Patent ID: 8807222
Filing Date: 2014-08-19
Classification: E21B

Abstract:
1. A process for reducing pressure for injecting a solution of water-soluble polymer from a single injection pump into various oil wells in a given field as a function of fracturing pressure for each well, comprising: employing the single injection pump to provide the same solution of water-soluble polymer with a first well injection pressure concurrently to the various oil wells, placing a respective main volumetric pump between the single injection pump and each respective well, detecting fracturing pressure of each respective well with a pressure measuring instrument, and controlling flow rate of the respective main volumetric pump, using a brake, to reduce the first well injection pressure of the solution from the single injection pump to a second well injection pressure below the detected fracturing pressure of the respective well, wherein the second well injection pressure is equal to or lower than the first well injection pressure.