公开(公告)号：US10527565B2

公开(公告)日：2020-01-07

申请号：US14811906

申请日：2015-07-29

Applicant: Chevron U.S.A. Inc.

Inventor： Scott Jeffrey Seltzer ,  Haijing Wang ,  Boqin Sun

IPC: G01N24/08 ,  G01R33/383 ,  G01V3/14 ,  G01R33/3875 ,  G01R33/44

Abstract: A sensor and a method are disclosed for analyzing fluid and/or rock samples from a subsurface formation. Embodiments of the sensor and method utilize an array of magnets arranged in a specific way. The array and its arrangement may allow for NMR analysis of multiple samples or analysis of fluid samples which were not possible with existing technology. Further details and advantages of various embodiments of the method are described in more detail herein.

公开(公告)号：US20170285215A1

公开(公告)日：2017-10-05

申请号：US15472897

申请日：2017-03-29

Applicant: Chevron U.S.A. Inc.

Inventor： Haijing Wang ,  Boqin Sun ,  Scott J. Seltzer ,  John S. Zintsmaster ,  Hussein Alboudwarej

IPC: G01V3/32 ,  G01R33/46 ,  G01R33/31

CPC classification number: G01R33/46 ,  G01N24/081 ,  G01R33/305 ,  G01R33/31 ,  G01R33/448

Abstract: To measure the phase behavior of a fluid in a porous medium such as a tight gas shale, one illustrative method involves: (a) loading the fluid into a sample cell containing the porous medium; (b) setting a pressure and a temperature for the fluid in the sample cell; (c) applying an RF pulse sequence to the fluid in the sample cell to acquire an NMR signal; (d) deriving from the NMR signal an NMR parameter distribution that depends on the pressure and the temperature; (e) determining whether a fluid phase is present based on the NMR parameter distribution; (f) repeating operations (c) through (f) to determine the presence or absence of the fluid phase at multiple points along a pressure-temperature path that crosses a phase boundary; and (g) providing an estimated location of the phase boundary based on the presence or absence of the fluid phase at said points.

公开(公告)号：US20170030845A1

公开(公告)日：2017-02-02

申请号：US14811906

申请日：2015-07-29

Applicant: Chevron U.S.A. Inc.

Inventor： Scott Jeffrey Seltzer ,  Haijing Wang ,  Boqin Sun

IPC: G01N24/08

CPC classification number: G01N24/081 ,  G01R33/383 ,  G01R33/3875 ,  G01R33/448 ,  G01V3/14

Abstract: A sensor and a method are disclosed for analyzing fluid and/or rock samples from a subsurface formation. Embodiments of the sensor and method utilize an array of magnets arranged in a specific way. The array and its arrangement may allow for NMR analysis of multiple samples or analysis of fluid samples which were not possible with existing technology. Further details and advantages of various embodiments of the method are described in more detail herein.

Abstract translation: 公开了用于从地下地层分析流体和/或岩石样品的传感器和方法。 传感器和方法的实施例利用以特定方式布置的磁体阵列。 阵列及其布置可以允许对多个样品的NMR分析或对现有技术不可能的流体样品的分析。 本文更详细地描述了该方法的各种实施例的进一步细节和优点。

公开(公告)号：US10996364B2

公开(公告)日：2021-05-04

申请号：US15948702

申请日：2018-04-09

Applicant: Chevron U.S.A. Inc.

Inventor： Haijing Wang ,  Hanming Wang ,  Emmanuel Toumelin

IPC: G01V3/20 ,  G01V3/32 ,  G01V3/38 ,  G01N27/02 ,  G01N15/08 ,  G01N33/24

Abstract: A method for determining water-filled porosity and water salinity in a well includes obtaining complex dielectric permittivity of earth formations, either from dielectric measurements representative of well cores, or from dielectric well logs; selecting a dielectric mixing law for the index number m; plotting a m-th root of complex dielectric permittivity at a specified frequency in the complex domain, wherein m is an index number; determining a matrix permittivity, a water salinity, and a water-filled porosity based on the complex dielectric permittivity and the dielectric mixing law; and displaying the water salinity and the water-filled porosity.

公开(公告)号：US10228336B2

公开(公告)日：2019-03-12

申请号：US14841851

申请日：2015-09-01

Applicant: Chevron U.S.A. Inc.

Inventor： Scott J. Seltzer ,  Boqin Sun ,  Haijing Wang

IPC: G01N24/08 ,  G01R33/44 ,  G01V3/32 ,  G01R33/38 ,  G01R33/341 ,  G01R33/383

Abstract: An NMR sensor and method is disclosed for analyzing a core sample from a subsurface formation. Embodiments of the method utilize two or more magnets disposed proximate to each other. The configuration of the magnets allows for increased detection frequency, and creates a strong field with much finer resolution than existing designs. In addition, embodiments of the sensor may be used at the well site due to its small size and simple hardware. Further details and advantages of various embodiments of the method are described in more detail herein.

公开(公告)号：US10145810B2

公开(公告)日：2018-12-04

申请号：US14673043

申请日：2015-03-30

Applicant: Chevron U.S.A. Inc.

Inventor： Haijing Wang ,  Scott Jeffrey Seltzer ,  Boqin Sun

IPC: G01N24/08 ,  G01R33/44 ,  G01V3/32

Abstract: A disclosed method for characterizing gas adsorption on a rock sample includes: measuring a nuclear magnetic resonance (NMR) response of the rock as a function of surrounding gas pressure along an isotherm; transforming the NMR response to obtain a Langmuir pressure distribution of gas adsorption on the rock sample; and displaying the Langmuir pressure distribution. The Langmuir pressure distribution may be shown in one dimension (e.g., contribution to signal response versus Langmuir pressure), or may be combined with additional pressure-dependencies such as spin-lattice relaxation time (T1), spin-spin relaxation time (T2), and chemical shift (δ) to form a multi-dimensional distribution. The method can further include: identifying peaks in the Langmuir pressure distribution; and associating a gas storage mechanism and capacity with each peak. It may still further include: exposing the rock sample to a treatment fluid to obtain an altered sample; repeating said measuring and transforming operations with the altered sample; and comparing the Langmuir pressure distributions to determine effects of the treatment.

公开(公告)号：US20170059497A1

公开(公告)日：2017-03-02

申请号：US14841851

申请日：2015-09-01

Applicant: Chevron U.S.A. Inc.

Inventor： Scott J. Seltzer ,  Boqin Sun ,  Haijing Wang

IPC: G01N24/08

CPC classification number: G01N24/081 ,  G01R33/341 ,  G01R33/3808 ,  G01R33/383 ,  G01R33/448

Abstract: An NMR sensor and method is disclosed for analyzing a core sample from a subsurface formation. Embodiments of the method utilize two or more magnets disposed proximate to each other. The configuration of the magnets allows for increased detection frequency, and creates a strong field with much finer resolution than existing designs. In addition, embodiments of the sensor may be used at the well site due to its small size and simple hardware. Further details and advantages of various embodiments of the method are described in more detail herein.

Abstract translation: 公开了用于从地下地层分析核心样品的NMR传感器和方法。 该方法的实施例利用彼此靠近设置的两个或更多个磁体。 磁体的配置允许增加检测频率，并创建比现有设计更精细的分辨率的强场。 此外，传感器的实施例可以由于其小尺寸和简单的硬件而在井位处使用。 本文更详细地描述了该方法的各种实施例的进一步细节和优点。