CN111985669B - Method, device and equipment for selecting modification mode of fractured reservoir - Google Patents
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Abstract
The invention provides a method, a device and equipment for selecting a modification mode of a fractured reservoir, wherein the method comprises the following steps: determining a first minimum pressurization pressure required when each fracture is activated among the M fractures in the reservoir; determining a second minimum pressurizing pressure required when N cracks are activated according to the first minimum pressurizing pressure corresponding to each crack; determining an activation net pressure value of the crack corresponding to the second minimum pressurizing pressure according to the second minimum pressurizing pressure and the horizontal minimum main stress of the crack corresponding to the second minimum pressurizing pressure; selecting a reservoir reformation mode according to the activated net pressure value; the modification mode comprises acidification modification, acid fracturing modification or sand fracturing modification. The method, the device and the equipment for selecting the modification mode of the fractured reservoir improve the success rate and the accuracy of reservoir modification.
Description
Technical Field
The invention relates to petroleum exploitation technology, in particular to a method, a device and equipment for selecting a modification mode of a fractured reservoir.
Background
In the petroleum exploitation process, the petroleum reservoir is required to be modified to improve the petroleum yield, and the modification mode is required to be selected according to the specific condition of the reservoir when the reservoir is modified.
In the prior art, when a low-yield fractured tight sandstone reservoir is reformed, the reforming mode is generally determined according to the number of fracture development in the reservoir. If the number of the natural cracks is large, adopting a low-strength acidification transformation mode; when the number of the natural cracks is centered, an acid fracturing modification mode is adopted; and when the number of cracks is small, a fracturing transformation mode is adopted.
However, since some natural cracks are not effective, the improvement method determined according to the number of the cracks cannot ensure that the cracks in the reservoir are activated, so that the success rate of reservoir improvement is low, and the aim of improving the yield cannot be achieved.
Disclosure of Invention
The invention provides a method, a device and equipment for selecting a modification mode of a fractured reservoir, which are used for improving the success rate of petroleum reservoir modification.
The invention provides a method for selecting a modification mode of a fractured reservoir, which comprises the following steps:
Determining a first minimum pressurization pressure required when each fracture is activated among the M fractures in the reservoir;
determining a second minimum pressurizing pressure required when N cracks are activated according to the first minimum pressurizing pressure corresponding to each crack; the second minimum pressurizing pressure is one of the M first minimum pressurizing pressures, M and N are positive integers, and N is smaller than or equal to M;
determining an activation net pressure value of the crack corresponding to the second minimum pressurizing pressure according to the second minimum pressurizing pressure and the horizontal minimum main stress of the crack corresponding to the second minimum pressurizing pressure;
selecting a reservoir reformation mode according to the activated net pressure value; the modification mode comprises acidification modification, acid fracturing modification or sand fracturing modification.
Further, the retrofitting of the selected reservoir based on the activated net pressure value comprises:
If the activation net pressure value is smaller than a first threshold value, selecting acidification modification;
if the activation net pressure value is greater than or equal to the first threshold value and less than or equal to the second threshold value, acid pressure modification is selected;
if the activation net pressure value is greater than the second threshold value, selecting a sand fracturing modification mode;
Wherein the first threshold is less than the second threshold.
Optionally, the determining a first minimum pressurization pressure required when each fracture is activated in M fractures in the reservoir comprises:
Determining the overburden stress, the horizontal maximum principal stress and the horizontal minimum principal stress of each crack in M cracks in a reservoir;
Determining the shear stress and the normal stress of the cracks according to the overlying stress, the horizontal maximum main stress, the horizontal minimum main stress, the inclination angle of each crack and the included angle between the trend of each crack and the horizontal maximum main stress;
The first minimum pressurization pressure required when the fracture is activated is determined based on the shear stress and the positive stress.
Optionally, the determining the second minimum pressurizing pressure required when the N cracks are activated according to the first minimum pressurizing pressure corresponding to each crack includes:
Sequencing the first minimum pressurizing pressures corresponding to each crack in the M cracks, and determining N smaller first minimum pressurizing pressures;
the maximum value of the smaller N first minimum pressurization pressures is determined as a second minimum pressurization pressure required when the N cracks are activated.
