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US 12,516,235 B2Granted
Cementitious composition comprising a polymeric micro-gel as an anti-gas migration agent
AssigneeSnf Group
InventorsOlivier Braun, Bruno Giovannetti
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Abstract
The present invention concerns the technical field of cementing, in particular in the construction of oil and/or gas wells or geothermal energy. More specifically, the subject of the present invention is a cementitious composition and an improved method of cementing by means of the introduction into the cement of a polymeric micro-gel as an anti-gas migration agent.
Claims17
A cementitious composition which contains:
- a polymeric micro-gel;
- a cement;
- and
- water;
- wherein the polymeric micro-gel contains at least a polymer structured by at least one crosslinking agent,
- wherein the structured polymer is obtained by polymerization in an inverse microemulsion of:
- at least one anionic monomer;
- or at least one anionic monomer and at least one nonionic monomer,
- wherein the at least one anionic monomer has a functional group chosen from acrylic, maleic, fumaric, malonic, itaconic and allylic functional groups,
- wherein, when present, the at least one non-ionic monomer is chosen from the group consisting of acrylamide, methacrylamide, N-isopropylacrylamide, N,N-dimethylacrylamide, N,N-diethylacrylamide, N-methylolacrylamide, N-vinylformamide (NVF), N-vinyl acetamide, N-vinylpyridine and N-vinylpyrrolidone (NVP), N-vinyl imidazole, N-vinyl caprolactame, N-vinyl succinimide, acryloyl morpholine (ACMO), acryloyl chloride, glycidyl methacrylate, glyceryl methacrylate, diacetone acrylamide, hydroxyalkyl (meth)acrylates with an alkyl in C1-C3, aminoalkyl (meth)acrylates with an alkyl in C1-C3, thioalkyl (meth)acrylates with an alkyl in C1-C3 and mixtures thereof, and
- wherein the microemulsion comprises droplets of a hydrophilic phase with a size of between 20 and 500 nm.
8 more elements
A cementitious composition which contains:
- a polymeric micro-gel;
- a cement;
- and
- water;
- wherein the polymeric micro-gel contains at least a polymer structured by at least one crosslinking agent,
- wherein the structured polymer is obtained by polymerization in an inverse microemulsion of:
- at least one anionic monomer;
- or at least one anionic monomer and at least one nonionic monomer,
- wherein, apart from the at least one crosslinking agent, monomers polymerized to form the structured polymer are selected from the group consisting of:
- one or more one anionic monomer having a functional group chosen from acrylic, maleic, fumaric, malonic, itaconic and allylic functional groups;
- and
- optionally, one or more non-ionic monomer chosen from the group consisting of acrylamide, methacrylamide, N-isopropylacrylamide, N,N-dimethylacrylamide, N,N-diethylacrylamide, N-methylolacrylamide, N-vinylformamide (NVF), N-vinyl acetamide, N-vinylpyridine and N-vinylpyrrolidone (NVP), N-vinyl imidazole, N-vinyl caprolactame, N-vinyl succinimide, acryloyl morpholine (ACMO), acryloyl chloride, glycidyl methacrylate, glyceryl methacrylate, diacetone acrylamide, hydroxyalkyl (meth)acrylates with an alkyl in C1-C3, aminoalkyl (meth)acrylates with an alkyl in C1-C3, thioalkyl (meth)acrylates with an alkyl in C1-C3 and mixtures thereof,
- wherein the microemulsion comprises droplets of a hydrophilic phase with a size of between 20 and 500 nm.
10 more elements
Dependencies are inferred from the claim text.