CN111691863A

CN111691863A - Reservoir fracturing method and device

Info

Publication number: CN111691863A
Application number: CN201910193099.4A
Authority: CN
Inventors: 雷群; 甯波; 付宁海; 贾爱林; 郭智; 张燕明
Original assignee: Petrochina Co Ltd
Current assignee: Petrochina Co Ltd
Priority date: 2019-03-14
Filing date: 2019-03-14
Publication date: 2020-09-22
Anticipated expiration: 2039-03-14
Also published as: CN111691863B

Abstract

The invention discloses a reservoir fracturing method and a device, and the method comprises the following steps: determining an overlapping pattern of effective sand bodies according to the vertical section of the reservoir in the target area; determining a correlation coefficient of the geological parameter and the production index parameter by utilizing linear regression, and determining the geological parameter of which the correlation coefficient is greater than a preset correlation coefficient as a key geological parameter; the production index parameters at least comprise single well dynamic reserves; determining a fracturing geological mode of each horizontal well in a reservoir stratum of a target area according to the overlapping pattern of the effective sand bodies, the production index parameters and the key geological parameters; and determining fracturing parameters corresponding to the fracturing geological mode of each horizontal well by utilizing numerical simulation, and fracturing the reservoir in the target area according to the fracturing parameters. The method determines key geological parameters by using linear regression, adopts single-well dynamic reserves to represent production index parameters, and finally determines the fracturing parameters of each horizontal well by using numerical simulation, thereby overcoming the defect of determining the fracturing parameters by depending on experience and improving the reservoir fracturing effect.

Description

Reservoir fracturing method and device

Technical Field

The invention relates to the technical field of oil and gas development, in particular to a reservoir fracturing method and device.

Background

This section is intended to provide a background or context to the embodiments of the invention that are recited in the claims. The description herein is not admitted to be prior art by inclusion in this section.

The tight sandstone gas reservoir has poor physical property and weak seepage capability, and can not form natural capacity without reservoir fracturing modification. Along with the large-scale application of the horizontal well in the compact sandstone gas field, the fracturing of the horizontal well becomes a key for influencing the oil-gas productivity. Horizontal well fracturing is a high-input high-output production increasing development mode, the selection of fracturing parameters is very important due to the characteristics of high risk and high return, and the fracturing parameters of the horizontal well in the traditional technology are mostly determined by the experience of professional technicians, so that the expected fracturing effect cannot be achieved. Therefore, how to fully utilize reservoir geological conditions to optimize fracturing parameters and improve the fracturing effect to the maximum extent and finally realize oil and gas yield increase becomes an urgent problem to be solved.

Therefore, the existing fracturing of the tight sandstone gas reservoir horizontal well has the problem of poor fracturing effect caused by determining fracturing parameters by depending on experience.

Disclosure of Invention

The embodiment of the invention provides a reservoir fracturing method for improving the fracturing effect, which comprises the following steps:

determining an overlapping pattern of effective sand bodies according to the vertical section of the reservoir in the target area;

determining a correlation coefficient of the geological parameter and the production index parameter by utilizing linear regression, and determining the geological parameter of which the correlation coefficient is greater than a preset correlation coefficient as a key geological parameter; the production index parameters at least comprise single well dynamic reserves;

determining a fracturing geological mode of each horizontal well in a reservoir stratum of a target area according to the overlapping pattern of the effective sand bodies, the production index parameters and the key geological parameters;

and determining fracturing parameters corresponding to the fracturing geological mode of each horizontal well by utilizing numerical simulation, and fracturing the reservoir in the target area according to the fracturing parameters.

The embodiment of the invention also provides a reservoir fracturing device, which is used for improving the fracturing effect and comprises the following components:

the stacking pattern determining module is used for determining the stacking pattern of the effective sand body according to the vertical section of the reservoir in the target area;

the key geological parameter determining module is used for determining a correlation coefficient of the geological parameter and the production index parameter by utilizing linear regression, and determining the geological parameter of which the correlation coefficient is larger than a preset correlation coefficient as the key geological parameter; the production index parameters at least comprise single well dynamic reserves;

the fracturing geological pattern determining module is used for determining the fracturing geological pattern of each horizontal well in the reservoir of the target area according to the overlapping pattern of the effective sand bodies, the production index parameters and the key geological parameters;

and the fracturing parameter determining module is used for determining fracturing parameters corresponding to the fracturing geological mode of each horizontal well by utilizing numerical simulation and fracturing the reservoir in the target area according to the fracturing parameters.

The embodiment of the invention also provides computer equipment which comprises a memory, a processor and a computer program which is stored on the memory and can run on the processor, wherein the processor executes the computer program to realize the reservoir fracturing method.

Embodiments of the present invention also provide a computer-readable storage medium storing a computer program for executing the above-mentioned reservoir fracturing method.

In the embodiment of the invention, the overlapping pattern of the effective sand bodies is determined according to the vertical section of the reservoir in the target area; determining a correlation coefficient of the geological parameter and the production index parameter by utilizing linear regression, and determining the geological parameter of which the correlation coefficient is greater than a preset correlation coefficient as a key geological parameter; the production index parameters at least comprise single well dynamic reserves; determining a fracturing geological mode of each horizontal well in a reservoir stratum of a target area according to the overlapping pattern of the effective sand bodies, the production index parameters and the key geological parameters; and determining fracturing parameters corresponding to the fracturing geological mode of each horizontal well by utilizing numerical simulation, and fracturing the reservoir in the target area according to the fracturing parameters. According to the embodiment of the invention, the key geological parameters are determined by linear regression, the single-well dynamic reserve is adopted to represent the production index parameters, and finally the fracturing parameters of each horizontal well are determined by numerical simulation, so that the defect of determining the fracturing parameters by depending on experience is overcome, and the reservoir fracturing effect is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts. In the drawings:

FIG. 1 is a flow chart of an implementation of a reservoir fracturing method provided by an embodiment of the invention;

fig. 2 is a flow chart illustrating the implementation of step 104 in the reservoir fracturing method provided by the embodiment of the invention;

FIG. 3 is a functional block diagram of a reservoir fracturing apparatus provided by an embodiment of the present invention;

FIG. 4 is a block diagram of a fracturing parameter determination module in a reservoir fracturing apparatus according to an embodiment of the present invention;

FIG. 5 is a vertical section of a reservoir in a region provided by an embodiment of the present invention;

FIG. 6 is a well trajectory profile of a horizontal well (H1) in a reservoir in a region provided by an embodiment of the present invention;

FIG. 7 is a schematic diagram of different fractured geologic patterns in a reservoir in a region provided by an embodiment of the invention;

FIG. 8 is a schematic diagram of fracturing modes and parameters of different fractured geological modes of a reservoir in a certain region according to an embodiment of the invention;

fig. 9 is a schematic diagram of a fractured geologic pattern of a horizontal well (W1) in a reservoir in a certain region according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention are further described in detail below with reference to the accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.

