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Preparation method of calcium, strontium and barium scale inhibitor

A technology of scale inhibitor, strontium barium, which is applied in the field of preparation of calcium strontium barium scale inhibitor, can solve the problems of narrow trial range and weak anti-scaling ability

Inactive Publication Date: 2014-09-17
JIANGSU JIAHUA ADVANCED MATERIALS TECH
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  • Abstract
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AI Technical Summary

Problems solved by technology

At present, scale inhibitors generally have a narrow trial range and weak anti-scaling ability. The calcium strontium barium scale inhibitor that can prevent both carbonate scaling and sulfate scaling and has a good anti-scaling effect is the purpose of the present invention.

Method used

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  • Preparation method of calcium, strontium and barium scale inhibitor

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Embodiment 1）

[0014] see figure 1 , A preparation method of calcium, strontium and barium scale inhibitor, adding 80-120kg of organic acid anhydride, 15-35kg of acetate, 150-250kg of deionized water into a 500L reactor, adding 0.5-1kg of initiator, and heating to 80-100℃, Add 30-80kg of organic acid dropwise, react for 6-8 hours; add 5-25kg of sodium hydroxide, cool to room temperature, add 50-100kg of complexing agent, stir for 30 minutes, and filter out.

[0015] The organic acid anhydride is one or a mixture of acetic anhydride, tartaric acid, citric acid, maleic anhydride, and phthalic anhydride.

[0016] Acetate is one or a mixture of ethyl acetate, methyl acetate, propyl acetate, or vinyl acetate.

[0017] The initiator is one or two of benzoyl peroxide, ammonium persulfate, or azobisisobutyronitrile.

[0018] The organic acid is one or a mixture of acrylic acid or methacrylic acid or styrene sulfonic acid or epoxysuccinic acid or aspartic acid.

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Abstract

The invention relates to a preparation method of a calcium, strontium and barium scale inhibitor. The method comprises the following steps: adding 80-120kg of organic acid anhydrides, 15-35kg of acetate and 150-250kg of deionized water into a 500L reaction kettle, adding 0.5-1kg of an initiator, heating to 80-100DEG C, adding 30-80kg of an organic acid in a dropwise manner, and reacting for 6-8h; and adding 5-25kg of sodium hydroxide, cooling to room temperature, adding 50-100kg of a complexing agent, stirring for 30min, filtering, and discharging. The introduction of the complexing agent with a high complexation effect enables barium and strontium ions in oilfield produced water to be effectively complexed, and the generation of sulfate scales is prevented by using complexation solubilizing, dispersion and crystal distortion effects.

Description

Technical field [0001] The invention relates to a preparation method of calcium, strontium and barium scale inhibitor. Background technique [0002] During oilfield production, water is inseparable. Due to environmental impacts and mining conditions, oilfield water will generate sediments under chemical and physical changes. These sediments will accumulate on the surface of tubing casing and various equipment and will cause scale, which will seriously affect Oil and gas production in an oil field can even cause oil and gas wells to stop production in severe cases. The current scales mainly include carbonate scale and sulfate scale. Carbonate scale is easily removed by acidification, but sulfate scale, especially barium sulfate and strontium sulfate, is difficult to remove by general methods. At present, chemical anti-sulphate scale technology and supersaturated carbonate reaction combined with pickling and descaling are mainly used. Nowadays, scale inhibitors generally have a n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F5/10C08F222/06C08F218/08C08F220/06C08F212/14
Inventor 蒋明王栋李敏
Owner JIANGSU JIAHUA ADVANCED MATERIALS TECH
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