A fracturing parameter design method based on river channel distribution and river channel construction method

Abstract

The present invention discloses a method for designing fracturing parameters based on river channel distribution and a method for river channel construction in tight gas development. The method for designing fracturing parameters based on river channel distribution includes: setting a high permeability zone containing hydraulic fractures; implanting the high permeability zone into a reservoir numerical model; inputting various parameters into the reservoir numerical model for simulation to obtain simulation results; screening according to the hydraulic fracture parameters in the simulation results to obtain preferred hydraulic fracture parameters; comparing the preferred hydraulic fracture parameters corresponding to different river channel width parameters through pressure simulation software to obtain a combination of river channel width and fracturing parameters. This method can realize a differentiated design of one section and one parameter, providing a basis for later effect evaluation and reservoir optimization. At the same time, it can also avoid the problem of excessive transformation of poor reservoir sections and insufficient transformation of high-quality reservoir sections, ensuring that the reservoir is fully utilized according to the river channel distribution, greatly improving the economic benefits and the cumulative production of a single well.

Description

Technical Field

[0001] The present invention relates to the development of tight gas, and in particular to a method for designing fracturing parameters based on river channel distribution, and also to a method for river channel construction in the development of tight gas. Background Art

[0002] my country's tight gas development began in the 1970s, with a favorable exploration area of ​​320,000 square kilometers and geological resources of 17.45 to 25.1 trillion cubic meters, mainly distributed in seven major basins, including Ordos, Sichuan and Songliao. Academician Qiu Zhongjian pointed out in 2012 that the country's tight gas resources are about 20 trillion cubic meters, and technically recoverable resources are about 10 trillion cubic meters, showing huge development potential.

[0003] Reservoir porosity, permeability, pressure coefficient and other geological parameters as well as sand addition intensity, sand-liquid ratio, displacement and other engineering parameters will affect the post-pressurization effect and post-pressurization production. Here we define a tight sandstone energy storage coefficient C 储 , C 储 =C = river channel width × reservoir length × porosity × gas saturation, C 储 Reflects the volume of gas in tight sandstone. 储 It can be seen from the single-stage gas production contribution diagram that ( Figure 1 ), C 储 It has a good correlation with the cumulative output. Due to the strong heterogeneity of dense sandstone, its production capacity is also affected by factors such as pressure coefficient and natural fractures.

[0004] At the same time, according to the tracer test of each section of the single well, the tight sandstone wells Q1 and Q2 were compared. 储 Relationship with each section's gas production contribution (see Figure 2 , Figure 3 ), C 储 It is more correlated with the gas production contribution of each section.

[0005] Since the tight sandstones are all river channel sandstone deposits, the natural gas is stored along the river channel. Figure 4 It can be seen that the distribution of the river channels varies greatly, and the width of the river channels varies from 980m to 1500m. 储 Relative to the contribution of each section to gas production, for a single well, due to the relatively uniform changes in its geological parameters, C 储 The essence of the river is the change in the width of the river. That is, the production capacity of the wider river is greater, and the production capacity of the narrower river is less.

[0006] As tight development is still in its early stages, the fracturing parameters have not yet been optimized for different channel widths, and most individual wells use uniform parameters. As a result, it is possible that in the narrower channel section, the artificial fractures are too long and extend to the end of the channel, causing excessive transformation, while in the wider channel section, the artificial fractures are shorter, limiting the degree of reservoir utilization and affecting the production of individual wells. Summary of the invention

[0007] The purpose of the present invention is to provide a method for designing fracturing parameters based on river channel distribution, combining the change of river channel distribution, and designing more precise and economical fracturing parameters according to the change of river channel width in each transformation section to increase the single well production. The present invention also provides a method for river channel construction in tight gas development, using more precise and economical fracturing parameters to transform and construct the river channel to optimize the transformation method of the river channel.

[0008] In a first aspect of the present invention, the present invention adopts a method for designing fracturing parameters based on river channel distribution, comprising:

[0009] A river channel dimension model is established, and a set area containing hydraulic fractures is set as a high permeability zone; a set area containing hydraulic fractures is set as a high permeability zone in the equivalent seepage theory; the above-mentioned high permeability zone is implanted into the reservoir numerical model; the production corresponding to high permeability zones with different river width parameters and different permeability is input into the reservoir numerical model for simulation to obtain simulation results; the hydraulic fracture parameters in the simulation results are screened to obtain the preferred hydraulic fracture parameters; the above-mentioned preferred hydraulic fracture parameters corresponding to different river channel width parameters are compared through pressure simulation software to obtain a combination of river channel width and fracturing parameters.