Although the present invention provides the method operation steps or apparatus structures as shown in the following embodiments or figures, more or less operation steps or module units may be included in the method or apparatus based on conventional or non-inventive labor. In the case of steps or structures which do not logically have the necessary cause and effect relationship, the execution order of the steps or the block structure of the apparatus is not limited to the execution order or the block structure shown in the embodiment or the drawings of the present invention. The described methods or modular structures, when applied in an actual device or end product, may be executed sequentially or in parallel according to embodiments or the methods or modular structures shown in the figures.

Aiming at the defect of poor fracturing effect caused by the fact that fracturing parameters are determined by means of experience in the prior art, the applicant of the invention provides a reservoir fracturing method and a reservoir fracturing device.

Fig. 1 illustrates a flow chart of implementing the reservoir fracturing method provided by the embodiment of the invention, and for convenience of description, only the parts related to the embodiment of the invention are illustrated, and the details are as follows:

as shown in fig. 1, a reservoir fracturing method, comprising:

step 101, determining an overlapping pattern of effective sand bodies according to a vertical section of a reservoir stratum of a target area;

step 102, determining a correlation coefficient of the geological parameter and the production index parameter by utilizing linear regression, and determining the geological parameter of which the correlation coefficient is greater than a preset correlation coefficient as a key geological parameter; the production index parameters at least comprise single well dynamic reserves;

103, determining a fracturing geological mode of each horizontal well in a reservoir stratum of the target area according to the overlapping pattern of the effective sand bodies, the production index parameters and the key geological parameters;

and 104, determining fracturing parameters corresponding to the fracturing geological mode of each horizontal well by using numerical simulation, and fracturing the reservoir in the target area according to the fracturing parameters.

A reservoir refers to a rock formation having interconnected pores that allow for the storage and percolation of hydrocarbons therein. The reservoir capacity of a reservoir is determined by the petrophysical properties of the reservoir, typically including its porosity, permeability; porosity determines the storage capacity of the reservoir and permeability determines the seepage capacity of the storage in the reservoir.

The vertical section of the reservoir of the target area refers to a section of the reservoir area of the target area which is perpendicular to the ground level. The effective sand body refers to a sand body containing an air layer. The overlapping pattern refers to the combination form and contact relationship between the effective sand bodies.

When determining the stacking pattern of the reservoir of the target area, the stacking pattern of the reservoir of the target area can be determined by observing the vertical section of the reservoir of the target area.

In an embodiment of the invention, the stacking pattern comprises one or more of:

a bulk thick layer type stacking pattern, a multi-stage stacking type stacking pattern, a local concentrated type stacking pattern, and a dispersed isolated type stacking pattern.

Linear regression is a statistical analysis method that uses regression analysis in mathematical statistics to determine the interdependent quantitative relationships between two or more variables, and is widely used. In embodiments of the invention, linear regression is used to determine the correlation coefficient of the geological parameter and the production indicator parameter. The value of the correlation coefficient indicates the degree of interdependence of the geological parameter and the production index parameter.

The geological parameters are parameters that reflect characteristics of various aspects of the reservoir geology, and in one embodiment of the invention, the geological parameters include one or more of the following:

the length of the reservoir sand body, the length of the reservoir effective sand body, the thickness of the reservoir effective sand body, the drilling rate of the reservoir and the development interval of a choking zone.

And determining the development interval of a choking zone in the effective sand body according to the well track profile of the horizontal well in the reservoir stratum of the target area.

In an embodiment of the invention, in order to further improve the fracturing effect, the geological parameters further include porosity, permeability and gas saturation of the reservoir in the target area.

Wherein, the porosity refers to the ratio of the sum of all pore space volumes in the rock sample to the volume of the rock sample, and is called the total porosity of the rock. The porosity of the reservoir in the target area refers to the ratio of the pore volume of the reservoir in the target area to the reservoir volume in the target area.

Permeability, which means the ability of a rock to allow fluid to pass through under a certain pressure difference, is a parameter that characterizes the ability of the rock itself to conduct fluid, and the size is related to factors such as porosity, pore geometry in the direction of fluid penetration, particle size and arrangement direction, and is not related to the properties of the fluid moving in the medium. The permeability of the reservoir in the target area refers to the capacity of the reservoir in the target area to allow fluid to pass through under a certain pressure difference.

Gas saturation, which refers to the volume of natural gas in a reservoir as a percentage of the volume of interconnected pores in the original state. The gas saturation of the reservoir in the target area refers to the percentage of the volume of natural gas in the reservoir in the target area in the volume of the communicated pores in the reservoir in the target area.

The reservoir sand body refers to reservoir sand body, which is formed by dividing a rock stratum with higher permeability into a plurality of independent sand layer individuals which are not communicated with each other by other rock stratum with lower permeability due to lithological change in a reservoir.

The effective sand thickness of the reservoir refers to the thickness of a part with oil (gas) production capacity in an oil (gas) layer, and is also called the effective thickness of the oil (gas) layer.

The reservoir drilling rate is the percentage of the number of wells in the reservoir in the target area, which are drilled with oil (gas), in the reservoir statistical area in the target area, and is a parameter representing the size of the distribution area of the oil (gas) layer.

The choke zone, the concept of which derives from well test and production dynamics data interpretation, generally represents an impermeable barrier zone that impedes fluid flow, similar to the compartment in reservoir sedimentology analysis. The development interval of the choking bands can be represented by the transverse spacing between the adjacent choking bands.

Specifically, the development interval of the choking zone in the effective sand body can be determined according to the well track section of the horizontal well in the reservoir of the target area, wherein the well track section of the horizontal well is a section perpendicular to the ground level.

The production index parameter refers to a parameter capable of reflecting or influencing the long-term production capacity of the horizontal well. In conventional evaluation, the throughput is generally expressed by a non-resistance flow rate. In the embodiment of the invention, the production effect of the horizontal well is evaluated by adopting the dynamic reserve of the single well, and the long-term production capacity of the horizontal well can be more accurately reflected than the unimpeded flow.

