Stacey M Althaus

US Patent:

20230012861, Jan 19, 2023

Filed:

Jul 9, 2021

Appl. No.:

17/372161

Inventors:

- Houston TX, US
Stacey M. Althaus - Houston TX, US
HouZhu Zhang - Houston TX, US
Mohammed Boudjatit - El Kennar, DZ

Assignee:

ARAMCO SERVICES COMPANY - Houston TX
SAUDI ARABIAN OIL COMPANY - Dhahran

International Classification:

G01V 3/32
G01N 24/08
G01N 33/24
E21B 49/02
E21B 49/08

Abstract:

A method for determining maximum recoverable hydrocarbon (EMR) in a tight reservoir is disclosed. The method includes determining, based on downhole logs, a total measure of hydrocarbon amount within the tight reservoir, determining, by at least attributing fluid loss during core surfacing of the core sample to hydrocarbons, a non-recoverable measure of hydrocarbon amount within a core sample of the tight reservoir, and determining an EMR measure based on the total measure of hydrocarbon amount and the non-recoverable measure of hydrocarbon amount, wherein during the core surfacing pore pressure reduces from a reservoir condition to a surface condition.

US Patent:

20200284133, Sep 10, 2020

Filed:

May 26, 2020

Appl. No.:

16/883538

Inventors:

- Dhahran, SA
Daniel T. Georgi - Houston TX, US
Stacey M. Althaus - Houston TX, US

International Classification:

E21B 43/26
E21B 49/00

Abstract:

The present disclosure describes methods and systems for fracturing geological formations in a hydrocarbon reservoir. One method includes forming a borehole in a hydrocarbon reservoir from a surface of the hydrocarbon reservoir extending downward into the hydrocarbon reservoir; transmitting an electromagnetic (EM) wave through the borehole; directing at least a portion of the EM wave to rocks at a location below the surface in the hydrocarbon reservoir; and fracturing the rocks at the location below the surface in the hydrocarbon reservoir by irradiating the rocks around the borehole using at least the portion of the EM wave, where the irradiating is performed by irradiating a first portion of the rocks by using the EM wave for a first duration and after irradiating the first portion of the rocks for the first duration, refraining from irradiating the first portion of the rocks for a second duration.

US Patent:

20200102824, Apr 2, 2020

Filed:

Oct 2, 2018

Appl. No.:

16/149401

Inventors:

Jin-Hong Chen - Katy TX, US
Stacey M. Althaus - Houston TX, US

International Classification:

E21B 49/08
G01V 3/38
G01V 3/32

Abstract:

Techniques for determining geologic formation permeability include determining particular permeability values from an NMR log permeability data and particular permeability values of the core permeability measurements; determining a selected NMR permeability transform that includes inputs including the determined particular permeability values; minimizing a cost function to optimize the selected NMR permeability transform; calculating new permeability values for the wellbore between the terranean surface and a true vertical depth of the wellbore with the optimized NMR permeability transform; comparing the calculated new permeability values at particular depths between the terranean surface and the true vertical depth that match depths of the core permeability measurements; based on the comparison meeting a particular threshold, generating a user interface that renders one or more graphical representations of the optimized NMR permeability transform and the calculated new permeability values; and transmitting data that represents the one or more graphical representations.

US Patent:

20190331825, Oct 31, 2019

Filed:

Jul 11, 2019

Appl. No.:

16/508944

Inventors:

- Dhahran, SA
Stacey Marie Althaus - Houston TX, US
Jin-Hong Chen - Katy TX, US

International Classification:

G01V 3/32
G01N 24/08
G01N 15/08

Abstract:

Herein methods and systems for determining matrix or grain density of a subsurface formation are described. This includes measuring in-air mass of a fluid-saturated sample of the subsurface formation, wherein the in-air mass comprises mass of matrix or grains of the sample, mass of a fluid surrounding the sample, and mass of the fluid inside the sample. The volume of the fluid inside the sample, V, and volume of the fluid surrounding the sample, V, are determined using nuclear magnetic resonance (NMR). The fluid-saturated sample can then be submerged in a predetermined volume of a weighing fluid and mass of the fluid-saturated sample without the surrounding fluid in the weighing fluid, mis measured. Using the measured and determined values one can determine the volume of the sample without the surrounding fluid, V, the bulk density of the fluid-saturated sample without the surrounding fluid, ρ, the volume of the matrix, V, and the matrix or grain density of the subsurface formation, ρ.

