CN111401595B - Low-viscosity crude oil reservoir water flooding wave and coefficient prediction method - Google Patents

Low-viscosity crude oil reservoir water flooding wave and coefficient prediction method Download PDF

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CN111401595B
CN111401595B CN201910003928.8A CN201910003928A CN111401595B CN 111401595 B CN111401595 B CN 111401595B CN 201910003928 A CN201910003928 A CN 201910003928A CN 111401595 B CN111401595 B CN 111401595B
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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
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Abstract

The invention discloses a method for predicting water flooding wave and coefficient of a low-viscosity crude oil reservoir. The method comprises the following steps: selecting a low-viscosity crude oil reservoir developed by water flooding as a target oil field, and manufacturing the oil reservoir with the water content of 0.02-1.00 according to the oil-water phase permeability of the target oil field
Figure DDA0001934699400000011
And

Description

Low-viscosity crude oil reservoir water flooding wave and coefficient prediction method
Technical Field
The invention relates to a method for predicting water flooding wave and coefficient of a low-viscosity crude oil reservoir, belonging to the field of petroleum development.
Background
Usually, a water flooding wave and coefficient prediction model is applied to predict the water flooding wave and coefficient of a single well or an oil reservoir in different development stages after actual production dynamic data is fitted. Common K is used for oil-water relative permeability ratio in conventional water flooding sweep coefficient prediction model ro /K rw -S w The semilog linear relation is characterized, and the rock experiment test oil-water relative permeability ratio curve is presented on semilog coordinatesThe middle section is characterized by straight line, front section and back section bending, namely the curve front section and back section bending characteristics cannot be described. Namely, the phase permeability expression applied by the conventional water flooding wave and coefficient prediction model is not suitable for the ultra-high water cut stage, but the phase permeability expression suitable for the ultra-high water cut stage is only suitable for the stage when the water content of the oil well or the oil field reaches the ultra-high water cut stage, so that the application range of the phase permeability expression is limited.
Generally, low-viscosity crude oil has good quality and high value, is a high-quality part in petroleum resources, and is also a focus of exploration and development. Therefore, a novel oil-water relative permeability ratio characterization relational expression with a wide application range needs to be provided for low-viscosity crude oil, and a water flooding wave and coefficient prediction method widely applicable to low-viscosity crude oil reservoirs is established to guide reservoir production system optimization and adjust well deployment.
Disclosure of Invention
The invention aims to provide a water flooding wave and coefficient prediction method for a low-viscosity crude oil reservoir, which is suitable for the oil reservoir which has low crude oil viscosity and is developed by water flooding under the oil reservoir condition.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a method for predicting the water flooding wave and coefficient of a low-viscosity crude oil reservoir, which comprises the following steps of:
(1) Selecting a low-viscosity crude oil reservoir developed by water flooding as a target oil field, and manufacturing the low-viscosity crude oil reservoir with the water content of 0.02-1.00 according to the oil-water phase permeability of the target oil field
Figure BDA0001934699380000011
And/or>
Figure BDA0001934699380000012
The water contents corresponding to the initial point and the end point of the linear relation curve are the applicable range of the prediction method;
wherein:
Figure BDA0001934699380000013
upper typeIn, K rw Representing the relative permeability of the oil phase; k ro Represents the relative permeability of the aqueous phase; s wd Represents normalized water saturation,%; s w Represents the reservoir water saturation,%; s wc Represents reservoir irreducible water saturation,%; s or Denotes the residual oil saturation,%;
(2) Comprehensively producing dynamic state, delineating the water-drive control geological reserves of the target oil field or a single well of the target oil field, and further determining the water-drive movable oil reserves;
(3) Fitting actual production dynamic data of the target oil field by using a water flooding wave and coefficient calculation model shown in formula (1) to obtain values of constants A and B in formula (1);
Figure BDA0001934699380000021
in the formula (1), the reaction mixture is,
Figure BDA0001934699380000022
N om represents the water-drive mobile oil reserve, N p Representing cumulative oil production, WOR representing water-oil ratio;
(4) Obtaining the water drive wave sum coefficient of the target oil field at different water-oil ratios by using the water drive wave sum coefficient calculation model shown in the formula (1), namely E in the formula (1) v 。
