CN114856532A

CN114856532A - Oil and gas reservoir transformation method, device and equipment

Info

Publication number: CN114856532A
Application number: CN202110147384.XA
Authority: CN
Inventors: 袁芳; 胥志雄; 李超; 王朝辉; 来姝君; 徐珂; 张辉; 尹国庆; 王志民; 刘新宇
Original assignee: Petrochina Co Ltd
Current assignee: Petrochina Co Ltd
Priority date: 2021-02-03
Filing date: 2021-02-03
Publication date: 2022-08-05

Abstract

According to the method, the device and the equipment for modifying the oil and gas reservoir provided by the embodiment of the application, the instruction is obtained in response to the reservoir modification mode, and the logging data of the oil and gas reservoir of the target well are obtained; then determining the minimum level main stress, the brittleness index and the fracture toughness value of the oil and gas reservoir of the target well according to the logging data; obtaining the fracturing index of the oil and gas reservoir of the target well according to the weight value of the parameters; and finally, determining a target reservoir transformation mode according to the corresponding relation between the preset fracturability index and the reservoir transformation mode. According to the scheme, the specific numerical value of the fracturability index in the oil-gas reservoir can be calculated through the minimum horizontal principal stress, the brittleness index, the fracture toughness and the weight of the fracture toughness of the oil-gas reservoir, so that the actual condition of the oil-gas reservoir of the target well can be accurately determined, the production improvement and transformation mode corresponding to the oil-gas reservoir can be accurately determined, and the single-well yield is finally improved.

Description

Oil and gas reservoir transformation method, device and equipment

Technical Field

The application relates to the technical field of oil and gas exploitation, in particular to a method, a device and equipment for oil and gas reservoir transformation.

Background

Rock formations capable of storing and percolating hydrocarbons are known as hydrocarbon reservoirs. At present, most of oil and gas reserves come from sedimentary rock formations, of which sandstone and carbonate are the most common. Because sandstone has the characteristics of heterogeneity, low porosity, low permeability, large airflow resistance and the like, volume fracturing is required to be carried out aiming at oil and gas exploitation of sandstone oil and gas reservoirs at present, so that a complex and communicable fracture network is formed in the sandstone oil and gas reservoirs, the fracture volume can be maximally reformed, and the single-well yield can be improved.

The fracability of a sandstone oil and gas reservoir is used as an important evaluation parameter in sandstone oil and gas development, and is of great importance in determining a fracturing position and whether fracturing is successful or not. The fracturing performance of the sandstone oil and gas reservoir refers to the difficulty and development tendency of fracture extension of the sandstone oil and gas reservoir under the self-existing environment. In practical application, the fracture length formed under the same fracture construction environment can be used for representing the fracturing capability of the sandstone oil and gas reservoir. The longer the fracture, the better the fracability.

However, in the prior art, the fracturability of the sandstone oil and gas reservoir is qualitatively evaluated according to the brittleness index, the horizontal principal stress difference index, the stress difference between the sandstone oil and gas reservoir and the confining pressure and whether or not a microfracture develops, so that the obtained fracturability of the sandstone oil and gas reservoir is not accurate, the subsequent accurate reservoir transformation mode is influenced, and finally the yield of a single well is low.

Disclosure of Invention

In view of the above problems, an object of the embodiments of the present application is to provide a method, an apparatus, and a device for improving a hydrocarbon reservoir, which are used to quantify the fracturing capability of a hydrocarbon reservoir, determine an accurate reservoir improvement manner according to the quantified fracturing capability, and improve the single well yield.

In order to solve the above technical problem, an embodiment of the present application provides the following technical solutions:

in a first aspect, an embodiment of the present application provides a method for hydrocarbon reservoir reformation, including:

obtaining a command in response to a reservoir transformation mode, and obtaining logging data of an oil and gas reservoir of a target well;

determining the minimum level main stress, the brittleness index and the fracture toughness value of the oil and gas reservoir of the target well according to the logging data;

obtaining a fracturing index of an oil and gas reservoir of the target well according to the minimum level principal stress, the brittleness index and the fracture toughness value, and the weight value of the minimum level principal stress, the brittleness index and the fracture toughness value;

and determining a target reservoir transformation mode corresponding to the fracturing index according to the corresponding relation between the preset fracturing index and the reservoir transformation mode, wherein the target reservoir transformation mode is used for carrying out oil and gas reservoir transformation on the target well.

Optionally, before obtaining the fracturability index of the oil and gas reservoir of the target well according to the minimum level principal stress, the brittleness index, and the fracture toughness value, and the weight value of the minimum level principal stress, the weight value of the brittleness index, and the weight value of the fracture toughness value, the method further includes:

determining natural fracture surface stress in an oil and gas reservoir of the target well according to the logging data;

obtaining a fracturability index of the hydrocarbon reservoir of the target well according to the minimum level principal stress, the brittleness index, the fracture toughness value, and according to the weight value of the minimum level principal stress, the brittleness index, and the fracture toughness value, the fracturability index comprising:

and obtaining the fracturing index of the oil and gas reservoir of the target well according to the minimum level principal stress, the brittleness index, the fracture toughness value and the natural fracture surface stress, and the weight value of the minimum level principal stress, the weight value of the brittleness index, the weight value of the fracture toughness value and the weight value of the natural fracture surface stress.

Optionally, determining the natural fracture surface stress in the hydrocarbon reservoir of the target well from the logging data comprises:

determining natural fracture surface normal stress and natural fracture surface shear stress in an oil and gas reservoir of a target well according to the logging data;

and determining the natural fracture surface stress in the oil and gas reservoir of the target well according to the natural fracture surface normal stress and the natural fracture surface shear stress in the oil and gas reservoir of the target well.

Optionally, determining a target reservoir modification mode corresponding to the fracturability index according to a corresponding relationship between a preset fracturability index and the reservoir modification mode includes:

when the fracturability index is less than or equal to a first preset value and is greater than or equal to a second preset value, determining that the target reservoir transformation mode is a barite pollution-free acid fracturing transformation mode;

when the fracturability index is smaller than a second preset value and is larger than or equal to a third preset value, determining that the target reservoir transformation mode is a sand fracturing transformation mode smaller than a preset scale;

when the fracturability index is smaller than a third preset value and is larger than or equal to a fourth preset value, determining that the target reservoir transformation mode is a sand fracturing transformation mode larger than a preset scale;

when the fracturing index is smaller than a fourth preset value, determining whether a sand fracturing modification mode is carried out on the near-well reservoir according to the development condition of the near-well reservoir;

the first preset value is larger than the second preset value, the second preset value is larger than the third preset value, and the third preset value is larger than the fourth preset value.

Optionally, after determining the target reservoir modification mode according to the corresponding relationship between the fracturability index and the reservoir modification mode, the method further includes:

determining a target perforation section corresponding to the target reservoir transformation mode according to the target reservoir transformation mode;

when the target reservoir transformation mode is a barite pollution-removing acid fracturing transformation mode, determining a target perforation section as a fracture development zone;

and when the target reservoir stratum transformation mode is a sand fracturing transformation mode, determining the target perforation section to be the periphery of a fracture development zone.

