ZHENG Li-ming, ZHANG Yang-yang, LI Zi-feng, et al. Analysis of seepage changes during poroelastic consolidation process with porosity and pressure variation under low-frequency vibration[J]. 2019, 40(3): 1158-1168.
ZHENG Li-ming, ZHANG Yang-yang, LI Zi-feng, et al. Analysis of seepage changes during poroelastic consolidation process with porosity and pressure variation under low-frequency vibration[J]. 2019, 40(3): 1158-1168.DOI: 10.16285/j.rsm.2017.0958.
The physical properties in actual developed reservoirs change under the stimulation of low-frequency vibration. However
no change in porosity and pressure is usually assumed in classic consolidation model. The analysis of solid deformation is often based on a one-dimensional physical model with constant pressure(or pressure gradient) condition. Therefore
it is usually inadequate to simulate the effect of seismic production technology near the wellbore in actual developing reservoirs
which are with varying flow velocities and pressure gradients
with the classic mathematic model and one-dimensional physical model. The control equations of consolidation model for low permeability porous media are re-derived from the continuity equations of fluid and solid. Considering different assumptions of variation extents of porosity and pressure
three consolidation models are given. Numerical simulation is then carried out with one-dimensional(with constant pressure gradient) or radial(with changing pressure gradient) physical model.The effect of seismic production technology as well as its sensitivity under different fluid and vibration parameters are evaluated with different consolidation models. Because of the influences of the inertia effect of initial flow and the strong stress sensitivity in low permeability reservoir
the increases of pressure
flow velocity
and porosity are found to be lower under vibration than the case without vibration in one-dimensional model. However
the wave-induced effect behaves differently in radial physical model. The increases of pressure and porosity are both higher under vibration than the case without vibration
and the increase of flow velocity becomes lower under vibration. As the vibration parameter increases
the volatility of values representing the wave-induced effect becomes stronger when simulated with radial physical model and different consolidation models. The results reflect that it is necessary to carry out a dynamic analysis on the complex effects of artificial seismic technology in actual developing reservoirs.