METHODS AND SYSTEMS FOR DETERMINING BULK DENSITY, POROSITY, AND PORE SIZE DISTRIBUTION OF SUBSURFACE FORMATIONS
First Claim
1. A method for characterization of a subsurface formation, the method comprising:
- 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 in-air mass of the fluid-saturated sample, ms, given by the formula;
ms=Vmρ
m+(Vϕ
+Vsur)ρ
l where ρ
m is a density of the matrix of the subsurface formation, ρ
l is a density of the fluid inside and surrounding the sample, Vm is a volume of the matrix, Vϕ
is a volume of the fluid inside the sample, and Vsur is a volume of the fluid surrounding the sample;
determining volume of the fluid inside the sample, Vϕ
, and volume of the fluid surrounding the sample, Vsur, using nuclear magnetic resonance (NMR);
placing the sample in a predetermined volume of a weighing fluid;
measuring the mass of the fluid-saturated sample in the weighing fluid, the mass of the sample in the weighing fluid, mf, given by the formula;
mf=Vmρ
m+Vϕ
ρ
l−
Vcρ
f where ρ
f is the density of the weighing fluid; and
determining a volume of the sample, Vc, using the formula;
Vc=(ms−
mf−
Vsurρ
l)/ρ
f.
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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, Vϕ, and volume of the fluid surrounding the sample, Vsur, 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, mf is measured. Using the measured and determined values one can determine the volume of the sample, Vc, the bulk density of the sample, ρb, the volume of the matrix, Vm, and the matrix or grain density of the subsurface formation, ρm.
1 Citation
17 Claims
-
1. A method for characterization of a subsurface formation, the method comprising:
-
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 in-air mass of the fluid-saturated sample, ms, given by the formula;
ms=Vmρ
m+(Vϕ
+Vsur)ρ
lwhere ρ
m is a density of the matrix of the subsurface formation, ρ
l is a density of the fluid inside and surrounding the sample, Vm is a volume of the matrix, Vϕ
is a volume of the fluid inside the sample, and Vsur is a volume of the fluid surrounding the sample;determining volume of the fluid inside the sample, Vϕ
, and volume of the fluid surrounding the sample, Vsur, using nuclear magnetic resonance (NMR);placing the sample in a predetermined volume of a weighing fluid; measuring the mass of the fluid-saturated sample in the weighing fluid, the mass of the sample in the weighing fluid, mf, given by the formula;
mf=Vmρ
m+Vϕ
ρ
l−
Vcρ
fwhere ρ
f is the density of the weighing fluid; anddetermining a volume of the sample, Vc, using the formula;
Vc=(ms−
mf−
Vsurρ
l)/ρ
f. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A non-transitory computer-readable medium having computer executable instructions that trigger a computer to perform the operations of:
-
receiving 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 in-air mass of the fluid-saturated sample, ms, given by the formula;
ms=Vmρ
m+(Vϕ
+Vsur)ρ
lwhere ρ
m is a density of the matrix of the subsurface formation, ρ
l is a density of the fluid inside and surrounding the sample, Vm is a volume of the matrix, Vϕ
is a volume of the fluid inside the sample, and Vsur is a volume of the fluid surrounding the sample;determining volume of the fluid inside the sample, Vϕ
, and volume of the fluid surrounding the sample, Vsur, using nuclear magnetic resonance (NMR);receiving mass of the fluid-saturated sample in a weighing fluid, the mass of the sample in the weighing fluid, mf, given by the formula;
mf=Vmρ
m+Vϕ
ρ
l−
Vcρ
fwhere ρ
f is the density of the weighing fluid; anddetermining a volume of the sample, Vc, using the formula;
Vc=(ms−
mf−
Vsurρ
l)/ρ
f. - View Dependent Claims (11, 12, 13)
-
-
14. A system for characterization of a subsurface formation, the system comprising:
-
a fluid-saturated sample of a subsurface formation; a balance configured to receive the fluid-saturated sample and output the in-air mass of the sample; a computer comprising one or more processors and a non-transitory computer readable medium comprising computer executable instructions that when executed by the one or more processors, trigger the computer to; receive 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 in-air mass of the fluid-saturated sample, ms, given by the formula;
ms=Vmρ
m+(Vϕ
+Vsur)ρ
lwhere ρ
m is a density of the matrix of the subsurface formation, ρ
l is a density of the fluid inside and surrounding the sample, Vm is a volume of the matrix, Vϕ
is a volume of the fluid inside the sample, and Vsur is a volume of the fluid surrounding the sample;determine volume of the fluid inside the sample, Vϕ
, and volume of the fluid surrounding the sample, Vsur, using nuclear magnetic resonance (NMR);receive mass of the fluid-saturated sample in a weighing fluid, the mass of the sample in the weighing fluid, mf, given by the formula
mf=Vmρ
m+Vϕ
ρ
l−
Vcρ
fwhere ρ
f is the density of the weighing fluid; anddetermine a volume of the sample, Vc, using the formula
Vc=(ms−
mf−
Vsurρ
l)/ρ
f. - View Dependent Claims (15, 16, 17)
-
Specification