Patents by Inventor Elvira H. Mulder

Elvira H. Mulder 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 for drilling a borehole from one cased borehole to another cased borehole
    Patent number: 5541517
    Abstract: In a method for drilling adjacent to a cased known first borehole a second borehole in a predetermined direction the following steps are carried out for a number of along hole depths d.sub.i :measuring components of gravity acceleration and magnetic field (earth & casing);determining direction parameters .alpha..sub.i ;deriving magnetic polestrength components, B.sub.p1,i and B.sub.p2,i ;applying B.sub.p1,i /B.sub.p2,i =s.sub.1,i /s.sub.2,i and determining deviations of the predetermined direction; andcontrolling drilling direction of the second borehole.
    Type: Grant
    Filed: January 5, 1995
    Date of Patent: July 30, 1996
    Assignee: Shell Oil Company
    Inventors: Robin A. Hartmann, Elvira H. Mulder