Method for evaluating fracturing property of shale based on rock debris microscopic characteristics

An evaluation method and cuttings technology, applied in material inspection products, soil material testing and other directions, can solve the problems of high experimental cost, low drilling and coring rate, long time consumption, etc., and achieve convenient and fast operation, high promotion value, and simple operation. Effect

Active Publication Date: 2016-03-30
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

[0011] The purpose of the present invention is to effectively evaluate the fracturability of shale reservoirs, overcome the defects of the prior art that only analyzes a single factor affecting the formation of fractu

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  • Method for evaluating fracturing property of shale based on rock debris microscopic characteristics
  • Method for evaluating fracturing property of shale based on rock debris microscopic characteristics
  • Method for evaluating fracturing property of shale based on rock debris microscopic characteristics

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Embodiment Construction

[0034] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0035] Take the relevant data of well R in a certain area as an example, such as figure 1 figure 2 , image 3 , Figure 4 , Figure 5 , Image 6 As shown, the present invention is a shale fracturing evaluation method based on the microscopic characteristics of cuttings, and the method includes the following steps:

[0036] ① Take the shale cuttings at a specific depth of the reservoir, collect the cuttings accurately, and measure the late time according to the specified time interval to ensure the continuity and representativeness of the cuttings. Eliminate fake rock fragments with blurry tone, unobvious edges and corners, and larger individuals (non-stratification); or directly use cored core fragments. After the test cuttings are obtained, the cuttings are cleaned and dried to remove the drilling fluid attached to the surface. According to the requirem...

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Abstract

The invention discloses a method for evaluating fracturing property of shale based on rock debris microscopic characteristics. The method comprises the following steps: (1) taking the rock debris at specific depth in reservoir of an oil gas well; (2) acquiring the relative amount of total-rock minerals through X-ray diffraction test for the rock debris, and calculating a brittleness index I1 of the minerals; (3) testing the nanoindentation microcosmic mechanical parameters of the rock debris and calculating a microcosmic mechanical brittleness index I2 thereof; (4) calculating the surface crack fractal parameter of the rock debris through scanning electron microscope, thereby acquiring a fractal brittleness index I3; (5) performing 3D laser scanning on the rock debris and calculating the surface rough brittleness index I4; (6) weighting the above four brittleness indexes according to the practical condition of the oil field, thereby acquiring a comprehensive fracturing index I; (7) repeating the steps (1)-(6), calculating the fracturing indexes of the rock debris at different depths and drawing a whole-well comprehensive fracturing index longitudinal layout. According to the method provided by the invention, the comprehensive fracturing index of the shale rock debris can be acquired and the necessary basis is supplied for fracture selecting layer with core-taking difficulty or without core shale reservoir.

Description

Technical field [0001] The invention relates to a shale fracturability evaluation method based on the microscopic characteristics of rock cuttings, which belongs to the technical field of unconventional oil and gas development, and is especially aimed at the field of shale gas development. Background technique [0002] With the continuous rapid development of my country's national economy, my country has become the world's second largest crude oil importer, and its dependence on foreign sources has approached 60%. Therefore, while increasing the exploration and development efforts in new areas and areas of oil and gas, looking for new alternative energy sources has become an important strategic measure to ensure national energy security and national security. In order to realize the sustainable development of my country's energy industry, it is necessary to strengthen the exploration, development and utilization of unconventional oil and gas resources such as shale oil and gas, c...

Claims

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Application Information

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IPC IPC(8): G01N33/24
CPCG01N33/24
Inventor 陶雷朱海燕姚志龙雯赵芙蕾
Owner SOUTHWEST PETROLEUM UNIV
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