Relative permeability curve construction method and device

Abstract

The present invention discloses a relative permeability curve construction method and device, wherein the method comprises: determining multiple permeability distribution intervals of a heterogeneous reservoir geological model; calculating the parameter values ​​corresponding to these characteristic parameters in each permeability distribution interval according to the regression relationship between irreducible water saturation, residual oil saturation, water phase relative permeability at residual oil saturation, oil phase index and water phase index and permeability; calculating the corresponding water saturation according to the irreducible water saturation and residual oil saturation corresponding to each permeability distribution interval, and calculating the corresponding oil phase relative permeability and water phase relative permeability according to the oil phase index and water phase index corresponding to each permeability distribution interval; drawing a relative permeability curve according to the water saturation, oil phase relative permeability and water phase relative permeability corresponding to each permeability distribution interval. The present invention can construct a relative permeability curve that meets the range of the permeability distribution interval of a heterogeneous reservoir.

Description

Technical Field

[0001] The invention relates to the technical field of oilfield development, and in particular to a relative permeability curve construction method and device. Background Art

[0002] This section is intended to provide a background or context to the embodiments of the invention recited in the claims. No admission is made that the description herein is prior art by inclusion in this section.

[0003] When two or three phases of fluid flow in a porous medium at the same time, relative permeability is a direct measure of the ability of each mobile phase to pass through the porous medium. Relative permeability is equal to the ratio of effective permeability to absolute permeability, expressed in % or f. Effective permeability refers to the permeability of a porous medium to a certain phase of fluid when multiple phases of fluid flow simultaneously; absolute permeability refers to the permeability of a single fluid through a porous medium.

[0004] Since the relative permeability test experiment has the problems of long test time and high test cost, the laboratory usually measures the relative permeability of the core based on a few coring samples. However, the actual reservoir is highly heterogeneous and has a wide permeability range, usually above 0.1mD to 1000mD. It is difficult to cover the permeability distribution range of the actual reservoir using only a few relative permeability curves.

[0005] To solve the above problems, two commonly used methods are: First, all the relative permeability curves measured experimentally are plotted into scatter plots, and the relative permeability curves of the oil phase and the water phase are fitted respectively to regress a set of relative permeabilities such as Figure 1 The relative permeability curve shown in the figure; the second one is to convert the water saturation S w Normalized to S WD Then, all the relative permeability curves measured experimentally are plotted into scatter plots, and the relative permeability curves of the oil phase and the water phase are fitted respectively to regress a set of relative permeabilities such as Figure 2 The relative permeability curve is shown in Figure 2, and then the water saturation S is normalized to WD Denormalize to water saturation S w Obviously, the results obtained by these two methods are inaccurate, because reservoirs with different permeability levels should use different relative permeability curves, and it is difficult to cover the permeability range of the actual reservoir using a set of relative permeability curves.

[0006] In addition to the above two methods, there is another method that is to saturate-standardize the measured relative permeability curve, regress an oil phase index no and a water phase index nw of the relative permeability curve, and then de-standardize the relative permeability curve into a set of dimensional relative permeability curves. The endpoint calibration method is used to assign values ​​to relative permeability curves of different types of reservoirs. The disadvantage of this method is that the oil phase index and the water phase index each have only one fixed value, but in fact, as the permeability of heterogeneous reservoirs changes from 0.1mD to more than 1000mD, the oil-wetting and water-wetting abilities are also constantly changing, that is, the oil phase index no and the water phase index nw will continue to change with the change in permeability.

[0007] Therefore, in order to solve the problem of assigning relative permeability curves of heterogeneous reservoirs in different permeability distribution ranges, it is urgently necessary to provide a relative permeability curve construction method for heterogeneous reservoirs. Summary of the invention

[0008] In an embodiment of the present invention, a relative permeability curve construction method is provided to solve the technical problem in the prior art that one or more relative permeability curves measured by relative permeability experiments are difficult to cover the permeability distribution range of a heterogeneous reservoir. The method comprises: determining multiple permeability distribution ranges of a heterogeneous reservoir geological model; calculating the irreducible water saturation, residual oil saturation, water phase relative permeability at residual oil saturation, oil phase index and water phase index corresponding to each permeability distribution range according to the regression relationship between irreducible water saturation, residual oil saturation, water phase relative permeability at residual oil saturation, oil phase index and water phase index and permeability; rate, oil phase index and water phase index; according to the bound water saturation and residual oil saturation corresponding to each permeability distribution interval, the water saturation corresponding to each permeability distribution interval is calculated; according to the oil phase index corresponding to each permeability distribution interval, the oil phase relative permeability corresponding to each permeability distribution interval is calculated; according to the water phase index corresponding to each permeability distribution interval, the water phase relative permeability corresponding to each permeability distribution interval is calculated; according to the water saturation, oil phase relative permeability and water phase relative permeability corresponding to each permeability distribution interval, the relative permeability curves of each permeability distribution interval of the heterogeneous reservoir geological model are drawn.

