Oil and gas reservoir transformation method, device and equipment

Abstract

The oil and gas reservoir transformation method, device and equipment provided in the embodiment of the present application respond to the reservoir transformation method acquisition instruction to obtain the logging data of the oil and gas reservoir of the target well; then determine the minimum horizontal principal stress, brittleness index and fracture toughness value of the oil and gas reservoir of the target well based on the logging data; then obtain the fracturing index of the oil and gas reservoir of the target well based on the weight values ​​of the above parameters; finally, determine the target reservoir transformation method based on the correspondence between the preset fracturing index and the reservoir transformation method. In this scheme, the specific value of the fracturing index in the oil and gas reservoir can be calculated through the minimum horizontal principal stress, brittleness index and fracture toughness of the oil and gas reservoir and their weights, so that the actual situation of the oil and gas reservoir of the target well can be accurately determined, and then the corresponding production improvement transformation method of the oil and gas reservoir can be accurately determined, and finally the single well production can be increased.

Description

Technical Field

[0001] The present application relates to the technical field of oil and gas exploitation, and in particular to an oil and gas reservoir transformation method, device and equipment. Background Art

[0002] Rock formations that can store and permeate oil and gas are called oil and gas reservoirs. Currently, most oil and gas reserves come from sedimentary rock formations, among which sandstone and carbonate rocks are the most common. Since sandstone has the characteristics of heterogeneity, low porosity, low permeability, and high air flow resistance, the current oil and gas extraction in sandstone oil and gas reservoirs requires volume fracturing to form a complex, interconnected fracture network in the sandstone oil and gas reservoir, thereby maximizing the fracture volume and increasing the production of a single well.

[0003] The fracturing ability of sandstone oil and gas reservoirs is an important evaluation parameter in sandstone oil and gas development, and is crucial in determining the location of fracturing and whether fracturing is successful or not. The so-called fracturing ability of sandstone oil and gas reservoirs refers to the difficulty and development trend of fracturing crack extension under the sandstone oil and gas reservoir's own occurrence environment. In practical applications, the length of cracks formed under the same fracturing construction environment can be used to indicate the fracturing ability of sandstone oil and gas reservoirs. The longer the crack, the better the fracturing ability.

[0004] However, in the prior art, the fracturing property of sandstone oil and gas reservoirs is qualitatively evaluated based on the brittleness index of the sandstone oil and gas reservoirs, the horizontal principal stress difference index, the stress difference between the sandstone oil and gas reservoirs and the confining pressure, and whether microcracks are developed. Therefore, the fracturing property of the sandstone oil and gas reservoirs obtained is not accurate, which in turn affects the subsequent provision of accurate reservoir transformation methods, and ultimately results in low single well production. Summary of the invention

[0005] In view of the above problems, the purpose of the embodiments of the present application is to provide a method, device and equipment for oil and gas reservoir transformation, aiming to quantify the fracturing ability of oil and gas reservoirs, and then determine the accurate reservoir transformation method based on the quantified fracturing ability to increase the single well production.

[0006] In order to solve the above technical problems, the embodiments of the present application provide the following technical solutions:

[0007] In a first aspect, an embodiment of the present application provides a method for transforming an oil and gas reservoir, the method comprising:

[0008] In response to the reservoir transformation mode acquisition instruction, well logging data of the oil and gas reservoir of the target well is acquired;

[0009] Determine the minimum horizontal principal stress, brittleness index and fracture toughness value of the oil and gas reservoir of the target well based on the well logging data;

[0010] According to the minimum horizontal principal stress, the brittleness index, the fracture toughness value, and the weight value of the minimum horizontal principal stress, the weight value of the brittleness index, and the weight value of the fracture toughness value, the fracturing index of the oil and gas reservoir of the target well is obtained;

[0011] According to the correspondence between the preset fracturing index and the reservoir transformation method, the target reservoir transformation method corresponding to the fracturing index is determined, and the target reservoir transformation method is used to transform the oil and gas reservoir of the target well.

[0012] Optionally, before obtaining the fracturability index of the oil and gas reservoir of the target well according to the minimum horizontal principal stress, the brittleness index, the fracture toughness value, and the weight value of the minimum horizontal principal stress, the weight value of the brittleness index, and the weight value of the fracture toughness value, the method further includes:

[0013] Determine the natural fracture surface stress in the oil and gas reservoir of the target well based on the well logging data;

[0014] According to the minimum horizontal principal stress, the brittleness index, the fracture toughness value, and the weight value of the minimum horizontal principal stress, the weight value of the brittleness index, and the weight value of the fracture toughness value, the fracturing index of the oil and gas reservoir of the target well is obtained, including:

[0015] The fracturing index of the oil and gas reservoir of the target well is obtained according to the minimum horizontal principal stress, the brittleness index, the fracture toughness value, the natural fracture surface stress, and the weight value of the minimum horizontal 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.

[0016] Optionally, determining the natural fracture surface stress in the oil and gas reservoir of the target well based on the well logging data includes:

[0017] Determine the normal stress and shear stress of the natural fracture surface in the oil and gas reservoir of the target well according to the well logging data;

[0018] The natural fracture surface stress in the oil and gas reservoir of the target well is determined 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.

[0019] Optionally, according to the correspondence between the preset fracturability index and the reservoir transformation method, determining the target reservoir transformation method corresponding to the fracturability index includes:

[0020] When the fracturability index is less than or equal to the first preset value and greater than or equal to the second preset value, determining that the target reservoir transformation method is a barite decontamination acid fracturing transformation method;

[0021] When the fracturability index is less than the second preset value and greater than or equal to the third preset value, determining that the target reservoir reconstruction method is a sand fracturing reconstruction method smaller than the preset scale;

[0022] When the fracturability index is less than the third preset value and greater than or equal to the fourth preset value, determining that the target reservoir reconstruction method is a sand fracturing reconstruction method greater than a preset scale;

[0023] When the fracturability index is less than a fourth preset value, determining whether to perform sand fracturing on the reservoir near the wellbore according to the development of the reservoir near the wellbore;

[0024] Among them, the first preset value is greater than the second preset value, the second preset value is greater than the third preset value, and the third preset value is greater than the fourth preset value.

[0025] Optionally, after determining the target reservoir transformation method according to the correspondence between the fracturability index and the reservoir transformation method, the method further includes:

[0026] According to the target reservoir transformation method, determine the target perforation section corresponding to the target reservoir transformation method;

[0027] Among them, when the target reservoir transformation method is barite decontamination acid fracturing transformation, the target perforation section is determined to be the fracture development zone;

[0028] When the target reservoir transformation method is the sand fracturing transformation method, the target perforation section is determined to be the periphery of the fracture development zone.

[0029] Optionally, after determining the target perforation section corresponding to the target reservoir stimulation method according to the target reservoir stimulation method, the method further includes:

[0030] Perform fracture opening simulation according to the well logging data, the target reservoir transformation method 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;

[0031] The target construction pressure is determined according to at least one crack opening result.

[0032] Optionally, after determining the target construction pressure according to at least one crack opening result, the method further includes:

[0033] Perform fracture simulation according to target construction pressure, target perforation section and target reservoir reconstruction method to obtain at least one of fracture parameters, preset production and safety factor;

[0034] The construction scope is determined based on at least one of the crack parameters, preset production and safety factor.

