Wellbore Characterization Through Multi-Dimensional Visualization Provides Mechanical Integrity Surveillance Solutions Beyond the Current Norm
- Gary Frisch (Halliburton) | Phil Fox (Halliburton) | Roddy Hebert (Halliburton)
- Document ID
- Society of Petrophysicists and Well-Log Analysts
- SPWLA 60th Annual Logging Symposium, 15-19 June, The Woodlands, Texas, USA
- Publication Date
- Document Type
- Conference Paper
- 2019. held jointly by the Society of Petrophysicists and Well Log Analysts (SPWLA) and the submitting authors
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- 109 since 2007
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Cement evaluation results are commonly presented in a standard two-dimensional (2D depth and azimuth vs. bond) log format, whereas casing inspection results may include three-dimensional (3D depth and azimuth with projected radius vs. thickness) images. The incorporation of 3D images supporting cement evaluation provides an enhanced visualization-based interpretation capability and improved decision making. The incorporation time-based surveillance monitoring (4D) with current casing evaluation techniques provides pipe integrity inspection solutions to operators that expands capabilities beyond current industry norms.
Ultrasonic-based casing inspection and existing postprocessing software creates multiple images, curves, spreadsheets, and statistics designed to pinpoint areas of casing damage. In addition, high-resolution passes could be made to create 3D images of the casing geometry, including portions with damage. Applying the same 3D imaging technique to cement evaluation enables increased comprehension of the cement sheath characteristics, particularly extending away from the immediate casing wall-cement contact. An analysis method was developed to evaluate the behavior of standard cement bond log (CBL) refracted waveforms and is applied directionally to the multiple waveforms from the segmented bond tools. This process enables a detailed interpretation of the entire cement sheath between the casing and formation. It is possible to detect channels or problem areas in the annular space with this new process. Building on these processing results, it is possible to create 3D images, along with cross-sectional views, that enable easy visualization of the annular volume. The results of the processing and resulting images help to illuminate inferior cement sheaths that do not provide the desired zonal isolation and help to determine the reasons for the unwanted fluid production.
When managing riser inspection or monitoring casing wear, it is important to scrutinize changes in the pipe condition over time to meet governmental regulations. Visually comparing the logging runs is the standard legacy methodology, but this is extremely timeconsuming, particularly when comparing large amounts of data. This paper demonstrates a new technique to observe these alterations of the pipe conditions over time, both on a depth-by-depth and joint-by-joint basis. This new 4D surveillance interpretation method, accepted by the Bureau of Ocean Energy Management (BOEM), enables the operator to complete pipe inspections quickly and to continue drilling with confidence.
|File Size||4 MB||Number of Pages||22|