CN109281664B

CN109281664B - Method and device for predicting oil production of horizontal well

Info

Publication number: CN109281664B
Application number: CN201811129798.4A
Authority: CN
Inventors: 何书梅; 魏朋朋; 马子麟; 刘璐; 程立; 张艳君; 刘川
Original assignee: Petrochina Co Ltd
Current assignee: Petrochina Co Ltd
Priority date: 2018-09-27
Filing date: 2018-09-27
Publication date: 2021-11-02
Anticipated expiration: 2038-09-27
Also published as: CN109281664A

Abstract

The disclosure relates to a method and a device for predicting oil production of a horizontal well, and relates to the field of oil exploitation. The method comprises the following steps: after determining the horizontal length of a rectangular part in a driving range of a horizontal well to be predicted, the pressure difference between the boundary of the driving range and the horizontal well, the oil drainage radius, the shaft radius of the horizontal well, the distance between the horizontal well and the lower boundary of the driving range, the permeability of an oil layer where the horizontal well is located, the viscosity of the oil layer, the volume coefficient of the oil layer and the thickness of the oil layer, a first oil production amount corresponding to the rectangular part in the rectangular range and a second oil production amount corresponding to two end parts can be determined; and then after the sweep coefficient of the oil layer is determined, determining a third oil yield corresponding to the horizontal well according to the first oil yield of the rectangular part, the second oil yields of the two end parts and the sweep coefficient of the oil layer, so that the accuracy of predicting the oil yield of the horizontal well is improved.

Description

Method and device for predicting oil production of horizontal well

Technical Field

The disclosure relates to the field of oil exploitation, in particular to a method and a device for predicting yield of a horizontal well.

Background

A horizontal well is a well in which a well bore is drilled in a horizontal direction in a certain length in an oil reservoir in oil production. The prediction of the oil production of the horizontal well is an important research content in the oil reservoir engineering of the horizontal well and is also an important basis for making a reasonable working system of the horizontal well, predicting the production dynamics of the horizontal well and determining the development mode of the horizontal well. Therefore, the method has important theoretical and practical significance for predicting the oil production of the horizontal well.

When producing oil through a horizontal well, oil is generally produced in the drive range of the horizontal well, which is the range in which the horizontal well can produce oil. At present, the driving range of the horizontal well is considered to be only the oil production in the rectangular part, so the oil production of the horizontal well is generally predicted through the rectangular part.

However, in practice, the horizontal well driving range is not only the rectangular portion in which oil is produced, and therefore, the prediction result of predicting the horizontal well oil production by the above method is not accurate.

Disclosure of Invention

The disclosure provides a method and a device for predicting oil production of a horizontal well. The problem that the prediction result for predicting the oil production of the horizontal well is inaccurate can be solved.

In a first aspect, a method for predicting oil production of a horizontal well is provided, which includes:

determining the horizontal length of a rectangular part in a driving range of a horizontal well to be predicted, the pressure difference between the boundary of the driving range and the horizontal well, the oil drainage radius, the wellbore radius of the horizontal well and the distance between the horizontal well and the lower boundary of the driving range, wherein the driving range comprises the rectangular part and two end parts;

determining the permeability of an oil layer where the horizontal well is located, the viscosity of the oil layer, the volume coefficient of the oil layer and the thickness of the oil layer;

determining a first oil production amount corresponding to the rectangular part according to the horizontal length, the pressure difference, the oil drainage radius, the shaft radius, the distance between the horizontal well and the lower boundary of the driving range, the permeability of the oil layer, the viscosity of the oil layer, the volume coefficient of the oil layer and the thickness of the oil layer;

determining second oil production corresponding to the two end parts according to the pressure difference, the oil drainage radius, the shaft radius, the permeability of the oil layer, the viscosity of the oil layer, the volume coefficient of the oil layer and the thickness of the oil layer;

determining a permeability variation coefficient and a mobility ratio of the horizontal well, and determining a sweep coefficient of the oil layer according to the permeability variation coefficient and the mobility ratio, wherein the sweep coefficient is used for describing the influence degree of the heterogeneity of the oil layer on the oil production of the horizontal well, and the sweep coefficient is in direct proportion to the influence degree;

and determining a third oil production amount corresponding to the horizontal well according to the first oil production amount, the second oil production amount and the sweep coefficient.

In one possible implementation, the determining, according to the horizontal length, the pressure difference, the drainage radius, the wellbore radius, the distance between the horizontal well and the lower boundary of the driving range, the permeability of the oil layer, the viscosity of the oil layer, the volume coefficient of the oil layer, and the thickness of the oil layer, a first oil production amount corresponding to the rectangular portion includes:

determining the first oil production according to the horizontal length, the pressure difference, the oil drainage radius, the shaft radius, the distance between the horizontal well and the lower boundary of the driving range, the permeability of the oil layer, the viscosity of the oil layer, the volume coefficient of the oil layer and the thickness of the oil layer by a first formula:

the formula I is as follows:

wherein, Q is₁For the first oil production, L is the horizontal length, Δ P is the pressure differential, r_eIs the drainage radius, r_wIs the wellbore radius, the z_wIs the distance between the horizontal well and the lower boundary of the driving range, K is the permeability of the oil layer, and mu is₀Is the viscosity of the oil layer, B is the volume coefficient of the oil layer, h is the thickness of the oil layer, ch is a hyperbolic cosine function, and cos isHyperbolic cosine function, and ln is logarithmic function.

In one possible implementation manner, the determining, according to the pressure difference, the drainage radius, the wellbore radius, the permeability of the oil layer, the viscosity of the oil layer, the volume factor of the oil layer, and the thickness of the oil layer, the second oil production amounts corresponding to the two end portions includes:

and determining the second oil production according to the pressure difference, the oil drainage radius, the well bore radius, the permeability of the oil layer, the viscosity of the oil layer, the volume coefficient of the oil layer and the thickness of the oil layer by the following formula II:

the formula II is as follows:

wherein, Q is₂For the second oil production, Δ P is the pressure difference, r_eIs the drainage radius, r_wIs the wellbore radius, the K is the permeability of the reservoir, the μ₀And B is the viscosity of the oil layer, B is the volume coefficient of the oil layer, h is the thickness of the oil layer, and ln is a logarithmic function.

In one possible implementation, the determining the sweep efficiency of the reservoir according to the permeability coefficient of variation and the mobility ratio includes:

determining the sweep coefficient according to the permeability coefficient of variation and the fluidity ratio by the following formula three:

the formula III is as follows:

wherein C is the sweep coefficient, γ is the permeability coefficient of variation, and M is the fluidity ratio.

In a possible implementation manner, the determining a third oil production amount corresponding to the horizontal well according to the first oil production amount, the second oil production amount, and the sweep coefficient includes:

determining the sum of the first oil production and the second oil production to obtain a fourth oil production;

and determining the product of the fourth oil production and the sweep coefficient to obtain the third oil production.

