CAJ | 학술논문

应力敏感对储层的损害具有不可逆性,启动压力梯度导致油藏中出现不流动区；因此,界定海上低渗透油藏非线性渗流的渗透率下限对制定高效开发技术政策至关重要。分别选取珠江口盆地东部10块和17块典型低渗透岩芯开展应力敏感实验和启动压力梯度实验研究。通过实验结果分析,分别建立了应力敏感、启动压力梯度与油藏岩石渗透率的关系模型,定量表征了海上低渗透油藏非线性渗流特征。选用油藏实际参数,模拟计算应力敏感和启动压力梯度对产能的影响,界定了珠江口盆地东部低渗透油藏应力敏感渗透率下限为10×10-3μm2,启动压力梯度下限38×10-3μm2,以此指导南海东部低渗透油藏合理开发技术政策制定,从而为提高油田开发效果奠定了基础。
응력민감대저층적손해구유불가역성,계동압력제도도치유장중출현불류동구；인차,계정해상저삼투유장비선성삼류적삼투솔하한대제정고효개발기술정책지관중요。분별선취주강구분지동부10괴화17괴전형저삼투암심개전응력민감실험화계동압력제도실험연구。통과실험결과분석,분별건립료응력민감、계동압력제도여유장암석삼투솔적관계모형,정량표정료해상저삼투유장비선성삼류특정。선용유장실제삼수,모의계산응력민감화계동압력제도대산능적영향,계정료주강구분지동부저삼투유장응력민감삼투솔하한위10×10-3μm2,계동압력제도하한38×10-3μm2,이차지도남해동부저삼투유장합리개발기술정책제정,종이위제고유전개발효과전정료기출。
The loss of stress sensitivity is irreversible, at the same time starting pressure gradient leads into the static fluid in the reservoir. So it is very important to get the lower limit standard of permeability of nonlinear flow in the offshore low permeability reservoir. It chooses eastern Pearl River Estuary basin 10 piece low permeability cores to conduct experimental research on stress sensitivity and 17 pieces cores to conduct starting pressure gradient of low permeability reservoir offshore. On the basis of analysis of experimental result, it builds the relationship between stress sensitivity, starting pressure gradient and rock permeability and characterize offshore reservoir nonlinear flow. On the basis of this, practical reservoir data calculate the product well production under stress sensitivity and start-ing pressure gradient was used. The low standard of stress sensitivity is 10 × 10 -3μm2 and the low standard of start-ing pressure gradient is 38 × 10 -3μm2. It conducts the development strategy formulation and laid the foundation for promoting reservoir development in the low permeability reservoir of eastern Pearl River Estuary basin.