In an embodiment of the invention, the single well dynamic reserve of the horizontal well may be determined by any one of the following methods:

modern yield decreasing analysis method, agar-Gardner (A.G) yield decreasing analysis method, Normalized Pressure Integral (NPI) yield decreasing analysis method, Transient yield decreasing analysis method, and Flow Material Balance (FMB) yield decreasing analysis method.

In an embodiment of the invention, the production indicator parameter further comprises one or more of:

unobstructed flow, initial production and predicted final recoverable yield.

The unimpeded flow refers to the daily gas production rate under the condition that the bottom hole flow pressure is equal to 1 atmosphere when the gas well is opened for production. The initial production refers to the average production 3 months prior to the production of the gas well. The estimation of the final recoverable amount refers to the estimation of the final recoverable amount of the well which is produced for more than years and is estimated by using a trend prediction method according to the capacity decreasing rule.

In the embodiment of the present invention, the preset correlation coefficient is a preset correlation coefficient, and those skilled in the art can understand that a value of the correlation coefficient may be preset according to a specific situation and an actual requirement, which is not limited in particular in the embodiment of the present invention.

Furthermore, after the stacking pattern, the production index parameter and the key geological parameter of the effective sand body are determined, the fracturing geological pattern of each horizontal well in the reservoir of the target area can be determined according to the stacking pattern, the production index parameter and the key geological parameter of the effective sand body, wherein the fracturing geological pattern is corresponding to each horizontal well, and therefore the corresponding reservoir can be fractured by the fracturing geological pattern corresponding to the horizontal well.

In an embodiment of the invention, the fractured geologic pattern comprises one or more of:

a massive thick-layer type fracturing geological mode, a multi-stage superposed type fracturing geological mode, a local concentrated type fracturing geological mode and a dispersed isolated type fracturing geological mode.

After the fracturing geological mode of each horizontal well in the reservoir of the target area is determined, fracturing parameters corresponding to the fracturing geological mode of each horizontal well are determined by a numerical simulation method, and then the reservoir of the target area is fractured according to the fracturing parameters corresponding to each horizontal well.

The numerical simulation method, also called computer simulation, refers to a method of numerical calculation and image display by means of an electronic computer in combination with a finite element or finite volume concept, so as to achieve the purpose of researching engineering problems or physical problems and various natural problems. In the embodiment of the invention, the fracturing parameters corresponding to the fracturing geological pattern of each horizontal well are determined through numerical simulation.

In the embodiment of the invention, the stacking pattern of the effective sand bodies is determined according to the vertical section of the reservoir of the target area; determining a correlation coefficient of the geological parameter and the production index parameter by utilizing linear regression, and determining the geological parameter of which the correlation coefficient is greater than a preset correlation coefficient as a key geological parameter; the production index parameters at least comprise single well dynamic reserves; determining a fracturing geological mode of each horizontal well in a reservoir stratum of a target area according to the overlapping pattern of the effective sand bodies, the production index parameters and the key geological parameters; and determining fracturing parameters corresponding to the fracturing geological mode of each horizontal well by utilizing numerical simulation, and fracturing the reservoir in the target area according to the fracturing parameters. According to the embodiment of the invention, the key geological parameters are determined by linear regression, the single-well dynamic reserve is adopted to represent the production index parameters, and finally the fracturing parameters of each horizontal well are determined by numerical simulation, so that the defect of determining the fracturing parameters by depending on experience is overcome, and the reservoir fracturing effect is improved.

In an embodiment of the present invention, in order to further improve the fracturing effect, on the basis of the above method steps, the reservoir fracturing method further includes:

and determining the scale of the effective sand body according to the vertical section and/or the horizontal section of the reservoir in the target area.

The vertical section of the target area reservoir refers to a section of the target area reservoir perpendicular to the ground level, and the horizontal section of the target area reservoir refers to a section of the target area reservoir parallel to the ground level. In embodiments of the invention, the size scale of the effective sand may be determined from the vertical profile and/or the horizontal profile of the reservoir in the target region. The scale of the effective sand body can be evaluated through parameters such as the length of the effective sand body, the thickness of the effective sand body and the like.

In an embodiment of the invention, in order to further improve the fracturing effect, the scale of the choking zone in the effective sand body is also determined according to the well trajectory profile of the horizontal well in the reservoir of the target area. The scale of the flow blocking bands can be evaluated by the width of the flow blocking bands and/or the lateral spacing between adjacent flow blocking bands.

In an embodiment of the present invention, the geological parameters further include a frequency of a choke zone in the effective sand body, the frequency of the choke zone is a number of choke zones per unit length in the well trajectory, and the reservoir fracturing method further includes: and determining the frequency of a choking zone in the effective sand body according to the well track profile of the horizontal well in the reservoir of the target area.

The frequency of the choke zone may be the number of the choke zone within a length of 1000 meters, or may also be the number of the choke zones within other unit lengths, which is not particularly limited in the embodiment of the present invention.

Furthermore, any one of the geological parameters: the length of the reservoir sand body, the length of the reservoir effective sand body, the thickness of the reservoir effective sand body, the drilling rate of the reservoir and the development interval of the choking zone are all possibly converted into key geological parameters, and when a certain geological parameter is determined to be the key geological parameter, the geological parameter is converted into the key geological parameter.

When the fracturing geological pattern of each horizontal well in the reservoir of the target area is determined according to the stacking pattern of the effective sand bodies, the production index parameter and the key geological parameter, the fracturing geological pattern of each horizontal well in the reservoir of the target area can be determined according to the range of the geological parameter and the production index parameter in the following table, and when the key geological parameter meets the range of the geological parameter in the following table, the fracturing geological pattern of each horizontal well in the reservoir of the target area is determined according to the corresponding stacking pattern.

Watch 1

In an embodiment of the present invention, in order to further improve the fracturing effect, when the stacking pattern is a massive thick layer stacking pattern, the fractured geological pattern is a massive thick layer fractured geological pattern, and the geological parameters satisfy the following conditions:

the length of the reservoir sand body is not less than the length of a first preset reservoir sand body; and/or

The effective sand body length of the reservoir is not less than the effective sand body length of the first preset reservoir; and/or

The effective sand thickness of the reservoir is not less than the effective sand thickness of the first preset reservoir; and/or

The reservoir drilling rate is not less than a first preset reservoir drilling rate; and/or

The growth interval of the choking zone is not less than the first preset growth interval of the choking zone.

Namely, under the condition that the stacking pattern of the effective sand body is a blocky thick-layer stacking pattern and the (key) geological parameters meet the condition range, determining that the fracturing geological pattern of a certain horizontal well in the reservoir of the target area is a blocky thick-layer fracturing geological pattern.