In a second aspect, there is provided a device for predicting oil production of a horizontal well, the device comprising:

the horizontal well driving range prediction method comprises the steps of determining the horizontal length of a rectangular part in a driving range of a horizontal well to be predicted, the pressure difference between the boundary of the driving range and the horizontal well, the oil drainage radius, the shaft radius of the horizontal well and the distance between the horizontal well and the lower boundary of the driving range, wherein the driving range comprises the rectangular part and two end parts;

the second determination module is used for determining the permeability of an oil layer where the horizontal well is located, the viscosity of the oil layer, the volume coefficient of the oil layer and the thickness of the oil layer;

a third determining module, configured to determine, according to the horizontal length, the pressure difference, the oil drainage radius, the wellbore radius, a distance between the horizontal well and a lower boundary of the driving range, a permeability of the oil layer, a viscosity of the oil layer, a volume coefficient of the oil layer, and a thickness of the oil layer, a first oil production amount corresponding to the rectangular portion;

a fourth determining module, configured to determine, according to the pressure difference, the oil drainage radius, the wellbore radius, the permeability of the oil layer, the viscosity of the oil layer, a volume coefficient of the oil layer, and the thickness of the oil layer, second oil production amounts corresponding to the two end portions;

the fifth determining module is used for determining a permeability variation coefficient and a mobility ratio of the horizontal well, and determining a sweep coefficient of the oil layer according to the permeability variation coefficient and the mobility ratio, wherein the sweep coefficient is used for describing the influence degree of the heterogeneity of the oil layer on the oil production of the horizontal well, and the sweep coefficient is in direct proportion to the influence degree;

and the sixth determining module is used for determining a third oil production amount corresponding to the horizontal well according to the first oil production amount, the second oil production amount and the sweep coefficient.

In one possible implementation manner, the third determining module includes:

a first determining submodule, configured to determine the first oil production according to the horizontal length, the pressure difference, the oil drainage radius, the wellbore radius, a distance between the horizontal well and a lower boundary of the driving range, a permeability of the oil layer, a viscosity of the oil layer, a volume coefficient of the oil layer, and a thickness of the oil layer, according to a first formula:

the formula I is as follows:

wherein, Q is₁For the first oil production, L is the horizontal length, Δ P is the pressure differential, r_eIs the drainage radius, r_wIs the wellbore radius, the z_wIs the distance between the horizontal well and the lower boundary of the driving range, K is the permeability of the oil layer, and mu is₀The viscosity of the oil layer, the volume coefficient of the oil layer, the thickness of the oil layer, the hyperbolic cosine function and the logarithmic function are sequentially selected from the group consisting of ch, cos and ln.

In one possible implementation manner, the fourth determining module includes:

a second determining submodule, configured to determine the second oil production according to the pressure difference, the drainage radius, the wellbore radius, the permeability of the oil layer, the viscosity of the oil layer, the volume coefficient of the oil layer, and the thickness of the oil layer by using a second formula:

the formula II is as follows:

wherein, Q is₂For the second oil production, Δ P is the pressure difference, r_eIs that it isRadius of drainage, r_wIs the wellbore radius, the K is the permeability of the reservoir, the μ₀And B is the viscosity of the oil layer, B is the volume coefficient of the oil layer, h is the thickness of the oil layer, and ln is a logarithmic function.

In one possible implementation manner, the fifth determining module includes:

a third determining submodule, configured to determine the sweep coefficient according to the permeability coefficient of variation and the fluidity ratio by using a third formula:

the formula III is as follows:

In one possible implementation manner, the sixth determining module includes:

the fourth determining submodule is used for determining the sum of the first oil production and the second oil production to obtain a fourth oil production;

and the fifth determining submodule is used for determining the product of the fourth oil production and the sweep coefficient to obtain the third oil production.

In a third aspect, there is provided a device for predicting oil production of a horizontal well, the device comprising:

a processor;

a memory for storing processor-executable instructions;

wherein the processor is configured to perform the steps of any of the methods of the first aspect described above.

In a fourth aspect, a computer-readable storage medium is provided, having instructions stored thereon, which when executed by a processor, implement the steps of any of the methods of the first aspect described above.

In a fifth aspect, there is provided a computer program product comprising instructions which, when run on a computer, cause the computer to perform the steps of the method of any of the first aspects above.

The technical scheme provided by the embodiment of the disclosure at least has the following beneficial effects:

in the embodiment of the disclosure, after determining the horizontal length of a rectangular part in a driving range of a horizontal well to be predicted, the pressure difference between a driving range boundary and the horizontal well, the drainage radius, the wellbore radius of the horizontal well, the distance between the horizontal well and a lower boundary of the driving range, the permeability of an oil layer where the horizontal well is located, the viscosity of the oil layer, the volume coefficient of the oil layer and the thickness of the oil layer, a first oil production amount corresponding to the rectangular part in the rectangular range and a second oil production amount corresponding to two end parts can be determined; and then after the sweep coefficient of the oil layer is determined, determining a third oil yield corresponding to the horizontal well according to the first oil yield of the rectangular part, the second oil yields of the two end parts and the sweep coefficient of the oil layer, so that the accuracy of predicting the oil yield of the horizontal well is improved.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.

Fig. 1 is a schematic diagram showing that the flow field strength of both end portions is lower than that of a rectangular portion in the driving range of a horizontal well.

FIG. 2 is a flow chart illustrating a method for predicting oil production from a horizontal well in accordance with an exemplary embodiment.

FIG. 3 is a flow chart illustrating a method for predicting horizontal well oil production according to an exemplary embodiment.

FIG. 4 is a schematic illustrating a horizontal well drive range according to an exemplary embodiment.

FIG. 5 is a schematic illustration of two end portions of a horizontal well drive range, according to an exemplary embodiment.

FIG. 6 is a block diagram illustrating a horizontal well oil production prediction device according to an exemplary embodiment.

Fig. 7 is a block diagram illustrating a structure of a terminal according to an exemplary embodiment.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present invention.

Before explaining the embodiments of the present disclosure in detail, an application scenario of the embodiments of the present disclosure is introduced:

horizontal wells have been widely used in oil production to increase the exposed area of hydrocarbon reservoirs and thereby improve the efficiency of oil production. The well inclination angle of the horizontal well reaches or approaches 90 degrees, and the well body drills a certain length along the horizontal direction, so that the horizontal well is suitable for a thin oil layer or a fractured oil layer. Therefore, the prediction of the oil production of the horizontal well is the subject of the prior research by researchers.

