Controlling the stability of water in water emulsions

摘要

This invention relates to compositions and methods of treating a surface in contact with a wellbore and/or a subterranean formation penetrated by a well bore, comprising forming a treatment composition comprising a rheological polymer, a partitioning agent, and a liquid medium; and injecting the treatment fluid into the well bore, wherein the treatment composition forms a heterogeneous mixture comprising a dispersed rheological polymer-rich phase and a partitioning agent-rich phase, and wherein the stability of the heterogeneous mixture is controlled by introducing a stability control agent. This invention relates to compositions and methods for forming a water in water emulsion, comprising a rheological polymer, a partitioning agent, a liquid medium; and a stability control agent, wherein the emulsion is a heterogeneous mixture comprising a dispersed rheological polymer-rich phase and a partitioning agent-rich phase.

主权项

1. A method of treating a surface in contact with a wellbore and/or a subterranean formation penetrated by a well bore, comprising:
mixing a rheological polymer, a partitioning agent and a first aqueous medium to form a heterogeneous mixture comprising:
an aqueous partitioning agent-rich phase, wherein the partitioning agent-rich phase is continuous, andan aqueous rheological polymer-rich phase finely dispersed in the partitioning agent-rich phase; and, diluting the heterogeneous mixture with a second aqueous medium miscible with the first aqueous medium to mutually dissolve the polymer-rich phase and the partitioning-agent rich phase and form a well treatment fluid comprising a continuous mixed polymer-agent phase; and injecting the well treatment fluid into the well bore; wherein the stability of the heterogeneous mixture is controlled by introducing a stability control agent, wherein the partitioning agent is a polyoxyalkylene, and wherein the stability control agent is selected from the group consisting of polyvinyl pyrrolidone, vinyl pyrrolidone-vinyl acetate copolymers, hydroxyalkylated cellulose, carboxyalkylated cellulose, and non-ionic surfactants.