| 摘要: |
| 利用目标导向自适应有限元建立数值模拟模型,计算和分析天线源距、发射频率、地层倾角及围岩电导率等参数变化对随钻方位电阻率测井仪器响应的影响。数值计算结果表明:不同发射频率与天线源距对仪器探测深度影响较大,围岩电导率会影响仪器对地层边界探测的敏感性,地层倾角越大,仪器测量到的地质导向信号幅值衰减越快;利用随钻地质导向信号的极值、极性以及井周电阻率成像,可以快速准确地判断储层边界以及裂缝边缘和走向,为实时钻井地质导向提供依据。 |
| 关键词: 方位电阻率 数值模拟 自适应有限元 仪器响应 地质导向 |
| DOI：10.3969/j.issn.1673-5005.2019.01.005 |
| 分类号::P 631 |
| 文献标识码:A |
| 基金项目:国家自然科学基金项目(41074099);江苏省高等学校自然科学研究项目(17KJB416001) |
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| Numerical simulation of azimuthal resistivity LWD instrument responses |
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LI Hui1, YAN Zhidan2, LIU Changbo3, JIANG Yibo1
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(1.School of Electric Engineering and Photoelectric Engineering, Changzhou Institute of Technology, Changzhou 213002, China;2.College of Information and Control Engineering in China University of Petroleum(East China), Qingdao 266580, China;3.CNPC Bohai Drilling Engineering Limited Company, DDDC, Tianjin 300280, China)
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| Abstract: |
| A goal-orientedself-adaptivefinite element method was used to investigate the electromagnetic wave resistivity logging-while-drilling tool response by adjusting transmitting frequency, coils spacing of antenna array and dipangle of formation. Numerical simulations illustrate that the depth sensitivity is strongly controlled by coils spacing and transmitting frequency. The conductivity of surrounding rock can influence the susceptibility of the tool, especially at the formation boundary. Amplitude attenuation of geo-signal is proportional to the dipangle of formation. Considering the amplitude and polarity of the geo-signal in resistivity imaging of the borehole, the reservoir interface, the edge and the trend of the crack can be quickly determined, making it possible in real-time geosteering. |
| Key words: azimuthal resistivity numerical simulation self-adaptive finite element method tool response geosteering |