Since the 40 th century, scholars at home and abroad make a great deal of research on the prediction of the oil production of the horizontal well, a series of methods for predicting the oil production of the horizontal well are provided, and the common calculation methods for predicting the oil production of the horizontal well are Borisov (Borisov) in Soviet Union, Giger (King grid) in France, Joshi (Joshi) in the United states, Chengyuan thousand and the like in China. The method defines the driving range of the horizontal well as an ellipse, and is derived by using the physical concepts of the driving radius, the oil production and the like of a quasi-circle with the same value as the area of the ellipse. These methods assume that the flow field of the horizontal well is uniformly distributed over the drive range. Practical research results show that the driving range of the horizontal well is formed by a rectangular part and two semicircles at two end parts, the flow field intensity of the two end parts is obviously lower than that of the rectangular part, as shown in fig. 1, fig. 1 is a schematic diagram that the flow field intensity of the two end parts is lower than that of the rectangular part in the driving range of the horizontal well. Therefore, the oil yield of the horizontal well predicted according to the four methods is obviously higher than the actual oil yield of the horizontal well.

In 1996, the method for calculating the oil production of the horizontal well is deduced by the sino-macro in China by using a mirror image reflection principle, and only the yield of a rectangular part in a driving range of the horizontal well is considered in the method from the viewpoint of flow field distribution, but the yields of two end parts of the horizontal well are not considered. Therefore, the calculated horizontal well oil production is obviously lower than the actual horizontal well oil production. And the sino-macron formula is only suitable for the condition that the horizontal well is positioned in the middle of an oil layer, and the application range is narrow.

Fig. 2 is a flow chart illustrating a method for predicting oil production of a horizontal well according to an exemplary embodiment, as shown in fig. 2, applied to a terminal, including the following steps.

In step 201, the horizontal length of a rectangular part in a driving range of a horizontal well to be predicted, the pressure difference between the boundary of the driving range and the horizontal well, the drainage radius, the wellbore radius of the horizontal well and the distance between the horizontal well and the lower boundary of the driving range are determined, and the driving range comprises the rectangular part and two end parts.

In step 202, the permeability of the oil layer in which the horizontal well is located, the viscosity of the oil layer, the volume factor of the oil layer, and the thickness of the oil layer are determined.

In step 203, a first oil production amount corresponding to the rectangular portion is determined according to the horizontal length, the pressure difference, the oil drainage radius, the wellbore radius, a distance between the horizontal well and the lower boundary of the driving range, a permeability of the oil layer, a viscosity of the oil layer, a volume coefficient of the oil layer, and a thickness of the oil layer.

In step 204, second oil production corresponding to the two end portions is determined according to the pressure difference, the drainage radius, the wellbore radius, the permeability of the oil layer, the viscosity of the oil layer, the volume coefficient of the oil layer and the thickness of the oil layer.

In step 205, a permeability coefficient of variation and a mobility ratio of the horizontal well are determined, and a sweep coefficient of the oil reservoir is determined according to the permeability coefficient of variation and the mobility ratio, where the sweep coefficient is used to describe an influence degree of heterogeneity of the oil reservoir on oil production of the horizontal well, and the sweep coefficient is proportional to the influence degree.

In step 206, a third oil production amount corresponding to the horizontal well is determined according to the first oil production amount, the second oil production amount and the sweep coefficient.

In one possible implementation, determining a first oil production amount corresponding to the rectangular portion according to the horizontal length, the pressure difference, the drainage radius, the wellbore radius, a distance between the horizontal well and the lower boundary of the driving range, a permeability of the oil layer, a viscosity of the oil layer, a volume coefficient of the oil layer, and a thickness of the oil layer includes:

according to the horizontal length, the pressure difference, the oil drainage radius, the shaft radius, the distance between the horizontal well and the lower boundary of the driving range, the permeability of the oil layer, the viscosity of the oil layer, the volume coefficient of the oil layer and the thickness of the oil layer, the first oil production is determined through the following formula I:

the formula I is as follows:

wherein, the Q₁For the first oil production, L is the horizontal length, Δ P is the pressure difference, r_eIs the radius of the oil drainage, r_wIs the radius of the wellbore, the z_wIs the distance between the horizontal well and the lower boundary of the driving range, K is the permeability of the reservoir, μ₀The viscosity of the oil layer, the B is a volume coefficient of the oil layer, the h is a thickness of the oil layer, the ch is a hyperbolic cosine function, the cos is a hyperbolic cosine function, and the ln is a logarithmic function.

In one possible implementation manner, determining the second oil production amount corresponding to the two end portions according to the pressure difference, the drainage radius, the wellbore radius, the permeability of the oil layer, the viscosity of the oil layer, the volume coefficient of the oil layer, and the thickness of the oil layer includes:

according to the pressure difference, the oil drainage radius, the shaft radius, the permeability of the oil layer, the viscosity of the oil layer, the volume coefficient of the oil layer and the thickness of the oil layer, determining the second oil production through the following formula II:

the formula II is as follows:

wherein, the Q₂For the second oil production, the Δ P is the pressure difference, r_eIs the radius of the oil drainage, r_wIs the wellbore radius, K is the permeability of the reservoir, μ₀The viscosity of the oil layer, the B is the volume factor of the oil layer, the h is the thickness of the oil layer, and the ln is a logarithmic function.

In one possible implementation, determining the sweep coefficient of the reservoir based on the permeability coefficient of variation and the mobility ratio includes:

according to the permeability coefficient of variation and the fluidity ratio, the sweep coefficient is determined by the following formula three:

the formula III is as follows:

In one possible implementation manner, determining a third oil production amount corresponding to the horizontal well according to the first oil production amount, the second oil production amount, and the sweep coefficient includes:

All the above optional technical solutions can be combined arbitrarily to form optional embodiments of the present disclosure, and the embodiments of the present disclosure are not described in detail again.

Fig. 3 is a flowchart illustrating a method for predicting oil production of a horizontal well according to an exemplary embodiment, and the present embodiment will be described with reference to fig. 2. As shown in fig. 3, the method is applied to a terminal and includes the following steps.

In step 301, the terminal determines the horizontal length of a rectangular portion in the driving range of the horizontal well to be predicted, the pressure difference between the driving range boundary and the horizontal well, the drainage radius, the wellbore radius of the horizontal well, and the distance between the horizontal well and the lower boundary of the driving range.

When the terminal determines the horizontal length of the rectangular part in the driving range of the horizontal well to be predicted, the pressure difference between the boundary of the driving range and the horizontal well, the oil drainage radius, the well casing radius of the horizontal well and the distance between the horizontal well and the lower boundary of the driving range, in a possible implementation mode, the terminal can receive the horizontal length of the rectangular part, the pressure difference between the boundary of the driving range and the horizontal well, the oil drainage radius, the well casing radius of the horizontal well and the distance between the horizontal well and the lower boundary of the driving range, which are input by a user. In another possible implementation manner, the configuration information of the horizontal well may include a horizontal length of the rectangular portion, a pressure difference between the driving range boundary and the horizontal well, an oil drainage radius, a wellbore radius of the horizontal well, and a distance between the horizontal well and the driving range lower boundary, and therefore, the terminal may further obtain the parameters from the configuration information of the horizontal well.

