CN115828651B - Method, system, equipment and medium for determining reasonable diversion capability of hydraulic fracturing fracture - Google Patents
Method, system, equipment and medium for determining reasonable diversion capability of hydraulic fracturing fracture Download PDFInfo
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Abstract
The invention discloses a method, a system, equipment and a medium for determining reasonable diversion capacity of hydraulic fracturing cracks, and relates to the technical field of unconventional oil and gas reservoir development; randomly sampling the value range of the key factors to obtain a plurality of sampling values corresponding to each key factor; combining a plurality of sampling values corresponding to different key factors to obtain a plurality of sampling value combinations, and correspondingly modifying parameters in the single-well numerical simulation model according to each sampling value combination to form a basic numerical simulation model under different sampling value combinations; and changing the value of the crack flow conductivity, and calculating the reasonable crack flow conductivity of each basic numerical simulation model, so as to determine the corresponding reasonable crack flow conductivity of the target block under different sampling value combinations. The method can quickly determine the reasonable fracture conductivity of the target fracturing well without repeated experiments or simulation optimization.
Description
Technical Field
The invention relates to the technical field of unconventional oil and gas reservoir development, in particular to a method, a system, electronic equipment and a storage medium for determining reasonable diversion capacity of hydraulic fracturing cracks.
Background
The efficient development of unconventional oil and gas reservoirs such as compact oil, shale oil and the like is an important support for guaranteeing the balance of oil and gas resource supply and demand. The hydraulic fracturing technology is a key technical means for improving the development effect of unconventional oil and gas reservoirs, wherein the reasonable flow conductivity of cracks in the hydraulic fracturing process is determined, and the economic and effective development of unconventional oil and gas reservoirs is realized. When the fracture conductivity is low, oil gas generated in the reservoir is difficult to flow into the well through the fracture in time, so that the oil well yield is low; the higher the fracture conductivity, the more propping agent needs to be added during fracturing, thereby causing high fracturing cost, so that the reasonable fracture conductivity needs to be determined for the hydraulic fracturing well to realize the economic and efficient development of unconventional oil and gas reservoirs.
The reasonable fracture conductivity required under different geological and development conditions is different, so that the reasonable fracture conductivity needs to be determined for target wells under different conditions respectively. The existing fracture conductivity determination method mainly aims at different hydraulic fracture wells, takes fracture conductivity as an optimization variable, and optimizes by taking target well yield or economic indexes as a target function. However, the hydraulic fracturing well under different geology and different development conditions needs to be optimized again, and particularly, the corresponding objective function value needs to be obtained through numerical simulation for each fracture conductivity, so that each optimization needs a long time, and the rapid and efficient fracturing scheme design aiming at the objective well on site is not facilitated. Therefore, a more efficient and visual method for determining reasonable flow conductivity of hydraulic fracturing cracks needs to be provided.
Disclosure of Invention
In view of the above, the invention aims to provide a method, a system, equipment and a medium for determining reasonable flow conductivity of hydraulic fracture.
In order to achieve the above object, the present invention provides the following.
In a first aspect, the invention provides a method for determining reasonable diversion capability of a hydraulic fracture, comprising the following steps: obtaining geological and engineering parameters of a target block, and determining key factors influencing reasonable crack flow conductivity of the target block; if the target well type in the target block is a vertical well, the key factors are fracture half length, reservoir permeability and viscosity; if the target well in the target block is a horizontal well, the key factors are fracture spacing, fracture half length, reservoir permeability and viscosity; constructing a single-well numerical simulation model of the target block according to the geological and engineering parameters and the key factors; determining the value range of each key factor, and randomly sampling the value range of each key factor to obtain a plurality of sampling values corresponding to each key factor; combining a plurality of sampling values corresponding to different key factors to obtain a plurality of sampling value combinations, and correspondingly modifying parameters in the single-well numerical simulation model according to each sampling value combination to form a basic numerical simulation model under different sampling value combinations; the basic numerical simulation model is a model obtained by modifying parameters in the single-well numerical simulation model by adopting a sampling value combination; executing a first operation on each basic numerical simulation model to obtain reasonable crack flow conductivity corresponding to each basic numerical simulation model; determining the reasonable crack flow conductivity corresponding to the target block under different sampling value combinations according to the reasonable crack flow conductivity corresponding to each basic numerical simulation model; wherein the first operation includes the steps of: determining a fracture conductivity value range, and randomly sampling the fracture conductivity value range to obtain a plurality of fracture conductivity values; sequencing a plurality of crack diversion capacity values from small to large, sequentially calculating yield increase change values corresponding to the crack diversion capacity values according to the sequencing sequence of the crack diversion capacity values, stopping calculation when the yield increase change values are smaller than a set threshold value, and then determining the crack diversion capacity values corresponding to the yield increase change values smaller than the set threshold value as reasonable crack diversion capacity required by a basic numerical simulation model; the increased yield change value is a difference value between the first production dynamic value and the second production dynamic value; the first production dynamic value is obtained by carrying out numerical simulation on the basic numerical simulation model according to a first crack flow conductivity value, and the second production dynamic value is obtained by carrying out numerical simulation on the basic numerical simulation model according to a second crack flow conductivity value; in the order of the fracture conductivity values, the first fracture conductivity value is located after the second fracture conductivity value.
