Method for the calculation of fluid interface level
View Patent ↗A method calculates the boundary layer level between fluids, in particular the boundary layer level between oil and water in connection with the use of a segment-based boundary layer meter. The calculations are based on the use of measurement signals from a number of segments, n, and the boundary layer level, L, of the water is calculated as follows: L = ρ _ - ρ 0 ρ v - ρ 0 ( L u - L l ) + L l where: L u Upper water range area L l Lower water range area ρ n Density of segment no. n from the profile meter {circumflex over (ρ)} n Corrected density for segment no. n ρ Calculated mean density ρ v Mean density of water from the profile meter ρ o Mean density of oil from the profile meter N Total number of segments included.
1. A method of calculating a boundary layer level between oil and water in a fluid, said method comprising:
obtaining measurement signals using a segment-based profile meter, the measurement signals representing densities measured from a number of segments, n, of the fluid;
determining a corrected density for each segment based on the measurement signals using the profile meter and the formula:
{circumflex over (ρ)} n =max(min(ρ n ;ρ v );ρ o )
wherein:
ρ n is a density of segment number n obtained by the profile meter,
ρ v is a mean density of water obtained by the profile meter,
ρ o is a mean density of oil obtained by the profile meter, and
{circumflex over (ρ)} n is a corrected density for segment number n;
calculating a mean density of the fluid using the profile meter and the formula:
ρ
_
=
1
N
∑
n
=
1
N
ρ
^
n
wherein:
N is a total number of segments measured by the profile meter, and
ρ is a calculated mean density of the fluid; and
calculating a boundary layer level of the fluid using the profile meter and the formula:
L
=
ρ
_
-
ρ
0
ρ
v
-
ρ
0
(
L
u
-
L
l
)
+
L
l
wherein:
L u is an area of an upper water range of a segment,
L l is an area of a lower water range of a segment, and
L is a boundary layer level of the fluid.