Washing liquid used for removing iron sulfides scale, and preparation method and applications thereof

A technology of cleaning liquid and clear water, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of poor biodegradability of cleaning liquid, hidden environmental and safety hazards, and short action time, so as to eliminate safety and environmental hidden dangers, Promotes dissolution and high clearance

Active Publication Date: 2018-01-05
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Chlorine dioxide in the cleaning liquid used to remove iron sulfide scale provided by the prior art is easy to decompose, the action time is short, and it is easy to cause secondary pollution, and the cleaning liquid has poor biodegradability and low scale inhibition rate
Simultaneously easy secondary H 2 S gas causes environmental and safety hazards

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] This embodiment provides a cleaning solution for removing iron sulfide scale, the cleaning solution includes the following components in mass percentage: tetrakis hydroxymethyl phosphorus sulfate 20%, ammonium chloride 4%, ammonium persulfate 4%, The sulfur removal dispersant is 3%, the balance is water, and the pH value of the cleaning solution is 3. Among them, the sulfur removal dispersant can be prepared by the following method: put 15kg of 1,3,5-s-triazine, 325kg of glycerol and 525kg of clear water in a 1000L enamel reaction kettle, heat to 35°C, stir for 25min, and then add 30kg Sodium diethylenetriaminepentamethylene phosphonate, 10kg sodium dodecylbenzenesulfonate and 150kg clear water, then lower the temperature of the reactor to 25°C and stir for 25min under constant temperature conditions to obtain a sulfur removal dispersant.

[0036] The cleaning solution provided in this embodiment is prepared by the following method:

[0037] Add ammonium chloride, ammo...

Embodiment 2

[0039] This embodiment provides a cleaning solution for removing iron sulfide scale, including the following components in mass percentage: tetrakis hydroxymethyl phosphorus sulfate 25%, ammonium sulfate 3%, ammonium persulfate 1%, sulfur removal dispersant 3%, the balance is water, and the pH value of the cleaning solution is 2.8. Among them, the sulfur removal dispersant can be prepared by the following method: put 16kg of 1,3,5-s-triazine, 300kg of dodecanol and 560kg of clear water in a 1000L enamel reaction kettle, heat to 40°C, stir for 30min, and then add 20kg Sodium diethylenetriaminepentamethylene phosphonate, 10kg sodium dodecylbenzenesulfonate and 100kg clear water, then lower the temperature of the reactor to 30°C, and stir for 30min under constant temperature conditions to obtain a sulfur-removing dispersant.

[0040] The cleaning solution provided in this embodiment is prepared by the following method:

[0041] Add ammonium sulfate, ammonium persulfate, and wate...

Embodiment 3

[0043] This embodiment provides a cleaning solution for removing iron sulfide scale, including the following components in mass percentage: 15% tetrakishydroxymethyl phosphorus chloride, 6% ammonium nitrate, 8% sodium persulfate, sulfur removal dispersion 5% agent, the balance is water, and the pH value of the cleaning solution is 3.5. Among them, the sulfur removal dispersant can be prepared by the following method: put 14kg of 1,2,4-triazine, 350kg of glycerol and 540kg of water in a 1000L enamel reaction kettle, heat to 45°C, stir for 35min, and then add 24kg Sodium diethylenetriaminepentamethylene phosphonate, 12kg sodium dodecylsulfonate and 120kg clear water, then lower the temperature of the reactor to 32°C and stir for 32min under constant temperature conditions to obtain a sulfur removal dispersant.

[0044] The cleaning solution provided in this embodiment is prepared by the following method:

[0045] Add ammonium nitrate, sodium persulfate, and water in the above p...

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Abstract

The invention discloses a washing liquid used for removing iron sulfides scale, and belongs to the field of chemical descaling. The washing liquid comprises 5 to 30% of an organic phosphorus chelatingagent, 1 to 6% of an ammonium salt chelating auxiliary agent, 2 to 8% of an inorganic oxidizing agent, 2 to 6% of a sulfur removing dispersant, and the balance water; the organic phosphorus chelatingagent is Tetrakis hydroxymethyl phosphonium sulfate and / or Tetrakis(hydroxymethyl)phosphonium Chloride. The sulfur removing dispersant is prepared via following steps: triazine, a polyol, and clear water are introduced into a reaction vessel, an obtained mixture is heated to 30 to 50 DEG C, and is reacted for 20 to 40min with stirring; Diethylenetriaminepenta(methylenephosphonicacid) sodium salt,an anionic surfactant, and clear water are added, the temperature is reduced to 25 to 35 DEG C, and stirring reaction is carried out under constant temperature conditions for 25 to 35min; wherein themass ratio of triazine, the polyol, and clear water is controlled to be 1:10-25:35-50, the mass ratio of the anionic surfactant, Diethylenetriaminepenta(methylenephosphonicacid) sodium salt, and clear water is controlled to be 1:1-4:10-24, and the mass amount of the anionic surfactant accounts for 0.5 to 4% of that of the sulfur removing dispersant. The washing liquid is high in clearing rate andscale inhibition rate, is safe, is friendly to the environment, and is high in biodegradability.

Description

technical field [0001] The invention relates to the field of chemical descaling, in particular to a cleaning solution for removing iron sulfide scales, a preparation method and application thereof. Background technique [0002] In the oil field water injection system, due to the difference in the composition of the injected liquid and the original liquid in the oil layer, the chemical balance of the liquid in the oil layer is destroyed and a chemical reaction occurs, which further corrodes steel equipment and pipelines. For example, the ionic species contained in the oilfield injection water are different from those in the oil reservoir, and the oilfield injection water also contains H 2 S dissolved gas, sulfate-reducing bacteria and other harmful fungi, which make the steel equipment and pipelines in oil wells prone to electrochemical corrosion or sulfur corrosion. In addition, the temperature of oilfield water injection is generally higher than that of the oil layer, whic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/528
Inventor 胡书宝谢刚闫海俊巨登峰高乃煦姜伟祺刘萌巩峰
Owner PETROCHINA CO LTD
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