In a second aspect, the present invention provides a hydraulic fracture reasonable conductivity determination system comprising: the parameter acquisition module is used for acquiring geological and engineering parameters of the target block and determining key factors affecting reasonable crack flow conductivity of the target block; if the target well type in the target block is a vertical well, the key factors are fracture half length, reservoir permeability and viscosity; if the target well in the target block is a horizontal well, the key factors are fracture spacing, fracture half length, reservoir permeability and viscosity; the single-well numerical simulation model construction module is used for constructing a single-well numerical simulation model of the target block according to the geological and engineering parameters and the key factors; the sampling value calculation module is used for determining the value range of each key factor, and randomly sampling the value range of each key factor to obtain a plurality of sampling values corresponding to each key factor; the basic numerical simulation model determining module is used for combining a plurality of sampling values corresponding to different key factors to obtain a plurality of sampling value combinations, and correspondingly modifying parameters in the single-well numerical simulation model according to each sampling value combination to form a basic numerical simulation model under different sampling value combinations; the basic numerical simulation model is a model obtained by modifying parameters in the single-well numerical simulation model by adopting a sampling value combination; the model reasonable crack flow conductivity calculation module is used for executing first operation on each basic numerical simulation model to obtain reasonable crack flow conductivity corresponding to each basic numerical simulation model; the target area reasonable crack flow conductivity calculation module is used for determining the reasonable crack flow conductivity corresponding to the target block under different sampling value combinations according to the reasonable crack flow conductivity corresponding to each basic numerical simulation model; wherein the first operation includes the steps of: determining a fracture conductivity value range, and randomly sampling the fracture conductivity value range to obtain a plurality of fracture conductivity values; sequencing a plurality of crack diversion capacity values from small to large, sequentially calculating yield increase change values corresponding to the crack diversion capacity values according to the sequencing sequence of the crack diversion capacity values, stopping calculation when the yield increase change values are smaller than a set threshold value, and then determining the crack diversion capacity values corresponding to the yield increase change values smaller than the set threshold value as reasonable crack diversion capacity required by a basic numerical simulation model; the increased yield change value is a difference value between the first production dynamic value and the second production dynamic value; the first production dynamic value is obtained by carrying out numerical simulation on the basic numerical simulation model according to a first crack flow conductivity value, and the second production dynamic value is obtained by carrying out numerical simulation on the basic numerical simulation model according to a second crack flow conductivity value; in the order of the fracture conductivity values, the first fracture conductivity value is located after the second fracture conductivity value.
In a third aspect, the present invention provides an electronic device comprising a memory for storing a computer program and a processor that runs the computer program to cause the electronic device to perform a method for determining the reasonable conductivity of a hydraulic fracture according to the first aspect.
In a fourth aspect, the present invention provides a computer readable storage medium storing a computer program which when executed by a processor implements a hydraulic fracture reasonable conductivity determination method according to the first aspect.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
compared with the prior art, the method establishes the reasonable fracture conductivity determination plate of the hydraulic fracturing fracture with different reservoir types and different well types through multiple numerical simulations, and can rapidly determine the reasonable fracture conductivity required by the target fracturing well by using the established plate without repeated experiments or simulation optimization, thereby greatly saving calculation resources and calculation time and improving the design efficiency of the fracturing scheme. Meanwhile, the established plate can more intuitively display the influence of different factors on the diversion capacity of the composite cracks, and is convenient for production development decision and optimization.
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 needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of a method for determining the reasonable conductivity of a hydraulic fracture.
FIG. 2 is a graph showing the variation of cumulative oil production with fracture conductivity according to the present invention.
FIG. 3 is a graph of the flow conductivity increase per fracture yield change of the present invention.
