Configuration information calculation method, device and equipment for balancing steam drive

Abstract

The invention relates to the technical field of oil reservoir development, in particular to a configuration information calculation method, device and equipment for balanced steam flooding, and the method comprises the steps that according to the temperatures of multiple oil layers of a target oil reservoir, water phase split rate curves of the multiple oil layers are determined; dividing the plurality of oil layers of the target oil reservoir into a plurality of first oil layers and a plurality of second oil layers according to the average water saturation of the plurality of oil layers of the target oil reservoir; calculating first water saturation of outlet ends of the plurality of first oil layers and oil-water front edge positions of the plurality of second oil layers according to the water phase diversion rate curves of the plurality of oil layers; the first water saturation is the current water saturation; and according to the first water saturation of the outlet ends of the multiple first oil layers and the oil-water front edge positions of the multiple second oil layers, configuration information of the multiple oil layers of the target oil reservoir during equilibrium displacement is calculated. According to the embodiment of the invention, the configuration information of the oil reservoir during equilibrium displacement is more accurately calculated according to the temperature of the oil reservoir, so that the balanced utilization of the heavy oil reserve of each oil reservoir is realized.

Description

Technical Field

[0001] The embodiments of this specification relate to the technical field of oil reservoir development, and specifically to a method, device and equipment for calculating configuration information of balanced steam drive. Background Art

[0002] Multilayer heavy oil reservoirs are an important component of heavy oil reservoirs, with many oil-bearing strata, large differences in physical properties of each oil layer vertically, and complex oil-water relationships. Heavy oil has the characteristics of strong viscosity-temperature sensitivity, so steam injection thermal recovery is widely used in the development of heavy oil reservoirs, including steam stimulation, steam flooding, steam-assisted gravity drainage, and fire burning of oil layers.

[0003] Considering that steam injection belongs to the exhaustion development mode, it faces problems such as low formation pressure and low oil-gas ratio in the later stage of injection. Therefore, steam drive is usually an important replacement mode in the later stage of injection development of heavy oil reservoirs. At present, the steam injection exploitation of heavy oil reservoirs generally adopts a general injection method. Steam mainly enters the high permeability layer and displaces the crude oil therein. Due to the large difference in viscosity between steam and heavy oil, the high permeability layer that absorbs more steam has lower seepage resistance; in addition, affected by the vertical heterogeneity of the reservoir, the difference in steam absorption between layers is large. The flushing effect of steam further strengthens the inherent heterogeneity of the reservoir, which leads to uneven vertical utilization during the development process and poor development effect. In order to achieve balanced utilization of each oil layer, reduce the amount of steam entering the high permeability layer, allow more steam to enter the low permeability layer, and utilize a large amount of unused heavy oil reserves, the existing stratified steam injection method calculates the injection amount of different oil layers to reduce the inefficient and ineffective use of injected steam and improve the recovery degree and oil-gas ratio of multi-layer heavy oil reservoirs.

[0004] However, the accuracy of the steam injection amount calculated by the interlayer injection amount calculation method used in the existing stratified steam injection method is low, and it is still unsatisfactory in achieving balanced development of each oil layer, reducing the amount of steam entering the high permeability layer, increasing the amount of steam entering the low permeability layer, and utilizing a large amount of unused heavy oil reserves. Therefore, how to overcome the problem of the inability to achieve balanced development of each oil layer in the existing stratified steam injection method, and propose a balanced displacement injection design method for steam flooding in multi-layer heavy oil reservoirs, so as to reduce the amount of steam entering the high permeability layer, increase the amount of steam entering the low permeability layer, and then utilize a large amount of unused heavy oil reserves is a key problem to be solved urgently. Summary of the invention

[0005] The purpose of the embodiments of this specification is to provide a configuration information calculation method, device and equipment for balanced steam drive to overcome the problem that the existing stratified steam injection method cannot achieve balanced utilization of each oil layer, so as to reduce the amount of steam entering the high permeability layer and increase the amount of steam entering the low permeability layer, thereby utilizing a large amount of unused heavy oil reserves.

[0006] On the one hand, an embodiment of the present specification provides a method for calculating configuration information of balanced steam drive, the method for calculating configuration information of balanced steam drive comprising: determining water phase split rate curves of multiple oil layers according to the temperatures of multiple oil layers in a target oil reservoir; dividing the multiple oil layers in the target oil reservoir into multiple first oil layers and multiple second oil layers according to the average water saturation of the multiple oil layers in the target oil reservoir; the first oil layer is a visible gasoline layer; the second oil layer is an unseen gasoline layer; calculating the first water saturation at the outlet ends of the multiple first oil layers and the oil-water front positions of the multiple second oil layers according to the water phase split rate curves of the multiple oil layers; the first water saturation is the current water saturation; calculating the configuration information of the multiple oil layers in the target oil reservoir during balanced displacement according to the first water saturation at the outlet ends of the multiple first oil layers and the oil-water front positions of the multiple second oil layers.

[0007] On the other hand, an embodiment of the present specification provides a configuration information calculation device for balanced steam drive, the device comprising: a determination module, used to determine the water phase diversion rate curves of the multiple oil layers according to the temperatures of the multiple oil layers in the target oil reservoir; a division module, used to divide the multiple oil layers of the target oil reservoir into multiple first oil layers and multiple second oil layers according to the average water saturation of the multiple oil layers in the target oil reservoir; the first oil layer is a gasoline layer that has been seen; the second oil layer is a gasoline layer that has not been seen; a calculation module, used to calculate the first water saturation at the outlet ends of the multiple first oil layers and the oil-water front positions of the multiple second oil layers according to the water phase diversion rate curves of the multiple oil layers; the first water saturation is the current water saturation; the calculation module is used to calculate the configuration information of the multiple oil layers in the target oil reservoir during balanced displacement according to the first water saturation at the outlet ends of the multiple first oil layers and the oil-water front positions of the multiple second oil layers.

[0008] On the other hand, an embodiment of the present specification provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the above-mentioned method for calculating configuration information of balanced steam drive.

[0009] It can be seen from the technical solutions provided in the above embodiments of this specification that the configuration information calculation method for balanced steam drive provided in the embodiments of this specification can determine the water phase split rate curves of multiple oil layers according to the temperatures of multiple oil layers in the target oil reservoir; divide the multiple oil layers of the target oil reservoir into multiple first oil layers and multiple second oil layers according to the average water saturation of the multiple oil layers in the target oil reservoir; the first oil layer is a gasoline layer that has been seen; the second oil layer is a gasoline layer that has not been seen; calculate the first water saturation of the outlet ends of the multiple first oil layers and the oil-water front positions of the multiple second oil layers according to the water phase split rate curves of the multiple oil layers; the first water saturation is the current water saturation; calculate the configuration information of the multiple oil layers in the target oil reservoir during balanced displacement according to the first water saturation at the outlet ends of the multiple first oil layers and the oil-water front positions of the multiple second oil layers. Compared with the existing methods, the configuration information of each oil layer during balanced displacement can be calculated more accurately according to the temperature of each oil layer. According to the configuration information of each oil layer during displacement, the amount of steam entering the high permeability layer can be reduced and the amount of steam entering the low permeability layer can be increased, thereby achieving balanced utilization of heavy oil reserves in each oil layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the technical solutions in the embodiments of this specification or the prior art, the drawings required for use in the embodiments or the prior art description are briefly introduced below.

[0011] Figure 1 is a flow chart of a method for calculating configuration information of a balanced steam drive provided in an embodiment of this specification;

[0012] Figure 2 It is a schematic diagram of the overall flow of a method for calculating configuration information of a balanced steam drive provided in an embodiment of this specification;

[0013] Figure 3 It is a schematic diagram of the overall calculation process of a method for calculating configuration information of a balanced steam drive provided in an embodiment of this specification;

[0014] Figure 4 It is a schematic diagram of the oil phase relative permeability curve and the water phase relative permeability curve at 100° C. of the A reservoir provided in the examples of this specification;

[0015] Figure 5 It is a schematic diagram of the viscosity-temperature relationship curve of crude oil in reservoir A provided in the embodiments of this specification;

[0016] Figure 6 It is a schematic diagram of the longitudinal section of the A reservoir provided in the embodiment of this specification;

[0017] Figure 7 It is a schematic diagram of the relationship curve between the diversion rate and the average water saturation of each oil layer in the A oil reservoir provided in the embodiment of this specification;

[0018] Figure 8 It is a schematic diagram of the structure of a configuration information calculation device for balanced steam drive provided in an embodiment of this specification;

[0019] Fig. 9 It is a schematic diagram of the structural composition of a computer device provided in an embodiment of this specification. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of this specification to clearly and completely describe the technical solutions in the embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this specification, not all of the embodiments. Based on the embodiments in this specification, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this specification.