[0035] Optionally, after determining the construction scope according to at least one of the crack parameters, the preset yield and the safety factor, the following steps are further included:

[0036] A transformation template is generated according to at least one of the logging data, the target reservoir transformation method, the target perforation section, the target construction pressure, and the target construction range. The transformation template is used to guide the oil and gas reservoir transformation.

[0037] In a second aspect, an embodiment of the present application provides an oil and gas reservoir transformation device, the device comprising:

[0038] An acquisition module, for acquiring well logging data of an oil and gas reservoir of a target well in response to a reservoir transformation mode acquisition instruction;

[0039] A determination module, used to determine the minimum horizontal principal stress, brittleness index and fracture toughness value of the oil and gas reservoir of the target well according to the well logging data;

[0040] A processing module, which obtains a fracturability index of an oil and gas reservoir of a target well according to the minimum horizontal principal stress, the brittleness index, the fracture toughness value, and the weight value of the minimum horizontal principal stress, the weight value of the brittleness index, and the weight value of the fracture toughness value;

[0041] The determination module is also used to determine the target reservoir transformation method corresponding to the fracturing index according to the corresponding relationship between the preset fracturing index and the reservoir transformation method, and the target reservoir transformation method is used to transform the oil and gas reservoir of the target well.

[0042] In a third aspect, an embodiment of the present application provides an electronic device, the electronic device comprising:

[0043] Memory and processor;

[0044] The memory is used to store program instructions;

[0045] The processor is used to call the program instructions in the memory to execute the method described in the first aspect.

[0046] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium having a computer program stored thereon; when the computer program is executed, the oil and gas reservoir transformation method described in the first aspect is implemented.

[0047] In a fifth aspect, an embodiment of the present application provides a computer program product, including a computer program. When the computer program is executed by a processor, it implements the oil and gas reservoir transformation method as described in the first aspect.

[0048] The oil and gas reservoir transformation method, device and equipment provided in the embodiment of the present application respond to the reservoir transformation method acquisition instruction to obtain the logging data of the oil and gas reservoir of the target well; then determine the minimum horizontal principal stress, brittleness index and fracture toughness value of the oil and gas reservoir of the target well based on the logging data; then obtain the fracturing index of the oil and gas reservoir of the target well based on the weight values ​​of the above parameters; finally, determine the target reservoir transformation method based on the correspondence between the preset fracturing index and the reservoir transformation method. In this scheme, the specific value of the fracturing index in the oil and gas reservoir can be calculated through the minimum horizontal principal stress, brittleness index and fracture toughness of the oil and gas reservoir and their weights, so that the actual situation of the oil and gas reservoir of the target well can be accurately determined, and then the corresponding production improvement transformation method of the oil and gas reservoir can be accurately determined, and finally the single well production can be increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] 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 present application.

[0050] Figure 1 A schematic diagram of a scenario of an oil and gas reservoir transformation method provided in an embodiment of the present application;

[0051] Figure 2 A flow chart of a method for transforming an oil and gas reservoir provided in one embodiment of the present application;

[0052] Figure 3 A flow chart of an oil and gas reservoir transformation method provided in another embodiment of the present application;

[0053] Figure 4 A schematic diagram of the natural fracture trends of the oil and gas reservoir of the target well provided in an example of an embodiment of the present application;

[0054] Figure 5 A schematic diagram of the relationship between the natural fracture orientation and the maximum horizontal principal stress angle and the number of natural fractures in the oil and gas reservoir of a target well provided in one embodiment of the present application;

[0055] Figure 6 A schematic diagram of the structure of an oil and gas reservoir transformation device provided in one embodiment of the present application;

[0056] Figure 7 A schematic diagram of the structure of an electronic device provided in one embodiment of the present application.

[0057] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0058] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0059] Rock formations that can store and permeate oil and gas are called oil and gas reservoirs. Currently, most oil and gas reserves come from sedimentary rock formations, among which sandstone and carbonate rocks are the most common. Among them, sandstone oil and gas reservoirs refer to sandstone oil and gas reservoirs located below 6,000 meters underground. Since the sandstone oil and gas reservoirs are deep, the porosity and permeability are low, which leads to low single well production. Therefore, it is necessary to transform the sandstone oil and gas reservoirs to increase the single well production.

[0060] In actual application scenarios, the sandstone oil and gas reservoir transformation method is mainly used in the completion and oil testing transformation of sandstone oil and gas reservoirs. That is to say, after the well is drilled, the sandstone oil and gas reservoir is tested for oil and gas, and then the sandstone oil and gas reservoir is transformed according to the test results.

[0061] Since sandstone has the characteristics of heterogeneity, low porosity, low permeability, and large air flow resistance, the current transformation of sandstone oil and gas reservoirs mainly includes: volume fracturing of the oil and gas reservoirs, so that a complex and interconnected fracture network is formed in the sandstone oil and gas reservoirs, thereby maximizing the fracture volume and increasing the single well production.

[0062] Therefore, the fracturing property of sandstone oil and gas reservoirs is an important evaluation parameter in sandstone oil and gas development, and is crucial in determining the fracturing location and the success of fracturing. The so-called fracturing property of sandstone oil and gas reservoirs refers to the difficulty and development trend of fracturing crack extension under the sandstone oil and gas reservoir's own occurrence environment. In practical applications, the fracturing property of sandstone oil and gas reservoirs can be expressed by the length of cracks formed under the same fracturing construction environment. The longer the crack, the better the fracturing property.

[0063] However, in the prior art, the fracturing ability of sandstone oil and gas reservoirs is qualitatively evaluated based on the brittleness index of the sandstone oil and gas reservoirs, the horizontal principal stress difference index, the stress difference between the sandstone oil and gas reservoirs and the confining pressure, and whether microcracks are developed. Therefore, the fracturing ability of the sandstone oil and gas reservoirs obtained is not accurate, which in turn affects the subsequent provision of accurate reservoir transformation methods.

[0064] In view of this, the embodiment of the present application provides a method for transforming an oil and gas reservoir, which determines the minimum horizontal principal stress, brittleness index and fracture toughness value of the oil and gas reservoir of the target well according to the well logging data of the target well; then obtains the fracturing index of the oil and gas reservoir of the target well according to the weight values ​​of the above parameters; finally, determines the transformation method of the target reservoir according to the preset fracturing index. Since the specific value of the fracturing index in the oil and gas reservoir can be calculated through the minimum horizontal principal stress, brittleness index and fracture toughness of the oil and gas reservoir and their weights, the actual situation of the oil and gas reservoir of the target well can be accurately determined, and then the corresponding production improvement transformation method of the oil and gas reservoir can be accurately determined, and finally the single well production can be increased.

[0065] Figure 1 A schematic diagram of a scenario of an oil and gas reservoir transformation method provided in an embodiment of the present application. Figure 1 As shown, the scenario includes: a terminal device 101 and a server 102 .

[0066] In the embodiment of the present application, the terminal device 101 can be any terminal, for example, it can be a user equipment of machine type communication. The terminal device 101 can also be referred to as user equipment (UE), mobile station (MS), mobile terminal (mobile terminal), terminal (terminal), etc. For example, the terminal example can be a desktop computer, a notebook, a personal digital assistant (PDA), a smart phone, a tablet computer and other devices. This scenario is illustrated by taking a desktop computer as an example. It should be noted that the number of terminal devices 101 can be multiple, and the embodiment of the present application is illustrated by taking one as an example.

