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Detecting anomalies in annular materials of single and dual casing string environments

An environment and detector technology, applied in the direction of analyzing materials, seismology for well logging, specific gravity measurement, etc., can solve problems such as failure to teach

Inactive Publication Date: 2019-12-06
菲利普蒂格 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this reference fails to teach a device or method to achieve this through the steel walls of single or multiple well casings

Method used

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  • Detecting anomalies in annular materials of single and dual casing string environments
  • Detecting anomalies in annular materials of single and dual casing string environments
  • Detecting anomalies in annular materials of single and dual casing string environments

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Embodiment Construction

[0033] This invention describes a method and device for determining the density of material surrounding the wellbore in a package that improves resolution and does not require direct physical contact with the well casing (ie, no liner). The invention described and claimed herein consists of a method and apparatus using a pseudo-conical x-ray beam for the purpose of detecting density variations within the annulus material surrounding a wellbore in a single or multi-column cased hole environment For purposes, the pseudo-conical x-ray beam is located within an unlined, concentrically positioned borehole logging tool.

[0034] The arrangement of the collimated detectors allows the collection of data relating in particular to the interaction region of known azimuthal and radial orientation (investigation depth of the azimuth distribution). As the tool moves axially within the wellbore, a three-dimensional map of the density of the annulus material around the wellbore can be produce...

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Abstract

The present invention provides an x-ray based cement evaluation tool for measurement of the density of material volumes within single, dual and multiple-casing wellbore environments, the tool including at least an internal length comprising a sonde section, wherein said sonde section further comprises an x-ray source; a radiation shield for radiation measuring detectors; sonde- dependent electronics; and a plurality of tool logic electronics and PSUs, wherein the tool uses x- rays to illuminate the formation surrounding a borehole and a plurality of detectors are used to directly measure the density of the cement annuli and any variations in density within. Detectors used to measure casing standoff such that other detector responses are compensated for tool stand-off and centralization; aplurality of reference detectors is used to monitor the output of the x-ray source, and a shortest-axial offset detector is configured to distribute incoming photons into energy classifications such that photoelectric measurements may be made.

Description

technical field [0001] The present invention generally relates to methods and means for detecting anomalies in annular material, and in particular but non-limiting embodiments, to annular material for detecting anomalies in single casing string environments and double casing string environments Exceptional methods and devices in . Background technique [0002] Within the oil and gas industry, the need to gauge the quality of cement passing through multiple casings is as paramount as the ability to determine the condition of the annulus. The industry currently employs various methods for verifying hydraulic seals behind a single casing string. Typically, ultrasonic tools are run in the well to determine whether cement is bound to the exterior of the casing, thereby indicating the presence of cement in the annulus between the casing and outer casing or between the casing and the formation. Ultimately, pressure testing is required to ensure zone isolation is achieved, as ultr...

Claims

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Application Information

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IPC IPC(8): G01V5/12
CPCG01N9/24G01V5/12G01N9/00G01V1/46G01V13/00H05G1/02G21K1/10
Inventor 菲利普·蒂格亚历克斯·斯图尔特
Owner 菲利普蒂格
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