In the embodiment of the present disclosure, the driving range of the horizontal well to be predicted includes two sections, i.e., a rectangular section and two end sections. Fig. 4 is a schematic view of the driving range of a horizontal well, as shown in fig. 4, in a direction perpendicular to the ground and parallel to the reservoir profile. As shown in fig. 5, fig. 5 is a schematic view of both end portions in the driving range of the horizontal well, and the direction of the figure is a direction parallel to the cross section of the horizontal well.

It should be noted that each of the two end portions in the driving range is formed in a hemispherical shape, and therefore, when the two end portions are viewed in a direction perpendicular to the ground and parallel to the section plane of the oil layer in fig. 4, the two end portions are formed in a semicircular shape. In fig. 5, both ends in the driving range are joined together to form a single sphere, and the observation is made in a direction parallel to the cross section of the horizontal well.

The horizontal length of the rectangular part is the same as that of the horizontal well, so that the horizontal length of the rectangular part can be obtained by measuring the length of the horizontal well, and the horizontal length of the rectangular part can be 314.1 m. The horizontal length of the rectangular portion is noted in fig. 4. The pressure difference between the boundary of the driving range and the horizontal well is the pressure value at the boundary of the driving range minus the pressure value at the position of the horizontal well, and the pressure difference can be 3 MPa. The oil drainage radius refers to the radius of oil produced by the horizontal well in the horizontal direction parallel to the ground, and can be 200m, and is marked in fig. 5. The radius of a shaft of the horizontal well is the section radius of the horizontal well, the radius of the shaft can be 0.065m, and the shaft radius is marked in fig. 5.

In the embodiment of the present disclosure, since the upper and lower boundaries of the rectangular portion in the driving range of the horizontal well coincide with the upper and lower boundaries of the oil reservoir in which the horizontal well is located, the distance between the horizontal well and the lower boundary of the driving range is also the distance between the horizontal well and the lower boundary of the oil reservoir, and the distance between the horizontal well and the lower boundary of the driving range may be 7 m.

In step 302, the terminal determines the permeability of the formation in which the horizontal well is located, the viscosity of the formation, the volume factor of the formation, and the thickness of the formation.

Because the oil layer where the horizontal well is located can influence the oil production of horizontal well, therefore, some parameters of the oil layer where the horizontal well is located can also be determined through the terminal in the embodiment of the disclosure, and the parameters include the permeability of the oil layer, the viscosity of the oil layer, the volume coefficient of the oil layer and the thickness of the oil layer. Wherein the oil layer has a permeability of 600 × 10^-3μm²The viscosity of the oil layer may be 28mPa · s, the volume factor of the oil layer may be 1.083, and the thickness of the oil layer may be 10 m.

When the terminal determines the permeability of the oil layer where the horizontal well is located, the viscosity of the oil layer, the volume coefficient of the oil layer and the thickness of the oil layer, in a possible implementation mode, the terminal can receive the permeability of the oil layer where the horizontal well is located, the viscosity of the oil layer, the volume coefficient of the oil layer and the thickness of the oil layer, which are input by a user. In another possible implementation manner, the configuration information of the horizontal well may include permeability of an oil layer where the horizontal well is located, viscosity of the oil layer, a volume coefficient of the oil layer, and thickness of the oil layer, and therefore the terminal may further obtain the parameters from the configuration information of the horizontal well.

It should be noted that, because the upper and lower boundaries of the rectangular portion in the driving range of the horizontal well coincide with the upper and lower boundaries of the oil layer where the horizontal well is located, the distance between the horizontal well and the lower boundary of the oil layer, which is obtained by subtracting the thickness of the oil layer from the thickness of the oil layer, is the distance between the horizontal well and the upper boundary of the oil layer, that is, the distance between the horizontal well and the upper boundary of the driving range. That is, in the embodiment of the present disclosure, there is both a distance between the horizontal well and the upper boundary of the driving range and a distance between the horizontal well and the lower boundary of the driving range, and the two distances may be the same or different. When the two distances are the same, the horizontal well is positioned in the middle of the oil layer in the oil layer section direction; when the two distances are the same, the horizontal well is in a non-middle position of the oil layer in the section direction of the oil layer. Therefore, the horizontal well in the embodiment of the disclosure can be located at any position of the oil layer in the oil layer section direction, and the application range is wider.

In step 303, the terminal determines a first oil production amount corresponding to the rectangular portion according to the horizontal length, the pressure difference, the oil drainage radius, the wellbore radius, the distance between the horizontal well and the lower boundary of the driving range, the permeability of the oil layer, the viscosity of the oil layer, the volume coefficient of the oil layer, and the thickness of the oil layer.

Since the driving range of the horizontal well includes the rectangular portion, that is, the horizontal well also has oil production in the rectangular portion, the first oil production corresponding to the rectangular portion can be determined according to the parameters in step 301 and step 302, that is, the horizontal length, the pressure difference, the oil drainage radius, the wellbore radius, the distance between the horizontal well and the lower boundary of the driving range, the permeability of the oil layer, the viscosity of the oil layer, the volume coefficient of the oil layer, and the thickness of the oil layer.

In one possible implementation, the terminal may determine the first oil production amount according to a horizontal length, a pressure difference, an oil drainage radius, a wellbore radius, a distance between the horizontal well and a lower boundary of the driving range, a permeability of the oil layer, a viscosity of the oil layer, a volume factor of the oil layer, and a thickness of the oil layer by a first formula:

the formula I is as follows:

wherein Q is₁For the first oil production, L is the horizontal length, Δ P is the pressure differential, r_eIs the radius of oil drainage, r_wIs the radius of the wellbore, z_wIs the distance between the horizontal well and the lower boundary of the driving range, K is the permeability of the reservoir, μ₀The viscosity of the oil layer, B the volume coefficient of the oil layer, h the thickness of the oil layer, ch the hyperbolic cosine function, cos the hyperbolic cosine function and ln the logarithmic function.

It should be noted that, in the determination process of the formula one, a mirror image reflection theory and a potential superposition principle can be applied, and the mirror image reflection theory is a theory for converting the problem of the wells near the boundary of the oil layer into the problem of simultaneous action of multiple wells in an infinite stratum.

In addition, when the horizontal length of the rectangular part is 314.1m, the pressure difference is 3MPa, the oil drainage radius is 200m, the well bore radius is 0.065m, the distance between the horizontal well and the lower boundary of the driving range is 7m, and the oil layer is formedThe permeability can be 600 multiplied by 10^-3μm²When the viscosity of the oil layer is 28mPa · s, the volume coefficient of the oil layer is 1.083 and the thickness of the oil layer is 10m, the first oil yield corresponding to the rectangular part is 154.72m through calculation of the formula I³/d。

In step 304, the terminal determines a second oil production corresponding to the two end portions according to the pressure difference, the drainage radius, the wellbore radius, the permeability of the oil layer, the viscosity of the oil layer, the volume coefficient of the oil layer and the thickness of the oil layer.

