启动压力其实并不存在

THERE IS NOT A STARTING PRESSURE GRADIENT IN LOW-PERMEABILITY RESERVOIRS AT ALL

低渗透储层存在许多研究误区,启动压力梯度便是其一。低渗透储层孔隙欠发育,渗透率低,产能也较低,压力在其中的传播速度较慢,施以压力梯度之后,产量的响应需要较长时间。实验过程将微弱的流量误认为是0,因而导致了启动压力梯度的实验假象。实测的启动压力梯度数值太高,对油气生产没有任何指导意义。中高渗透储层没有启动压力梯度,低渗透储层也不应该有。固体和流体都不存在启动压力,油气也不可能存在。

There are many misunderstandings of low-permeability reservoirs,one of which is the starting pressure gradient for fluids to flow through.Pores are underdeveloped in low-permeability reservoirs,so permeability and productivity of low-permeability reservoirs are quite low,and pressure transits at quite low speed.While a pressure gradient is established in low-permeability reservoirs,the response of production needs a long time period.The weak flow rate from experiment in laboratory is misunderstood as zero,which results in the so-called'starting pressure gradient'phenomenon.The measured starting pressure gradients are usually too high to instruct the oil/gas production of low-permeability reservoirs.There are not starting pressure gradients for mid-and high-permeability reservoirs,so not for low-permeability reservoirs.There are not yielding shearing stresses for solids and liquids,so not for oil and gas.