Corrosion inhibitor for sour oil and gas fields

A corrosion inhibitor, oil and gas field technology, applied in the field of metal anti-corrosion, can solve the problems of corrosion inhibitor environmental protection, poor stability and adaptability, etc., achieve excellent slow-release effect, prevent oxidation, and reduce environmental pollution

Active Publication Date: 2011-08-31
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

[0005] In order to overcome the problems of poor environmental protection, stability and adaptability of corrosion inhibitors in the prior art, the present inven

Method used

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  • Corrosion inhibitor for sour oil and gas fields
  • Corrosion inhibitor for sour oil and gas fields

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] For pipeline natural gas total pressure P=12MPa, P H2S =0.72MPa, P CO2 =0.93MPa, gas transmission capacity=300,000 cubic meters / day, condensate oil production=5.3t / day, water production=1.0t / day sour oil and gas field pipeline

[0040] Corrosion inhibitor formula:

[0041] Cyclohexamide Salicylate 20%

[0042] Pyridinium quaternary ammonium salt 10%

[0043] Sodium dodecylbenzenesulfonate 0.2%

[0044] Antioxidant BHT 0.2%

[0045] Descaler PAC 0.1%

[0046] Silicone oil defoamer 0.5%

[0047] Naphthenate 0.4%

[0048] Composite solvent 68.6%

[0049] Wherein the composite solvent is composed of the following components in mass percentage:

[0050] Ethanol 30%

[0051] Ethylene glycol 20%

[0052] water 50%

[0053] In accordance with the provisions of ASTM G170-06 "Standard Guide for Laboratory Evaluation and Verification of Corrosion Inhibitors in Oilfields and Refineries", the dynamic weight loss coupon test was carried out under simulated working conditi...

Embodiment 2

[0057] For pipeline natural gas total pressure P=14.5MPa, P H2S =0.55MPa, P CO2 =0.64MPa, gas transmission capacity=280,000 cubic meters / day, condensate oil production=0.3t / day, water production=2.1t / day sour oil and gas field pipeline

[0058] Corrosion inhibitor formula:

[0059] Cyclohexamide Salicylate 10%

[0060] Pyridinium quaternary ammonium salt 5%

[0061] Sodium dodecylbenzenesulfonate 0.1%

[0062] Antioxidant BHT 0.1%

[0063] Descaler PAC 0.2%

[0064] Silicone oil defoamer 0.3%

[0065] Naphthenate 0.3%

[0066] Composite solvent 84%

[0067] Wherein the composite solvent is composed of the following components in mass percentage:

[0068] Ethanol 50%

[0069] Ethylene glycol 30%

[0070] water 20%

[0071] In accordance with the provisions of ASTM G170-06 "Standard Guide for Laboratory Evaluation and Verification of Corrosion Inhibitors in Oilfields and Refineries", the dynamic weight loss coupon test was carried out under simulated working conditio...

Embodiment 3

[0075] It is used in sour oil and gas fields where the total pressure of pipeline natural gas is P=14.5MPa, PH2S=0.55MPa, PCO2=0.64MPa, gas transmission volume is 280,000 standard cubic meters per day, condensate oil production is 0.3t / day, and water production is 2.1t / day in the pipeline,

[0076] Corrosion inhibitor formula:

[0077] Cyclohexamide Salicylate 15%

[0078] Pyridinium quaternary ammonium salt 9%

[0079] Sodium dodecylbenzenesulfonate 0.1%

[0080] Antioxidant BHT 0.1%

[0081] Descaler PAC 0.1%

[0082] Silicone oil defoamer 0.3%

[0083] Naphthenate 0.4%

[0084] Composite solvent 75%

[0085] Wherein the composite solvent is composed of the following components in mass percentage:

[0086] Ethanol 40%

[0087] Ethylene glycol 20%

[0088] water 40%

[0089] In accordance with the provisions of ASTM G170-06 "Standard Guide for Laboratory Evaluation and Verification of Corrosion Inhibitors in Oilfields and Refineries", the dynamic weight loss coupon...

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Abstract

The invention belongs to the field of metal corrosion prevention, and discloses a corrosion inhibitor for sour oil and gas fields, directing at the problems of poor environmental protection, stability and adaptability in traditional corrosion inhibitors. The corrosion inhibitor comprises salicylic acid cyclohexidine actidione, pyridine quaternary ammonium salt, sodium dodecyl benzene sulfonate, an antioxidant BHT, a silicon defoamer, naphthenate, a disincrustant PAC and a composite solvent. The corrosion inhibitor prepared by the invention has excellent water-soluble and oil-soluble dispersity, a simple production process, safety, environmental protection property and an excellent slow release effect, can be used for ground gathering, storage and transportation systems of sour or high sour oil and gas fields to prevent damages of corrosive gases to metal materials such as iron and steel and reduce the corrosion losses.

Description

technical field [0001] The invention relates to the field of metal anticorrosion, in particular to a corrosion inhibitor used in acid oil and gas fields. Background technique [0002] In recent years, with the continuous development of the global economy and the rising demand for energy, humans have increased the exploitation of sour oil and gas fields high in hydrogen sulfide and carbon dioxide. Hydrogen sulfide and carbon dioxide are two of the most common and harmful corrosive media, which cause "sour corrosion" and "sweet corrosion" respectively. In addition, the produced oil and gas often contain a large amount of condensate oil and gas field water, and some oil and gas field stratum produced water also contains a high content of chloride ions, which are highly corrosive to pipelines and can easily lead to dangerous accidents such as perforation and explosion . The corrosion of oil and natural gas gathering and transportation pipelines seriously restricts the developm...

Claims

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Application Information

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IPC IPC(8): C23F11/04
Inventor 杜磊张金钟施岱艳张乐长曹晓燕
Owner BC P INC CHINA NAT PETROLEUM CORP
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