Optionally, after determining the target perforation segment corresponding to the target reservoir modification mode according to the target reservoir modification mode, the method further includes:

performing fracture opening simulation according to the logging data, the target reservoir transformation mode and the target perforation section to obtain at least one fracture opening result of the oil and gas reservoir of the target well corresponding to at least one construction pressure value;

and determining the target construction pressure according to at least one crack opening result.

Optionally, after determining the target construction pressure according to at least one crack opening result, the method further includes:

performing fracture simulation according to the target construction pressure, the target perforation section and the target reservoir transformation mode to obtain at least one data of fracture parameters, preset yield and safety factors;

and determining the construction range according to at least one data of the crack parameters, the preset yield and the safety factor.

Optionally, after determining the construction range according to at least one data of the crack parameter, the preset yield and the safety factor, the method further includes:

and generating a modification template according to at least one of the logging data, the target reservoir modification mode, the target perforation section, the target construction pressure and the target construction range, wherein the modification template is used for guiding the modification of the oil and gas reservoir.

In a second aspect, an embodiment of the present application provides a hydrocarbon reservoir reforming apparatus, including:

the acquisition module is used for responding to the reservoir transformation mode acquisition instruction and acquiring logging data of an oil and gas reservoir of the target well;

the determining module is used for determining the minimum level main stress, the brittleness index and the fracture toughness value of the oil and gas reservoir of the target well according to the logging data;

the processing module is used for obtaining the fracturing index of the oil and gas reservoir of the target well according to the minimum level principal stress, the brittleness index and the fracture toughness value as well as the weight value of the minimum level principal stress, the weight value of the brittleness index and the weight value of the fracture toughness value;

the determining module is further used for determining a target reservoir transformation mode corresponding to the fracturability index according to the corresponding relation between the preset fracturability index and the reservoir transformation mode, and the target reservoir transformation mode is used for carrying out oil and gas reservoir transformation on the target well.

In a third aspect, an embodiment of the present application provides an electronic device, including:

a memory and a processor;

the memory is used for storing program instructions;

the processor is used for calling the program instructions in the memory to execute the method of the first aspect.

In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, on which a computer program is stored; the computer program, when executed, implements a hydrocarbon reservoir modification method as described in the first aspect.

In a fifth aspect, embodiments of the present application provide a computer program product comprising a computer program that, when executed by a processor, implements a method of hydrocarbon reservoir reformation as described in the first aspect.

Drawings

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

Fig. 1 is a schematic view of a scenario of a hydrocarbon reservoir reforming method according to an embodiment of the present application;

FIG. 2 is a flow chart of a hydrocarbon reservoir reformation method provided by an embodiment of the present application;

FIG. 3 is a flow chart of a hydrocarbon reservoir reformation method provided in another embodiment of the present application;

FIG. 4 is a schematic illustration of a natural fracture strike-through of a hydrocarbon reservoir of a target well according to an embodiment of the present application;

FIG. 5 is a schematic diagram of a relationship between a natural fracture strike and a maximum horizontal principal stress angle of a hydrocarbon reservoir of a target well and a number of natural fractures provided in an embodiment of the present application;

FIG. 6 is a schematic structural diagram of a hydrocarbon reservoir modification apparatus provided in an embodiment of the present application;

fig. 7 is a schematic structural diagram of an electronic device according to an embodiment of the present application.

With the above figures, there are shown specific embodiments of the present application, which will be described in more detail below. These drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the inventive concepts to those skilled in the art by reference to specific embodiments.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. The following description refers to the accompanying drawings in which the same 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 application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

Rock formations capable of storing and percolating hydrocarbons are known as hydrocarbon reservoirs. At present, most of oil and gas reserves come from sedimentary rock formations, of which sandstone and carbonate are the most common. The sandstone oil and gas reservoir is below 6000 meters underground. Because the sandstone oil and gas reservoir is deep, the porosity and the permeability are low, and further the single-well yield is low, the sandstone oil and gas reservoir needs to be modified so as to improve the single-well yield.

In an actual application scene, the sandstone oil and gas reservoir transformation method is mainly applied to the completion and oil testing transformation of the sandstone oil and gas reservoir. Namely, after the well is drilled, oil and gas testing is carried out on the sandstone oil and gas reservoir, and then the sandstone oil and gas reservoir is transformed according to the testing result.

Because sandstone has the characteristics of heterogeneity, low porosity, low permeability, large airflow resistance and the like, the current modification of sandstone oil and gas reservoirs mainly comprises the following steps: and performing volume fracturing on the oil and gas reservoir to form a complex and communicable fracture network in the sandstone oil and gas reservoir, so that the fracture volume can be maximally improved, and the single-well yield is improved.

Therefore, the fracability of the sandstone oil and gas reservoir is used as an important evaluation parameter in sandstone oil and gas development, and is important when determining the fracturing position and the success of fracturing. The fracturing performance of the sandstone oil and gas reservoir refers to the difficulty and development tendency of fracture extension of the sandstone oil and gas reservoir under the self-existing environment. In practical application, the fracture length formed under the same fracture construction environment can be used for representing the fracturing capability of the sandstone oil and gas reservoir. The longer the fracture, the better the fracability.

However, in the prior art, the fracturability of the sandstone oil and gas reservoir is qualitatively evaluated according to the brittleness index, the horizontal principal stress difference index, the stress difference between the sandstone oil and gas reservoir and the confining pressure and whether or not a microfracture develops, so that the obtained fracturability of the sandstone oil and gas reservoir is not accurate, and the subsequent accurate reservoir transformation mode is influenced.

In view of this, the embodiment of the present application provides a method for reforming an oil and gas reservoir, which determines a minimum level principal stress, a brittleness index and a fracture toughness value of the oil and gas reservoir of a target well according to logging data of the target well; obtaining the fracturing index of the oil and gas reservoir of the target well according to the weight value of the parameters; and finally, determining a target reservoir transformation mode according to a preset fracability index. The specific numerical value of the fracturability index in the oil and gas reservoir can be calculated through the minimum horizontal principal stress, the brittleness index, the fracture toughness and the weight of the oil and gas reservoir, so that the actual condition of the oil and gas reservoir of the target well can be accurately determined, the production improvement and transformation mode corresponding to the oil and gas reservoir can be accurately determined, and the single-well yield can be finally improved.

Fig. 1 is a scene schematic diagram of a hydrocarbon reservoir transformation method according to an embodiment of the present application. As shown in fig. 1, the scenario includes: a terminal device 101 and a server 102.

In the embodiment of the present application, the terminal device 101 may be any terminal, for example, a user equipment for machine type communication. The terminal 101 may also be referred to as a User Equipment (UE), a Mobile Station (MS), a mobile terminal (mobile terminal), a terminal (terminal), and the like, for example, the terminal may be a desktop computer, a notebook, a Personal Digital Assistant (PDA), a smart phone, a tablet computer, and the like. The desktop computer is taken as an example in the present scenario, it should be noted that the number of the terminal devices 101 may be multiple, and one example is taken as an example in the present embodiment.