Since the driving range of the horizontal well also includes two end parts, that is, the horizontal well also has oil production in the two end parts, the second oil production corresponding to the two end parts can also be determined by the parameters in step 301 and step 302, that is, the pressure difference, the drainage radius, the wellbore radius, the permeability of the oil layer, the viscosity of the oil layer, the volume coefficient of the oil layer, and the thickness of the oil layer.

In one possible implementation, the terminal may determine the second oil production amount according to the pressure difference, the drainage radius, the wellbore radius, the permeability of the oil layer, the viscosity of the oil layer, the volume factor of the oil layer, and the thickness of the oil layer by the following formula two:

the formula II is as follows:

wherein Q is₂For the second oil production, Δ P is the pressure difference, r_eIs the radius of oil drainage, r_wIs the wellbore radius, K is the permeability of the reservoir, μ₀And B is the volume coefficient of the oil layer, h is the thickness of the oil layer, and ln is a logarithmic function.

It should be noted that the flow pattern of the oil in the two end portions is divided into two types, namely, a planar radial flow and a spherical centripetal flow. As shown in fig. 5, a transition boundary exists in the process of flowing oil from the boundary between the two end parts to the center of the horizontal well bore, the oil flows in a planar radial flow mode in the process of flowing from the boundary between the two end parts to the transition boundary, and the oil flows in a spherical centripetal flow mode in the process of flowing from the transition boundary to the center of the horizontal well bore. The distance between the transition boundary and the center of the horizontal well shaft can be called as a transition radius, the transition radius is marked in fig. 5, the transition radius can be 1.5h in the embodiment of the disclosure, and h is the thickness of an oil layer.

The planar radial flow refers to flow on the same plane, for example, a cylindrical cross section is circular, and the form of flow from the boundary of the cross section to the center of the cross section is the planar radial flow. The spherical centripetal flow refers to flow from all directions of the spherical surface to the spherical center, for example, the flow form from the spherical surface to the spherical center in one spherical body is the spherical centripetal flow.

In addition, the potential superposition principle can be applied in the determination process of the formula two. And when the horizontal length of the rectangular part is 314.1m, the pressure difference is 3MPa, the oil drainage radius is 200m, the well bore radius is 0.065m, the distance between the horizontal well and the lower boundary of the driving range is 7m, and the permeability of an oil layer can be 600 multiplied by 10^-3μm²When the viscosity of the oil layer is 28 mPas, the volume coefficient of the oil layer is 1.083 and the thickness of the oil layer is 10m, the second oil yield corresponding to the two end parts is 14.66m³/d。

In step 305, the terminal determines a permeability variation coefficient and a mobility ratio of the horizontal well, and determines a sweep coefficient of an oil layer according to the permeability variation coefficient and the mobility ratio, wherein the sweep coefficient is used for describing the influence degree of the heterogeneity of the oil layer on the oil production of the horizontal well, and the sweep coefficient is in direct proportion to the influence degree.

In practical application, the heterogeneity of the oil reservoir is ubiquitous, and the oil production of the horizontal well can be seriously influenced by the existence of the heterogeneity of the oil reservoir. The longer the horizontal well is, the more obvious the influence of the heterogeneity of the oil layer on the oil production of the horizontal well is. Therefore, the embodiment of the disclosure introduces the sweep coefficient, which is used for describing the influence degree of the heterogeneity of an oil layer on the oil production of the horizontal well; the sweep coefficient is proportional to the influence degree, namely the larger the sweep coefficient is, the larger the influence of the heterogeneity of the oil layer on the oil production of the horizontal well is, the smaller the sweep coefficient is, and the smaller the influence of the heterogeneity of the oil layer on the oil production of the horizontal well is.

In one possible implementation, the present step can be implemented by the following steps (1) to (3), including:

(1): and determining the permeability variation coefficient of the horizontal well by the terminal.

In the first implementation mode, a terminal obtains permeability values of a plurality of sample horizontal wells, an average permeability value is determined according to the permeability value of each sample horizontal well, and the permeability variation coefficient of the horizontal well is determined according to the number of the sample horizontal wells, the permeability value of each sample horizontal well and the average permeability value through the following formula IV.

The formula four is as follows:

wherein, K_iThe permeability value for the ith sample horizontal well,

and n is the number of sample horizontal wells as the average permeability.

In the second implementation mode, the terminal can acquire and store the permeability coefficient of variation of the horizontal well according to the first implementation mode before predicting the oil production of the horizontal well. When the oil production amount of the horizontal well is predicted, the stored permeability variation coefficient of the horizontal well is directly obtained, the permeability variation coefficient of the horizontal well does not need to be repeatedly determined, and the treatment efficiency is improved.

(2): and the terminal determines the mobility ratio of the horizontal well.

The terminal determines the relative permeability of water corresponding to the average water saturation at the back of the oil-water front edge, the relative permeability of oil corresponding to the average water saturation at the front of the oil-water front edge, the viscosity of water in the stratum and the viscosity of an oil layer when the horizontal well meets water; and determining the mobility ratio of the horizontal well according to the relative permeability of water corresponding to the average water saturation at the front edge of the oil water when water is met, the relative permeability of oil corresponding to the average water saturation at the front edge of the oil water, the viscosity of water in the bottom layer and the viscosity of an oil layer by the following formula V.

The formula five is as follows:

wherein, K_rwRelative permeability of water, K, corresponding to the average water saturation after the oil-water front in the event of water breakthrough_r0Relative permeability, μ, of oil corresponding to the average water saturation before the oil-water front_wIs the viscosity of the water in the bottom layer, mu₀The viscosity of the oil layer.

(3): and the terminal determines the sweep coefficient according to the permeability variation coefficient and the fluidity ratio by the following formula III:

the formula III is as follows:

wherein C is the sweep coefficient, gamma is the permeability coefficient of variation, and M is the fluidity ratio.

In step 306, the terminal determines the sum of the first oil production and the second oil production to obtain a fourth oil production.

After determining the first oil production amount and the second oil production amount, the terminal may add the first oil production amount and the second oil production amount to obtain a fourth oil production amount, which is an oil production amount of a horizontal well in a case where the oil layer is homogeneous.

In one possible implementation, the terminal may determine the sum of the first oil production and the second oil production by the following formula six, resulting in a fourth oil production:

formula six: q₄＝Q₁+Q₂

Wherein Q is₄The fourth oil production.