Optionally, the determining the overburden stress, the horizontal maximum principal stress, and the horizontal minimum principal stress for each of the M fractures in the reservoir includes:
the overburden stress for each fracture was determined according to the following formula:
Wherein σ v is the overburden stress of the crack; g is gravity acceleration; tvd is the vertical depth of the earth's surface to the formation; ρ b is the density curve of the reservoir;
The horizontal maximum principal stress for each crack was determined according to the following formula:
the horizontal minimum principal stress for each crack was determined according to the following formula:
Wherein σ H is the horizontal maximum principal stress of the crack; σ h is the horizontal maximum principal stress of the crack; v is poisson's ratio; σ v is the overburden stress of the crack; beta is an effective stress coefficient, and the value range is 0-1; p p is pore pressure; e is Young's modulus; epsilon h is the strain induced in the direction of the minimum horizontal stress of the crack and epsilon H is the strain induced in the direction of the maximum horizontal stress of the crack.
Further, the determining the shear stress and the normal stress of the crack according to the overlying stress, the horizontal maximum principal stress, the horizontal minimum principal stress, the inclination angle of each crack and the included angle between the trend of the crack and the horizontal maximum principal stress includes:
the positive stress experienced by each crack was determined according to the following formula:
σn＝l2·σH+m2·σh+n2·σv
The shear stress to which each crack is subjected is determined according to the following formula:
τn＝(l2·σH 2+m2·σh 2+n2·σv 2-σh 2)1/2
Where l=sinθ×sinα; m=cos θ×cos α; n=cos α;
σ n is the normal stress to which the crack is subjected; τ n is the shear stress to which the crack is subjected; alpha is the inclination angle of the crack; θ is the angle between the direction of the crack and the direction of the horizontal maximum principal stress of the crack.
Further, the determining a first minimum pressurization pressure required for the fracture to be activated based on the shear stress and the positive stress includes:
The first minimum pressurization pressure required when each fracture is activated is determined according to the following formula:
Wherein P in is the first minimum pressurization pressure required when each fracture is activated; mu is the friction coefficient of the joint surface of the crack.
The invention provides a device for selecting a reconstruction mode of a fractured reservoir, which comprises the following steps:
A first determining module for determining a first minimum pressurization pressure required when each fracture is activated among M fractures in the reservoir;
The second determining module is used for determining a second minimum pressurizing pressure required when the N cracks are activated according to the first minimum pressurizing pressure corresponding to each crack; the second minimum pressurizing pressure is one of the M first minimum pressurizing pressures, M and N are positive integers, and N is smaller than or equal to M;
the third determining module is used for determining an activation net pressure value of the crack corresponding to the second minimum pressurizing pressure according to the second minimum pressurizing pressure and the horizontal minimum main stress of the crack corresponding to the second minimum pressurizing pressure;
the selection module is used for selecting a modification mode of the reservoir according to the activated net pressure value; the modification mode comprises acidification modification, acid fracturing modification or sand fracturing modification.
Further, the selection module is specifically configured to:
If the activation net pressure value is smaller than a first threshold value, selecting acidification modification;
if the activation net pressure value is greater than or equal to the first threshold value and less than or equal to the second threshold value, acid pressure modification is selected;
if the activation net pressure value is greater than the second threshold value, selecting a sand fracturing modification mode;
Wherein the first threshold is less than the second threshold.
Optionally, the first determining module is specifically configured to:
Determining the overburden stress, the horizontal maximum principal stress and the horizontal minimum principal stress of each crack in M cracks in a reservoir;
Determining the shear stress and the normal stress of the cracks according to the overlying stress, the horizontal maximum main stress, the horizontal minimum main stress, the inclination angle of each crack and the included angle between the trend of each crack and the horizontal maximum main stress;
The first minimum pressurization pressure required when the fracture is activated is determined based on the shear stress and the positive stress.
Optionally, the second determining module is specifically configured to:
Sequencing the first minimum pressurizing pressures corresponding to each crack in the M cracks, and determining N smaller first minimum pressurizing pressures;
the maximum value of the smaller N first minimum pressurization pressures is determined as a second minimum pressurization pressure required when the N cracks are activated.
Optionally, the first determining module is specifically configured to:
the overburden stress for each fracture was determined according to the following formula:
Wherein σ v is the overburden stress of the crack; g is gravity acceleration; tvd is the vertical depth of the earth's surface to the formation; ρ b is the density curve of the reservoir;
The horizontal maximum principal stress for each crack was determined according to the following formula:
the horizontal minimum principal stress for each crack was determined according to the following formula:
Wherein σ H is the horizontal maximum principal stress of the crack; σ h is the horizontal maximum principal stress of the crack; v is poisson's ratio; σ v is the overburden stress of the crack; beta is an effective stress coefficient, and the value range is 0-1; p p is pore pressure; e is Young's modulus; epsilon h is the strain induced in the direction of the minimum horizontal stress of the crack and epsilon H is the strain induced in the direction of the maximum horizontal stress of the crack.
