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Novel Geophone Array Measures Exact Location of Fluid Movement Behind Casing

Historically, acoustic wellbore monitoring is among the primary methods of detecting fluid movement behind the casing. However, analysis of the complex acoustic environment in the wellbore can be challenging. A standard hydrophone noise tool is unable to measure flow directions (vertical and horizontal) and cannot detect low flow, low-pressure sporadic events, or multiple sources. The complete paper discusses a geophone array, including four, three-component geophones deployed by wireline, that provides a solution for this problem by creating a 3D map of the acoustic environment.

Introduction

Well-integrity issues such as a poor cement bond can lead to undesirable fluid movements behind the casing, which could have negative effects with regard to health, safety, and the environment. A detailed understanding of annular fluid movement is critical in identifying potential source locations for wells with surface-casing vent-flow (SCVF) issues. Applicable scenarios include the following:

  • Planned well-intervention activities for wells with multiple-source vent/flow situations
  • Confirming the presence of flow (gas/oil/water) behind the casing
  • Identifying areas with suspected crossflow between zones
  • Integrity confirmation for gas storage caverns or zones
  • Identifying unwanted flow for well-abandonment activities
This article, written by JPT Technology Editor Judy Feder, contains highlights of paper SPE 197560, “Enhanced Well Remedial Decisions From Exact Location of Fluid Movement Behind Casing Identification,” by Marcel Croon, SPE, Perry Huber, SPE, and Jacob Wright, SPE, Weatherford, SPE, prepared for the 2019 Abu Dhabi International Petroleum Exhibition and Conference, Abu Dhabi, 11–14 November. The paper has not been peer reviewed.
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Novel Geophone Array Measures Exact Location of Fluid Movement Behind Casing

01 January 2021

Volume: 73 | Issue: 1

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