In the prediction method, the low-viscosity crude oil reservoir refers to a crude oil reservoir with crude oil viscosity of less than 5mPa & s, and is based on the standard of SY/T6169-1995 oil reservoir classification in the oil and gas industry standard of the people's republic of China.
In the prediction method, the low-viscosity crude oil reservoir developed by water flooding refers to an oil reservoir developed by water flooding or an oil reservoir with the edge bottom water body multiple more than 40 times, and the formation pressure is always kept to be higher than the saturation pressure of crude oil in the development process, namely, whether the oil reservoir is the basis of water flooding development is judged.
In the prediction method, in the step (2), the water flooding control geological reserves of the target oil field or the single well of the target oil field developed by water flooding are determined according to the following method:
selecting a water drive control range principle: taking the distance between each oil well and the corresponding water injection well; half the distance between the two oil wells which are adjacent to and communicated with the oil well and less than or equal to one well spacing; the well is controlled to be within half of its well spacing without a well beyond its well spacing.
In the prediction method, in the step (2), the water-drive control geological reserves of the target oil field or the single well of the target oil field developed by the bottom water energy are determined according to the following method:
and determining the water drive control geological reserves according to the single well control radius determined by the oil well interference test, the well test explanation or the actual production dynamic.
In the prediction method, in the step (2), the water-drive movable oil storage amount is determined according to the formula (2);
N om ＝N o E D (2)
in the formula (2), E D Represents the oil displacement efficiency, N o Representing water drive control geological reserves;
the oil displacement efficiency is obtained by the formula (3):
Figure BDA0001934699380000023
in the formula (3), S oi Representing the original oil saturation of the reservoir, S wc Indicating reservoir irreducible water saturation, S or Representing reservoir water flooding residual oil saturation.
Because the phase permeability expression applied by the conventional water flooding wave and coefficient prediction model is not suitable for the ultrahigh water content stage, the phase permeability expression suitable for the ultrahigh water content stage is only suitable for the ultrahigh water content stage of an oil well or an oil field, and the application range of the phase permeability expression is limited. Generally, low-viscosity crude oil has good quality and high value, is a high-quality part in petroleum resources, and is also a focus of exploration and development. Therefore, a novel oil-water relative permeability ratio characterization relational expression with a wide application range needs to be provided for low-viscosity crude oil, and a water flooding wave and coefficient prediction method widely applicable to low-viscosity crude oil reservoirs is established to guide reservoir production system optimization and adjust well deployment. The invention establishes a water flooding wave and coefficient prediction method with wide application range for the low-viscosity crude oil water flooding reservoir, and fills the blank in the aspect of water flooding wave and coefficient prediction of the low-viscosity crude oil reservoir in the technical field of reservoir engineering. The method avoids the problems of uncertainty brought to numerical simulation prediction of the oil reservoir due to unclear reservoir knowledge, complex process, high cost, long period and the like of a numerical simulation method. The method is simple, convenient and quick, can update the real-time adjustment fitting coefficient according to actual production data, and has high prediction precision.
Drawings
FIG. 1 shows fitting of M reservoir actual data by a water flooding wave and coefficient calculation model.
Detailed Description
The experimental procedures used in the following examples are all conventional procedures unless otherwise specified.
Materials, reagents and the like used in the following examples are commercially available unless otherwise specified.
Predicting the water flooding wave sum coefficient of the low-viscosity crude oil reservoir according to the following steps:
1) Judging whether the viscosity of the crude oil is low under the oil reservoir condition: the criterion is oil deposit classification of oil and gas industry standard SY/T6169-1995 of the people's republic of China, namely the viscosity of the crude oil is less than 5 mPa.s.
2) Judging whether the oil reservoir is developed by water drive: the oil reservoir is required to be developed by water injection or the multiple of the edge bottom water body is more than 40 times, and the formation pressure of the oil reservoir is always kept to be more than the saturation pressure of crude oil in the development process.
3) According to the oil-water phase permeability of the target oil field, the water content is in the range of 0.02-1.00
Figure BDA0001934699380000031
And
Figure BDA0001934699380000032