Further, the first determining module is specifically further configured to:
the positive stress experienced by each crack was determined according to the following formula:
σn＝l2σH+m2σh+n2σv
The shear stress to which each crack is subjected is determined according to the following formula:
τn＝(l2σH 2+m2σh 2+n2σv 2-σh 2)1/2
Where l=sinθ×sinα; m=cos θ×cos α; n=cos α;
σ n is the normal stress to which the crack is subjected; τ n is the shear stress to which the crack is subjected; alpha is the inclination angle of the crack; and 0 is the included angle between the trend of the crack and the direction of the horizontal maximum principal stress of the crack.
Further, the first determining module is specifically further configured to:
The first minimum pressurization pressure required when each fracture is activated is determined according to the following formula:
Wherein P in is the first minimum pressurization pressure required when each fracture is activated; mu is the friction coefficient of the joint surface of the crack.
The invention provides a reconstruction mode selection device of a fractured reservoir, which comprises the following components: a memory and a processor; the memory is connected with the processor;
The memory is used for storing a computer program;
the processor is configured to implement a method of selecting a method of modifying a fractured reservoir as defined in any one of the above, when the computer program is executed.
The present invention provides a storage medium having stored thereon a computer program which, when executed by a processor, implements a method of selecting a method of modifying a fractured reservoir as defined in any one of the above.
The invention provides a method, a device and equipment for selecting a modification mode of a fractured reservoir, which are used for determining a first minimum pressurizing pressure required when each fracture is activated in M fractures in the reservoir; determining a second minimum pressurizing pressure required when N cracks are activated according to the first minimum pressurizing pressure corresponding to each crack; then determining an activation net pressure value of the crack corresponding to the second minimum pressurizing pressure according to the second minimum pressurizing pressure and the horizontal minimum main stress of the crack corresponding to the second minimum pressurizing pressure; and further selecting a reservoir retrofitting mode based on the activated net pressure value. Based on the mechanical mechanism characteristics of reservoir reconstruction, the method determines the activation net pressure value of the crack corresponding to the minimum required pressurizing pressure according to the number of the cracks required to be activated, further determines the reconstruction mode of the reservoir, and improves the success rate and accuracy of reservoir reconstruction.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to the drawings without inventive effort to a person skilled in the art.
FIG. 1 is a schematic flow chart of a method for selecting a modification mode of a fractured reservoir according to the present invention;
FIG. 2 is a second flow chart of a method for selecting a modification mode of a fractured reservoir according to the present invention;
FIG. 3 is a schematic diagram of the results of a device for selecting a fracture reservoir modification mode provided by the present invention;
Fig. 4 is a schematic diagram of the results of a device for selecting a modification mode of a fractured reservoir according to the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Fig. 1 is a schematic flow chart of a method for selecting a modification mode of a fractured reservoir according to the present invention. The execution main body of the method is a device for selecting the reconstruction mode of the fractured reservoir, and the device can be realized in a software and/or hardware mode. As shown in fig. 1, the method of the present embodiment may include:
s101, determining a first minimum pressurizing pressure required when each crack is activated in M cracks in a reservoir.
The natural fracture is in a mechanically stable state prior to reservoir intervention, i.e., without injection of pressure into the wellbore. In the reservoir reconstruction process, the stress state of the fracture can be changed along with the continuous increase of injection pressure; specifically, the pressure is increased to enable the three-dimensional pressure of the natural fracture near the well bore to be increased, the stress condition of the fracture surface is changed, and when the pressure is large enough, the fracture surface shear stress is larger than the friction force of the fracture surface, so that the fracture is activated, namely, the fracture is sheared and activated.
Therefore, in this embodiment, a mechanical model of the fracture may be established by acquiring geological parameters of the fracture and stress data of the fracture, and a first minimum pressurizing pressure activated for each fracture of the M fractures may be determined; for each crack, under the condition of receiving the corresponding first minimum pressurizing pressure, the shear stress received by the crack is equal to the friction force of the joint surface generated by the normal stress, the pressurizing pressure is further increased on the basis of the first minimum pressurizing pressure, and the crack is in an activated state. In the process of carrying out fracture modification, the corresponding fracture can be activated as long as the bottom hole injection pressure is greater than the first minimum pressurization pressure.
