Optimization Design of CO2 Pre-Pad Energized Fracturing for Horizontal Wells in Shale Oil Reservoirs: A Case Study of the Ordos Basin

Yuxi Zang, Haizhu Wang, Hamid Ait Abderrahmane, Bin Wang, Tianyu Wang, Shouceng Tian, Sergey Stanchits, Alexey Cheremisin

    Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

    2 Scopus citations

    Abstract

    An improved recovery technique using carbon dioxide (CO2) pre-pad energized fracturing is presented to address the issue of low recovery in depleted development of shale reservoirs in the Ordos Basin. This study quantitatively evaluates the effect of CO2 pre-pad energized fracturing under different engineering and geological parameters. The geological model of the target block was created in GOHFER using field logging data from the Ordos Basin oilfield. By coupling the reservoir simulator CMG, a three-dimensional wellsitescale long horizontal mechanism model was established, considering the artificial hydraulic fracture model. The influence of engineering parameters and geological parameters on CO2 distribution was quantitatively evaluated. According to the outcomes of the simulation, the production potential of shale oil reservoirs can be significantly increased by using the CO2 pre-pad energized fracturing development method. Important engineering factors affecting the stimulation include the CO2 injection volume and soaking time, and the geological factors include the porosity, permeability, and layering. When the injection amount reaches a certain level, the growth of CO2 sweep area decreases. With the increase of immersion time, the CO2 sweep range gradually increases. Reservoir porosity and permeability affect CO2 sweep in the lateral direction. Considering the front slick water fracturing fractures, the impact on the CO2 sweep range is not apparent. Combined with GOHFER and CMG numerical simulation software, this study can realize the refined description of reservoirs considering artificial hydraulic fracture networks. According to the CO2 injection range, the effect of CO2 pre-pad energized fracturing under different engineering and geological conditions can be quantitatively evaluated. This study can be used as a reference CO2 pre-pad energized fracturing of shale oil reservoirs in the Ordos basin.

    Original languageBritish English
    Title of host publicationSociety of Petroleum Engineers - Gas and Oil Technology Showcase and Conference, GOTS 2023
    ISBN (Electronic)9781613999899
    DOIs
    StatePublished - 2023
    Event2023 Gas and Oil Technology Showcase and Conference, GOTS 2023 - Dubai, United Arab Emirates
    Duration: 13 Mar 202315 Mar 2023

    Publication series

    NameSociety of Petroleum Engineers - Gas and Oil Technology Showcase and Conference, GOTS 2023

    Conference

    Conference2023 Gas and Oil Technology Showcase and Conference, GOTS 2023
    Country/TerritoryUnited Arab Emirates
    CityDubai
    Period13/03/2315/03/23

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