公开(公告)号：EP3404202A1

公开(公告)日：2018-11-21

申请号：EP17290062.3

申请日：2017-05-15

申请人： Services Pétroliers Schlumberger ,  Schlumberger Technology B.V. (STBV)

发明人： Hayman, Andrew ,  Klieber, Christoph ,  LE Calvez, Jean-Luc ,  Brill, Thilo

IPC分类号： E21B47/00 ,  G01V1/48

CPC分类号： E21B47/0005 ,  E21B47/101 ,  G01N29/041 ,  G01N29/11 ,  G01N29/42 ,  G01N2291/0232 ,  G01N2291/0427 ,  G01N2291/2636 ,  G01V1/48

摘要： Systems and methods are provided for obtaining a flexural-attenuation measurement for cement evaluation that may be effective even for wells with relatively thick casings. A method includes emitting an acoustic signal at a casing in a well that excites the casing into generating an acoustic response signal containing acoustic waves, such as Lamb waves. The Lamb waves include flexural waves and extensional waves. The casing may be relatively large, having a thickness of at least 16 mm. The acoustic response signal may be detected and filtered to reduce a relative contribution of the extensional waves. This may correspondingly increase a relative contribution of the flexural waves. The filtered acoustic response signal may be used as a flexural-attenuation measurement for cement evaluation.

公开(公告)号：EP2886794A1

公开(公告)日：2015-06-24

申请号：EP13306855.1

申请日：2013-12-23

申请人： Services Pétroliers Schlumberger ,  SCHLUMBERGER TECHNOLOGY B.V. ,  Schlumberger Holdings Limited

发明人： Thierry, Sylvain ,  Klieber, Christoph

IPC分类号： E21B47/00

CPC分类号： G01N29/30 ,  E21B33/14 ,  E21B43/10 ,  E21B47/0005 ,  G01N2291/018 ,  G01N2291/0232 ,  G01N2291/0289 ,  G01V1/44

摘要： Devices and methods for calibrating acoustic cement evaluation data using an acoustic calibration device installed behind a casing in a wellbore are provided. Such an acoustic calibration apparatus may be installed in contact with the outer diameter of a casing and cemented in place with cement in a wellbore. The acoustic calibration apparatus may include a first material different from that of the casing that has first known acoustic properties (e.g., simulating a solid) and a second material different from that of the casing and the cement that has second known acoustic properties (e.g., simulating a liquid or gas). Acoustic measurements obtained by an acoustic logging tool in the wellbore may be calibrated based on the known acoustic properties of the acoustic calibration apparatus.

摘要翻译： 提供了使用安装在井筒中的套管后面的声学校准装置来校准声学水泥评估数据的装置和方法。 这样的声学校准装置可以安装成与外壳的外径接触并且用水泥固定在井眼中。 声学校准装置可以包括与具有第一已知声学特性（例如，模拟固体）的壳体不同的第一材料和与具有第二已知声学特性的壳体和水泥的第二材料不同的第二材料（例如， 模拟液体或气体）。 通过井眼中的声学测井工具获得的声学测量可以基于声学校准装置的已知声学特性来校准。

公开(公告)号：EP3179277A1

公开(公告)日：2017-06-14

申请号：EP15290308.4

申请日：2015-12-11

申请人： Services Pétroliers Schlumberger ,  Schlumberger Holdings Limited ,  SCHLUMBERGER TECHNOLOGY B.V.

发明人： Lemaranko, Mikhall ,  Klieber, Christoph ,  Thierry, Sylvain ,  Bose, Sandip ,  Zeroug, Smaine

IPC分类号： G01V1/50 ,  E21B47/00

CPC分类号： G01V1/306 ,  E21B47/0005 ,  E21B47/082 ,  G01V1/282 ,  G01V1/32 ,  G01V1/50 ,  G01V2210/6224 ,  G01V2210/6226 ,  G01V2210/677

摘要： Techniques involve obtaining acoustic data from an acoustic logging tool, where the acoustic data includes waves reflected from the casing, the annular fill material, the formation, and/or interfaces between any of the casing, the annular fill material, one or more interfaces between any of the mud, the casing, and the annular fill material. Techniques include normalizing the acoustic wave to result in a normalized wave having a comparable spectral shape with a reference wave, and comparing the normalized wave with the reference wave. The reference wave may be generated or modeled or produced from a look-up table or database, and may be estimated based on initial estimates of wellbore parameters. Based on the comparison of the normalized wave with the reference wave, a best-fit reference wave substantially matching the normalized wave may be identified. The best-fit reference wave may correspond with a thickness of the casing, an acoustic impedance of the annular fill material, and an acoustic impedance of mud.

摘要翻译： 技术涉及从声学测井工具获取声学数据，其中声学数据包括从套管，环形填充材料，地层和/或壳体，环形填充材料中的任一个，以及环形填充材料之间的一个或多个界面 任何泥浆，套管和环形填充材料。 技术包括归一化声波以产生具有与参考波相当的光谱形状的归一化波，并将归一化波与参考波进行比较。 参考波可以从查找表或数据库中生成或建模或生成，并且可以基于井筒参数的初始估计来估计。 基于归一化波与参考波的比较，可以识别与归一化波基本匹配的最佳拟合参考波。 最佳拟合参考波可以对应于壳体的厚度，环形填充材料的声学阻抗和泥浆的声学阻抗。