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A kind of environment-friendly slow-release polymer scale inhibitor and preparation method thereof

A polymer and slow-release technology, which is applied in chemical instruments and methods, water treatment of special compounds, descaling and water softening, etc. It can solve the problems of affecting oil well production efficiency, reducing the inner diameter of gathering and transportation pipelines, and unstable release speed, etc. problems, achieve important economic and environmental benefits, reduce cost problems, and achieve the effects of green environmental protection and pollution-free prices

Active Publication Date: 2020-06-19
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the development of the petroleum industry, most of my country's oil fields have entered the middle and late stages of oil exploitation, and the water content of the oil well production fluid is high (over 85%, even 90%), and the concentration of calcium and magnesium in the formation water is high, which is easy to leak in the oil well pipeline. Scale formed in the pipeline and gathering pipeline, causing problems such as stuck oil well pump, reduced inner diameter of gathering pipeline, reduced flow rate, etc., seriously affecting the production efficiency of oil wells
The increasingly serious fouling problem has brought huge economic losses to oil extraction, and frequent maintenance has greatly affected the production of oil fields, and the cost of maintenance is high
In order to solve the scaling problem of oil wells and gathering and transportation pipelines, the method of adding scale inhibitors is usually used, but the traditional method of adding liquid scale inhibitors has problems such as the difficulty of dosing due to the high pressure of the oil pump, and the scale inhibitors It is brought out by the production fluid before reaching the designated position, the protection period is short, the dosing process is complicated, the dosing is frequent, and the cost is high and a series of problems
The development of high-efficiency solid slow-release antiscalants has become an urgent need for oilfield water treatment. At present, researchers have developed some solid antiscalant products, but the release rate is unstable and difficult to adjust, and they will fall off in pieces during use. cause blockage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A kind of environment-friendly slow-release polymer antiscalant, its preparation method comprises the steps:

[0034] 1) Mix the antiscalant component (carboxymethyl inulin), carrier material (polyvinyl alcohol) and additives evenly, wherein the mass percentage of each component is: carboxymethyl inulin 38%, carrier material 61%, Additive 1%; Stir fully at room temperature to mix evenly, pour the mixture into the mold and pressurize to 10MPa, hold the pressure for 20min, open the mold to eject the block preparation and dry it;

[0035] 2) Prepare sodium alginate solution with a mass concentration of 3% and polyvinyl alcohol solution with a mass concentration of 6% respectively, mix the sodium alginate solution and polyvinyl alcohol solution at a volume ratio of 2:1, and mechanically stir in an environment at 40°C Mix for 30 minutes to form a stable uniform emulsion for use as a polymer wall material solution, prepare a hydrogen chloride solution (hydrochloric acid solut...

Embodiment 2

[0038] An environmentally friendly slow-release polymer scale inhibitor, its preparation method comprises the following specific steps:

[0039] 1) Mix the anti-scaling component (carboxymethyl inulin and polyepoxysuccinic acid powder), carrier material (polyvinyl alcohol) and additives evenly, and the mass percentage of each component is: carboxymethyl inulin 25 %, polyepoxysuccinic acid powder 25%, the amount of carrier material 49.5%, the amount of additives 0.5%; fully stir at room temperature to make it evenly mixed, pour the mixture into the mold and pressurize to 20MPa, hold the pressure for 15min and then open The block preparation is ejected from the mold and dried;

[0040] 2) Prepare sodium alginate solution with a mass concentration of 3%, a polyvinyl alcohol solution with a mass concentration of 6%, and a gelatin solution with a mass concentration of 5%, and mix the sodium alginate solution, gelatin solution, and polyvinyl alcohol solution by volume ratio 2:1:1 m...

Embodiment 3

[0043] An environmentally friendly slow-release polymer scale inhibitor, its preparation method comprises the following specific steps:

[0044] 1) Mix the antiscaling components (carboxymethyl inulin, polyaspartic acid powder), carrier material (polyvinyl alcohol) and additives evenly, wherein carboxymethyl inulin is 20% by mass, polyaspartic acid Acid powder 25%, carrier material dosage 54.5%, additive dosage 0.5%, fully stir at room temperature to make it evenly mixed, pour the mixture into the mold and pressurize to 10MPa, hold the pressure for 20min, open the mold and eject the block preparation and drying;

[0045] 2) Prepare sodium alginate solution with a mass concentration of 4% and polyvinyl alcohol solution with a mass concentration of 7%, mix the sodium alginate solution and polyvinyl alcohol solution at a volume ratio of 1:1, and mechanically stir in an environment of 40°C Mix for 30 minutes to form a stable emulsion and use it as a polymer wall material solution...

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PUM

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Abstract

The invention discloses an environment-friendly slow-release polymer scale inhibitor, which is good in scale inhibition and slow release effects. The dosage of the scale inhibitor which needs to be added within a maintenance cycle can be estimated in advance according to the actual production condition of an oil well; the scale inhibitor is put into a sieve tube at the lower end of an oil-well pump of the oil well in regular repair and maintenance processes of an oil-well pipeline and a gathering pipeline; scale inhibition components are slowly dissolved and released to achieve the long-term scale inhibition effect through one-off addition when a produced liquid flows through the sieve tube, so that the long-term effective concentration can be maintained, the scale inhibiting ratio within the effective service cycle (about 90-120d) is greater than 85%, the effective release time can reach 90d or over, the protection period on the pipeline is long, and the production and maintenance cost of an oil field can be effectively reduced. The environment-friendly slow-release polymer scale inhibitor is nontoxic, harmless and degradable, and does not harm the formation and surrounding environment, and is environmentally friendly and suitable for popularization and application.

Description

technical field [0001] The invention belongs to the field of oil field water treatment agents, and mainly relates to an environment-friendly slow-release polymer scale inhibitor and a preparation method thereof. Background technique [0002] With the development of the petroleum industry, most of my country's oil fields have entered the middle and late stages of oil exploitation, and the water content of oil well production fluid is high (above 85%, even 90%), and the concentration of calcium and magnesium plasma in formation water is high, which is easy to leak in oil well pipelines. Scaling is formed in the gas and gathering pipelines, causing problems such as stuck oil pumps, reduced inner diameters of gathering and transportation pipelines, and reduced flow rates, which seriously affect the production efficiency of oil wells. The increasingly serious fouling problem has brought huge economic losses to oil production, and frequent maintenance has greatly affected the produ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F5/10
CPCC02F5/10C02F5/105C02F2103/10C02F2303/08C02F2303/22C02F2305/04
Inventor 吴仲岿程行陈超王文轩
Owner WUHAN UNIV OF TECH
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