Novel dual-tubing technique to eliminate the shut-in period in CO2 huff-n-puff injection for heavy oil carbonate reservoirs

Zakaria Hamdi, Nirmal Mohanadas, Margarita Lilaysromant, Oluwole Talabi

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

Abstract

Some heavy oil production can be established using conventional methods; however, these methods are often somewhat ineffective with low recovery factors of less than 20%. Carbon dioxide (CO2) huff-n-puff or cyclic CO2 injection is one of the Enhanced oil recovery (EOR) methods that can be used in stimulating aging wells to recover some residual oil. The shut-in stage of this method results in a significant delay in the production time, and hence lower oil recovery. For the first time, in this paper, an attempt is made to overcome this issue by a novel approach, employing dual tubing completions. The aim of this is to increase the oil recovery with the production during soak time. Also, a majority of the remaining heavy oil reservoirs are carbonates, hence the research was focused on the same conditions. Numerical simulation is done using dual-tubing conditions in a dual-porosity model with conventional tubing as a base case. Optimization studies are done for injection rate, injection time, soaking time, production time, and huff-n-puff cycles. The results show that the recovery factor can increase significantly, with no discontinuity in production. Preliminary economic studies for the cases also showed a net increase in profit of 7% (1.3 million Dollars for the case chosen). This demonstrates the feasibility of the proposed method which can be implemented into conventional operations, for a more sustainable economy in the era of low oil prices.

Original languageEnglish
Title of host publicationIADC/SPE Asia Pacific Drilling Technology Conference 2021
PublisherSociety of Petroleum Engineers
ISBN (Electronic)9781613997116
DOIs
Publication statusPublished - 4 Jun 2021
EventIADC/SPE Asia Pacific Drilling Technology Conference 2021 - Virtual, Online
Duration: 8 Jun 20219 Jun 2021

Conference

ConferenceIADC/SPE Asia Pacific Drilling Technology Conference 2021
Abbreviated titleAPDT 2021
CityVirtual, Online
Period8/06/219/06/21

ASJC Scopus subject areas

  • Energy Engineering and Power Technology

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