Patents by Inventor Spyros S. Nitis

Spyros S. Nitis 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 apparatus for drilling and re-entering multiple lateral branched in a well
    Patent number: 6012527
    Abstract: A method and apparatus for landing and orienting selected tools to selected depths within a well casing. The well casing is provided with a plurality of casing nipples located at selected depths with each of the landing and orienting joints defining a differing internal landing profile and having a mule shoe therein defining an upwardly facing point and an orientation slot and having helical guide ramp surfaces extending from the point to the orientation slot. A landing-orientation tool is adapted to be run into the casing and has an outer tubular body mandrel positioning a plurality of landing dogs for landing engagement with a matching landing profile of one of the casing nipples and positioning an orientation key for guided engagement with the helical guide ramp surfaces and for tool orienting engagement within the orientation slot.
    Type: Grant
    Filed: September 24, 1997
    Date of Patent: January 11, 2000
    Assignee: Schlumberger Technology Corporation
    Inventors: Spyros S. Nitis, Herve Ohmer, Mikhail V. Gotlib