[0010] By superimposing geological parameters and optimizing engineering parameters in the early stage of the experiment, the engineering and geological parameters are integrated to achieve differentiated design of parameters for each section, which provides a basis for later effect evaluation and reservoir optimization. At the same time, it can also avoid the problem of excessive transformation of poor reservoir sections and insufficient transformation of high-quality reservoir sections, ensure that the reservoir is fully utilized according to the river channel distribution, and greatly improve the economic benefits and cumulative production of single wells.

[0011] Furthermore, the fracturing parameter combination in the above-mentioned combination of river channel width and fracturing parameter includes: any one of sand addition intensity and fluid intensity or a combination of two thereof.

[0012] The relationship between sand addition intensity and river channel width is:

[0013] y1=(2.4~2.5)e 0.0005x

[0014] The relationship between liquid intensity and river width is:

[0015] y2=(7.2~7.5)e 0.0005x

[0016] y1 is the sand adding strength, unit is t / m;

[0017] y2 is the liquid strength, unit is m 3 / m;

[0018] x is the width of the river, in meters.

[0019] Furthermore, the relationship model between equivalent permeability and cumulative production of the reservoir numerical model under different channel widths is obtained;

[0020] Obtain the relationship model between sand volume and equivalent permeability of fractures;

[0021] According to the relationship model between equivalent permeability and cumulative production of the reservoir numerical model, different channel width models are established, according to the equivalent permeability in the relationship model between equivalent permeability and cumulative production of the reservoir numerical model;

[0022] According to the relationship model between sand volume and equivalent permeability of fractures, the sand adding intensity corresponding to the set section length is calculated, and the sand adding intensity parameters corresponding to different river channel widths are obtained.

[0023] Furthermore, a sand adding intensity curve diagram corresponding to different river channel widths is obtained according to the sand adding intensity parameters corresponding to different river channel widths, and a sand adding intensity relationship formula corresponding to different river channel widths is obtained.

[0024] Furthermore, according to the sand adding capacity of dense sandstone, the liquid-sand ratio under the maximum liquid control limit is obtained, and according to the sand adding intensity relationship corresponding to different channel widths, the liquid intensity relationship corresponding to different channel widths is obtained.

[0025] The above-mentioned sand-adding capacity of dense sandstone is determined by selecting the permeability of artificial fractures based on the optimal production capacity according to the geological models of different river channel widths, and then selecting the fracturing parameters based on the fracture conductivity and the fracturing software. The parameters include the sand-adding strength of dense sandstone, that is, the sand-adding capacity of dense sandstone.

[0026] In the second aspect of the present invention, the present invention provides a method for river channel construction in tight gas development, according to the first aspect and any one of its improved schemes, a combination of river channel width and fracturing parameters obtained in a method for designing fracturing parameters based on river channel distribution, and the river channel is constructed according to the combination of river channel width and fracturing parameters.

[0027] By adopting the method of river channel construction in tight gas development of the present application, different fracturing parameters are used according to different river channel widths instead of uniform parameters, which can greatly reduce the excessive transformation of the narrower river channel width and the limited reservoir utilization in the wider river channel width section, thereby greatly improving the single well production.

[0028] In a third aspect of the present invention, the present invention provides a method for constructing a river channel in tight gas development, comprising constructing the river channel according to a combination of river channel width and fracturing parameters, wherein the construction is performed according to the following parameters:

[0029] The relationship between sand addition intensity and river channel width is:

[0030] y1=(2.4~2.5)e 0.0005x

[0031] The relationship between liquid intensity and river width is:

[0032] y2=(7.2~7.5)e 0.0005x

[0033] y1 is the sand adding strength, unit is t / m;

[0034] y2 is the liquid strength, unit is m 3 / m;

[0035] x is the width of the river, in meters.

[0036] The method for constructing a river channel in tight gas development is adopted to realize refined fracturing design, and the river channel is transformed according to the parameters of the method, thereby avoiding the problems of excessive transformation of poor reservoir sections and insufficient transformation of high-quality reservoir sections, ensuring that the reservoir is fully utilized according to the river channel distribution, and greatly improving the economic benefits and the cumulative production of a single well.

