井眼扩径对水平井声波测井响应影响的数值模拟

doi:10.11720/wtyht.2022.2447

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Abstract

Horizontal well drilling is increasingly being widely applied. However, sonic logging-one of the most important reservoir assessment methods-tends to be affected by the borehole conditions in the application of horizontal wells,leading to notably reduced application effects.In view of this fact,this paper conducts the forward simulation of the radial and axial size changes induced by borehole enlargement and the changes in enlargement positions using the three-dimensional finite difference method,with the focus on the effects of borehole enlargement on the waveform amplitude,arrival times,and velocities of waves in the sonic logging of horizontal wells.The results are as follows.In the case that the borehole enlargement occurred between the sonic transmitter and the nearest receiver,the changes in borehole enlargement parameters had no effect on the measured results of the compressional and shear wave velocities but led to the notable decrease in waveform amplitude.The amplitude of compressional and shear waves decreased with an increase in the thickness and length of the enlargement cylinder but was almost not affected by the distance between the sonic transmitter and the expansion section.The compressional wave arrival time increased with an increase in the thickness and length of the enlargement cylinder but slightly decreased with an increase in the distance between the sonic transmitter and the expansion section.This study clarifies the laws of the effects of borehole enlargement on the sonic logging response of horizontal wells,and it will provide guidance and assistance for further research on the methods for influencing factor correction in the sonic logging of horizontal wells.

Key words： horizontal well borehole enlargement sonic logging amplitude numerical simulation

Received: 14 September 2020 Published: 28 June 2022

ZTFLH:

P631.4

Corresponding Authors: CAI Ming E-mail: 675450484@qq.com;caiming@yangtzeu.edu.cn

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	Articles by authors
	Lin-Shuai SU
	Ming CAI
	Zhan-Shu ZHENG
	Bao-Bao XU
	Ju-Sen LUO
	Yan-Jie HU
	Jing-Yu ZHANG

Cite this article:

Lin-Shuai SU,Ming CAI,Zhan-Shu ZHENG, et al. Numerical simulation of the effects of borehole enlargement on sonic logging response of horizontal wells[J]. Geophysical and Geochemical Exploration, 2022, 46(2): 467-473.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2022.2447 OR https://www.wutanyuhuatan.com/EN/Y2022/V46/I2/467

Schematic diagram of staggered grid division

Staggered grid difference coefficient for common spatial order

Horizontal well model

Paraments of formation and borehole fluid

The comparison result of 3D-FD and RAI waveforms

Horizontal well model with borehole expansion

Acoustic logging waveforms for different borehole radial expansion sizes

The relationship between compressional and shear wave amplitudes with borehole radial expansion size

The relationship between compressional and shear wave velocities with borehole radial expansion size

The relationship between compressional wave arrival with borehole radial expansion size

Acoustic logging waveforms for different borehole axial expansion sizes

The relationship between compressional wave amplitude with borehole axial expansion size

The relationship between compressional wave arrival with borehole axial expansion size

Acoustic logging waveforms for different borehole expansion position

The relationship between compressional and shear wave amplitudes with borehole expansion position

The relationship between compressional wave arrival with borehole expansion position

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