Barium-strontium scale cleaning agent and preparation method thereof

A cleaning agent and strontium scale technology are applied in the field of barium strontium scale cleaning agent and preparation, can solve the problems of low scale removal efficiency, corrosion of metal equipment and the like, and achieve the effects of simple and feasible preparation method, low cost and wide sources

Active Publication Date: 2015-10-21
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The barium sulfate and strontium sulfate descaling agents widely used at present mainly include: acid-base descaling agents, organic phosphoric ac...

Method used

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  • Barium-strontium scale cleaning agent and preparation method thereof
  • Barium-strontium scale cleaning agent and preparation method thereof
  • Barium-strontium scale cleaning agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Add 30 parts by weight of deionized water, 30 parts by weight of EDTA-2Na and 5 parts by weight of sodium hydroxide into the reaction flask, stir evenly, and react for 1 hour at a temperature of 40°C, then add them to the reaction flask in sequence Stir 20 parts by weight of Span-80 and 15 parts by weight of oxalic acid evenly, continue the heat preservation reaction for 1 hour, and naturally cool to room temperature to obtain a light yellow liquid that is the barium strontium scale cleaning agent.

Embodiment 2

[0029] Add 35 parts by weight of deionized water, 20 parts by weight of EDTA-2Na and 10 parts by weight of sodium hydroxide into the reaction flask, stir evenly, and react for 2 hours at a temperature of 50°C, then add them to the reaction flask in sequence Stir 20 parts by weight of Tween-60 and 10 parts by weight of oxalic acid evenly, continue to keep warm for 1.5 hours, and cool naturally to room temperature. The obtained light yellow liquid is the barium strontium scale cleaning agent.

Embodiment 3

[0031] 25 parts by weight of deionized water, 40 parts by weight of EDTA-2Na and DTPA-5Na mixture (wherein the weight ratio of EDTA-2Na and DTPA-5Na is 2:3), and 5 parts by weight of sodium hydroxide are added to the reaction In the bottle, stir evenly, react at 40°C for 2 hours, then add 20 parts by weight of Span-80 and 10 parts by weight of oxalic acid to the reaction bottle, stir evenly, continue to keep warm for 2 hours, and naturally cool to room temperature , the obtained light yellow liquid is barium strontium scale cleaning agent.

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Abstract

The invention discloses a barium-strontium scale cleaning agent and a preparation method thereof. The barium-strontium scale-removing agent is prepared through a reaction of, by weight, 20-40 parts of a chelating agent, 20-30 parts of a surfactant, 10-15 parts of an auxiliary agent, 5-10 parts of sodium hydroxide, and 20-35 parts of deionized water. The preparation method is simple. According to the method, deionized water, the chelating agent and sodium hydroxide are added into a reaction flask and are heated and stirred under a temperature of 40-60 DEG C; the surfactant and the auxiliary agent are sequentially added, and the temperature is maintained; and the obtained product is naturally cooled to room temperature, such that the cleaning agent is obtained. The barium-strontium scale cleaning agent has the advantages of good scale-removing performance, low toxicity, good stability, and no corrosion. With the agent, barium sulfate and strontium sulfate scales can be effectively removed, such that the agent has an important practical significance to oil field productions. The preparation method is simple and feasible, and the raw materials have wide source and low cost. Therefore, the cleaning agent and the method have good market values.

Description

technical field [0001] The invention relates to the field of oilfield chemical additives, in particular to a barium strontium scale cleaning agent and a preparation method thereof. Background technique [0002] In the process of oilfield development, due to the contamination of oil and water wells by various impurities caused by drilling fluid, downhole operations, fracturing and other reasons, insoluble scales such as barium sulfate and strontium sulfate are formed, making the reservoir extremely vulnerable to damage , resulting in stratum blockage, increased water injection pressure, decreased oil production of oil wells, or even shut down production, which has brought great harm to the formation. Due to the strong stability of barium sulfate and strontium sulfate scales, it is difficult to remove them by traditional methods. Therefore, cleaning agents for barium sulfate and strontium sulfate scales have become an indispensable part of oilfield formation. [0003] The bar...

Claims

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Application Information

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IPC IPC(8): C09K8/528
CPCC09K8/528
Inventor 王红科刘音解洪祥赵鹏靳剑霞周振良李立昌
Owner BC P INC CHINA NAT PETROLEUM CORP
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