[0067] Server 102 may include a business point that provides processing, database, and communication facilities. Server 102 may be a monolithic server or a distributed server across multiple computers or computer data centers. Server 102 may be of various types, such as, but not limited to, a network server, a message server, an application server, an interactive server, a database server, or a proxy server.

[0068] The terminal device 101 can communicate with the server 102 via a wireless or wired network to send instructions to the server 101. The wireless network can be a communication network such as 2G, 3G, 4G, or 5G, or a wireless local area network, which is not limited here.

[0069] In actual application, the user may trigger the oil and gas reservoir transformation method acquisition instruction on the terminal device 101, but after the server 102 receives the oil and gas reservoir transformation method acquisition instruction, it determines the oil and gas reservoir transformation method according to the instruction.

[0070] Specifically, the server 102 obtains the logging data of the oil and gas reservoir of the target well. On the 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 sending the instruction; on the other hand, the server 102 can also obtain the logging data in the network according to the identification information of the target well in the instruction after receiving the instruction for obtaining the oil and gas reservoir transformation method, which is not specifically limited in the embodiment of the present application.

[0071] Furthermore, the server 102 obtains the oil and gas reservoir of the target well according to the well logging data, and then determines the target reservoir transformation method corresponding to the fracturing index according to the corresponding relationship between the preset fracturing index and the reservoir transformation method.

[0072] Optionally, after the server 102 determines the oil and gas reservoir transformation method, the determined oil and gas reservoir transformation method may also be sent to the terminal device 101 for displaying the determined transformation method to the user.

[0073] In this scheme, since the specific value of the fracturability index in the oil and gas reservoir can be calculated through the minimum horizontal principal stress, brittleness index and fracture toughness and their weights of the oil and gas reservoir, the actual situation of the oil and gas reservoir of the target well can be accurately determined, and then the corresponding production improvement and transformation method of the oil and gas reservoir can be accurately determined, ultimately increasing the single well production.

[0074] Figure 2 A flow chart of a method for transforming an oil and gas reservoir provided in one embodiment of the present application is shown in FIG. Figure 2 As shown, the method may include:

[0075] S201. In response to a reservoir transformation method acquisition instruction, well logging data of an oil and gas reservoir of a target well is acquired.

[0076] Here, the logging data may be collected from drilling engineering data, or may be directly measured in the target well using a logging instrument, and the embodiments of the present application do not make specific limitations.

[0077] Specifically, logging data may include: natural gamma, natural potential, well diameter, formation resistivity, formation density, conventional sound waves, imaging data, shear wave data, etc. Since rocks generally contain different amounts of radioactive elements and emit radiation continuously, the lithology, physical properties, oil and gas content, and brine mineralization of the rock formation can be obtained by measuring the natural gamma ray intensity of the rock formation along the wellbore.

[0078] Among them, the natural potential is the electrode potential of the metal in the corrosion system without the influence of external current. According to the detection results of the natural potential, the corrosion of the metal pipeline passing through the place can be judged, and the surrounding rock environment can be evaluated. The wellbore diameter is the diameter of the drilling wellbore. The formation resistivity is the resistivity of the rock measured by the power supply electrodes and measuring electrodes arranged in different parts of the borehole. Since the resistivity of oil and gas underground is a physical quantity that can neither be directly observed nor directly measured, it can only be indirectly measured when the current passes through it. Therefore, it is necessary to pass a certain current into the rock formation to indirectly obtain the resistivity of oil and gas. By analyzing the emitted gamma rays, the formation density can be measured. By using conventional sound waves to propagate in the rock, the geological planing surface under the well can be measured through changes in the speed, amplitude, frequency, etc. of the sound waves. According to the observation of the geophysical field in the borehole, the physical parameters of the well wall and the objects around the well are imaged, and imaging data can be obtained. A dipole acoustic wave source is used to increase the pressure on one side of the wellbore wall and reduce the pressure on the other side, thereby causing disturbances in the wellbore wall and forming slight deflections, which directly stimulate longitudinal and transverse waves in the formation, enabling the identification of lithology and division of fracture zones.

[0079] S202. Determine the minimum horizontal principal stress, brittleness index and fracture toughness value of the oil and gas reservoir of the target well based on the well logging data.

[0080] Specifically, after obtaining the logging data, the pore pressure, rock mechanical parameters, ground stress and other data of the oil and gas reservoir of the target well can be calculated based on the logging data, and then the minimum horizontal principal stress, brittleness index and fracture toughness of the oil and gas reservoir can be calculated. The above calculation can adopt the existing conventional calculation method, so it will not be repeated here.

[0081] The minimum horizontal principal stress here refers to the minimum principal stress in the horizontal direction of the oil and gas reservoir. If the force used for drilling is less than the minimum horizontal principal stress, it is impossible to drill a crack.

[0082] The brittleness index refers to the amount of deformation that only a small amount of oil and gas reservoirs produce under the action of external forces (such as stretching, impact, etc.). Fracture toughness refers to the impedance value when fracture occurs in the presence of cracks or quasi-cracks. Among them, the greater the fracture toughness, the lower the possibility of further cracking. These are all related to whether the oil and gas reservoir can be successfully fractured. The higher the brittleness index, the lower the fracture toughness, the lower the compressive strength (that is, the lower the minimum horizontal principal stress), and the easier it is to successfully fracture.

[0083] The embodiment of the present application does not specifically limit the method for obtaining the brittleness index. As an optional solution, the static Young's modulus and Poisson's ratio of the oil and gas reservoir can be obtained based on the logging data, and then the brittleness index can be obtained based on the static Young's modulus and Poisson's ratio of the oil and gas reservoir.

[0084] Among them, the static Young's modulus is a physical quantity that describes the ability of a solid material to resist deformation under a certain external force. Poisson's ratio refers to the ratio of the absolute value of the lateral normal strain to the axial normal strain when the material is subjected to unidirectional tension or compression. The static Young's modulus and Poisson's ratio here can be obtained directly or indirectly from well logging data, and there is no limitation here.

[0085] Furthermore, the static Young's modulus and Poisson's ratio are normalized respectively to facilitate the subsequent calculation of the brittleness index, and then to facilitate the calculation of the fracturing index. Finally, the brittleness index of the oil and gas reservoir is obtained according to the sum of the normalized static Young's modulus and Poisson's ratio.

[0086] Specifically, the static Young's modulus can be normalized by using the following formula (1):

[0087] E Brit =(EE min ) / (E max -E min )×100 formula (1)

[0088] Among them, E 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, and E max and E min are the maximum and minimum values ​​of the static Young's modulus within the depth range of the above depths, respectively.

[0089] It should be noted here that normalizing the static Young's modulus can avoid large errors in calculating the static Young's modulus due to fluctuations generated during measurement, thereby improving the accuracy of the static Young's modulus.

[0090] Optionally, the Poisson's ratio can be normalized using the following formula (2):

[0091] μ Brit =(μ max -μ) / (μ max -μ min )×100 formula (2)

[0092] Among them, μ Brit is the normalized Poisson’s ratio, E is the Poisson’s ratio at a certain depth in the oil and gas reservoir, μ max and μ min are the maximum and minimum values ​​of Poisson's ratio within the depth range mentioned above, respectively.