US Patent:

20190331826, Oct 31, 2019

Filed:

Jul 11, 2019

Appl. No.:

16/508985

Inventors:

- Dhahran, SA
Stacey Marie Althaus - Houston TX, US
Jin-Hong Chen - Katy TX, US

International Classification:

G01V 3/32
G01N 24/08
G01N 15/08

Abstract:

Herein methods and systems for determining matrix or grain density of a subsurface formation are described. This includes measuring in-air mass of a fluid-saturated sample of the subsurface formation, wherein the in-air mass comprises mass of matrix or grains of the sample, mass of a fluid surrounding the sample, and mass of the fluid inside the sample. The volume of the fluid inside the sample, V, and volume of the fluid surrounding the sample, V, are determined using nuclear magnetic resonance (NMR). The fluid-saturated sample can then be submerged in a predetermined volume of a weighing fluid and mass of the fluid-saturated sample without the surrounding fluid in the weighing fluid, mis measured. Using the measured and determined values one can determine the volume of the sample without the surrounding fluid, V, the bulk density of the fluid-saturated sample without the surrounding fluid, ρ, the volume of the matrix, V, and the matrix or grain density of the subsurface formation, ρ.

US Patent:

20190049616, Feb 14, 2019

Filed:

Aug 10, 2017

Appl. No.:

15/673996

Inventors:

- Dhahran, SA
Stacey Marie Althaus - Houston TX, US
Jin-Hong Chen - Katy TX, US

International Classification:

G01V 3/32
G01N 15/08

Abstract:

Herein methods and systems for determining matrix or grain density of a subsurface formation are described. This includes measuring in-air mass of a fluid-saturated sample of the subsurface formation, wherein the in-air mass comprises mass of the sample, mass of a fluid surrounding the sample, and mass of the fluid inside the sample. The volume of the fluid inside the sample, V, and volume of the fluid surrounding the sample, V, are determined using nuclear magnetic resonance (NMR). The sample can then be submerged in a predetermined volume of a weighing fluid and the mass of the fluid-saturated sample in the weighing fluid, mis measured. Using the measured and determined values one can determine the volume of the sample, V, the bulk density of the sample, ρ, the volume of the matrix, V, and the matrix or grain density of the subsurface formation, ρ.

US Patent:

20180217073, Aug 2, 2018

Filed:

Jan 17, 2018

Appl. No.:

15/873576

Inventors:

- Dhahran, SA
Stacey M. Althaus - Houston TX, US
Mohammad Delshad - Houston TX, US
Yang Zhao - Katy TX, US

Assignee:

Saudi Arabian Oil Company - Dhahran

International Classification:

G01N 24/08
G01R 33/24
G01R 33/46
G01R 33/34
G01V 3/32

Abstract:

Certain techniques for Nuclear Magnetic Resonance (NMR) whole core logging are described. NMR tests are performed on a standard sample using a NMR radio frequency (rf) coil having a length. A response map of the NMR rf coil is determined. The response map relates multiple relative NMR rf coil positions to multiple relative signal intensities. The NMR tests are performed using the NMR rf coil on a rock sample containing fluid. A length of the rock sample is greater than the NMR rf coil. Fluid content in the sample is determined using results of the NMR tests using the NMR rf coil on the rock sample and using the response map for the NMR rf coil and a mathematical deconvolution to obtain high resolution. The same method can be used to obtain high spatial resolution NMR log measurement in the reservoir.