[0021] In some embodiments, before calculating the configuration information of the balanced steam flooding, reservoir parameters of the target reservoir, development status parameters before stratified heat injection, and injection parameters may be collected in advance.

[0022] The reservoir parameters of the target reservoir may include the thickness of multiple oil layers in the target reservoir, porosity, oil phase relative permeability curve, water phase relative permeability curve, bound water saturation at different temperatures, and crude oil viscosity-temperature relationship. The thickness of the oil layer is one of the important factors affecting the effect of reservoir development. Thicker oil layers usually mean larger oil storage space and possible higher production. The greater the effective thickness of the oil layer, the more obvious the reservoir development effect. Porosity refers to the ratio of the pore volume in the rock to the total volume of the rock, and is an important parameter reflecting the ability of the rock to store fluid. The greater the porosity, the larger the storage space of the rock and the stronger the oil storage capacity. At the same time, there is a certain relationship between porosity and permeability. Generally, the formation with good permeability also has good porosity; the greater the effective porosity, the higher the permeability. Permeability is a parameter that reflects the ability of fluid to pass through the pores of the rock. The higher the permeability, the smaller the flow resistance of the fluid in the rock, and the better the development effect. Permeability is affected by many factors, including the pore structure of the rock, the size of the particles, the arrangement mode, and the properties of the fluid. Irreducible water saturation refers to the volume fraction of water phase in rock pores that cannot be displaced by oil. The higher the irreducible water saturation, the higher the water content in the rock pores, which is more unfavorable to the storage and production capacity of the reservoir. Irreducible water saturation is affected by many factors, including the mineral composition of the rock, pore structure, fluid properties, temperature, pressure and other conditions. Irreducible water saturation will also change at different temperatures. Crude oil viscosity refers to the resistance to crude oil flow and is an important parameter reflecting the fluidity of crude oil. Crude oil viscosity is greatly affected by temperature. As the temperature increases, the activity energy of crude oil molecules increases, the surface tension decreases, and the polarity changes, resulting in a decrease in crude oil viscosity. Changes in crude oil viscosity will affect the flow ability and production efficiency of the fluid, and have an important impact on the development effect of the reservoir.

[0023] The development status parameters of the target reservoir before stratified heat injection can include the average temperature and average water saturation of multiple oil layers in the target reservoir. The average temperature of the oil layer is one of the important factors affecting the development effect of heavy oil reservoirs. During the heat injection production process, the change in temperature will directly affect the viscosity of crude oil, and then affect the fluidity and production efficiency of crude oil. Higher temperature can reduce the viscosity of crude oil, making it easier to flow and produce. Water saturation refers to the volume fraction of water phase in the pores of rocks. In reservoir development, the level of water saturation directly reflects the ratio of water phase to phase oil in the reservoir. The average water saturation refers to the average value of water saturation of the oil layer. A higher water saturation means that the water phase content in the reservoir is higher, which may have an adverse effect on the storage and production capacity of the reservoir. In addition, water saturation is also affected by many factors, including rock pore structure, fluid properties, temperature, pressure and other conditions. During the stratified heat injection process, water saturation may change with the increase of temperature and the injection of steam.

[0024] The injection parameters of the target reservoir may include the configuration information and control time of multiple oil layers in the target reservoir. The configuration information may be the flow rate of steam injected into the oil layer per unit time. The flow rate of steam injected into the oil layer per unit time directly affects the distribution of steam in the oil layer and the viscosity reduction effect, thereby affecting the crude oil recovery efficiency. The selection of the flow rate of steam injected into the oil layer per unit time needs to consider many factors, including the permeability, thickness, viscosity of crude oil and formation pressure of the oil layer. Higher permeability allows more steam to be injected into the oil layer per unit time, while higher crude oil viscosity and lower formation pressure may require reducing the flow rate of steam injected into the oil layer per unit time. Control time refers to the duration of the stratified steam injection process.

[0025] Figure 1 A flow chart of a method for calculating configuration information of a balanced steam drive provided in an embodiment of this specification. Figure 2 The overall flow diagram of a method for calculating configuration information of a balanced steam drive provided in an embodiment of this specification is as follows: Figure 3 This is a schematic diagram of the overall calculation process of a method for calculating configuration information of a balanced steam drive provided in an embodiment of this specification. In specific implementation, the method includes the following steps:

[0026] S101: Determine water phase split rate curves of the multiple oil layers according to the temperatures of the multiple oil layers in the target oil reservoir.

[0027] In some embodiments, the average water saturation of multiple oil layers in the target oil reservoir can be obtained; the relative permeability of the multiple oil layers in the target oil reservoir can be determined according to the temperature and the average water saturation of the multiple oil layers in the target oil reservoir; the relative permeability of the multiple oil layers in the target oil reservoir includes the water phase relative permeability of the multiple oil layers and the oil phase relative permeability of the multiple oil layers; the oil phase viscosity of the multiple oil layers in the target oil reservoir can be determined according to the temperature of the multiple oil layers in the target oil reservoir; according to the oil phase viscosity, water phase relative permeability and oil phase relative permeability of the multiple oil layers in the target oil reservoir, the formula Determine the water phase split rate curves of multiple oil layers. Where n represents the nth oil layer of the target reservoir; It represents the average water saturation of the nth oil layer in the target reservoir; It represents the water phase diversion rate corresponding to the average water saturation of the nth oil layer in the target reservoir; represents the water phase viscosity of the nth oil layer in the target reservoir, is a fixed value; It represents the oil phase viscosity of the nth oil layer in the target reservoir; It represents the relative permeability of water phase in the nth oil layer of the target reservoir; It represents the oil phase relative permeability of the nth oil layer in the target reservoir.

[0028] The oil phase viscosity of multiple oil layers is determined by the temperature of multiple oil layers in the target oil reservoir, and then the water phase diversion rate curves of multiple oil layers are determined according to the oil phase viscosity, water phase relative permeability and oil phase relative permeability of multiple oil layers. The effect of temperature on the oil phase viscosity of the oil layer is fully considered, laying a good data foundation for the calculation of the configuration information of each oil layer during subsequent balanced displacement.

[0029] The relationship curves of water phase relative permeability and average water saturation at different temperatures can be obtained, and the relationship curves of oil phase relative permeability and average water saturation at different temperatures can be obtained. According to the temperature and average water saturation of multiple oil layers in the target oil reservoir, the water phase relative permeability and oil phase relative permeability of multiple oil layers in the target oil reservoir can be determined. Specifically, for each oil layer in the target oil reservoir, the corresponding water phase relative permeability-water saturation relationship curve can be determined according to the average temperature of the oil layer, and the corresponding oil phase relative permeability-water saturation relationship curve can be determined. Substituting the average water saturation of the oil layer into the water phase relative permeability-water saturation relationship curve and the oil phase relative permeability-water saturation relationship curve, the water phase relative permeability and oil phase relative permeability of the oil layer can be obtained. Similarly, the relationship curve of crude oil viscosity-temperature of the target oil reservoir can be obtained. According to the average temperature of each oil layer in the target oil reservoir, the corresponding oil phase viscosity of each oil layer in the target oil reservoir can be determined based on the relationship curve of crude oil viscosity-temperature of the target oil reservoir. According to the oil phase viscosity, water phase relative permeability and oil phase relative permeability of each oil layer in the target reservoir, the relationship curve between water phase diversion rate and water saturation at different temperatures of each oil layer can be determined by the following formula:

[0030]

[0031] In the formula, n represents the nth oil layer of the target reservoir; represents the average water saturation of the nth oil layer in the target reservoir; T n represents the average temperature of the nth oil layer in the target reservoir; Indicates that the nth oil layer of the target reservoir has an average temperature of T n The average water saturation is The corresponding water phase split ratio; represents the water phase viscosity of the nth oil layer in the target reservoir, is a fixed value; Indicates that the average temperature is T n The oil phase viscosity of the nth oil layer of the target reservoir under the condition of; Indicates that the average temperature is T n and the average water saturation is The relative permeability of water phase in the nth oil layer of the target reservoir under the condition of ; Indicates that the average temperature is T nand the average water saturation is The oil phase relative permeability of the nth oil layer in the target reservoir under the condition of .

