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Polyethylene glycol bridged cyclodextrin corrosion inhibitor and preparation method thereof

A polyethylene glycol and cyclodextrin technology, which is applied in the field of polyethylene glycol bridged cyclodextrin corrosion inhibitor and preparation, can solve problems such as hidden safety hazards, economic losses, and deepening of the corrosion degree of oil pipelines, and achieve adsorption capacity. Strong, high corrosion inhibition efficiency, simple and feasible preparation method

Inactive Publication Date: 2016-03-30
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the increase of oil field production time and the continuous deterioration of water quality, the corrosion of oil pipelines has deepened, causing serious safety hazards and economic losses

Method used

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  • Polyethylene glycol bridged cyclodextrin corrosion inhibitor and preparation method thereof
  • Polyethylene glycol bridged cyclodextrin corrosion inhibitor and preparation method thereof
  • Polyethylene glycol bridged cyclodextrin corrosion inhibitor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The first step: preparing chlorinated polyethylene glycol 400.

[0014] First put 21.5ml of polyethylene glycol 400 solution (polyethylene glycol 400 is liquid, 400 is its average molecular weight, no need to dissolve with dimethyl sulfoxide) in a 250mL dry three-necked flask, drop Add 8.72ml of thionyl chloride, and control the reaction temperature to -1°C in an ice-water bath, and keep the temperature of the reactor below 0°C during the dropwise addition of thionyl chloride. The reflux reaction time was 7 hours, and the resulting pale yellow mixture was distilled in a rotary evaporator in a fume hood for 48 hours to remove reaction by-products such as hydrogen sulfide and hydrochloric acid to obtain chlorinated polyethylene glycol 400.

[0015] The second step: preparing polyethylene glycol 400 bridged β-cyclodextrin.

[0016] Put 6.6g of chlorinated polyethylene glycol 400 prepared in the previous step and 34.05g of β-cyclodextrin (molar ratio 1:2) into an ultrasoni...

Embodiment 2

[0021] Infrared Spectra of Polyethylene Glycol Bridged Cyclodextrin

[0022] The infrared spectrum of the polyethylene glycol 400 bridged β-cyclodextrin obtained by Example 1 is shown in figure 1 According to the spectrum analysis, the obtained target product is basically consistent with the expected product.

Embodiment 3

[0024] The experimental material is Q235 carbon steel, the chemical composition is (W%): C(0.14-0.22), Mn(0.30-0.65), Si(≤0.30), S(≤0.05), P(≤0.045), and the rest are Fe. The corrosion medium is 0.5mol / L hydrochloric acid solution. The Q235 carbon steel was respectively immersed in different concentrations of polyethylene glycol bridged cyclodextrin corrosion inhibitors, the temperature was 25°C, and the pressure was normal pressure. The impedance spectra and polarization curves were measured by CHI604D electrochemical workstation produced by Shanghai Chenhua Instrument Co., Ltd. Obtained through experiments: when the polyethylene glycol 400 bridged β-cyclodextrin prepared in Example 1 is added at a concentration of 105 mg / L, the highest corrosion inhibition efficiency is 92.25%.

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Abstract

The invention relates to a polyethylene glycol bridging cyclodextrin corrosion inhibitor for preventing corrosion of steel pipelines of an oil-gas field and a preparation method of the polyethylene glycol bridging cyclodextrin corrosion inhibitor. The polyethylene glycol bridging cyclodextrin corrosion inhibitor can prevent the pipelines of the oil-gas field from being corroded to improve the economical efficiency and safety of oil production. The technical scheme is as follows: the corrosion inhibitor has a chemical name of polyethylene glycol bridging cyclodextrin. The preparation method of the corrosion inhibitor comprises the steps of firstly, adding polyethylene glycol and thionyl chloride to react for 7 hours at -10 DEG C so as to prepare chlorinated polyethylene glycol; then adding cyclodextrin into the product of the previous step, uniformly performing ultrasonic oscillation, then adding sodium hydroxide and sodium dodecylbenzene sulfonated as catalysts, and stirring to react for 7-8 hours at 60 DEG C under the protection of nitrogen, thereby preparing the polyethylene glycol bridging cyclodextrin. The preparation method of the polyethylene glycol bridging cyclodextrin is simple, mild in synthetic condition and simple in equipment, and the obtained product has good adsorbability and dispersity to steel pipelines, is high in corrosion inhibition efficiency, and is used for corrosion prevention of oil-gas field pipelines.

Description

technical field [0001] The invention relates to a polyethylene glycol bridged cyclodextrin corrosion inhibitor used for preventing corrosion of steel pipelines in oil and gas fields and a preparation method thereof. Background technique [0002] Fracturing and acidizing are important methods to enhance the recovery of oil and gas fields. However, drilling wastewater and fracturing acidification wastewater are major sources of pollution for oil and gas companies. At present, the technological development of water treatment is not perfect, and the acidic ions and dissolved salts contained in wastewater will corrode steel pipes. With the increase of oil field exploitation time and the continuous deterioration of water quality, the corrosion degree of oil pipelines has deepened, causing serious safety hazards and economic losses. [0003] At present, the main anti-corrosion measures adopted for domestic oilfield water injection pipeline systems include: chemical anti-corrosion...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F11/173
Inventor 刘圆邹长军胡绪则
Owner SOUTHWEST PETROLEUM UNIV