[0037] Furthermore, the fracturing parameter combination in the above-mentioned combination of river channel width and fracturing parameter also includes: proppant dosage;

[0038] The proppant is a mixture of 70 / 140 mesh quartz sand and 40 / 70 mesh coated quartz sand, and the weight ratio of 70 / 140 mesh quartz sand to 40 / 70 mesh coated quartz sand is (7-8): (1-2).

[0039] The proppant here is 70 / 140 mesh quartz sand + 40 / 70 mesh coated quartz sand. The 70 / 140 mesh quartz sand is used to support micro cracks, and the 40 / 70 mesh coated quartz sand supports the main cracks to improve the flow conductivity. According to the implementation effect of the dense sandstone in the previous river channel, the 8:2 ratio can not only meet the sufficient flow conductivity, but also achieve a certain sand control and sand consolidation effect.

[0040] Furthermore, the amount of proppant to be used for different channel widths can be selected according to the following parameters.

[0041] The dosage of 70 / 140 mesh quartz sand is

[0042] y3=0.8*(2.4~2.5)e 0.0005x

[0043] y3 is the amount of 70 / 140 mesh quartz sand, in t / m;

[0044] x is the width of the river, in m;

[0045] The dosage of 40 / 70 mesh coated quartz sand is

[0046] y4=((1~2): (7~8))*0.8*(2.4~2.5)e 0.0005x

[0047] y4 is the amount of 40 / 70 mesh coated quartz sand, in t / m;

[0048] x is the width of the river, in meters.

[0049] Furthermore, the above-mentioned combination of river channel width and fracturing parameter also includes: displacement; the above-mentioned displacement is 17-20m 3 / min, or 18m 3 / min、19m 3 / min. The displacement parameter can be used to increase the length of the artificial cracks and ensure that each cluster of cracks is open, so the displacement is designed according to the above displacement parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings:

[0051] Figure 1 For explaining the background technology, C 储 Relationship diagram with single-stage gas production contribution;

[0052] Figure 2 For explaining the Q1 well C in the background technology 储 Relationship diagram with single-stage gas production contribution;

[0053] Figure 3 For explaining the Q2 well C in the background technology 储 Relationship diagram with single-stage gas production contribution;

[0054] Figure 4 It is used to illustrate the distribution diagram of river channel sand bodies in the background technology;

[0055] Figure 5 A flow chart for illustrating a method for designing fracturing parameters based on river channel layout in this embodiment;

[0056] Figure 6 A schematic diagram for illustrating multi-cluster fracturing of horizontal wells described in this embodiment;

[0057] Figure 7 The yield curves of different equivalent permeabilities of the Class I reservoir in Example 1;

[0058] Figure 8 is a graph showing the relationship between the amount of sand in a single stage and the fracture permeability in Example 1;

[0059] Fig. 9 The curve diagram of the relationship between the width of the river channel and the sand adding intensity made in Example 1;

[0060] Fig.10 The relationship curve diagram between the width of the river channel and the sand adding intensity in Example 3;

[0061] Fig.11 The relationship curve diagram between the width of the river channel and the sand adding intensity in Example 4;

[0062] Fig.12 This is a curve diagram showing the relationship between the width of the river channel and the intensity of sand addition made in Example 5. DETAILED DESCRIPTION

[0063] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0064] In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the present invention. However, it is apparent to one of ordinary skill in the art that these specific details are not necessarily employed to practice the present invention. In other instances, well-known structures, circuits, materials, or methods are not specifically described in order to avoid obscuring the present invention.

[0065] Throughout the specification, references to "one embodiment," "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment of the present invention. Therefore, the phrases "one embodiment," "an embodiment," "an example," or "an example" appearing in various places throughout the specification do not necessarily all refer to the same embodiment or example. In addition, particular features, structures, or characteristics may be combined in one or more embodiments or examples in any suitable combination and / or sub-combination. In addition, it will be appreciated by those of ordinary skill in the art that the figures provided herein are for illustrative purposes and that the figures are not necessarily drawn to scale. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0066] In the description of the present invention, it should be understood that the terms "front", "rear", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the scope of protection of the present invention.