S102, determining a second minimum pressurizing pressure required when N cracks are activated according to the first minimum pressurizing pressure corresponding to each crack.
The second minimum pressurizing pressure is one of the M first minimum pressurizing pressures, M and N are positive integers, and N is smaller than or equal to M.
In order to achieve the aim of reservoir reconstruction, so that the oil well can achieve the corresponding oil production aim, the number N of activated cracks in the reservoir is required to meet certain requirements, and the specific number N is determined according to actual requirements. In practical applications, the number N of activated cracks in the reservoir may be a preset proportion of the number M of cracks in the reservoir, for example, the preset proportion may be set to 80% of the number M of cracks; or N may be set directly to a preset value less than or equal to M.
After the first minimum pressurization pressure when each crack is activated is obtained and the value of N is determined, one first minimum pressurization pressure can be determined from M first minimum pressurization pressures as a second minimum pressurization pressure required to enable the activation of N cracks. The second minimum pressurization pressure may be used as a downhole injection pressure during reservoir retrofitting.
S103, determining an activation net pressure value of the crack corresponding to the second minimum pressurizing pressure according to the second minimum pressurizing pressure and the horizontal minimum main stress of the crack corresponding to the second minimum pressurizing pressure.
S104, selecting a modification mode of the reservoir according to the activated net pressure value.
Wherein, the transformation mode comprises acidification transformation, acid fracturing transformation or sand fracturing transformation.
After the second minimum pressurizing pressure is determined as described above, a crack corresponding to the second minimum pressurizing pressure, which is the last activated crack of the N cracks that the second minimum pressurizing pressure can activate, may be further determined. And subtracting the horizontal minimum principal stress of the crack corresponding to the second minimum pressurizing pressure from the second minimum pressurizing pressure to obtain an activation net pressure value of the crack corresponding to the second minimum pressurizing pressure. Then, the transformation mode can be selected according to the activated net pressure value, and different activated static pressure values correspond to different transformation modes. In practical application, corresponding tests can be carried out according to the characteristics of the reservoir, and the corresponding relation between the activation static pressure value and the transformation mode can be determined.
The method for selecting the modification mode of the fractured reservoir provided by the embodiment comprises the following steps: determining a first minimum pressurization pressure required when each fracture is activated among the M fractures in the reservoir; determining a second minimum pressurizing pressure required when N cracks are activated according to the first minimum pressurizing pressure corresponding to each crack; then determining an activation net pressure value of the crack corresponding to the second minimum pressurizing pressure according to the second minimum pressurizing pressure and the horizontal minimum main stress of the crack corresponding to the second minimum pressurizing pressure; and further selecting a reservoir retrofitting mode based on the activated net pressure value. According to the method, based on the mechanical mechanism characteristics of reservoir reconstruction, the activation net pressure value of the crack corresponding to the minimum required pressurizing pressure is determined according to the number of cracks required to be activated, so that the reconstruction mode of the reservoir is determined, and the success rate and accuracy of reservoir reconstruction are improved.
Based on the embodiment shown in fig. 1, the modification of the reservoir according to the activated net pressure value in S104 may include: if the activation net pressure value is smaller than a first threshold value, selecting acidification modification; if the activation net pressure value is greater than or equal to the first threshold value and less than or equal to the second threshold value, acid pressure modification is selected; if the activation net pressure value is greater than the second threshold value, selecting a sand fracturing modification mode; wherein the first threshold is less than the second threshold.
For example, if the first threshold is-15 Mpa and the first threshold is 5Mpa, under the condition that the activation net pressure value is less than-15 Mpa, adopting an acidification transformation mode; under the condition that the activation net pressure value is more than or equal to-15 Mpa and less than or equal to 5Mpa, adopting an acid pressure transformation mode; and under the condition that the activation net pressure value is greater than 5Mpa, adopting a sand fracturing modification mode. In practical applications, the first threshold and the second threshold may be determined by performing corresponding tests based on the characteristics of the reservoir.
