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Viscosity stabilizer for oil-displacing polymer solution and preparation method of stabilizer

A technology of polymer solution and viscosity stabilizer, applied in the field of polymer oil flooding additives and their preparation, can solve problems such as large viscosity loss, and achieve the effects of improving stability, reducing viscosity loss rate and improving oil displacement efficiency

Pending Publication Date: 2020-01-24
DAQING PETROLEUM ADMINISTRATION +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present invention provides a polymer solution viscosity stabilizer for oil displacement, which solves the problem of large viscosity loss of the polymer solution during polymer flooding

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 2,2-dibromo-3-nitrilopropionamide 10%, 2-nitro-2-bromo-1,3-propanediol 5%, EDTA tetrasodium 20%, thiourea 5%, acetone 5%, methanol 20%, deionized water 35%. Add deionized water into the reaction kettle, heat to 45°C, add acetone and thiourea while stirring, add other materials after stirring evenly, stir for 40 minutes, and discharge and fill.

Embodiment 2

[0032] 30% isothiazolinone, 10% sodium N,N-dimethyldithiocarbamate, 15% hydroxyethylidene diphosphonic acid, 5% mercaptoethanol, 3% thiodipropionic acid, 2-hydroxyethylidene Amine 5%, deionized water 32%. Add deionized water into the reaction kettle, add other materials while stirring, stir for 40min, discharge and fill.

Embodiment 3

[0034] Dithiocyanomethane 1%, glutaraldehyde 15%, isothiazolinone 15%, polyacrylic acid 10%, sodium citrate 5%, sodium thiosulfate 7%, potassium iodide 5%, methanol 30%, deionized water 12%. Add methanol to the reaction kettle, add dithiocyanomethane while stirring, add deionized water after stirring for 20 minutes, add other materials after stirring for 5 minutes, continue stirring for 30 minutes, discharge and fill.

[0035] Verification example

[0036] The polymer solution viscosity retention rate was determined as follows:

[0037] 1. Experimental medium and instruments

[0038] (1) Medicament: embodiment 1 viscosity stabilizer, embodiment 2 viscosity stabilizer, embodiment 3 viscosity stabilizer.

[0039] (2) Medium: Sewage from a blending station of the No. 1 Oil Production Plant of Daqing Oilfield. Polymer liquor (5000mg / l) from a blending station of the No. 1 Oil Production Plant of Daqing Oilfield.

[0040] (3) Viscometer: Bolifei DV2T type, setting speed 6RPM. ...

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Abstract

The invention discloses a viscosity stabilizer for an oil-displacing polymer solution and a preparation method of the viscosity stabilizer. The stabilizer composition includes a solvent and additives;the additives are at least two selected from the group consisting of an antioxidant, an anti-salt agent and a bactericide; the antioxidant is at least one selected from the group consisting of thioethanol, thiourea, thiodipropionic acid, sodium thiosulfate, potassium iodide, 2-hydroxyethylamine and acetone; the anti-salt agent is at least one selected from the group consisting of ethylenediaminetetraacetic acid or a salt thereof, 1-hydroxyethylidene-1,1-diphosphonic acid or a salt thereof, polyacrylic acid and sodium citrate; and the bactericide is at least one selected from the group consisting of N,N-dimethyldithiocarbamic acid sodium salt, methylene dithiocyanate, 2,2-dibromo-3-cyanoacetamide, 2-nitro-2-bromo-1,3-propanediol, glutaraldehyde and isothiazolinone. The stabilizer solves the problem of large viscosity loss of the polymer solution during polymer displacement.

Description

technical field [0001] The invention relates to a polymer oil flooding additive and a preparation method thereof. Background technique [0002] After decades of research and application of polymer flooding in Daqing Oilfield, the technology has become more and more mature. However, as the scale of polymer flooding continues to expand, problems are gradually increasing. [0003] Polymer flooding is a kind of enhanced oil recovery by adding a certain amount of water-soluble polymers with high molecular weight, low filtration factor and low adsorption capacity in the injected water, thereby increasing the viscosity of the injected water, improving the oil-water injection ratio and improving the sweep efficiency. yield method. [0004] The viscosity and long-term stability of the polymer solution are the key factors affecting the oil displacement effect. Field application results show that due to factors such as salinity, bacteria, metal ions, and dissolved oxygen, the viscosi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/588
CPCC09K8/588
Inventor 李晓东张永刚欧阳武滕陆洋唐国强
Owner DAQING PETROLEUM ADMINISTRATION
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