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    • 5. 发明授权
    • Method and apparatus utilizing NMR measurements to gather information on a property of the earth formation surrounding a wellbore
    • 采用核磁共振测量方法和装置来收集围绕井筒的地层的性质的信息
    • US06808028B2
    • 2004-10-26
    • US10308957
    • 2002-12-03
    • Charles WoodburnRalf Heidler
    • Charles WoodburnRalf Heidler
    • E21B4706
    • G01V3/32
    • A method is provided for gathering information on the pore pressure in an earth formation surrounding a wellbore. The method includes the initial steps of selecting at least one suitable property (e.g., porosity, drilling fluid composition, etc.) of the drilling environment (which is defined by the wellbore and the surrounding formation) and at least one NMR parameter (e.g., T2 distribution) in an NMR measurement response. The method selects a suitable property for which values over a plurality of wellbore depths can be correlated with the characteristics or behavior of the pore pressure in the earth formation. The method further includes conducting an NMR measurement at a plurality of wellbore depths, thereby generating an NMR response from the drilling environment. The measured values of the NMR parameter in the NMR response are then correlated with values of the suitable property. Next, the values of the suitable property are compared over the plurality of depths, and then the correspondence between the property values is correlated with the behavior of the pore pressure over the plurality of depths. In this way, the characteristics of the pore pressure in the earth formation over the plurality of wellbore depths are determined.
    • 提供一种用于收集围绕井眼的地层中的孔隙压力的信息的方法。 该方法包括首先选择钻井环境(由井眼和周围地层定义)和至少一个NMR参数(例如,孔隙度,钻井液组成等)的至少一种合适的性质 T2分布)。 该方法选择合适的属性,其中多个井筒深度的值可以与地层中的孔隙压力的特性或行为相关联。 该方法还包括在多个井筒深度处进行NMR测量,从而从钻井环境产生NMR响应。 然后将NMR响应中的NMR参数的测量值与适当性质的值相关。 接下来,在多个深度上比较合适的属性的值,然后将属性值之间的对应关系与多个深度上的孔隙压力的行为相关联。 以这种方式,确定多个井筒深度中的地层中孔隙压力的特征。