公开(公告)号：US11774629B2

公开(公告)日：2023-10-03

申请号：US17460825

申请日：2021-08-30

Applicant: Schlumberger Technology Corporation

Inventor： Pascal Millot ,  Adil Busaidy ,  Jeffrey Miles ,  Tong Zhou ,  Christian Stoller ,  David Rose ,  Richard Radtke

IPC: G01V5/10 ,  E21B47/12

CPC classification number: G01V5/102 ,  E21B47/12 ,  G01V5/104

Abstract: A presence of cement may be identified based on a downhole tool that may emit neutrons into a wellbore having at least one cement casing. The neutrons may interact with the particular material via inelastic scattering, inelastic neutron reactions, capture of neutrons and/or neutron activation through one of these reactions and cause a material to emit an energy spectrum of gamma rays, and wherein the downhole tool is configured to detect an energy spectrum of the gamma rays that is specific to at least one of a plurality of elements and associated a region within the wellbore. An amount of elements, such as calcium and silicon, may be determined from the gamma ray spectra that may indicate a present of cement within the wellbore.

公开(公告)号：US20190383962A1

公开(公告)日：2019-12-19

申请号：US16442302

申请日：2019-06-14

Applicant: Schlumberger Technology Corporation

Inventor： Tong Zhou ,  David Rose ,  Jeffrey Miles

IPC: G01V5/10

Abstract: Elemental concentrations in subterranean formations may be determined using neutron spectroscopy. For example, neutrons may be emitted by a downhole tool into the formation and produce gamma rays via inelastic scattering of fast neutrons or capture of slow neutrons. The borehole surrounding a downhole tool may introduce artifacts in the neutron spectroscopy measurement. Embodiments of the present disclosure are directed to techniques that reduce artifacts signals in downhole tools that include one or multiple detectors based at least in part on the inelastic and capture measurements.

公开(公告)号：US20180210110A1

公开(公告)日：2018-07-26

申请号：US15894023

申请日：2018-02-12

Applicant: Schlumberger Technology Corporation

Inventor： Kenneth E. Stephenson ,  David Rose ,  Avtandil Tkabladze ,  Christian Stoller ,  John J. Simonetti

IPC: G01V5/10

CPC classification number: G01V5/104 ,  G01V5/101

Abstract: Systems, methods, and devices for inelastic gamma-ray logging are provided. In one embodiment, such a method includes emitting neutrons into a subterranean formation from a downhole tool to produce inelastic gamma-rays, detecting a portion of the inelastic gamma-rays that scatter back to the downhole tool to obtain an inelastic gamma-ray signal, and determining a property of the subterranean formation based at least in part on the inelastic gamma-ray signal. The inelastic gamma-ray signal may be substantially free of epithermal and thermal neutron capture background.