Referring to table one, in an embodiment of the present invention, the first predetermined reservoir sand length, the first predetermined reservoir effective sand thickness, the first predetermined reservoir drilling rate, and the first predetermined choke zone development interval are respectively set to 850m, 700m, 6.0m, 60%, and 150 m.

When the superposed pattern is a massive thick-layer type superposed pattern, and the fracturing geological pattern is a massive thick-layer type fracturing geological pattern, the (key) geological parameters meet the following requirements: the length of the reservoir sand body is not less than 850m, the length of the reservoir effective sand body is not less than 700m, the thickness of the reservoir effective sand body is not less than 6.0m, the drilling rate of the reservoir is not less than 60%, and the development interval of the choke zone is not less than 150 m.

The first preset reservoir sand body length, the first preset reservoir effective sand body thickness, the first preset reservoir drilling rate and the first preset choke zone development interval are all preset geological parameters, and it can be understood by those skilled in the art that the geological parameters can be preset to other numerical values besides the numerical values according to specific situations and actual requirements, and the embodiment of the invention does not particularly limit the values.

In an embodiment of the present invention, in order to further improve the fracturing effect, when the stacking pattern is a multi-stage stacking type stacking pattern, the fractured geological pattern is a multi-stage stacking type fractured geological pattern, and the geological parameters satisfy the following conditions:

the reservoir sand body length is smaller than the first preset reservoir sand body length and not smaller than the second preset reservoir sand body length; and/or

The effective sand body length of the reservoir is smaller than the effective sand body length of a first preset reservoir and not smaller than the effective sand body length of a second preset reservoir; and/or

The effective sand body thickness of the reservoir is smaller than the effective sand body thickness of the first preset reservoir and not smaller than the effective sand body thickness of the second preset reservoir; and/or

The reservoir drilling rate is smaller than the first preset reservoir drilling rate and not smaller than the second preset reservoir drilling rate; and/or

The growth interval of the choking zone is smaller than the first preset choking zone growth interval and not smaller than the second preset choking zone growth interval.

Namely, under the condition that the stacking pattern of the effective sand body is a multi-phase stacking pattern and the (key) geological parameters meet the condition range, determining that the fracturing geological pattern of a certain horizontal well in the reservoir of the target area is a multi-phase stacking fracturing geological pattern.

Referring to table one, in an embodiment of the present invention, the second predetermined reservoir sand length, the second predetermined reservoir effective sand thickness, the second predetermined reservoir drilling rate, and the second predetermined choke zone development interval are respectively 800m, 550m, 5.5m, 50%, and 120 m.

When the superposed style is a multi-stage superposed type superposed style, and the fractured geological model is a multi-stage superposed type fractured geological model, the (key) geological parameters meet the following conditions: the length of the reservoir sand body is less than 850m and not less than 800m, the length of the reservoir effective sand body is not less than 700m and not less than 550m, the thickness of the reservoir effective sand body is less than 6.0m and not less than 5.5m, the reservoir drilling rate is less than 60% and not less than 50%, and the development interval of the choke zone is less than 150m and not less than 120 m.

The second preset reservoir sand body length, the second preset reservoir effective sand body thickness, the second preset reservoir drilling rate and the second preset choke zone development interval are all preset geological parameters, and it can be understood by those skilled in the art that the geological parameters can be preset to other numerical values besides the numerical values according to specific situations and actual requirements, and the embodiment of the invention does not particularly limit the geological parameters.

In an embodiment of the present invention, in order to further improve the fracturing effect, when the stacking pattern is a local concentration type stacking pattern, the fracturing geological pattern is a local concentration type fracturing geological pattern, and the geological parameters satisfy the following conditions:

the reservoir sand body length is smaller than the second preset reservoir sand body length and not smaller than the third preset reservoir sand body length; and/or

The effective sand body length of the reservoir is smaller than the effective sand body length of a second preset reservoir and not smaller than the effective sand body length of a third preset reservoir; and/or

The effective sand body thickness of the reservoir is smaller than the effective sand body thickness of the second preset reservoir and not smaller than the effective sand body thickness of the third preset reservoir; and/or

The reservoir drilling rate is smaller than the second preset reservoir drilling rate and not smaller than the third preset reservoir drilling rate; and/or

The growth interval of the choking zone is smaller than the second preset choking zone growth interval and not smaller than the third preset choking zone growth interval.

Namely, under the condition that the stacking pattern of the effective sand body is a local concentrated stacking pattern and the (key) geological parameters meet the condition range, determining that the fracturing geological pattern of a certain horizontal well in the reservoir of the target area is a local concentrated fracturing geological pattern.

Referring to table one, in an embodiment of the present invention, the third predetermined reservoir sand length, the third predetermined reservoir effective sand thickness, the third predetermined reservoir drilling rate, and the third predetermined choke zone development interval are respectively 750m, 450m, 5.5m, 45%, and 90 m.

When the superposed style is a local concentrated superposed style, and the fracturing geological mode is a local concentrated fracturing geological mode, the (key) geological parameters meet the following conditions: the length of the reservoir sand body is less than 800m and not less than 750m, the length of the reservoir effective sand body is not less than 550m and not less than 450m, the thickness of the reservoir effective sand body is less than 5.5m and not less than 5.5m, the reservoir drilling rate is less than 50% and not less than 45%, the interval between the development of choke zones is less than 120m and not less than 90 m.

The third preset reservoir sand body length, the third preset reservoir effective sand body thickness, the third preset reservoir drilling rate and the third preset choke zone development interval are all preset geological parameters, and it can be understood by those skilled in the art that the geological parameters can be preset to other numerical values besides the numerical values according to specific situations and actual requirements, and the embodiment of the invention does not particularly limit the values.

In an embodiment of the present invention, in order to further improve the fracturing effect, when the stacking pattern is a dispersed isolated type stacking pattern, the fractured geological pattern is a dispersed isolated type fractured geological pattern, and the geological parameters satisfy the following conditions:

the length of the reservoir sand body is smaller than the length of a third preset reservoir sand body; and/or

The effective sand body length of the reservoir is smaller than the effective sand body length of a third preset reservoir; and/or

The effective sand thickness of the reservoir is smaller than the effective sand thickness of a third preset reservoir; and/or

The reservoir drilling rate is smaller than a third preset reservoir drilling rate; and/or

The growth interval of the choking zone is smaller than the third preset growth interval of the choking zone.

Namely, under the condition that the stacking pattern of the effective sand body is a dispersive isolated type stacking pattern and the (key) geological parameters meet the condition range, determining that the fracturing geological pattern of a certain horizontal well in the reservoir of the target area is a dispersive isolated type fracturing geological pattern.