The server 102 may include service points that provide processes, databases, and communications facilities. The server 102 may be a unitary server or a distributed server across multiple computers or computer data centers. The server 102 may be of various types, such as, but not limited to, a web server, a message server, an application server, an interaction server, a database server, or a proxy server, among others.

The terminal device 101 may communicate with the server 102 through a wireless or wired network, and is configured to send an instruction to the server 101. The wireless network may be a 2G, 3G, 4G, or 5G communication network, or may be a wireless local area network, which is not limited herein.

In practical application, a user can trigger the oil and gas reservoir transformation party acquisition instruction at the terminal device 101, but after receiving the oil and gas reservoir transformation party acquisition instruction, the server 102 determines the oil and gas reservoir transformation mode according to the instruction.

Specifically, the server 102 obtains logging data for obtaining a hydrocarbon reservoir of the target well. On one hand, the logging data of the oil and gas reservoir of the target well can be data stored locally in the terminal device 101, and the logging data of the target well is synchronously sent to the server when an instruction is sent; on the other hand, the server 102 may also obtain the identification information of the target well in the instruction in the network after receiving the acquisition instruction of the hydrocarbon reservoir transformation party, which is not specifically limited in the embodiment of the present application.

Further, the server 102 obtains the oil and gas reservoir of the target well according to the logging data, and determines the target reservoir transformation mode corresponding to the fracturability index according to the corresponding relationship between the preset fracturability index and the reservoir transformation mode.

Optionally, after the server 102 determines the hydrocarbon reservoir transformation manner, the determined hydrocarbon reservoir transformation manner may be sent to the terminal device 101 for displaying the determined transformation manner to the user.

According to the scheme, the specific numerical value of the fracturability index in the oil-gas reservoir can be calculated through the minimum horizontal principal stress, the brittleness index, the fracture toughness and the weight of the fracture toughness of the oil-gas reservoir, so that the actual condition of the oil-gas reservoir of the target well can be accurately determined, the production improvement and transformation mode corresponding to the oil-gas reservoir can be accurately determined, and the single-well yield is finally improved.

Fig. 2 is a flow chart of a hydrocarbon reservoir reforming method according to an embodiment of the present application, and as shown in fig. 2, the method may include:

s201, responding to a reservoir transformation mode obtaining instruction, and obtaining logging data of an oil and gas reservoir of a target well.

Here, the logging data may be collected from drilling engineering data, or may be directly measured in the target downhole by using a logging tool, and the embodiment of the present application is not particularly limited.

In particular, the well log data may include: natural gamma, natural potential, borehole diameter, formation resistivity, formation density, conventional acoustic, imaging data, shear data, and the like. Since rocks generally contain different amounts of radioactive elements and emit radiation continuously, lithology, properties, oil and gas bearing properties, salinity of brine, etc. of rock formations can be derived by measuring the natural gamma ray intensity of the rock formations along the wellbore.

Wherein the natural potential is an electrode potential of a metal in a corrosion system without an influence of an external current. According to the detection result of the natural potential, the corrosivity of the metal pipeline passing through the position can be judged, and the surrounding rock stratum environment can be evaluated. The hole diameter is the diameter of the borehole being drilled. The formation resistivity is the resistivity of the rock measured in the borehole using power and measure electrodes arranged at different locations. Because the resistivity of the oil and gas in the underground is a physical quantity which can not be directly observed or measured, the resistivity of the oil and gas can be indirectly measured only when current passes through the physical quantity, and therefore, certain current needs to be introduced into a rock stratum, and the resistivity of the oil and gas can be indirectly obtained. By analyzing the emitted gamma rays, the formation density can be measured. The conventional sound wave is utilized to propagate in the rock, and the underground geological planing surface can be measured through the change of the speed, the amplitude, the frequency and the like of the sound wave. According to the observation of the geophysical field in the borehole, the physical parameters of the borehole wall and objects around the borehole are imaged, and imaging data can be obtained. By adopting the dipole sound wave source, the pressure on one side of the well wall is increased, the pressure on the other side of the well wall is reduced, the well wall is disturbed to form slight deflection, longitudinal waves and transverse waves are directly excited in a stratum, and lithology, division of crack zones and the like can be identified.

S202, determining the minimum level principal stress, the brittleness index and the fracture toughness value of the oil and gas reservoir of the target well according to the logging data.

Specifically, after the logging data are obtained, the data such as pore pressure, rock mechanical parameters, ground stress and the like of the oil and gas reservoir of the target well can be calculated according to the logging data, and then the minimum level main stress, the brittleness index and the fracture toughness of the oil and gas reservoir can be calculated. The above calculation may adopt the conventional calculation method, and thus is not described herein again.

The minimum horizontal principal stress here refers to the smallest principal stress in the horizontal direction of the hydrocarbon reservoir. And the crack can not be opened by adopting the strength less than the minimum horizontal main stress for opening.

The brittleness index refers to the amount of deformation of a hydrocarbon reservoir that is only small under external forces (e.g., stretching, impact, etc.). Fracture toughness is a resistance value at which fracture occurs in the presence of cracks or crack-like cracks. Wherein the greater the fracture toughness, the lower the likelihood of further cracking of the crack. These are all related to whether a hydrocarbon reservoir can be fractured successfully. The higher the brittleness index, the lower the fracture toughness, and the lower the compressive strength (i.e., the lower the minimum level of principal stress), the easier it is to fracture successfully.

The embodiment of the application does not specifically limit the obtaining mode of the brittleness index, and as an alternative, the method can obtain the static Young modulus and the Poisson ratio of the oil and gas reservoir based on the logging data, and then obtain the brittleness index according to the static Young modulus and the Poisson ratio of the oil and gas reservoir.

Wherein the static Young's modulus is a physical quantity describing the ability of a solid material to resist deformation under the action of a certain external force. Poisson's ratio refers to the ratio of the absolute value of the transverse positive strain to the axial positive strain of a material when the material is under unidirectional tension or compression. The static young's modulus and poisson's ratio may be obtained directly from logging data, or indirectly from logging data, and are not limited herein.

Further, the static Young modulus and the Poisson ratio are respectively normalized, so that the brittleness index can be calculated in the subsequent process, and the fracturability index can be calculated conveniently. And finally, obtaining the brittleness index of the oil and gas reservoir according to the sum result of the normalized static Young modulus and Poisson ratio.

Specifically, the static young's modulus is normalized by using the following formula (1):

E _Brit ＝(E-E _min )/(E _max -E _min ) X 100 formula (1)

Wherein E is _Brit Is the normalized static Young's modulus, E is the static Young's modulus at a certain depth in the oil and gas reservoir, E _max And E _min The maximum value and the minimum value of the static Young's modulus in the depth range of the depth are respectively.

Here, it should be noted that: the static Young modulus is normalized, so that a large error caused by fluctuation generated in measurement in calculating the static Young modulus can be avoided, and the accuracy of the static Young modulus is improved.

