Rate Decline Analysis for Modeling Volume Fractured Well Production in Naturally Fractured Reservoirs

Mingxian Wang, Zifei Fan, Guoqiang Xing, Wenqi Zhao, Heng Song and Penghui Su
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Mingxian Wang: Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China
Zifei Fan: Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China
Guoqiang Xing: Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China
Wenqi Zhao: Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China
Heng Song: Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China
Penghui Su: Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China

Energies, 2018, vol. 11, issue 1, 1-21

Abstract: Based on the property discontinuity in the radial direction, this paper develops a new composite model to simulate the productivity of volume fractured wells in naturally fractured reservoirs. The analytical solution of this model is derived in detail and its accuracy is verified by the same model’s numerical solution. Detailed analyses of the traditional transient and cumulative rate are provided for the composite model. Results show that volume fracturing mainly contributes to the early-flow period’s production rate. As interregional diffusivity ratio increases or interregional conductivity ratio decreases, the transient rate at the same wellbore pressure increases. Three characteristic decline stages may be observed on transient rate curves and the shape of traditional rate curves in the middle- and late-flow periods depends on naturally fractured medium and boundary condition. By introducing a new pseudo-steady constant, new Blasingame type curves are also established and their features are more salient than those of traditional rate curves. Five typical flow regimes can be observed on these new type curves. Sensitivity analysis indicates that new Blasingame type curves for varied interregional diffusivity ratio, interregional conductivity ratio, interporosity coefficient and dimensionless reservoir radius, except storativity ratio, will normalize in the late-flow period.

Keywords: rate decline analysis; volume fractured wells; naturally fractured reservoirs; composite model; new Blasingame type curves; flow regime recognition (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View complete reference list from CitEc
Citations: View citations in EconPapers (5)

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