In this paper, by coupling the condition of production engineering to reservoir engineering, numerical simulation, fluid flow theory through porous media, numerical solution methods, considering triple medium of matrix, natural fracture and hydraulic fracture, a improved new fracturing reservoir simulation model was originally proposed for tight low permeable fractured gas reservoir through taking both low non-Darcy and high non-Darcy flow into account. The corresponding solution model was also developed, and solved on computer through programming. According to the results made by the fracturing reservoir software, which has taken a variety of aspects such as the direction and influence of in-situ stress, reservoir properties, natural fracture system and hydraulic fracture length into account and has been developed specifically in this study for tight low permeable fractured gas reservoir, the fracturing reservoir plan of Xin Chang gas field has been worked out. It has proved that the simulation software can work as a powerful tool to design fracturing reservoir plan for tight low permeable fractured gas reservoir.
In order to narrow the gap between investment and returns, and keep stable production duration longer and recovery reasonable, the fracturing reservoir technique is widely used in gas and oil fields to maximize the economic results. The key point of fracturing reservoir how to forecast the best well net or post- fracturing production performance, which can provide reliable data for adjustment plan of gas and oil fields. Within tight low permeable fractured gas reservoir, on one hand the fluid has to overcome the minimum pressure gradient to flow, which is characterized by low non-Darcy flow; on the other hand, the gas velocity is very high in hydraulic fracture, which usually characterized by high non-Darcy flow. In this study, a improved new fracturing reservoir mathematics model was originally proposed for tight low permeable fractured gas reservoir through taking both low non-Darcy and high non-Darcy flow into account.
Based on successful numerical simulation in fractured reservoir, considering triple medium of matrix, natural fracture and hydraulic fracture, the Fracturing reservoir simulation model of three dimensional(3D) two phase (water and gas) triple medium for tight clastic gas reservoir has been developed. In which the influence of low non-Darcy velocity and high non-Darcy velocity on fluid flow in tight low permeable fractured gas reservoir was originally studied at length.
The model includes,
1.1.1 Basic Flow Equation
Equation (1) (Available in full paper)
Equation (2) (Available in full paper)
Equation (3) (Available in full paper)
Equation (4) (Available in full paper)
Equation (5) (Available in full paper)
1.4.1 Basic Assumptions
1. There exist water and gas in the reservoir, and the two phases don't solve each other. The reservoir temperature is constant.
