Rock specimen and method for testing direct tensile strength of the same
US-2016103047-A1 · Apr 14, 2016 · US
Determining rock properties
US10048179B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10048179-B2 |
| Application number | US-201615097924-A |
| Country | US |
| Kind code | B2 |
| Filing date | Apr 13, 2016 |
| Priority date | Apr 13, 2016 |
| Publication date | Aug 14, 2018 |
| Grant date | Aug 14, 2018 |
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Abstract
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Techniques for determining rock properties include exerting a compressive load with a test apparatus across a rock sample that includes a specified length-to-diameter ratio; measuring, with a strain gauge, a strain on the rock sample during the compressive loading; determining, based at least in part on the compressive load, a mechanical property of the rock sample; and determining, based at least in part on the measured strain and the compressive load, an elastic property of the rock sample.
First claim
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What is claimed is: 1. A method for determining rock properties, comprising: exerting a compressive load with a Brazilian test apparatus across a rock sample that comprises a specified length-to-diameter ratio; measuring, with the Brazilian test apparatus, a tensile strength of the rock sample based on the compressive load; measuring, with at least one strain gauge that is coupled to an axial surface of the rock sample, a strain on the rock sample during the compressive loading, the measuring comprising: measuring an incremental axial strain on the rock sample during a compressive load increment with a first strain gauge, and measuring an incremental radial strain on the rock sample during the compressive load increment with a second strain gauge; determining, based at least in part on the compressive load, a mechanical property of the rock sample; and determining, based at least in part on the measured strain and the compressive load, an elastic property of the rock sample, the determining comprising: determining a first coefficient based at least in part on the diameter of the rock sample, the length of the rock sample, and an effective length of the first and second strain gauges, determining a second coefficient based at least in part on the diameter of the rock sample, the length of the rock sample, and the effective length of the first and second strain gauges, and determining the elastic property of the rock sample based at least in part on the measured incremental axial and radial strains on the rock sample, the first and second coefficients, and the compressive loading increment. 2. The method of claim 1 , wherein the specified length-to-diameter ratio is between 0.2 and 0.75. 3. The method of claim 1 , wherein determining, based at least in part on the measured strain and the compressive load, the elastic property of the rock sample comprises determining a Young's modulus of the rock sample based on at least one of: E = Δ P Δ ɛ x ( - F + vG ) , ( i ) where E is stress dependent Young's modulus of the rock sample, ΔP is the compressive loading increment, Δϵ x is the incremental radial strain, υ is Poisson's ratio of the rock sample, F is a first coefficient, and G is a second coefficient; or E = P ɛ x ( - F + vG ) , ( ii ) where E is Young's modulus of the rock sample, P is a particular compressive load, ϵ x is a radial strain at the particular compressive load, υ is Poisson's ratio of the rock sample, F is the first coefficient, and G is the second coefficient. 4. The method of claim 1 , wherein determining, based at least in part on the measured strain and the compressive load, the elastic property of the rock sample comprises determining Poisson's ratio of the rock sample based on at least one of: υ = ( Δ ɛ x Δɛ y ) G + F ( Δ ɛ x Δɛ y )
Assignees
Inventors
Classifications
- G01N3/08Primary
by applying steady tensile or compressive forces (G01N3/28 takes precedence) · CPC title
Strain-stress relations or elastic constants · CPC title
Resistance to crushing · CPC title
Earth materials (G01N33/42 takes precedence) · CPC title
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- What does patent US10048179B2 cover?
- Techniques for determining rock properties include exerting a compressive load with a test apparatus across a rock sample that includes a specified length-to-diameter ratio; measuring, with a strain gauge, a strain on the rock sample during the compressive loading; determining, based at least in part on the compressive load, a mechanical property of the rock sample; and determining, based at le…
- Who is the assignee on this patent?
- Saudi Arabian Oil Co
- What technology area does this patent fall under?
- Primary CPC classification G01N3/08. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Aug 14 2018 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 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).