裂缝对井眼声波的传播影响规律研究

doi:10.11720/wtyht.2019.0265

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Abstract

In tight oil and gas reservoirs,cracks are important seepage channels and reservoir spaces for hydrocarbon migration.The development of the crack directly controls the reservoir performance.In order to evaluate the crack development by using the shear and Stoneley wave attenuation information,the authors used the three-dimensional variable grid time domain finite difference method to study the influence of crack widths and angles on shear and Stoneley wave attenuation in the wellbore environment.The results show that,as the crack width increases,the transmitted Shear wave and the Stoneley wave undergo energy decay.When the crack is tilted,the transmission Stoneley wave is insensitive to the crack dip.As the dip angle becomes larger,the attenuation does not change much.However,the transmitted shear wave is more sensitive to the crack dip.When the crack dip angle is 0°,the transmitted shear wave attenuation amplitude is the largest.As the dip angle of the crack becomes larger,the attenuation of the transmitted shear wave becomes significantly smaller.When the crack dip angle is greater than 25°,the attenuation amplitude of the transmitted shear wave becomes smaller and smaller as the angle increases.In addition,the numerical simulation of the shear wave attenuation curve is compared with the shear wave attenuation curve in the physical experiment, and the two are in good agreement.This study has a certain theoretical guidance for improving the acoustic logging evaluation method of fractured reservoirs.

Key words： micron-scale cracks Stoneley wave shear wave crack dip numerical simulation

Received: 13 May 2019 Published: 28 November 2019

P631.4

Corresponding Authors: Cheng-Guang ZHANG E-mail: zhangcg@yangtzeu.edu.cn

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	Li LIU
	Cheng-Guang ZHANG
	Ming CAI
	Yang HE
	Yu-Jin HUA
	Yu LIU

Cite this article:

Li LIU,Cheng-Guang ZHANG,Ming CAI, et al. Studies on the effec of crack on the propagation of acoustic waves in wellbore[J]. Geophysical and Geochemical Exploration, 2019, 43(6): 1333-1340.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2019.0265 OR https://www.wutanyuhuatan.com/EN/Y2019/V43/I6/1333

The hole model in a cracked formation

The variable grid difference schematic

The parameters of the media

The comparison results of finite difference and real axis integration method

The waveform overlay of different crack widths
a—the crack dip angle of 0°;b—the crack dip angle of 25°

The relationship between crack width and Stoneley wave attenuation coefficient
a—the crack dip angle of 0°;b—the crack dip angle of 25°

The relationship between crack width and shear wave attenuation coefficient
a—the crack dip angle of 0°;b—the crack dip angle of 25°

The waveform comparison chart of different dip angles

TheStoneley wave attenuation curve with different dip angles

The shear wave attenuation curve with different dip angles

Drilling core

Waveform measurement device of small core

Arraywaveforms of small core with different crack width

Relationship between shear wave attenuation coefficient and crack width of core samples with different dip angles
a—the crack dip angle of 0°;b—the crack dip angle of 25°;c—the crack dip angle of 55°;d—a comprehensive analysis of the attenuation curves of different dip angles

The attenuation curve overlay

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