Alternatively, the Poisson's ratio can be normalized using the following equation (2),

μ _Brit ＝(μ _max -μ)/(μ _max -μ _min ) X 100 formula (2)

Wherein, mu _Brit Is normalized Poisson's ratio, E is the Poisson's ratio at a certain depth in the oil and gas reservoir, mu _max And mu _min Respectively the maximum and minimum values of the poisson's ratio in the depth range of the above-mentioned depths.

Here, it should be noted that: the Poisson ratio is normalized, so that a large error caused by fluctuation generated in measurement in calculation of the Poisson ratio can be avoided, and the accuracy of the Poisson ratio is improved.

Further, summing the normalized static young's modulus and poisson's ratio, the brittleness index can be obtained by the following formula (3):

I _b ＝m·E _Brit +n·μ _Brit formula (3)

Wherein, I _b Is a brittleness index, E _Brit Is the normalized static Young's modulus, μ _Brit Is the normalized poisson ratio.

Here, it should be noted that: e in formula (3) _Brit And mu _Brit The former coefficient may be adjusted according to actual conditions, and the embodiment of the present application is not limited, for example, the values of m and n may be 0.5.

S203, obtaining the fracturing index of the oil and gas reservoir of the target well according to the minimum level principal stress, the brittleness index and the fracture toughness value, and the weight value of the minimum level principal stress, the brittleness index and the fracture toughness value.

First, a weight value of the minimum level principal stress, a weight value of the brittleness index, and a weight value of the fracture toughness value are determined.

Specifically, after the minimum level principal stress, the brittleness index and the fracture toughness of the oil and gas reservoir are determined, corresponding weights need to be assigned to the minimum level principal stress, the brittleness index and the fracture toughness value. That is, the degree of influence of the minimum level of principal stress, the brittleness index and the fracture toughness value on the fracturing process of the oil and gas reservoir respectively is determined.

Generally, the weight can be expressed in percentage or in integer or decimal, where the decimal can be a decimal greater than 0 and less than 1. Of course, the above-mentioned weights can also be expressed in other forms, and are not listed here.

In the specific implementation process, the weight of the minimum level principal stress, the weight of the brittleness index and the weight of the fracture toughness value can be determined according to previous experience of the region of the oil and gas reservoir; or the same value can be set first and then adjusted according to the actual effect of the subsequent fracturing. The examples of the present application are not particularly limited with respect to the specific determination of the weights of the minimum level principal stress, the brittleness index, and the fracture toughness. Here, it should be noted that: if the weights are set to the same value in advance, the sum of the weights may be made 1. In this way, it is advantageous to control the numerical range of the later fracability index. The numerical range of the compressibility index is controlled within a certain range, and corresponding modification modes can be formulated specifically for different fracturability indexes, so that the oil and gas reservoir can be modified more specifically.

And further, obtaining the fracturing index of the oil and gas reservoir by a linear weighting sum method according to the minimum level principal stress, the brittleness index and the fracture toughness value, and the weight value of the minimum level principal stress, the brittleness index and the fracture toughness value.

Specifically, the minimum horizontal principal stress of the oil and gas reservoir is multiplied by the weight value of the minimum horizontal principal stress to obtain a first numerical value, the brittleness index of the oil and gas reservoir is multiplied by the weight value of the brittleness index to obtain a second numerical value, the fracture toughness value of the oil and gas reservoir is multiplied by the weight value of the fracture toughness value to obtain a third numerical value, and then the first numerical value, the second numerical value and the third numerical value are added to obtain a sum, namely the fracturability index of the oil and gas reservoir. Through the algorithm, the accurate fracturability index can be obtained according to the minimum level principal stress, the brittleness index and the fracture toughness value, so that the position which is easy to be fractured in the oil and gas reservoir can be found according to the fracturability index of the oil and gas reservoir, the success of fracturing is facilitated, and the single well yield is improved.

The fracturing index is a specific numerical value, can represent the fracturing difficulty of each position in an oil and gas reservoir more accurately, and can help exploration personnel to find the fracturing position more accurately, so that the fracturing success rate is improved, and the single-well yield is improved.

S204, determining a target reservoir transformation mode corresponding to the fracturability index according to the corresponding relation between the preset fracturability index and the reservoir transformation mode.

The target reservoir transformation mode is used for carrying out oil and gas reservoir transformation on the target well.

Because the region of the oil and gas reservoir is large, logging data of different small regions are different, and then fracturing indexes of wells corresponding to the oil and gas reservoir are different, different reservoir modification modes can be formulated according to different fracturing indexes, after the fracturing indexes of the wells are determined, corresponding target reservoir modification modes can be rapidly determined through preset corresponding relations, and therefore single-well modification efficiency is improved.

Specifically, the embodiment of the application specifically defines the layout of the correspondence relationship between the preset fracturability index and the reservoir transformation mode, for example, the oil and gas reservoirs can be divided into different types of reservoirs, each type of reservoir corresponds to a range of fracturability index, the ranges of the fracturability indexes of the various types of reservoirs are different, and all possible fracturability indexes of the oil and gas reservoirs can be contained by connecting the fracturability index ranges of the various types of reservoirs end to end. And according to the characteristics of each type of reservoir, a corresponding reservoir transformation mode is preset. Thus, the corresponding relation between the fracturing index, the reservoir type and the reservoir transformation mode is formed.

In the specific implementation process, after the fracturability index of the oil and gas reservoir is calculated, the range of the fracturability index where the fracturability index is located is found in the corresponding relation, and then which type of reservoir the reservoir belongs to is determined, and then the corresponding target reservoir transformation mode is found. Therefore, the oil and gas reservoir can be transformed by adopting a corresponding target reservoir transformation mode, so that the single-well yield is improved.

As can be seen from the above, the method for modifying an oil and gas reservoir provided by the embodiment of the application responds to the reservoir modification mode acquisition instruction, and acquires the logging data of the oil and gas reservoir of the target well; then determining the minimum level main stress, the brittleness index and the fracture toughness value of the oil and gas reservoir of the target well according to the logging data; obtaining the fracturing index of the oil and gas reservoir of the target well according to the weight value of the parameters; and finally, determining a target reservoir transformation mode according to the corresponding relation between the preset fracturability index and the reservoir transformation mode. According to the scheme, the specific numerical value of the fracturability index in the oil-gas reservoir can be calculated through the minimum horizontal principal stress, the brittleness index, the fracture toughness and the weight of the fracture toughness of the oil-gas reservoir, so that the actual condition of the oil-gas reservoir of the target well can be accurately determined, the production improvement and transformation mode corresponding to the oil-gas reservoir can be accurately determined, and the single-well yield is finally improved.

Fig. 3 is a flow chart of a hydrocarbon reservoir reformation method according to another embodiment of the present application. On the basis of the above embodiments, the present embodiment describes the above embodiments in more detail, and as shown in fig. 3, the method for modifying a hydrocarbon reservoir provided by the embodiment of the present application may include the following steps:

s301, responding to the reservoir transformation mode obtaining instruction, and obtaining logging data of the oil and gas reservoir of the target well.