[0009] The embodiment of the present invention also provides a relative permeability curve construction device to solve the technical problem in the prior art that one or several groups of relative permeability curves measured by relative permeability experiments are difficult to cover the permeability distribution range of heterogeneous oil reservoirs. The device includes: a permeability interval determination module, which is used to determine multiple permeability distribution intervals of a heterogeneous oil reservoir geological model; a relative permeability curve characteristic value determination module, which is used to calculate the irreducible water saturation, residual oil saturation, water phase relative permeability at residual oil saturation, oil phase index and water phase index corresponding to each permeability distribution interval according to the regression relationship between irreducible water saturation, residual oil saturation, water phase relative permeability at residual oil saturation, oil phase index and water phase index and permeability; The water saturation calculation module is used to calculate the water saturation corresponding to each permeability distribution interval according to the bound water saturation and residual oil saturation corresponding to each permeability distribution interval; the oil phase relative permeability calculation module is used to calculate the oil phase relative permeability corresponding to each permeability distribution interval according to the oil phase index corresponding to each permeability distribution interval; the water phase relative permeability calculation module is used to calculate the water phase relative permeability corresponding to each permeability distribution interval according to the water phase index corresponding to each permeability distribution interval; the relative permeability curve drawing module is used to draw the relative permeability curve of each permeability distribution interval of the heterogeneous reservoir geological model according to the water saturation, oil phase relative permeability and water phase relative permeability corresponding to each permeability distribution interval.

[0010] A computer device is also provided in an embodiment of the present invention to solve the technical problem in the prior art that one or several groups of relative permeability curves measured by relative permeability experiments are difficult to cover the permeability distribution range of heterogeneous oil reservoirs. The computer device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the above-mentioned relative permeability curve construction method is implemented.

[0011] A computer-readable storage medium is also provided in an embodiment of the present invention to solve the technical problem in the prior art that one or several groups of relative permeability curves measured by relative permeability experiments are difficult to cover the permeability distribution range of heterogeneous oil reservoirs. The computer-readable storage medium stores a computer program for executing the above-mentioned relative permeability curve construction method.

[0012] In the embodiment of the present invention, several groups of relative permeability curves measured by experiments are analyzed to determine the variation law of characteristic parameters and permeability of each relative permeability curve. The water saturation standardization formula, the oil phase relative permeability regression formula, and the water phase relative permeability regression formula are combined to determine the water saturation, oil phase relative permeability, and water phase relative permeability corresponding to each permeability distribution interval of the heterogeneous reservoir geological model, so as to construct the relative permeability curves of each permeability distribution interval of the heterogeneous reservoir geological model. Compared with the technical solution of determining the relative permeability curve by relative permeability experiment in the prior art, the solution provided by the embodiment of the present invention can construct a relative permeability curve that meets the range of the heterogeneous reservoir permeability distribution interval, thereby greatly saving the test time and test cost caused by the relative permeability test experiment. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0014] Figure 1 A schematic diagram of a relative permeability curve drawn using the first relative permeability curve construction method provided in the prior art;

[0015] Figure 2 A schematic diagram of a relative permeability curve drawn using the second relative permeability curve construction method provided in the prior art;

[0016] Figure 3 A flow chart of a relative permeability curve construction method provided in an embodiment of the present invention;

[0017] Figure 4 A schematic diagram of permeability distribution frequency of a heterogeneous reservoir geological model provided in an embodiment of the present invention;

[0018] Figure 5 is a schematic diagram of a permeability distribution interval division result provided in an embodiment of the present invention;

[0019] Figure 6 Schematic diagram of the oil phase index and water phase index regressed from each set of relative permeability curves in an embodiment of the present invention;

[0020] Figure 7 Schematic diagram of the regression relationship between five characteristic values ​​of the relative permeability curve and the permeability in an embodiment of the present invention;

[0021] Figure 8is a schematic diagram of five characteristic values ​​of a relative permeability curve corresponding to each permeability distribution interval of a heterogeneous reservoir calculated in an embodiment of the present invention;

[0022] Fig. 9 is a relative permeability curve of a first permeability distribution range constructed in an embodiment of the present invention;

[0023] Fig.10 is a relative permeability curve of a second permeability distribution range constructed in an embodiment of the present invention;

[0024] Fig.11 It is a relative permeability curve of the third permeability distribution range constructed in the embodiment of the present invention.

[0025] Fig.12 Schematic diagram of a relative permeability curve construction device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0026] To make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. Here, the exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.

[0027] The present invention provides a relative permeability curve construction method. Figure 3 FIG. 1 is a flow chart of a relative permeability curve construction method provided in an embodiment of the present invention. Figure 3 As shown, the method comprises the following steps:

[0028] S301, determining multiple permeability distribution intervals of a heterogeneous reservoir geological model.

