Patents by Inventor Marco Rasi

Marco Rasi 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 to combine statistical and engineering techniques for stuck pipe data analysis
    Patent number: 5508915
    Abstract: The current invention is a method for modeling the probability of a drill string becoming stuck within a given time frame and a method for applying the model to a well being drilled to reduce the probability of sticking. The model is constructed by performing canonical discriminant analysis on engineering parameters derived from observations taken in historical wells and creating a canonical space with the resulting canonical functions. Posterior probabilities of sticking are then calculated from the historical observations and mapped into the canonical space. To apply the model to a particular well being drilled, the values of the previously derived engineering parameters are calculated from observations in the well being drilled, multiplied by their corresponding canonical coefficients, and summed to obtain a canonical point representation for drilling in that well. This canonical point representation is then mapped into the canonical space to obtain the probability of sticking.
    Type: Grant
    Filed: June 20, 1995
    Date of Patent: April 16, 1996
    Assignee: Exxon Production Research Company
    Inventors: Yuh-Hwang Tsao, William E. Kline, Michele M. Thomas, Eugene A. Sikirica, Albert T. Wang, Marco Rasi
  • Method of controlling cuttings accumulation in high-angle wells
    Patent number: 5327984
    Abstract: A method is provided, based on assigned drilling variables, for predicting the area of open region above a bed of cuttings resulting from drilling a high-angle well. The area of the bit used in drilling is compared with the area of the open region and drill pipe to determine a Hole-Cleaning Ratio. Occurrences of sticking of drill pipe or other drilling problems in prior-drilled wells are correlated with Hole Cleaning Ratio in those wells to determine a relationship for predicting risk of drilling problems in wells of interest. Risk factors so determined are used to modify conditions or equipment during drilling or to plan future wells.
    Type: Grant
    Filed: March 17, 1993
    Date of Patent: July 12, 1994
    Assignee: Exxon Production Research Company
    Inventors: Marco Rasi, Eugene A. Sikirica
  • Method for reducing occurrences of stuck drill pipe
    Patent number: 5316091
    Abstract: A method for determining a parameter by combination of engineering models and statistical analysis of drilling data in a data base to determine the frequency or probability of sticking of the drill string during drilling of wells at hole-angles from vertical to horizontal. The parameter can be used to decrease the probability of sticking of drill string during drilling a well and to minimize the cost of a well.
    Type: Grant
    Filed: March 17, 1993
    Date of Patent: May 31, 1994
    Assignee: Exxon Production Research Company
    Inventors: Marco Rasi, Mark W. Biegler, Eugene A. Sikirica