An investigation of WAG process using horizontal wells

A. Suat Bagci

    Research output: Contribution to journalArticle

    Abstract

    In this study, a comprehensive laboratory investigation was conducted for the recovery of heavy oil from a three-dimensional (3-D) physical model, packed with 18°API gravity crude oil, brine and crushed limestone. A total of 15 experiments were conducted using the 3-D physical model with 30 cm × 30 cm × 6 cm dimensions. Basically, water-alternating gas (WAG) process was used for recovering heavy oil. Three groups of well configurations were mainly used: (i) vertical injection and vertical production wells, (ii) vertical injection and horizontal production wells, and (iii) horizontal injection and horizontal production wells. Base experiments were run with water only and carbondioxide alone and optimum rates for WAG process were determined. In CO 2 injection experiments, vertical injection and horizontal production well configuration supplied a higher recovery (15.06% OOIP) than that of the others. Horizontal injection and horizontal production well configuration gave poor recovery with the same gas rate, while vertical injection and vertical production was better off with a lower gas rate. The volumetric ratio of the water and CO 2 slugs (WAG ratio) was varied 1:3 to 1:10 in order to determine optimum conditions. For water alternating gas injection case at a WAG ratio 1:7, vertical injection and vertical production well configuration gave the highest recovery (21.04% OOIP). Waterflooding reached the best recovery (37.20% OOIP) in vertical injection and vertical production well configuration. Oil production from WAG injection is higher than that obtained from the injection of continuous CO 2 or waterflooding alone.

    Original languageEnglish
    Pages (from-to)549-558
    Number of pages10
    JournalEnergy Sources, Part A: Recovery, Utilization and Environmental Effects
    Volume28
    Issue number6
    DOIs
    Publication statusPublished - 1 Mar 2006

    Keywords

    • CO 2 injection
    • CO 2 slug
    • Horizontal well
    • Water-alternating gas (WAG)
    • Waterflooding

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