论文部分内容阅读
根据一些油田的成功经验,地震振动是一种低成本提高原油采收率的方法。这种方法的主要难点在于其采油机理尚不清楚,因此,过程动态预测和可行性方案设计至今都无法实现。振动驱油方法的增产机理主要是利用了油藏的非均质性。将流体注入强非均质油藏的低渗储层中是非常困难的,而振动波却能有效地传播到高渗透层和低渗透层。当地震波在非均质油藏中传播时,不同渗透率地层的孔隙压力不同,产生瞬间压差和层间窜流,从而驱出低渗透储层中的原油。岩石的形变和流体流动方程都描述了低频振动孔隙的弹性形变对窜流的影响。事实上,地震振动改善了增产处理剂向低渗透储层(例如天然裂缝油藏的基质部分)的流动,从而从难以触及的致密基岩中采出更多的原油。
Based on the success of some fields, seismic vibrations are a way to increase oil recovery at a low cost. The main difficulty of this method is that the mechanism of its oil production is not yet clear, so the process of dynamic prediction and feasibility of the program design so far can not be achieved. Vibration and oil displacement method of increasing production is mainly the use of reservoir heterogeneity. It is very difficult to inject fluids into the low permeability reservoirs of strong heterogeneous reservoirs, while the vibrational waves can effectively propagate to the high permeability and low permeability reservoirs. When the seismic waves propagate in heterogeneous reservoirs, the pore pressures of different permeability strata are different, resulting in instantaneous pressure drop and interlayer channeling, thus driving out crude oil in low permeability reservoirs. Both rock deformation and fluid flow equations describe the effect of elastic deformation of low-frequency vibrating pores on channeling. In fact, seismic vibrations improve the flow of stimulation agent to low-permeability reservoirs, such as the matrix of natural fractured reservoirs, thereby producing more crude oil from inaccessible dense bedrock.