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A Method for Predicting the Complexity of Hydraulic Fractures Based on Core Residual Stress Level

A technology of residual stress and hydraulic cracks, applied in the direction of applying stable tension/pressure to test material strength, measuring devices, strength characteristics, etc., can solve problems such as inability to carry out engineering design guidance, and achieve low cost and simple modeling operation Effect

Active Publication Date: 2020-04-28
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, FCI does not directly evaluate the fracture network, but is based on microseismic monitoring data, so there is a lot of uncertainty, and it can only perform post-fracture evaluation, and cannot provide early-stage engineering design guidance

Method used

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  • A Method for Predicting the Complexity of Hydraulic Fractures Based on Core Residual Stress Level
  • A Method for Predicting the Complexity of Hydraulic Fractures Based on Core Residual Stress Level
  • A Method for Predicting the Complexity of Hydraulic Fractures Based on Core Residual Stress Level

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Embodiment 1

[0033] Example 1. A method for predicting the complexity of hydraulic fractures based on the core residual stress level, characterized in that the method comprises:

[0034] Step 1: test the static rock mechanics parameters of the sampled core in the implementation well;

[0035] Step 2: Carry out digital simulation tests of rock mechanics parameters based on numerical cores to obtain fine residual strength characteristics of reservoir rock mass;

[0036] Step 3: Establish different finite element analysis models for reservoirs with different layers and residual stresses in the implemented wells, and calculate the hydraulic fracture complexity index for predicting the hydraulic fracture complexity.

[0037] In step 1, the static rock mechanics parameters are static elastic modulus, uniaxial compressive strength, uniaxial tensile strength, residual strength, and static Poisson's ratio.

[0038] In step 2, the digital-analog test of rock mechanics parameters based on numerical...

Embodiment 2

[0047] Example 2. A method for predicting the complexity of hydraulic fractures based on the residual stress level of the core includes the following steps.

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Abstract

The invention discloses a hydraulic fracture complexity prediction method based on the residual stress levels of rock cores. The method is characterized by comprising the following steps: performing physical simulation tests on static rock mechanical parameters of sampled rock cores of an implemented well; performing numerical simulation tests on rock mechanical parameters based on numerical valuerock cores to obtain fine residual strength characteristics of reservoir rock masses; establishing different finite element analytical models for different reservoirs with different residual stress,and calculating hydraulic fracture complexity indexes for predicting hydraulic fracture complexity. The method can be used for catching the whole process of crack production and extension of complex fracture networks in real time, can realize advanced assessment of fracture complexity and guide fracturing construction design and has great significance in improving fracturing design and increasingcomplex fracture network volumes.

Description

technical field [0001] The invention relates to the field of oil field exploitation, in particular to a method for predicting the complexity of hydraulic fractures based on the residual stress level of rock cores. Background technique [0002] In the hydraulic fracturing engineering of shale and other tight oil and gas reservoirs, how to evaluate and predict the complexity of hydraulic fractures is one of the key links in fracturing engineering. At present, the Fracture Complexity Index (FCI) based on microseismic data has been used to characterize the effect of volume fracturing. The higher the FCI value, the more complex the hydraulic fracturing fracture network is, the larger the stimulated volume is, and the better the stimulated effect is. However, FCI does not directly evaluate the fracture network, but is based on microseismic monitoring data, so there is a lot of uncertainty, and it can only perform post-fracture evaluation, and cannot provide early-stage engineerin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/10
CPCG01N3/10G01N2203/0016G01N2203/0048G01N2203/0062
Inventor 张潦源陈勇张全胜卢娜娜李明赵丹星左家强黄波张子麟李潇菲
Owner CHINA PETROLEUM & CHEM CORP
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