FIG. 4 is a graph showing the change of the flow conductivity of a reasonable fracture under the conditions of different production stages of the low permeability reservoir vertical well of the present invention.
FIG. 5 is a graph showing the change of the reasonable fracture conductivity of a low permeability reservoir vertical well under different fracture half lengths.
FIG. 6 is a graph of the change in the conductivity of a reasonable fracture under different permeability conditions for a low permeability reservoir vertical well according to the present invention.
FIG. 7 is a schematic diagram of a graph of fracture conductivity at a stage of decreasing a vertical well in a different type of reservoir according to the present invention.
FIG. 8 is a schematic diagram of a graph of fracture conductivity maps at a steady production stage of a vertical well of different types of reservoirs according to the present invention.
FIG. 9 is a schematic diagram of a graph of fracture conductivity at the stage of the horizontal well depletion for different types of reservoirs according to the present invention.
FIG. 10 is a schematic diagram of a graph of fracture conductivity maps at a steady production stage of a horizontal well for different types of reservoirs in accordance with the present invention.
Fig. 11 is a schematic structural diagram of a hydraulic fracture reasonable conductivity determination system according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. 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.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Example 1
As shown in fig. 1, the embodiment of the invention provides a method for determining reasonable diversion capability of a hydraulic fracture, which specifically comprises the following steps of.
Step 100: obtaining geological and engineering parameters of a target block, and determining key factors influencing reasonable crack flow conductivity of the target block; if the target well type in the target block is a vertical well, the key factors are fracture half length, reservoir permeability and viscosity; if the target well type in the target zone is a horizontal well, the key factors are fracture spacing, fracture half length, reservoir permeability and viscosity.
Step 200: and constructing a single-well numerical simulation model of the target block according to the geological and engineering parameters and the key factors.
Step 300: and determining the value range of each key factor, and randomly sampling the value range of each key factor to obtain a plurality of sampling values corresponding to each key factor.
For example: and equally dividing each key factor in the value range to obtain a preset value (or sampling value) of each key factor.
Step 400: combining a plurality of sampling values corresponding to different key factors to obtain a plurality of sampling value combinations, and correspondingly modifying parameters in the single-well numerical simulation model according to each sampling value combination to form a basic numerical simulation model under different sampling value combinations; the basic numerical simulation model is a model obtained by modifying parameters in the single-well numerical simulation model by adopting a sampling value combination.
Step 500: and executing a first operation on each basic numerical simulation model to obtain reasonable crack flow conductivity corresponding to each basic numerical simulation model.
Wherein the first operation includes the following steps.
Determining a fracture conductivity value range, and randomly sampling the fracture conductivity value range to obtain a plurality of fracture conductivity values; for example: and setting different crack flow conductivity values which are increased from small to large at equal intervals in sequence according to the range of the crack flow conductivity values.
Sequencing a plurality of crack diversion capacity values from small to large, sequentially calculating yield increase change values corresponding to the crack diversion capacity values according to the sequencing sequence of the crack diversion capacity values, stopping calculation when the yield increase change values are smaller than a set threshold value, and then determining the crack diversion capacity values corresponding to the yield increase change values smaller than the set threshold value as reasonable crack diversion capacity required by a basic numerical simulation model; the increased yield change value is a difference value between the first production dynamic value and the second production dynamic value; the first production dynamic value is obtained by carrying out numerical simulation on the basic numerical simulation model according to a first crack flow conductivity value, and the second production dynamic value is obtained by carrying out numerical simulation on the basic numerical simulation model according to a second crack flow conductivity value; in the order of the fracture conductivity values, the first fracture conductivity value is located after the second fracture conductivity value.
For example: firstly, obtaining production dynamic values of a basic numerical simulation model under different fracture conductivity values; then, according to the production dynamic values of the basic numerical simulation model under different fracture conductivity values, drawing a unit fracture conductivity increase output change curve corresponding to the single well numerical simulation model under different sampling value combinations; and then determining reasonable fracture conductivity corresponding to the basic numerical simulation model under different sampling value combinations according to the yield increasing change curve of the unit fracture conductivity.
In the embodiment of the invention, the production dynamic value is one or a combination of more of daily oil production, accumulated oil production and the like.
