Scale and corrosion inhibitor for oil field system

A scale and corrosion inhibitor, oilfield technology, applied in the field of water treatment, can solve problems such as secondary pollution of oilfield water, achieve high scale inhibition efficiency, improve scale and corrosion inhibition effect, and good compatibility.

Active Publication Date: 2017-03-01
安徽海瀚水处理科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adding chemical scale inhibitors to oilfield water with high salinity will reduce the generation of scale, but if you add inappropriate scale and corrosion inhibitors, it will cause secondary pollution to oilfield water. Therefore, the new phosphorus-free scale inhibitor Agent is the trend of development now

Method used

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  • Scale and corrosion inhibitor for oil field system
  • Scale and corrosion inhibitor for oil field system
  • Scale and corrosion inhibitor for oil field system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1: a kind of antiscaling and corrosion inhibitor for oil field system, its batching weight percentage is composed of:

[0029]

[0030] Wherein, the average molecular weight of the high molecular weight polymaleic anhydride is greater than 6000; the polyepoxysuccinic acid is an aqueous solution of polyepoxysuccinic acid with a mass fraction of 46%.

[0031] The steps of the preparation method of the present invention are:

[0032] (1) adding solid polymaleic anhydride and water into the reactor at room temperature and stirring for 20 to 30 minutes to fully hydrolyze the solid polymaleic anhydride;

[0033] (2) Put zinc sulfate, sodium diethyldithiocarbamate, thiourea, and disodium ethylenediaminetetraacetate in sequence in the reaction kettle, and stir for 20 to 30 minutes to fully dissolve the ingredients;

[0034] (3) Finally, polyepoxysuccinic acid is added into the reaction kettle, and the product is obtained after stirring evenly.

Embodiment 2

[0035] Embodiment 2: a kind of antiscaling and corrosion inhibitor for oil field system, its batching weight percentage is composed of:

[0036]

[0037] Wherein, the average molecular weight of the high molecular weight polymaleic anhydride is greater than 6000; the polyepoxysuccinic acid is an aqueous solution of polyepoxysuccinic acid with a mass fraction of 46%.

[0038] The steps of the preparation method of this embodiment are the same as those in Example 1.

Embodiment 3

[0039] Embodiment 3: a kind of antiscaling and corrosion inhibitor for oil field system, its batching weight percentage is composed of:

[0040]

[0041] Wherein, the average molecular weight of the high molecular weight polymaleic anhydride is greater than 6000; the polyepoxysuccinic acid is an aqueous solution of polyepoxysuccinic acid with a mass fraction of 46%.

[0042] The steps of the preparation method of this embodiment are the same as those in Example 1.

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Abstract

The invention provides a scale and corrosion inhibitor for oil field systems, which belongs to the technical field of water treatment, and its ingredients are composed of 15-30% of high molecular weight polymaleic anhydride, 5-10% of polyepoxy succinic acid, and zinc sulfate 6~9%, sodium diethyldithiocarbamate 5~10%, thiourea 5~10%, disodium edetate 1~5% and the rest water. The invention provides an efficient, phosphorus-free and environmentally friendly scale and corrosion inhibitor for oil field systems, especially suitable for oil field systems with high alkalinity, high salinity, high chloride radicals, and serious silicate scale. The components have good compatibility, synergy and complementarity, and the scale inhibition rate can be as high as 99.9%, and the corrosion inhibition rate can be as high as 98.5%.

Description

technical field [0001] The invention relates to a scale and corrosion inhibitor, in particular to a scale and corrosion inhibitor for oil field systems, and belongs to the technical field of water treatment. Background technique [0002] At present, most oilfields in my country have entered the stage of high water cut development, that is, secondary oil recovery and tertiary oil recovery. At this stage, the concentration of calcium ions, magnesium ions and bicarbonate ions in the output fluid of many oil wells in my country is high and in a state of serious saturation. When affected by factors such as temperature and pressure, they will accumulate on the equipment, which leads to the failure of oil production equipment. Severe dirt. [0003] With the injection of the tertiary oil recovery system, the phenomenon of silicate scaling in production wells is becoming more and more serious. Silica is a poorly soluble substance, its solubility decreases with increasing temperature...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F5/08C02F5/10C02F5/12C02F103/10
Inventor 龙海丽奚俊俊宁秀梅何海峰
Owner 安徽海瀚水处理科技有限公司
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