The implementation manner and the beneficial effects of this step are the same as those of step 201 in the embodiment shown in fig. 2, and reference may be specifically made to the embodiment shown in fig. 2, which is not described herein again.

S302, determining the minimum level main stress, the brittleness index and the fracture toughness value of the oil and gas reservoir of the target well according to the logging data.

The minimum level principal stress, the brittleness index, and the fracture toughness in this step are the same as the method for obtaining the minimum level principal stress, the brittleness index, and the fracture toughness value in step S102 in the embodiment shown in fig. 2, and reference may be specifically made to the embodiment shown in fig. 2, which is not repeated here.

S303, determining the natural fracture surface stress in the oil and gas reservoir of the target well according to the logging data.

The natural fracture face stress is mainly explained here. Natural fractures, i.e., fractures that occur naturally and are not artificially fractured, also exist in hydrocarbon reservoirs. Therefore, when the oil and gas reservoir is transformed, natural cracks are taken into consideration, the natural cracks can be communicated with artificial cracks, a complex crack network is formed, oil and gas permeation is facilitated, fracturing can be performed on the basis of the natural cracks, and fracturing success rate and fracturing effect are improved.

Generally, the greater the natural fracture face stress, the greater the likelihood of further fracture of the natural fracture face after artificial fracturing.

The embodiment of the present application does not specifically limit the acquisition scheme of the natural fracture surface stress, and as an alternative, the normal stress and the shear stress of the natural fracture surface may be obtained based on logging data, where the normal stress and the shear stress of the natural fracture surface are obtained directly from the logging data or indirectly from the logging data, and are not limited here.

Further, after the normal stress and the shear stress of the natural fracture surface are obtained, the natural fracture surface stress can be calculated by the following formula (4).

Wherein σ _ne 、σ _{ne max} 、σ _{ne min} Respectively the maximum value and the minimum value of the natural crack surface normal stress and the corresponding depth range, and tau is the natural crack surface shear stress.

It should be noted here that the area of the hydrocarbon reservoir is large, the area where the natural fracture surface is located may also be large, and the normal stresses at different positions may be different for the same natural fracture surface, so when the normal stress at a certain position of the natural fracture surface is calculated, normalization processing needs to be performed in combination with the normal stresses at the surrounding positions, so as to avoid a calculation error of the natural fracture surface stress at the certain position due to a measurement error at the certain position.

S304, determining the weight of the minimum level main stress, the natural crack surface stress, the brittleness index and the fracture toughness value.

The manner in which the weight of the minimum level principal stress, the weight of the natural fracture face stress, the weight of the brittleness index, and the weight of the fracture toughness value are determined in this step is similar to the scheme in step S202 in the embodiment shown in fig. 2. The differences are only: the sum of the weight of the minimum level principal stress, the weight of the natural fracture face stress, the weight of the brittleness index, and the weight of the fracture toughness value needs to be 1. In the initial stage, the weight of the minimum level principal stress, the weight of the natural fracture surface stress, the weight of the brittleness index and the weight of the fracture toughness value can all be set to be the same value, namely all are 0.25, and then the adjustment is carried out according to different experiences in each region.

S305, obtaining the fracturing index of the oil and gas reservoir of the target well according to the minimum level principal stress, the brittleness index, the fracture toughness value, the natural fracture surface stress, the weight value of the minimum level principal stress, the weight value of the brittleness index, the weight value of the fracture toughness value and the weight value of the natural fracture surface stress.

Specifically, the minimum horizontal principal stress of the oil and gas reservoir is multiplied by the weight of the minimum horizontal principal stress to obtain a first numerical value, the natural fracture surface stress of the oil and gas reservoir is multiplied by the weight of the natural fracture surface stress to obtain a second numerical value, the brittleness index of the oil and gas reservoir is multiplied by the weight of the brittleness index to obtain a third numerical value, the fracture toughness of the oil and gas reservoir is multiplied by the weight of the fracture toughness to obtain a fourth numerical value, and the four numerical values are added to obtain a sum, namely the fracturability index of the oil and gas reservoir. In the scheme, the position which is easy to fracture in the oil and gas reservoir can be found according to the fracturing index of the oil and gas reservoir, the success of fracturing is facilitated, and the yield of a single well is improved.

As an alternative, the fracability index of a hydrocarbon reservoir may be calculated according to the following equation (5):

wherein, I _f Is the fracability index, σ, of the hydrocarbon reservoir _h 、σ _{h max} 、σ _{h min} Respectively the minimum level principal stress of the oil and gas reservoir and the maximum and minimum values, I, within the corresponding depth range _b 、I _{b max} 、I _{b min} Respectively the brittleness index of the oil and gas reservoir and the maximum value and the minimum value in the corresponding depth range, K _IC 、K _{IC max} 、K _{IC min} Respectively the fracture toughness of the oil and gas reservoir and the maximum value and the minimum value in the corresponding depth range, W ₁ 、W ₂ 、W ₃ 、W ₄ Respectively, minimum level principalForce, natural fracture face stress, brittleness index, and fracture toughness value.

Here, it should be noted that: the static Young's modulus, Poisson's ratio, brittleness index and fracturability index are dimensionless, and the unit of fracture toughness is generally MPa.m ^1/2 The unit of the minimum horizontal principal stress and the crack surface stress is generally MPa.

S306, determining a target reservoir transformation mode corresponding to the fracturability index according to the corresponding relation between the preset fracturability index and the reservoir transformation mode.

In the specific implementation process, hydrocarbon reservoirs can be classified into four categories: the reservoir type comprises a first reservoir type, a second reservoir type, a third reservoir type and a fourth reservoir type. Wherein, each type of reservoir is corresponding to a range of fracability indexes. For example: in the first type of reservoir, the second preset value is less than or equal to the fracturing index and less than or equal to the first preset value; in the second type of reservoir, the third preset value is less than or equal to the fracturing index and less than the second preset value; in a third type of reservoir, the fourth preset value is less than or equal to the fracturing index and less than the third preset value; in a fourth type of reservoir, the fracability index is less than a fourth preset value.

The fourth preset value is less than or equal to the third preset value, and the second preset value is less than or equal to the first preset value.

Further, determining the transformation mode of each type of oil and gas reservoir according to the following modes:

(1) for the first type of reservoir, namely when the fracturability index is less than or equal to a first preset value and is greater than or equal to a second preset value, determining that the target reservoir transformation mode is a barite pollution-free acid fracturing transformation mode, wherein the well can be a vertical well or a horizontal well;

(2) for the second type of reservoir, namely when the fracturability index is smaller than a second preset value and is larger than or equal to a third preset value, determining that the target reservoir transformation mode is a sand fracturing transformation mode smaller than the preset scale;

(3) for a third type of reservoir, namely when the fracturability index is smaller than a third preset value and is larger than or equal to a fourth preset value, determining that the target reservoir transformation mode is a sand fracturing transformation mode with the scale larger than the preset scale;

(4) for the fourth type of reservoir, namely when the fracturability index is smaller than the fourth preset value, the well corresponding to the fracturability index is not suitable for reconstruction, and then whether the near-well reservoir is sidetracked or not can be considered according to the development condition of the near-well reservoir, and the production can be improved in a reconstruction mode on the basis of sidetracking.