It should be noted that when the rectangular portion corresponds to the first oil production amount of 154.72m³D, the second oil production amount corresponding to the two end portions is 14.66m³At d, the fourth oil production is 169.38m³/d。

Alternatively, step 305 may be performed first and then step 306 may be performed, or step 306 may be performed first and then step 305 may be performed. That is, the permeability coefficient of variation and the mobility ratio of the horizontal well may be determined, the sweep coefficient of the oil layer may be determined according to the permeability coefficient of variation and the mobility ratio, and then the sum of the first oil production amount and the second oil production amount may be determined to obtain the fourth oil production amount; or determining the sum of the first oil production amount and the second oil production amount to obtain a fourth oil production amount, then determining the permeability variation coefficient and the mobility ratio of the horizontal well, and determining the sweep coefficient of the oil layer according to the permeability variation coefficient and the mobility ratio, which is not limited in the embodiment of the disclosure.

In step 307, the terminal determines the product of the fourth oil production and the sweep coefficient to obtain a third oil production.

After determining the sweep coefficient of the oil layer and the fourth oil production amount of the horizontal well under the condition that the oil layer is homogeneous, the fourth oil production amount can be multiplied by the sweep coefficient to obtain a product of the fourth oil production amount and the sweep coefficient, and the product is the third oil production amount corresponding to the horizontal well.

In one possible implementation manner, the terminal may determine the product of the fourth oil production and the sweep coefficient by the following formula seven to obtain the third oil production:

the first oil production amount satisfies:

the formula seven: q₃＝Q₄×C

Wherein Q is₃The third oil production.

In addition, when the fourth oil production is 169.38m³D, when the sweep efficiency is 70.5%, the third oil yield is 119.42m³And d. 119.42m³The horizontal length of the rectangular part is 314.1m, the pressure difference is 3MPa, the oil drainage radius is 200m, the well bore radius is 0.065m, the distance between the horizontal well and the lower boundary of the driving range is 7m, and the permeability of an oil layer can be 600 multiplied by 10^-3μm²The viscosity of the oil layer was 28 mPas, the volume factor of the oil layer was 1.083, and the thickness of the oil layer was 10 m. In actual production, the oil production on the horizontal well to be predicted is 115.32m³And d, therefore, the error of the third oil production of the horizontal well obtained by the method of the embodiment of the disclosure from the actual oil production is 3.55%, and the error is less than 5%.

Fig. 6 is a block diagram illustrating a horizontal well oil production prediction apparatus 600 according to an exemplary embodiment. As shown in fig. 6, the apparatus includes a first determining module 601, a second determining module 602, a third determining module 603, a fourth determining module 604, a fifth determining module 605, and a sixth determining module 606.

A first determining module 601, configured to determine a horizontal length of a rectangular portion in a driving range of a horizontal well to be predicted, a pressure difference between a boundary of the driving range and the horizontal well, a drainage radius, a wellbore radius of the horizontal well, and a distance between the horizontal well and a lower boundary of the driving range, where the driving range includes the rectangular portion and two end portions

A second determining module 602, configured to determine permeability of an oil layer where the horizontal well is located, viscosity of the oil layer, a volume coefficient of the oil layer, and a thickness of the oil layer;

a third determining module 603, configured to determine a first oil production amount corresponding to the rectangular portion according to the horizontal length, the pressure difference, the oil drainage radius, the wellbore radius, a distance between the horizontal well and the lower boundary of the driving range, a permeability of the oil layer, a viscosity of the oil layer, a volume coefficient of the oil layer, and a thickness of the oil layer;

a fourth determining module 604, configured to determine second oil production amounts corresponding to the two end portions according to the pressure difference, the drainage radius, the wellbore radius, the permeability of the oil layer, the viscosity of the oil layer, the volume coefficient of the oil layer, and the thickness of the oil layer;

a fifth determining module 605, configured to determine a permeability variation coefficient and a mobility ratio of the horizontal well, and determine a sweep coefficient of the oil reservoir according to the permeability variation coefficient and the mobility ratio, where the sweep coefficient is used to describe an influence degree of heterogeneity of the oil reservoir on an oil production amount of the horizontal well, and the sweep coefficient is in direct proportion to the influence degree;

a sixth determining module 606, configured to determine a third oil production amount corresponding to the horizontal well according to the first oil production amount, the second oil production amount, and the sweep coefficient.

In one possible implementation, the third determining module 603 includes:

a first determining submodule, configured to determine the first oil production amount according to the horizontal length, the pressure difference, the oil drainage radius, the wellbore radius, a distance between the horizontal well and the lower boundary of the driving range, a permeability of the oil layer, a viscosity of the oil layer, a volume coefficient of the oil layer, and a thickness of the oil layer by using a first formula:

the formula I is as follows:

In one possible implementation, the fourth determining module 604 includes:

the second determining submodule is used for determining the second oil production through the following formula II according to the pressure difference, the oil drainage radius, the shaft radius, the permeability of the oil layer, the viscosity of the oil layer, the volume coefficient of the oil layer and the thickness of the oil layer:

the formula II is as follows:

In one possible implementation, the fifth determining module 605 includes:

the formula III is as follows:

In one possible implementation, the sixth determining module 606 includes:

a fourth determining submodule, configured to determine a sum of the first oil production amount and the second oil production amount to obtain a fourth oil production amount;

With regard to the apparatus in the above-described embodiment, the specific manner in which each module performs the operation has been described in detail in the embodiment related to the method, and will not be elaborated here.

Fig. 7 is a block diagram illustrating a terminal 700 according to an exemplary embodiment of the present invention. The terminal 700 may be: a smartphone, a tablet, a laptop, or a desktop computer. Terminal 700 may also be referred to by other names such as user equipment, portable terminal, laptop terminal, desktop terminal, and so on.

In general, terminal 700 includes: a processor 701 and a memory 702.

The processor 701 may include one or more processing cores, such as a 4-core processor, an 8-core processor, and so on. The processor 701 may be implemented in at least one hardware form of a DSP (Digital Signal Processing), an FPGA (Field-Programmable Gate Array), and a PLA (Programmable Logic Array). The processor 701 may also include a main processor and a coprocessor, where the main processor is a processor for Processing data in an awake state, and is also called a Central Processing Unit (CPU); a coprocessor is a low power processor for processing data in a standby state. In some embodiments, the processor 701 may be integrated with a GPU (Graphics Processing Unit), which is responsible for rendering and drawing the content required to be displayed on the display screen. In some embodiments, the processor 701 may further include an AI (Artificial Intelligence) processor for processing computing operations related to machine learning.

Memory 702 may include one or more computer-readable storage media, which may be non-transitory. Memory 702 may also include high-speed random access memory, as well as non-volatile memory, such as one or more magnetic disk storage devices, flash memory storage devices. In some embodiments, a non-transitory computer readable storage medium in memory 702 is used to store at least one instruction for execution by processor 701 to implement the method for predicting horizontal well oil production provided by the method embodiments herein.

In some embodiments, the terminal 700 may further optionally include: a peripheral interface 703 and at least one peripheral. The processor 701, the memory 702, and the peripheral interface 703 may be connected by buses or signal lines. Various peripheral devices may be connected to peripheral interface 703 via a bus, signal line, or circuit board. Specifically, the peripheral device includes: at least one of radio frequency circuitry 704, touch screen display 705, camera 706, audio circuitry 707, positioning components 708, and power source 709.

