Patents by Inventor Christian BRATLI

Christian BRATLI has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method and system for managed pressure drilling
    Patent number: 10689928
    Abstract: A method for use with a managed pressure drilling (MPD) system, the system including a drill string having a drill bit, an annulus defined outside of the drill string, a mud pump for pumping mud down through the drill string and back up through the annulus, a control choke in an extraction path coupled to the annulus, a back pressure pump also coupled to the extraction path, and a programmable logic controller (PLC) for controlling the control choke, the method including: a) performing measurements to determine a dataset including, for each of a plurality of time steps k: a value of fluid flow rate through the drill bit qbit[k], a value of fluid flow rate through the control choke qc[k], a value of fluid flow rate from the back pressure pump qbpp[k] and a value of fluid pressure at the control choke pc[k]; b) executing an inversion algorithm on the PLC to obtain a value for the bulk modulus of a fluid within the annulus, the inversion algorithm taking the dataset as an input, wherein the inversion algorithm a
    Type: Grant
    Filed: June 2, 2017
    Date of Patent: June 23, 2020
    Assignee: EQUINOR ENERGY AS
    Inventors: Steinar Elgsæter, Christian Bratli
  • METHOD AND SYSTEM FOR MANAGED PRESSURE DRILLING
    Publication number: 20190301254
    Abstract: A method for use with a managed pressure drilling (MPD) system, the system including a drill string having a drill bit, an annulus defined outside of the drill string, a mud pump for pumping mud down through the drill string and back up through the annulus, a control choke in an extraction path coupled to the annulus, a back pressure pump also coupled to the extraction path, and a programmable logic controller (PLC) for controlling the control choke, the method including: a) performing measurements to determine a dataset including, for each of a plurality of time steps k: a value of fluid flow rate through the drill bit qbit[k], a value of fluid flow rate through the control choke qc[k], a value of fluid flow rate from the back pressure pump qbpp[k] and a value of fluid pressure at the control choke pc[k]; b) executing an inversion algorithm on the PLC to obtain a value for the bulk modulus of a fluid within the annulus, the inversion algorithm taking the dataset as an input, wherein the inversion algorithm a
    Type: Application
    Filed: June 2, 2017
    Publication date: October 3, 2019
    Applicant: EQUINOR ENERGY AS
    Inventors: Steinar ELGSÆTER, Christian BRATLI