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    • 3. 发明申请
    • ELECTROMAGNETIC LOGGING BETWEEN A CASED BOREHOLE AND SURFACE
    • 电磁钻孔与表面之间的电磁测井
    • WO2011041248A2
    • 2011-04-07
    • PCT/US2010050338
    • 2010-09-27
    • SCHLUMBERGER CA LTDSCHLUMBERGER TECHNOLOGY BVPRAD RES & DEV LTDSCHLUMBERGER SERVICES PETROLSCHLUMBERGER HOLDINGSZHANG HONGROSTHAL RICHARD A
    • ZHANG HONGROSTHAL RICHARD A
    • G01V3/26E21B47/00G01R33/02G01V3/34
    • G01V3/30G01R33/0354G01R33/04
    • The present disclosure relates to systems and methods for conducting an electromagnetic borehole-to-surface survey of a formation surrounding a borehole. Such methods include deploying a dipole transmitter into the borehole to a depth of investigation, deploying an array of electromagnetic receivers outside of the wellbore, and measuring a response of the formation at the array of electromagnetic receivers deployed outside of the wellbore, for example at the surface. From the response of the formation a property of the formation can be determined based on the response of the formation measured at the array of electromagnetic receivers. For the scenario of a cased well, a local reference receiver may be added at a location proximate the borehole to measure the effective magnetic moment of the transmitter inside the casing, and normalize the formation response in order for a more accurate determination of a formation characteristic, such as resistivity. These receivers can also be used for other types of surveys.
    • 本公开涉及用于对围绕钻孔的地层进行电磁钻孔到地面勘测的系统和方法。 这种方法包括将偶极子发射器部署到钻孔中以进行深入的研究,在井眼外部布置电磁接收器阵列,并且测量在井筒外部布置的电磁接收器阵列处的地层的响应,例如在 表面。 根据地层的响应,可以基于在电磁接收器阵列处测量的地层的响应来确定地层的性质。 对于套管井的情况,可以在靠近钻孔的位置添加本地参考接收器以测量套管内的发射器的有效磁矩,并且对地层响应进行归一化,以便更精确地确定地层特征 如电阻率。 这些接收机也可以用于其他类型的调查。