The invention also provides a method for selecting the modification mode of the fractured reservoir based on the embodiment shown in fig. 1. Fig. 2 is a schematic flow chart II of a method for selecting a modification mode of a fractured reservoir according to the present invention. As shown in fig. 2, based on the embodiment shown in fig. 1, determining in S101 a first minimum pressurization pressure required when each of M fractures in the reservoir is activated includes:
S201, determining the overlying stress, the horizontal maximum principal stress and the horizontal minimum principal stress of each crack in M cracks in the reservoir.
Logging data obtained during oil recovery includes a reservoir density curve ρ b, a longitudinal wave moveout curve Δt comp, and a transverse wave moveout curve Δt shear. Intermediate rock mechanical parameters including shear modulus G, bulk modulus K, young's modulus E, and poisson's ratio v can be calculated from the log data, where:
After the above-mentioned intermediate rock mechanical parameters are determined, the overburden stress of each fracture can be determined according to the following formula:
Wherein σ v is the overburden stress of the crack; g is gravity acceleration; tvd is the vertical depth of the earth's surface to the formation; ρ b is the density curve of the reservoir.
The horizontal maximum principal stress for each crack was determined according to the following formula:
the horizontal minimum principal stress for each crack was determined according to the following formula:
Wherein σ H is the horizontal maximum principal stress of the crack; σ h is the horizontal maximum principal stress of the crack; v is poisson's ratio; σ v is the overburden stress of the crack; beta is an effective stress coefficient, and the value range is 0-1; p p is pore pressure; e is Young's modulus; epsilon h is the strain induced in the direction of the minimum horizontal stress of the crack and epsilon H is the strain induced in the direction of the maximum horizontal stress of the crack.
S202, determining the shear stress and the normal stress of the cracks according to the overlying stress, the horizontal maximum main stress, the horizontal minimum main stress, the inclination angle of each crack and the included angle between the trend of each crack and the horizontal maximum main stress.
The direction of the horizontal maximum principal stress can be obtained according to induced crack trend, borehole collapse and oval borehole azimuth picked up by the electric imaging logging data.
The positive stress experienced by each crack was determined according to the following formula:
σn＝l2σH+m2σh+n2σv
The shear stress to which each crack is subjected is determined according to the following formula:
τn＝(l2σH 2+m2σh 2+n2σv 2-σh 2)1/2
Where l=sinθ×sinα; m=cos θ×cos α; n=cos α;
σ n is the normal stress to which the crack is subjected; τ n is the shear stress to which the crack is subjected; alpha is the inclination angle of the crack; and 0 is the included angle between the trend of the crack and the direction of the horizontal maximum principal stress of the crack.
S203, determining the first minimum pressurizing pressure required when the crack is activated according to the shear stress and the positive stress.
The first minimum pressurization pressure required when each fracture is activated is determined according to the following formula:
Wherein P in is the first minimum pressurization pressure required when each fracture is activated; mu is the friction coefficient of the joint surface of the crack.
According to the method for selecting the modification mode of the fractured reservoir, provided by the embodiment, based on the mechanical mechanism characteristics of reservoir modification, the first minimum pressurization pressure when the fracture is activated is calculated by using the mathematical model, so that the reservoir modification mode further selected based on the first minimum pressurization pressure is more accurate.
Based on the embodiment shown in fig. 1 or fig. 2, determining, in S102, a second minimum pressurization pressure required when N cracks are activated according to the first minimum pressurization pressure corresponding to each crack includes:
sequencing the first minimum pressurizing pressures corresponding to each crack in the M cracks, and determining N smaller first minimum pressurizing pressures; the maximum value of the smaller N first minimum pressurization pressures is determined as a second minimum pressurization pressure required when the N cracks are activated.
The second minimum pressurizing pressure determined by the method can ensure that the number of cracks which can be activated under reasonable cost meets the actual requirement, and the improvement of oil yield is realized while the transformation cost is reduced.
The method for selecting the fracture reservoir modification mode provided by the embodiment of the application can be applied to fracture tight sandstone reservoir modification and reservoir modification similar to fracture tight sandstone reservoir.
In practical application, the bottom hole injection pressure is influenced by the transformation process, the pipe column preparation, the wellhead equipment and the liquid type, and the bottom hole pressure can be increased by optimizing the pipe column and increasing the length of the large-diameter pipe column when the net pressure is activated for shearing a crack of a specific oil well at a certain time.