[0032] S102: Divide the multiple oil layers of the target oil reservoir into multiple first oil layers and multiple second oil layers according to the average water saturation of the multiple oil layers of the target oil reservoir; the first oil layers are visible gasoline layers; and the second oil layers are non-visible gasoline layers.

[0033] In some embodiments, according to the irreducible water saturation of the multiple oil layers, the water saturation of the oil-water front, and the water phase split rate curve, the formula Determine the average water saturation of the two-phase region of multiple oil layers. Where n represents the nth oil layer of the target reservoir; T n represents the average temperature of the nth oil layer in the target reservoir; It represents the water saturation of the oil-water front of the nth oil layer in the target reservoir; Indicates that the average temperature of the nth oil layer in the target reservoir is T n Irreducible water saturation at ; represents the water phase diversion rate derivative corresponding to the water saturation of the oil-water front of the nth oil layer in the target reservoir; It represents the average water saturation of the two-phase zone of the nth oil layer in the target reservoir.

[0034] By calculating the average water saturation of the two-phase zone of multiple oil layers, a data foundation is laid for dividing the seen gasoline layer and the unseen gasoline layer based on the average water saturation of the two-phase zone of multiple oil layers.

[0035] According to the calculated water saturation of the oil-water front of each oil layer, the corresponding water phase split rate and water phase split rate derivative can be determined based on the relationship curve of water phase split rate-water saturation of each oil layer. According to the water phase split rate derivative corresponding to the water saturation of the oil-water front of each oil layer and the irreducible water saturation of each oil layer, the average water saturation of the two-phase zone of multiple oil layers can be determined using the following formula:

[0036]

[0037] Where n represents the nth oil layer of the target reservoir; T n represents the average temperature of the nth oil layer in the target reservoir; It represents the water saturation of the oil-water front of the nth oil layer in the target reservoir; Indicates that the average temperature of the nth oil layer in the target reservoir is T n Irreducible water saturation at ; represents the water phase diversion rate derivative corresponding to the water saturation of the oil-water front of the nth oil layer in the target reservoir; It represents the average water saturation of the two-phase zone of the nth oil layer in the target reservoir.

[0038] In some embodiments, the irreducible water saturation of multiple oil layers in the target oil reservoir can be obtained; according to the irreducible water saturation and water phase diversion rate curves of the multiple oil layers, the formula Determine the water saturation of the oil-water front of multiple oil layers. Where n represents the nth oil layer of the target reservoir; T n represents the average temperature of the nth oil layer in the target reservoir; It represents the water saturation of the oil-water front of the nth oil layer in the target reservoir; Indicates that the average temperature of the nth oil layer in the target reservoir is T n Irreducible water saturation at ; The water phase diversion rate represents the water saturation of the oil-water front of the nth oil layer in the target reservoir; It represents the water phase diversion rate derivative of the water saturation of the oil-water front of the nth oil layer in the target reservoir.

[0039] The water saturation of the oil-water front of multiple oil layers was determined by the irreducible water saturation and water phase diversion rate curves of multiple oil layers, laying a data foundation for the subsequent calculation of the average water saturation in the two-phase zone of multiple oil layers.

[0040] The irreducible water saturation of each oil layer in the target reservoir can be obtained. According to the relationship curve between water phase diversion rate and water saturation at different temperatures of each oil layer and the irreducible water saturation of each oil layer, the water saturation of the oil-water front of each oil layer can be calculated using the following formula:

[0041]

[0042] Where n represents the nth oil layer of the target reservoir; T n represents the average temperature of the nth oil layer in the target reservoir; It represents the water saturation of the oil-water front of the nth oil layer in the target reservoir; Indicates that the average temperature of the nth oil layer in the target reservoir is T n Irreducible water saturation at ; It represents the water phase diversion rate corresponding to the water saturation of the oil-water front of the nth oil layer in the target reservoir; It represents the water phase diversion rate derivative corresponding to the water saturation of the oil-water front of the nth oil layer in the target reservoir.

[0043] In some embodiments, the multiple oil layers of the target oil reservoir may be divided into multiple first oil layers and multiple second oil layers according to the average water saturation of the multiple oil layers of the target oil reservoir and the average water saturation of the two-phase region.

[0044] The average water saturation of multiple oil layers in the target reservoir and the average water saturation of the two-phase zone are used to divide the seen gasoline layer and the unseen gasoline layer, which helps to achieve balanced displacement of different oil layers based on the differences between the seen gasoline layer and the unseen gasoline layer.

[0045] According to the average water saturation of each oil layer in the target oil reservoir and the average water saturation of the two-phase zone, the multiple oil layers in the target oil reservoir can be divided into multiple seen gasoline layers and multiple unseen gasoline layers. Specifically, it can be judged whether the average water saturation of each oil layer in the target oil reservoir is greater than the average water saturation of the two-phase zone of each oil layer in the target oil reservoir. If the average water saturation of an oil layer in the target oil reservoir is greater than the average water saturation of the two-phase zone of each oil layer in the target oil reservoir, then this oil layer can be regarded as a seen gasoline layer, that is, the first oil layer. If the average water saturation of an oil layer in the target oil reservoir is less than or equal to the average water saturation of the two-phase zone of each oil layer in the target oil reservoir, then this oil layer can be regarded as an unseen gasoline layer, that is, the second oil layer.

[0046] S103: Calculating first water saturations at outlet ends of the plurality of first oil layers and oil-water front positions of the plurality of second oil layers according to water phase split rate curves of the plurality of oil layers; the first water saturation is the current water saturation.

[0047] In some embodiments, based on the average water saturation and water phase diversion rate curves of the plurality of first oil layers, the formula Calculate the first water saturation of the outlet ends of the plurality of first oil layers. Wherein, i represents the i-th first oil layer of the target oil reservoir; represents the first water saturation at the outlet of the i-th first oil layer of the target reservoir; represents the average water saturation of the i-th first oil layer of the target reservoir; represents the water phase splitting rate corresponding to the first water saturation at the outlet end of the i-th first oil layer of the target reservoir; It represents the water phase diversion rate derivative corresponding to the first water saturation at the outlet end of the i-th first oil layer of the target reservoir.

[0048] The first water saturation at the outlet of the visible gasoline layer is calculated through the average water saturation of the visible gasoline layer and the water phase split rate curve, which lays a data foundation for the accurate calculation of the configuration information of the visible gasoline layer during balanced displacement.

[0049] Based on the water phase split rate-water saturation curve of each first oil layer, the average water saturation of each first oil layer can be substituted into the following formula, and then the first water saturation at the outlet of each first oil layer can be calculated.

[0050]

[0051] In the formula, i represents the i-th first oil layer of the target reservoir; represents the first water saturation at the outlet of the i-th first oil layer of the target reservoir; represents the average water saturation of the i-th first oil layer of the target reservoir; represents the water phase splitting rate corresponding to the first water saturation at the outlet end of the i-th first oil layer of the target reservoir; It represents the water phase diversion rate derivative corresponding to the first water saturation at the outlet of the i-th first oil layer of the target reservoir.

[0052] In some embodiments, according to the average water saturation of the plurality of second oil layers, the average water saturation of the two-phase region, the irreducible water saturation, and the distance between the steam injection well and the oil production well, the formula Calculate the oil-water front positions of the plurality of second oil layers. Wherein, j represents the jth second oil layer of the target oil reservoir; represents the oil-water front position of the jth second oil layer in the target reservoir; represents the average water saturation of the jth second oil layer in the target reservoir; T j represents the average temperature of the jth second oil layer in the target reservoir; Indicates that the average temperature of the jth second oil layer in the target reservoir is T j Irreducible water saturation at ; represents the average water saturation of the two-phase region of the jth second oil layer of the target reservoir; L j It represents the distance between the steam injection well and the oil production well in the jth second oil layer of the target reservoir.

