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Barium sulfate and strontium sulfate descaling agent and preparation method thereof

A technology of descaling agent and strontium sulfate, which is applied in the direction of corrosion/scaling inhibition of treatment equipment, petroleum industry, treatment of hydrocarbon oil, etc., can solve problems such as poor effect, achieve the effect of improving descaling performance and increasing the ability of dissolving scale

Inactive Publication Date: 2014-05-28
XI'AN PETROLEUM UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the effect of using chelating agent DTPA alone to remove barium sulfate scale in oil fields is not good, but adding other chemicals can significantly improve its scale dissolution effect

Method used

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  • Barium sulfate and strontium sulfate descaling agent and preparation method thereof
  • Barium sulfate and strontium sulfate descaling agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The formula of the descaling agent is: the ethylene glycol dimethyl ether of 50% by weight; the nitrogen-containing polycarboxylic acid of 20% by weight; the salicylic acid of 10% by weight; Sodium, 15% by weight OP-10.

[0036] First add ethylene glycol dimethyl ether, nitrogen-containing polycarboxylic acid, and sodium hydroxide into the reaction kettle and stir evenly; then, heat to 40°C and keep the temperature for 1 hour; then, add salicylic acid and OP as a surfactant -10, start stirring at the same time, stop heating after stirring evenly, and after cooling to room temperature, it is the product.

Embodiment 2

[0038] The formula of descaling agent is: the mixture of 55% ethanol and isopropanol by weight, wherein the weight ratio of ethanol and isopropanol is 1:2; 20% nitrogen-containing polycarboxylic acid by weight; Be 8% citric acid; The weight percentage is 5% sodium hydroxide, the weight percentage is the mixture of 12% OP-15 and OP-10, wherein, the weight ratio of OP-15 and OP-10 is 1:1; 0.5% PESA by weight.

[0039] Add the solvent, nitrogen-containing polycarboxylic acid, and sodium hydroxide into the reaction kettle and stir evenly; then, heat to 40°C and keep the temperature for 2 hours; then, add additives and surfactants and start stirring at the same time, and stop heating after stirring evenly , after cooling to room temperature, add synergist, stir evenly and it will be the product.

Embodiment 3

[0041] The formula of descaling agent is: the isobutanol of 45% by weight, the nitrogen-containing polycarboxylic acid of 20% by weight; The oxalic acid of 12% by weight; The sodium hydroxide of 8% by weight, the percent by weight of 15% sodium lauryl sulfonate; 0.4% PESA by weight.

[0042] Add the solvent, nitrogen-containing polycarboxylic acid, and sodium hydroxide into the reaction kettle and stir evenly; then, heat to 45°C and keep the temperature for 1 hour; then, add additives and surfactants and start stirring at the same time, and stop heating after stirring evenly , after cooling to room temperature, add synergist, stir evenly and it will be the product.

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Abstract

The invention relates to a barium sulfate and strontium sulfate descaling agent and a preparation method thereof. According to the invention, a proper water soluble solvent is added into a formula which takes nitrogenous polybasic carboxylic acid as a main component, so that the components are better matched in function, and the descaling performance of the final product is further improved. In addition, the cost of the solvent is lower than that of other components, so that the cost of the final product is lowered. Raw materials for producing the descaling agent can be purchased from chemical engineering markets at home and abroad, the synthetic process is simple and the product quality is stable. The barium sulfate and strontium sulfate descaling agent for oil prepared by the invention can be suitable for water injection stratums, perforation wells, sleeve orifices, underground pumps, tubing strings, valves, transmission pipelines and the like. The descaling agent is good in compatibility and is an ideal descaling agent for removing barium sulfate and strontium sulfate for an oil field.

Description

technical field [0001] The invention relates to a descaling agent and a preparation method thereof, in particular to a barium sulfate and strontium sulfate descaling agent for oil fields and a preparation method thereof. Background technique: [0002] With the massive consumption of oil and the increasing development of oil field exploitation, most oil fields have entered the stage of water flooding oil production. However, the injected water as a formation is rich in sulfate ions, while in some oilfield formations it is rich in barium and strontium ions. Due to the chemical incompatibility between the two, water injection formations, oil casings, downhole, ground equipment and gathering and transportation Lines are fouled. Barium sulfate and strontium scale have strong stability, small solubility product, compact structure, high hardness, insoluble in acid and alkali, and are difficult to remove by traditional methods. Therefore, barium sulfate and strontium scale removers...

Claims

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Application Information

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IPC IPC(8): C10G75/00
Inventor 于洪江肖志海刘玉
Owner XI'AN PETROLEUM UNIVERSITY
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