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Fracturing parameter design method based on riverway distribution, and riverway construction method

A technology of parameter design and channel, applied in computer-aided design, design optimization/simulation, calculation, etc., can solve problems such as short artificial fractures, affecting single well production, and limited reservoir producing degree

Pending Publication Date: 2021-10-26
PETROCHINA CO LTD
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  • Application Information

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Problems solved by technology

[0006] Since the tight development is still in the initial stage of development, the design of fracturing parameters has not been optimized for different channel widths. Most single wells use uniform parameters, so it may happen that artificial fractures are too long in the narrow part of the channel and extend to the channel. At the end of the channel, excessive stimulation is caused, while the wide section of the channel has short artificial fractures, which limits the degree of reservoir development and affects the production of a single well

Method used

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  • Fracturing parameter design method based on riverway distribution, and riverway construction method
  • Fracturing parameter design method based on riverway distribution, and riverway construction method
  • Fracturing parameter design method based on riverway distribution, and riverway construction method

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Effect test

Embodiment 1

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

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

[0077] Obtain the relationship model between sand amount and fracture equivalent permeability, such as Figure 8 According to the relationship between fracture permeability and single-segment ...

Embodiment 2

[0086] In the further improvement scheme of this embodiment, according to the sand adding capacity of tight sandstone, the liquid-sand ratio at the maximum liquid control limit is obtained, and according to the sand adding strength relational formula corresponding to different channel widths, the liquid use intensity relationship corresponding to different channel widths is obtained According to the results of indoor experiments, the maximum liquid control limit mentioned here shows that tight sandstone has strong water-sensitive characteristics. Under the condition of ensuring the amount of sand added, the pursuit of the lowest liquid amount can improve the flowback rate and liquid damage. Help increase single well production. In this example, according to the implementation effect of tight 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, ...

Embodiment 3

[0090] refer to Figure 10 , the difference from Example 2 is that y1=2.4909e 0.0005x ,y2=7.4727e 0.0005x . See Table 4 below.

[0091] Table 4 Correspondence between channel width, sanding intensity, and liquid use intensity

[0092] Channel width (m) Sanding strength (t / m) Liquid strength (m 3 / m)

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Abstract

The invention discloses a fracturing parameter design method based on riverway distribution, and a riverway construction method in tight gas development. The method comprises the following steps of: setting a high-permeability zone containing a hydraulic fracture; implanting the high-permeability zone into an oil reservoir numerical model; inputting each parameter into the oil reservoir numerical model for simulation to obtain a simulation result; performing screening according to hydraulic fracture parameters in a simulation result to obtain optimal hydraulic fracture parameters; through pressure simulation software, comparing the optimal hydraulic fracture parameters corresponding to different river width parameters to obtain a combination of river widths and fracturing parameters. According to the method, a one-section-one-parameter differentiation design can be achieved, and a basis is provided for later effect evaluation and reservoir optimization; meanwhile, the problems that reservoir difference sections are excessively transformed, and high-quality sections of a reservoir are insufficiently transformed, can be avoided, so that it is ensured that the reservoir is fully used according to river channel distribution, and the economic benefit and a single-well cumulative production volume are greatly improved.

Description

technical field [0001] The invention relates to the development of tight gas, in particular to a method for designing fracturing parameters based on channel distribution, and also to a method for channel construction in the development of tight gas. Background technique [0002] The development of tight gas in my country began in the 1970s, but due to the constraints of "heavy oil and light gas" and technical conditions, the development was relatively slow. The favorable exploration area is 320,000 square kilometers, and the geological resources are 17.45-25.1 trillion cubic meters, which are mainly distributed in the seven basins of Ordos, Sichuan and Songliao. Academician Qiu Zhongjian pointed out in 2012 that the national tight gas resources are about 20 trillion cubic meters, The amount of technically recoverable resources is about 10 trillion cubic meters, showing huge development potential. [0003] Geological parameters such as reservoir porosity, permeability, and p...

Claims

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Application Information

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IPC IPC(8): G06F30/28G06F111/10G06F113/08G06F119/14
CPCG06F30/28G06F2111/10G06F2113/08G06F2119/14
Inventor 郑有成范宇王瀚成周长林刘飞王峻源方鸿铭唐波涛颜洁曾嵘
Owner PETROCHINA CO LTD
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