Specifically, whether a sand fracturing reformation mode is carried out on the near-well reservoir or not can be determined according to the development condition of the near-well reservoir.

On one hand, when the development condition of the near-well reservoir meets a preset development standard, determining sand fracturing on the near-well reservoir;

and on the other hand, when the development condition of the near-well reservoir layer does not meet the preset development standard, determining not to perform sand fracturing on the near-well reservoir layer.

In the specific implementation process, when the development condition of the near-well reservoir meets the preset development standard, the near-well reservoir is modified, more oil gas can be obtained, and therefore sand fracturing is determined to be performed on the near-well reservoir; when the development condition of the near-well reservoir layer does not meet the preset development standard, the situation that even if the near-well reservoir layer is modified, more oil gas cannot be obtained is shown, so that sand fracturing is not carried out on the near-well reservoir layer, and useless modification work is reduced.

Here, it should be noted that: the preset development standard refers to the predicted development condition of the well-near reservoir with better development. The preset development standard can be determined according to the actual conditions of different regions. In areas with low oil and gas yield, the preset development standard can be set lower; in areas with high oil and gas production, the pre-set development criteria may be set higher. The specific setting rule for the preset development standard is not limited herein.

On the basis of determining a reservoir transformation mode according to the fracturability index, comprehensive judgment needs to be carried out by combining factors such as oil and gas display, physical properties, lithology, distance from a fault, distance from a water layer and the like of an oil and gas reservoir.

In practical applications, the embodiments of the present application do not specifically limit the first preset value, the second preset value, the third preset value, and the fourth preset value. For example, the first preset value may be 1, the second preset value may be 0.6, the third preset value may be 0.4, and the fourth preset value may be 0.2. Of course, the specific data of the first preset value, the second preset value, the third preset value and the fourth preset value may also be adjusted according to the actual situation, which is not limited herein.

It should also be noted that: when sand fracturing is carried out, the condition that the size is smaller than the preset size is opposite to the condition that the size is larger than the preset size, the preset size is not a specific and unchangeable size, and the preset size can be flexibly changed according to the actual condition of an oil and gas reservoir in a region. Also, a near-well reservoir refers to a hydrocarbon reservoir that is closer to the wellhead. If the well corresponding to the fracturable index is not suitable for reconstruction and the near well has an oil and gas reservoir, sidetracking can be adopted for the near well reservoir, and then sand fracturing reconstruction is carried out, so that the oil and gas yield is improved.

And S307, determining a target perforation section corresponding to the target reservoir reconstruction mode according to the target reservoir reconstruction mode.

That is, when the fracturability index of the target well is between 0.6 and 1, determining a reservoir transformation mode adopting acid fracturing, and when the reservoir transformation is specifically carried out, mainly shooting a fracture development zone, and recommending that the fracture opening degree is 50 to 60 percent. When the fracturing index of the target well is between 0.4 and 0.6 or between 0.2 and 0.4, determining a reservoir stratum modification mode of sand fracturing, and when the reservoir stratum modification is carried out specifically, mainly near a crack development zone, recommending that the crack opening degree is 30 to 40 percent.

S308, performing fracture opening simulation according to the logging data, the target reservoir transformation mode and the target perforation section to obtain at least one fracture opening result of the oil and gas reservoir of the target well corresponding to at least one construction pressure value; and determining the target construction pressure according to at least one crack opening result.

Firstly, the collapse direction of a target well can be estimated through logging data of an oil and gas reservoir of the target well, so that the main stress direction of a region (such as 110 degrees of south east, approximate east west direction and the like) can be determined, and the triaxial ground stress of the well can be inverted (such as the horizontal minimum main stress of about 2.17MPa/100m, the vertical stress of about 2.45MPa/100m and the horizontal maximum main stress of about 2.61-2.71MPa/100 m), so that the Young modulus, the Poisson ratio, the compressive strength, the fracturability index and the like can be further calculated.

Then, all natural fractures in the oil and gas reservoir can be picked up through imaging data in logging data of the oil and gas reservoir, and the condition of an included angle between the trend of the natural fractures and the maximum principal stress azimuth is further determined by combining the triaxial crustal stress.

Illustratively, fig. 4 is a schematic illustration of a natural fracture strike-through of a hydrocarbon reservoir of a target well provided by an embodiment of the present application. As shown in FIG. 4, 37 natural fractures can be taken out from the imaging data of the target well at any time, the natural fracture dip angle is mainly 60-80 degrees, and the main body orientation is 100-130 degrees southeast.

For example, fig. 5 is a schematic diagram of the relationship between the natural fracture strike and the maximum horizontal principal stress angle of the hydrocarbon reservoir of the target well and the number of natural fractures provided by an embodiment of the present application.

As shown in FIG. 5, the natural fracture strike included 15-45 of the maximum horizontal principal stress for 7 natural fractures, accounting for 19% of the total.

And then, simulating fracture opening of the oil and gas reservoir under different pressures based on the data obtained in the front of the included angle between the trend of the natural fracture and the maximum principal stress azimuth, the reservoir transformation mode, the perforation section and the like.

In the specific implementation process, the existing three-dimensional or full three-dimensional fracturing design tool can be adopted, and the related data of the oil and gas reservoir obtained in the previous step is input into the design tool for simulation. The embodiments of the present application are not particularly limited with respect to the specific type of design tool.

Illustratively, 37 natural fractures are picked up in the whole well section, fracture opening is carried out by adopting pressure of 1.85SG, and no fracture opening is carried out under the condition of no leakage during actual drilling; gradually increasing the pressure, and when the pressure reaches 1.93SG, opening 4 natural cracks, wherein the crack opening rate is 11%; the pressure was increased gradually, and 25 natural cracks were opened at a pressure of 2.05SG, with a crack opening rate of 70%.

Here, it should be noted that: the natural fracture opening may be an extension of the natural fracture, may be a further increase in the width of the natural fracture, or may be another fracture opened on the axial side of the natural fracture, which is not limited herein. The unit of pressure SG may also be measured in g/cm 3.

And finally, determining the construction pressure according to the opening result and by combining parameters of the fracturing equipment and the stratum.

In practice, it is preferred to select a pressure for a high opening rate. However, the higher the pressure, the higher the demands on the fracturing equipment and the potential for damaging the formation and causing a hazard when fracturing. Therefore, parameters of the fracturing equipment in the actual fracturing work and parameters of the formations in the region need to be combined. Therefore, the determined construction pressure can not only achieve the purpose of successful fracturing, but also safely carry out fracturing.

The parameters of the fracturing equipment can be related parameters such as the pressure bearing capacity of a fracturing pipe column and a wellhead device, the friction resistance of fracturing fluid and the like, and the parameters of the stratum can be parameters such as stratum pressure and fracture extension pressure.

