Experimental investigation of heavy oil recovery from fractured reservoirs by secondary steam - Gas assisted gravity drainage

A. Mohsenzadeh, M. Escrochi, M. V. Afraz, Yahya Al-Wahaibi, Shahab Ayatollahi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Citations (Scopus)

Abstract

In this study, gas-oil gravity drainage process and steam-gas assisted gravity drainage processes for heavy oil recovery from fractured models were investigated experimentally. For each test, six oil- wet saturated outcrop cores, 8.7 cm in diameter and 15 cm length, were stacked in a long core holder. In the first step, gas injection was started into the model at reservoir condition that results in oil production under gas-oil gravity drainage mechanism. In the second round of tests when no more oil was produced by gas injection, the tests were continued using steam-gas assisted gravity drainage process. In this stage, gas was injected together with specific steam/gas ratio at saturated temperature condition. In the course of experiments, oil and water productions, pressure and temperatures of system were monitored carefully. The experiments were performed using three different combination of gases consist of pure CO 2, pure N 2 and mixture of 15 % CO 2 and 85% N 2 as synthetic flue gas. The results showed that after gas breakthrough and fracture depletion, the ultimate oil recovery for CO 2 injection was 58.4 % (14.8% for gas injection and 43.6 % for steam-gas co-injection), in the case of flue gas injection, it was 73.8 % (9.8 % for gas injection and 64% for steam-gas co-injection) and for N 2 injection was 47% (13.5 % for gas injection and 33.5% for steam-gas co-injection). The results indicate the high performance of flue gas injection for heavy oil recovery from fractured reservoirs during gas-oil gravity drainage and steam-gas assisted gravity drainage processes.

Original languageEnglish
Title of host publicationSociety of Petroleum Engineers - SPE Heavy Oil Conference Canada 2012
Pages395-412
Number of pages18
Volume1
Publication statusPublished - 2012
EventSPE Heavy Oil Conference Canada 2012 - Calgary, AB, Canada
Duration: Jun 12 2012Jun 14 2012

Other

OtherSPE Heavy Oil Conference Canada 2012
CountryCanada
CityCalgary, AB
Period6/12/126/14/12

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Energy Engineering and Power Technology

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    Mohsenzadeh, A., Escrochi, M., Afraz, M. V., Al-Wahaibi, Y., & Ayatollahi, S. (2012). Experimental investigation of heavy oil recovery from fractured reservoirs by secondary steam - Gas assisted gravity drainage. In Society of Petroleum Engineers - SPE Heavy Oil Conference Canada 2012 (Vol. 1, pp. 395-412)