Referring to table one, in an embodiment of the present invention, when the stacking pattern is a dispersed isolated type stacking pattern, and the fractured geologic pattern is a dispersed isolated type fractured geologic pattern, the (key) geologic parameters satisfy: the length of the reservoir sand body is less than 750m, the length of the reservoir effective sand body is less than 450m, the thickness of the reservoir effective sand body is less than 5.5m, the drilling rate of the reservoir is less than 45%, and the development interval of the choke zone is less than 90 m.

In an embodiment of the present invention, in order to further improve the fracturing effect, when the stacking pattern is a massive thick layer stacking pattern, the fracturing geological pattern is a massive thick layer fracturing geological pattern, and the production index parameters satisfy the following conditions:

the single-well dynamic reserve is not less than a first preset single-well dynamic reserve; and/or

The non-resistance flow is not less than a first preset non-resistance flow; and/or

The initial yield is not less than a first preset initial yield; and/or

The estimated final recoverable capacity is not less than the first preset estimated final recoverable capacity.

Referring to table one, in an embodiment of the present invention, the predetermined first predetermined single well dynamic reserve, the predetermined first non-resistance flow rate, the predetermined first initial production rate and the predetermined first estimated final recoverable rate are 8200 (unit 10)⁴m³Same below), 25 (unit 10)⁴m³D, same below), 15 (unit 10)⁴m³D, same below) and 7000 (unit 10)⁴m³The same applies below).

When the superposed pattern is a massive thick-layer type superposed pattern and the fracturing geological pattern is a massive thick-layer type fracturing geological pattern, the production index parameters meet the following requirements: the dynamic reserve of a single well is not less than 8200, the unimpeded flow is not less than 25, the initial yield is not less than 15, and the estimated final recoverable yield is not less than 7000.

The first preset single-well dynamic reserve, the first preset non-resistance flow, the first preset initial yield and the first preset estimated final recoverable quantity are preset production index parameters, and those skilled in the art can understand that the production index parameters can be preset to other values besides the above values according to specific situations and actual requirements, which is not limited in particular by the embodiment of the present invention.

In an embodiment of the present invention, in order to further improve the fracturing effect, when the stacking pattern is a multi-stage stacking type stacking pattern, the fractured geological pattern is a multi-stage stacking type fractured geological pattern, and the production index parameter satisfies the following conditions:

the single-well dynamic reserve is less than a first preset single-well dynamic reserve and not less than a second preset single-well dynamic reserve; and/or

The non-resistance flow is smaller than a first preset non-resistance flow and not smaller than a second preset non-resistance flow; and/or

The initial yield is less than a first preset initial yield and not less than a second preset initial yield; and/or

The estimated final achievable amount is smaller than the first preset estimated final achievable amount and not smaller than the second preset estimated final achievable amount.

Referring to table one, in an embodiment of the present invention, the predetermined second predetermined single well dynamic reserves, the predetermined second non-resistance flow, the predetermined initial production and the predetermined second estimated final recoverable amount are 6000, 15, 10 and 5000 respectively.

When the superposed pattern is a multi-stage superposed type superposed pattern and the fracturing geological pattern is a multi-stage superposed type fracturing geological pattern, the production index parameters meet the following requirements: the dynamic reserve of a single well is not less than 6000, the unimpeded flow is not less than 15, the initial yield is not less than 10, and the estimated final recoverable yield is not less than 5000.

The second preset single-well dynamic reserve, the second preset non-resistance flow, the second preset initial yield and the second preset estimated final recoverable quantity are preset production index parameters, and those skilled in the art can understand that the production index parameters can be preset to other values besides the above values according to specific situations and actual requirements, which is not limited in particular by the embodiment of the present invention.

In an embodiment of the present invention, in order to further improve the fracturing effect, when the stacking pattern is a local concentration type stacking pattern, the fracturing geological pattern is a local concentration type fracturing geological pattern, and the production index parameters satisfy the following conditions:

the single-well dynamic reserve is less than the second preset single-well dynamic reserve and not less than the third preset single-well dynamic reserve; and/or

The non-resistance flow is smaller than the second preset non-resistance flow and not smaller than the third preset non-resistance flow; and/or

The initial yield is less than a second preset initial yield and not less than a third preset initial yield; and/or

The estimated final achievable amount is smaller than the second preset estimated final achievable amount and not smaller than the third preset estimated final achievable amount.

In an embodiment of the present invention, the preset third preset single well dynamic reserve, the preset third non-stop flow rate, the preset third initial production and the preset third estimated final producible amount are 3500, 15, 5 and 3000, respectively.

Referring to table one, in an embodiment of the present invention, when the stacking pattern is a local concentration type stacking pattern and the fractured geological pattern is a local concentration type fractured geological pattern, the production index parameter satisfies: the dynamic reserve of a single well is less than 6000 and not less than 3500, the unimpeded flow is less than 15 and not less than 5, the initial yield is less than 10 and not less than 5, and the estimated final recoverable yield is less than 5000 and not less than 3000.

The third preset single-well dynamic reserve, the third preset non-resistance flow, the third preset initial yield and the third preset estimated final recoverable quantity are preset production index parameters, and those skilled in the art can understand that the production index parameters can be preset to other values besides the above values according to specific situations and actual requirements, which is not limited in particular by the embodiment of the present invention.

In an embodiment of the present invention, in order to further improve the fracturing effect, when the stacking pattern is a dispersed isolated type stacking pattern, the fracturing geological pattern is a dispersed isolated type fracturing geological pattern, and the production index parameters satisfy the following conditions:

the single-well dynamic reserve is less than a third preset single-well dynamic reserve; and/or

The unimpeded flow is smaller than a third preset unimpeded flow; and/or

The initial yield is less than a third preset initial yield; and/or

The estimated final recoverable capacity is smaller than a third preset estimated final recoverable capacity.

When the superposed pattern is a dispersed isolated superposed pattern and the fracturing geological pattern is a dispersed isolated fracturing geological pattern, the production index parameters meet the following requirements: the dynamic reserve of a single well is less than 3500, the unimpeded flow is less than 5, the initial yield is less than 5, and the estimated final recoverable yield is less than 3000.

In an embodiment of the invention, in order to further improve the fracturing effect, a fracturing mode corresponding to the fracturing geological mode of each horizontal well is determined by using numerical simulation, and the reservoir of the target area is fractured according to the fracturing mode and fracturing parameters.

