2results about How to "Long gelling time" patented technology

This invention relates to a metal ion crosslinking stabilizer. It primarily addresses the problems of existing gel profile control agents, such as short gelation time, easy damage to medium and low permeability layers during injection, and inability to achieve deep reservoir sealing. Its components and proportions by mass percentage are as follows: 1%-2% retarder, 3%-5% reinforcing agent, 1%-3% regulator, 4%-5% ion stabilizer, 1%-2% water purifier, and the balance being water. Preparation method: 1) Add the ion stabilizer and reinforcing agent to water according to the proportions and mix evenly in a 45°C water bath; 2) Add the regulator to the mixture and mix evenly; 3) Add the retarder and maintain the water bath for 2-3 hours; 4) Add the water purifier to obtain the target product. This metal ion crosslinking stabilizer can be used as an auxiliary additive component in the formulation of polyacrylamide ion crosslinking profile control agent systems. It can prolong the gelation time of the profile control agent, ensure the gel viscosity of the profile control agent, improve the stability of the profile control agent, and achieve effective sealing of the system.

The application discloses a polymer gel deep profile control agent and a preparation method and application thereof. The polymer gel deep profile control agent comprises a gel-forming polymer, a crosslinking agent and water, wherein the gel-forming polymer contains a ketone carbonyl structural unit, and the crosslinking agent contains at least two active hydrogens; the gel-forming polymer further contains an acrylamide structural unit, an optional anion structural unit and an optional cation structural unit. The polymer gel deep profile control agent is simple to prepare, stable in performance, convenient to construct, long in gel-forming time, high in gel strength after gel-forming, can make the polymer gel enter a deep part of an oil reservoir, block a high-permeability layer and improve water injection development effect. In addition, the gel system does not contain heavy metal ions and is an environment-friendly water plugging and profile control agent.