Numerical Simulation of One-Hole Multi-Target Staged Fracturing in Fractured-Vuggy Reservoirs

doi:10.7657/XJPG20230610

Abstract

Abstract:

Based on the discrete fractured-vuggy reservoir model, an oil-water two-phase flow model and a numerical simulation method considering matrix-fracture flow and vug free flow were established to analyze the performance of one-hole multi-target staged fracturing in fractured-vuggy reservoirs, and the impacts of natural fracture development degree, bottom water, and number of fracturing clusters on the fracturing performance were identified. The results show that, in the absence of bottom water, the natural fracture development degree only affects production rate but has a minor impact on the ultimate oil recovery; and in the presence of bottom water, the bottom water rising along natural fractures displaces the crude oil in cavities, leading to an increase in oil production with the increase of natural fracture density. Vug size and hydraulic fractures significantly affect the productivity of fractured-vuggy reservoirs. When natural fractures are highly developed, the difference between the performance of fracturing by single cluster in one stage and by multiple clusters in one stage decreases significantly, indicating that a single cluster hydraulic fracture can effectively control the entire sweet spot area in the fractured-vuggy reservoir.

Key words: fractured-vuggy reservoir, one-hole multi-target, staged fracturing, numerical simulation, natural fracture, discrete fracture, vug free flow, fracturing design

CLC Number:

TE344

GENG Yudi, LIU Lijun, WANG Lijing, GUO Tiankui. Numerical Simulation of One-Hole Multi-Target Staged Fracturing in Fractured-Vuggy Reservoirs[J]. Xinjiang Petroleum Geology, 2023, 44(6): 711-719.

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