摘要
岩石压敏性是导致低渗油藏开发效果变差的主要因素之一,为了研究储层物性对低渗储层压敏性的影响,通过室内模拟试验,研究了渗透率、非均质性和裂缝对岩石压敏性的影响。结果表明,渗透率越低,压力敏感性越强,且渗透率损失主要发生在有效压力增大的初始阶段。非均质岩心的压敏性介于单一高、低渗层之间,其压敏性试验结果强于并联岩心的压敏性。裂缝性油藏的渗透率损失远大于基质油藏,其损失程度与裂缝性岩心中基质部分的渗透率有关。基质部分渗透率越小,裂缝性岩心渗透率损失越大;反之,其渗透率损失越小。
The rock pressure sensitivity was one of the major factors inducing poor effect in low permeability reservoirs,to study the effect of reservoir physical property on the pressure sensitivity in low permeability reservoirs,the effects of permeability,heterogeneity and fractures on the rock pressure sensitivity were studied through laboratory simulation.The results show that the lower the permeability is,the stronger the sensitivity is,and permeability loss is mainly at the initial stage of an effective pressure increase.The permeability of heterogeneous rock sample is between single layer with high or low permeability,its test result of pressure sensitivity is stronger than that of a parallel rock sample.The permeability loss in fractured reservoir is more greater than that in matrix reservoir,its loss degree is related to the permeability of meddle-level matrix in fractured cores.The lower the permeability of matrix is,the bigger the loss of permeability in fractured cores is,conversely,the loss is smaller.
出处
《石油天然气学报》
CAS
CSCD
2013年第3期118-121,167,共4页
Journal of Oil and Gas Technology
关键词
低渗透油藏
渗透率
非均质性
裂缝
压敏性
low permeability reservoir
permeability
heterogeneity
fracture
pressure sensitivity
