RVSP勘探炸药震源爆炸的数值仿真
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摘要
针对RVSP勘探存在的既要获得高的地震波能量,又要保证油井套管不被炸坏的矛盾,在理论分析的基础上,使用AUTODYN数值仿真软件,研究了油井材料对炸药能量传递的影响,得到了距离震源10m处的质点振动速度和压力变化曲线;分析了炸药震源半径与油井套管的变形的关系;讨论了炸药震源长度与其能量传递以及油井套管变形的关系。开展了相应的实验研究,数值仿真与实验结果吻合较好。研究结果可以为RVSP勘探的工程应用提供参考和依据。
To achieve that a dynamite source should provide high seismic energy without destroying the oil well in the reversed vertical seismic profile(RVSP) prospecting of petroleum,theoretical analysis was carried out for the energy transfer of the dynamite source and finite element models were developed for the dynamite source and its surrounding media in the oil well.Numerical simulations were conducted by applying the AUTODYN-2 Dsoftware to explore the interaction between the oil well and the dynamite source.The vibration velocity and pressure curves were obtained for the particle located 10m away from the seismic source to investigate the influences of the media in the oil well on the energy transfer of the dynamite source.Effects of the charge diameters on the deformation of the oil well pipe were analyzed.And some discussion was made on the effects of the charge length on the energy transfer of the dynamite source and the deformation of the oil well pipe.The corresponding experiment was implemented to compare with the numerical results.The numerical results are consistent with the experimental observations.The research can provide help for the engineering application of the RVSP prospecting.
To achieve that a dynamite source should provide high seismic energy without destroying the oil well in the reversed vertical seismic profile(RVSP) prospecting of petroleum,theoretical analysis was carried out for the energy transfer of the dynamite source and finite element models were developed for the dynamite source and its surrounding media in the oil well.Numerical simulations were conducted by applying the AUTODYN-2 Dsoftware to explore the interaction between the oil well and the dynamite source.The vibration velocity and pressure curves were obtained for the particle located 10m away from the seismic source to investigate the influences of the media in the oil well on the energy transfer of the dynamite source.Effects of the charge diameters on the deformation of the oil well pipe were analyzed.And some discussion was made on the effects of the charge length on the energy transfer of the dynamite source and the deformation of the oil well pipe.The corresponding experiment was implemented to compare with the numerical results.The numerical results are consistent with the experimental observations.The research can provide help for the engineering application of the RVSP prospecting.
引文
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[8]陈刚,陈忠富,陶俊林,等.45钢动态塑性本构参量与验证[J].爆炸与冲击,2005,25(5):451-456.CHEN Gang,CHEN Zhong-fu,TAO Jun-lin,et al.Investigation and validation on plastic constitutive parameters of45steel[J].Explosion and Shock waves,2005,25(5):451-456.
[9]李文彬,郑宇,王晓鸣,等.延时叠加震源对地表震动的数值仿真[J].石油地球物理勘探,2009,44(3):257-262.LI Wen-bin,ZHENG Yu,WANG Xiao-ming,et al.Numeric simulation of time-delayed stack source for surface vi-bration[J].Oil Geophysical Prospecting,2009,44(3):257-262.
[2]Mao W J,Stuart G W.Transmission-reflection tomography:Application to reverse VSP data[J].Geophysics,1997,62(3):884-898.
[3]朱龙生.多方位角逆VSP层析成像[D].西安:长安大学,2003.
[4]何正勤,吴庆举,冯锐,等.反向VSP透射层析成像法在岩墙松动层检测中的应用[J].物探与化探,2001,25(1):50-53.HE Zheng-qin,WU Qing-ju,FENG Rui,et al.The application of pseudo-VSP method to the detection of loosened zone in quarry wall[J].Geophysical and Geochemical Exploration,2001,25(1):50-53.
[5]Gurney R W.Fragments from bombs,shells and grenades[R].BRL Report635,1947.
[6]李文彬,王晓鸣,赵国志,等.高分辨率地震勘探的垂向叠加震源研究[J].南京理工大学学报,2002,26(1):44-47.LI Wen-bin,WANG Xiao-ming,ZHAO Guo-zhi,et al.Study of superimposed seismic source in vertical direction on high distinguishability exploration[J].Journal of Nanjing University of Science and Technology,2002,26(1):44-47.
[7]Century Dynamics Ltd.Interactive Non-linear Dynamic Analysis Software User Manual[M].Ramon,USA:Centu-ry Dynamics Incorporated,2001:86-102.
[8]陈刚,陈忠富,陶俊林,等.45钢动态塑性本构参量与验证[J].爆炸与冲击,2005,25(5):451-456.CHEN Gang,CHEN Zhong-fu,TAO Jun-lin,et al.Investigation and validation on plastic constitutive parameters of45steel[J].Explosion and Shock waves,2005,25(5):451-456.
[9]李文彬,郑宇,王晓鸣,等.延时叠加震源对地表震动的数值仿真[J].石油地球物理勘探,2009,44(3):257-262.LI Wen-bin,ZHENG Yu,WANG Xiao-ming,et al.Numeric simulation of time-delayed stack source for surface vi-bration[J].Oil Geophysical Prospecting,2009,44(3):257-262.
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