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：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：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。