Step 600: according to the reasonable crack flow conductivity corresponding to each basic numerical simulation model, determining the reasonable crack flow conductivity corresponding to the target block under different sampling value combinations, wherein the reasonable crack flow conductivity comprises the following specific steps:
when the target well type in the target block is a vertical well or a horizontal well, drawing a reasonable fracture conductivity chart of the target well type under different sampling value combinations according to the reasonable fracture conductivity corresponding to each basic numerical simulation model; and then determining the reasonable fracture conductivity of the target block corresponding to different sampling value combinations according to the reasonable fracture conductivity plate.
When the target well type in the target block is a horizontal well, determining a reasonable fracture conductivity calculation formula of the target well type under different sampling value combinations according to the reasonable fracture conductivity corresponding to each basic numerical simulation model; and then determining the reasonable fracture conductivity of the target block corresponding to different sampling value combinations according to the reasonable fracture conductivity calculation formula.
Taking a certain tight oil reservoir as an example, based on geology and engineering conditions under different reservoir types, respectively establishing numerical simulation models of a vertical well and a horizontal well, performing simulation research on reasonable fracture conductivity required by the vertical well under different reservoir types in different production stages and the horizontal well under different fracture intervals in different production stages, and establishing a corresponding reasonable fracture conductivity chart.
1. And (3) simulating and researching reasonable flow conductivity of the cracks under the conditions of different production stages of the low-permeability reservoir vertical well and different crack intervals of the horizontal well.
1.1 And simulating and researching the change rule of the reasonable diversion capability of the accumulated oil yield and the cracks of the low-permeability reservoir.
And establishing a numerical simulation model aiming at the vertical well and the multistage fracturing horizontal well under the condition of the low permeability reservoir according to actual geological and physical parameters of a certain tight reservoir. The values of the numerical simulation basic parameters of the vertical well and the horizontal well under the condition of the low permeability reservoir corresponding to each numerical simulation model are shown in the following table.
Fracture conductivity is an important factor affecting the fracturing modification yield increasing effect. Crack conductivity C f Specifically defined as the average width w of the propping slits f And propping fracture permeability k f As shown in formula (1), the physical meaning of which is expressed in terms of the amount of liquid flow capacity provided by the propped fracture. The hydraulic fracturing aims to provide a high-conductivity channel directly connecting a stratum and a shaft, change the seepage mode of stratum fluid and furthest improve the Production Index (PI) of oil gas. Therefore, the quality of the fracture conductivity and the good matching of the fracture conductivity and the stratum seepage capability are all important factors influencing the fracturing transformation yield increasing effect.
The liquid flowing capability from the fracture transformation area to the shaft can be effectively improved by increasing the fracture diversion capability, but after the fracture diversion capability is increased to a certain degree, the fracture yield increasing effect is not further improved. This is because the hydraulic fracturing modification stimulation effect is affected by two factors, including the magnitude of the fluid supply capacity of the formation to the fracture and the magnitude of the fluid supply capacity of the fracture to the wellbore. Therefore, to better realize the good matching of the stratum fluid supply capacity and the fracture conductivity, the dimensionless fracture conductivity C is introduced fD The specific formula of which is shown below.
Wherein x is f For the fracture half length, k is the reservoir permeability.
The physical meaning of dimensionless fracture conductivity is the ratio of the ability of the fracture to supply fluid into the wellbore to the ability of the formation to supply fluid into the fracture. In the formula (2), the molecular part is fracture conductivity and is mainly represented by the liquid supply capability of the fracture to the well bore; the denominator part is the product of the half length of the fracture and the permeability of the reservoir, and is mainly represented by the liquid supply capability of the stratum into the fracture. Therefore, to achieve the most appropriate fracture modification yield increasing effect, reasonable fracture diversion capacity under different stratum and fracturing conditions must be determined, and good matching of the two-part liquid supply capacity is achieved.
Therefore, reasonable fracture conductivity under different stratum and fracture conditions is mainly influenced by the size of the liquid supply capacity of the stratum to the fracture, in a horizontal well, the size of the liquid supply capacity of the part can be embodied as the capacity of single fracture control, and under the condition of a certain fluid viscosity in a block, the liquid supply capacity is mainly influenced by factors such as half length of the fracture, reservoir conditions, fracture spacing and the like, therefore, in the embodiment, the half length of the fracture, the permeability of the reservoir and the fracture spacing are taken as main factors, the change rule of the reasonable fracture conductivity under different values of the three factors is studied, and then the reasonable fracture conductivity chart of the fracture under different conditions is drawn.
According to the three selected factors, each factor selects 5 different values according to actual production conditions, and the specific values are shown in table 2. Further researching reasonable flow conductivity of the crack under different parameter combinations by using a numerical simulation method, wherein the specific research steps are as follows.