The peripheral interface 703 may be used to connect at least one peripheral related to I/O (Input/Output) to the processor 701 and the memory 702. In some embodiments, processor 701, memory 702, and peripheral interface 703 are integrated on the same chip or circuit board; in some other embodiments, any one or two of the processor 701, the memory 702, and the peripheral interface 703 may be implemented on a separate chip or circuit board, which is not limited in this embodiment.

The Radio Frequency circuit 704 is used for receiving and transmitting RF (Radio Frequency) signals, also called electromagnetic signals. The radio frequency circuitry 704 communicates with communication networks and other communication devices via electromagnetic signals. The rf circuit 704 converts an electrical signal into an electromagnetic signal to transmit, or converts a received electromagnetic signal into an electrical signal. Optionally, the radio frequency circuit 704 includes: an antenna system, an RF transceiver, one or more amplifiers, a tuner, an oscillator, a digital signal processor, a codec chipset, a subscriber identity module card, and so forth. The radio frequency circuitry 704 may communicate with other terminals via at least one wireless communication protocol. The wireless communication protocols include, but are not limited to: metropolitan area networks, various generation mobile communication networks (2G, 3G, 4G, and 5G), Wireless local area networks, and/or WiFi (Wireless Fidelity) networks. In some embodiments, the radio frequency circuit 704 may also include NFC (Near Field Communication) related circuits, which are not limited in this application.

The display screen 705 is used to display a UI (User Interface). The UI may include graphics, text, icons, video, and any combination thereof. When the display screen 705 is a touch display screen, the display screen 705 also has the ability to capture touch signals on or over the surface of the display screen 705. The touch signal may be input to the processor 701 as a control signal for processing. At this point, the display 705 may also be used to provide virtual buttons and/or a virtual keyboard, also referred to as soft buttons and/or a soft keyboard. In some embodiments, the display 705 may be one, providing the front panel of the terminal 700; in other embodiments, the display 705 can be at least two, respectively disposed on different surfaces of the terminal 700 or in a folded design; in still other embodiments, the display 705 may be a flexible display disposed on a curved surface or on a folded surface of the terminal 700. Even more, the display 705 may be arranged in a non-rectangular irregular pattern, i.e. a shaped screen. The Display 705 may be made of LCD (Liquid Crystal Display), OLED (Organic Light-Emitting Diode), or the like.

The camera assembly 706 is used to capture images or video. Optionally, camera assembly 706 includes a front camera and a rear camera. Generally, a front camera is disposed at a front panel of the terminal, and a rear camera is disposed at a rear surface of the terminal. In some embodiments, the number of the rear cameras is at least two, and each rear camera is any one of a main camera, a depth-of-field camera, a wide-angle camera and a telephoto camera, so that the main camera and the depth-of-field camera are fused to realize a background blurring function, and the main camera and the wide-angle camera are fused to realize panoramic shooting and VR (Virtual Reality) shooting functions or other fusion shooting functions. In some embodiments, camera assembly 706 may also include a flash. The flash lamp can be a monochrome temperature flash lamp or a bicolor temperature flash lamp. The double-color-temperature flash lamp is a combination of a warm-light flash lamp and a cold-light flash lamp, and can be used for light compensation at different color temperatures.

The audio circuitry 707 may include a microphone and a speaker. The microphone is used for collecting sound waves of a user and the environment, converting the sound waves into electric signals, and inputting the electric signals to the processor 701 for processing or inputting the electric signals to the radio frequency circuit 704 to realize voice communication. For the purpose of stereo sound collection or noise reduction, a plurality of microphones may be provided at different portions of the terminal 700. The microphone may also be an array microphone or an omni-directional pick-up microphone. The speaker is used to convert electrical signals from the processor 701 or the radio frequency circuit 704 into sound waves. The loudspeaker can be a traditional film loudspeaker or a piezoelectric ceramic loudspeaker. When the speaker is a piezoelectric ceramic speaker, the speaker can be used for purposes such as converting an electric signal into a sound wave audible to a human being, or converting an electric signal into a sound wave inaudible to a human being to measure a distance. In some embodiments, the audio circuitry 707 may also include a headphone jack.

The positioning component 708 is used to locate the current geographic Location of the terminal 700 for navigation or LBS (Location Based Service). The Positioning component 708 can be a Positioning component based on the GPS (Global Positioning System) in the united states, the beidou System in china, the graves System in russia, or the galileo System in the european union.

Power supply 709 is provided to supply power to various components of terminal 700. The power source 709 may be alternating current, direct current, disposable batteries, or rechargeable batteries. When power source 709 includes a rechargeable battery, the rechargeable battery may support wired or wireless charging. The rechargeable battery may also be used to support fast charge technology.

In some embodiments, terminal 700 also includes one or more sensors 710. The one or more sensors 710 include, but are not limited to: acceleration sensor 711, gyro sensor 712, pressure sensor 713, fingerprint sensor 714, optical sensor 715, and proximity sensor 716.

The acceleration sensor 711 can detect the magnitude of acceleration in three coordinate axes of a coordinate system established with the terminal 700. For example, the acceleration sensor 711 may be used to detect components of the gravitational acceleration in three coordinate axes. The processor 701 may control the touch screen 705 to display the user interface in a landscape view or a portrait view according to the gravitational acceleration signal collected by the acceleration sensor 711. The acceleration sensor 711 may also be used for acquisition of motion data of a game or a user.

The gyro sensor 712 may detect a body direction and a rotation angle of the terminal 700, and the gyro sensor 712 may cooperate with the acceleration sensor 711 to acquire a 3D motion of the terminal 700 by the user. From the data collected by the gyro sensor 712, the processor 701 may implement the following functions: motion sensing (such as changing the UI according to a user's tilting operation), image stabilization at the time of photographing, game control, and inertial navigation.

Pressure sensors 713 may be disposed on a side bezel of terminal 700 and/or an underlying layer of touch display 705. When the pressure sensor 713 is disposed on a side frame of the terminal 700, a user's grip signal on the terminal 700 may be detected, and the processor 701 performs right-left hand recognition or shortcut operation according to the grip signal collected by the pressure sensor 713. When the pressure sensor 713 is disposed at a lower layer of the touch display 705, the processor 701 controls the operability control on the UI interface according to the pressure operation of the user on the touch display 705. The operability control comprises at least one of a button control, a scroll bar control, an icon control and a menu control.

