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Scale inhibitor for oilfield water injection

A technology for oil field water injection and scale inhibitor, which is used in descaling and water softening, complex/solubilizer treatment, water/sludge/sewage treatment, etc. speed and other issues, to achieve the effect of good scale inhibition effect, not easy to hydrolysis, and excellent corrosion inhibition effect.

Inactive Publication Date: 2017-02-15
WEIHAI YUNRUI INFORMATION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although commercially available compound scale inhibitors have a certain scale inhibition effect on produced water, the effect is not good due to the influence of the formula of the scale inhibitor itself, and the scaling rate in produced water has not been weakened. Inhibition of scale inhibition
And it contains heavy metal salts, which will pollute the groundwater to a certain extent.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1, amino trimethylene phosphonic acid 100g, hydroxyethylidene diphosphonic acid 200g, sodium ethylenediamine tetramethylene phosphonate 200g, ammonium molybdate 800g, EDTA 600g, polyaspartic acid 1000g, chitosan 100g, water 2000g serving. Prepared according to the preparation method described in the technical scheme.

Embodiment 2

[0018] Embodiment 2, aminotrimethylene phosphonic acid 300g, hydroxyethylidene diphosphonic acid 100g, sodium ethylenediamine tetramethylene phosphonate 400g, ammonium molybdate 400g, EDTA 1000g, polyaspartic acid 600g, chitosan 300g, water 3500g. Prepared according to the preparation method described in the technical scheme.

Embodiment 3

[0019] Embodiment 3, amino trimethylene phosphonic acid 150g, hydroxy ethylidene diphosphonic acid 180g, sodium ethylenediamine tetramethylene phosphonate 230g, ammonium molybdate 760g, EDTA 680g, polyaspartic acid 960g, chitosan 120g, water 2300g. Prepared according to the preparation method described in the technical scheme.

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PUM

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Abstract

The invention belongs to the technical field of oilfield water treatment and relates to a scale inhibitor for oilfield water injection. The technical scheme includes that the scale inhibitor for oilfield water injection is characterized by being prepared from, by weight, 1-3 parts of amino trimethylene phosphonic acid, 1-2 parts of etidronic acid, 2-4 parts of ethylenediamine tetra(methylene phosphonic acid) sodium, 4-8 parts of ammonium molybdate, 6-10 parts of EDTA (ethylene diamine tetraacetic acid), 6-10 parts of polyaspartic acid, 1-3 parts of chitosan and 20-35 parts of water. The scale inhibitor for oilfield water injection is environment friendly.

Description

[0001] Technical field: The present invention relates to a scale inhibitor for oilfield water injection, which belongs to the technical field of oilfield water treatment. [0002] Background technique: [0003] Water flooding is the main method of oilfield development in my country. The main source of water injection is the associated water separated from the oilfield produced fluid. The oilfield associated water has complex components, high salinity, high content of bacteria and microorganisms, and dissolved corrosive gases such as carbon dioxide, hydrogen sulfide, and oxygen, which can easily cause corrosion and scaling of the water injection system. With the increase of oil field production time, the quality of injection water is deteriorating, and the corrosion and scaling are also becoming more and more serious, seriously affecting the normal production of oil fields and causing huge economic losses. In order to slow down the corrosion and scaling of the oilfield water in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F5/12C02F5/14C02F5/08
CPCC02F5/145C02F5/125
Inventor 孙爱梅
Owner WEIHAI YUNRUI INFORMATION TECH CO LTD
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