[0067] like Figure 5 As shown, a method for designing fracturing parameters based on river channel distribution includes:

[0068] S1. Establish a river channel size model and set the set area containing hydraulic fractures as a high permeability zone;

[0069] S2. Obtaining a reservoir numerical model, inputting the production parameters corresponding to different river width parameters and high permeability zones with different permeability in the river channel size model into the reservoir numerical model for simulation to obtain simulation results;

[0070] S3. The simulation results are subjected to pressure simulation to compare the hydraulic fracture parameters corresponding to different channel width parameters, and the combination of channel width and fracturing parameters is obtained.

[0071] The setting of high permeability zone can be combined with Figure 6 , multi-cluster fracturing of horizontal wells, the high permeability zone in the figure includes the hydraulic fractures.

[0072] This method of designing fracturing parameters based on river channel distribution, through superimposing geological parameters and optimizing engineering parameters through preliminary tests, integrates engineering and geological parameters to achieve differentiated design of parameters for each section, and provides a basis for later effect evaluation and reservoir optimization. At the same time, it can also avoid the problem of excessive transformation of poor reservoir sections and insufficient transformation of high-quality reservoir sections, ensure that the reservoir is fully utilized according to the river channel distribution, and greatly improve the economic benefits and cumulative production of single wells.

[0073] Specifically, the fracturing parameter combination in the above-mentioned combination of river channel width and fracturing parameter includes: any one of sand addition intensity and fluid intensity or a combination of two of them.

[0074] Example 1

[0075] On the basis of the method for designing fracturing parameters based on river channel distribution in the above implementation mode, specifically, it includes: establishing a river channel size model, the model size is 6000*1500*20, the porosity is 13.2%, the permeability is 0.86mD, and the net-to-gross ratio is 0.8.

[0076] Obtain the relationship model between equivalent permeability and cumulative production of reservoir numerical model under different channel widths. Figure 7,According to the relationship diagram between equivalent permeability and production of ,the reservoir numerical model, when the equivalent permeability of ,Type I reservoir increases to 5-10mD, the cumulative production increases significantly, ,so this range is selected as the preferred equivalent permeability.

[0077] Obtain the relationship model between sand volume and fracture equivalent permeability, such as Figure 8 According to the relationship between fracture permeability and single-stage sand volume (segment length 100m), the single-stage sand volume of Class I reservoir is optimized to 500t (5t / m). During optimization, Meyer software can be used to simulate the permeability of artificial fractures with different sand volumes, and the required sand volume is optimized according to the permeability preferred by the geological model. Due to the previous reservoir numerical model, the river channel size is set to 6000*1500*20 in this embodiment, so the river channel width is 1500m and the sand intensity parameter is 5t / m, as shown in Table 1 below.

[0078] Table 1 Parameters of river channel tight sandstone geological model

[0079] Type I reservoir Remark Model size 6000*1500*20 Porosity(%) 13.2 Median reservoir porosity Permeability (mD) 0.86 Overburden permeability Net to Gross Ratio 0.8 Mesh Type Block Center Grid Grid step size (m) 25*25

[0080] According to the equivalent permeability and cumulative production relationship model of the reservoir numerical model, different river width models are established, according to the equivalent permeability in the reservoir numerical model and the cumulative production relationship model. According to the reservoir numerical equivalent permeability model, 300m, 500m, 1000m, 1500m, 2000m, 2500m simulation models of different river widths are established, and the Petrel software is used to simulate the geological model, and the river length, width, porosity, permeability, etc. are input. In this embodiment, 1500m is used for simulation, and the best equivalent permeability can be simulated. According to the preferred best equivalent permeability, the sand addition strength corresponding to the 100m section length is calculated according to the equivalent permeability of the fracture, and the corresponding table of sand addition strength in Table 2 is obtained.

[0081] Table 2 Correspondence between river width and sand addition intensity

[0082] River width (m) Sand adding strength (t / m) 2500 7.4 2000 6.1 1500 5 1000 4.1 500 3.1 300 2.7

[0083] On the basis of Example 1 or 2, the method for designing fracturing parameters based on river channel layout further includes: obtaining a sand adding strength curve corresponding to different river channel widths according to sand adding strength parameters corresponding to different river channel widths, and obtaining a sand adding strength relationship corresponding to different river channel widths.