For example, in a certain oil well reconstruction, in order to improve the net pressure at the bottom of the well, the structure of the pipe column can be adjusted, the number of all the slope oil pipes with the diameter of 88.9 mm and 9.52mm adopted at the upper part is reduced, the slope oil pipes with the diameter of 143 mm and 12.7 mm are replaced and increased by 2500m, the space of the pipe column is enlarged, and the friction resistance of the pipe column is reduced. Through friction consensus calculation, the optimized friction of the pipe column is reduced by about 18.5MPa under the displacement of 5 cubic meters per minute, so that the net pressure at the bottom of the well can be further improved, and the number of crack reconstruction of a reservoir at the bottom of the well is increased.
In some oil wells, under the condition that the fracture shear activation net pressure is constant, the bottom hole injection pressure can be increased by the methods of improving the liquid and increasing the liquid column pressure. For example, in a well, given the high net pressure of natural fracture initiation, the modified fluid density may be raised from 1.0 g/cc to 1.13 g/cc, increasing the hydrostatic column pressure by about 8.5Mpa, and raising the bottom hole injection pressure by 8.5Mpa, thereby increasing the number of fracture modifications in the bottom hole reservoir.
Fig. 3 is a schematic structural diagram of a device for selecting a modification mode of a fractured reservoir according to the present invention. As shown in fig. 3, the modification mode selection device 30 for a fractured reservoir includes:
A first determining module 301, configured to determine a first minimum pressurization pressure required when each of M fractures in the reservoir is activated;
A second determining module 302, configured to determine a second minimum pressurization pressure required when the N cracks are activated according to the first minimum pressurization pressure corresponding to each crack; the second minimum pressurizing pressure is one of the M first minimum pressurizing pressures, M and N are positive integers, and N is smaller than or equal to M;
A third determining module 302, configured to determine a net pressure value of crack activation corresponding to the second minimum pressurization pressure according to the second minimum pressurization pressure and a horizontal minimum principal stress of the crack corresponding to the second minimum pressurization pressure;
a selection module 304 for selecting a reservoir reformation mode based on the activated net pressure value; the modification mode comprises acidification modification, acid fracturing modification or sand fracturing modification.
Further, the selection module 304 is specifically configured to:
If the activation net pressure value is smaller than a first threshold value, selecting acidification modification;
if the activation net pressure value is greater than or equal to the first threshold value and less than or equal to the second threshold value, acid pressure modification is selected;
if the activation net pressure value is greater than the second threshold value, selecting a sand fracturing modification mode;
Wherein the first threshold is less than the second threshold.
Optionally, the first determining module 301 is specifically configured to:
Determining the overburden stress, the horizontal maximum principal stress and the horizontal minimum principal stress of each crack in M cracks in a reservoir;
Determining the shear stress and the normal stress of the cracks according to the overlying stress, the horizontal maximum main stress, the horizontal minimum main stress, the inclination angle of each crack and the included angle between the trend of each crack and the horizontal maximum main stress;
The first minimum pressurization pressure required when the fracture is activated is determined based on the shear stress and the positive stress.
Optionally, the second determining module 302 is specifically configured to:
Sequencing the first minimum pressurizing pressures corresponding to each crack in the M cracks, and determining N smaller first minimum pressurizing pressures;
the maximum value of the smaller N first minimum pressurization pressures is determined as a second minimum pressurization pressure required when the N cracks are activated.
Optionally, the first determining module 301 is specifically configured to:
the overburden stress for each fracture was determined according to the following formula:
Wherein σ v is the overburden stress of the crack; g is gravity acceleration; tvd is the vertical depth of the earth's surface to the formation; ρ b is the density curve of the reservoir;
The horizontal maximum principal stress for each crack was determined according to the following formula:
the horizontal minimum principal stress for each crack was determined according to the following formula:
Wherein σ H is the horizontal maximum principal stress of the crack; σ h is the horizontal maximum principal stress of the crack; v is poisson's ratio; σ v is the overburden stress of the crack; beta is an effective stress coefficient, and the value range is 0-1; p p is pore pressure; e is Young's modulus; epsilon h is the strain induced in the direction of the minimum horizontal stress of the crack and epsilon H is the strain induced in the direction of the maximum horizontal stress of the crack.
Further, the first determining module 301 is further specifically configured to:
the positive stress experienced by each crack was determined according to the following formula:
σn＝l2σH+m2σh+n2σv
The shear stress to which each crack is subjected is determined according to the following formula:
τn＝(l2σH 2+m2σh 2+n2σv 2-σh 2)1/2
Where l=sinθ×sinα; m=cos θ×cos α; n=cos α;
σ n is the normal stress to which the crack is subjected; τ n is the shear stress to which the crack is subjected; alpha is the inclination angle of the crack; θ is the angle between the direction of the crack and the direction of the horizontal maximum principal stress of the crack.