(1) And setting a numerical model according to the values of the selected parameters of the vertical well and the horizontal well.
(2) Setting the fracture conductivity as a smaller value, and performing numerical simulation to obtain the cumulative oil yield data of 5 years under the current condition.
(3) The crack flow conductivity is increased at equal intervals, numerical simulation is repeatedly performed, cumulative oil production data are sequentially read, and when the crack flow conductivity is increased, but the increased cumulative oil production is smaller than a certain value, the increase effect caused by continuously increasing the crack flow conductivity is not large, so that the crack flow conductivity at the moment can be regarded as reasonable crack flow conductivity.
(4) And (3) changing the permeability of the reservoir, the interval between the cracks and the value of the half length of the cracks, and repeating the steps until all combinations of selected parameters in the following table are traversed. The names of the tables are reasonable fracture conductivity research selection parameters and corresponding value tables.
Aiming at different combination conditions of selected factors, the fracture conductivity is sequentially changed, and the change condition that the cumulative oil yield of the model increases along with the fracture conductivity is researched.
Taking a certain parameter combination as an example, the situation that the cumulative oil production changes along with the fracture conductivity is shown in fig. 2.
As can be seen from fig. 2, the cumulative oil yield increases rapidly and gradually with increasing fracture conductivity, because the storage capacity controlled by a single fracture is constant under the same reservoir conditions, fracture half-length and fracture spacing conditions, and the formation fluid supply capacity to the fracture is constant under the condition of low fracture conductivity, and the formation fluid supply capacity to the wellbore cannot be matched with the formation fluid supply capacity to the fracture, so that the cumulative oil yield increases rapidly with increasing fracture conductivity. However, when the flow conductivity of the cracks is increased to a certain extent, the liquid supply capacity of the cracks to the shaft is larger than the liquid supply capacity of the stratum to the cracks, and at the moment, the single crack control capacity cannot be continuously matched with the flow conductivity of the cracks, so that the accumulated oil yield increase speed is gradually slowed down. Meanwhile, the crack flow conductivity corresponding to the gradual stage entering under different conditions is different, which indicates that the reasonable crack flow conductivity required under different geological and development parameter combinations is different.
Specifically, the derivative of the curve of the cumulative oil yield along with the flow conductivity of the crack is taken as a judging sign of the reasonable flow conductivity of the crack, namely, the increment of the cumulative oil yield caused by increasing the flow conductivity of the unit crack is shown in fig. 3, the increment of the flow conductivity of the unit crack is obviously reduced along with the increment of the flow conductivity of the crack, the increment of the flow conductivity of the unit crack is gradually flattened after the increment of the flow conductivity of the unit crack is reduced to a certain degree, and a given value can be selected as a standard for judging the reasonable flow conductivity of the crack.
Further analyzing the change condition of the unit fracture flow conductivity yield increase under different conditions. In most cases, the increase in the per-fracture conductivity begins to flatten out as it decreases to about 2.5, so 2.5 can be chosen as a uniform criterion.
According to the steps, a plurality of groups of numerical simulation researches are carried out, and firstly, analysis and summary are carried out on the change rule of the accumulated oil yield along with the flow conductivity of the crack under different conditions, wherein the specific rule is as follows.
The change of reasonable fracture conductivity under the conditions of different production stages of the low permeability reservoir vertical well is shown in fig. 4. When the production time is increased, the stratum energy is gradually consumed, the stratum pressure is reduced, the liquid supply capacity of the stratum to the cracks is reduced, and the capacity of single crack control is smaller, so that the liquid supply capacity of the required cracks to the well bore is smaller, namely the reasonable diversion capacity of the cracks is smaller.
The change of reasonable fracture conductivity under different fracture half-length conditions of the low permeability reservoir vertical well is shown in fig. 5. When the fracture is increased by half length, the area of the liquid supply area of the stratum to the fracture is increased, namely the productivity controlled by the fracture is increased, and in order to meet the improvement of the liquid supply capacity caused by the increase of the liquid supply area, the fracture needs to provide stronger liquid supply capacity to the well bore, so that the reasonable diversion capacity of the fracture is larger.
The change of reasonable fracture conductivity under different permeability conditions of the low permeability reservoir vertical well is shown in fig. 6. As the permeability of the reservoir increases, the ability of the formation to supply fluid into the fracture increases, and the capacity of the fracture to control is greater, so that a stronger ability of the fracture to supply fluid into the wellbore, i.e., a greater ability of the fracture to reasonably conduct fluid, is required.
