中国石化低渗透油藏开发状况及前景

The development situation and future of low permeability oil reservoirs of SINOPEC

选择渗透率、油藏原始压力和油藏埋藏深度3个指标,结合中国石化已开发的286个低渗透油藏开发单元特点,将低渗透油藏细分并组合为深层高压特低渗透油藏、中深层常压特低渗透油藏、浅层低压特低渗透油藏、深层高压低渗透油藏、中深层常压低渗透油藏和浅层常压低渗透油藏6种主要类型,不同类型油藏开采特征差异较大。提出了加强储层和渗流机理研究、合理加密井网、实施精细注水、应用整体压裂改造和井筒提升技术、实施二氧化碳驱和天然气驱先导试验等改善低渗透油藏开发状况的思路,指出下一步应利用水平井和分支水平井开采各种类型低渗透油藏,提高油藏开发经济效益,开拓中国石化乃至中国低渗透油藏开发前景。

After analyzing the characteristics of 286 developed low permeability oil reservoirs belong to SINOPEC,three indices,including permeability,formation pressure and burial depths,are selected to classify the low permeability oil reservoirs into six types,which are deep-high pressure-extra low permeability oil reservoirs,mid-depth-normal pressure-extra-low permeability oil reservoirs,shallow-low pressure-extra low permeability oil reservoirs,deep-high pressure-low permeability reservoirs,mid-depth-normal pressure-low permeability reservoirs and shallow-normal pressure-low permeability oil reservoirs.The production characteristics are different for different types of oil reservoirs.The ideas of improving development condition of the low permeability oil reservoirs are proposed,such as strengthening the research of low permeability reservoirs and flow mechanism,reasonable infilling the well patterns,implementing fine water flooding,integrated fracturing and shaft hoisting,implementing pilot tests of the carbon dioxide drive and natural gas drive,etc.It points out that horizontal wells and multilateral wells should be applied to exploit all types of low permeability oil reservoirs in the future in order to enhance economic effects and bring about a bright future for all low permeability oil reservoirs of SINOPEC or even whole China.