The fracturing mode refers to a fracturing mode for a reservoir stratum and an effective reservoir stratum and the number of fracturing sections of the reservoir stratum and the effective reservoir stratum. For example, the method comprises fracturing the reservoir and the effective reservoir respectively, or simultaneously fracturing the reservoir and the effective reservoir, fracturing multiple sections of the reservoir without fracturing the effective reservoir, or fracturing multiple sections of the effective reservoir without fracturing the reservoir, or fracturing multiple sections of the reservoir and the effective reservoir at the same time, or fracturing both the reservoir and the effective reservoir.

Fig. 2 shows an implementation flow of step 104 in the reservoir fracturing method provided by the embodiment of the present invention, and for convenience of description, only the parts related to the embodiment of the present invention are shown, and detailed as follows:

in an embodiment of the present invention, in order to further improve the fracturing effect, as shown in fig. 2, step 104, determining a fracturing parameter corresponding to the fractured geological pattern of each horizontal well by using numerical simulation, and fracturing the reservoir in the target region according to the fracturing parameter includes:

step 201, determining constraint conditions of fracturing parameters;

and 202, determining the fracturing parameters of each horizontal well by using numerical simulation according to the constraint conditions of the fracturing parameters, and fracturing the reservoir in the target area according to the fracturing parameters.

In an embodiment of the present invention, the constraint condition of the fracture parameter may be specifically determined by the following formula:

ΔG×M＞C；

wherein Δ G represents the increased gas production per additional fracture; m represents the yield of unit gas production; c represents the added cost per added fracture.

According to the formula, when the benefit of increasing the fracturing fracture of a certain horizontal well in the reservoir of the target area is determined to be larger than the cost of increasing the fracturing fracture by utilizing numerical simulation, the number of the increased fracturing fractures, namely the fracturing parameter of each horizontal well, is increased, and then the reservoir of the target area is fractured according to the fracturing parameter of each horizontal well.

Wherein, in an embodiment of the invention, the fracturing parameters include a benefit of increasing the fracture greater than a number of fractures increased when a cost of the fracture is increased.

Embodiments of the present invention also provide a reservoir fracturing apparatus, as described in the examples below. Since the principle of solving the problems of the devices is similar to that of a reservoir fracturing method, the implementation of the devices can be referred to the implementation of the method, and repeated details are not repeated.

Fig. 3 shows functional modules of a reservoir fracturing apparatus provided by an embodiment of the present invention, and for convenience of explanation, only parts related to the embodiment of the present invention are shown, and detailed as follows:

referring to fig. 3, each module included in the reservoir fracturing apparatus is used to execute each step in the embodiment corresponding to fig. 1, and specific reference is made to fig. 1 and the related description in the embodiment corresponding to fig. 1, which are not repeated herein. In the embodiment of the present invention, the reservoir fracturing device includes a stacking pattern determining module 301, a key geological parameter determining module 302, a fracturing geological pattern determining module 303, and a fracturing parameter determining module 304.

The stacking pattern determining module 301 is used for determining the stacking pattern of the effective sand bodies according to the vertical section of the reservoir of the target area;

the key geological parameter determining module 302 is configured to determine a correlation coefficient between a geological parameter and a production index parameter by using linear regression, and determine a geological parameter, of which the correlation coefficient is greater than a preset correlation coefficient, as a key geological parameter; the production index parameters at least comprise single well dynamic reserves;

the fracturing geological pattern determination module 303 is used for determining the fracturing geological pattern of each horizontal well in the reservoir of the target area according to the overlapping pattern of the effective sand bodies, the production index parameters and the key geological parameters;

and a fracturing parameter determining module 304, configured to determine a fracturing parameter corresponding to the fracturing geological pattern of each horizontal well by using numerical simulation, and fracture the reservoir in the target region according to the fracturing parameter.

In an embodiment of the present invention, the stacking pattern determination module 301 determines a stacking pattern of effective sand bodies according to a vertical profile of a reservoir of a target region; the key geological parameter determination module 302 determines a correlation coefficient between the geological parameter and the production index parameter by using linear regression, and determines the geological parameter with the correlation coefficient larger than a preset correlation coefficient as the key geological parameter; the production index parameters at least comprise single well dynamic reserves; the fracturing geological pattern determination module 303 determines the fracturing geological pattern of each horizontal well in the reservoir of the target area according to the superposition pattern of the effective sand bodies, the production index parameters and the key geological parameters; the fracturing parameter determination module 304 determines fracturing parameters corresponding to the fracturing geological pattern of each horizontal well by using numerical simulation, and fractures the reservoir in the target area according to the fracturing parameters. According to the embodiment of the invention, the key geological parameter determining module 302 determines the key geological parameter by using linear regression, the single-well dynamic reserve is adopted to represent the production index parameter, and finally the fracturing parameter determining module 304 determines the fracturing parameter of each horizontal well by using numerical simulation, so that the defect of determining the fracturing parameter by depending on experience is overcome, and the reservoir fracturing effect is improved.

In an embodiment of the present invention, in order to further improve the fracturing effect, on the basis of the above module structure, the reservoir fracturing apparatus further includes:

and the effective sand body scale determining module is used for determining the scale of the effective sand body according to the vertical section and/or the horizontal section of the reservoir in the target area.

a block-shaped thick-layer type stacking pattern, a multi-stage stacking type stacking pattern, a local concentrated type stacking pattern, and a dispersed isolated type stacking pattern;

the fractured geologic pattern includes one or more of:

In an embodiment of the invention, the geological parameters comprise one or more of:

In an embodiment of the present invention, the reservoir fracturing apparatus further includes a development interval determining module, configured to determine a development interval of a choking zone in the effective sand body according to a well trajectory profile of a horizontal well in the reservoir in the target region.

In an embodiment of the present invention, the reservoir fracturing apparatus further includes a choking zone size determination module, configured to determine a size of a choking zone in the effective sand body according to a well trajectory profile of a horizontal well in the reservoir in the target region.

In an embodiment of the present invention, the reservoir fracturing apparatus further includes a choking zone frequency determining module, configured to determine a frequency of a choking zone in the effective sand body according to a well trajectory profile of a horizontal well in the reservoir in the target region.

unobstructed flow, initial production and predicted final recoverable yield.

The initial yield is not less than a first preset initial yield; and/or

The unimpeded flow is smaller than a third preset unimpeded flow; and/or

The initial yield is less than a third preset initial yield; and/or

In an embodiment of the invention, in order to further improve the fracturing effect, the reservoir fracturing device further comprises a fracturing mode determining module, which is used for determining the fracturing mode corresponding to the fracturing geological mode of each horizontal well by using numerical simulation, and fracturing the reservoir in the target area according to the fracturing mode and the fracturing parameters.

