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Dispersing solubilizer for insoluble scale in oil field and preparation method of dispersing solubilizer

A technology of insoluble scale and solubilizing agent, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of increasing solubility and poor solubilizing effect, and achieve increased scale dissolution speed, good wettability, and molecular Strong vibration effect

Active Publication Date: 2022-05-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sodium formate has a poor solubilizing effect on calcium carbonate, and sodium hydroxide turns calcium carbonate into calcium hydroxide to increase solubility, but the pH value must be greater than 11

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Add appropriate amount of 3-ethylpyridine and 3-picoline-N-oxide in the container in turn, the mass ratio is: W(3-ethylpyridine):W(3-picoline-N-oxide) =80:20. Stir continuously at room temperature at a speed of 110 rpm for 60 minutes to obtain a solubilizer for dispersing refractory oilfield scale.

[0023] According to the above-mentioned oilfield refractory scale dispersing solubilizer of 1.5% by mass concentration, 5.5% of the above-mentioned tetrasodium ethylenediaminetetraacetic acid, 1.5% tetrakis hydroxymethyl phosphorus sulfate and the balance water are prepared into 100g of oilfield refractory scale dispersion Add 1 g of calcium sulfate powder to the solution, and the scale dissolution rate is 95% in 1 hour at 30°C.

Embodiment 2

[0025] Add appropriate amount of 3-picoline and 2,3-lutidine-N-oxide in sequence in the container, the mass ratio is: W(3-picoline):W(2,3-lutidine -N-oxide) = 85:15. Stir continuously at room temperature at a speed of 110 rpm for 60 minutes to obtain a solubilizer for dispersing refractory oilfield scale.

[0026] According to the above-mentioned oilfield refractory scale dispersing solubilizer of 1.5% by mass concentration, 5.5% tetrasodium edetate, 1.5% tetrakis hydroxymethyl phosphorus sulfate and the balance water, 100g of oilfield refractory scale dispersing solubilizer is prepared. Solution, 1 g of strontium sulfate powder was added therein, and the scale dissolution rate was 90% in 72 hours at 60°C.

Embodiment 3

[0028] Add appropriate amount of 2-hydroxy-6-methylpyridine and 2-methylpyridine-N-oxide to the container successively, the mass ratio is: W(2-hydroxy-6-methylpyridine):W(2-methylpyridine Basepyridine-N-oxide)=83:17. Stir continuously at room temperature at a speed of 110 rpm for 60 minutes to obtain a solubilizer for dispersing and refractory oilfield scale.

[0029] According to the above-mentioned oilfield refractory scale dispersing solubilizer of 1.5% by mass concentration, 5.5% tetrasodium edetate, 1.5% tetrakis hydroxymethyl phosphine sulfate and the balance water are prepared into 100g oilfield refractory scale dispersing solubilizing solution , 1 g of barium sulfate powder was added therein, and the scale dissolution rate was 82% in 72 hours at 60°C.

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PUM

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Abstract

The invention discloses a preparation method of an oil field indissolvable scale dispersing solubilizer, the oil field indissolvable scale dispersing solubilizer comprises pyridine compounds and pyridine-N-oxide compounds, the mass ratio of the pyridine compounds to the pyridine-N-oxide compounds is (80-85): (15-20), the oil field indissolvable scale dispersing solubilizer is matched with an oil field common chelating agent for use, the temperature is higher than 30 DEG C, and the oil field indissolvable scale dispersing solubilizer is prepared. The scale dissolving rate of insoluble scales such as calcium sulfate, strontium sulfate and barium sulfate is not lower than 81%, and the scale dissolving performance is improved.

Description

technical field [0001] The invention belongs to the technical field of oil recovery engineering in the petroleum industry, and in particular relates to a solubilizer for dispersing refractory scale in oil fields and a preparation method thereof. Background technique [0002] Scaling problems generally exist in the process of oil and gas extraction, water injection and drainage. Formation water or reinjection water often contains a certain amount of Ca 2+ , Mg 2+ 、Ba 2+ 、Sr 2+ and other cations, and also contains a certain amount of CO 3 2- , SO 4 2- Isoanions, due to the change of thermodynamic factors such as temperature and pressure, the change of dynamic factors such as flow velocity and flow form, and the compatibility between reinjection water and formation water, etc., cause fouling, reduce production efficiency, and even stop production and scrap oil and gas wells ; In addition, pipeline scaling and corrosion are also likely to cause problems such as perforati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/528
CPCC09K8/528
Inventor 虞建业张鑫包敏新吕红梅
Owner CHINA PETROLEUM & CHEM CORP
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