[0053] The oil-water front position of the unseen gasoline layer is calculated by the average water saturation of the unseen gasoline layer, the average water saturation of the two-phase zone, the irreducible water saturation and the distance between the steam injection well and the oil production well, which lays a data foundation for the accurate calculation of the configuration information of the unseen gasoline layer during balanced displacement.

[0054] According to the average water saturation of each second oil layer, the average water saturation of the two-phase zone, the irreducible water saturation and the distance between the steam injection well and the oil production well, the oil-water front position of each second oil layer can be calculated using the following formula.

[0055]

[0056] In the formula, j represents the jth second oil layer of the target reservoir; represents the oil-water front position of the jth second oil layer in the target reservoir; represents the average water saturation of the jth second oil layer in the target reservoir; T j represents the average temperature of the jth second oil layer in the target reservoir; Indicates that the average temperature of the jth second oil layer in the target reservoir is T jIrreducible water saturation at ; represents the average water saturation of the two-phase region of the jth second oil layer of the target reservoir; L j It represents the distance between the steam injection well and the oil production well in the jth second oil layer of the target reservoir.

[0057] S104: Calculating configuration information of the multiple oil layers in the target oil reservoir during balanced displacement according to the first water saturations at the outlet ends of the multiple first oil layers and the oil-water front positions of the multiple second oil layers.

[0058] In some embodiments, based on the first water saturation of the multiple first oil layer outlet ends, the second water saturation of the multiple first oil layer outlet ends and the third water saturation of the multiple second oil layer outlet ends can be determined; the second water saturation and the third water saturation are the water saturations at the time of balanced displacement.

[0059] By determining the second water saturation at the outlet ends of multiple visible gasoline layers and the third water saturation at the outlet ends of multiple unseen gasoline layers in the target oil reservoir during balanced displacement, the configuration information of multiple oil layers during balanced displacement can be calculated, which helps to achieve balanced utilization of multiple oil layers in the target oil reservoir.

[0060] According to the first water saturations of the multiple first oil layer outlets, an initial water saturation value may be set. For example, the arithmetic mean or maximum value of the first water saturations of the multiple first oil layer outlets may be used as the set initial water saturation value. The set initial water saturation value may be used to initialize the water saturations of all oil layer outlets in the target reservoir, and then determine the second water saturations of the multiple visible gasoline layer outlets and the third water saturations of the multiple unseen gasoline layer outlets.

[0061] In some embodiments, the porosity, cross-sectional area and control time of the plurality of first oil layers can be obtained; according to the porosity, cross-sectional area, control time of the plurality of first oil layers and the second water saturation at the outlet of the plurality of first oil layers, the formula Calculate the configuration information of the multiple first oil layers during balanced displacement. Wherein, i represents the i-th first oil layer of the target reservoir; Q i represents the configuration information of the first oil layer of the target reservoir; L i represents the distance between the steam injection well and the oil production well in the first oil layer of the target reservoir; φ i A represents the porosity of the first oil layer of the target reservoir; i represents the cross-sectional area of ​​the first oil layer of the target reservoir; Δt represents the regulation time; represents the first water saturation at the outlet of the i-th first oil layer of the target reservoir; represents the water phase diversion rate derivative corresponding to the first water saturation at the outlet end of the i-th first oil layer of the target reservoir; It represents the second water saturation at the outlet of the i-th first oil layer of the target reservoir during balanced displacement; It represents the water phase diversion rate derivative corresponding to the second water saturation at the outlet of the i-th first oil layer of the target reservoir during balanced displacement.

[0062] The configuration information of the seen gasoline layer during balanced displacement is calculated by the porosity, cross-sectional area, regulation time and the second water saturation at the outlet of the seen gasoline layer. Based on the configuration information of the seen gasoline layer, balanced utilization of multiple oil layers in the target reservoir can be achieved.

[0063] The porosity, cross-sectional area and control time of each first oil layer can be obtained. According to the first water saturation, porosity, control time and cross-sectional area of ​​each first oil layer outlet in the set target reservoir, the configuration information corresponding to the water saturation of each first oil layer outlet can be calculated using the following formula:

[0064]

[0065] Where i represents the i-th first oil layer of the target reservoir; Q i represents the configuration information of the first oil layer of the target reservoir; L i represents the distance between the steam injection well and the oil production well in the first oil layer of the target reservoir; φ i A represents the porosity of the first oil layer of the target reservoir; i represents the cross-sectional area of ​​the first oil layer of the target reservoir; Δt represents the regulation time; represents the first water saturation at the outlet of the i-th first oil layer of the target reservoir; represents the water phase diversion rate derivative corresponding to the first water saturation at the outlet end of the i-th first oil layer of the target reservoir; It represents the second water saturation at the outlet of the i-th first oil layer of the target reservoir during balanced displacement; It represents the water phase diversion rate derivative corresponding to the second water saturation at the outlet of the i-th first oil layer of the target reservoir during balanced displacement.

[0066] In some embodiments, the porosity, cross-sectional area and control time of multiple second oil layers can be obtained; according to the porosity, cross-sectional area, control time, oil-water front position of the multiple second oil layers and the third water saturation at the outlet of the multiple second oil layers, the formula Calculate the configuration information of the multiple second oil layers during balanced displacement. Wherein, j represents the jth second oil layer of the target reservoir; Q j represents the configuration information of the jth second oil layer of the target reservoir; Lj represents the distance between the steam injection well and the oil production well in the jth second oil layer of the target reservoir; φ j A represents the porosity of the jth second oil layer in the target reservoir; j represents the cross-sectional area of ​​the jth second oil layer in the target reservoir; Δt represents the regulation time; represents the fourth water saturation of the oil-water front position of the j-th second oil layer of the target oil reservoir; the fourth water saturation is the current water saturation; represents the water phase split rate derivative corresponding to the fourth water saturation of the oil-water front position of the j-th second oil layer of the target reservoir; represents the oil-water front position of the jth second oil layer in the target reservoir; It represents the third water saturation at the outlet of the jth second oil layer of the target reservoir during balanced displacement; It represents the water phase diversion rate derivative corresponding to the third water saturation at the outlet of the j-th second oil layer of the target reservoir during balanced displacement.

[0067] The configuration information of the unseen gasoline layer during balanced displacement is calculated by the porosity, cross-sectional area, regulation time and oil-water front position of the unseen gasoline layer. Based on the configuration information of the unseen gasoline layer, balanced utilization of multiple oil layers in the target reservoir can be achieved.

[0068] The porosity, cross-sectional area and control time of each second oil layer can be obtained. According to the water saturation, porosity, cross-sectional area, control time, oil-water front position and the third water saturation of the outlet ends of the plurality of second oil layers, the configuration information corresponding to the water saturation of each second oil layer outlet can be calculated using the following formula:

[0069]

[0070] Where, j represents the jth second oil layer of the target reservoir; Q j represents the configuration information of the jth second oil layer of the target reservoir; L j represents the distance between the steam injection well and the oil production well in the jth second oil layer of the target reservoir; φ j A represents the porosity of the jth second oil layer in the target reservoir; j represents the cross-sectional area of ​​the jth second oil layer in the target reservoir; Δt represents the regulation time; represents the fourth water saturation of the oil-water front position of the j-th second oil layer of the target oil reservoir; the fourth water saturation is the current water saturation; represents the water phase split rate derivative corresponding to the fourth water saturation of the oil-water front position of the j-th second oil layer of the target reservoir; represents the oil-water front position of the jth second oil layer in the target reservoir; It represents the third water saturation at the outlet of the jth second oil layer of the target reservoir during balanced displacement; It represents the water phase diversion rate derivative corresponding to the third water saturation at the outlet of the j-th second oil layer of the target reservoir during balanced displacement.

