparation method of high-temperature-resistant high-salt polymer oil-replacement agent
  • Preparation method of high-temperature-resistant high-salt polymer oil-replacement agent

Examples

Experimental program
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Effect test

Embodiment 1

[0011] 10Kg of acrylic acid, 53Kg of propylene sulfonate, 12Kg of N, N-diethyl diallyl ammonium chloride, 4Kg of octadecyl acrylate and 58Kg of acrylamide were dissolved in deionized water. The mass is 16% concentration, then add sodium lauryl sulfate of 2% of the total monomer weight, adjust the pH of the solution: 9-10, and pass N under the condition of temperature 35°C 2 Add the initiator ammonium persulfate after 30 minutes, the amount of ammonium persulfate added is 0.06% of the total weight of the monomer, react for 12 hours at a temperature of 35 ° C, precipitate with acetone, wash, and dry in vacuum to obtain a white powder polymer.

Embodiment 2

[0013] 11Kg of acrylic acid, 65Kg of 2-acrylamido-2-sodium methylpropanesulfonate, 15Kg of N, N-diethyl diallyl ammonium chloride, 3Kg of lauryl acrylate, 2Kg of C 6-10 α-Olefin and 59Kg of acrylamide were dissolved in deionized water, the total mass concentration of the monomer was 17%, and then 2% of the total monomer weight of sodium lauryl sulfate was added to adjust the pH of the solution: 9 to 10, at temperature N at 40°C 2 Add the initiator potassium persulfate after 30 minutes, the amount of potassium persulfate added is 0.06% of the total weight of the monomer, react for 12 hours at a temperature of 40°C, precipitate with acetone, wash, and dry in vacuum to obtain a white powder of polymers.

Embodiment 3

[0015] 15Kg of methacrylic acid, 63Kg of sodium methacrylate hydroxypropyl sulfonate, 20Kg of trimethallyl ammonium chloride, 3Kg of lauryl acrylate, 2Kg of C 12-16 α-Olefin and 51Kg of acrylamide were dissolved in deionized water, the total mass concentration of the monomer was 19%, and then 2.9% of the total monomer weight of sodium dodecyl sulfate was added to adjust the pH of the solution to 9-10, and the temperature was 35 N at ℃ 2 Add the initiator potassium persulfate after 30 minutes, the amount of potassium persulfate added is 0.08% of the total weight of the monomer, react at a temperature of 35°C for 12 hours, precipitate with acetone, wash, and dry in vacuum to obtain a white powdery polymer thing.

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Abstract

The invention relates to a preparation method of a high-temperature-resistant high-salt polymer oil-replacement agent, which comprises the following steps: dissolving 10-20 parts by weight of anionic monomer, 50-65 parts by weight of sodium allylsulfonate, 11-22 parts by weight of cationic monomer, 2-4 parts by weight of acrylate, 0-3.5 parts by weight of alpha-alkene and 50-60 parts by weight ofacrylamide in deionized water, wherein the total mass concentration of the monomers is 15-23%; adding a surfactant which accounts for 1-5% of the total weight of the monomers, regulating the pH valueof the solution to 9-10, introducing ammonia gas at 30-60 DEG C for 30 minutes, and adding a persulfate initiator which accounts for 0.05-0.1% of the total weight of the monomers; and reacting at 30-60 DEG C for 12 hours, precipitating with acetone, washing, and carrying out vacuum drying to obtain the white powdery polymer. The invention is characterized in that long-carbon-chain alkyl group, anionic and cationic unit structures are introduced into the water-soluble polymer macromolecules to obtain the high-temperature-resistant high-salt water-soluble polymer oil-replacement agent.

Description

technical field [0001] The invention relates to a preparation method of an auxiliary agent in the field of oil recovery, in particular to a preparation method of a high-temperature and high-salt polymer oil displacement agent. Background technique: [0002] At present, polymer flooding technology is the main technology to enhance oil recovery in oilfield development. It is successful in technology and economy. It has been widely used at home and abroad, and has broad application prospects. [0003] In the current stage of oil and gas production, the stability requirements of water-soluble polymers are getting higher and higher, and the stability includes shear stability, chemical stability, thermal stability, biological stability and long-term stability. Specifically, water-soluble polymers can maintain a certain viscosity under the influence of high salinity, high temperature, high shear and different pH values. This is also an aspect that is currently being considered in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F228/02C08F220/06C08F226/02C08F220/18C08F220/58C08F210/14C08F220/38C09K8/588
CPCC09K8/588
Inventor 孙安顺
Owner 黑龙江吉地油田服务股份有限公司
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