[0029] It should be noted that, since the permeability distribution interval of the heterogeneous reservoir is above 0.1 to 1000 mD, it is difficult for the several relative permeability curves measured in the laboratory to cover the permeability distribution interval of the heterogeneous reservoir. In order to solve the problem of constructing relative permeability curves of heterogeneous reservoirs in different permeability intervals, the embodiment of the present invention is based on several groups of experimentally measured relative permeability curves, analyzes the law of change of characteristic parameters of each relative permeability curve with permeability change, combines the water saturation standardization formula, the oil phase relative permeability regression formula and the water phase relative permeability regression formula, determines the water saturation, oil phase relative permeability and water phase relative permeability corresponding to each permeability distribution interval of the heterogeneous reservoir, so as to be able to determine the water saturation, oil phase relative permeability and water phase relative permeability corresponding to each permeability distribution interval of the heterogeneous reservoir, and draw the relative permeability curves of each permeability distribution interval of the heterogeneous reservoir to cover the permeability distribution interval range of the heterogeneous reservoir.

[0030] In specific implementation, the permeability distribution frequency of the heterogeneous reservoir geological model can be used to divide a reasonable permeability distribution interval. Figure 4 Shown is the permeability distribution frequency of a heterogeneous reservoir geological model.

[0031] Take a highly heterogeneous reservoir with a permeability distribution range of 0.1 to 1000 mD as an example.

[0032] from Figure 4 It can be seen that the proportion of permeability less than 0.5mD is relatively low, so <0.5mD can be divided into one interval. Since the permeability distribution frequencies of 0.5-1.0mD, 1.0-3.0mD, 3.0-5.0mD, 5.0-10.0mD, 10-30mD, 30-50mD and 50-100mD are relatively large, they are each divided into a separate interval. The remaining 100-300mD, 300-500mD, 500-800mD, and 800-1000mD, although their distribution frequencies are relatively low, the five characteristic values ​​of relative permeability are very different, and the relative permeability curve shapes are also quite different, so they are also divided into a separate interval. The reasonable permeability intervals finally divided are as follows. Figure 5 shown.

[0033] like Figure 5 As shown, the permeability distribution intervals determined in the embodiments of the present invention are: a permeability interval of <0.5mD, a permeability interval of 0.5 to 1.0mD, a permeability interval of 1.0-3.0mD, a permeability interval of 3.0-5.0mD, a permeability interval of 5.0-10mD, a permeability interval of 10-30mD, a permeability interval of 30-50mD, a permeability interval of 50-100mD, a permeability interval of 5.0-10mD, a permeability interval of 10-30mD, a permeability interval of 30-50mD, a permeability interval of 50-100mD, a permeability interval of 100-300mD, a permeability interval of 300-500mD, a permeability interval of 500-800mD, and a permeability interval of 800-1000mD.

[0034] S302, calculating the irreducible water saturation, residual oil saturation, relative permeability of the water phase at the residual oil saturation, oil phase index and water phase index corresponding to each permeability distribution interval according to the regression relationship between the irreducible water saturation, residual oil saturation, relative permeability of the water phase at the residual oil saturation, oil phase index and water phase index and the permeability.

[0035] In one embodiment, the above S303a can be implemented through the following steps: calculating the average permeability corresponding to each permeability distribution interval; calculating the irreducible water saturation, residual oil saturation, water phase relative permeability at residual oil saturation, oil phase index and water phase index corresponding to each permeability distribution interval according to the regression relationship between irreducible water saturation, residual oil saturation, water phase relative permeability at residual oil saturation, oil phase index and water phase index and the permeability, as well as the average permeability corresponding to each permeability distribution interval.

[0036] It should be noted that, before executing the above S302, the method provided in the embodiment of the present invention can also construct the regression relationship between the irreducible water saturation, the residual oil saturation, the water phase relative permeability at the residual oil saturation, the oil phase index, the water phase index and the permeability through the following steps: obtaining multiple groups of relative permeability curves measured experimentally; regressing the oil phase index and the water phase index of each group of relative permeability curves in the form of a power function; and regressing the irreducible water saturation, the residual oil saturation, the water phase relative permeability at the residual oil saturation, the oil phase index and the water phase index and the permeability in the form of a power function according to the oil phase index and the water phase index of each group of relative permeability curves and the irreducible water saturation, the residual oil saturation, the water phase relative permeability at the residual oil saturation measured experimentally.

[0037] Figure 6 The oil phase index and water phase index regressed from each set of relative permeability curves are shown, as Figure 6 As shown, Y = 0.7742X 4.2562 is the regression formula of oil phase relative permeability, 4.2562 is the oil phase index no; Y = 0.7412X 2.5401 is the regression formula of water phase relative permeability, and 2.5401 is the water phase index nw.