Furthermore, the same method is adopted to research the conditions of accumulated oil production and reasonable fracture conductivity change of the low-permeability reservoir horizontal well under the conditions of different production stages, different joint distances, different fracture half lengths and different reservoir permeability.
In summary, the reasonable diversion capability of the crack shows similar trend along with the change of different factors under different well types of the horizontal well and the vertical well. And according to the change of the reasonable fracture conductivity under the influence of different factors, a reasonable fracture conductivity drawing board can be statistically analyzed and drawn.
1.2 Low permeability reservoir fracture map fluid conductivity map rendering.
And according to the change rule of reasonable fracture conductivity of the horizontal well and the vertical well under the different types of reservoirs obtained through the statistical analysis under the influence of factors such as the reservoir permeability, the fracture conditions and the like, obtaining reasonable fracture conductivity patterns of the vertical well under the low permeability reservoir in different production stages and different production stages of different fracture pitches of the horizontal well through statistical drawing.
(1) Reasonable fracture conductivity plate for different production stages of low permeability reservoir vertical well.
Based on the change rule of the reasonable fracture conductivity of the vertical well under different conditions of the low-permeability reservoir, drawing to obtain the reasonable fracture conductivity plate under different production stages of the vertical well of the low-permeability reservoir, as shown in fig. 7 and 8.
(2) Reasonable fracture conductivity plate for different production stages of low permeability reservoir horizontal well.
Based on the change rule of the reasonable fracture conductivity of the horizontal well under different conditions of the low-permeability reservoir, drawing a reasonable fracture conductivity map version under different production stages of the horizontal well of the low-permeability reservoir, and fitting to obtain a calculation formula of the reasonable fracture conductivity of the horizontal well under the conditions of a decreasing stage and a stable production stage, wherein the calculation formula is specifically shown as formula (3) and formula (4); the reasonable fracture conductivity plates of the low-permeability reservoir horizontal well in different production stages are shown in fig. 9 and 10 respectively.
Wherein L represents a crack spacing.
Example two
In order to execute the corresponding method of the above embodiment to achieve the corresponding functions and technical effects, a hydraulic fracture reasonable conductivity determination system is provided below.
As shown in fig. 11, the system for determining the reasonable diversion capability of the hydraulic fracture provided by the embodiment of the invention comprises the following modules.
The parameter acquisition module 1 is used for acquiring geological and engineering parameters of a target block and determining key factors influencing reasonable crack flow conductivity of the target block; if the target well type in the target block is a vertical well, the key factors are fracture half length, reservoir permeability and viscosity; if the target well type in the target zone is a horizontal well, the key factors are fracture spacing, fracture half length, reservoir permeability and viscosity.
And the single-well numerical simulation model construction module 2 is used for constructing a single-well numerical simulation model of the target block according to the geological and engineering parameters and the key factors.
And the sampling value calculating module 3 is used for determining the value range of each key factor, and randomly sampling the value range of each key factor to obtain a plurality of sampling values corresponding to each key factor.
The basic numerical simulation model determining module 4 is used for combining a plurality of sampling values corresponding to different key factors to obtain a plurality of sampling value combinations, and correspondingly modifying parameters in the single-well numerical simulation model according to each sampling value combination to form a basic numerical simulation model under different sampling value combinations; the basic numerical simulation model is a model obtained by modifying parameters in the single-well numerical simulation model by adopting a sampling value combination.
And the model reasonable fracture conductivity calculation module 5 is used for executing a first operation on each basic numerical simulation model to obtain the reasonable fracture conductivity corresponding to each basic numerical simulation model.
And the target area reasonable crack flow conductivity calculation module 6 is used for determining the reasonable crack flow conductivity corresponding to the target block under different sampling value combinations according to the reasonable crack flow conductivity corresponding to each basic numerical simulation model.
Wherein the first operation includes the following steps.
And determining the fracture conductivity value range, and randomly sampling the fracture conductivity value range to obtain a plurality of fracture conductivity values.
Sequencing a plurality of crack diversion capacity values from small to large, sequentially calculating yield increase change values corresponding to the crack diversion capacity values according to the sequencing sequence of the crack diversion capacity values, stopping calculation when the yield increase change values are smaller than a set threshold value, and then determining the crack diversion capacity values corresponding to the yield increase change values smaller than the set threshold value as reasonable crack diversion capacity required by a basic numerical simulation model; the increased yield change value is a difference value between the first production dynamic value and the second production dynamic value; the first production dynamic value is obtained by carrying out numerical simulation on the basic numerical simulation model according to a first crack flow conductivity value, and the second production dynamic value is obtained by carrying out numerical simulation on the basic numerical simulation model according to a second crack flow conductivity value; in the order of the fracture conductivity values, the first fracture conductivity value is located after the second fracture conductivity value.
