Patents Assigned to Welldata (Subsurface Surveillance Systems) Limited
  • Downhole detection
    Patent number: 11920466
    Abstract: There is disclosed an apparatus (115) for detecting and/or measuring a downhole feature (195), such as a fluid/fluid interface, in a well (105). The apparatus (115) comprises a first fluid and/or liquid permeable tube (120). The first tube (120) is porous or (micro)perforated. The apparatus (115) comprises a second fluid and/or liquid impermeable tube (130). The first and second tubes (110, 130) are hollow, and therefore, provide first and second waveguides, respectively.
    Type: Grant
    Filed: February 7, 2019
    Date of Patent: March 5, 2024
    Assignee: Welldata (Subsurface Surveillance Systems) Limited
    Inventor: Sydney Joseph Littleford