公开(公告)号：US20180059283A1

公开(公告)日：2018-03-01

申请号：US15248962

申请日：2016-08-26

Applicant: SCHLUMBERGER TECHNOLOGY CORPORATION

Inventor： Libai Xu ,  Jiaxin Wang

IPC: G01V5/10 ,  G01V13/00

CPC classification number: G01V5/101 ,  G01V13/00

Abstract: A method for correcting natural gamma ray measurements includes processing an acquired gamma ray spectrum in combination with elemental standard spectra and at least one standard mud activation spectrum to compute corrected natural gamma ray measurements. The gamma ray spectrum is acquired using a logging string employing a neutron source and a natural gamma ray sensor.

公开(公告)号：US10451766B2

公开(公告)日：2019-10-22

申请号：US15537426

申请日：2015-12-17

Applicant: Schlumberger Technology Corporation

Inventor： Libai Xu ,  Wei Yang ,  Jiaxin Wang

IPC: G01V5/06 ,  E21B47/00 ,  E21B47/12 ,  G01V5/04 ,  G01V5/12

Abstract: Methods of elemental imaging of a formation include acquiring spectral gamma ray measurement, acquiring a total gamma ray image, deriving structure information of the formation from the total gamma ray image, and applying the structure information to the spectral gamma ray measurement to form an elemental image. In the present methods, the structure information of the formation is derived from comparing the total gamma ray logs for each azimuthal sector to a derived total gamma ray log. The derived total gamma ray log is acquired from the total gamma ray image by summing over all azimuth bins or the spectral gamma ray measurement by summing over all energy bins.

公开(公告)号：US09823384B1

公开(公告)日：2017-11-21

申请号：US15248879

申请日：2016-08-26

Applicant: SCHLUMBERGER TECHNOLOGY CORPORATION

Inventor： Jiaxin Wang ,  Libai Xu ,  Christian Stoller

IPC: G01V5/10 ,  G01F1/00 ,  E21B47/12 ,  E21B47/00 ,  E21B49/00 ,  E21B47/10

CPC classification number: G01V5/101 ,  E21B47/10 ,  E21B47/124 ,  E21B49/003 ,  G01F1/7042

Abstract: A method for estimating a drilling fluid flow rate in a subterranean wellbore includes processing an acquired gamma ray spectrum in combination with standard elemental spectra and at least one standard oxygen activation spectrum to compute an oxygen activation yield. The oxygen activation yield is further processed to estimate a drilling fluid flow rate and or to infer a borehole diameter change or a lost circulation event. The gamma ray spectrum is acquired using a logging string employing a neutron source and a natural gamma ray sensor.

公开(公告)号：US10101493B2

公开(公告)日：2018-10-16

申请号：US15248962

申请日：2016-08-26

Applicant: SCHLUMBERGER TECHNOLOGY CORPORATION

Inventor： Libai Xu ,  Jiaxin Wang

IPC: G01V13/00 ,  G01V5/10

Abstract: A method for correcting natural gamma ray measurements includes processing an acquired gamma ray spectrum in combination with elemental standard spectra and at least one standard mud activation spectrum to compute corrected natural gamma ray measurements. The gamma ray spectrum is acquired using a logging string employing a neutron source and a natural gamma ray sensor.

公开(公告)号：US20180267199A1

公开(公告)日：2018-09-20

申请号：US15537426

申请日：2015-12-17

Applicant: Schlumberger Technology Corporation

Inventor： Libai Xu ,  Wei Yang ,  Jiaxin Wang

IPC: G01V5/06 ,  G01V5/12 ,  E21B47/00 ,  E21B47/12 ,  G01V5/04

CPC classification number: G01V5/06 ,  E21B47/0002 ,  E21B47/12 ,  G01V5/045 ,  G01V5/12

Abstract: Methods of elemental imaging of a formation include acquiring spectral gamma ray measurement, acquiring a total gamma ray image, deriving structure information of the formation from the total gamma ray image, and applying the structure information to the spectral gamma ray measurement to form an elemental image. In the present methods, the structure information of the formation is derived from comparing the total gamma ray logs for each azimuthal sector to a derived total gamma ray log. The derived total gamma ray log is acquired from the total gamma ray image by summing over all azimuth bins or the spectral gamma ray measurement by summing over all energy bins.