Multiple depth of investigation nuclear magnetic resonance logging for determining the porosity and pore type of subterranean formations
US-2018347351-A1 · Dec 6, 2018 · US
Absolute porosity and pore size determination of pore types in media with varying pore sizes
US10288571B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10288571-B2 |
| Application number | US-201815913171-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 6, 2018 |
| Priority date | Mar 7, 2017 |
| Publication date | May 14, 2019 |
| Grant date | May 14, 2019 |
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Abstract
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The longitudinal relaxation times (T1) of water and hydrocarbon inside porous media, such as rock from subsurface formations, behave differently when external magnetic fields vary. A Nuclear Magnetic Relaxation Dispersion (NMRD) profile from Fast Field Cycling Nuclear Magnetic Resonance (FFC-NMR) technique differentiates the type of fluids filling the pores. Different types of pores in a rock sample are filled with different fluids, water and hydrocarbon, and the absolute porosity and the pore size of each type of pores is determined.
First claim
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What is claimed is: 1. A method of obtaining a measure of porosity and pore size in a rock sample from a subsurface hydrocarbon reservoir, comprising the steps of: obtaining nuclear magnetic resonance relaxation times of the rock sample fully saturated with water, obtaining a nuclear magnetic resonance dispersion profile of the rock sample at irreducible water saturation; identifying pore types in the pores of the rock sample based on the obtained nuclear magnetic resonance dispersion profile of the rock sample at irreducible water saturation; determining porosity of the identified pore types based on the nuclear magnetic resonance relaxation times; and determining pore size of the identified pore types based on the nuclear magnetic resonance relaxation times. 2. The method of claim 1 , further including the step of fully saturating the rock sample prior to the step of obtaining nuclear magnetic resonance relaxation times of the rock sample fully saturated with water. 3. The method of claim 2 , further including the step of cleaning the rock sample to obtain a water-wet rock sample prior to the step of fully saturating the rock sample with water. 4. The method of claim 1 , further including the step of conducting forced drainage of the rock sample to obtain irreducible water saturation of the rock sample. 5. The method of claim 1 , wherein the step of obtaining a nuclear magnetic resonance dispersion profile of the rock sample comprises fast field cycling nuclear magnetic resonance relaxometry. 6. The method of claim 1 , wherein the rock sample comprises a carbonate rock. 7. A method of obtaining a measure of connectivity between pores in a rock sample, comprising the steps of: obtaining nuclear magnetic resonance relaxation times of the rock sample fully saturated with water; obtaining a nuclear magnetic resonance dispersion profile of the rock sample at irreducible water saturation; identifying pore types in the pores of the rock sample based on the obtained nuclear magnetic resonance dispersion profile of the rock sample at irreducible water saturation; determining porosity of the identified pore types based on the nuclear magnetic resonance relaxation times; and determining pore size of the identified pore types based on the nuclear magnetic resonance relaxation times.
Assignees
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Classifications
Investigating volume, surface area, size or distribution of pores; Porosimetry · CPC title
- G01N24/081Primary
Making measurements of geologic samples, e.g. measurements of moisture, pH, porosity, permeability, tortuosity or viscosity · CPC title
Relaxometry, i.e. quantification of relaxation times or spin density (G01R33/50 takes precedence) · CPC title
NMR spectroscopy · CPC title
Sequences for NMR spectroscopy of samples with ultrashort relaxation times such as solid samples · CPC title
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- What does patent US10288571B2 cover?
- The longitudinal relaxation times (T1) of water and hydrocarbon inside porous media, such as rock from subsurface formations, behave differently when external magnetic fields vary. A Nuclear Magnetic Relaxation Dispersion (NMRD) profile from Fast Field Cycling Nuclear Magnetic Resonance (FFC-NMR) technique differentiates the type of fluids filling the pores. Different types of pores in a rock s…
- Who is the assignee on this patent?
- Saudi Arabian Oil Co
- What technology area does this patent fall under?
- Primary CPC classification G01N24/081. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue May 14 2019 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 4 related publications on this page (citations in our corpus or others sharing the same primary CPC).