Sulfonated Olefin Corrosion Inhibitors for High-Temperature Oilfield Metal Protection
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Solution Overview
Problem
Existing corrosion inhibitors in the oil and gas industry are not effective at high temperatures above 250° F (121° C), leading to metal surface deterioration in corrosive environments common in oilfield operations.
Innovation Solution
The use of sulfonated organic compounds, specifically internal olefin sulfonates, alpha olefin sulfonates, alpha-sulfonated fatty acid esters, and sulfonated fatty acid salts with carbon chain lengths of 15 to 26 atoms, as corrosion inhibitor actives to mitigate metal corrosion in high-temperature environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional corrosion inhibitors (phosphate esters, dimer/trimer fatty acids, mercaptans, amines) are used, then corrosion protection is achieved under normal conditions, but they become ineffective at high temperatures greater than 250° F. (121° C.)
Solution Approach 1:
The patent applies parameter changes by modifying the chemical structure of corrosion inhibitor actives from conventional types to sulfonate esters with specific carbon chain lengths (15-26 carbons). This structural parameter change enables the inhibitors to maintain effectiveness at high temperatures (250° F. or 121° C. and above) where conventional inhibitors fail, directly resolving the contradiction between corrosion protection reliability and temperature stability.
2Productivity
If metal equipment is used in corrosive environments, then production operations can be conducted, but metal surfaces suffer oxidation, deterioration, and loss of metal
Solution Approach 1:
The patent employs sulfonate ester corrosion inhibitors as intermediary substances that form protective films on metal surfaces. These intermediaries mediate between the corrosive environment (carbon dioxide, hydrogen sulfide, brines, acids) and the metal equipment, preventing direct harmful interactions while allowing production operations to continue normally.
3Productivity
If offshore or deep-sea operations are conducted, then resource extraction is enabled, but replacement of corroded metal equipment becomes extremely difficult
Solution Approach 1:
The patent applies preliminary action by implementing corrosion inhibition measures before significant corrosion damage occurs. By using sulfonate ester inhibitors that remain effective at high temperatures and in harsh offshore environments, the system prevents corrosion proactively, avoiding the need for difficult equipment replacement operations in offshore or deep-sea locations.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
These sulfonated compounds provide effective corrosion inhibition, forming a protective film on metal surfaces, reducing corrosion rates and maintaining asset integrity in high-temperature corrosive environments, outperforming conventional inhibitors.
Implementation Method 1
introducing a sulfonate corrosion inhibitor active into a corrosive environment in contact with the metal surface, in an amount effective to decrease corrosion of the metal surface
Data Source
AI summary
A corrosion inhibitor active and method for reducing corrosion of a metal surface in contact with a corrosive environment is disclosed. The corrosion inhibitor active is an organic sulfonated compound that is derived from the sulfonation of one or more carboxylic acids, internal olefins, or alpha-olefins having a carbon chain length of 15 to 26 carbon atoms. The method of reducing corrosion includes contacting the metal surface with an effective amount of the corrosion inhibitor active. The corrosion inhibitor active is useful in high temperature corrosive environments, such as those found in oil and gas operations.