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.
Claims20
A cementitious composition which contains:
- a polymeric micro-gel;
- a cement;
- water;
- optionally at least one cementing additive;
- 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 monomer,
- wherein the microemulsion comprises droplets of a hydrophilic phase with a size of between and 500 nm.
The use, for forming a cementitious composition, of a polymeric micro-gel comprising at least one polymer structured by at least one crosslinking agent,
- the structured polymer being obtained by polymerization in an inverse microemulsion of at least one monomer,
- wherein the microemulsion comprises droplets of a hydrophilic phase with a size of between and 500 nm.
A preparation method for a cementitious composition, which contains the mixture of the following compounds:
- a polymeric micro-gel;
- a cement;
- water;
- optionally at least one cementing additive;
- wherein the polymeric micro-gel contains at least one polymer structured by at least one crosslinking agent,
- wherein the structured polymer is obtained by polymerization in an inverse microemulsion of at least one monomer,
- wherein the microemulsion comprises droplets of a hydrophilic phase with a size of between and 500 nm.
Dependencies are inferred from the claim text.