[0093] It should be noted here that normalizing the Poisson's ratio can avoid large errors in calculating the Poisson's ratio due to fluctuations in measurement, thereby improving the accuracy of the Poisson's ratio.

[0094] Furthermore, by summing the normalized static Young's modulus and Poisson's ratio, the brittleness index can be obtained using the following formula (3):

[0095] I b =m·E Brit +n·μ Brit Formula (3)

[0096] Among them, I b is the brittleness index, E Brit is the normalized static Young's modulus, μ Brit is the normalized Poisson's ratio.

[0097] It should be noted here that: E in formula (3) Brit and μ Brit The coefficients before can be adjusted according to actual conditions, and are not limited in the embodiments of the present application. For example, the values ​​of m and n can be 0.5.

[0098] S203. Obtain the fracturability index of the oil and gas reservoir of the target well according to the minimum horizontal principal stress, the brittleness index, the fracture toughness value, and the weight value of the minimum horizontal principal stress, the weight value of the brittleness index, and the weight value of the fracture toughness value.

[0099] First, the weight value of the minimum horizontal principal stress, the weight value of the brittleness index, and the weight value of the fracture toughness value are determined.

[0100] Specifically, after determining the minimum horizontal principal stress, brittleness index and fracture toughness of the oil and gas reservoir, it is necessary to assign corresponding weights to the minimum horizontal principal stress, brittleness index and fracture toughness values. In other words, it is necessary to determine the degree of influence of the minimum horizontal principal stress, brittleness index and fracture toughness value on the fracturing process of the oil and gas reservoir.

[0101] Generally speaking, the weights can be expressed in the form of percentages, integers or decimals, where the decimals can be decimals greater than 0 and less than 1. Of course, the weights can also be expressed in other forms, which will not be listed here.

[0102] In the specific implementation process, the weight of the minimum horizontal principal stress, the weight of the brittleness index and the weight of the fracture toughness value can be determined according to the previous experience of the area where the oil and gas reservoir is located; or they can be set to the same value first, and then adjusted according to the actual effect of subsequent fracturing. The specific method for determining the weights of the minimum horizontal principal stress, the brittleness index and the fracture toughness is not specifically limited in the embodiments of the present application. It should be noted here that if the weights are set to the same value in advance, the sum of the weights can be made 1. In this way, it is beneficial to control the numerical range of the subsequent fracturing index. By controlling the numerical range of the fracturing index within a certain range, it is possible to clearly formulate corresponding transformation methods for different fracturing indices, and thus it is possible to more clearly transform the oil and gas reservoir.

[0103] Furthermore, according to the minimum horizontal principal stress, the brittleness index, the fracture toughness value, and the weight value of the minimum horizontal principal stress, the weight value of the brittleness index, and the weight value of the fracture toughness value, the fracturing index of the oil and gas reservoir is obtained through the linear weighted sum method.

[0104] 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 value, the brittleness index of the oil and gas reservoir is multiplied by the weight value of the brittleness index to obtain a second value, and 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 value, and then the first value, the second value, and the third value are added together, and the sum obtained is the fracturing index of the oil and gas reservoir. Through the above algorithm, an accurate fracturing index can be obtained based on the minimum horizontal principal stress, brittleness index, and fracture toughness value, so that the position in the oil and gas reservoir that is easy to be fractured can be found according to the fracturing index of the oil and gas reservoir, which is conducive to successful fracturing and improves the production of a single well.

[0105] The fracturing index here is a specific value that can more accurately characterize the difficulty of fracturing at various locations in the oil and gas reservoir. It can help explorers find the fracturing location more accurately, thereby improving the success rate of fracturing and increasing the production of a single well.

[0106] S204: Determine a target reservoir transformation method corresponding to the fracturability index according to a preset correspondence between the fracturability index and the reservoir transformation method.

[0107] Among them, the target reservoir transformation method is used to transform the oil and gas reservoir of the target well.

[0108] Since the area of ​​oil and gas reservoirs is large, there are differences between the logging data of different small areas, which leads to different fracturing indexes of each well corresponding to the oil and gas reservoirs. Therefore, different reservoir transformation methods can be formulated for different fracturing indexes. After determining the fracturing index of each well, the corresponding target reservoir transformation method can be quickly determined through the preset corresponding relationship, thereby improving the efficiency of single well transformation.

[0109] Specifically, the embodiment of the present application specifically defines the layout of the correspondence between the preset fracturing index and the reservoir transformation method. For example, the oil and gas reservoirs can be divided into different types of reservoirs, and each type of reservoir corresponds to a range of fracturing indexes. The ranges of the fracturing indexes of different types of reservoirs are different, and the ranges of the fracturing indexes of various types of reservoirs are connected end to end to include all possible fracturing indexes of oil and gas reservoirs. And according to the characteristics of each type of reservoir, the corresponding reservoir transformation method is pre-set. In this way, a correspondence between fracturing index-reservoir type-reservoir transformation method is formed.

[0110] In the specific implementation process, after calculating the fracturability index of the oil and gas reservoir, the fracturability index range is found in the above correspondence, and then the reservoir type is determined, and then the corresponding target reservoir transformation method is found. In this way, the oil and gas reservoir can be transformed by the corresponding target reservoir transformation method, thereby increasing the single well production.

[0111] As can be seen from the above content, the oil and gas reservoir transformation method provided in the embodiment of the present application obtains the well logging data of the oil and gas reservoir of the target well in response to the reservoir transformation method acquisition instruction; then, based on the well logging data, the minimum horizontal principal stress, brittleness index and fracture toughness value of the oil and gas reservoir of the target well are determined; then, based on the weight values ​​of the above parameters, the fracturing index of the oil and gas reservoir of the target well is obtained; finally, based on the correspondence between the preset fracturing index and the reservoir transformation method, the target reservoir transformation method is determined. In this scheme, the specific value of the fracturing index in the oil and gas reservoir can be calculated through the minimum horizontal principal stress, brittleness index and fracture toughness of the oil and gas reservoir and their weights, so that the actual situation of the oil and gas reservoir of the target well can be accurately determined, and then the corresponding production improvement transformation method of the oil and gas reservoir can be accurately determined, and finally the single well production can be increased.

[0112] Figure 3 This is a flow chart of an oil and gas reservoir transformation method provided by another embodiment of the present application. Based on the above embodiment, this embodiment describes the above embodiment in more detail. Figure 3 As shown, the oil and gas reservoir transformation method provided in the embodiment of the present application may include the following steps:

[0113] S301. In response to a reservoir transformation method acquisition instruction, well logging data of an oil and gas reservoir of a target well is acquired.

[0114] Among them, the implementation method of this step is Figure 2 The implementation method and beneficial effects of step 201 in the illustrated embodiment are the same, and specific reference may be made to Figure 2 The embodiments shown will not be described in detail here.

[0115] S302. Determine the minimum horizontal principal stress, brittleness index and fracture toughness value of the oil and gas reservoir of the target well based on the well logging data.