S309, performing fracture simulation according to the target construction pressure, the target perforation section and the target reservoir transformation mode to obtain at least one data of fracture parameters, preset yield and safety factors; and determining the construction range according to at least one data of the crack parameters, the preset yield and the safety factor.

In the specific implementation process, the logging data of the oil and gas reservoir, the reservoir modification mode, the perforation section and the construction pressure determined in the previous step can be input into the existing three-dimensional or full three-dimensional fracturing design tool for fracture simulation. In this way, the estimated fracture parameters (fracture length, fracture height, conductivity, etc.) can be obtained prior to actual fracturing. And then can combine to predetermine output and predetermine factor of safety, determine a reasonable construction scope. For example: if the flow conductivity of the crack is estimated to be poor, the construction range is expanded, and fracturing is carried out at multiple places.

Here, the preset production may be set according to production targets of oil and gas in different regions. The preset safety coefficient can be comprehensively evaluated from the aspects of ground stress, rock mechanics, sand production risk index and well-side reservoir distribution, and the embodiment of the application is not particularly limited.

S310, generating a modification template according to at least one of the logging data, the target reservoir modification mode, the target perforation section, the target construction pressure and the target construction range.

Wherein, the reconstruction template is used for guiding the reconstruction of the oil and gas reservoir.

After the well log data is obtained, the condition of the well producing the hydrocarbon reservoir can be determined. After determining the reservoir transformation mode, the perforation section, the construction pressure and the construction range, the reservoir transformation method and the construction method can know where, what mode and how much force to use for reservoir transformation. Like this, with logging data and the corresponding saving of reservoir transformation mode, perforation section, construction pressure, the scope of construction that determines, generate the transformation template, when other wells that are similar with the logging data of this well also need carry out reservoir transformation, just can refer to this transformation template and find the corresponding reservoir transformation mode, perforation section, construction pressure, the scope of construction of this well, and then carry out reservoir transformation to other wells, raise the efficiency. The difference between the logging data of other wells and the logging data of the target well is within an error range, and the difference can be the difference between one, some or all of the logging data.

It should be noted that, in the embodiment of the present application, the execution order of the above steps is not specifically limited.

According to the method, the instruction is obtained in response to the reservoir transformation mode, and the logging data of the oil and gas reservoir of the target well are obtained; determining the minimum level main stress, the brittleness index and the fracture toughness value of the oil and gas reservoir of the target well according to the logging data; then, determining the natural fracture surface stress in the oil and gas reservoir of the target well according to the logging data; then, determining the weights of the minimum level principal stress, the natural fracture surface stress, the brittleness index and the fracture toughness value; then, acquiring the fracturability index of the oil and gas reservoir of the target well according to the minimum level principal stress, the brittleness index, the fracture toughness value and the natural fracture surface stress, as well as the weight value of the minimum level principal stress, the weight value of the brittleness index, the weight value of the fracture toughness value and the weight value of the natural fracture surface stress; determining a target reservoir transformation mode corresponding to the fracturing index according to the corresponding relation between the preset fracturing index and the reservoir transformation mode; (ii) a And finally, carrying out reservoir transformation on the target well according to the transformation mode. And determining the perforation section, the construction pressure and the construction range to generate a modified template. Therefore, through the minimum horizontal principal stress, the natural fracture surface stress, the brittleness index, the fracture toughness and the weight of the fracture toughness of the oil and gas reservoir, the specific numerical value of the fracturing index in the oil and gas reservoir can be calculated, the actual condition of the oil and gas reservoir can be accurately determined according to the specific data of the fracturing index, a proper reservoir modification mode, a perforation section, construction pressure and construction range are found, a modification template is generated, the oil and gas reservoir is modified, and the yield and the recovery efficiency of a single well are improved.

Based on the same inventive concept, as the realization of the method, the embodiment of the application also provides a device for reforming the oil and gas reservoir.

Fig. 6 is a schematic structural diagram of a hydrocarbon reservoir reforming apparatus according to an embodiment of the present application. As shown in fig. 6, the apparatus 600 may include:

the obtaining module 601 is configured to obtain an instruction in response to a reservoir modification manner, and obtain logging data of an oil and gas reservoir of a target well;

a determining module 602, configured to determine, according to the logging data, a minimum level principal stress, a brittleness index, and a fracture toughness value of the hydrocarbon reservoir of the target well;

the processing module 603 is configured to obtain a fracturability index of the oil and gas reservoir of the target well according to the minimum level principal stress, the brittleness index, and the fracture toughness value, and a weight value of the minimum level principal stress, a weight value of the brittleness index, and a weight value of the fracture toughness value;

the determining module 602 is further configured to determine a target reservoir modification manner corresponding to the fracturability index according to a corresponding relationship between the preset fracturability index and the reservoir modification manner, where the target reservoir modification manner is used to modify an oil and gas reservoir of a target well.

It can be understood that the hydrocarbon reservoir transformation device provided in the embodiments of the present application may be used to implement the technical solution of any one of the above method embodiments, and the implementation principle and the technical effect are similar.

Optionally, the determining module 602 is further configured to determine a natural fracture surface stress in the hydrocarbon reservoir of the target well according to the logging data;

the obtaining module 601 is further configured to obtain a weight value of the natural fracture surface stress;

the processing module 603 is further configured to obtain a fracability index of the hydrocarbon reservoir of the target well according to the minimum level principal stress, the brittleness index, the fracture toughness value, the natural fracture surface stress, and the weight value of the minimum level principal stress, the weight value of the brittleness index, the weight value of the fracture toughness value, and the weight value of the natural fracture surface stress.

Optionally, the determining module 602 is specifically configured to determine, according to the logging data, a natural fracture surface normal stress and a natural fracture surface shear stress in the oil and gas reservoir of the target well;

Optionally, the determining module 602 is specifically configured to determine that the target reservoir transformation mode is a barite pollution-free acid fracturing transformation mode when the fracturability index is less than or equal to a first preset value and is greater than or equal to a second preset value;

Optionally, the determining module 602 is further configured to determine, according to the target reservoir modification manner, a target perforation segment corresponding to the target reservoir modification manner;

Optionally, the processing module 603 is further configured to perform fracture opening simulation according to the logging data, the target reservoir transformation manner, and the target perforation segment, and obtain at least one fracture opening result of the oil and gas reservoir of the target well corresponding to at least one construction pressure value;

the determining module 602 is further configured to determine a target construction pressure according to the at least one crack opening result.

Optionally, the processing module 603 is further configured to perform fracture simulation according to the target construction pressure, the target perforation segment and the target reservoir transformation mode, and obtain at least one data of fracture parameters, preset yield and safety factor;

the determining module 602 is further configured to determine a construction range according to at least one of the data of the crack parameter, the preset yield and the safety factor.

Optionally, the processing module 603 is further configured to generate a modification template according to at least one of the logging data, the target reservoir modification mode, the target perforation segment, the target construction pressure, and the target construction range, where the modification template is used to guide oil and gas reservoir modification.

