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Artificial fractured wells producing dynamic simulation study

Author: ZhengXianBao
Tutor: LiuZhenYu；LiLi
School: Daqing Petroleum Institute
Course: Oil and Gas Field Development Project
Keywords: Finite Element Method Low permeability reservoir Numerical Simulator Artificial fractures Dynamic Production
CLC: TE319
Type: Master's thesis
Year: 2006
Downloads: 473
Quote: 9
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Abstract


Current artificial fractures especially complex dynamics of the production of crack-related parameters on the production dynamics of research is not deep, due to limitations of research methods and did not crack a more realistic and reasonable description. Therefore, in this regard the need for in-depth study. Used to study the numerical solution of reservoir seepage problem is mainly finite difference method, and finite element method as an efficient numerical solution compared with the finite difference method has many advantages, but, in reservoir seepage research is not yet depth. In this paper, the basic principles of the finite element method, based on the combination of low permeability reservoir percolation characteristics, a more systematic study of the finite element method in low permeability reservoirs on the application of principles and methods for finite element analysis of some of the important factors affecting the in-depth discussion, focusing on the dynamics of the production of artificial fracture parameters on the production dynamics of in-depth study, to be more realistic and reasonable description. The basic theory of finite element seepage basic differential equation derived from a single-phase fluid flow, oil - water two-phase flow finite element equation. Anchor model is introduced for the first time to calculate the seepage problem which simulate cracks; and using reaction force algorithm flow. On this basis, the use of Fortran language of the finite element method reservoir simulator, using isoparametric element for spatially discrete flow equation, using the backward difference in time discrete, linear equations with variable bandwidth of Gaussian elimination The method makes full use banded stiffness matrix and its symmetry characteristics, which greatly reduces the required storage space. Programming process using elements of the program design ideas, so that the whole program structure clear, optimize compact, easy to maintain, and operational efficiency. Finite element analysis on the impact of important parameters related (eg, mesh size, mesh ratio, time step, etc.) conducted in-depth study and discussion, for the right to carry out finite element calculation provides an important basis; based on model validation on, respectively, using the simulator on fracture half-length, conductivity effects on the production capacity of the simulation study, draw meaningful conclusions. On the basis of the complex and irregular fractured wells fractured wells were exploratory study, preliminary results show that the calculated results are reasonable. Also select a block of an oilfield block simulation study conducted showed that the simulator can not only simulate a single well, you can also block the production dynamics simulation study. For oil and water two-phase flow simulation results and problems of in-depth discussions for further research work has laid a solid foundation.

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CLC: > Industrial Technology > Oil and gas industry > Oil and gas development and mining > Basic theory > Simulation theory and computer technology in the development
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