摘要:
A process for the emulsion polymerization in the presence of a stable free radical of at least one monomer which can be polymerized by the radical route, which emulsion comprises a liquid aqueous phase and a liquid organic phase, the aqueous phase comprising at least 50% by weight of water and the liquid organic phase comprising more than 50% by weight of monomer(s) to be polymerized. The invention results, by a rapid controlled polymerization process, in a latex of polymer particles, it being possible for the polymer to comprise acrylate and/or methacrylate blocks.
摘要:
The permeability of a subterranean reservoir can be more easily controlled by first injecting a crosslinking agent solution and then subsequently injecting a scleroglucan solution to thereby form, in situ, crosslinked scleroglucan gel. This reverse order of injection allows for a more homogeneous gel propagation without substantial risk of plugging.
摘要:
The invention has as its object the use of new composition of gels that can be used for the reduction of the production of water in oil- or gas-producing wells.The compositions of gels comprise a solution of at least one water-soluble complex of a polyvalent metallic cation such as zirconium lactate able to cross link a nonionic polysaccharide such as scleroglucan, at a concentration of 2 to 10,000 parts per million of parts, expressed by weight of metal dioxide. With a preferred concentration of 2 to 100 ppm, the oil permeability is not appreciably affected.The compositions make possible the formation of aqueous gels of scleroglucan that can be used for the prevention of inflows of water into the hydrocarbon-producing wells.