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Method for determining fracturing index of shale formation

A shale and formation technology, applied in the field of determining the fracturing index of shale formations, can solve problems such as poor operability, complicated calculation process, and lack of information

Inactive Publication Date: 2016-01-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In the prior art, the main basis for designing the spacing of fracturing fractures is to avoid interference between fractures. This method needs to be completed by numerical simulation. The calculation process is complicated and the actual operability is not strong.
Moreover, using the brittleness index and stress anisotropy to design the number of perforations and fracturing only gives a qualitative solution, but does not give a quantitative method

Method used

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  • Method for determining fracturing index of shale formation
  • Method for determining fracturing index of shale formation
  • Method for determining fracturing index of shale formation

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Embodiment 1

[0038] The following combination figure 2 The steps of the method for determining the fracturability index of shale formations in the embodiment of the present invention are described in detail.

[0039] In step S201, multiple fracturable influencing factors used to characterize the reservoir quality and fracturing engineering quality of the shale formation are determined according to the logging data. According to the actual logging conditions in different geological regions, different fracturing influencing factors are selected, such as brittleness index, engineering geological index, flow index, effective stress and number of fractures, etc.

[0040] In this embodiment, the three items of brittleness index, engineering geological index, and flow index are selected as factors affecting fracturing. It should be noted that the brittleness index is mandatory, and other fracturing factors can be selected from at least two of engineering geological index, flow index, effective ...

Embodiment 2

[0081] In this embodiment, the method provided in this embodiment is described by taking the logging data of a well in a shale formation in a block in Southwest China as an example.

[0082] The lithology of high-quality shale in this block is mainly composed of yellow-gray shale and silty shale interbedded with thin lenticular limestone. In the XX10-XX20 section, the average brittleness index X is 53. The average number of fractures is 6 / m, and the average minimum in-situ stress is 25Mpa. The calculated engineering geological index Y is 0.24. Since the maximum engineering geological index in this block is 0.4, the normalized result of the engineering geological index in this well section is 60. The shale formation in this well is mainly divided into three types of flow units, and the second type of flow units dominates in this well section, with an average flow index Z of 2.1. Since the maximum shale formation flow index in this block is 2.65, the normalized flow index is 79...

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Abstract

The invention discloses a method for determining a fracturing index of a shale formation. The method comprises the following steps of determining a plurality of fracturing influence factors used for representing reservoir quality and fracturing engineering quality of the shale formation according to logging information; respectively determining weight coefficients of the various fracturing influence factors by using an analytic hierarchy process; and performing weighted summation on the various fracturing influence factors to obtain the fracturing index. By the method, the fracturing index is determined according to brittleness, stress states, fracture distribution, porosity, permeability and fracturing effects of the shale formation and rock physical properties of the formation, and the pressing ability of the shale formation can be described quantitatively.

Description

technical field [0001] The invention relates to the technical field of shale oil and gas exploration and development, in particular to a method for determining the fracturing index of shale formations. Background technique [0002] Shale formations are usually low-porosity and low-permeability formations, which are difficult to develop effectively by conventional mining methods. Fracturing is an essential tool in the development of shale formations. Fracturing design needs to consider how to select parameters such as horizon, perforation and fracturing quantity, and different parameters need to be selected for different shale formations. In 2012, JonathanC used the rock mechanics parameters to calculate the fracturing fracture spacing under different parameters by numerical simulation method. C. Cipolla in 2011 designed perforation and fracturing levels and quantities according to the brittleness index and stress anisotropy of shale formations. [0003] In the prior art, ...

Claims

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Application Information

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IPC IPC(8): E21B49/00
Inventor 廖东良张卫王志战刘江涛秦黎明魏历灵
Owner CHINA PETROLEUM & CHEM CORP
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