Method for the drilling of oil wells

Abstract

Method for the drilling of oil wells and for the positioning of the appropriate casings, consisting in drilling the well section of interest and, during the drilling, in maintaining a high degree of hole regularity by the use of automatic verticality and/or curvature control equipment. This method allows the positioning of casings with an almost constant clearance with values of +/−1.5 inches for the whole well depth (lean profile).

1 . A method for the drilling of oil wells and positioning of the appropriate casings, consisting in drilling the well section of interest and, during the drilling, in maintaining a high degree of hole regularity by the use of automatic verticality and/or curvature control equipment.  
     
     
         2 . The method for the drilling of oil wells and positioning of the appropriate casings according to the previous claim, characterized in that the drilling phase is carried out observing the following precautions: 
 automatic control of the verticality and/or curvature of the well using the device called “Straight Hole Drilling Device” (SDD);    use of bits equipped with adequate distributors and roller reamers    use of drilling mud with chemical and rheological characteristics which are such as to minimize any possible well instability problems    constant control of all the drilling parameters in order to maintain a curvature (BUR/DO) of 0.7 degrees of every 30 m, with a maximum slope of 1.5 degrees in the vertical sections.