[0084] like Fig. 9 According to the data in the table, a curve of the relationship between the width of the river channel and the intensity of sand addition is drawn. According to the curve of the relationship between the width of the river channel and the intensity of sand addition, in this embodiment, y1=2.4756e is drawn. 0.0005xThe relationship is used to obtain the design parameters of sand adding intensity based on the width of the river channel. x is the width of the river channel, y1 is the sand adding intensity, and e is a constant, which is 2.71828.

[0085] Example 2

[0086] In a further improvement of this embodiment, the liquid-sand ratio under the maximum liquid control limit is obtained according to the sand adding capacity of dense sandstone, and the liquid intensity relationship corresponding to different river widths is obtained according to the sand adding intensity relationship. The maximum liquid control limit mentioned here is based on the indoor experimental results. Dense sandstone has strong water sensitivity. Under the condition of ensuring the amount of sand added, the pursuit of the minimum amount of liquid can improve the return flow rate and liquid damage, which is helpful to increase the single well production. In this embodiment, according to the implementation effect of dense sandstone in the river channel in the previous practice, when the construction liquid-sand ratio is reduced to 3m 3 / t, the overall performance shows that the lower the liquid-sand ratio, the better the transformation effect, which is consistent with the results of the medium water sensitivity characteristics of the indoor experiment, that is, the required proppant is injected into the formation according to the minimum liquid volume. 3 / t liquid-sand ratio is the maximum liquid control limit, so this example uses the empirical value of 3m 3 / t liquid-sand ratio. Therefore, according to the sand strength above, we get the liquid strength y2 = 7.4268e 0.0005x According to the formula of liquid strength, Table 3 is obtained.

[0087] Table 3 Correspondence between river width and sand addition intensity and liquid intensity

[0088] River width (m) Sand adding strength (t / m) <![CDATA[Strength of the liquid used (m 3 / m)]]> 2500 7.4 22.2 2000 6.1 18.3 1500 5 15 1000 4.1 12.3 500 3.1 9.3 300 2.7 8.1

[0089] Implementation 3

[0090] Reference Fig.10 , which is different from Example 2, is that y1=2.4909e 0.0005x , y2=7.4727e 0.0005x . As shown in Table 4 below.

[0091] Table 4 Correspondence between river channel width and sand addition intensity and liquid intensity

[0092] River width (m) Sand adding strength (t / m) <![CDATA[Strength of the liquid used (m 3 / m)]]> 2500 8.6 26 2000 6.7 20.3 1500 5.2 15.7 1000 4.1 12.3 500 3.1 9.5 300 2.7 8.1

[0093] Implementation 4

[0094] Reference Fig.11 , which is different from Example 2 and Example 3, y1=2.500e 0.0005x , y2=7.500e 0.0005x As shown in Table 5, the correspondence between river width and sand addition intensity and liquid intensity

[0095] River width (m) Sand adding strength (t / m) <![CDATA[Use liquid strength (m 3 / m)]]> 2500 8.7 26.1 2000 6.7 20.3 1500 5.2 15.8 1000 4.1 12.3 500 3.2 9.6 300 2.7 8.1

[0096] Implementation 5

[0097] Reference Fig.12 , which is different from Example 2, Example 3 and Example 4, y1=2.400e 0.0005x , y2=7.200e 0.0005x . As shown in Table 6 below.

[0098] Table 6 Correspondence between river width and sand addition intensity and liquid intensity

[0099] River width (m) Sand adding strength (t / m) <![CDATA[Strength of the liquid used (m 3 / m)]]> 2500 7.2 22 2000 6.0 18.1 1500 4.9 14.9 1000 4 12.3 500 3 9.3 300 2.7 8.1

[0100] Example 6

[0101] This embodiment 6 provides a method for river channel construction in tight gas development, and the river channel is constructed according to the combination of river channel width and fracturing parameters obtained in the method for designing fracturing parameters based on river channel distribution in embodiments 1, 2, 3, 4 or 5. By using the method for river channel construction in tight gas development of the present application, different fracturing parameters are used according to different river channel widths, rather than using uniform parameters, which can greatly reduce the situation where the narrower river channel width is excessively modified, and the wider river channel width section has limited reservoir utilization, thereby greatly improving the single well production.