Fig. 4 shows functional modules of the fracture parameter determination module 104 in the reservoir fracturing device provided by the embodiment of the invention, and for convenience of explanation, only the parts related to the embodiment of the invention are shown, and the details are as follows:

in an embodiment of the present invention, referring to fig. 4, in order to further improve the fracturing effect, each unit included in the fracturing parameter determining module 104 is configured to execute each step in the embodiment corresponding to fig. 2, and specifically, refer to fig. 2 and the related description in the embodiment corresponding to fig. 2, which is not described herein again. In this embodiment of the present invention, the fracture parameter determining module 104 includes a constraint condition determining unit 401 and a fracture parameter determining unit 402.

A constraint determining unit 401, configured to determine constraints of the fracture parameters.

And a fracturing parameter determining unit 402, configured to determine a fracturing parameter of each horizontal well by using numerical simulation according to constraint conditions of the fracturing parameters, and perform fracturing on a reservoir stratum of the target region according to the fracturing parameters.

In the embodiment of the present invention, the constraint condition determining unit 401 determines the constraint conditions of the fracturing parameters, the fracturing parameter determining unit 402 determines the fracturing parameters of each horizontal well by using numerical simulation according to the constraint conditions of the fracturing parameters, and fractures the reservoir in the target region according to the fracturing parameters, so as to further improve the fracturing effect.

The principles and functions of the present invention are further illustrated below with reference to examples:

fig. 5 is a vertical section of a reservoir in a certain region provided by an embodiment of the present invention, and for convenience of illustration, only the parts related to the embodiment of the present invention are shown, and detailed as follows:

as shown in fig. 5, according to the vertical section of the reservoir in the region, (with the interface approximately parallel to the upper surface of the reservoir in the region as a boundary), the reservoir in the region is divided into three layers, which are defined as F1 small layer, F2 small layer and F3 small layer from top to bottom. The statistics for each small layer are as follows:

watch two

As can be seen from fig. 5 and table two, the small sand layer of F2 has a larger thickness and better continuity in the transverse direction, the braided river system superposed belt is most developed, the small sand layer of F3 has a smaller thickness than the small sand layer of F2, and the braided river system superposed belt exists locally; f1 small layer sand is distributed dispersedly and insulatively, the overlapping zone of the braided river system is less developed, and the depression between the systems is more developed. The mud rock interlayer between the F1 small layer and the F2 small layer is unstable in distribution, large in local thickness and connected with local sand bodies; the mudstone distribution between the small F2 layer and the small F3 layer is stable, but the thickness is not changed greatly. The development degree of the effective sand body of the small layer (i.e., the thickness of the effective sand body of the small layer) is F2 small layer, F3 small layer and F1 small layer in this order from large to small. Accordingly, the effective sand stacking pattern can be determined according to fig. 5 and the second table.

Fig. 6 is a well trajectory profile of a horizontal well in a reservoir in a certain region according to an embodiment of the present invention, and for convenience of illustration, only the portion related to the embodiment of the present invention is shown, and the detailed description is as follows:

referring to fig. 6, the well trajectory profile of the horizontal well (for the convenience of the following description, denoted as H1 well) is analyzed to determine that the interior of the composite effective sand body of the horizontal well is not communicated, i.e. there are a plurality (as shown in fig. 6, the horizontal well is 5) "choke strips" (as shown by the circle positions in fig. 6).

In addition, the statistical results for the "choking zone" of several typical horizontal wells (H1, H2, H3, and H4) in the reservoir in this region are as follows:

watch III

The statistical results of all drilled horizontal well 'choking zones' in the reservoir in the region show that: the horizontal width of the choking belts is concentrated in the range of 20-30 meters, and the transverse spacing between adjacent choking belts is concentrated in the range of 100-200 meters.

Further, a correlation coefficient of the geological parameter and the production index parameter is determined by utilizing linear regression, and further a key geological parameter is determined. The analysis result shows that in the geological parameters of the reservoir in the region, the correlation coefficients of the reservoir sand body length, the reservoir effective sand body thickness and the production index parameters are higher than those of other geological parameters and the production index parameters. Therefore, the length of the reservoir sand body, the length of the reservoir effective sand body and the thickness of the reservoir effective sand body are determined as key geological parameters, namely the key geological parameters influencing the long-term production capacity of the fractured gas well comprise the length of the reservoir sand body, the length of the reservoir effective sand body and the thickness of the reservoir effective sand body.

Fig. 7 shows a schematic of the fractured geologic pattern of different horizontal wells in the reservoir in this region, only the portions relevant to embodiments of the invention are shown for ease of illustration, as detailed below:

referring to fig. 7, through research and summary on all horizontal wells in the reservoir in the region, according to different combination modes of four elements of reservoir effective sand thickness, choke zone, sand and mudstone, determining a fracturing geological pattern of the horizontal well in the reservoir in the target region mainly includes the following four types: block thick layer type, multi-stage stacked type, local concentrated type, and dispersed isolated type.

Fig. 8 shows the fracturing modes and fracturing parameters of different fractured geological patterns of a reservoir in a certain region, and for convenience of explanation, only the parts related to the embodiment of the invention are shown, and the details are as follows:

referring to fig. 8, a numerical simulation is used to establish a digital-analog model of each fractured geological pattern, and a fracturing parameter corresponding to each fractured geological pattern is determined according to the numerical model, so that the reservoir in the region is fractured by using the fracturing parameter.

As can be seen from fig. 8, for the fractured geologic pattern of the massive thick layer type, only the effective sand of the reservoir may be uniformly fractured, for example, the effective sand of the reservoir fractures 8 sections; aiming at a multi-stage superposed fracturing geological mode, effective sand bodies of a fracturing reservoir stratum are mainly used, and the sand bodies of the reservoir stratum are fractured individually, for example, the effective sand bodies of the reservoir stratum are fractured for 6 sections, and the sand bodies of the reservoir stratum are fractured for 1 section; for a local centralized fracturing geological mode, simultaneously fracturing a reservoir effective sand body and a reservoir sand body, for example, fracturing 4 sections of the reservoir effective sand body and fracturing 3 sections of the reservoir sand body; for a dispersed isolated fractured geologic mode, a reservoir effective sand body and a reservoir sand body existing in isolation are fractured, for example, the reservoir effective sand body fractures 2 sections, and the reservoir sand body fractures 1 section.