[0071] In some embodiments, according to the first water saturation of the plurality of first oil layer outlet ends and the preset water saturation increment, the second water saturation of the plurality of first oil layer outlet ends and the third water saturation of the plurality of second oil layer outlet ends are determined; according to the second water saturation of the plurality of first oil layer outlet ends and the third water saturation of the plurality of second oil layer outlet ends, the configuration information of the plurality of first oil layers and the plurality of second oil layers during balanced displacement is calculated; the configuration information of the plurality of first oil layers and the plurality of second oil layers during balanced displacement satisfies the formula ∑Q n =Q s and the formula ∑Q n =∑Q i +∑Q j In the formula, Q s represents the preset total configuration information; n represents the nth oil layer of the target reservoir; Q n represents the configuration information of the nth oil layer of the target oil reservoir; i represents the i-th first oil layer of the target oil reservoir; Q i represents the configuration information of the i-th first oil layer of the target oil reservoir; j represents the j-th second oil layer of the target oil reservoir; Q j Represents the configuration information of the j-th second oil layer of the target reservoir.

[0072] By determining the second water saturation at the outlet ends of multiple visible gasoline layers and the third water saturation at the outlet ends of multiple unseen gasoline layers in the target oil reservoir during balanced displacement, the configuration information of multiple oil layers during balanced displacement can be calculated, which helps to achieve balanced utilization of multiple oil layers in the target oil reservoir.

[0073] According to the first water saturation of the outlet ends of the multiple first oil layers, an initial water saturation value can be set. For example, the arithmetic mean or maximum value of the first water saturation of the outlet ends of the multiple first oil layers can be used as the set initial water saturation value. The set initial water saturation value can be used to initialize the water saturation of the outlet ends of all oil layers in the target oil reservoir, and then determine the second water saturation of the outlet ends of the multiple seen gasoline layers and the third water saturation of the outlet ends of the multiple unseen gasoline layers. According to the second water saturation of the outlet ends of the multiple seen gasoline layers and the third water saturation of the outlet ends of the multiple unseen gasoline layers in the target oil reservoir, the configuration information of all oil layers in the target oil reservoir can be determined. It can be judged whether the configuration information of all oil layers in the target oil reservoir satisfies the following formula.

[0074] ∑Q n =Q s ;

[0075] ∑Q n =∑Q i +∑Q j ;

[0076] In the formula, Q s represents the preset total configuration information; n represents the nth oil layer of the target reservoir; Q n represents the configuration information of the nth oil layer of the target oil reservoir; i represents the i-th first oil layer of the target oil reservoir; Q i represents the configuration information of the i-th first oil layer of the target oil reservoir; j represents the j-th second oil layer of the target oil reservoir; Q j Represents the configuration information of the j-th second oil layer of the target reservoir.

[0077] A water saturation increment can be preset. If the configuration information of all oil layers in the target reservoir does not satisfy the above formula, the water saturation at the outlet of all oil layers in the target reservoir is added with the preset water saturation increment to obtain the updated water saturation at the outlet of all oil layers in the target reservoir and the corresponding configuration information. Repeat this process until the configuration information of all oil layers in the target reservoir satisfies the above formula.

[0078] A specific embodiment of this specification is given below:

[0079] 1. Collect the reservoir parameters, development parameters before stratified heat injection and injection parameters of reservoir A. Reservoir parameters include the thickness, porosity and relative permeability curve of each oil layer in reservoir A (see Figure 4 ), water phase relative permeability curve (see Figure 4 ), irreducible water saturation at different temperatures (see Table 1) and the crude oil viscosity-temperature relationship (see Figure 5 ) etc. The development status parameters before stratified heat injection include the average temperature of each oil layer in reservoir A and the average water saturation of each oil layer. The injection parameters include the configuration information and control time of each oil layer in reservoir A. Reservoir A includes oil layer 1, oil layer 2 and oil layer 3 (see Figure 6 ).

[0080] 2. See Figure 4 , Figure 4 The schematic diagram of the relative permeability curve of the oil phase and the relative permeability curve of the water phase at 100°C in reservoir A is shown. Considering the temperature difference of each oil layer caused by different steam absorption before stratified steam injection, the viscosity and relative permeability of crude oil are affected by the temperature effect, and the water phase diversion rate curve of each oil layer is calculated (see Figure 7 ).

[0081] Table 1

[0082]

[0083] 3. Based on the reservoir parameters of reservoir A in Table 1 and the development status parameters before stratified heat injection, combined with the oil phase relative permeability curve (see Figure 4 ), water phase relative permeability curve (see Figure 4 ) and crude oil viscosity-temperature relationship curve (see Figure 5 ) to determine the water saturation at the front of each oil layer and the average water saturation in the two-phase zone (see Table 2).

[0084] Table 2

[0085] Oil layer Front water saturation Average water saturation in two-phase zone Oil layer 1 0.604 0.657 Oil layer 2 0.546 0.604 Oil layer 3 0.496 0.557

[0086] 4. Comparing the average water saturation of each oil layer in reservoir A before stratified heat injection in Table 1 and the average water saturation of the two-phase zone of each oil layer in reservoir A in Table 2, it can be seen that gas has appeared in oil layer 1 in reservoir A, but no gas has appeared in oil layers 2 and 3. For the layers without gasoline at the outlet (oil layers 2 and 3), the position of the oil-water front is calculated. For oil layer 1, the water saturation at the outlet can be determined (see Table 3); for oil layers 2 and 3, the position of the oil-water front can be determined (see Table 3).

[0087] Table 3

[0088] Oil layer Water saturation at outlet Oil-water front position / m Oil layer 1 0.608 - Oil layer 2 - 182.1 Oil layer 3 - 176.9

[0089] 5. Assuming the initial value of the water saturation at the outlet of each oil layer in reservoir A, calculate the injection rate of each oil layer respectively. If the sum of the steam injection rate of each layer is equal to the designed total steam injection rate, the solution is completed; otherwise, continue the calculation. Based on the designed daily steam injection rate and control time in Table 1, assuming the water saturation at the outlet, when the total steam injection rate of each oil layer reaches the design requirement, the calculation is completed, which is the calculation result (see Table 4).

[0090] Table 4

[0091]

[0092] Based on the above-mentioned configuration information calculation method for balanced steam drive, the embodiment of this specification can determine the water phase split rate curves of multiple oil layers according to the temperature of multiple oil layers in the target oil reservoir; divide the multiple oil layers of the target oil reservoir into multiple first oil layers and multiple second oil layers according to the average water saturation of the multiple oil layers in the target oil reservoir; the first oil layer is a gasoline layer that has been seen; the second oil layer is an unseen gasoline layer; calculate the first water saturation at the outlet of the multiple first oil layers and the oil-water front position of the multiple second oil layers according to the water phase split rate curves of the multiple oil layers; the first water saturation is the current water saturation; calculate the configuration information of the multiple oil layers of the target oil reservoir during balanced displacement according to the first water saturation at the outlet of the multiple first oil layers and the oil-water front position of the multiple second oil layers. The embodiment of this specification can more accurately calculate the configuration information of each oil layer during balanced displacement according to the temperature of each oil layer, and can reduce the amount of steam entering the high permeability layer and increase the amount of steam entering the low permeability layer according to the configuration information of each oil layer during displacement, thereby realizing the balanced use of heavy oil reserves in each oil layer.

[0093] Based on the above-mentioned method for calculating configuration information of balanced steam drive, this specification also proposes an embodiment of a device for calculating configuration information of balanced steam drive. Figure 8 As shown, the configuration information calculation device 800 for balanced steam flooding may specifically include the following modules:

[0094] The determination module 801 may be used to determine water phase split rate curves of multiple oil layers according to the temperatures of multiple oil layers in the target oil reservoir.

[0095] The division module 802 can be used to divide the multiple oil layers of the target oil reservoir into multiple first oil layers and multiple second oil layers according to the average water saturation of the multiple oil layers of the target oil reservoir; the first oil layer is the visible gasoline layer; the second oil layer is the non-visible gasoline layer.

[0096] The first calculation module 803 can be used to calculate the first water saturation at the outlet ends of the multiple first oil layers and the oil-water front positions of the multiple second oil layers according to the water phase diversion rate curves of the multiple oil layers; the first water saturation is the current water saturation;.