[0102] Example 7

[0103] In combination with Example 2, on the basis of Example 6, this embodiment provides a method for constructing a river channel in tight gas development, including constructing the river channel according to a combination of river channel width and fracturing parameters, wherein the construction is performed according to the following parameters:

[0104] The proppant is selected in the form of 70 / 140 mesh quartz sand + 40 / 70 mesh coated quartz sand. The 70 / 140 mesh quartz sand is used to support micro cracks, and the 40 / 70 mesh coated quartz sand supports the main cracks to improve the flow conductivity. According to the implementation effect of the dense sandstone in the river channel in the early stage, the 8:2 ratio can not only meet the sufficient flow conductivity, but also achieve a certain sand control and sand consolidation effect. The demand for proppant is obtained according to the sand addition intensity of the above embodiment and the ratio of 70 / 140 mesh quartz sand to 40 / 70 mesh coated quartz sand selected here.

[0105] At the same time, in order to increase the length of artificial fractures and ensure the opening of each cluster of fractures, the design displacement is designed according to 18 cubic meters per minute. The final fracturing parameter design is shown in Table 4 below.

[0106] Table 4 Correspondence between river width and fracturing parameters

[0107]

[0108] The method for constructing a river channel in tight gas development is adopted to realize refined fracturing design, and the river channel is transformed according to the parameters of the method, thereby avoiding the problems of excessive transformation of poor reservoir sections and insufficient transformation of high-quality reservoir sections, ensuring that the reservoir is fully utilized according to the river channel distribution, and greatly improving the economic benefits and the cumulative production of a single well.

[0109] The above displacement is 17~20m 3 / min, or 18m 3 / min、19m 3 / min. The displacement parameter can be used to increase the length of the artificial cracks and ensure that each cluster of cracks is open, so the displacement is designed according to the above displacement parameters.

[0110] The above specific implementation methods further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above are only specific implementation methods of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for designing fracturing parameters based on river channel distribution, characterized in that: include: A channel size model is established, and the set area containing hydraulic fractures is set as a high permeability zone; Obtain the reservoir numerical model, input the production parameters corresponding to the high permeability zones with different river width parameters and different permeability in the river channel size model into the reservoir numerical model for simulation to obtain simulation results, including: Establish a geological model of river channel dense sandstone; Obtain the relationship model between equivalent permeability and cumulative production of reservoir numerical model under different channel widths; Obtain the relationship model between sand volume and equivalent permeability of fractures; According to the channel size model, the preferred equivalent permeability is obtained from the equivalent permeability of the reservoir numerical model and the cumulative production relationship model, and the selection range of the preferred equivalent permeability is 5-10mD; According to the relationship model between sand volume and equivalent permeability of fractures and the preferred equivalent permeability, the sand adding intensity corresponding to the set river channel width is calculated to obtain the sand adding intensity parameters corresponding to different river channel widths; The simulation results are simulated by pressure, and the hydraulic fracture parameters corresponding to different channel width parameters are compared to obtain the combination of channel width and fracturing parameters; The fracturing parameter combination in the combination of the river channel width and the fracturing parameter includes: any one or a combination of two of the sand addition intensity and the fluid intensity; The relationship between sand addition intensity and river channel width is: y1 = (2.4~2.5)e 0.0005x The relationship between liquid intensity and river width is: y2 = (7.2~7.5)e 0.0005x y1 is the sand adding strength, unit is t / m; y2 is the liquid strength, unit is m 3 / m; x is the width of the river, in meters.

2. A method for designing fracturing parameters based on river channel distribution according to claim 1, characterized in that: According to the sand adding intensity parameters corresponding to different river channel widths, a sand adding intensity curve diagram corresponding to different river channel widths is obtained, and according to the sand adding intensity curve diagram, a sand adding intensity relationship formula corresponding to different river channel widths is obtained.

3. A method for designing fracturing parameters based on river channel distribution according to claim 2, characterized in that: According to the sand adding capacity of dense sandstone, the specific liquid-sand ratio under the maximum liquid control limit is obtained; according to the sand adding intensity relationship corresponding to different channel widths and the specific liquid-sand ratio, the liquid intensity relationship corresponding to different channel widths is obtained.

4. A method for river channel construction in tight gas development, characterized in that: According to the combination of river channel width and fracturing parameters obtained in the method for designing fracturing parameters based on river channel distribution as described in any one of claims 1 to 3, the river channel is constructed according to the combination of river channel width and fracturing parameters.

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