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US 2016/0257873 A1Published application
Viscosifier agent for oilfield fluids in hard conditions
AssigneeRhodia Operations
InventorArnaud CADIX
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Abstract
The invention relates to aviscosifier useful for oilfield fluids, especially high TDS fluids and heavy brines, comprising: at least a zwitterionic polymer, prepared by inverse emulsion polymerization of: monomers A comprising a betaine group; nonionic monomers B monomers C including a metal ion crosslinkable group with a molar ratio of the monomers A to the monomers B between 4/96 and 40/60; and at least a metal ion compound leading to the crosslinking of the groups carried by monomers C.
Claims16
A viscosifier for oilfield fluids, comprising:
- at least one zwitterionic polymer, prepared by inverse emulsion polymerization of:
- monomers A, each comprising a betaine group;
- nonionic monomers B;
- and
- monomers C, each comprising a metal ion-crosslinkable group;
- with a molar ratio of the monomers A to the monomers B between 4/96 and 40/60;
- and
- at least one metal ion compound leading for crosslinking the metal ion-crosslinkable groups of monomers C,
5 more elements
A process for increasing the viscosity of an oilfield fluid, comprising adding to the fluid:
- at least one zwitterionic polymer, prepared by inverse emulsion polymerization of:
- monomers A, each comprising a betaine group;
- nonionic monomers B;
- and
- monomers C each comprising a metal ion crosslinkable group;
- with a molar ratio of the monomers A to the monomers B between 4/96 and 40/60, preferably 7/93 and 30/70, and
- at least one metal ion compound for crosslinking the metal ion-crosslinkable groups carried by of monomers C.
4 more elements
Dependencies are inferred from the claim text.