A method for predicting shale fracturing brittleness index during shale hydraulic fracturing
A technology of brittleness index and hydraulic fracturing, which is applied in the direction of applying stable tension/pressure to test material strength, measuring device, strength characteristics, etc., and can solve the problem that the accurate and effective brittleness index cannot be calculated in different regions
Active Publication Date: 2022-02-15
SOUTHWEST PETROLEUM UNIV
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[0009] The purpose of the present invention is to provide a method for predicting the brittleness index of shale fracturing in the process of shale hydraulic fracturing in view of the fact that most of the existing methods cannot effectively calculate the accurate and effective brittleness index for different regions
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Embodiment 1
[0086] The method for predicting the shale fracturing brittleness index of the present invention is applied to the test of specific shale samples, and the specific steps are as follows:
[0087] (1) Take 42 cores of Yongye 2 well for rock mineral analysis, numbered 1-42, and use X-ray diffractometer to measure the component content of various minerals. The specific data are shown in Table 1.
[0088] Table 1 The percentage of shale minerals
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[0092] (2) The corresponding Young's modulus and Poisson's ratio of the 42 cores were measured by the triaxial rock mechanics test system. The specific data are shown in Table 2.
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The invention discloses a method for predicting shale fracturing brittleness index in the process of shale hydraulic fracturing, which includes measuring the percentage content of each mineral component of each group of rock cores; determining the correlation between each mineral and mechanical properties; Determine the standard amount of each mineral according to the correlation between each mineral and its mechanical properties; determine the percentage content of new brittle minerals in each group of cores; determine the phase difference of each group of cores; The mineral brittleness index of each group of rock cores; the shale brittleness index of each group of rock cores is determined according to the mineral brittleness index of each group of rock cores. The method of the present invention utilizes the heterogeneity of mineral mechanics and the different contributions of different minerals to the mechanical properties of shale to equalize and regionalize the mineral characteristics and mechanical characteristics of shale, and obtain the calculation of brittleness index suitable for different regions This method will provide a more accurate calculation method for the brittleness index for the target reservoir, and solve the problem that the methods in the prior art do not have universal applicability.
Description
technical field [0001] The invention relates to a method for predicting a shale fracturing brittleness index in a shale hydraulic fracturing process, belonging to the technical field of oil and natural gas exploitation. Background technique [0002] As an important part of unconventional oil and gas resources, shale gas has received extensive attention and development due to its huge resources and clean energy. Because the effect of reservoir fracturing is closely related to brittleness, the brittleness method is a commonly used method to evaluate the complexity of reservoir fractures. Correctly knowing the brittleness of the target interval can help save costs better. and increase production. [0003] With the high development of shale gas in various countries, there are more and more types of brittleness indices. Javie et al. (2007) believed that the brittleness of shale depends on the proportion of brittle minerals, and it mainly depends on the content of quartz to judg...
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IPC IPC(8): G01N33/24G01N23/207G01N3/12
CPCG01N33/24G01N23/207G01N3/12G01N2203/0019G01N2203/0048G01N2203/0256G01N2203/0075
Inventor 赵志红赵玉航郭建春
Owner SOUTHWEST PETROLEUM UNIV
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