Activity enhanced scale dispersant for treating inorganic sulfide scales
View Patent ↗Processes and compositions to control inorganic sulfide scale formations in oilfield applications, including flow lines, wellbores, and subterranean formations. One example involves providing a treatment fluid comprising: a base fluid, a scale inhibitor, and a water clarifying agent; introducing the treatment fluid into a target region, wherein an inorganic cation and a sulfide anion are present in the target region; allowing the inorganic cation and the sulfide anion to form a sulfide precipitate; and using the treatment fluid to remove at least a portion of the sulfide precipitate from the target region.
1. A method comprising:
providing a treatment fluid comprising:
a base fluid,
a scale inhibitor, wherein the scale inhibitor comprises a phosphonate, and
a water clarifying agent, wherein the water clarifying agent comprises at least one compound selected from the group consisting of: a polyDADMAC, a DADMAC acrylamide copolymer, and any combination thereof;
introducing the treatment fluid into a target region, wherein an inorganic cation and a sulfide anion are present in the target region;
allowing the inorganic cation and the sulfide anion to form a sulfide precipitate; and
using the treatment fluid to remove at least a portion of the sulfide precipitate from the target region.
2. The method of claim 1 wherein the inorganic cation is a metal cation.
3. The method of claim 2 wherein the metal cation comprises at least one metal cation selected from the group consisting of: iron, zinc, lead, and any combination thereof.
4. The method of claim 1 wherein the target region is a portion of a wellbore.
5. The method of claim 4 wherein the treatment fluid is a consolidation fluid, a drilling fluid, a fracturing fluid, a completion fluid, a workover fluid, a packer fluid, a spacer fluid, or any combination thereof.
6. The method of claim 4 wherein the treatment fluid is introduced into the portion of the wellbore in a continuous injection.
7. The method of claim 4 wherein the treatment fluid is introduced into the portion of the wellbore using a pump.
8. A method comprising:
providing a treatment fluid comprising a base fluid, a scale inhibitor comprising a phosphonate, and a water clarifying agent comprising least one compound selected from the group consisting of: a polyDADMAC, a DADMAC acrylamide copolymer, and any combination thereof;
introducing the treatment fluid into a portion of a wellbore, wherein an inorganic cation and a sulfide anion are present in the wellbore;
allowing the inorganic cation and the sulfide anion to form a sulfide precipitate; and
using the treatment fluid to remove at least a portion of the sulfide precipitate from the wellbore.
9. The method of claim 8 wherein the inorganic cation is a metal cation.
10. The method of claim 9 wherein the metal cation comprises at least one metal cation selected from the group consisting of: iron, zinc, lead, and any combination thereof.
11. The method of claim 8 wherein the treatment fluid is a consolidation fluid, a drilling fluid, a fracturing fluid, a completion fluid, a workover fluid, a packer fluid, a spacer fluid, or any combination thereof.
12. The method of claim 8 wherein the treatment fluid is introduced into the portion of the wellbore in a continuous injection.
13. The method of claim 8 wherein the treatment fluid is introduced into the portion of the wellbore using a pump.
14. A composition comprising:
a base fluid;
a scale inhibitor, wherein the scale inhibitor comprises a phosphonate;
a water clarifying agent, wherein the water clarifying agent comprises at least one compound selected from the group consisting of: a polyDADMAC, a DADMAC acrylamide copolymer, and any combination thereof; and
a sulfide precipitate.
15. The composition of claim 14 wherein the sulfide precipitate comprises at least one compound selected from the group consisting of: iron sulfide, zinc sulfide, lead sulfide, and any combination thereof.