Water coning mechanism in Tarim fractured sandstone gas reservoirs
来源期刊：中南大学学报(英文版)2015年第1期
论文作者：SHEN Wei-jun(沈伟军) LIU Xiao-hua(刘晓华) LI Xi-zhe(李熙喆) LU Jia-liang(陆家亮)
文章页码：344 - 349
Key words：water coning; fractured gas reservoir; water cut; recovery factor
Abstract: The problem of water coning into the Tarim fractured sandstone gas reservoirs becomes one of the major concerns in terms of productivity, increased operating costs and environmental effects. Water coning is a phenomenon caused by the imbalance between gravity and viscous forces around the completion interval. There are several controllable and uncontrollable parameters influencing this problem. In order to simulate the key parameters affecting the water coning phenomenon, a model was developed to represent a single well with an underlying aquifer using the fractured sandstone gas reservoir data of the A-Well in Dina gas fields. The parametric study was performed by varying six properties individually over a representative range. The results show that matrix permeability, well penetration (especially fracture permeability), vertical-to-horizontal permeability ratio, aquifer size and gas production rate have considerable effect on water coning in the fractured gas reservoirs. Thus, investigation of the effective parameters is necessary to understand the mechanism of water coning phenomenon. Simulation of the problem helps to optimize the conditions in which the breakthrough of water coning is delayed.
SHEN Wei-jun(沈伟军)1, 2, LIU Xiao-hua(刘晓华)3, LI Xi-zhe(李熙喆)3, LU Jia-liang(陆家亮)3
(1. Institute of Porous Flow and Fluid Mechanics, Chinese Academy of Sciences, Langfang 065007, China;
2. University of Chinese Academy of Sciences, Beijing 100190, China;
3. PetroChina Research Institute of Petroleum Exploration and Development-Langfang, Langfang 065007, China)
Abstract:The problem of water coning into the Tarim fractured sandstone gas reservoirs becomes one of the major concerns in terms of productivity, increased operating costs and environmental effects. Water coning is a phenomenon caused by the imbalance between gravity and viscous forces around the completion interval. There are several controllable and uncontrollable parameters influencing this problem. In order to simulate the key parameters affecting the water coning phenomenon, a model was developed to represent a single well with an underlying aquifer using the fractured sandstone gas reservoir data of the A-Well in Dina gas fields. The parametric study was performed by varying six properties individually over a representative range. The results show that matrix permeability, well penetration (especially fracture permeability), vertical-to-horizontal permeability ratio, aquifer size and gas production rate have considerable effect on water coning in the fractured gas reservoirs. Thus, investigation of the effective parameters is necessary to understand the mechanism of water coning phenomenon. Simulation of the problem helps to optimize the conditions in which the breakthrough of water coning is delayed.
Key words:water coning; fractured gas reservoir; water cut; recovery factor