[0038] Figure 7 The regression relationship between the five characteristic values ​​of the relative permeability curve (i.e., irreducible water saturation, residual oil saturation, water phase relative permeability at residual oil saturation, oil phase index, and water phase index) and the permeability is shown, as shown in Figure 2. Figure 7 As shown, (a) shows the bound water saturation S wi and the regression relationship of permeability K; (b) shows the residual oil saturation S or The regression relationship between the permeability K and the residual oil saturation K is shown in (c). rw (d) shows the regression relationship between the oil phase index no and the permeability K; (e) shows the regression relationship between the water phase index nw and the permeability K.

[0039] according to Figure 7 The regression relationship shown can be used to calculate Figure 5The corresponding irreducible water saturation, residual oil saturation, water phase relative permeability at residual oil saturation, oil phase index and water phase index for each permeability distribution interval are shown in the figure. The calculation results are shown in Figure 8 shown.

[0040] S303a, calculating the water saturation corresponding to each permeability distribution interval according to the irreducible water saturation and residual oil saturation corresponding to each permeability distribution interval.

[0041] In one embodiment, when the above S303a is implemented, it can be WD Within the value range of , with the preset interval threshold as the step length, the water saturation corresponding to each permeability distribution interval is calculated using the following formula according to the irreducible water saturation and residual oil saturation corresponding to each permeability distribution interval:

[0042]

[0043] Among them, S WD It represents the standardized water saturation, with a value range of 0.0 to 1.0; S w Indicates water saturation; S wi Represents bound water saturation; S or Indicates residual oil saturation.

[0044] S303b, calculating the oil phase relative permeability corresponding to each permeability distribution interval according to the oil phase index corresponding to each permeability distribution interval.

[0045] In one embodiment, when the above S303b is implemented, it can be WD Within the value range of , with the preset interval threshold as the step length, the following oil phase relative permeability regression formula is used to calculate the oil phase relative permeability corresponding to each permeability distribution interval according to the oil phase index corresponding to each permeability distribution interval:

[0046] K ro =K romax ×(1-S WD ) no (2)

[0047] Among them, K ro Represents the relative permeability of the oil phase; K romax It indicates the maximum value of oil phase relative permeability, which takes the value of 1; no indicates oil phase index; S WD It represents the standardized water saturation, and its value range is 0.0 to 1.0.

[0048] S303c, calculating the water phase relative permeability corresponding to each permeability distribution interval according to the water phase index corresponding to each permeability distribution interval.

[0049] In one embodiment, when the above S303c is implemented, in S WD Within the value range of , with the preset interval threshold as the step size, the following water phase relative permeability regression formula is used to calculate the water phase relative permeability corresponding to each permeability distribution interval according to the water phase index corresponding to each permeability distribution interval:

[0050] K rw =K rwmax ×S WD nw (3)

[0051] Among them, K rw Represents the relative permeability of water phase; K rwmax represents the maximum value of water phase relative permeability, which is 1; nw represents water phase index; S WD It represents the standardized water saturation, and its value range is 0.0 to 1.0.

[0052] S304, drawing relative permeability curves of each permeability distribution interval of the heterogeneous reservoir geological model according to the water saturation, oil phase relative permeability and water phase relative permeability corresponding to each permeability distribution interval.

[0053] It should be noted that after determining the water saturation, oil phase relative permeability and water phase relative permeability corresponding to each permeability distribution interval of the heterogeneous oil reservoir geological model, a relative permeability curve can be drawn according to the water saturation, oil phase relative permeability and water phase relative permeability corresponding to each permeability distribution interval of the heterogeneous oil reservoir geological model, so as to obtain the relative permeability curve of each permeability distribution interval of the heterogeneous oil reservoir geological model.

[0054] For example, Figures 9 to 11 The relative permeability curves of various permeability distribution intervals are shown. Fig. 9 is the relative permeability curve with permeability ranges of <0.5mD, 0.5-1.0mD, 1.0-3.0mD, 3.0-5.0mD; Fig.10 It is the relative permeability curve with permeability ranges of 5.0-10mD, 10-30mD, 30-50mD, and 50-100mD; Fig.11 It is a relative permeability curve with permeability ranges of 100-300mD, 300-500mD, 500-800mD, and 800-1000mD.

[0055] like Fig. 9 As shown, icon 1 represents the relative permeability K of the oil phase in the permeability range <0.5mD ro ; Icon 2 represents the relative permeability K of the oil phase in the permeability range of 0.5-1.0 mD ro; Icon 3 represents the relative permeability K of the oil phase in the permeability range of 1.0-3.0mD ro ; Icon 4 represents the relative permeability K of the oil phase in the permeability range of 3.0-5.0mD ro ; Icon 5 indicates the relative permeability K of the water phase in the permeability range <0.5mD rw ; Icon 6 represents the relative permeability K of the water phase in the permeability range of 0.5-1.0mD rw ; Icon 7 shows the relative permeability K of the water phase in the permeability range of 1.0-3.0mD rw ; Icon 8 represents the relative permeability K of the water phase in the permeability range of 3.0-5.0mD rw .

