Pressure transient and rate decline analysis for hydraulic fractured vertical wells with finite conductivity in shale gas reservoirs
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- 作者：Chaohua Guo ; Jianchun Xu ; Mingzhen Wei…
- 关键词：Shale gas ; Hydraulic fracturing ; Pressure transient analysis ; Rate decline analysis ; Adsorption coefficient
- 刊名：Journal of Petroleum Exploration and Production Technology
- 出版年：2015
- 出版时间：December 2015
- 年：2015
- 卷：5
- 期：4
- 页码：435-443
- 全文大小：819 KB
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Jianchun Xu (2)
Mingzhen Wei (1)
Ruizhong Jiang (2)
1. Department of Petroleum Engineering, Missouri University of Science and Technology, Rolla, MO, 65401, USA
2. Department of Petroleum Engineering, China University of Petroleum (Huadong), Qingdao, 266555, China - 刊物主题：Geology; Industrial and Production Engineering; Energy Technology; Offshore Engineering; Industrial Chemistry/Chemical Engineering; Environmental Monitoring/Analysis;
- 出版者：Springer Berlin Heidelberg
- ISSN：2190-0566
文摘
Producing gas from shale strata has become an increasingly important factor to secure energy over recent years for the considerable volume of natural gas stored. Unlike conventional gas reservoirs, gas transport in shale reservoirs is a complex process. In the organic nano pores, slippage effect, gas diffusion along the wall, viscous flow due to pressure gradient, and desorption from Kerogen coexist; while in the micro fractures, there exist viscous flow and slippage. Hydraulic fracturing is commonly used to enhance the recovery from these ultra-tight gas reservoirs. It is important to clearly understand the effect of known mechanisms on shale gas reservoir performance. This article presents the pressure transient analysis (PTA) and rate decline analysis (RDA) on the hydraulic fractured vertical wells with finite conductivity in shale gas reservoirs considering multiple flow mechanisms including desorption, diffusive flow, Darcy flow and stress sensitivity. The PTA and RDA models were established firstly. Then, the source function, Laplace transform, and the numerical discrete methods were employed to solve the mathematical model. At last the type curves were plotted and different flow regimes were identified. The sensitivity of adsorption coefficient, storage capacity ratio, inter-porosity flow coefficient, fracture conductivity, fracture skin factor, and stress sensitivity were analyzed. This work is important to understand the transient pressure and rate decline behaviors of hydraulic fractured vertical wells with finite conductivity in shale gas reservoirs. Keywords Shale gas Hydraulic fracturing Pressure transient analysis Rate decline analysis Adsorption coefficient