Compositions, systems, and methods for removing iron sulfide scale from oilfield components
The present disclosure relates to compositions, systems and methods for removing iron sulfide scale from a solid object, such as an oilfield component. The compositions include a carbon-carbon (C—C) double bond with an electron withdrawing group bonded to at least one of the double-bonded carbons.
1. A method of removing iron sulfide scale from an oilfield component with iron sulfide scale, the method comprising applying to the oilfield component in an amount and for a time sufficient to remove iron sulfide scale from the oilfield component a removal material comprising a composition with the general structural formula:
wherein R 1 comprises a nitrile group and R 2 is R 1 , hydrogen (H), or a moiety comprising an electron withdrawing group, and
wherein at least 80% of the iron sulfide scale on the oilfield component is broken into component ions by the composition with general structural formula (I).
2. The method of claim 1 , wherein the removal material comprises at least two distinct compositions with the general structural formula (I).
3. The method of claim 1 , wherein the removal material further comprises a polar solvent.
4. The method of claim 1 , wherein at least 85% of the iron sulfide scale on the oilfield component is broken into component ions by the composition with general structural formula (I).
5. The method of claim 1 , wherein applying occurs in a sealed container.
6. The method of claim 1 , further comprising recovering the removal material.
7. The method of claim 1 , wherein the oilfield component comprises a perforation, a casing, a production tubular, a valve, a pump, or downhole completion equipment with iron sulfide scale.
8. The method of claim 1 , wherein at least 90% of the iron sulfide scale on the oilfield component is broken into component ions by the composition with general structural formula (I).
9. The method of claim 1 , wherein at least 95% of the iron sulfide scale on the oilfield component is broken into component ions by the composition with general structural formula (I).
10. The method of claim 1 , wherein substantially all of the iron sulfide scale on the oilfield component is broken into component ions by the composition with general structural formula (I).