[0116] Among them, the minimum horizontal principal stress, brittleness index and fracture toughness in this step are Figure 2 The method for obtaining the minimum horizontal principal stress, brittleness index and fracture toughness value in step S102 of the embodiment shown is the same, and the specific method can be referred to Figure 2 The embodiments shown will not be described in detail here.

[0117] S303. Determine the natural fracture surface stress in the oil and gas reservoir of the target well according to the well logging data.

[0118] Here we mainly explain the natural fracture surface stress. Since there are natural fractures in the oil and gas reservoirs, that is, fractures that exist naturally and are not artificially fractured, when transforming the oil and gas reservoirs, taking the natural fractures into consideration can not only connect the natural fractures with the artificial fractures to form a complex fracture network, which is conducive to oil and gas penetration, but also can perform fracturing on the basis of the natural fractures, thereby improving the success rate and effect of fracturing.

[0119] Generally speaking, the greater the stress on the natural fracture surface, the greater the possibility of further cracking of the natural fracture surface after artificial fracturing.

[0120] The embodiment of the present application does not specifically limit the scheme for obtaining the stress of the natural fracture surface. As an optional scheme, the normal stress and shear stress of the natural fracture surface can be obtained based on the logging data. The normal stress and shear stress of the natural fracture surface here can be obtained directly from the logging data or indirectly from the logging data, which is not limited here.

[0121] Furthermore, after obtaining the normal stress and shear stress of the natural fracture surface, the natural fracture surface stress can be calculated using the following formula (4).

[0122]

[0123] Among them, σ ne , σ ne max , σ ne min are the normal stress on the natural fracture surface and its maximum and minimum values ​​within the corresponding depth range, respectively, and τ is the shear stress on the natural fracture surface.

[0124] It should be noted here that the area of ​​the oil and gas reservoir is large, and the area where the natural fracture surface is located may also be large. For the same natural fracture surface, the normal stress at different locations will be different. Therefore, when calculating the normal stress at a certain point on the natural fracture surface, it is necessary to normalize it with the normal stress at its surroundings to avoid incorrect calculation of the natural fracture surface stress at that location due to measurement errors at a certain location.

[0125] S304. Determine the weights of the minimum horizontal principal stress, natural fracture surface stress, brittleness index and fracture toughness value.

[0126] The method for determining the weight of the minimum horizontal principal stress, the weight of the natural fracture surface stress, the weight of the brittleness index and the weight of the fracture toughness value in this step is the same as Figure 2 The scheme in step S202 in the illustrated embodiment is similar. The only difference is that the sum of the weight of the minimum horizontal principal stress, the weight of the natural fracture surface 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 horizontal 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 be set to the same value, that is, all 0.25, and then adjusted according to different experiences in different regions.

[0127] S305. Obtain the fracturability index of the oil and gas reservoir of the target well according to the minimum horizontal principal stress, the brittleness index, the fracture toughness value, the natural fracture surface stress, and the weight value of the minimum horizontal 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.

[0128] 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 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 value, the brittleness index of the oil and gas reservoir is multiplied by the weight of the brittleness index to obtain a third value, and the fracture toughness of the oil and gas reservoir is multiplied by the weight of the fracture toughness to obtain a fourth value, and then these four values ​​are added together, and the sum obtained is the fracturing index of the oil and gas reservoir. In this scheme, the position in the oil and gas reservoir that is easy to be fractured can be found according to the fracturing index of the oil and gas reservoir, which is conducive to the success of fracturing and the increase of single well production.

[0129] As an alternative, the fracturing index of the oil and gas reservoir can be calculated according to the following formula (5):

[0130]

[0131] Among them, I f is the fracturing index of oil and gas reservoirs, σ h , σ h max , σh min are the minimum horizontal principal stress of the oil and gas reservoir and its maximum and minimum values ​​within the corresponding depth range, I b ,I b max ,I b min are the brittleness index of the oil and gas reservoir and its maximum and minimum values ​​within the corresponding depth range, K IC , K IC max , K IC min are the maximum and minimum values ​​of the fracture toughness of oil and gas reservoirs and their corresponding depth ranges, respectively; W1, W2, W3, and W4 are the weights of the minimum horizontal principal stress, natural fracture surface stress, brittleness index, and fracture toughness value, respectively.

[0132] It should be noted that the above static Young's modulus, Poisson's ratio, brittleness index and fracturing index are dimensionless, and the unit of the above fracture toughness is generally MPa·m 1 / 2 The unit of the above-mentioned minimum horizontal principal stress and crack surface stress is generally MPa.

[0133] The fracturing index here is a specific value that can more accurately characterize the difficulty of fracturing at various locations in the oil and gas reservoir. It can help explorers find the fracturing location more accurately, thereby improving the success rate of fracturing and increasing the production of a single well.

[0134] S306. Determine a target reservoir transformation method corresponding to the fracturability index according to a preset correspondence between the fracturability index and the reservoir transformation method.

[0135] In the specific implementation process, the oil and gas reservoirs can be divided into four categories: the first type of reservoir, the second type of reservoir, the third type of reservoir and the fourth type of reservoir. Each type of reservoir corresponds to a range of fracturing index. For example: in the first type of reservoir, the second preset value ≤ fracturing index ≤ the first preset value; in the second type of reservoir, the third preset value ≤ fracturing index < the second preset value; in the third type of reservoir, the fourth preset value ≤ fracturing index < the third preset value; in the fourth type of reservoir, the fracturing index < the fourth preset value.

[0136] Among them, the fourth preset value ≤ the third preset value ≤ the second preset value ≤ the first preset value.

[0137] Furthermore, the transformation method of each type of oil and gas reservoir is determined according to the following methods:

[0138] (1) For the first type of reservoir, that is, when the fracturability index is less than or equal to the first preset value and greater than or equal to the second preset value, it can be determined that the target reservoir transformation method is the barite decontamination acid fracturing transformation method, and the well here can be a vertical well or a horizontal well;

[0139] (2) For the second type of reservoir, that is, when the fracturability index is less than the second preset value and greater than or equal to the third preset value, the target reservoir reconstruction method is determined to be a sand fracturing reconstruction method smaller than the preset scale;

[0140] (3) For the third type of reservoir, that is, when the fracturability index is less than the third preset value and greater than or equal to the fourth preset value, the target reservoir reconstruction method is determined to be a sand fracturing reconstruction method greater than the preset scale;

[0141] (4) For the fourth type of reservoir, that is, when the fracturing index is less than the fourth preset value, the well corresponding to the fracturing index is not suitable for transformation. In this case, it is possible to consider whether to side-drill based on the development of the reservoir near the wellbore, and to increase production by transformation based on side-drilling.

[0142] Specifically, whether to perform sand fracturing on the near-wellbore reservoir can be determined based on the development of the near-wellbore reservoir.

[0143] On the one hand, when the development of the reservoir near the wellbore meets the preset development standard, it is determined to perform sand fracturing on the reservoir near the wellbore;

[0144] On the other hand, when the development of the reservoir near the wellbore does not meet the preset development standard, it is determined not to perform sand fracturing on the reservoir near the wellbore.

[0145] In the specific implementation process, when the development of the near-well reservoir meets the preset development standard, it means that more oil and gas can be obtained by transforming the near-well reservoir, so it is determined to perform sand fracturing on the near-well reservoir; when the development of the near-well reservoir does not meet the preset development standard, it means that more oil and gas cannot be obtained even if the near-well reservoir is transformed, so it is determined not to perform sand fracturing on the near-well reservoir to reduce useless transformation work.

