石油钻采工艺2017，Vol.39Issue(2)：130-137,8.DOI:10.13639/j.odpt.2017.02.002
特低渗透油藏CO2非混相驱井距与产量关系理论模型
Theoretical model for relationship between well spacing and oil production by CO2 immiscible flooding in the extra-low permeable reservoir
摘要
Abstract
Establishment of well spacing model according to the anticipate d oil production has important significance to determine reasonable well spacing density. Based on non-linear seepage theory of extra-low permeable reservoir, consideringthe effect of CO2 to reduce oil viscosity and the oil phase starting pressure gradient change, one-dimensional mathematical model for the seepage by CO2 immiscible flooding was established. By the application of Buckley-Leverett displacement theory and seepage theory, the theoretical model for the relationship between well spacing and oil production by CO2 immiscible flooding in the extra-low permeable reservoir was built and the well spacing calculation software was developed for the example calculation and theoretical chart drawing. The results show that the well spacing is maximum with consideration of both viscosity and starting pressure gradient changes of the oil phase. In the early stage of displacement, the oil phase starting pressure gradient has significant effect on the well spacing while oil phase viscos-ity has small effect on the well spacing. In the later stage of the displacement, the effect of the oil phase viscosity on the well spacing has gradually become stronger. Well spacing becomes smaller with the increase of the anticipated production. The less the anticipated production becomes, the faster the well spacing increases. The well spacing becomes smaller with the increase of the initial viscosity of the formation oil and initial starting pressure gradient of the oil phase.Moreover, the theoretical model for the relationship between well spacing and oil production has offered a rapid calculation method for the well spacing calculation on the basis of anticipated production and provides the criteria for the well network deployment in oilfield.关键词
特低渗透油藏/非混相驱/启动压力梯度/产量/井距Key words
extra-low permeable reservoirs/immiscible flooding/starting pressure gradient/production/well spacing分类
能源科技引用本文复制引用
迟杰,鞠斌山,吕广忠,汪佳蓓,房平亮..特低渗透油藏CO2非混相驱井距与产量关系理论模型[J].石油钻采工艺,2017,39(2):130-137,8.基金项目
国家科技重大专项"大型油气田及煤层气开发"(编号:2011ZX05009-006)资助. （编号:2011ZX05009-006）
