公开(公告)号：US10481291B2

公开(公告)日：2019-11-19

申请号：US15448183

申请日：2017-03-02

Applicant: SHELL OIL COMPANY

Inventor： Matthias Appel ,  Benjamin Charles Anger ,  Hilko de Jong ,  Lynn Faith Gladden ,  Michael David Mantle ,  Andrew John Sederman ,  Nicholas Philip Ramskill

IPC: G01V3/00 ,  G01V3/32 ,  E21B47/00 ,  E21B49/06 ,  E21B49/10 ,  G01N24/08 ,  G01R33/48 ,  G01R33/561 ,  E21B47/06

Abstract: An imager and method for imaging fluid of a subsurface formation is disclosed. The imager includes a housing having a sidewall defining a passage to receive a core sample of the subsurface formation therethrough. The housing is positioned in a downhole tool and has a fluid inlet to receive fluid from the subsurface formation into the passage. The imager also includes a permanent magnet positioned in the sidewall of the housing, a radio frequency coil positioned in the sidewall of the housing between the permanent magnet and the passage, a gradient field in the sidewall of the housing between the permanent magnet and the radio frequency coil, and a chemically-selective imager. The chemically-selective imager is operatively connected to the radio frequency coil to selectively pulse frequencies according to a pulse sequence whereby individual fluid measurements of the sample are generated.

公开(公告)号：US11879825B2

公开(公告)日：2024-01-23

申请号：US17414421

申请日：2019-12-16

Applicant: SHELL OIL COMPANY

Inventor： Nishank Saxena ,  Amie Marie Hows ,  Ronny Hofmann ,  Matthias Appel ,  John Justin Freeman

IPC: G01N15/08 ,  G06T7/11 ,  G01N23/046 ,  G01N23/083 ,  G01N33/24

CPC classification number: G01N15/08 ,  G01N23/046 ,  G01N23/083 ,  G01N33/24 ,  G06T7/11 ,  G01N2015/0846 ,  G01N2223/04 ,  G01N2223/419 ,  G01N2223/616 ,  G06T2207/10081 ,  G06T2207/20081 ,  G06T2207/30181

Abstract: The present invention provides a method for estimating the permeability of rock from a digital image of the rock. A three-dimensional image of a rock is obtained and segmented, and an image permeability is determined from the segmented image of the rock. Permeability correction factors are obtained from the segmented image and from a non-wetting liquid capillary pressure curve derived from the segmented image, and the permeability correction parameters are applied to the image permeability to obtain a corrected image permeability of the rock.

公开(公告)号：US10001395B2

公开(公告)日：2018-06-19

申请号：US15103429

申请日：2014-12-05

Applicant: SHELL OIL COMPANY

Inventor： Matthias Appel ,  John Justin Freeman

IPC: G01F1/56 ,  G01V3/00 ,  G06F19/00 ,  G01R33/44 ,  G01F1/716 ,  G01F1/74 ,  G01F25/00

CPC classification number: G01F1/716 ,  G01F1/74 ,  G01F25/0007

Abstract: A method for assessing a gas phase in a flowing multi-phase fluid comprises flowing the fluid through magnetic resonance and pre-polarization modules and applying to the fluid a radio-frequency pulse sequence at least once with and at least once without a magnetic field gradient. The method further includes measuring an NMR signal. The method also includes using a calibration between the ratio of slope and intercept of the NMR signal and flow velocity for at least one non-gas phase with the gradient applied to determine that phase's velocity. A calibration between the signal intensity of the liquid phases as function of flow velocity is used, with and without gradient, to correct the gradient-induced attenuation of the liquid signals and to calculate a gradient-corrected signal intensity of the liquid phases without a magnetic field gradient. Additionally, the method includes subtracting the gradient-corrected signal intensity from the NMR signal to calculate the volumetric fraction of the liquid phase.

公开(公告)号：US11119025B2

公开(公告)日：2021-09-14

申请号：US16567197

申请日：2019-09-11

Applicant: SHELL OIL COMPANY

Inventor： Nishank Saxena ,  Amie Marie Hows ,  Ronny Hofmann ,  Matthias Appel ,  John Justin Freeman

IPC: G06K9/00 ,  G01N15/08 ,  G01N23/046 ,  G06T7/11 ,  G06T7/62

Abstract: The present invention provides a method for determining the porosity of rock from a digital image of the rock. A three-dimensional image of a rock is obtained and segmented, and an image porosity is determined from the segmented image of the rock. A porosity correction parameter is obtained from a non-wetting liquid capillary pressure curve derived from the segmented image, and the porosity correction parameter is applied to the image porosity to obtain a corrected porosity of the rock.