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Oil and gas field gathering and transportation pipeline corrosion inhibitor capable of resisting corrosion of high-calcium produced water

A technology for gathering and transporting pipelines and corrosion inhibitors, which is applied in the direction of earthwork drilling, drilling compositions, wellbore/well components, etc. Development and application issues, to achieve the effect of good corrosion inhibition, stable structure, and simple preparation method

Active Publication Date: 2020-09-01
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

Ionic liquid corrosion inhibitors are environmentally friendly corrosion inhibitors that do not add synergists and solvents. At present, the most commonly used ionic liquid corrosion inhibitors are imidazole-based ionic liquids, but a single imidazole-based ionic liquid has a single molecular shape. The formed corrosion inhibitor film has local holes, the density of the corrosion inhibitor film is not high, and the corrosion inhibition effect is not ideal, especially the local corrosion caused by high calcium ion content, the corrosion inhibition effect is greatly reduced, which greatly affects its future development and development. application

Method used

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  • Oil and gas field gathering and transportation pipeline corrosion inhibitor capable of resisting corrosion of high-calcium produced water

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preparation example Construction

[0043] The preparation method of the anti-high-calcium produced water corrosion inhibitor of the present invention is as follows: in terms of mass percentage, 70-95% of the large-molecular imidazole-based ionic liquid and 5-30% of the small-molecular imidazole-based ionic liquid are evenly mixed. .

[0044] The measuring method of corrosion inhibitor corrosion rate in each embodiment among the present invention is:

[0045] Medium composition: CaCl 2 : 100g / L, CO 2 Partial pressure 0.5MPa, total pressure 5MPa;

[0046] Test temperature: 50°C;

[0047] Test time: 96 hours;

[0048] Test material: L245 steel.

[0049] First polish the L245 steel, then wash it with petroleum ether, acetone and ethanol, dry it, weigh it, put the prepared solution in the reaction vessel with a reflux device, add 100ppm of the prepared corrosion inhibitor, stir evenly, and weigh it. The heavy L245 steel was hung into the reaction vessel, and the temperature was raised to 50°C. After stabilizin...

Embodiment 1

[0051] The macromolecular ionic liquid was prepared by the following process: Add 25mmol N-methylimidazole and 45mmol toluene into a three-necked flask equipped with a condenser and a dropping funnel, stir evenly with electromagnetic, heat to 85°C, and use a speed of 15mL / min 27.5 mmol of 1-bromododecane was added dropwise, and after reacting for 23 hours, the solution was evaporated to remove the solvent to obtain a yellow viscous liquid. The above liquid was mixed with 27.5mmol of NaBF 4 Add 50 mmol of acetone into a single-necked round-bottomed flask with a condensing reflux device, react with a magnetic stirrer at a speed of 180 rpm for 11 hours at room temperature, and then filter to remove the white precipitate NaBr. Add an appropriate amount of dichloromethane to the filtrate to form a white precipitate , filtered, acetone and dichloromethane were removed by rotary evaporation, and vacuum-dried at 40°C for 23 hours to obtain 3-dodecyl-1-methylimidazolium tetrafluorobora...

Embodiment 2

[0055] The macromolecular ionic liquid was prepared by the following process: add 25mmol N-methylimidazole and 45mmol toluene into a three-necked flask equipped with a condenser tube and a dropping funnel, stir evenly with electromagnetic, heat to 85°C, and add dropwise at 15mL / min 27.5 mmol of 1-bromohexadecane was reacted for 23 hours, and the solution was evaporated to remove the solvent to obtain a yellow viscous liquid. The above liquid was mixed with 27.5mmol NaPF 6 And 50mmol of acetone was added to a single-necked round bottom flask with a condensing reflux device, magnetically stirred at room temperature and reacted at a speed of 180 rpm for 11h, then filtered to remove the white precipitate NaBr, and 20mL of dichloromethane was added to the filtrate to form a white precipitate, and filtered , Rotary evaporation for 3h to separate acetone and dichloromethane, 40 ° C vacuum drying to obtain 3-hexadecyl-1-methylimidazolium hexafluorophosphate.

[0056] The small molecu...

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Abstract

The invention discloses an oil and gas field gathering and transportation pipeline corrosion inhibitor capable of resisting the corrosion of high-calcium produced water. The gathering and transportation pipeline corrosion inhibitor comprises the following components in percentage by mass: 70 to 95 percent of macromolecular imidazoline-based ionic liquid and 5 to 30 percent of micromolecular imidazoline-based ionic liquid. The corrosion inhibitor disclosed by the invention is an environment-friendly corrosion inhibitor for inhibiting the corrosion of the high-calcium produced water in an oil and gas field gathering and transportation system, and has the characteristics of better corrosion inhibition effect, no solvent, environment friendliness, good water solubility and small dosage.

Description

technical field [0001] The invention belongs to the technical field of petrochemical industry, and in particular relates to a corrosion inhibitor for gathering and transporting pipelines of oil and gas fields resistant to corrosion of high-calcium produced water. Background technique [0002] The salinity of produced water from oil and gas wells is generally high, except for Na + 、K + , Cl - In addition to other soluble ions, often contain a higher content of calcium ions (Ca 2+ ), and even Ca 2+ The content reaches 40000ppm. CO 2 It often exists in oil and gas as a component of natural gas or petroleum associated gas, so the high content of Ca 2+ Easy to generate carbonate, and corrosion product FeCO 3 Together, they are deposited on the surface of pipes and equipment in the form of scale, causing corrosion under scale, etc., causing serious local corrosion of steel, causing corrosion failure of pipes and equipment, and may also cause blockage, making problems such a...

Claims

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Application Information

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IPC IPC(8): C09K8/54
CPCC09K8/54C09K2208/32
Inventor 范磊高源张娟涛吕玉海尹成先刘贵宾王远王浩连宇博
Owner BC P INC CHINA NAT PETROLEUM CORP
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