US 12,281,526 B2
Method and system for suspending a drill string and isolating a wellbore
Rae Younger, Aberdeenshire (GB); and Richard Mark Pye, Aberdeenshire (GB)
Assigned to SAUDI ARABIAN OIL COMPANY, Dhahran (SA)
Filed by SAUDI ARABIAN OIL COMPANY, Dhahran (SA)
Filed on Jul. 26, 2023, as Appl. No. 18/359,638.
Prior Publication US 2025/0034960 A1, Jan. 30, 2025
Int. Cl. E21B 23/02 (2006.01); E21B 33/134 (2006.01)
CPC E21B 23/02 (2013.01) [E21B 33/134 (2013.01)] 20 Claims
OG exemplary drawing
 
11. A method for abandoning a well, the method comprising:
drilling a wellbore with a drill string comprising a lower drill string and an upper drill string;
pulling the drill string out of the wellbore a predetermined length;
connecting a plug system to the lower drill string, the plug system comprising:
a body comprising two ends, a first end being connected to the lower drill string and a second end connected to the upper drill string, the body further comprising:
a sealing element configured to seal a reservoir pressure that is downhole from the plug system;
an anchoring element configured to releasably couple the plug system to the wellbore to disallow an axial movement of the plug system in the wellbore; and
a mandrel disabling pin coupled to a plug outer surface; wherein the mandrel disabling pin is configured to hold the anchoring element to the plug outer surface thereby disabling the anchoring element,
connecting, to the upper drill string, a retrieving tool comprising a first engagement element disposed at a tool first end, wherein the first engagement element is configured to couple to the plug system and configured to release the anchoring element thereby allowing the axial movement;
deploying the plug system into the wellbore;
anchoring the plug system in the wellbore using the anchoring element;
disengaging the first engagement element from the plug system;
pulling the upper drill string out of the wellbore; and
abandoning the well with the lower drill string in the well.