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Starch-based scale inhibitor, preparation method and application thereof

A scale inhibitor, starch-based technology, applied in the field of starch-based scale inhibitor and its preparation, can solve problems such as poor scale inhibition effect, and achieve the effects of good circulation, significant economic and social benefits, and low cost

Active Publication Date: 2019-07-05
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in view of the scaling problem in the oilfield system, the current antiscalants are difficult to take into account the high temperature, high hardness, and high salinity of oilfield water, and the scale inhibition effect on calcium scale, magnesium scale, barium strontium scale, etc. is poor

Method used

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  • Starch-based scale inhibitor, preparation method and application thereof
  • Starch-based scale inhibitor, preparation method and application thereof
  • Starch-based scale inhibitor, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The preparation method of the starch-based antiscalant of the present embodiment, the steps are specifically:

[0028] 1. Prepare materials

[0029] Calculated by producing 1000 parts by mass of antiscalant, the amount (parts by mass) of each component is as follows:

[0030]

[0031] Dissolve the cornstarch in part of the water (this part of water is 70% of the total water yield) according to the above-mentioned amount of raw materials, make a beating, and make the cornstarch solution for subsequent use;

[0032] Dissolve acrylic acid in part of water according to the above-mentioned amount of raw materials to prepare an acrylic acid solution for subsequent use;

[0033] Dissolve maleic acid in part of the water according to the above-mentioned amount of raw materials to prepare maleic acid solution for subsequent use;

[0034] Dissolve ammonium persulfate and urea in part of the water according to the above-mentioned amount of raw materials prepared to make a com...

Embodiment 2

[0039] The preparation method of the starch-based antiscalant of the present embodiment, the steps are specifically:

[0040] 1. Prepare materials

[0041] Calculated by producing 1000 parts by mass of antiscalant, the amount (parts by mass) of each component is as follows:

[0042]

[0043] Carboxymethyl starch is dissolved in part of water (this part of water is 70% of the total water yield) according to the above-mentioned amount of raw materials prepared, beating, and carboxymethyl starch solution is made, for subsequent use;

[0044] Dissolve acrylamide in part of the water according to the above-mentioned amount of preparation to make an acrylamide solution, and set aside;

[0045] Dissolve maleic acid in part of the water according to the above-mentioned amount of raw materials to prepare maleic acid solution for subsequent use;

[0046] Dissolve ammonium persulfate and thiourea in part of the water according to the above-mentioned amount of raw materials prepared ...

Embodiment 3

[0051] The preparation method of the starch-based antiscalant of the present embodiment, the steps are specifically:

[0052] 1. Prepare materials

[0053] Calculated by producing 1000 parts by mass of antiscalant, the amount (parts by mass) of each component is as follows:

[0054]

[0055]

[0056] Dissolve the cornstarch in part of the water (this part of water is 70% of the total water yield) according to the above-mentioned amount of raw materials, make a beating, and make the cornstarch solution for subsequent use;

[0057] Dissolve acrylic acid in part of water according to the above-mentioned amount of raw materials to prepare an acrylic acid solution for subsequent use;

[0058] Dissolve maleic acid in part of the water according to the above-mentioned amount of raw materials to prepare maleic acid solution for subsequent use;

[0059] Dissolve ammonium persulfate and urea in part of the water according to the above-mentioned amount of raw materials prepared t...

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Abstract

The invention provides a starch-based scale inhibitor, a preparation method and application thereof. The preparation method of the starch-based scale inhibitor includes: in the presence of a compositeinitiator, subjecting starch to polymerization reaction with a first monomer and a second monomer, wherein the composite initiator includes ammonium sulfate and a reducing agent, the first monomer isacrylic acid or acrylamide, and the second monomer is maleic acid. The starch-based scale inhibitor provided by the invention has a good scale inhibition effect on high temperature, high hardness andhigh salinity oilfield water.

Description

technical field [0001] The invention relates to a scale inhibitor, in particular to a starch-based scale inhibitor and its preparation method and application. Background technique [0002] With the increase of water produced in oilfields, water scaling in oilfields is an inevitable problem in oilfield production. Scaling is very harmful to oil fields. Scale deposits in oil production and gathering and transportation systems will not only increase the resistance of fluid flow, thereby increasing energy consumption, but also cause corrosion under the scale and affect normal production. In addition, the deposition of scale in formation water will also It will cause problems such as channel blockage. Therefore, fouling is becoming an urgent problem to be solved in oil fields. [0003] There are various factors that cause scaling in oilfield systems, mainly including scaling caused by the incompatibility of produced fluid and reinjection water, and scaling caused by the differe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00C08F220/06C08F220/56C08F222/02C02F5/12C02F103/10
CPCC08F251/00C02F5/125C02F2103/10C08F220/06C08F220/56C08F222/02
Inventor 黎真周理志白晓飞梁凌熏闫峰何强宋文文陈德飞熊新民钟诚谢英王鹏陈庆国王方智
Owner PETROCHINA CO LTD
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