公开(公告)号：US11808138B2

公开(公告)日：2023-11-07

申请号：US17287542

申请日：2019-10-24

Applicant: Schlumberger Technology Corporation

Inventor： Yevgeniy Karpekin ,  Heri Tanjung ,  Ashish Datey ,  Gustavo Dip ,  David Rose

IPC: E21B47/06 ,  G01V5/10

CPC classification number: E21B47/06 ,  G01V5/102

Abstract: A method for determining the gas pressure may include generating, via a downhole tool, neutron radiation in a cased wellbore of a geological formation and measuring a response to the neutron radiation. The method may also include determining, via a processor, at least one of a sigma, a neutron porosity, or a fast-neutron cross-section of the formation. Additionally, an equation of state of the gas may be estimated, and a gas pressure of the gas may be determined by solving a relationship, based at least in part on the equation of state, between the gas pressure and the at least one of the sigma, the neutron porosity, or the fast-neutron cross-section.

公开(公告)号：US20210318461A1

公开(公告)日：2021-10-14

申请号：US17287542

申请日：2019-10-24

Applicant: Schlumberger Technology Corporation

Inventor： Yevgeniy Karpekin ,  Heri Tanjung ,  Ashish Datey ,  Gustavo Dip ,  David Rose

IPC: G01V5/10 ,  E21B47/06

Abstract: A method for determining the gas pressure may include generating, via a downhole tool, neutron radiation in a cased wellbore of a geological formation and measuring a response to the neutron radiation. The method may also include determining, via a processor, at least one of a sigma, a neutron porosity, or a fast-neutron cross-section of the formation. Additionally, an equation of state of the gas may be estimated, and a gas pressure of the gas may be determined by solving a relationship, based at least in part on the equation of state, between the gas pressure and the at least one of the sigma, the neutron porosity, or the fast-neutron cross-section.