US 11,774,629 B2
Systems and methods for determining the presence of cement behind at least one casing using spectroscopy measurement
Pascal Millot, Abu Dhabi (AE); Adil Busaidy, Bucharest (RO); Jeffrey Miles, Arlington, MA (US); Tong Zhou, Sugar Land, TX (US); Christian Stoller, Sugar Land, TX (US); David Rose, Sugar Land, TX (US); and Richard Radtke, Pearland, TX (US)
Assigned to SCHLUMBERGER TECHNOLOGY CORPORATION, Sugar Land, TX (US)
Filed by Schlumberger Technology Corporation, Sugar Land, TX (US)
Filed on Aug. 30, 2021, as Appl. No. 17/460,825.
Application 17/460,825 is a continuation of application No. 16/263,603, filed on Jan. 31, 2019, granted, now 11,105,952.
Claims priority of provisional application 62/624,149, filed on Jan. 31, 2018.
Prior Publication US 2021/0389495 A1, Dec. 16, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. G01V 5/10 (2006.01); E21B 47/12 (2012.01)
CPC G01V 5/102 (2013.01) [E21B 47/12 (2013.01); G01V 5/104 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A method for identifying cement in a cased wellbore in a geological formation, wherein the cased wellbore includes at least one casing, the method comprising:
emitting neutrons using a downhole tool, wherein the neutrons interact with a particular material via inelastic scattering, inelastic neutron reactions, capture of neutrons, neutron activation, or any combination thereof, through one of these reactions and cause the particular material to emit an energy spectrum of gamma rays;
detecting, at a first location, a first energy spectrum of the gamma rays that is specific to at least one of the plurality of elements; and
determining a presence of cement at the first location based at least in part on the first energy spectrum.