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Abstract

Progress in Petrochemical Science

Mechanism of Particle Migration and Damage of Permian Igneous Rocks Reservoir in Sichuan Basin

  • Open or CloseJie S1, Weian H1,2*, Weihua C3, Xiaojie L4, Rong Z3, Dandan Z3 and Rui W1

    1School of Petroleum Engineering, China University of Petroleum (East China)

    2China Key Laboratory of Unconventional Oil & Gas Development, China University of Petroleum (East China), China

    3Engineering Technology Research Institute of Petrochina Southwest Oil and Gas Field Company, China

    4Drilling Fluid Branch of Western Drilling Engineering Company, China

    *Corresponding author:Weian H, China Key Laboratory of Unconventional Oil & Gas Development, China University of Petroleum (East China), China

Submission: January 27, 2021 Published: February 16, 2021

DOI: 10.31031/PPS.2021.04.000579

ISSN 2637-8035
Volume4 Issue1

Abstract

There is little research on the damage mechanism of igneous rocks reservoir in the domestic and overseas. It is of great significance to clarify the potential damage factors of particle migration of igneous rock, and to illustrate the damage degree and damage mechanism of this kind of special reservoir. The experimental results of microstructural observations and mineral analysis of natural and outcrop igneous rocks in laboratory studies showed that the mineral composition and microstructure of natural and outcrop igneous rocks were similar, and microscale or nanoscale dissolution fractures are mainly developed. However, the physical properties of outcrop cores are slightly worse than those of natural cores, the average porosity of natural cores and outcrop cores were about 20% and 2.79%, respectively. In the experimental results of nuclear magnetic resonance on-line monitoring, the start-up gas flow rate of natural core was 4mL/min. With the increasing of floe rate, the proportion of micro-pores in natural cores decreased and the proportion of macro-pores increased, the changes of mesoporous were not obvious. The results of core flow plugging experiment showed that the large particles could not all enter the core throat and would form plugging at the core edge, while most of the nanoscale particles can enter the core leading to the permeability damage of 68.5%. Through the CT scanning experiments, it was found that the proportion of pore space in the middle of the core was reduced by 56.1% when the nanoscale particles were driven into the core, the particle plugging was obvious. Hence, there are immense exploration prospects of the damage mechanisms for igneous rocks reservoir in the process of particle migration.

Keywords: Igneous rock; Particle migration; Damage mechanism; Nuclear magnetic resonance; CT scanning

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