Based on the same inventive concept, the embodiment of the application also provides the electronic equipment.

Fig. 7 is a schematic structural diagram of an electronic device according to an embodiment of the present application. As shown in fig. 7, the electronic device 700 according to the embodiment of the present application may be used to implement the method described in the foregoing method embodiment, and refer to the description in the foregoing method embodiment specifically.

Electronic device 700 includes a processing component 701 that further includes one or more processors, and memory resources, represented by memory 702, for storing instructions, such as application programs, that are executable by processing component 701. The application programs stored in memory 702 may include one or more modules that each correspond to a set of instructions. In addition, the processing component 701 is configured to execute the instructions to execute the method embodiments shown in fig. 2 and fig. 3, which refer to the description in the above method embodiments specifically, and are not described herein again.

The electronic device 700 may also include a wired or wireless network interface 703 configured to connect the electronic device 700 to a network, and an input-output (I/O) interface 704. The electronic device 700 may operate based on an operating system stored in the memory 702, such as Windows Server, Mac OS XTM, UnixTM, LinuxTM, FreeBSDTM, or the like.

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

It should be noted that, the electronic device provided above is used to implement the method described in the above method embodiment, and can achieve the same technical effect, and detailed descriptions of the same parts and beneficial effects as those of the method embodiment in this embodiment are not repeated herein. Based on the same inventive concept, the embodiment of the present application further provides a computer-readable storage medium, where the computer-readable storage medium includes a stored program, and when the program runs, the apparatus on which the storage medium is located is controlled to execute the method in one or more embodiments described above.

Here, it should be noted that: the above description of the computer-readable storage medium embodiments is similar to the description of the method embodiments described above, with similar beneficial effects as the method embodiments. For technical details not disclosed in the embodiments of the computer-readable storage medium of the embodiments of the present application, reference is made to the description of the method embodiments of the present application for understanding.

Based on the same inventive concept, the present application further provides a computer program product, which includes a computer program, and when the computer program is executed by a processor, the method for hydrocarbon reservoir reformation in the above method embodiments is implemented.

In the several embodiments provided, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, a division of a unit is merely a logical division, and an actual implementation may have another division, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

In addition, functional units in each embodiment may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.

The integrated unit implemented in the form of a software functional unit may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device) or a processor (in english: processor) to execute some steps of the methods according to the embodiments. And the aforementioned storage medium includes: a U disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other media capable of storing program codes.

In the above embodiments, it should be understood that the Processor may be a Central Processing Unit (CPU), other general-purpose processors, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), etc. The steps of a method disclosed in connection with the present disclosure may be embodied directly in a hardware processor, or in a combination of the two.

It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and so forth) having computer-usable program code embodied therein.

Claims

1. A method of hydrocarbon reservoir reformation, characterized in that the method comprises:

obtaining a fracability index of a hydrocarbon reservoir of the target well according to the minimum level principal stress, a brittleness index and a fracture toughness value, and a weight value of the minimum level principal stress, a weight value of the brittleness index and a weight value of the fracture toughness value;

and determining a target reservoir modification mode corresponding to the fracturing index according to the corresponding relation between the preset fracturing index and the reservoir modification mode, wherein the target reservoir modification mode is used for carrying out oil and gas reservoir modification on the target well.

2. The method of claim 1, wherein prior to obtaining the fracturability index of the hydrocarbon reservoir of the target well based on the minimum level principal stress, the brittleness index, and the fracture toughness value, and the weight value of the minimum level principal stress, the weight value of the brittleness index, and the weight value of the fracture toughness value, further comprises:

determining natural fracture face stress in a hydrocarbon reservoir of the target well from the logging data;

the obtaining the fracturability index of the hydrocarbon reservoir of the target well according to the minimum level principal stress, the brittleness index and the fracture toughness value, and according to the weight value of the minimum level principal stress, the weight value of the brittleness index and the weight value of the fracture toughness value comprises:

and obtaining the fracturing index of the oil and gas reservoir of the target well according to the minimum level principal stress, the brittleness index, the fracture toughness value, the natural fracture surface stress, the weight value of the minimum level principal stress, the weight value of the brittleness index, the weight value of the fracture toughness value and the weight value of the natural fracture surface stress.

3. The method of claim 2, wherein said determining from said well log data a natural fracture face stress in a hydrocarbon reservoir of said target well comprises:

determining natural fracture surface normal stress and natural fracture surface shear stress in the oil and gas reservoir of the target well according to the logging data;

4. The method according to any one of claims 1 to 3, wherein the determining of the target reservoir modification mode corresponding to the fracability index according to the correspondence between the preset fracability index and the reservoir modification mode comprises:

when the fracturability index is smaller than or equal to a first preset value and larger than or equal to a second preset value, determining that the target reservoir transformation mode is a barite pollution-free acid fracturing transformation mode;

when the fracturability index is smaller than a third preset value and is larger than or equal to a fourth preset value, determining that the target reservoir modification mode is a sand fracturing modification mode larger than a preset scale;

5. The method of claim 4, wherein after determining the target reservoir alteration pattern based on the correspondence between the fracability index and the reservoir alteration pattern, further comprising:

and when the target reservoir stratum modification mode is the sand fracturing modification mode, determining the target perforation section to be the periphery of a fracture development zone.

6. The method according to claim 5, wherein after determining the target perforation segment corresponding to the target reservoir reformation mode according to the target reservoir reformation mode, the method further comprises:

and determining the target construction pressure according to the at least one crack opening result.

7. The method of claim 6, wherein after determining a target construction pressure based on the at least one fracture initiation result, further comprising:

and determining a construction range according to at least one data of the crack parameters, the preset yield and the safety factor.

8. The method of claim 7, wherein after determining a construction range according to at least one of the fracture parameter, the preset production and the safety factor, further comprising:

and generating a modification template according to at least one data of the logging data, the target reservoir modification mode, the target perforation section, the target construction pressure and the target construction range, wherein the modification template is used for guiding the modification of the oil and gas reservoir.

9. A hydrocarbon reservoir reforming apparatus, the apparatus comprising:

the processing module is used for obtaining a fracturing index of a hydrocarbon reservoir of the target well according to the minimum level principal stress, the brittleness index and the fracture toughness value, and the weight value of the minimum level principal stress, the weight value of the brittleness index and the weight value of the fracture toughness value;

the determining module is further configured to determine a target reservoir modification mode corresponding to the fracturability index according to a corresponding relationship between a preset fracturability index and the reservoir modification mode, where the target reservoir modification mode is used for performing oil and gas reservoir modification on the target well.

10. An electronic device, comprising: a memory and a processor;

the memory is to store program instructions;

the processor is configured to invoke program instructions in the memory to perform the method of any of claims 1-8.

11. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon a computer program; the computer program, when executed, implements a hydrocarbon reservoir reforming method as defined in any one of claims 1-8.

12. A computer program product comprising a computer program, characterized in that the computer program, when being executed by a processor, carries out the method of hydrocarbon reservoir reformation according to any one of claims 1-8.