[0056] like Fig.10 As shown, icon 9 represents the relative permeability K of the oil phase in the permeability range of 5.0-10 mD ro ; Icon 10 represents the relative permeability K of the oil phase in the permeability range of 10-30mD ro ; Icon 11 represents the relative permeability K of the oil phase in the permeability range of 30-50mD ro ; Icon 12 represents the relative permeability K of the oil phase in the permeability range of 50-100mD ro ; Icon 13 represents the relative permeability K of the water phase in the permeability range 5.0-10mD rw ; Icon 14 represents the relative permeability K of the water phase in the permeability range of 10-30mD rw ; Icon 15 represents the relative permeability K of the water phase in the permeability range of 30-50mD rw ; Icon 16 represents the relative permeability K of the water phase in the permeability range 50-100mD rw .

[0057] like Fig.11 As shown, icon 17 represents the relative permeability K of the oil phase in the permeability range of 100-300 mD. ro ; Icon 18 represents the relative permeability K of the oil phase in the permeability range of 300-500mD ro ; Icon 19 represents the relative permeability K of the oil phase in the permeability range of 500-800mD ro ; Icon 20 represents the relative permeability K of the oil phase in the permeability range 800-1000mD ro ; Icon 21 represents the relative permeability K of the water phase in the permeability range of 100-300mD rw ; Icon 22 represents the relative permeability K of the water phase in the permeability range of 300-500mD rw ; Icon 23 represents the relative permeability K of the water phase in the permeability range 500-800mD rw ; Icon 24 represents the relative permeability K of the water phase in the permeability range 800-1000mDrw .

[0058] As can be seen from the above, the relative permeability curve construction method provided in the embodiment of the present invention, after determining multiple permeability distribution intervals of the heterogeneous reservoir geological model, calculates the irreducible water saturation, residual oil saturation, water phase relative permeability at residual oil saturation, oil phase index and water phase index corresponding to each permeability distribution interval according to the regression relationship between irreducible water saturation, residual oil saturation, water phase relative permeability at residual oil saturation, oil phase index and water phase index and permeability, and then calculates the water saturation corresponding to each permeability distribution interval according to the irreducible water saturation and residual oil saturation corresponding to each permeability distribution interval, and calculates the oil phase relative permeability and water phase relative permeability corresponding to each permeability distribution interval according to the oil phase index and water phase index corresponding to each permeability distribution interval, and finally draws the relative permeability curves of each permeability distribution interval of the heterogeneous reservoir geological model according to the water saturation, oil phase relative permeability and water phase relative permeability corresponding to each permeability distribution interval.

[0059] Through the relative permeability curve construction method provided in the embodiment of the present invention, the relative permeability curves of each permeability distribution interval of the heterogeneous reservoir geological model can be constructed, thereby accurately reflecting the characteristic change law of the relative permeability curves of different permeability distribution intervals of the heterogeneous reservoir, which is more scientific and in line with customer rules, and greatly saves the test time and test cost caused by relative permeability test experiments.

[0060] The present invention also provides a relative permeability curve construction device, as described in the following embodiments. Since the principle of the device to solve the problem is similar to that of the relative permeability curve construction method, the implementation of the device can refer to the implementation of the relative permeability curve construction method, and the repeated parts will not be repeated.

[0061] Fig.12 Schematic diagram of a relative permeability curve construction device provided in an embodiment of the present invention, such as Fig.12 As shown, the device includes: a permeability interval determination module 121, a relative permeability curve characteristic value determination module 122, a water saturation calculation module 123a, an oil phase relative permeability calculation module 123b, a water phase relative permeability calculation module 123c and a relative permeability curve drawing module 124.

[0062] The permeability interval determination module 121 is used to determine multiple permeability distribution intervals of the heterogeneous reservoir geological model; the relative permeability curve characteristic value determination module 122 is used to calculate the irreducible water saturation, residual oil saturation, water phase relative permeability at residual oil saturation, oil phase index and water phase index corresponding to each permeability distribution interval according to the regression relationship between irreducible water saturation, residual oil saturation, water phase relative permeability at residual oil saturation, oil phase index and water phase index and permeability; the water saturation calculation module 123a is used to calculate each permeability distribution interval according to the irreducible water saturation and residual oil saturation corresponding to each permeability distribution interval. The water saturation corresponding to the permeability distribution interval; the oil phase relative permeability calculation module 123b is used to calculate the oil phase relative permeability corresponding to each permeability distribution interval according to the oil phase index corresponding to each permeability distribution interval; the water phase relative permeability calculation module 123c is used to calculate the water phase relative permeability corresponding to each permeability distribution interval according to the water phase index corresponding to each permeability distribution interval; the relative permeability curve drawing module 124 is used to draw the relative permeability curve of each permeability distribution interval of the heterogeneous reservoir geological model according to the water saturation, oil phase relative permeability and water phase relative permeability corresponding to each permeability distribution interval.