Example III
The embodiment of the invention provides electronic equipment which comprises a memory and a processor, wherein the memory is used for storing a computer program, and the processor runs the computer program to enable the electronic equipment to execute the hydraulic fracture reasonable flow conductivity determining method.
Alternatively, the electronic device may be a server.
In addition, the embodiment of the invention also provides a computer readable storage medium, which stores a computer program, and the computer program realizes the method for determining the reasonable flow conductivity of the hydraulic fracture according to the embodiment.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the system disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present invention and the core ideas thereof; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (4)
1. A method for determining reasonable diversion capacity of hydraulic fracturing cracks is characterized by comprising the following steps:
obtaining geological and engineering parameters of a target block, and determining key factors influencing reasonable crack flow conductivity of the target block; if the target well type in the target block is a vertical well, the key factors are fracture half length, reservoir permeability and viscosity; if the target well in the target block is a horizontal well, the key factors are fracture spacing, fracture half length, reservoir permeability and viscosity;
constructing a single-well numerical simulation model of the target block according to the geological and engineering parameters and the key factors;
determining the value range of each key factor, and randomly sampling the value range of each key factor to obtain a plurality of sampling values corresponding to each key factor;
combining a plurality of sampling values corresponding to different key factors to obtain a plurality of sampling value combinations, and correspondingly modifying parameters in the single-well numerical simulation model according to each sampling value combination to form a basic numerical simulation model under different sampling value combinations; the basic numerical simulation model is a model obtained by modifying parameters in the single-well numerical simulation model by adopting a sampling value combination;
executing a first operation on each basic numerical simulation model to obtain reasonable crack flow conductivity corresponding to each basic numerical simulation model;
determining the reasonable crack flow conductivity corresponding to the target block under different sampling value combinations according to the reasonable crack flow conductivity corresponding to each basic numerical simulation model;
wherein the first operation includes the steps of:
determining a fracture conductivity value range, and randomly sampling the fracture conductivity value range to obtain a plurality of fracture conductivity values;
sequencing a plurality of crack diversion capacity values from small to large, sequentially calculating yield increase change values corresponding to the crack diversion capacity values according to the sequencing sequence of the crack diversion capacity values, stopping calculation when the yield increase change values are smaller than a set threshold value, and then determining the crack diversion capacity values corresponding to the yield increase change values smaller than the set threshold value as reasonable crack diversion capacity required by a basic numerical simulation model; the increased yield change value is a difference value between the first production dynamic value and the second production dynamic value; the first production dynamic value is obtained by carrying out numerical simulation on the basic numerical simulation model according to a first crack flow conductivity value, and the second production dynamic value is obtained by carrying out numerical simulation on the basic numerical simulation model according to a second crack flow conductivity value; in the sorting order of the fracture conductivity values, the first fracture conductivity value is located after the second fracture conductivity value;
and determining the reasonable crack flow conductivity of the target block corresponding to different sampling value combinations according to the reasonable crack flow conductivity corresponding to each basic numerical simulation model, wherein the method specifically comprises the following steps of: when the target well type in the target block is a vertical well or a horizontal well, drawing a reasonable fracture conductivity chart of the target well type under different sampling value combinations according to the reasonable fracture conductivity corresponding to each basic numerical simulation model; determining the reasonable fracture conductivity of the target block corresponding to different sampling value combinations according to the reasonable fracture conductivity plate;
or determining the reasonable crack flow conductivity of the target block under different sampling value combinations according to the reasonable crack flow conductivity corresponding to each basic numerical simulation model, which specifically comprises the following steps: when the target well type in the target block is a horizontal well, determining a reasonable fracture conductivity calculation formula of the target well type under different sampling value combinations according to the reasonable fracture conductivity corresponding to each basic numerical simulation model; and determining the reasonable fracture conductivity of the target block corresponding to different sampling value combinations according to the reasonable fracture conductivity calculation formula.
