大庆石油地质与开发2012，Vol.31Issue(6)：73-78,6.DOI:10.3969/J.ISSN.1000-3754.2012.06.015
特低渗透纵向非均质储层渗流特征研究新方法
A NEW RESEARCH METHOD ON THE SEEPAGE CHARACTERISTICS IN ULTRA-LOW-PERMEABILITY RESERVOIRS WITH VERTICAL HETEROGENEITY
摘要
Abstract
The reservoirs in Daqing peripheral oilfield are characterized not only by thin thickness, small-narrow sandbody and ultra-low permeability, but also by strong vertical heterogeneity and serious interlayer interference in the course of waterflooding. It is very necessary to clearly recognize the flow laws'influences of the heterogeneity on the effective development of this kind of oil reservoirs. With the help of oil-reservoir numerical simulation and the nonlinear flow laws of the fluids in the ultra-low permeability reservoirs, the positive-rhythm vertical heterogeneous mathmetical model is established based on the geological features of the block. Permeability correcting factors are introduced to modify the ultra-low permeabilities, five-point well pattern is adopted to conduct numerical Simulation, and moreover the comparison is made with the conventional model of Darcy flow. The simulation results show that the nonlinear flow laws further intensify the vertical heterogeneity of the reservoirs. The water absorption capacity of relatively higher permeability reservoirs is increased, while that of relatively lower permeability ones is just on the contrary; under the condition of nonlinear flow laws, the water injection pressure rises high, the acceleration speed of the water cut is propelled, the overall developed effects of the block is poor than those in the laws of Darcy flow. The distribution of permeability correcting factors in the relatively low permeability reservoirs ranges from 0. 2 to 0. 4, the developed degree is rather low; while that in the relatively high permeability ones distributes from 0. 6 to 0. 8, signifying greatly higher developed degree. In the reservoirs with vertical heterogeneity, the capillary force can mitigate the heterogeneous water-intake rates among the reservoirs, so proper reducing the water injection speed can not only decrease the injection pressure, but also relieve the interlayered contradiction of water absorption, thus the developed effects can fully improved.关键词
特低渗透/纵向非均质/非线性渗流/数值模拟/毛管力Key words
ultra-low permeability/ vertical heterogeneity/ nonlinear flow/ numerical simulation/ capillary force分类
能源科技引用本文复制引用
崔茂蕾,郝明祥,于荣泽,杨正明..特低渗透纵向非均质储层渗流特征研究新方法[J].大庆石油地质与开发,2012,31(6):73-78,6.基金项目
国家油气重大专项"特低渗透油藏有效开发技术"(2011ZX05013-005)资助. （2011ZX05013-005）