[0097] The second calculation module 804 may be used to calculate the configuration information of the multiple oil layers in the target oil reservoir during balanced displacement according to the first water saturations at the outlet ends of the multiple first oil layers and the oil-water front positions of the multiple second oil layers.

[0098] In some embodiments, the above-mentioned determination module 801 can be specifically used to obtain the average water saturation of multiple oil layers in the target oil reservoir; determine the relative permeability of the multiple oil layers in the target oil reservoir according to the temperature and the average water saturation of the multiple oil layers in the target oil reservoir; the relative permeability of the multiple oil layers in the target oil reservoir includes the water phase relative permeability of the multiple oil layers and the oil phase relative permeability of the multiple oil layers; determine the oil phase viscosity of the multiple oil layers in the target oil reservoir according to the temperature of the multiple oil layers in the target oil reservoir; determine the water phase diversion rate curve of the multiple oil layers according to the oil phase viscosity, water phase relative permeability and oil phase relative permeability of the multiple oil layers in the target oil reservoir using the following formula:

[0099]

[0100] In the formula, n represents the nth oil layer of the target reservoir; It represents the average water saturation of the nth oil layer in the target reservoir; It represents the water phase diversion rate corresponding to the average water saturation of the nth oil layer in the target reservoir; represents the water phase viscosity of the nth oil layer in the target reservoir, is a fixed value; It represents the oil phase viscosity of the nth oil layer in the target reservoir; It represents the relative permeability of water phase in the nth oil layer of the target reservoir; It represents the oil phase relative permeability of the nth oil layer in the target reservoir.

[0101] In some embodiments, the above-mentioned division module 802 can be specifically used to determine the average water saturation of the two-phase region of the multiple oil layers according to the irreducible water saturation of the multiple oil layers, the water saturation of the oil-water front, and the water phase split rate curve using the following formula:

[0102]

[0103] Where n represents the nth oil layer of the target reservoir; T n represents the average temperature of the nth oil layer in the target reservoir; It represents the water saturation of the oil-water front of the nth oil layer in the target reservoir; The average temperature is T n is the irreducible water saturation of the nth oil layer in the target reservoir; represents the water phase diversion rate derivative corresponding to the water saturation of the oil-water front of the nth oil layer in the target reservoir; It represents the average water saturation of the two-phase zone of the nth oil layer in the target reservoir.

[0104] In some embodiments, the above-mentioned division module 802 can also be used to obtain irreducible water saturation of multiple oil layers in the target oil reservoir; according to the irreducible water saturation of the multiple oil layers and the water phase diversion rate curve, the water saturation of the oil-water front of the multiple oil layers is determined using the following formula:

[0105]

[0106] Where n represents the nth oil layer of the target reservoir; T n represents the average temperature of the nth oil layer in the target reservoir; It represents the water saturation of the oil-water front of the nth oil layer in the target reservoir; Indicates that the average temperature of the nth oil layer in the target reservoir is T n Irreducible water saturation at ; It represents the water phase diversion rate corresponding to the water saturation of the oil-water front of the nth oil layer in the target reservoir; It represents the water phase diversion rate derivative corresponding to the water saturation of the oil-water front of the nth oil layer in the target reservoir.

[0107] In some embodiments, the division module 802 may be specifically used to divide the multiple oil layers of the target oil reservoir into multiple first oil layers and multiple second oil layers according to the average water saturation of the multiple oil layers of the target oil reservoir and the average water saturation of the two-phase zone.

[0108] In some embodiments, the first calculation module 803 may be specifically used to calculate the first water saturation at the outlet of the plurality of first oil layers according to the average water saturation of the plurality of first oil layers and the water phase split rate curve using the following formula:

[0109]

[0110] In the formula, i represents the i-th first oil layer of the target reservoir; represents the first water saturation at the outlet of the i-th first oil layer of the target reservoir; represents the average water saturation of the i-th first oil layer of the target reservoir; represents the water phase splitting rate corresponding to the first water saturation at the outlet end of the i-th first oil layer of the target reservoir; It represents the water phase diversion rate derivative corresponding to the first water saturation at the outlet end of the i-th first oil layer of the target reservoir.

[0111] In some embodiments, the first calculation module 803 may be further used to calculate the oil-water front positions of the plurality of second oil layers using the following formula according to the average water saturation of the plurality of second oil layers, the average water saturation of the two-phase region, the irreducible water saturation, and the distance between the steam injection well and the oil production well:

[0112]

[0113] In the formula, j represents the jth second oil layer of the target reservoir; represents the oil-water front position of the jth second oil layer in the target reservoir; represents the average water saturation of the jth second oil layer in the target reservoir; T j represents the average temperature of the jth second oil layer in the target reservoir; The average temperature is T j The irreducible water saturation of the jth second oil layer in the target reservoir at time t; represents the average water saturation of the two-phase region of the jth second oil layer of the target reservoir; L j It represents the distance between the steam injection well and the oil production well in the jth second oil layer of the target reservoir.

[0114] In some embodiments, the second calculation module 804 can be specifically used to determine the first water saturation of the multiple first oil layer outlet ends, the second water saturation of the multiple first oil layer outlet ends and the third water saturation of the multiple second oil layer outlet ends; the second water saturation and the third water saturation are the water saturations during balanced displacement.

[0115] In some embodiments, the second calculation module 804 may also be used to obtain the porosity, cross-sectional area and control time of the plurality of first oil layers; and calculate the configuration information of the plurality of first oil layers during balanced displacement using the following formula according to the porosity, cross-sectional area, control time of the plurality of first oil layers and the second water saturation at the outlet of the plurality of first oil layers:

[0116]

[0117] Where i represents the i-th first oil layer of the target reservoir; Q i represents the configuration information of the first oil layer of the target reservoir; L i represents the distance between the steam injection well and the oil production well in the first oil layer of the target reservoir; φ i A represents the porosity of the first oil layer of the target reservoir; i represents the cross-sectional area of ​​the first oil layer of the target reservoir; Δt represents the regulation time; represents the first water saturation at the outlet of the i-th first oil layer of the target reservoir; represents the water phase diversion rate derivative corresponding to the first water saturation at the outlet end of the i-th first oil layer of the target reservoir; It represents the second water saturation at the outlet of the i-th first oil layer of the target reservoir during balanced displacement; It represents the water phase diversion rate derivative corresponding to the second water saturation at the outlet of the i-th first oil layer of the target reservoir during balanced displacement.

[0118] In some embodiments, the second calculation module 804 may be specifically used to obtain the porosity, cross-sectional area and control time of the plurality of second oil layers; and according to the porosity, cross-sectional area, control time, oil-water front position of the plurality of second oil layers and the third water saturation at the outlet of the plurality of second oil layers, the configuration information of the plurality of second oil layers during balanced displacement is calculated using the following formula:

[0119]

[0120] Where, j represents the jth second oil layer of the target reservoir; Q j represents the configuration information of the jth second oil layer of the target reservoir; L j represents the distance between the steam injection well and the oil production well in the jth second oil layer of the target reservoir; φ j A represents the porosity of the jth second oil layer in the target reservoir; j represents the cross-sectional area of ​​the jth second oil layer in the target reservoir; Δt represents the regulation time; represents the fourth water saturation of the oil-water front position of the j-th second oil layer of the target oil reservoir; the fourth water saturation is the current water saturation; represents the water phase split rate derivative corresponding to the fourth water saturation of the oil-water front position of the j-th second oil layer of the target reservoir; represents the oil-water front position of the jth second oil layer in the target reservoir; It represents the third water saturation at the outlet of the jth second oil layer of the target reservoir during balanced displacement; It represents the water phase diversion rate derivative corresponding to the third water saturation at the outlet of the j-th second oil layer of the target reservoir during balanced displacement.

