Emission Frequency Optimization of Borehole Imaging for Dipole Acoustic Remote Detection of Slow Formations
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摘要:
为了提高慢速地层偶极声波远探测丛式井邻井井眼成像的图像质量，优选了偶极声源的最佳发射频率。根据慢速地层中偶极辐射声场理论，计算偶极纵波辐射波能流和辐射指向性，分析它们随频率的变化规律，结合试验井测试和现场应用情况，确定适合浅层慢速地层邻井成像的偶极声源最佳激发频率为2.4 kHz。研究结果表明，在测井资料质量良好的情况下，采用该激发频率处理得到的邻井远探测成像图清晰可靠，对图中反射体进行识别，能够确定邻井相对测量井的距离和方位，利用此结果可以指导浅层丛式井邻井防碰。研究结果为开发过程中丛式井邻井防碰提供了新的技术手段。
Abstract:In order to improve the quality of adjacent borehole imaging of cluster wells by dipole acoustic remote detection of slow formations, the optimal emission frequency of the dipole sonic source was determined. According to the theory of dipole radiation sound field in slow formations, the energy flow of radiation wave and the radiation directivity of dipole P-wave were calculated, and their change law with the frequency variation were analyzed. In combination with the tests in experimental wells and field application, the optimal excitation frequency of the dipole sonic source suitable for adjacent well imaging in shallow and slow formations was determined as 2.4 kHz. The results showed that with good logging data quality, the remote detection imaging map of adjacent wells obtained and processed by the excitation frequency was clear and reliable, and identifying the reflectors in the map could determine the distance and azimuth of adjacent wells to logging wells. The results can guide the anti-collision of adjacent wells in shallow cluster wells and provide a new technical method for the anti-collision of adjacent wells in cluster wells within development phase.
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图 1 充液井孔中偶极声源向井旁地层中辐射声场的柱坐标系
Figure 1. A cylindrical coordinate system for the sound radiation field from the dipole sonic source in the liquid-filled borehole to its vicinity
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图 2 偶极声源在慢速地层中的辐射波能流
Figure 2. Energy flow of radiation wave of dipole sonic source in slow formations
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图 3 偶极纵波辐射能流峰值点处的偶极纵波辐射指向性
Figure 3. Radiation directivity of dipole P-wave at the peak point of energy flow of dipole P-wave radiation
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图 4 激发频率为2.4 kHz时不同滤波频率下的邻井远探测成像图
Figure 4. Imaging map of adjacent wells through remote detection with an excitation frequency of 2.4 kHz under different filtering frequencies
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图 5 激发频率为8.0 kHz时不同滤波频率下的邻井远探测成像图
Figure 5. Imaging map of adjacent wells through remote detection with an excitation frequency of 8.0 kHz under different filtering frequencies
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图 6 某区块井深250和380 m处的井位平面分布
Figure 6. Lay out of wellbores at well depth of 250 m and 380 m in a block
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图 7 w6井邻井远探测成像解释成果
Figure 7. Imaging results of adjacent wells of Well w6 through remote detection
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图 9 不同井段A1井井旁反射体方位示意
Figure 9. Orientation of reflector near Well A1 in different well sections
表 1 远探测成像图中各反射体信息
Table 1 Information of reflectors in remote detection imaging map
反射体
序号井段/m 反射信息
分布方位/（º）反射信息
最强方位/（º）离测量井
距离/m反射信息可能
代表的邻井不同井深距测量井的距离/m 250 m 380 m 1 240～338 0～120（180～300） 60（240） 2～15 w1井 6 2 240～310 0～90（180～270） 50（230） 5～15 w2井 7 3 215～270 60～120（240～300） 90（270） 4～13 w7井或1井或w22井 9 4 215～270 110～180（290～360） 150（330） 7～15 w3井 11 5 320～460 140～180（320～360） 170（350） 2～7 w11井 6 6 320～460 140～180（320～360） 180（360） 7～15 w3井 9 7 350～430 30～90（210～270） 70（250） 10～7 w7井 9 8 340～430 80～150（260～330） 90（270） 7～10 1井 9 9 340～360 30～90（210～270） 70（250） 7～9 w22井 
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