In-situ stress is a common stress in the exploration and development of oil reservoirs. Therefore, it is of great significance to study the propagation characteristics of borehole acoustic waves in fluid-saturated porous media under stress. Based on the acoustoelastic theory of fluid-saturated porous media, the field equation of fluid-saturated porous media under the conditions of confining pressure and pore pressure and the acoustic field formula of multipole source excitation in open hole are given. The influences of pore pressure and confining pressure on guided waves of multipole borehole acoustic field in fluid-saturated porous media are investigated. The numerical results show that the phase velocity and excitation intensity of guided wave increase significantly under the confining pressure. For a given confining pressure, the phase velocity of the guided wave decreases with pore pressure increasing. The excitation intensity of guided wave increases at low frequency and then decreases at high frequency with pore pressure increasing, except for that of Stoneley wave which decreases in the whole frequency range. These results will help us get an insight into the influences of confining pressure and pore pressure on the acoustic field of multipole source in borehole around fluid-saturated porous media.
机构:
China Univ Petr East China, Natl Key Lab Deep Oil & Gas, Qingdao 266580, Peoples R China
Laoshan Lab, Qingdao 266580, Peoples R China
Curtin Univ, Ctr Explorat Geophys, Perth, WA 6845, AustraliaChina Univ Petr East China, Natl Key Lab Deep Oil & Gas, Qingdao 266580, Peoples R China
Chen, Fubin
Zong, Zhaoyun
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China Univ Petr East China, Natl Key Lab Deep Oil & Gas, Qingdao 266580, Peoples R China
Laoshan Lab, Qingdao 266580, Peoples R ChinaChina Univ Petr East China, Natl Key Lab Deep Oil & Gas, Qingdao 266580, Peoples R China
Zong, Zhaoyun
Rezaee, Reza
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Curtin Univ, Western Australia Sch Mines Minerals Energy & Che, Dept Petr Engn, Perth, WA 6151, AustraliaChina Univ Petr East China, Natl Key Lab Deep Oil & Gas, Qingdao 266580, Peoples R China
Rezaee, Reza
Yin, Xingyao
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China Univ Petr East China, Natl Key Lab Deep Oil & Gas, Qingdao 266580, Peoples R China
Laoshan Lab, Qingdao 266580, Peoples R ChinaChina Univ Petr East China, Natl Key Lab Deep Oil & Gas, Qingdao 266580, Peoples R China
机构:
Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hung Hom, Kowloon, Hong Kong, Peoples R ChinaHong Kong Polytech Univ, Dept Civil & Environm Engn, Hung Hom, Kowloon, Hong Kong, Peoples R China
Wang, Luyu
Yin, Zhen-Yu
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Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hung Hom, Kowloon, Hong Kong, Peoples R ChinaHong Kong Polytech Univ, Dept Civil & Environm Engn, Hung Hom, Kowloon, Hong Kong, Peoples R China
Yin, Zhen-Yu
Chen, Weizhong
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Chinese Acad Sci, Inst Rock & Soil Mech, Wuhan 430071, Peoples R ChinaHong Kong Polytech Univ, Dept Civil & Environm Engn, Hung Hom, Kowloon, Hong Kong, Peoples R China