Study on the Production Decline Laws for Vertical Fracture Well in Low-Permeability Gas Reservoirs

Abstract:

The vertical fracture was asymmetrical about the wellbore or two wings of a fracture are not certainly in a line for the complex geo-stress in the possession of fracturing of the gas reservoirs. In view of the low permeability reservoir after fracturing developing the asymmetrical vertical fracture and non-coplanar fractures, based on the non-steady seepage theory, using the potential function theory, superimposition principle and numerical analysis method, a performance prediction model for the vertical fracture in low-permeability gas reservoirs was deduced with pressure drop superposition principle. The production decline laws were analyzed by practical cases. The result shows that the initial production of the vertical fracture is relatively high but soon followed by a sharp decline. Then, the production keeps in a relatively stable state and declines slowly in the middle and later. The fracture asymmetry factor has little effect on the gas well productivity. The non-coplanar angles have greater effect on the oil well productivity in the initial stage. The more the fracture length and the bigger the flow conductivity, the higher the oil well production and the faster the decline rate will be. However, the increase amplitude will be getting smaller and smaller along with the fracture length and flow conductivity.

• Periodical: Applied Mechanics and Materials (Volume 527)
• Pages: 81-87
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.527.81
• Online since: February 2014
• Authors: Yi Ning Wang*, Xiao Dong Wu, Rui He Wang, Feng Peng Lai, Bei Lin Qi, Zhuang Zhang
• Keywords: Decline Laws, Fracture Asymmetry Factor, Low-Permeability Gas Reservoir, Non-Coplanar Angle, Non-Steady Seepage, Vertical Fracture

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