[0063] As can be seen from the above, the relative permeability curve construction device provided in the embodiment of the present invention determines multiple permeability distribution intervals of the heterogeneous reservoir geological model through the permeability interval determination module 121; the irreducible water saturation, residual oil saturation, water phase relative permeability at residual oil saturation, oil phase index and water phase index corresponding to each permeability distribution interval are calculated through the relative permeability curve characteristic value determination module 122 according to the regression relationship between irreducible water saturation, residual oil saturation, water phase relative permeability at residual oil saturation, oil phase index and water phase index and permeability; the water saturation calculation module 123a calculates the irreducible water saturation, residual oil saturation, water phase relative permeability at residual oil saturation, oil phase index and water phase index corresponding to each permeability distribution interval according to the regression relationship between irreducible water saturation, residual oil saturation, water phase relative permeability at residual oil saturation, oil phase index and water phase index respectively; Residual oil saturation, calculate the water saturation corresponding to each permeability distribution interval; calculate the oil phase relative permeability corresponding to each permeability distribution interval according to the oil phase index corresponding to each permeability distribution interval through the oil phase relative permeability calculation module 123b; calculate the water phase relative permeability corresponding to each permeability distribution interval according to the water phase index corresponding to each permeability distribution interval through the water phase relative permeability calculation module 123c; the relative permeability curve drawing module 124 draws the relative permeability curves of each permeability distribution interval of the heterogeneous reservoir geological model according to the water saturation, oil phase relative permeability and water phase relative permeability corresponding to each permeability distribution interval.

[0064] By means of the relative permeability curve construction device provided in the embodiment of the present invention, it is possible to construct relative permeability curves for each permeability distribution interval of a heterogeneous reservoir geological model, thereby accurately reflecting the characteristic variation law of the relative permeability curves for different permeability distribution intervals of a heterogeneous reservoir, which is more scientific and in line with customer rules, and greatly saves the test time and test cost caused by conducting relative permeability test experiments.

[0065] In one embodiment, the relative permeability curve construction device provided in the embodiment of the present invention may further include: an experimental data acquisition module 125, used to acquire multiple groups of relative permeability curves measured experimentally; a data regression analysis module 126, used to regress the oil phase index and the water phase index of each group of relative permeability curves in the form of a power function; and according to the oil phase index and the water phase index of each group of relative permeability curves, and the experimentally measured irreducible water saturation, residual oil saturation, and water phase relative permeability at residual oil saturation, regress the irreducible water saturation, residual oil saturation, water phase relative permeability at residual oil saturation, oil phase index, water phase index, and their respective regression relationship with permeability in the form of a power function.

[0066] In one embodiment, the water saturation calculation module 123a can also be used in S WD Within the range of values, with the preset interval threshold as the step size, the water saturation corresponding to each permeability distribution interval is calculated using the above formula (1) according to the irreducible water saturation and residual oil saturation corresponding to each permeability distribution interval.

[0067] In one embodiment, the oil phase relative permeability calculation module 123b can also be used in S WD Within the value range of , with the preset interval threshold as the step size, the above formula (2) is used according to the oil phase index corresponding to each permeability distribution interval to calculate the oil phase relative permeability corresponding to each permeability distribution interval; the above water phase relative permeability calculation module 123c can also be used to use the above formula (3) according to the water phase index corresponding to each permeability distribution interval to calculate the water phase relative permeability corresponding to each permeability distribution interval.

[0068] In one embodiment, the relative permeability curve characteristic value determination module 122 may also be used to: calculate the average permeability corresponding to each permeability distribution interval; and calculate the irreducible water saturation, residual oil saturation, water phase relative permeability at residual oil saturation, oil phase index, and water phase index corresponding to each permeability distribution interval according to the regression relationship between irreducible water saturation, residual oil saturation, water phase relative permeability at residual oil saturation, oil phase index, and water phase index, respectively, and the average permeability corresponding to each permeability distribution interval.

[0069] Based on the same inventive concept, a computer device is also provided in an embodiment of the present invention to solve the technical problem in the prior art that one or several groups of relative permeability curves measured by relative permeability experiments are difficult to cover the permeability distribution range of heterogeneous oil reservoirs. The computer device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the above-mentioned relative permeability curve construction method is implemented.

[0070] Based on the same inventive concept, a computer-readable storage medium is also provided in an embodiment of the present invention to solve the technical problem in the prior art that one or several groups of relative permeability curves measured by relative permeability experiments are difficult to cover the permeability distribution range of heterogeneous oil reservoirs. The computer-readable storage medium stores a computer program for executing the above-mentioned relative permeability curve construction method.

