US 12,297,714 B2
Fill up and circulation tool with return valve for inner string cementation
Dautmammet Rejepov, Abqaiq (SA)
Assigned to SAUDI ARABIAN OIL COMPANY, Dhahran (SA)
Filed by SAUDI ARABIAN OIL COMPANY, Dhahran (SA)
Filed on Sep. 12, 2023, as Appl. No. 18/465,368.
Prior Publication US 2025/0084721 A1, Mar. 13, 2025
Int. Cl. E21B 33/14 (2006.01); E21B 21/00 (2006.01); E21B 33/06 (2006.01); E21B 33/16 (2006.01)
CPC E21B 33/16 (2013.01) 10 Claims
OG exemplary drawing
 
1. A system for a wellbore, the system comprising:
a casing string configured to be deployed into the wellbore, wherein a casing-wellbore annulus, delineated by an external surface of the casing string and an internal surface of the wellbore, is created when the casing string enters the wellbore;
an inner string configured to deployed inside of the casing string, wherein a casing-inner string annulus, delineated by an external surface of the inner string and an internal surface of the casing string, is created when the inner string enters the casing string;
a light mud disposed in the casing-wellbore annulus and the casing-inner string annulus;
an inner string fill up tool connected to the inner string and configured to displace the light mud in the casing-inner string annulus with a heavy mud while leaving the light mud in the casing-wellbore annulus;
a packer connected to the inner string fill up tool and configured to seal against the internal surface of the casing string to block the casing-inner string annulus, wherein the packer comprises a return line having a return valve configured to open and close; and
an annular ram of a blow out preventor configured to close around the casing string and seal the casing-wellbore annulus, wherein the inner string fill up tool connected to the inner string is configured to displace the light mud inside the casing string with the heavy mud when the annular ram is closed, the packer is sealed against the internal surface of the casing string, and the return valve in the return line is open.