2. A hydraulic fracture reasonable conductivity determination system, comprising:
the parameter acquisition module is used for acquiring geological and engineering parameters of the target block and determining key factors affecting reasonable crack flow conductivity of the target block; if the target well type in the target block is a vertical well, the key factors are fracture half length, reservoir permeability and viscosity; if the target well in the target block is a horizontal well, the key factors are fracture spacing, fracture half length, reservoir permeability and viscosity;
the single-well numerical simulation model construction module is used for constructing a single-well numerical simulation model of the target block according to the geological and engineering parameters and the key factors;
the sampling value calculation module is used for determining the value range of each key factor, and randomly sampling the value range of each key factor to obtain a plurality of sampling values corresponding to each key factor;
the basic numerical simulation model determining module is used for combining a plurality of sampling values corresponding to different key factors to obtain a plurality of sampling value combinations, and correspondingly modifying parameters in the single-well numerical simulation model according to each sampling value combination to form a basic numerical simulation model under different sampling value combinations; the basic numerical simulation model is a model obtained by modifying parameters in the single-well numerical simulation model by adopting a sampling value combination;
the model reasonable crack flow conductivity calculation module is used for executing first operation on each basic numerical simulation model to obtain reasonable crack flow conductivity corresponding to each basic numerical simulation model;
the target area reasonable crack flow conductivity calculation module is used for determining the reasonable crack flow conductivity corresponding to the target block under different sampling value combinations according to the reasonable crack flow conductivity corresponding to each basic numerical simulation model;
wherein the first operation includes the steps of:
determining a fracture conductivity value range, and randomly sampling the fracture conductivity value range to obtain a plurality of fracture conductivity values;
sequencing a plurality of crack diversion capacity values from small to large, sequentially calculating yield increase change values corresponding to the crack diversion capacity values according to the sequencing sequence of the crack diversion capacity values, stopping calculation when the yield increase change values are smaller than a set threshold value, and then determining the crack diversion capacity values corresponding to the yield increase change values smaller than the set threshold value as reasonable crack diversion capacity required by a basic numerical simulation model; the increased yield change value is a difference value between the first production dynamic value and the second production dynamic value; the first production dynamic value is obtained by carrying out numerical simulation on the basic numerical simulation model according to a first crack flow conductivity value, and the second production dynamic value is obtained by carrying out numerical simulation on the basic numerical simulation model according to a second crack flow conductivity value; in the sorting order of the fracture conductivity values, the first fracture conductivity value is located after the second fracture conductivity value;
and determining the reasonable crack flow conductivity of the target block corresponding to different sampling value combinations according to the reasonable crack flow conductivity corresponding to each basic numerical simulation model, wherein the method specifically comprises the following steps of: when the target well type in the target block is a vertical well or a horizontal well, drawing a reasonable fracture conductivity chart of the target well type under different sampling value combinations according to the reasonable fracture conductivity corresponding to each basic numerical simulation model; determining the reasonable fracture conductivity of the target block corresponding to different sampling value combinations according to the reasonable fracture conductivity plate;
or determining the reasonable crack flow conductivity of the target block under different sampling value combinations according to the reasonable crack flow conductivity corresponding to each basic numerical simulation model, which specifically comprises the following steps: when the target well type in the target block is a horizontal well, determining a reasonable fracture conductivity calculation formula of the target well type under different sampling value combinations according to the reasonable fracture conductivity corresponding to each basic numerical simulation model; and determining the reasonable fracture conductivity of the target block corresponding to different sampling value combinations according to the reasonable fracture conductivity calculation formula.
3. An electronic device comprising a memory for storing a computer program and a processor that runs the computer program to cause the electronic device to perform a method of determining the proper conductivity of a hydraulic fracture according to claim 1.
4. A computer readable storage medium, characterized in that it stores a computer program which, when executed by a processor, implements a hydraulic fracture reasonable conductivity determination method according to claim 1.
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| CN111814318A (en) * | 2020-06-22 | 2020-10-23 | 中国石油大学(华东) | Staged fracturing fracture parameter design method for tight reservoir horizontal well |
| CN113821953A (en) * | 2021-09-22 | 2021-12-21 | 中国石油大学(华东) | Temporary plugging repeated fracturing design method based on dynamic ground stress and residual oil characteristics |
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| CN109408855B (en) * | 2018-09-03 | 2023-05-09 | 中国石油大学(华东) | Method and device for calculating fracture conductivity value of horizontal well to be fractured |
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| CN113821953A (en) * | 2021-09-22 | 2021-12-21 | 中国石油大学(华东) | Temporary plugging repeated fracturing design method based on dynamic ground stress and residual oil characteristics |
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