[0071] The embodiment of the present invention provides a relative permeability curve construction method, device, computer equipment and computer-readable storage medium. By analyzing several groups of relative permeability curves measured by experiments, the characteristic parameters of each relative permeability curve and the variation law of permeability are determined. In combination with the water saturation standardization formula, the oil phase relative permeability regression formula and the water phase relative permeability regression formula, the water saturation, oil phase relative permeability and water phase relative permeability corresponding to each permeability distribution interval of the heterogeneous reservoir geological model are determined to construct the relative permeability curves of each permeability distribution interval of the heterogeneous reservoir geological model. Compared with the technical solution of determining the relative permeability curve by relative permeability experiment in the prior art, the solution provided by the embodiment of the present invention can construct a relative permeability curve that meets the range of the permeability distribution interval of the heterogeneous reservoir, thereby greatly saving the test time and test cost caused by the relative permeability test experiment.

[0072] Through the embodiments of the present invention, the following technical effects can be achieved but are not limited to: 1. The number of relative permeability experiments required for constructing a relative permeability curve is reduced, thus saving test time and test costs. To implement the embodiments of the present invention, it is only necessary to take several samples with representative permeabilities to conduct relative permeability experiments; 2. The characteristic change law of the relative permeability curve in different permeability intervals can be accurately reflected, which is more scientific and more in line with objective laws; 3. The extremely large permeability distribution range of a strongly heterogeneous oil reservoir can be covered; 4. The relative permeability curve constructed by the embodiments of the present invention can be directly used as an important parameter for numerical simulation.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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 The steps for the functions specified in one or more boxes.

[0077] 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 relative permeability curve construction method, characterized in that: include: Determine multiple permeability distribution intervals for heterogeneous reservoir geological models; According to the regression relationship between irreducible water saturation, residual oil saturation, water phase relative permeability at residual oil saturation, oil phase index and water phase index and permeability, the irreducible water saturation, residual oil saturation, water phase relative permeability at residual oil saturation, oil phase index and water phase index corresponding to each permeability distribution interval are calculated; According to the bound water saturation and residual oil saturation corresponding to each permeability distribution interval, the water saturation corresponding to each permeability distribution interval is calculated; according to the oil phase index corresponding to each permeability distribution interval, the oil phase relative permeability corresponding to each permeability distribution interval is calculated; according to the water phase index corresponding to each permeability distribution interval, the water phase relative permeability corresponding to each permeability distribution interval is calculated; According to the water saturation, oil phase relative permeability and water phase relative permeability corresponding to each permeability distribution interval, the relative permeability curve of each permeability distribution interval of the heterogeneous reservoir geological model is drawn; According to the irreducible water saturation and residual oil saturation corresponding to each permeability distribution interval, the water saturation corresponding to each permeability distribution interval is calculated, including: In S WD Within the value range of , with the preset interval threshold as the step length, the water saturation corresponding to each permeability distribution interval is calculated using the following formula according to the irreducible water saturation and residual oil saturation corresponding to each permeability distribution interval: Among them, S WD Indicates the standardized water saturation, with a value range of 0.0 to 1.0; S w Indicates water saturation; S wi Represents bound water saturation; S or Indicates residual oil saturation.

2. The method according to claim 1, characterized in that The method further comprises: Obtain multiple sets of relative permeability curves measured experimentally; The oil phase index and water phase index of each set of relative permeability curves are regressed in the form of power function; According to the oil phase index and water phase index of each set of relative permeability curves, as well as the experimentally measured irreducible water saturation, residual oil saturation, and water phase relative permeability at residual oil saturation, the regression equations of irreducible water saturation, residual oil saturation, water phase relative permeability at residual oil saturation, oil phase index, water phase index and permeability were regressed in the form of power functions.

3. The method according to claim 1, characterized in that According to the oil phase index corresponding to each permeability distribution interval, the oil phase relative permeability corresponding to each permeability distribution interval is calculated, including: WD Within the value range of , with the preset interval threshold as the step length, the following oil phase relative permeability regression formula is used to calculate the oil phase relative permeability corresponding to each permeability distribution interval according to the oil phase index corresponding to each permeability distribution interval: K ro =K romax ×(1-S WD ) no ; According to the water phase index corresponding to each permeability distribution interval, the water phase relative permeability corresponding to each permeability distribution interval is calculated, including: WD Within the value range of , with the preset interval threshold as the step size, the following water phase relative permeability regression formula is used to calculate the water phase relative permeability corresponding to each permeability distribution interval according to the water phase index corresponding to each permeability distribution interval: K rw =K rwmax ×S WD nw ; Among them, K ro Represents the relative permeability of the oil phase; K romax Represents the maximum value of oil phase relative permeability, which is 1; K rw Represents the relative permeability of water phase; K rwmax It indicates the maximum value of water phase relative permeability, which takes the value of 1; no indicates oil phase index; nw indicates water phase index; S WD Represents the standardized water saturation, ranging from 0.0 to 1.

