Abstract: A flow rate control valve and a method for injecting a fluid into an underground formation are provided. In accordance with the method, the fluid is transported in at least one injection pipe. The injection pipe has a main portion including a single tube. The flow rate control valve has at least ten fluid transport tubes that are arranged in parallel. A ratio of the cross-section of the main portion over the sum of the cross-sections of the fluid transport tubes is less than or equal to 5. A flow rate of the fluid circulating in the injection pipe is adjusted by distributing the fluid through all or only some of the fluid transport tubes. The fluid from the injection pipe is then injected into the underground formation.

Abstract: The disclosure relates to a method for injecting a fluid into an underground formation, wherein: a fluid is transported in at least one injection pipe; the injection pipe includes a main portion further including a single tube, and a flow rate control valve including at least ten fluid transport tubes arranged in parallel; where the ratio of the section of the single tube of the main portion over the sum of the section of the fluid transport tubes of the flow rate control valve is less than or equal to 5; the flow rate of the fluid circulating in the injection pipe is adjusted by distributing the fluid in all or part of the fluid transport tubes of the flow rate control valve; and the fluid from the injection pipe is injected into the underground formation. The disclosure also relates to a flow rate control valve comprising an installation for injecting a fluid.

Abstract: The present invention relates to a method of treating porous and permeable underground formations or cavities of reservoir rock or sand foundation type. The method consists in injecting a liquid composition comprising microgels into the formations in order to reduce the production of water, gas or sands, and/or for zone abandonment.

Abstract: The present invention relates to a method of treating porous and permeable underground formations or cavities of reservoir rock or sand foundation type. The method consists in injecting a liquid composition comprising microgels into the formations in order to reduce the production of water, gas or sands, and/or for zone abandonment.

Abstract: The present invention relates to a method for preparing microgels of controlled size. According to the method, a gelling composition comprising a polymer and a crosslinking additive intended for the polymer is injected into a porous and permeable medium, and a monodisperse solution of microgels of substantially constant size is recovered at the outlet. The invention also relates to an application of the method for reducing the permeability of porous and permeable formations of reservoir rock type.

Abstract: A method for reducing retention of a polymer based displacement agent injected into a hydrocarbon containing rock matrix involves treating the matrix with an adsorbent solution containing alkali metal phosphates after the rock matrix comprising clays has been stabilized by injection of a solution containing cations obtained from KCl or NaCL salts. The presence of the cations increases the effect of the adsorbent solution.

Abstract: An aqueous composition is provided, suitable for direct use in waterflood oil recovery processes, which comprises the clarified fermentation fluid obtained by(a) culturing a polysaccharide-producing microorganism in an aqueous culture medium to produce an aqueous culture containing dissolved polysaccharide therein; and(b) clarifying the resultant aqueous culture from (a) by at least one of centrifugation and filtration, introducing therein at least one bactericidal agent, and recovering the resultant clarified fermentation fluid;said aqueous composition being obtained without precipitation and recovery of a solid polysaccharide and dissolution thereof in an aqueous medium.The above composition can be pumped into oil formations without substantial clogging thereof.

Abstract: Process for reducing or suppressing water penetration into oil or gas producing wells which comprises injecting an aqueous polymer solution of controlled viscosity into an underground formation and then placing the well on production. The polymer is, for example, hydrolyzed polyacrylamide and the solution is preferably a salt solution.