Continuous flow drilling systems and methods

摘要

CONTINUOUS FLOW DRILLING SYSTEMS AND METHODS A method for drilling a wellbore (800), comprising: drilling the wellbore (800) by injecting drilling fluid (804f) into the wellbore (800) having a first tubular string (8011) disposed therein and rotating a drill bit (803) connected to a bottom of the first tubular string (8011); and while adding a tubularjoint or stand of joints to the first tubular string (8011), injecting drilling fluid (804f) into a first annulus formed between the first tubular string (8011) and a second tubular string (8011); diverting the drilling fluid (804f) into a longitudinal bore of the first tubular string (8011) through a port(337) formed through a wall of the first tubular string (8011) by a seal disposed in the first annulus; and diverting returned drilling fluid (804r) into a second annulus or third tubular string (8011) by the seal.