Patent ID: 7163059
Filing Date: 2007-01-16
Classification: E21B

Abstract:
1. A method for releasing a drill string stuck against a wall of a well bore due to pressure differential between a hydrostatic pressure of a fluid in the well bore and a pressure of a formation at the point where the drill string is stuck, the drill string and the well bore forming an annulus, the method comprising: injecting a first fluid into the annulus via the drill string; and simultaneously injecting a second fluid into the annulus at an upper end of the annulus, wherein the first fluid and the second fluid are injected into the annulus at a volume and rate sufficient to cause at least a portion of one of the first fluid and the second fluid to penetrate the formation and thereby increase the pressure of the formation adjacent the well bore so that the pressure of the formation adjacent the well bore is substantially equalized with the pressure of the well bore.