the water content corresponding to the initial point and the end point of the linear relation curve is the application range of the water flooding wave and coefficient calculation method, wherein: />
Figure BDA0001934699380000033
4) Comprehensive production dynamic knowledge is used for delineating water drive control geological reserves of an oil field or a single well so as to determine movable oil reserves, and the method comprises the following specific steps:
a. delineating water drive control geological reserves N o
If water injection development is adopted, the distance between an oil well and a corresponding water injection well is taken; half of the distance between the two oil wells which are adjacent to and communicated with the oil well and are less than or equal to one well spacing; the well is controlled to be within half of its well spacing without a well beyond its well spacing.
And if the oil reservoir is developed by depending on the energy of the bottom water, the water drive control geological reserve is defined according to the production dynamics or the single well control radius determined by the well test explanation.
b. Determining water drive mobile oil reserve N om
Controlling geological reserves N according to a stable water drive o And oil displacement efficiency E D Determining the reserve N of water-driven movable oil om Wherein:
Figure BDA0001934699380000041
N om ＝N o E D 。
wherein S is oi Representing the original oil saturation of the reservoir, S wc Indicating reservoir irreducible water saturation, S or Representing reservoir water flooding residual oil saturation
5) And determining water flooding wave sum coefficients by utilizing fitting to calculate model coefficients.
Application of water drive sweep sum coefficient calculation model
Figure BDA0001934699380000042
And fitting the actual production dynamic data of the oil field to obtain a value of constant coefficient A, B. Wherein +>
Figure BDA0001934699380000043
N om Means said water-driven mobile oilReserve, N p Represents the cumulative oil production, WOR represents the water-oil ratio, f; a and B are constant coefficients.
6) And calculating water flooding wave sum coefficients under different WOR conditions.
Application of water drive wave sum coefficient calculation model
Figure BDA0001934699380000044
Calculating water drive sweep and coefficient E according to different WOR values of oil well V 。
Water drive sweep sum coefficient calculation is carried out by taking M oil reservoirs as an example
1) The crude oil viscosity of the M oil reservoir crude oil is 0.09mPa & s under the oil reservoir condition, and the M oil reservoir crude oil belongs to low-viscosity crude oil according to the SY/T6169-1995 oil reservoir classification of the oil and gas industry standard of the people's republic of China, and meets the application condition of the method.
2) And calculating the water body multiple of the M oil reservoir to be 8, adopting water injection pressure-maintaining development to keep the formation pressure to be greater than the crude oil saturation pressure all the time in the oil reservoir development process, and meeting the application conditions of the method.
3) According to the oil-water phase permeability of M oil reservoir, the water content is in the range of 0.02-1.00
Figure BDA0001934699380000045
And
Figure BDA0001934699380000046
the water content corresponding to the initial point and the end point of the linear relation curve is 0.18-99.76% respectively, namely the water drive control geological reserves of the water drive wave sum coefficient meter oil reservoir, thereby determining the movable oil reserves, and the specific steps are as follows:
a. delineating M reservoir water drive control geological reserve N o
M oil reservoir is developed by water injection and water drive is adopted to control geological reserve N o The principle of delineation: taking the distance between the oil well and the corresponding water injection well; half of the distance between the two oil wells which are adjacent to and communicated with the oil well and are less than or equal to one well spacing; the well being spaced from more than one well without a wellIs the control range. Determining M reservoir water drive control geological reserve N o Is 1133 × 10 4 m 3 。
b. Determining water drive mobile oil reserve N om
Calculating the oil displacement efficiency E according to the oil reservoir experiment testing phase permeability D =0.75, determine water-drive mobile oil reserve N om Is =850 × 10 4 m 3 。
5) And determining water flooding wave sum coefficients by utilizing fitting to calculate model coefficients.
Application of water drive wave sum coefficient calculation model
Figure BDA0001934699380000051
And fitting the actual production dynamic data of the M oil reservoir to obtain the values of constant coefficients A and B which are respectively-1.59 and 4.56, as shown in the figure 1.
6) And calculating the water flooding sweep and coefficient of the M oil reservoir under different WOR conditions.
Application of water drive wave sum coefficient calculation model
Figure BDA0001934699380000052
Calculating water drive sweep and coefficient E according to different WOR values of oil well V . When the limiting water content WOR =49, the water flooding spread coefficient is 76.8%. />

