US 2026/0210936 A1 · Method for Determining Water Cut and Oil - Gas Ratio in a Three

Abstract

The present application provides a method for determining water cut and oil-gas ratio in a three-phase system. The method comprises: acquiring the total mass, total volume, and gas volume of produced fluids at the wellhead of a target well within a preset monitoring period, wherein the produced fluids are in an oil-water-gas three-phase mixed state; obtaining the emulsion ratio, emulsion volume coefficient, oil density, water density, and gas density of the fluids; determining liquid-phase mass and liquid-phase volume of the fluids according to the total mass, total volume, gas volume, and gas density; calculating the oil mass fraction in the liquid phase of the fluids based on the liquid-phase mass, liquid-phase volume, emulsion ratio, emulsion volume coefficient, oil density, and water density; and determining water cut and oil-gas ratio according to the oil mass fraction in the liquid phase. This solution addresses the problem of low accuracy in conventional calculations of water cut and oil-gas ratio, thereby achieving efficient and accurate determination.

Claims9

Dependent claims

1-10. (canceled)

A method for determining water cut and gas-oil ratio of a three-phase system, characterized in that the method comprises:

collecting, within a preset monitoring period, a total mass, a total volume, and a gas volume of a fluid produced at a wellhead of a target oil well, wherein the produced fluid is in an oil-water-gas three-phase mixed state;
obtaining an emulsification ratio, an emulsion volume coefficient, an oil density, a water density, and a gas density of the fluid;
determining a liquid-phase mass and a liquid-phase volume of the fluid according to the total mass, the total volume, the gas volume, and the gas density of the fluid;
calculating an oil mass fraction within the liquid phase of the fluid according to the liquid-phase mass, the liquid-phase volume, the emulsification ratio, the emulsion volume coefficient, the oil density, and the water density of the fluid;
determining a water cut and a gas-oil ratio of the fluid according to the oil mass fraction within the liquid phase of the fluid;
wherein calculating the oil mass fraction within the liquid phase of the fluid according to the liquid-phase mass, the liquid-phase volume, the emulsification ratio, the emulsion volume coefficient, the oil density, and the water density comprises:
calculating the oil mass fraction within the liquid phase of the fluid according to the following formula:
V
l
=
(
1
-
r
)
⁢
(
1
-
α
)
⁢
M
l
ρ
w
+
δ
[
α
⁢
M
l
ρ
o
+
r
⁢
(
1
-
α
)
⁢
M
l
ρ
w
]
alternatively, calculating the oil mass fraction within the liquid phase of the fluid according to the following formula:
V
l
=
(
1
-
r
)
⁢
(
1
-
α
)
⁢
M
l
ρ
w
+
(
1
-
s
)
⁢
α
⁢
M
l
ρ
o
⁢
δ
[
s
⁢
α
⁢
M
l
ρ
o
+
r
⁢
(
1
-
α
)
⁢
M
l
ρ
w
]
wherein α represents the oil mass fraction, r represents the emulsion ratio, δ represents the emulsion volume coefficient, Ml represents the liquid-phase mass, ρw represents the water density, ρo represents the oil density, Vl represents the liquid-phase volume, and s represents the proportion of the oil phase that can be emulsified.

105 more elements

Dependencies are inferred from the claim text.

Method for Determining Water Cut and Oil - Gas Ratio in a Three - Phase System

Life of this patent

Method for Determining Water Cut and Oil - Gas Ratio in a Three - Phase System

Life of this patent

Abstract

Claims9