[0121] In some embodiments, the second calculation module 804 may also be specifically used to determine the second water saturation of the multiple first oil layer outlet ends and the third water saturation of the multiple second oil layer outlet ends according to the first water saturation of the multiple first oil layer outlet ends and the preset water saturation increment; calculate the configuration information of the multiple first oil layers and the multiple second oil layers during balanced displacement according to the second water saturation of the multiple first oil layer outlet ends and the third water saturation of the multiple second oil layer outlet ends; the configuration information of the multiple first oil layers and the multiple second oil layers during balanced displacement satisfies the following formula:

[0122] ∑Q n =Q s ;

[0123] ∑Q n =∑Q i +∑Q j ;

[0124] In the formula, Q s represents the preset total configuration information; n represents the nth oil layer of the target reservoir; Q n represents the configuration information of the nth oil layer of the target oil reservoir; i represents the i-th first oil layer of the target oil reservoir; Q i represents the configuration information of the i-th first oil layer of the target oil reservoir; j represents the j-th second oil layer of the target oil reservoir; Q j Represents the configuration information of the j-th second oil layer of the target reservoir.

[0125] It should be noted that the units, devices or modules described in the above embodiments can be implemented by computer chips or entities, or by products with certain functions. For the convenience of description, the above devices are described separately by functions divided into various modules. Of course, when implementing this specification, the functions of each module can be implemented in the same or more software and / or hardware, or the modules that implement the same function can be implemented by a combination of multiple sub-modules or sub-units. The device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0126] As can be seen from the above, based on the configuration information calculation device of balanced steam drive provided by the embodiment of this specification, the water phase split rate curve of multiple oil layers can be determined according to the temperature of multiple oil layers in the target oil reservoir; according to the average water saturation of multiple oil layers in the target oil reservoir, the multiple oil layers in the target oil reservoir are divided into multiple first oil layers and multiple second oil layers; the first oil layer is a gasoline layer that has been seen; the second oil layer is an unseen gasoline layer; according to the water phase split rate curve of the multiple oil layers, the first water saturation at the outlet of the multiple first oil layers and the oil-water front position of the multiple second oil layers are calculated; the first water saturation is the current water saturation; according to the first water saturation at the outlet of the multiple first oil layers and the oil-water front position of the multiple second oil layers, the configuration information of the multiple oil layers in the target oil reservoir during balanced displacement is calculated. Compared with the existing method, the configuration information of each oil layer during balanced displacement can be calculated more accurately according to the temperature of each oil layer, and the amount of steam entering the high permeability layer can be reduced and the amount of steam entering the low permeability layer can be increased according to the configuration information of each oil layer during displacement, thereby realizing the balanced use of heavy oil reserves in each oil layer.

[0127] The embodiment of the present specification also provides a computer device for calculating the configuration information of balanced steam drive, including a processor and a memory for storing instructions executable by the processor, wherein the processor can perform the following steps according to the instructions when implemented: determining the water phase split rate curves of the multiple oil layers according to the temperatures of the multiple oil layers in the target oil reservoir; dividing the multiple oil layers in the target oil reservoir into multiple first oil layers and multiple second oil layers according to the average water saturation of the multiple oil layers in the target oil reservoir; the first oil layer is a gasoline layer that has been seen; the second oil layer is a gasoline layer that has not been seen; calculating the first water saturation at the outlet ends of the multiple first oil layers and the oil-water front positions of the multiple second oil layers according to the water phase split rate curves of the multiple oil layers; the first water saturation is the current water saturation; calculating the configuration information of the multiple oil layers in the target oil reservoir during balanced displacement according to the first water saturation at the outlet ends of the multiple first oil layers and the oil-water front positions of the multiple second oil layers.

[0128] In order to complete the above instructions more accurately, refer to Fig. 9 As shown, the embodiment of this specification also provides another specific computer device 900, wherein the computer device 900 includes a network communication port 901, a processor 902 and a memory 903, and the above structures are connected through internal cables so that each structure can perform specific data interaction.

[0129] The processor 902 can be specifically used to determine the water phase split rate curves of the multiple oil layers according to the temperatures of the multiple oil layers in the target oil reservoir; divide the multiple oil layers of the target oil reservoir into multiple first oil layers and multiple second oil layers according to the average water saturation of the multiple oil layers in the target oil reservoir; the first oil layer is a visible gasoline layer; the second oil layer is an unseen gasoline layer; calculate the first water saturation at the outlet ends of the multiple first oil layers and the oil-water front positions of the multiple second oil layers according to the water phase split rate curves of the multiple oil layers; the first water saturation is the current water saturation; calculate the configuration information of the multiple oil layers in the target oil reservoir during balanced displacement according to the first water saturation at the outlet ends of the multiple first oil layers and the oil-water front positions of the multiple second oil layers.

[0130] The memory 903 may be specifically used to store corresponding instruction programs.

[0131] In this embodiment, the network communication port 901 can be a virtual port that is bound to different communication protocols so that different data can be sent or received. For example, the network communication port can be a port responsible for web data communication, a port responsible for FTP data communication, or a port responsible for email data communication. In addition, the network communication port can also be a physical communication interface or communication chip. For example, it can be a wireless mobile network communication chip, such as GSM, CDMA, etc.; it can also be a Wifi chip; it can also be a Bluetooth chip.

[0132] In this embodiment, the processor 902 may be implemented in any appropriate manner. For example, the processor may take the form of a microprocessor or processor and a computer-readable medium storing a computer-readable program code (such as software or firmware) executable by the (micro)processor, a logic gate, a switch, an application specific integrated circuit (ASIC), a programmable logic controller, and an embedded microcontroller, etc. This specification does not limit this.

[0133] In this embodiment, the memory 903 includes a volatile memory and a non-volatile memory. The memory 903 may include multiple levels. In a digital system, anything that can store binary data can be a memory; in an integrated circuit, a circuit with a storage function without a physical form is also called a memory, such as RAM, FIFO, etc.; in a system, a storage device with a physical form is also called a memory, such as a memory stick, TF card, etc.

[0134] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0135] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0136] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0137] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0138] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for calculating configuration information of balanced steam flooding, characterized in that: include: Determine water phase split rate curves of multiple oil layers according to the temperatures of multiple oil layers in the target oil reservoir; According to the average water saturation of the multiple oil layers in the target oil reservoir, the multiple oil layers in the target oil reservoir are divided into multiple first oil layers and multiple second oil layers; the first oil layers are the layers with gasoline; and the second oil layers are the layers without gasoline; Calculating the first water saturation at the outlet of the plurality of first oil layers and the oil-water front position of the plurality of second oil layers according to the water phase split rate curves of the plurality of oil layers; The first water saturation is the current water saturation; According to the first water saturations at the outlet ends of the plurality of first oil layers and the oil-water front positions of the plurality of second oil layers, configuration information of the plurality of oil layers in the target oil reservoir during balanced displacement is calculated.

2. The method according to claim 1, characterized in that: The method of determining the water phase split rate curves of the multiple oil layers according to the temperatures of the multiple oil layers in the target oil reservoir comprises: Obtain the average water saturation of multiple oil layers in the target reservoir; Determining the relative permeability of the multiple oil layers in the target oil reservoir according to the temperature and average water saturation of the multiple oil layers in the target oil reservoir; the relative permeability of the multiple oil layers in the target oil reservoir includes the relative permeability of the water phase of the multiple oil layers and the relative permeability of the oil phase of the multiple oil layers; determining the oil phase viscosity of the multiple oil layers in the target oil reservoir according to the temperatures of the multiple oil layers in the target oil reservoir; According to the oil phase viscosity, water phase relative permeability and oil phase relative permeability of multiple oil layers in the target oil reservoir, the water phase split rate curves of the multiple oil layers are determined using the following formula: In the formula, n represents the nth oil layer of the target reservoir; It represents the average water saturation of the nth oil layer in the target reservoir; It represents the water phase diversion rate corresponding to the average water saturation of the nth oil layer in the target reservoir; represents the water phase viscosity of the nth oil layer in the target reservoir, is a fixed value; It represents the oil phase viscosity of the nth oil layer in the target reservoir; It represents the relative permeability of water phase in the nth oil layer of the target reservoir; It represents the oil phase relative permeability of the nth oil layer in the target reservoir.

3. The method according to claim 1, characterized in that: The method further comprises: According to the irreducible water saturation of the multiple oil layers, the water saturation of the oil-water front and the water phase split rate curve, the average water saturation of the two-phase region of the multiple oil layers is determined using the following formula: Where n represents the nth oil layer of the target reservoir; T n represents the average temperature of the nth oil layer in the target reservoir; It represents the water saturation of the oil-water front of the nth oil layer in the target reservoir; The average temperature is T n is the irreducible water saturation of the nth oil layer in the target reservoir; represents the water phase diversion rate derivative corresponding to the water saturation of the oil-water front of the nth oil layer in the target reservoir; It represents the average water saturation of the two-phase zone of the nth oil layer in the target reservoir.