Claims (5)

1. A low-viscosity crude oil reservoir water flooding wave and coefficient prediction method comprises the following steps:
(1) Selecting a low-viscosity crude oil reservoir developed by water flooding as a target oil field, and manufacturing the low-viscosity crude oil reservoir with the water content of 0.02-1.00 according to the oil-water phase permeability of the target oil field
Figure FDA0004069022000000011
And/or>
Figure FDA0004069022000000012
Obtaining the initial point and the terminal point of the linear relation curve;
wherein:
Figure FDA0004069022000000013
in the above formula, K rw Representing the relative permeability of the oil phase; k ro Represents the relative permeability of the aqueous phase; s wd Represents normalized water saturation,%; s w Represents the reservoir water saturation,%; s. the wc Represents reservoir irreducible water saturation,%; s or Represents the residual oil saturation,%;
(2) Comprehensively producing dynamic, determining the water-drive control geological reserves of the target oil field or a single well of the target oil field, and further determining the water-drive movable oil reserves;
determining the water-drive movable oil reserve according to the formula (2);
N om ＝N o E D (2)
in formula (2), E D Represents the oil displacement efficiency, N o Representing water drive control geological reserves;
the oil displacement efficiency is obtained by the formula (3):
Figure FDA0004069022000000014
in formula (3), S oi Representing the original oil saturation of the reservoir, S wc Indicating reservoir irreducible water saturation, S or Representing the saturation of residual oil of reservoir water flooding;
(3) Fitting actual production dynamic data of the target oil field by using a water flooding wave sum coefficient calculation model shown in formula (1) to obtain values of constants A and B in formula (1);
Figure FDA0004069022000000015
in the formula (1), the reaction mixture is,
Figure FDA0004069022000000016
N om represents the water-drive mobile oil reserve, N p WOR chart showing cumulative oil productionIndicating the water-oil ratio;
(4) Obtaining the water drive wave spread coefficient of the target oil field at different water-oil ratios by using the water drive wave spread coefficient calculation model shown in the formula (1), namely E in the formula (1) v 。
2. The prediction method according to claim 1, characterized in that: the low-viscosity crude oil reservoir refers to a crude oil reservoir with crude oil viscosity of less than 5mPa & s.
3. The prediction method according to claim 1 or 2, characterized in that: the low-viscosity crude oil reservoir developed by water flooding refers to an oil reservoir developed by water flooding or an oil reservoir with the multiple of edge-bottom water body being more than 40 times and the formation pressure being more than the saturation pressure of crude oil being kept all the time in the development process.
4. The prediction method according to claim 3, characterized in that: in the step (2), determining the water-flooding control geological reserves of the target oil field or the single well of the target oil field developed by water flooding according to the following method:
taking the distance between each oil well and the corresponding water injection well; half the distance between the two oil wells which are adjacent to and communicated with the oil well and less than or equal to one well spacing; the oil well takes half of the well spacing as the control range without well beyond the well spacing.
5. The prediction method according to claim 4, wherein: in the step (2), determining the water-drive control geological reserves of the target oil field or the single well of the target oil field developed by means of the bottom water energy according to the following method:
and determining the water drive control geological reserves according to the single well control radius determined by the oil well interference test, the well test explanation or the actual production dynamic.
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