The fingerprint sensor 714 is used for collecting a fingerprint of a user, and the processor 701 identifies the identity of the user according to the fingerprint collected by the fingerprint sensor 714, or the fingerprint sensor 714 identifies the identity of the user according to the collected fingerprint. When the user identity is identified as a trusted identity, the processor 701 authorizes the user to perform relevant sensitive operations, including unlocking a screen, viewing encrypted information, downloading software, paying, changing settings, and the like. The fingerprint sensor 714 may be disposed on the front, back, or side of the terminal 700. When a physical button or a vendor Logo is provided on the terminal 700, the fingerprint sensor 714 may be integrated with the physical button or the vendor Logo.

The optical sensor 715 is used to collect the ambient light intensity. In one embodiment, the processor 701 may control the display brightness of the touch display 705 based on the ambient light intensity collected by the optical sensor 715. Specifically, when the ambient light intensity is high, the display brightness of the touch display screen 705 is increased; when the ambient light intensity is low, the display brightness of the touch display 705 is turned down. In another embodiment, processor 701 may also dynamically adjust the shooting parameters of camera assembly 706 based on the ambient light intensity collected by optical sensor 715.

A proximity sensor 716, also referred to as a distance sensor, is typically disposed on a front panel of the terminal 700. The proximity sensor 716 is used to collect the distance between the user and the front surface of the terminal 700. In one embodiment, when the proximity sensor 716 detects that the distance between the user and the front surface of the terminal 700 gradually decreases, the processor 701 controls the touch display 705 to switch from the bright screen state to the dark screen state; when the proximity sensor 716 detects that the distance between the user and the front surface of the terminal 700 gradually becomes larger, the processor 701 controls the touch display 705 to switch from the breath screen state to the bright screen state.

Those skilled in the art will appreciate that the configuration shown in fig. 7 is not intended to be limiting of terminal 700 and may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components may be used.

Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains.

It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof.

Claims

1. A method for predicting oil production of a horizontal well is characterized by comprising the following steps:

determining a first oil production amount corresponding to the rectangular part according to the horizontal length, the pressure difference, the oil drainage radius, the shaft radius, the distance between the horizontal well and the lower boundary of the driving range, the permeability of the oil layer, the viscosity of the oil layer, the volume coefficient of the oil layer and the thickness of the oil layer; wherein the determining a first oil production amount corresponding to the rectangular portion according to the horizontal length, the pressure difference, the oil drainage radius, the wellbore radius, the distance between the horizontal well and the lower boundary of the driving range, the permeability of the oil layer, the viscosity of the oil layer, the volume coefficient of the oil layer, and the thickness of the oil layer comprises: determining the first oil production according to the horizontal length, the pressure difference, the oil drainage radius, the shaft radius, the distance between the horizontal well and the lower boundary of the driving range, the permeability of the oil layer, the viscosity of the oil layer, the volume coefficient of the oil layer and the thickness of the oil layer by a first formula:

the formula I is as follows:

wherein, Q is₁For the first oil production, L is the horizontal length, Δ P is the pressure differential, r_eIs the drainage radius, r_wIs the wellbore radius, the z_wFor the horizontal well and the driveDistance between lower boundaries of the range, K being permeability of the reservoir, μ₀The viscosity of the oil layer is determined, the B is the volume coefficient of the oil layer, the h is the thickness of the oil layer, the ch is a hyperbolic cosine function, the cos is a hyperbolic cosine function, and the ln is a logarithmic function;

and determining second oil production corresponding to the two end parts according to the pressure difference, the oil drainage radius, the well bore radius, the permeability of the oil layer, the viscosity of the oil layer, the volume coefficient of the oil layer and the thickness of the oil layer by the following formula II:

the formula II is as follows:

wherein, Q is₂For the second oil production, Δ P is the pressure difference, r_eIs the drainage radius, r_wIs the wellbore radius, the K is the permeability of the reservoir, the μ₀Taking the viscosity of the oil layer, B is the volume coefficient of the oil layer, h is the thickness of the oil layer, and ln is a logarithmic function;

determining a permeability variation coefficient and a mobility ratio of the horizontal well, and determining a sweep coefficient of the oil layer according to the permeability variation coefficient and the mobility ratio by the following formula III:

the formula III is as follows:

wherein C is the sweep coefficient, γ is the permeability coefficient of variation, and M is the fluidity ratio; the sweep coefficient is used for describing the influence degree of the heterogeneity of the oil layer on the oil production of the horizontal well, and the sweep coefficient is in direct proportion to the influence degree;

determining a third oil production amount corresponding to the horizontal well according to the first oil production amount, the second oil production amount and the sweep coefficient; determining a third oil production amount corresponding to the horizontal well according to the first oil production amount, the second oil production amount and the sweep coefficient, wherein the determining comprises: determining the sum of the first oil production and the second oil production to obtain a fourth oil production; and determining the product of the fourth oil production and the sweep coefficient to obtain the third oil production.

2. A prediction device of oil production of a horizontal well is characterized by comprising:

a third determining module, configured to determine, according to the horizontal length, the pressure difference, the oil drainage radius, the wellbore radius, a distance between the horizontal well and a lower boundary of the driving range, a permeability of the oil layer, a viscosity of the oil layer, a volume coefficient of the oil layer, and a thickness of the oil layer, a first oil production amount corresponding to the rectangular portion; wherein the third determining module comprises: a first determining submodule, configured to determine the first oil production according to the horizontal length, the pressure difference, the oil drainage radius, the wellbore radius, a distance between the horizontal well and a lower boundary of the driving range, a permeability of the oil layer, a viscosity of the oil layer, a volume coefficient of the oil layer, and a thickness of the oil layer, according to a first formula:

the formula I is as follows:

wherein, Q is₁Is the first oil production, L isHorizontal length, Δ P is the pressure difference, r_eIs the drainage radius, r_wIs the wellbore radius, the z_wIs the distance between the horizontal well and the lower boundary of the driving range, K is the permeability of the oil layer, and mu is₀The viscosity of the oil layer is determined, the B is the volume coefficient of the oil layer, the h is the thickness of the oil layer, the ch is a hyperbolic cosine function, the cos is a hyperbolic cosine function, and the ln is a logarithmic function;

the fourth determining module includes: a second determining submodule, configured to determine the second oil production according to the pressure difference, the drainage radius, the wellbore radius, the permeability of the oil layer, the viscosity of the oil layer, the volume coefficient of the oil layer, and the thickness of the oil layer by using a second formula:

the formula II is as follows:

the fifth determining module includes: a third determining submodule, configured to determine the sweep coefficient according to the permeability coefficient of variation and the fluidity ratio by using a third formula:

the formula III is as follows:

wherein C is the sweep coefficient, γ is the permeability coefficient of variation, and M is the fluidity ratio;

a sixth determining module, configured to determine a third oil production amount corresponding to the horizontal well according to the first oil production amount, the second oil production amount, and the sweep coefficient;

the sixth determining module includes: the fourth determining submodule is used for determining the sum of the first oil production and the second oil production to obtain a fourth oil production; and the fifth determining submodule is used for determining the product of the fourth oil production and the sweep coefficient to obtain the third oil production.