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Corrosion inhibitor for treating oilfield produced water and preparation method thereof

A technology of corrosion inhibitor and produced water, applied in the field of corrosion inhibitor for oilfield produced water treatment and its preparation

Active Publication Date: 2012-09-12
唐山冀油瑞丰化工有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] The synthesis of various oleic acid imidazolines in the prior art all uses aluminum oxide as a catalyst, and the reaction time needs 24h; the synthesis reaction time is long, and the corrosion inhibition rate lower cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1 (raw material by weight)

[0034] Add 400kg of diethylenetriamine, 700kg of oleic acid, 20kg of catalyst heteropolyacid, and 1000kg of water-carrying agent xylene into the reactor, heat to 150°C under constant stirring, keep the reaction temperature at 140~220°C, and reflux for 5~ After 8 hours, imidazoline oleate was obtained.

[0035] Under normal temperature conditions, add 400 kg of imidazoline oleate, 25 kg of catalyst hydrochloric acid, and 60 kg of formaldehyde into the reactor, stir for 0.5-4 hours, continue to add 70 kg of isopropanol solution of phosphorous acid into the reactor, stir for 1-2 hours, and then add hydrochloric acid Regulate pH to be 6, obtain 600kg concentration and be 90% corrosion inhibitor for oilfield produced water.

Embodiment 2

[0036] Example 2 Corrosion inhibition rate test of corrosion inhibitor

[0037] The corrosion inhibition rate test was carried out in accordance with the standard SY / T 5273-2000 "Corrosion Inhibitor Performance Evaluation Method for Oilfield Produced Water" standard. Temple produced water, the test temperature is 50°C, the dosing concentration is 100mg / L, the test results are shown in Table 1

[0038] Table 1 Test results of corrosion inhibition rate of corrosion inhibitors

[0039] water sample sample Corrosion rate / mm / a Corrosion inhibition rate / % Gao Yilian produced water / 0.05364 / Example 1 0.01386 74.2 Phosphate Hydroxy Acid Type 0.04629 13.7 Double quaternary ammonium salt type 0.03031 43.5 Alkyl Phosphate Type 0.02989 44.3 Mannich base type 0.03899 27.3 Laoye Temple produced water / 0.07056 / Example 1 0.01373 80.5 Phosphate Hydroxy Acid Type 0.06374 9.7 ...

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PUM

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Abstract

The invention provides a corrosion inhibitor for treating oilfield produced water, which comprises an imidazoline group and a phosphonic acid group. 350 to 450 parts of diethylene triamine, 650 to 750 parts of oleic acid, 15 to 25 parts of heteropolyacid serving as a catalyst and 950 to 1100 parts of dimethyl benzene serving as a water-carrying agent are added to a reactor by weight, stirred and heated to a temperature of 150 DEG C, the reaction temperature is kept at 140 to 220 DEG C, and after a reaction product flows back for 5 to 8 hours, oleic acid imidazoline is obtained. Under a normaltemperature condition, 350 to 450 parts of oleic acid imidazoline, 20 to 30 parts of hydrochloric acid serving as a catalyst and 55 to 65 parts of formaldehyde are added to the reactor and stirred for 0.5 to 4 hours, 65 to 75 parts of isopropyl alcohol solutions of phosphorous acid is added to the reactor and stirred for 1 to 2 hours, then pH value of a reaction product is regulated to 6 by usinghydrochloric acid, and a finished product of the corrosion inhibitor with for treating the oilfield produced water, which has a concentration of 90 percent, is obtained. The corrosion inhibitor has ahigh corrosion inhibition rate, is easy to be dissolved in water and is modified by using cheap raw materials; and the cost for preparing the corrosion inhibitor is low.

Description

technical field [0001] The invention relates to an oilfield chemical agent used for oilfield produced water treatment, in particular to a corrosion inhibitor for oilfield produced water treatment and a preparation method thereof. Background technique [0002] Corrosion of oilfield produced water shortens the service time of oil transportation, water supply and water injection pipelines and equipment, resulting in great waste. At present, the method of adding chemical corrosion inhibitors is mainly used for corrosion prevention. Corrosion inhibitors are divided into inorganic corrosion inhibitors and organic corrosion inhibitors. According to the characteristics of oil fields, organic corrosion inhibitors are mainly used. The main factors causing corrosion in oilfield produced water are carbon dioxide, hydrogen sulfide, chloride ions, various salts, dissolved oxygen and bacteria, etc. At present, imidazoline organic corrosion inhibitors are mainly used to prevent corrosion ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F11/167C07F9/6506
Inventor 陈勇陈永生赵永刚
Owner 唐山冀油瑞丰化工有限公司
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