[0146] It should be noted that the preset development standard refers to the predicted development of the well-developed near-well reservoir. The preset development standard can be determined according to the actual conditions of different regions. In areas with low oil and gas production, the preset development standard can be set lower; in areas with high oil and gas production, the preset development standard can be set higher. The specific setting rules of the preset development standard are not limited here.

[0147] In addition to determining the reservoir transformation method based on the fracturing index, it is also necessary to make a comprehensive judgment based on factors such as the oil and gas displays, physical properties, lithology, distance from faults, and distance from water layers of the oil and gas reservoir.

[0148] In practical applications, the embodiments of the present application do not specifically limit the sizes of 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 actual conditions, which is not limited here.

[0149] It should also be noted that when performing sand fracturing, being smaller than the preset scale and being larger than the preset scale are relative. The preset scale is not a specific and fixed scale. The preset scale can be flexibly changed according to the actual situation of the oil and gas reservoirs in the region. In addition, the near-well reservoir refers to the oil and gas reservoir that is closer to the wellhead. If the well corresponding to the fracturing index is not suitable for transformation, and there is an oil and gas reservoir near the well, then side drilling can be adopted for the near-well reservoir, and then sand fracturing can be carried out to increase oil and gas production.

[0150] S307. According to the target reservoir transformation method, determine the target perforation section corresponding to the target reservoir transformation method.

[0151] Among them, when the target reservoir transformation method is barite decontamination acid fracturing transformation, the target perforation section is determined to be the fracture development zone;

[0152] When the target reservoir transformation method is the sand fracturing transformation method, the target perforation section is determined to be the periphery of the fracture development zone.

[0153] That is to say, when the fracturability index of the target well is between 0.6-1, it is determined to adopt the acid fracturing reservoir transformation method, and then when the reservoir transformation is carried out specifically, the fracture development zone is mainly perforated, and the recommended fracture opening degree is 50%-60%. When the fracturability index of the target well is between 0.4-0.6 or 0.2-0.4, it is determined to adopt the sand fracturing reservoir transformation method, and then when the reservoir transformation is carried out specifically, the fracture development zone is mainly perforated, and the recommended fracture opening degree is 30%-40%.

[0154] S308, performing fracture opening simulation according to the well logging data, the target reservoir transformation method and the target perforation section, obtaining 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 the at least one fracture opening result.

[0155] First, the collapse orientation of the target well can be estimated through the logging data of the oil and gas reservoir of the target well, and then the regional principal stress orientation can be determined (such as: about 110° south-east, approximately east-west, etc.), and then the triaxial geostress of the well can be inverted (such as: the minimum horizontal principal stress is about 2.17MPa / 100m, the vertical stress is about 2.45MPa / 100m, and the maximum horizontal principal stress is about 2.61-2.71MPa / 100m). In this way, Young's modulus, Poisson's ratio, compressive strength, fracturability index, etc. can be further calculated.

[0156] Then, all the natural fractures in the oil and gas reservoir can be picked out through the imaging data in the logging data of the oil and gas reservoir, and then the angle between the direction of the natural fractures and the orientation of the maximum principal stress can be determined in combination with the triaxial geostress.

[0157] For example, Figure 4 A schematic diagram of the natural fracture orientation of the oil and gas reservoir of the target well provided in one embodiment of the present application. Figure 4 As shown, 37 natural fractures can be extracted from the imaging data of the target well. The inclination angle of the natural fractures is mainly 60°-80°, and the main trend is 100°-130° in the southeast direction.

[0158] For example, Figure 5 A schematic diagram of the relationship between the natural fracture orientation and the maximum horizontal principal stress angle and the number of natural fractures in the oil and gas reservoir of a target well provided in one embodiment of the present application.

[0159] like Figure 5 As shown, there are 7 natural fractures whose strike angles with the maximum horizontal principal stress are between 15° and 45°, accounting for 19% of the total.

[0160] Next, based on the previously obtained data such as the angle between the direction of the natural fracture and the orientation of the maximum principal stress, the reservoir transformation method, the perforation section, etc., the opening of fractures in the oil and gas reservoir under different pressures can be simulated.

[0161] In the specific implementation process, an existing quasi-3D or full 3D fracturing design tool can be used to input the relevant data of the oil and gas reservoir obtained above into the design tool for simulation. The specific type of the design tool is not specifically limited in the embodiments of the present application.

[0162] For example, a total of 37 natural fractures were picked up in the entire well section, and a pressure of 1.85SG was used to open the fractures. In the case of actual drilling without leakage, no fractures were opened; the pressure was gradually increased, and when the pressure reached 1.93SG, 4 natural fractures were opened, and the fracture opening rate was 11%; the pressure continued to be gradually increased, and when the pressure reached 2.05SG, 25 natural fractures were opened, and the fracture opening rate was 70%.

[0163] It should be noted that the opening of a natural fracture may be an extension of the natural fracture, or a further increase in the width of the natural fracture, or the opening of other fractures on the axial side of the natural fracture, which is not limited here. The pressure unit SG may also be measured in g / cm3.

[0164] Finally, the construction pressure is determined based on the opening results and combined with the parameters of the fracturing equipment and formation.

[0165] In the specific implementation process, the pressure corresponding to the high opening rate tends to be selected. However, the higher the pressure, the higher the requirements for the fracturing equipment, and there is a possibility of damaging the formation and causing danger during fracturing. Therefore, it is also necessary to combine the parameters of the fracturing equipment in the actual fracturing work and the parameters of the formation in the area. In this way, the determined construction pressure can achieve the purpose of successful fracturing and can be carried out safely.

[0166] The parameters of the fracturing equipment may be parameters related to the fracturing string, the pressure bearing capacity of the wellhead device, the friction resistance of the fracturing fluid, etc., and the parameters of the formation may be parameters such as the formation pressure and the fracture extension pressure.

[0167] S309, performing fracture simulation according to the target construction pressure, target perforation section and target reservoir transformation method to obtain at least one of fracture parameters, preset production and safety factor; determining the construction scope according to at least one of fracture parameters, preset production and safety factor.

[0168] In the specific implementation process, the logging data of the oil and gas reservoir, the previously determined reservoir transformation method, perforation section, and construction pressure can be input into the existing quasi-3D or full 3D fracturing design tools to perform fracture simulation. In this way, the estimated fracture parameters (fracture length, fracture height, conductivity, etc.) can be obtained before the actual fracturing. Then, a reasonable construction range can be determined in combination with the preset production and the preset safety factor. For example: if the conductivity of the fracture is estimated to be poor, the construction range will be expanded and fracturing will be performed in multiple locations.

[0169] Here, the preset production can be set according to the production target of oil and gas in different regions. The preset safety factor can be comprehensively evaluated from the aspects of ground stress, rock mechanics, sand production risk index, and reservoir distribution near the well, which is not specifically limited in the embodiments of this application.

[0170] S310, generating a transformation template according to at least one of the logging data, the target reservoir transformation method, the target perforation section, the target construction pressure, and the target construction range.

[0171] Among them, the transformation template is used to guide the transformation of oil and gas reservoirs.

