Patents by Inventor Marco A. N. Herdeiro

Marco A. N. Herdeiro 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).

  • Process for running scrapers, particularly for subsea petroleum well lines
    Patent number: 5267616
    Abstract: A process for running scrapers for subsea petroleum well lines has, according to a first embodiment, launching of a scraper through the line to be disobstructed, towards the wellhead on a step-by-step basis. The operation proceeds by sending the scraper along successively larger sections via reversing flow through the obstructed line to limit passage of the scraper to that obstructed line, until the whole line is swept. Furthermore, according to a second embodiment, the process consists of the launching of one or more scrapers from a chamber installed in the subsea production system, towards the platform, sweeping only the whole obstructed line, all at once. Preferably one or more scrapers are launched from a chamber installed in the subsea equipment towards the surface platform and sweeping the entirety of a first obstructed line.
    Type: Grant
    Filed: October 15, 1991
    Date of Patent: December 7, 1993
    Inventors: Jose E. M. D. Silva, Marco A. N. Herdeiro, Ricardo W. Capplonch, Luiz V. A. P. Miranda