US 11,686,175 B2
Behind casing wash and cement
Lars Hovda, Tananger (NO); Dan Mueller, Houston, TX (US); James C. Stevens, Houston, TX (US); Amal Phadke, Houston, TX (US); and Praveen Gonuguntla, San Antonio, TX (US)
Assigned to CONOCOPHILLIPS COMPANY, Houston, TX (US)
Filed by CONOCOPHILLIPS COMPANY, Houston, TX (US)
Filed on Aug. 19, 2021, as Appl. No. 17/406,669.
Claims priority of provisional application 63/112,427, filed on Nov. 11, 2020.
Claims priority of provisional application 63/112,448, filed on Nov. 11, 2020.
Claims priority of provisional application 63/112,440, filed on Nov. 11, 2020.
Claims priority of provisional application 63/067,599, filed on Aug. 19, 2020.
Prior Publication US 2022/0056782 A1, Feb. 24, 2022
Int. Cl. E21B 33/14 (2006.01); E21B 41/00 (2006.01); E21B 37/00 (2006.01); E21B 33/13 (2006.01)
CPC E21B 33/14 (2013.01) [E21B 33/13 (2013.01); E21B 37/00 (2013.01); E21B 41/0078 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A method of performing a plug and abandon operation in an oil or gas well having a casing, the method including:
a. passing through the casing a bottom hole assembly comprising a generally cylindrical wash tool having a plurality of wash fluid nozzles and, axially connected to the wash tool, a generally cylindrical cementing tool having one or more cement nozzles, wherein the outer diameter of the wash tool is less than the outer diameter of the cementing tool, and the outer diameter of the wash tool is about 2.54 cm to 10.16 cm smaller than the drift diameter of the casing and the outer diameter of the cementing tool is about 0.64 cm to 2.54 cm smaller than the drift diameter of the casing;
b. delivering wash fluid through apertures in the casing into a region outside the casing; and
c. delivering cement through the apertures into the region outside the casing.