Fig. 9 is a schematic of the fractured geologic pattern of a W1 horizontal well in the reservoir in this region, showing only those portions relevant to embodiments of the invention for ease of illustration, as detailed below:

through analysis of the well trajectory profile of the W1 horizontal well, the statistical data were as follows:

watch four

According to different fracturing geological modes, a targeted fracturing construction design scheme of a one-well-one-scheme is formed, and fracturing optimization needs to take the yield improvement and the development benefit improvement into consideration⁴m³Thus, the fracturing reconstruction is cost-effective.

Accordingly, numerical simulation is used to determine the fracturing mode and fracturing parameters of the W1 horizontal well, as shown in FIG. 9. if only effective sand bodies of the reservoir are fractured (i.e. fracturing fractures numbered 2, 3, 4 and 7), the yield 5057 × 10⁴m³If not only the effective reservoir sand (i.e. fracture numbers 2, 3, 4 and 7) but also some reservoir sand (i.e. fracture numbers 1, 5 and 8) are fractured, the mass production 5986 × 10⁴m³6024 × 10 Mass production of effective sand from fractured reservoirs (i.e. fracture numbers 2, 3, 4 and 7) and total sand from fractured reservoirs (i.e. fracture numbers 1, 5, 6 and 8)⁴m³It can be seen that the gas production increases for crack 1, crack 5, crack 6 and crack 8 are 222 × 10 respectively⁴m³、367×10⁴m³、38×10⁴m³And 340 × 10⁴m³The gas production rate increased by the crack 1, the crack 5 and the crack 8 exceeds 200 × 10⁴m³While the increased gas production of the crack 6 is only 38 × 10⁴m³According to whether the increased gas production reaches 200 × 10⁴m³The constraint conditions of (1) and (8) are determined from the economic aspect, aiming at a W1 horizontal well, the fractured geologic pattern is determined to be a local concentrated type fractured geologic pattern, and 7 sections of effective sand bodies of a fractured reservoir (namely the fractured fractures are numbered as 2, 3, 4 and 7) and 3 sections of sand bodies of the fractured reservoir (namely the fractured fractures are numbered as 1, 5 and 8) are fractured in the W1 horizontal well.

In summary, the embodiment of the present invention determines the stacking pattern of the effective sand bodies according to the vertical profile of the reservoir in the target region; determining a correlation coefficient of the geological parameter and the production index parameter by utilizing linear regression, and determining the geological parameter of which the correlation coefficient is greater than a preset correlation coefficient as a key geological parameter; the production index parameters at least comprise single well dynamic reserves; determining a fracturing geological mode of each horizontal well in a reservoir stratum of a target area according to the overlapping pattern of the effective sand bodies, the production index parameters and the key geological parameters; and determining fracturing parameters corresponding to the fracturing geological mode of each horizontal well by utilizing numerical simulation, and fracturing the reservoir in the target area according to the fracturing parameters. According to the embodiment of the invention, the key geological parameters are determined by linear regression, the single-well dynamic reserve is adopted to represent the production index parameters, and finally the fracturing parameters of each horizontal well are determined by numerical simulation, so that the defect of determining the fracturing parameters by depending on experience is overcome, and the reservoir fracturing effect is improved.

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

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. A method of fracturing a reservoir, comprising:

2. The method of claim 1, wherein the overlay pattern comprises one or more of:

the fractured geologic pattern includes one or more of:

3. The method of claim 2, wherein the geological parameters include one or more of:

the length of a reservoir sand body, the length of a reservoir effective sand body, the thickness of the reservoir effective sand body, the drilling rate of the reservoir and the development interval of a choking zone;

4. The method of claim 3, wherein when the stacking pattern is a massive thick-bed stacking pattern, the fractured geological pattern is a massive thick-bed fractured geological pattern, and the geological parameters satisfy the following conditions:

5. The method of claim 4, wherein when the stacking pattern is a multi-phase stacking type stacking pattern, the fractured geological pattern is a multi-phase stacking type fractured geological pattern, and the geological parameters satisfy the following conditions:

6. The method of claim 5, wherein when the overlay pattern is a locally concentrated overlay pattern, the fractured geological pattern is a locally concentrated fractured geological pattern, and the geological parameters satisfy the following conditions:

7. The method of claim 6, wherein when the stacking pattern is a dispersed orphan stacking pattern, the fractured geologic pattern is a dispersed orphan fractured geologic pattern, and the geologic parameters satisfy the following conditions:

8. The method of claim 2, wherein the production index parameters further comprise one or more of:

unobstructed flow, initial production and predicted final recoverable yield.

9. The method of claim 8, wherein when the stacking pattern is a massive thick-bed stacking pattern, the fractured geologic pattern is a massive thick-bed fractured geologic pattern, and the production index parameter satisfies the following condition:

The initial yield is not less than a first preset initial yield; and/or

10. The method of claim 9, wherein when the stacking pattern is a multi-phase stacking type stacking pattern, the fractured geologic pattern is a multi-phase stacking type fractured geologic pattern, and the production indicator parameter satisfies the following condition:

11. The method of claim 10, wherein when the overlay pattern is a locally concentrated overlay pattern, the fractured geologic pattern is a locally concentrated fractured geologic pattern, and the production index parameter satisfies the following condition:

12. The method of claim 11, wherein when the stacking pattern is a dispersed stand-alone stacking pattern, the fractured geologic pattern is a dispersed stand-alone fractured geologic pattern, and the production indicator parameter satisfies the following condition:

The unimpeded flow is smaller than a third preset unimpeded flow; and/or

The initial yield is less than a third preset initial yield; and/or

13. The method of claim 1, wherein determining fracturing parameters corresponding to the fractured geological pattern of each horizontal well using numerical simulation, fracturing the reservoir of the target zone according to the fracturing parameters comprises:

determining constraint conditions of the fracturing parameters;

and determining the fracturing parameters of each horizontal well by using numerical simulation according to the constraint conditions of the fracturing parameters, and fracturing the reservoir in the target area according to the fracturing parameters.

14. The method of claim 1, wherein the constraints for the fracture parameters are determined by the following formula:

ΔG×M＞C；

15. A reservoir fracturing apparatus, comprising:

16. The apparatus of claim 15, wherein the fracture parameter determination module comprises:

the constraint condition determining unit is used for determining constraint conditions of the fracturing parameters;

and the fracturing parameter determining unit is used for determining the fracturing parameters of each horizontal well by using numerical simulation according to the constraint conditions of the fracturing parameters and fracturing the reservoir in the target area according to the fracturing parameters.

17. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the method of any one of claims 1 to 14 when executing the computer program.

18. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program for executing the method of any one of claims 1 to 14.