Methods of Inhibiting and/or Preventing Corrosion in Oilfield Treatment Applications

A method of inhibiting corrosion by acid in a conduit having a metallic surface exposed to produced subterranean formation fluids wherein the acid is created from hydrogen sulfide and carbon dioxide, the method comprising introducing into the conduit at least one compound of the formula:

• wherein:
• R1 is independently H, —[—CnH2nO—]a—H, or an alkyl group having from 1 to about 24 carbon atoms;
• R2 is independently H or —[—CnH2nO—]b—H, or an alkyl group having from 1 to about 24 carbon atoms;
• R3 is —CdH2d—[—OCnH2n—]e—,
• R4 is independently H or —[—CnH2nO—]f—H,
• R5 is independently H or —[—CnH2nO—]g—H,
• a is from about 1 to about 8;
• b+f+g is between 0 to about 30;
• d is from about 1 to 6;
• e is from about 1 to about 8;
• and
• n is 2 or 3
• and thereby inhibiting corrosion of the metallic surface of the conduit by the acid created from hydrogen sulfide and carbon dioxide.

In a method of treating a metallic surface of a conduit exposed to produced subterranean formation fluids wherein a corrosion inhibitor is introduced into the conduit to inhibit corrosion of the metallic surface of the conduit, the improvement being introducing into the conduit a corrosion inhibitor selected from the group consisting of:

• (a)
• wherein the average value of h is between from about 2.6 to about 5.6;
• and
• (b) H2N—(CH2)2—(—OCH2CH2—)2—NH2.