Further, the first determining module 301 is further specifically configured to:
The first minimum pressurization pressure required when each fracture is activated is determined according to the following formula:
Wherein P in is the first minimum pressurization pressure required when each fracture is activated; mu is the friction coefficient of the joint surface of the crack.
The device for selecting the modification mode of the fractured reservoir provided in this embodiment may be used to execute the technical scheme of the method embodiment shown in fig. 1 or fig. 2, and its implementation principle and technical effect are similar, and will not be described here again.
Fig. 4 is a schematic structural diagram of a modification mode selection device for a fractured reservoir according to the present invention. As shown in fig. 4, the modification mode selection apparatus 40 of the fractured reservoir includes: a memory 401 and a processor 402; the memory 401 is connected to the processor 402.
A memory 401 for storing a computer program;
a processor 402 for implementing a method of fracture reservoir retrofit mode selection as shown in fig. 1 or fig. 2 when the computer program is executed.
The present invention provides a storage medium having stored thereon a computer program which, when executed by a processor, implements a method of selecting a method of modifying a fractured reservoir as shown in fig. 1 or fig. 2.
Those of ordinary skill in the art will appreciate that: all or part of the steps for implementing the method embodiments described above may be performed by hardware associated with program instructions. The foregoing program may be stored in a computer readable storage medium. The program, when executed, performs steps including the method embodiments described above; and the aforementioned storage medium includes: various media that can store program code, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (7)
1. A method of selecting a method of modifying a fractured reservoir, comprising:
Determining a first minimum pressurization pressure required when each fracture is activated among the M fractures in the reservoir;
Determining a second minimum pressurizing pressure required when N cracks are activated according to the first minimum pressurizing pressure corresponding to each crack; the second minimum pressurizing pressure is one of M first minimum pressurizing pressures, M and N are positive integers, and N is smaller than or equal to M;
Determining an activation net pressure value of the crack corresponding to the second minimum pressurizing pressure according to the second minimum pressurizing pressure and the horizontal minimum main stress of the crack corresponding to the second minimum pressurizing pressure;
selecting a reservoir reformation mode according to the activated net pressure value; the modification mode comprises acidification modification, acid fracturing modification or sand fracturing modification;
the determining a first minimum pressurization pressure required when each fracture is activated among M fractures in the reservoir comprises:
Determining the overburden stress, the horizontal maximum principal stress and the horizontal minimum principal stress of each crack in M cracks in a reservoir;
determining the shear stress and the normal stress of the cracks according to the overlying stress, the horizontal maximum main stress, the horizontal minimum main stress, the inclination angle of each crack and the included angle between the trend of each crack and the horizontal maximum main stress;
determining the first minimum pressurization pressure required when the fracture is activated based on the shear stress and the normal stress;
The determining the second minimum pressurizing pressure required when the N cracks are activated according to the first minimum pressurizing pressure corresponding to each crack comprises:
Sequencing the first minimum pressurizing pressures corresponding to each crack in the M cracks, and determining N smaller first minimum pressurizing pressures;
determining the maximum value of the smaller N first minimum pressurizing pressures as a second minimum pressurizing pressure required when N cracks are activated;
The determining of the overburden stress, the horizontal maximum principal stress and the horizontal minimum principal stress for each of the M fractures in the reservoir comprises:
the overburden stress for each fracture was determined according to the following formula:
Wherein σ v is the overburden stress of the crack; g is gravity acceleration; tvd is the vertical depth of the earth's surface to the formation; ρ b is the density curve of the reservoir;
The horizontal maximum principal stress for each crack was determined according to the following formula:
the horizontal minimum principal stress for each crack was determined according to the following formula:
Wherein σ H is the horizontal maximum principal stress of the crack; σ h is the horizontal minimum principal stress of the crack; v is poisson's ratio; σ v is the overburden stress of the crack; beta is an effective stress coefficient, and the value range is 0-1; p p is pore pressure; e is Young's modulus; epsilon h is the strain induced in the direction of the minimum horizontal stress of the crack and epsilon H is the strain induced in the direction of the maximum horizontal stress of the crack.
