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Abstract

Summary

Unconventional gas resources from tight and shale gas reservoirs have received great attention in the past decade and become the focus of petroleum industry. In order to improve gas production, significant efforts have been made to understand the geological and hydro-dynamical nature of organic shale formations, and to develop numerical simulation tools for quantitative studies of unconventional reservoir dynamics and performances.

Shale gas reservoirs have specific characteristics, such as tight reservoir rock with nano-Darcy permeability. Additionally, hydraulic fracturing is required in such reservoirs to create very complex fracture networks to connect a huge reservoir area to the wellbore effectively. We should consider the flow behavior in a stimulated reservoir volume (SRV) including extremely-low permeability tight matrix and multi-scale fracture networks, namely primary hydraulic fractures, induced secondary fractures, propped and un-propped natural fractures.

In this paper, we will study simulation techniques to simulate water invasion during hydraulic fracturing and its impact on the gas production. A huge amount of water (thousands cubic meters) are injected to create multi-stage hydraulic fractures, and only a part of them (30–60%) are reproduced during a long production period. Unproduced water near the fractures causes formation damage, due to chemical adsorption/retention, capillary trapping, etc., and affects the gas mobility.

To simulate correctly fracturing fluid invasion and its backflow, fluid transport should be considered in both multi-scale fractures and tight matrix formation with very fine grid blocks for fracture-matrix interaction simulations. A single-porosity model is usually not suitable for this kind of problem, because a large number gridblocks are required to simulate the fracture network and fracture-matrix interaction. A standard dual-porosity model is not suitable neither, because of large block sizes and long transient duration with ultra-low matrix permeability. In this paper, we study the MINC (Multiple INteracting Continuum) method and use a hybrid approach to simulate the gas production under hydraulic fracturing. Satisfactory results are obtained.

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/content/papers/10.3997/2214-4609.20141884
2014-09-08
2024-04-25

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Simulation of Fracturing Water Invasion and its Impact on Gas Production in Shale-gas Reservoirs
Conference Proceedings 2014, 1 (2014); https://doi.org/10.3997/2214-4609.20141884
/content/papers/10.3997/2214-4609.20141884
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