Patent ID: 6942039
Filing Date: 2005-09-13
Classification: E21B

Abstract:
1. A method of retrieving multiple packer tool in a well in a single trip comprising: inserting a first packer tool to a predetermined location in a well; fixing said first packer tool at the predetermined location by expanding at least one packer element on an outer wall of said first packer tool to seal the outer wall of said first packer tool with the well thereby restricting communication around said first packer tool between a first zone below said first packer tool and a second zone immediately above said first packer tool; providing a first stinger attached to the top of said first packer tool for selectively inserting into a first retrieval tool; inserting a second packer tool in said well above said first packer tool, said second packer tool having a first internal passage communicating the second zone below said second packer tool with a third zone immediately above said second packer tool within said wellbore; said second packer tool having a first valve moveably seated in said first internal passage for preventing fluid flow from the third zone immediately above said packer tool to the second zone below said packer tool while continuously allowing fluid flow from the second zone to the third whenever the pressure in the second zone is higher than the third zone; fixing said second packer tool at the location above said first packer tool by expanding at least one packer element on an outer wall of said second packer tool to seal the outer wall of said second packer tool with the well thereby restricting communication between the third zone and the second zone; providing said first retrieval tool attached to the bottom of said second packer tool for selectively attaching to said first stinger; providing a second stinger attached to the top of said second packer tool for receiving a second retrieval tool; lowering a second retrieval tool into said well until said second retrieval tool contacts said second stinger; locking said second retrieval tool onto said second stinger; releasing at least one packer element from said second packer tool to release said second packer tool from said affixed position above said first packer tool; lowering said second packer element until said first retrieval tool contacts said first stinger; locking said first retrieval tool onto said first stinger; releasing at least one packer element from said first packer tool to release said first packer tool from the first packer tool predetermined position.