0.

4. The method according to claim 1, characterized in that According to the regression relationship between irreducible water saturation, residual oil saturation, water phase relative permeability at residual oil saturation, oil phase index and water phase index and permeability, the irreducible water saturation, residual oil saturation, water phase relative permeability at residual oil saturation, oil phase index and water phase index corresponding to each permeability distribution interval are calculated, including: Calculate the average permeability corresponding to each permeability distribution interval; According to the regression equations of irreducible water saturation, residual oil saturation, relative permeability of water phase at residual oil saturation, oil phase index and water phase index with permeability, as well as the average permeability corresponding to each permeability distribution interval, the irreducible water saturation, residual oil saturation, relative permeability of water phase at residual oil saturation, oil phase index and water phase index corresponding to each permeability distribution interval are calculated.

5. A relative permeability curve construction device, characterized in that: include: A permeability interval determination module is used to determine multiple permeability distribution intervals of a heterogeneous reservoir geological model; A relative permeability curve characteristic value determination module is used to calculate the irreducible water saturation, residual oil saturation, water phase relative permeability at residual oil saturation, oil phase index and water phase index corresponding to each permeability distribution interval according to the regression relationship between irreducible water saturation, residual oil saturation, water phase relative permeability at residual oil saturation, oil phase index and water phase index and permeability; A water saturation calculation module is used to calculate the water saturation corresponding to each permeability distribution interval according to the irreducible water saturation and residual oil saturation corresponding to each permeability distribution interval; An oil phase relative permeability calculation module is used to calculate the oil phase relative permeability corresponding to each permeability distribution interval according to the oil phase index corresponding to each permeability distribution interval; A water phase relative permeability calculation module, used to calculate the water phase relative permeability corresponding to each permeability distribution interval according to the water phase index corresponding to each permeability distribution interval; A relative permeability curve drawing module is used to draw relative permeability curves of each permeability distribution interval of a heterogeneous reservoir geological model according to the water saturation, oil phase relative permeability and water phase relative permeability corresponding to each permeability distribution interval; The water saturation calculation module is also used to calculate the water saturation in S WD Within the value range of , with the preset interval threshold as the step length, the water saturation corresponding to each permeability distribution interval is calculated using the following formula according to the irreducible water saturation and residual oil saturation corresponding to each permeability distribution interval: Among them, S WD Indicates the standardized water saturation, with a value range of 0.0 to 1.0; S w Indicates water saturation; S wi Represents bound water saturation; S or Indicates residual oil saturation.

6. The device according to claim 5, characterized in that The device also includes: An experimental data acquisition module is used to obtain multiple sets of relative permeability curves measured experimentally; The data regression analysis module is used to regress the oil phase index and water phase index of each set of relative permeability curves in the form of a power function; and based on the oil phase index and water phase index of each set of relative permeability curves, as well as the experimentally measured irreducible water saturation, residual oil saturation, and water phase relative permeability at residual oil saturation, the regression relationship between the irreducible water saturation, the residual oil saturation, the water phase relative permeability at residual oil saturation, the oil phase index, the water phase index, and the permeability is regressed in the form of a power function.

7. The device according to claim 5, characterized in that The oil phase relative permeability calculation module is also used to calculate the oil phase relative permeability in S WD Within the value range of , with the preset interval threshold as the step length, the following oil phase relative permeability regression formula is used to calculate the oil phase relative permeability corresponding to each permeability distribution interval according to the oil phase index corresponding to each permeability distribution interval: K ro =K romax ×(1-S WD ) no ; The water phase relative permeability calculation module is also used to calculate the water phase relative permeability corresponding to each permeability distribution interval according to the water phase index corresponding to each permeability distribution interval using the following water phase relative permeability regression formula: K rw =K rwmax ×S WD nw ; Among them, K ro Represents the relative permeability of the oil phase; K romax Represents the maximum value of oil phase relative permeability, which is 1; K rw Represents the relative permeability of water phase; K rwmax It indicates the maximum value of water phase relative permeability, which takes the value of 1; no indicates oil phase index; nw indicates water phase index; S WD Represents the standardized water saturation, ranging from 0.0 to 1.

0.

8. The device according to claim 5, characterized in that The relative permeability curve characteristic value determination module is also used for: Calculate the average permeability corresponding to each permeability distribution interval; According to the regression equations of irreducible water saturation, residual oil saturation, relative permeability of water phase at residual oil saturation, oil phase index and water phase index with permeability, as well as the average permeability corresponding to each permeability distribution interval, the irreducible water saturation, residual oil saturation, relative permeability of water phase at residual oil saturation, oil phase index and water phase index corresponding to each permeability distribution interval are calculated.

9. 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 relative permeability curve construction method according to any one of claims 1 to 4 is implemented.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the relative permeability curve construction method according to any one of claims 1 to 4 is implemented.

Images