2. The method of claim 1, wherein selecting a reservoir retrofit mode based on the activated net pressure value comprises:
If the activation net pressure value is smaller than a first threshold value, selecting acidification modification;
if the activation net pressure value is greater than or equal to the first threshold value and less than or equal to a second threshold value, acid pressure modification is selected;
If the activation net pressure value is greater than the second threshold value, selecting a sand fracturing modification mode;
wherein the first threshold is less than the second threshold.
3. The method of claim 1, wherein determining the shear and normal stresses experienced by the fracture based on the overburden stress, the horizontal maximum principal stress, the horizontal minimum principal stress, the dip angle of each fracture, and the angle of each fracture strike to the horizontal maximum principal stress comprises:
the positive stress experienced by each crack was determined according to the following formula:
σn＝l2σH+m2σh+n2σv
the shear stress to which each crack is subjected is determined according to the following formula:
τn＝(l2σH 2+m2σh 2+n2σv 2-σh 2)1/2
Where l=sinθ×sinα; m=cos θ×cos α; n=cos α;
σ n is the normal stress to which the crack is subjected; τ n is the shear stress to which the crack is subjected; alpha is the inclination angle of the crack; θ is the angle between the direction of the crack and the direction of the horizontal maximum principal stress of the crack.
4. A method according to claim 3, wherein said determining a first minimum pressurization pressure required for the fracture to be activated based on said shear stress and said positive stress comprises:
The first minimum pressurization pressure required when each fracture is activated is determined according to the following formula:
Wherein P in is the first minimum pressurization pressure required when each fracture is activated; mu is the friction coefficient of the joint surface of the crack.
5. A device for selecting a modification mode of a fractured reservoir, comprising:
A first determining module for determining a first minimum pressurization pressure required when each fracture is activated among M fractures in the reservoir;
The second determining module is used for determining a second minimum pressurizing pressure required when the N cracks are activated according to the first minimum pressurizing pressure corresponding to each crack; the second minimum pressurizing pressure is one of M first minimum pressurizing pressures, M and N are positive integers, and N is smaller than or equal to M;
a third determining module, configured to determine an activation net pressure value of the crack corresponding to the second minimum pressurization pressure according to the second minimum pressurization pressure and a horizontal minimum principal stress of the crack corresponding to the second minimum pressurization pressure;
the selection module is used for selecting a modification mode of the reservoir according to the activated net pressure value; the modification mode comprises acidification modification, acid fracturing modification or sand fracturing modification;
The first determining module is specifically configured to:
Determining the overburden stress, the horizontal maximum principal stress and the horizontal minimum principal stress of each crack in M cracks in a reservoir;
determining the shear stress and the normal stress of the cracks according to the overlying stress, the horizontal maximum main stress, the horizontal minimum main stress, the inclination angle of each crack and the included angle between the trend of each crack and the horizontal maximum main stress;
determining the first minimum pressurization pressure required when the fracture is activated based on the shear stress and the normal stress;
The second determining module is specifically configured to:
Sequencing the first minimum pressurizing pressures corresponding to each crack in the M cracks, and determining N smaller first minimum pressurizing pressures;
determining the maximum value of the smaller N first minimum pressurizing pressures as a second minimum pressurizing pressure required when N cracks are activated;
The first determining module is specifically configured to:
the overburden stress for each fracture was determined according to the following formula:
Wherein σ v is the overburden stress of the crack; g is gravity acceleration; tvd is the vertical depth of the earth's surface to the formation; ρ b is the density curve of the reservoir;
The horizontal maximum principal stress for each crack was determined according to the following formula:
the horizontal minimum principal stress for each crack was determined according to the following formula:
Wherein σ H is the horizontal maximum principal stress of the crack; σ h is the horizontal minimum principal stress of the crack; v is poisson's ratio; σ v is the overburden stress of the crack; beta is an effective stress coefficient, and the value range is 0-1; p p is pore pressure; e is Young's modulus; epsilon h is the strain induced in the direction of the minimum horizontal stress of the crack and epsilon H is the strain induced in the direction of the maximum horizontal stress of the crack.
6. A device for selecting a mode of modification of a fractured reservoir, comprising: a memory and a processor; the memory is connected with the processor;
the memory is used for storing a computer program;
the processor, when executed by a computer program, is configured to implement a method for selecting a method for modifying a fractured reservoir according to any one of claims 1-4.
7. A storage medium having stored thereon a computer program which, when executed by a processor, implements a method of selecting a method of modifying a fractured reservoir according to any of the preceding claims 1-4.
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