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Method for predicting water flooding sweep efficiency of low-viscosity crude oil reservoir

A prediction method, a low-viscosity technology, applied in prediction, data processing applications, instruments, etc., can solve problems such as the inability to describe the bending characteristics of the front and rear sections of the curve, the limitation of the scope of use, and the inapplicability of the phase permeability expression.

Active Publication Date: 2020-07-10
CHINA NATIONAL OFFSHORE OIL (CHINA) CO LTD +1
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Problems solved by technology

The oil-water relative permeability ratio in conventional water drive sweep coefficient prediction models is commonly ro / K rw -S w Semi-logarithmic linear relational expression, while the oil-water relative permeability ratio curve tested by rock experiments presents the characteristics of a straight line in the middle section and curved front and back sections on the semi-logarithmic coordinates, that is, it cannot describe the curved characteristics of the front and back sections of the curve
That is, the relative permeability expression applied by the conventional water flooding sweep coefficient prediction model is not applicable to the ultra-high water-cut stage, while the relative permeability expression applicable to the ultra-high water-cut stage is only applicable when the water cut in the oil well or oil field reaches the ultra-high water-cut stage. scope of use

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  • Method for predicting water flooding sweep efficiency of low-viscosity crude oil reservoir
  • Method for predicting water flooding sweep efficiency of low-viscosity crude oil reservoir
  • Method for predicting water flooding sweep efficiency of low-viscosity crude oil reservoir

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Embodiment Construction

[0028] The experimental methods used in the following examples are conventional methods unless otherwise specified.

[0029] The materials and reagents used in the following examples can be obtained from commercial sources unless otherwise specified.

[0030] Follow the steps below to predict the waterflood sweep coefficient for low viscosity crude oil reservoirs:

[0031] 1) Judging whether the viscosity of crude oil is low under reservoir conditions: the criterion is the Petroleum and Natural Gas Industry Standard of the People's Republic of China "SY / T6169-1995 Reservoir Classification", that is, the viscosity of crude oil is less than 5mPa·s.

[0032] 2) Judging whether the reservoir is developed by water flooding: the reservoir is required to be developed by water flooding or the water body multiple of edge and bottom water is greater than 40 times, and the formation pressure of the reservoir is always greater than the saturation pressure of crude oil during the developme...

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Abstract

The invention discloses a method for predicting a water flooding sweep efficiency of a low-viscosity crude oil reservoir. The method comprises the following steps: selecting a water flooding developedlow-viscosity crude oil reservoir as a target oil field, and making a linear relation curve between the target oil field and the water flooding developed low-viscosity crude oil reservoir within therange of 0.02-1.00 according to oil-water relative permeability of the target oil field, so as to obtain a starting point and an end point of the linear relation curve; delineating the water floodingcontrol geological reserves of a target oil field or a single well of the target oil field by integrating the production dynamics, and then determining the water flooding movable oil reserves; fittingactual production dynamic data of the target oil field by utilizing the water flooding sweep efficiency calculation model shown in the formula (1) to obtain values of constants A and B in the formula(1); and obtaining the water flooding sweep efficiency of the target oil field at different water-oil ratios by utilizing the water flooding sweep efficiency calculation model shown in the formula (1). According to the method, the problems that uncertainty is brought to reservoir numerical simulation prediction due to unclear reservoir understanding, and a numerical simulation method is complex in process, high in cost, long in period and the like are solved.

Description

technical field [0001] The invention relates to a method for predicting the water flooding sweep coefficient of a low-viscosity crude oil reservoir, which belongs to the field of petroleum development. Background technique [0002] Usually, the water flooding sweep coefficient prediction model is used to predict the water flooding sweep coefficient of a single well or reservoir at different development stages after fitting the actual production performance data. The oil-water relative permeability ratio in conventional water drive sweep coefficient prediction models is commonly ro / K rw -S w The semi-logarithmic linear relational expression is used to describe the oil-water relative permeability ratio curve in the rock experiment, and the semi-logarithmic coordinates show the characteristics of a straight line in the middle section and a curved front and back section, that is, it cannot describe the curved characteristics of the front and back sections of the curve. That ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/04G06Q50/02
CPCG06Q10/04G06Q50/02Y02A10/40
Inventor 苑志旺杨宝泉杨莉张迎春李晨曦顾文欢陈筱段瑞凯张昕康博涛郜益华杨希濮陈国宁张旭
Owner CHINA NATIONAL OFFSHORE OIL (CHINA) CO LTD
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