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Method for predicting complexity of fracture network formed by shale fracturing

A technology of complexity and forecasting methods, applied in forecasting, instrumentation, data processing applications, etc., and can solve problems such as non-universal applicability

Active Publication Date: 2020-06-12
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

[0009] The purpose of the present invention is to solve the problem that the existing method has great differences in different regions and does not have universal applicability. In order to solve the problem of universal applicability, the present invention provides a new method for shale hydraulic Prediction method of fracture network complexity in shale fracturing during fracturing

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  • Method for predicting complexity of fracture network formed by shale fracturing
  • Method for predicting complexity of fracture network formed by shale fracturing
  • Method for predicting complexity of fracture network formed by shale fracturing

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Embodiment Construction

[0021] Preferred embodiments of the present invention are described below, and it should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0022] The method for predicting the complexity of the fracture network formed by shale fracturing of the present invention is applied to the test of specific shale samples, and the specific steps are as follows:

[0023] (1) Take 10 cores from Well Yongye 2 for rock mineral analysis, numbered 1-10. For the convenience of calculation, the total mass of the core samples taken is 100 grams, and various brittle mineral components are determined by X-ray diffractometer The content of the specific data is shown in Table 1, and the percentage content of each component can be simply obtained.

[0024] Table 1 Rock mineral composition

[0025]

[0026] (2) Determine the standard amount as 16.7%.

[0027] (3) Recalcula...

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Abstract

The invention discloses a method for predicting the complexity of a fracture network formed by shale fracturing, and the method comprises the steps: S1, determining the percentage contents of variousminerals, including quartz, orthoclase, plagioclase, pyrite, calcite, dolomite and other substances, of a shale core; s2, then determining the standard quantity to be 16.7% by utilizing the variety ofbrittle minerals; s3, recalculating the percentage contents of various brittle mineral components by only considering the brittle minerals; s4, determining a phase difference k by utilizing the standard quantity and the newly determined mineral percentage content; s5, calculating the brittleness B of the brittle mineral; and S6, finally, the brittleness index BI is determined by combining other minerals, and the larger the brittleness index BI value is, the larger the number of cracks is, and the more complex the fracture network formed through fracturing is. The invention provides a novel prediction method for the complexity of a fracture network formed by shale fracturing.

Description

technical field [0001] The invention relates to the technical field of petroleum and natural gas exploitation, in particular to a method for predicting the complexity of fracture networks formed by shale fracturing in the shale hydraulic fracturing process. Background technique [0002] As an important part of unconventional oil and gas resources, shale gas has been widely valued and developed due to its huge resources and clean characteristics of energy. Because the fracturing effect of the reservoir is closely related to the brittleness, the brittleness method is used to evaluate the complexity of reservoir fractures is a common method at present. Correctly knowing the brittleness of the target interval is helpful for better cost savings and increase production. [0003] With the high development of shale gas in various countries, more and more types of brittleness indices have been established. Javie et al. (2007) believed that the brittleness of shale depends on the pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/04G06Q10/06G06Q50/02
CPCG06Q10/04G06Q10/06393G06Q50/02
Inventor 赵志红赵玉航郭建春陈朝刚
Owner SOUTHWEST PETROLEUM UNIV
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