METHOD FOR ACCENTUATING SIGNAL FROM AHEAD OF THE BIT
    3.
    发明申请
    METHOD FOR ACCENTUATING SIGNAL FROM AHEAD OF THE BIT 审中-公开
    从位的前端识别信号的方法

    公开(公告)号:US20100213943A1

    公开(公告)日:2010-08-26

    申请号:US12710438

    申请日:2010-02-23

    IPC分类号: G01V3/18

    摘要: A method for estimating a property of a portion of an earth formation ahead of a borehole penetrating the formation, the method includes: conveying a logging tool through the borehole; receiving one or more first signals from a previous depth of the logging tool; constructing a model of the earth formation using the one or more first signals; predicting one or more second signals from the portion of the earth formation ahead of the borehole using the model; receiving one or more third signals from the portion of the earth formation ahead of the borehole; calculating a difference between the one or more third signals and the one or more second signals; and estimating the property from the difference.

    摘要翻译: 一种用于估计穿过地层的井眼之前的地层的一部分的性质的方法,所述方法包括:将测井工具传送通过所述钻孔; 从测井工具的先前深度接收一个或多个第一信号; 使用所述一个或多个第一信号构造地层的模型; 使用该模型预测来自钻孔前方的地层部分的一个或多个第二信号; 从钻孔前面的地层部分接收一个或多个第三信号; 计算所述一个或多个第三信号与所述一个或多个第二信号之间的差; 并从差异估算属性。

    Method for simultaneous inversion processing of well log data using a
plurality of earth models
    7.
    发明授权
    Method for simultaneous inversion processing of well log data using a plurality of earth models 失效
    使用多个地球模型同步反演处理测井数据的方法

    公开(公告)号:US5878372A

    公开(公告)日:1999-03-02

    申请号:US811523

    申请日:1997-03-04

    IPC分类号: G06F17/12 G06F19/00

    CPC分类号: G06F17/12

    摘要: A method of determining a plurality of formation models each of which will simulate the response of a well logging instrument. A measured response of the well logging instrument is used to generate an initial model using inversion processing. A response of the instrument to the initial model is synthesized. A singular value decomposition is performed on the synthetic response to generate eigenparameters of the initial model. Eigenparameters having the least significant overall contribution to the synthetic response are sequentially substituted with linear equations representing prior constraints on the initial earth model. A linear system, including the remaining ones of the eigenparameters and the linear equations is solved so that the eigenparameters are preserved exactly and the linear equations satisfy a least squares fit. An additional synthetic instrument response is generated for each solution to the linear system which falls below a predetermined error threshold. The additional instrument responses are compared with the synthesized response to the initial model. The one of the solutions to the linear system which represents an earth model providing minimum misfit with respect to equations representing the prior constraints is selected as the best fit model.

    摘要翻译: 一种确定多个地层模型的方法,每个地层模型都将模拟测井仪器的响应。 使用测井仪器的测量响应来生成使用反演处理的初始模型。 合成仪器对初始模型的响应。 对合成响应执行奇异值分解以产生初始模型的特征参数。 具有对合成响应的最小有效总体贡献的特征参数被顺序地替换为表示在初始地球模型上的先前约束的线性方程式。 解决包括本征参数和线性方程中的其余线性系统的线性系统,使得本征参数被精确地保留,并且线性方程式满足最小二乘拟合。 对于低于预定误差阈值的线性系统的每个解决方案产生另外的合成仪器响应。 将额外的仪器响应与对初始模型的合成响应进行比较。 线性系统的解决方案之一是代表提供关于代表先前约束的方程的最小失配的地球模型,被选为最佳拟合模型。

    Geosteering in earth formations using multicomponent induction measurements
    10.
    发明授权
    Geosteering in earth formations using multicomponent induction measurements 有权
    使用多组分感应测量的地球导向地球导向

    公开(公告)号:US07421345B2

    公开(公告)日:2008-09-02

    申请号:US11744702

    申请日:2007-05-04

    IPC分类号: G01V1/04 G06G7/48

    CPC分类号: G01V3/28

    摘要: A multicomponent induction logging tool is used on a MWD bottomhole assembly. Multifrequency focusing that accounts for the finite, nonzero, conductivity of the mandrel is applied. Using separation of modes, the principal components and a direction of a conductivity tensor are determined. The results are used for reservoir navigation in earth formations. It is emphasized that this abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. 37 CFR 1.72(b)

    摘要翻译: 在MWD井底组件上使用多组分感应测井工具。 应用了考虑到心轴有限非零导电性的多频聚焦。 使用模式分离,确定主成分和电导率张量的方向。 结果用于地层中的油藏导航。 要强调的是,该摘要被提供以符合要求摘要的规则,这将允许搜索者或其他读者快速确定技术公开的主题。 提交它的理解是,它不会用于解释或限制权利要求的范围或含义。 37 CFR 1.72(b)