Patents Assigned to FRONTIER OIL TOOLS
  • Patent number: 11035200
    Abstract: In a first aspect, a bidirectional formation protection valve includes: a tubular body having an inner diameter defining a fluid flow path therethrough and being adapted to be sealably disposed within a wellbore; an uphole valve disposed within the inner diameter of the tubular body to control fluid flow therethrough, the uphole valve being biased to close the fluid flow path against a first pressure and adapted to be opened upon receiving a stinger in the inner diameter, and a downhole valve disposed within the inner diameter of the tubular body to control fluid flow therethrough, the downhole valve being biased to close the fluid flow path against a second pressure and adapted to be opened upon receiving a stinger in the inner diameter. The first and second pressures are an uphole pressure from kill fluids and a downhole pressure from formation fluids.
    Type: Grant
    Filed: March 19, 2018
    Date of Patent: June 15, 2021
    Assignee: FRONTIER OIL TOOLS
    Inventor: George James Melenyzer