[0172] After obtaining the logging data, the situation of the wells that exploit the oil and gas reservoirs can be determined. After determining the reservoir transformation method, perforation section, construction pressure, and construction range, it will be possible to know where, what method, and how much effort to use to transform the reservoir. In this way, the logging data is saved in correspondence with the determined reservoir transformation method, perforation section, construction pressure, and construction range, and a transformation template is generated. When other wells with similar logging data to the well also need to undergo reservoir transformation, the transformation template can be used to find the corresponding reservoir transformation method, perforation section, construction pressure, and construction range of the well, and then the reservoir transformation of other wells can be performed to improve efficiency. Among them, the difference between the logging data of other wells and the logging data of the target well is within the error range, and this difference can be the difference between one, several, or all of the logging data.

[0173] It should be noted that the embodiment of the present application does not specifically limit the execution order of the above steps.

[0174] As can be seen from the above content, the method provided in the embodiment of the present application obtains the logging data of the oil and gas reservoir of the target well in response to the reservoir transformation method acquisition instruction; determines the minimum horizontal principal stress, brittleness index and fracture toughness value of the oil and gas reservoir of the target well according to the logging data; then, determines the natural fracture surface stress in the oil and gas reservoir of the target well according to the logging data; then, determines the weights of the minimum horizontal principal stress, natural fracture surface stress, brittleness index and fracture toughness value; then, obtains the fracturability index of the oil and gas reservoir of the target well according to the minimum horizontal principal stress, brittleness index, fracture toughness value, natural fracture surface stress, and the weight value of the minimum horizontal 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; determines the target reservoir transformation method corresponding to the fracturability index according to the preset correspondence between the fracturability index and the reservoir transformation method; finally, performs reservoir transformation on the target well according to the transformation method. And, determines the perforation section, construction pressure, and construction range, and generates a transformation template. In this way, the specific value of the fracturing index in the oil and gas reservoir can be calculated through the minimum horizontal principal stress, natural fracture surface stress, brittleness index and fracture toughness and their weights of the oil and gas reservoir. Then, based on the specific data of the fracturing index, the actual situation of the oil and gas reservoir can be accurately determined, and the appropriate reservoir transformation method, perforation section, construction pressure, construction scope can be found, and a transformation template can be generated to transform the oil and gas reservoir and improve the single well production and recovery efficiency.

[0175] Based on the same inventive concept, as an implementation of the above method, an embodiment of the present application also provides an oil and gas reservoir transformation device.

[0176] Figure 6 This is a schematic diagram of the structure of an oil and gas reservoir transformation device provided in one embodiment of the present application. Figure 6 As shown, the apparatus 600 may include:

[0177] An acquisition module 601 is used to acquire well logging data of the oil and gas reservoir of the target well in response to a reservoir transformation mode acquisition instruction;

[0178] Determination module 602, for determining the minimum horizontal principal stress, brittleness index and fracture toughness value of the oil and gas reservoir of the target well according to the well logging data;

[0179] Processing module 603, obtaining a fracturability index of the oil and gas reservoir of the target well according to the minimum horizontal principal stress, the brittleness index, the fracture toughness value, and the weight value of the minimum horizontal principal stress, the weight value of the brittleness index, and the weight value of the fracture toughness value;

[0180] The determination module 602 is further used to determine a target reservoir transformation method corresponding to the fracturability index according to a preset correspondence between the fracturability index and the reservoir transformation method, and the target reservoir transformation method is used to transform the oil and gas reservoir of the target well.

[0181] It can be understood that the oil and gas reservoir transformation device provided in the embodiments of the present application can be used to implement the technical solutions of any of the above-mentioned method embodiments, and its implementation principles and technical effects are similar. For details, please refer to the above-mentioned method embodiments, which will not be repeated here.

[0182] Optionally, the determination module 602 is further used to determine the natural fracture surface stress in the oil and gas reservoir of the target well according to the well logging data;

[0183] The acquisition module 601 is also used to obtain the weight value of the natural fracture surface stress;

[0184] The processing module 603 is also used to obtain the fracturability index of the oil and gas reservoir of the target well based on the minimum horizontal principal stress, the brittleness index, the fracture toughness value, the natural fracture surface stress, and the weight value of the minimum horizontal 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.

[0185] Optionally, the determination module 602 is specifically used to determine the normal stress and shear stress of the natural fracture surface in the oil and gas reservoir of the target well according to the well logging data;

[0186] The natural fracture surface stress in the oil and gas reservoir of the target well is determined 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.

[0187] Optionally, the determination module 602 is specifically used to determine that the target reservoir transformation method is a barite decontamination acid fracturing transformation method when the fracturability index is less than or equal to a first preset value and greater than or equal to a second preset value;

[0188] When the fracturability index is less than the second preset value and greater than or equal to the third preset value, determining that the target reservoir reconstruction method is a sand fracturing reconstruction method smaller than the preset scale;

[0189] When the fracturability index is less than the third preset value and greater than or equal to the fourth preset value, determining that the target reservoir reconstruction method is a sand fracturing reconstruction method greater than a preset scale;

[0190] When the fracturability index is less than a fourth preset value, determining whether to perform sand fracturing on the reservoir near the wellbore according to the development of the reservoir near the wellbore;

[0191] Among them, the first preset value is greater than the second preset value, the second preset value is greater than the third preset value, and the third preset value is greater than the fourth preset value.

[0192] Optionally, the determination module 602 is further used to determine a target perforation section corresponding to the target reservoir transformation method according to the target reservoir transformation method;

[0193] Among them, when the target reservoir transformation method is barite decontamination acid fracturing transformation, the target perforation section is determined to be the fracture development zone;

[0194] When the target reservoir transformation method is the sand fracturing transformation method, the target perforation section is determined to be the periphery of the fracture development zone.

[0195] Optionally, the processing module 603 is further used to perform a fracture opening simulation according to the well logging data, the target reservoir transformation method 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;

[0196] The determination module 602 is further configured to determine a target construction pressure according to at least one crack opening result.

[0197] Optionally, the processing module 603 is further used to perform fracture simulation according to the target construction pressure, the target perforation section and the target reservoir reconstruction method to obtain at least one of fracture parameters, preset production and safety factor;

[0198] The determination module 602 is also used to determine the construction scope according to at least one of the crack parameters, the preset production and the safety factor.

[0199] Optionally, the processing module 603 is further used to generate a transformation template according to at least one of the logging data, the target reservoir transformation method, the target perforation section, the target construction pressure, and the target construction range, and the transformation template is used to guide the oil and gas reservoir transformation.

[0200] It can be understood that the oil and gas reservoir transformation device provided in the embodiments of the present application can be used to implement the technical solutions of any of the above-mentioned method embodiments, and its implementation principles and technical effects are similar. For details, please refer to the above-mentioned method embodiments, which will not be repeated here.

[0201] Based on the same inventive concept, an embodiment of the present application also provides an electronic device.

[0202] Figure 7 A schematic diagram of the structure of an electronic device provided in one embodiment of the present application. Figure 7 As shown, the electronic device 700 of the embodiment of the present application can be used to implement the method described in the above method embodiment. Please refer to the description in the above method embodiment for details.