4. The method according to claim 3, characterized in that: The method further comprises: Obtain irreducible water saturation of multiple oil layers in the target reservoir; According to the irreducible water saturation and water phase split rate curves of the multiple oil layers, the water saturation of the oil-water front of the multiple oil layers is determined using the following formula: Where n represents the nth oil layer of the target reservoir; T n represents the average temperature of the nth oil layer in the target reservoir; It represents the water saturation of the oil-water front of the nth oil layer in the target reservoir; Indicates that the average temperature of the nth oil layer in the target reservoir is T n Irreducible water saturation at ; It represents the water phase diversion rate corresponding to the water saturation of the oil-water front of the nth oil layer in the target reservoir; It represents the water phase diversion rate derivative corresponding to the water saturation of the oil-water front of the nth oil layer in the target reservoir.

5. The method according to claim 1, characterized in that: The method of dividing the multiple oil layers of the target oil reservoir into multiple first oil layers and multiple second oil layers according to the average water saturation of the multiple oil layers of the target oil reservoir comprises: According to the average water saturation of the multiple oil layers in the target oil reservoir and the average water saturation of the two-phase region, the multiple oil layers in the target oil reservoir are divided into multiple first oil layers and multiple second oil layers.

6. The method according to claim 1, characterized in that: The step of calculating the first water saturation at the outlet ends of the plurality of first oil layers and the oil-water front positions of the plurality of second oil layers according to the water phase split rate curves of the plurality of oil layers comprises: According to the average water saturation of the plurality of first oil layers and the water phase split rate curve, the first water saturation at the outlet end of the plurality of first oil layers is calculated using the following formula: In the formula, i represents the i-th first oil layer of the target reservoir; represents the first water saturation at the outlet of the i-th first oil layer of the target reservoir; represents the average water saturation of the i-th first oil layer of the target reservoir; represents the water phase splitting rate corresponding to the first water saturation at the outlet end of the i-th first oil layer of the target reservoir; represents the water phase diversion rate derivative corresponding to the first water saturation at the outlet end of the i-th first oil layer of the target reservoir; According to the average water saturation of the multiple second oil layers, the average water saturation of the two-phase region, the irreducible water saturation and the distance between the steam injection well and the oil production well, the oil-water front positions of the multiple second oil layers are calculated using the following formula: In the formula, j represents the jth second oil layer of the target reservoir; represents the oil-water front position of the jth second oil layer in the target reservoir; represents the average water saturation of the jth second oil layer in the target reservoir; T j represents the average temperature of the jth second oil layer in the target reservoir; The average temperature is T j The irreducible water saturation of the jth second oil layer in the target reservoir at time t; represents the average water saturation of the two-phase region of the jth second oil layer in the target reservoir; L j It represents the distance between the steam injection well and the oil production well in the jth second oil layer of the target reservoir.

7. The method according to claim 1, characterized in that: The step of calculating the configuration information of the multiple oil layers in the target oil reservoir during balanced displacement according to the first water saturations at the outlet ends of the multiple first oil layers and the oil-water front positions of the multiple second oil layers includes: Determine the second water saturation of the plurality of first oil layer outlet ends and the third water saturation of the plurality of second oil layer outlet ends according to the first water saturation of the plurality of first oil layer outlet ends; the second water saturation and the third water saturation are the water saturations during balanced displacement; Obtaining the porosity, cross-sectional area and regulation time of multiple first oil layers; According to the porosity, cross-sectional area, control time of the multiple first oil layers and the second water saturation at the outlet ends of the multiple first oil layers, the configuration information of the multiple first oil layers during balanced displacement is calculated using the following formula: Where i represents the i-th first oil layer of the target reservoir; Q i represents the configuration information of the first oil layer of the target reservoir; L i represents the distance between the steam injection well and the oil production well in the first oil layer of the target reservoir; φ i A represents the porosity of the first oil layer of the target reservoir; i represents the cross-sectional area of ​​the first oil layer of the target reservoir; Δt represents the regulation time; represents the first water saturation at the outlet of the i-th first oil layer of the target reservoir; represents the water phase diversion rate derivative corresponding to the first water saturation at the outlet end of the i-th first oil layer of the target reservoir; It represents the second water saturation at the outlet of the i-th first oil layer of the target reservoir during balanced displacement; represents the water phase diversion rate derivative corresponding to the second water saturation at the outlet of the i-th first oil layer of the target reservoir during balanced displacement; Obtaining the porosity, cross-sectional area and regulation time of multiple second oil layers; According to the porosity, cross-sectional area, control time, oil-water front position of the plurality of second oil layers and the third water saturation at the outlet ends of the plurality of second oil layers, the configuration information of the plurality of second oil layers during balanced displacement is calculated using the following formula: Where, j represents the jth second oil layer of the target reservoir; Q j represents the configuration information of the jth second oil layer of the target reservoir; L j represents the distance between the steam injection well and the oil production well in the jth second oil layer of the target reservoir; φ j A represents the porosity of the jth second oil layer in the target reservoir; j represents the cross-sectional area of ​​the jth second oil layer in the target reservoir; Δt represents the regulation time; represents the fourth water saturation of the oil-water front position of the j-th second oil layer of the target oil reservoir; the fourth water saturation is the current water saturation; represents the water phase split rate derivative corresponding to the fourth water saturation of the oil-water front position of the j-th second oil layer of the target reservoir; represents the oil-water front position of the jth second oil layer in the target reservoir; It represents the third water saturation at the outlet of the jth second oil layer of the target reservoir during balanced displacement; It represents the water phase diversion rate derivative corresponding to the third water saturation at the outlet of the j-th second oil layer of the target reservoir during balanced displacement.

8. The method according to claim 7, characterized in that: The determining of the second water saturation of the plurality of first oil layer outlet ends and the third water saturation of the plurality of second oil layer outlet ends comprises: Determining a second water saturation of the plurality of first oil layer outlet ends and a third water saturation of the plurality of second oil layer outlet ends according to the first water saturation of the plurality of first oil layer outlet ends and a preset water saturation increment; According to the second water saturation at the outlet ends of the plurality of first oil layers and the third water saturation at the outlet ends of the plurality of second oil layers, the configuration information of the plurality of first oil layers and the plurality of second oil layers during balanced displacement is calculated; the configuration information of the plurality of first oil layers and the plurality of second oil layers during balanced displacement satisfies the following formula: ∑Q n =Q s ; ∑Q n =∑Q i +∑Q j ; In the formula, Q s represents the preset total configuration information; n represents the nth oil layer of the target reservoir; Q n represents the configuration information of the nth oil layer of the target oil reservoir; i represents the i-th first oil layer of the target oil reservoir; Q i represents the configuration information of the i-th first oil layer of the target oil reservoir; j represents the j-th second oil layer of the target oil reservoir; Q j Represents the configuration information of the j-th second oil layer of the target reservoir.

9. A configuration information calculation device for balanced steam drive, characterized in that: The device comprises: A determination module, for determining water phase split rate curves of the plurality of oil layers according to the temperatures of the plurality of oil layers in the target oil reservoir; A division module is used to divide the multiple oil layers of the target oil reservoir into multiple first oil layers and multiple second oil layers according to the average water saturation of the multiple oil layers of the target oil reservoir; the first oil layers are the gasoline layers; and the second oil layers are the gasoline layers that have not been seen; A first calculation module is used to calculate the first water saturation of the outlet ends of the plurality of first oil layers and the oil-water front positions of the plurality of second oil layers according to the water phase split rate curves of the plurality of oil layers; the first water saturation is the current water saturation; The second calculation module is used to calculate the configuration information of the multiple oil layers in the target oil reservoir during balanced displacement according to the first water saturations at the outlet ends of the multiple first oil layers and the oil-water front positions of the multiple second oil layers.

10. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the method according to any one of claims 1 to 8 is implemented.

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