Identification of conductive fractures in perched formations with the use of a reformed packer test without well logging

Identification de fissures conductrices dans des formations perchées, en utilisant un essai avec un obturateur amélioré sans diagraphie de forage

Identificación de fracturas de conducción en formaciones colgadas con el uso de un ensayo de packer reforzado sin necesidad de registro en el pozo

改良封塞水力試驗設備探查低水位棲止岩層中的透水性裂隙之技術方法

Identificação de fraturas condutivas em formações suspensas com o uso de um teste de obturadores pneumáticos reformulado sem dados geofísicos de poço

A Correction to this article was published on 13 January 2021

This article has been updated

Abstract

A simple and efficient improvement on the conventional packer testing technique is described. Based on experience associated with hundreds of packer tests in the past decade, a functional change is proposed with respect to the pressure inflation supply for the packer testing unit. The change involves allowing each packer to be independently controlled with two separate gas-flow delivery systems, allowing for independent inflation and decompression underground. Four types of packer set-up are presented, which are able to be used alternately, according to specific environmental needs. It is believed that this is a small but important technical solution for packer testing failures, particularly as regards low water-level conditions in the well, regardless of whether this is a natural effect or a result of the drilling operation.

Résumé

Une amélioration simple et efficace d’une technique d’essai avec un obturateur conventionnel est. décrite. A partir de l’expérience associée à des centaines d’essais avec obturateur au cours de la décennie passée, une modification fonctionnelle est. proposée concernant la mise sous pression de l’unité d’essai avec obturateur. Le changement consiste à permettre à chaque obturateur d’être contrôlé de façon indépendante avec deux systèmes distincts de distribution de gaz, permettant de le gonfler et le décomprimer dans le milieu souterrain de manière indépendante. Quatre types de configuration d’obturateur sont présentés, lesquels pouvant être utilisés alternativement en fonction des exigences environnementales spécifiques. On estime que c’est. une petite mais importante solution technique pour les échecs lors d’essais avec obturateur, en particulier pour les conditions de bas niveau d’eau dans le forage, que ce soit lié à un effet naturel ou le résultat de l’opération de forage.

Resumen

Se describe una mejora simple y eficiente de la técnica de ensayo de packers convencionales. Se propone un cambio funcional con respecto al suministro de presión de inyección para la unidad de ensayo de packers en base a la experiencia asociada con cientos de ensayos realizados en la última década. El cambio implica permitir que cada packer sea controlado independientemente con dos sistemas de suministro de flujo de aire separados, permitiendo el aumento y descompresión independientes en el subsuelo. Se presentan cuatro tipos de configuración de packer, que pueden ser utilizados alternativamente según las necesidades ambientales específicas. Se considera que se trata de una solución técnica limitada, pero importante, para los defectos de las pruebas de los packers, en particular en lo que respecta a las condiciones de niveles bajos de agua en el pozo, independientemente de que se trate de un efecto natural o del resultado de la operación de perforación.

摘要

本文提出一項針對傳統封塞水力試驗設備的改良方法。根據過往經驗,我們認為封塞壓力充氣的方式應改良使氣流可獨立輸送,使得上下封塞可於地表下非同步性充氣和洩壓。本文因此討論了四種分離式封塞水力試驗設備的設置類型,可以根據特定的環境需求進行交替使用。本文所提出的技術方法是一個簡單但關鍵的技術解決方案,尤其可應用於井水位過低的情況。

Resumo

Uma melhoria simples e eficiente na técnica convencional de teste com obturadores pneumáticos é descrita. Com base na experiência associada a centenas de testes de obturadores pneumáticos na última década, propõe-se uma mudança funcional em relação ao fornecimento de pressão ao inflar o obturador pneumático. A mudança envolve permitir que cada obturador seja controlado independentemente com dois sistemas separados de fornecimento de fluxo de gás, permitindo inflação e descompressão subterrânea independente. São apresentados quatro tipos de configuração de obturadores pneumáticos, que podem ser utilizados alternadamente de acordo com necessidades ambientais específicas. Acredita-se que esta seja uma solução técnica pequena, mas importante para limitações de teste com obturadores pneumáticos, particularmente no que diz respeito às condições de baixo nível de água no poço, independentemente de se tratar de um efeito natural ou um resultado da operação de perfuração.

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Change history

  • 13 January 2021

    A Correction to this paper has been published: <ExternalRef><RefSource>https://doi.org/10.1007/s10040-020-02296-7</RefSource><RefTarget Address="10.1007/s10040-020-02296-7" TargetType="DOI"/></ExternalRef>

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Acknowledgements

The authors are grateful for the technical support of Mr. Chan-Peng Kang from Wilson Scientific.

Funding

Financial support comes from the Sinotech Engineering Consultants Inc., under the project grants RP-19903.

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Correspondence to Po-Yi Chou.

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Chou, PY., Wang, CT., Wu, NC. et al. Identification of conductive fractures in perched formations with the use of a reformed packer test without well logging. Hydrogeol J 28, 2275–2282 (2020). https://doi.org/10.1007/s10040-020-02170-6

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Keywords

  • Equipment/field techniques
  • Hydraulic testing
  • Conductive fractures
  • Perched water table