Patents Assigned to Jack A. Crain
  • Patent number: 6142234
    Abstract: Apparatus and method are provided for applying a force to a movable subsea member to move it into a preferred location for joining to a fixed member while the location of the movable member is monitored. Nozzles in the device are placed in the direction such that fluid exiting the nozzles creates a force so as to move the movable member into the preferred location. Fluid is pumped through the device and out through one or more nozzles. An environmental conductor may be tied back from a subsea wellhead using the apparatus and method by observing the location of the conductor over the subsea wellhead using a remotely operated vehicle (ROV) while fluid is pumped at the pressure and rate so as to move the conductor into position over the wellhead and lowering the conductor into the wellhead.
    Type: Grant
    Filed: March 16, 1998
    Date of Patent: November 7, 2000
    Assignee: Jack Crain
    Inventor: Jack Crain
  • Patent number: 6053255
    Abstract: Apparatus and method for lifting blowout preventers beneath the floor of a drilling rig are provided. More than one cable is used on the drums of winches, allowing the winches to be compact enough for use on a drilling rig floor while avoiding the requirement for larger cable that would be required to achieve the high safety factors needed. The cables or wire ropes on the winches are attached to a member from which a larger diameter, higher strength intermediate cable is also attached. The intermediate cable is then attached to known apparatus such as a cradle for lifting a blowout preventer stack.
    Type: Grant
    Filed: June 23, 1998
    Date of Patent: April 25, 2000
    Assignee: Jack A. Crain
    Inventor: Jack A. Crain