Permanent plug and abandonment plug established and verified with overdisplaced cement in A-annulus

摘要

Method of installing a verified bridge plug at a downhole location in a well having a first seal 6 between the casing and the tubing 4. Setting a second seal 12 within the tubing proximate to the first seal 6, and opening passages 13 through the tubing 4 into the A-annulus above both the first seal 6 and second seal 12. A wet sealant is pumped into the tubing above the second seal 12: the sealant fills the tubing 4 to a first height above the passages 13 and flows through the passages 13 to fill the A-annulus to a second height greater than the first height. The sealant in the A-annulus between the first and second heights is over-displaced sealant. After the sealant has set, the over-displaced sealant is pressure tested to determine its integrity and further sequences of sealing can be performed to create the PP&A permanent plug and abandonment seal. The plug can be set without any control cables 30 present in the annulus or with the control cable 30 only partially present in the annulus. Tubing cement and A-annulus cement can be delivered through the tubing as discrete plugs with burst valves (figs 9-11).