Patents by Inventor Lee L. Shafer

Lee L. Shafer 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).

  • Patent number: 6520255
    Abstract: The invention discloses methods of, as well as apparatus and systems for, perforating and treating multiple intervals of one or more subterranean formations intersected by a wellbore by deploying a bottom-hole assembly (“BHA”) having a perforating device and a sealing mechanism within said wellbore. In one embodiment, the perforating device has no washing fluid flow passage provided therethrough. In another embodiment, an erosive jet device is used to perforate at least one interval of said one or more subterranean formations. In yet another embodiment, the BHA has at least one pressure equalization means that establishes pressure communication between the portions of the wellbore above and below the sealing mechanism. In another embodiment, the BHA comprises a perforating device and a sealing mechanism, wherein the perforating device is positioned below the sealing mechanism.
    Type: Grant
    Filed: February 28, 2002
    Date of Patent: February 18, 2003
    Assignee: ExxonMobil Upstream Research Company
    Inventors: Randy C. Tolman, Lawrence O. Carlson, David A. Kinison, Kris J. Nygaard, Glenn S. Goss, William A. Sorem, Lee L. Shafer
  • Publication number: 20020092650
    Abstract: The invention discloses methods of, as well as apparatus and systems for, perforating and treating multiple intervals of one or more subterranean formations intersected by a wellbore by deploying a bottom-hole assembly (“BHA”) having a perforating device and a sealing mechanism within said wellbore. In one embodiment, the perforating device has no washing fluid flow passage provided therethrough. In another embodiment, an erosive jet device is used to perforate at least one interval of said one or more subterranean formations. In yet another embodiment, the BHA has at least one pressure equalization means that establishes pressure communication between the portions of the wellbore above and below the sealing mechanism. In another embodiment, the BHA comprises a perforating device and a sealing mechanism, wherein the perforating device is positioned below the sealing mechanism.
    Type: Application
    Filed: February 28, 2002
    Publication date: July 18, 2002
    Inventors: Randy C. Tolman, Lawrence O. Carlson, David A. Kinison, Kris J. Nygaard, Glenn S. Goss, William A. Sorem, Lee L. Shafer
  • Patent number: 6394184
    Abstract: The invention provides an apparatus and method for perforating and treating multiple intervals of one or more subterranean formations intersected by a wellbore by deploying a bottom-hole assembly (“BHA”) having a perforating device and at least one sealing mechanism within said wellbore. The BHA may be deployed in the wellbore using a tubing string or cable; or alternatively, the BHA may be deployed using a tractor system attached directly to the BHA. The perforating device is used to perforate the first interval to be treated. Then the BHA is positioned within the wellbore such that the sealing mechanism, when actuated, establishes a hydraulic seal in the wellbore to positively force fluid to enter the perforations corresponding to the first interval to be treated. A treating fluid is then pumped down the wellbore and into the perforations created in the perforated interval.
    Type: Grant
    Filed: February 12, 2001
    Date of Patent: May 28, 2002
    Assignee: ExxonMobil Upstream Research Company
    Inventors: Randy C. Tolman, Lawrence O. Carlson, David A. Kinison, Kris J. Nygaard, Glenn S. Goss, William A. Sorem, Lee L. Shafer
  • Publication number: 20010050172
    Abstract: The invention provides an apparatus and method for perforating and treating multiple intervals of one or more subterranean formations intersected by a wellbore by deploying a bottom-hole assembly (“BHA”) having a perforating device and at least one sealing mechanism within said wellbore. The BHA may be deployed in the wellbore using a tubing string or cable; or alternatively, the BHA may be deployed using a tractor system attached directly to the BHA. The perforating device is used to perforate the first interval to be treated. Then the BHA is positioned within the wellbore such that the sealing mechanism, when actuated, establishes a hydraulic seal in the wellbore to positively force fluid to enter the perforations corresponding to the first interval to be treated. A treating fluid is then pumped down the wellbore and into the perforations created in the perforated interval.
    Type: Application
    Filed: February 12, 2001
    Publication date: December 13, 2001
    Inventors: Randy C. Tolman, Lawrence O. Carlson, David A. Kinison, Kris J. Nygaard, Glenn S. Goss, William A. Sorem, Lee L. Shafer