[0203] The electronic device 700 includes a processing component 701, which further includes one or more processors, and a memory resource represented by a memory 702 for storing instructions executable by the processing component 701, such as an application. The application stored in the memory 702 may include one or more modules each corresponding to a set of instructions. In addition, the processing component 701 is configured to execute instructions to perform such as Figure 2 , Figure 3 For the method embodiment shown, please refer to the description in the above method embodiment for details, which will not be repeated here.

[0204] 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 X™, Unix™, Linux™, FreeBSD™ or the like.

[0205] It can be understood by those skilled in the art that Figure 7 The structure of the electronic device shown in the figure does not constitute a limitation on the electronic device, and may include more or less components than shown in the figure, or combine certain components, or arrange the components differently.

[0206] It should be noted that the electronic device provided is used to implement the method described in the method embodiment and can achieve the same technical effect. The parts and beneficial effects that are the same as those in the method embodiment will not be described in detail here. Based on the same inventive concept, the embodiment of the present application also provides a computer-readable storage medium, the computer-readable storage medium includes a stored program, wherein when the program is running, the device where the storage medium is located is controlled to execute the method in one or more of the above embodiments.

[0207] It should be noted here that the description of the above computer-readable storage medium embodiment is similar to the description of the above method embodiment, and has similar beneficial effects as the method embodiment. For technical details not disclosed in the embodiment of the computer-readable storage medium of the embodiment of the present application, please refer to the description of the method embodiment of the present application for understanding.

[0208] Based on the same inventive concept, an embodiment of the present application also provides a computer program product, including a computer program. When the computer program is executed by a processor, the oil and gas reservoir transformation method in the above method embodiment is implemented.

[0209] In the several embodiments provided, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0210] In addition, each functional unit in each embodiment may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of hardware plus software functional units.

[0211] The above-mentioned integrated unit implemented in the form of a software functional unit can be stored in a computer-readable storage medium. The above-mentioned software functional unit is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) or a processor (English: processor) to perform some steps of each embodiment method. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (English: Read-Only Memory, abbreviated: ROM), random access memory (English: Random Access Memory, abbreviated: RAM), disk or optical disk and other media that can store program codes.

[0212] In the above embodiments, it should be understood that the processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), etc. The steps of the disclosed method may be directly implemented as being executed by a hardware processor, or may be implemented as being executed by a combination of hardware and software modules in the processor.

[0213] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0214] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

Claims

1. A method for transforming an oil and gas reservoir, characterized in that: The method comprises: In response to the reservoir transformation mode acquisition instruction, well logging data of the oil and gas reservoir of the target well is acquired; Determining the minimum horizontal principal stress, brittleness index and fracture toughness value of the oil and gas reservoir of the target well according to the well logging data; Determining the normal stress and shear stress of the natural fracture surface in the oil and gas reservoir of the target well according to the well logging data; 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; Obtaining the fracturability index of the oil and gas reservoir of the target well according to the minimum horizontal principal stress, the brittleness index, the fracture toughness value, the natural fracture surface stress, and the weight value of the minimum horizontal 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; When the fracturability index is less than or equal to the first preset value and greater than or equal to the second preset value, determining that the target reservoir transformation method is a barite decontamination acid fracturing transformation method; When the fracturability index is less than the second preset value and greater than or equal to the third preset value, determining that the target reservoir reconstruction method is a sand fracturing reconstruction method smaller than a preset scale; When the fracturability index is less than a third preset value and greater than or equal to a fourth preset value, determining that the target reservoir reconstruction method is a sand fracturing reconstruction method greater than a preset scale; When the fracturability index is less than a fourth preset value, determining whether to perform sand fracturing on the reservoir near the wellbore according to the development of the reservoir near the wellbore; Among them, the first preset value is greater than the second preset value, the second preset value is greater than the third preset value, and the third preset value is greater than the fourth preset value.

2. The method according to claim 1, characterized in that After determining the target reservoir transformation method according to the correspondence between the fracturability index and the reservoir transformation method, the method further includes: According to the target reservoir transformation method, determining a target perforation section corresponding to the target reservoir transformation method; Wherein, when the target reservoir reconstruction method is the barite decontamination acid fracturing reconstruction method, the target perforation section is determined to be a fracture development zone; When the target reservoir reconstruction method is the sand fracturing reconstruction method, the target perforation section is determined to be the periphery of the fracture development zone.

3. The method according to claim 2, characterized in that After determining the target perforation section corresponding to the target reservoir transformation method according to the target reservoir transformation method, the method further includes: Perform fracture opening simulation according to the well logging data, the target reservoir transformation method 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; A target construction pressure is determined according to the at least one crack opening result.

4. The method according to claim 3, characterized in that After determining the target construction pressure according to the at least one crack opening result, the method further comprises: Perform fracture simulation according to the target operation pressure, the target perforation section and the target reservoir reconstruction method to obtain at least one of fracture parameters, preset production and safety factor; The construction scope is determined according to at least one of the crack parameters, the preset yield and the safety factor.

5. The method according to claim 4, characterized in that After determining the construction scope according to at least one of the crack parameters, the preset yield and the safety factor, the method further includes: A transformation template is generated according to at least one of the logging data, the target reservoir transformation method, the target perforation section, the target construction pressure, and the target construction range, and the transformation template is used to guide oil and gas reservoir transformation.

6. An oil and gas reservoir transformation device, characterized in that: The device comprises: An acquisition module, for acquiring well logging data of an oil and gas reservoir of a target well in response to a reservoir transformation mode acquisition instruction; A determination module, used to determine the minimum horizontal principal stress, brittleness index and fracture toughness value of the oil and gas reservoir of the target well according to the well logging data; The determination module is used to determine the normal stress and shear stress of the natural fracture surface in the oil and gas reservoir of the target well according to the well logging data; 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; A processing module, for obtaining a fracturability index of the oil and gas reservoir of the target well according to the minimum horizontal principal stress, the brittleness index, the fracture toughness value, the natural fracture surface stress, and a weight value of the minimum horizontal principal stress, a weight value of the brittleness index, a weight value of the fracture toughness value, and a weight value of the natural fracture surface stress; The determination module is further configured to determine that the target reservoir transformation method is a barite decontamination acid fracturing transformation method when the fracturability index is less than or equal to a first preset value and greater than or equal to a second preset value; When the fracturability index is less than the second preset value and greater than or equal to the third preset value, determining that the target reservoir reconstruction method is a sand fracturing reconstruction method smaller than a preset scale; When the fracturability index is less than a third preset value and greater than or equal to a fourth preset value, determining that the target reservoir reconstruction method is a sand fracturing reconstruction method greater than a preset scale; When the fracturability index is less than a fourth preset value, determining whether to perform sand fracturing on the reservoir near the wellbore according to the development of the reservoir near the wellbore; Among them, the first preset value is greater than the second preset value, the second preset value is greater than the third preset value, and the third preset value is greater than the fourth preset value.

7. An electronic device, characterized in that: include: Memory and processor; The memory is used to store program instructions; The processor is used to call the program instructions in the memory to execute the method according to any one of claims 1-5.

8. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program; when the computer program is executed, the oil and gas reservoir transformation method according to any one of claims 1 to 5 is implemented.

9. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the oil and gas reservoir transformation method described in any one of claims 1 to 5 is implemented.

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