The effect of supercritical CO2 fracturing fluid retention-induced permeability alteration of tight oil reservoir

Caili Dai, Xin Sun, Yongpeng Sun, Mingwei Zhao, Mingyong Du, Chenwei Zou, Baoshan Guan

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

Supercritical CO2 (SC-CO2), as a non-aqueous material of fracturing fluid, receives widely attention in the development of unconventional reservoirs. In this study, permeability regain (Krg) was introduced to characterize the permeability alteration on tight cores by SC-CO2 fracturing fluid. Meanwhile, scanning electron microscope (SEM), microscope system, nuclear magnetic resonance (NMR) were used to reveal the mechanisms of permeability alteration at different scales. The results showed that the composition of SC-CO2 fracturing fluid, fluid filter loss, and reservoir permeability were all responsible for permeability alteration. With the increasing thickener contents and filter loss of fracturing fluid, core permeability regains turned to be declined. Comparatively, tight cores which consist of more micro-nanometer sized pores were more likely to receive more formation damage of permeability, as well. The retention of thickener in microchannels (micro pores) were confirmed to be the main mechanisms on permeability alteration.

Original languageEnglish
Pages (from-to)1123-1132
Number of pages10
JournalJournal of Petroleum Science and Engineering
Volume171
DOIs
Publication statusPublished - 1 Dec 2018

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