低渗透油藏差异开发技术研究与实践 ——以济阳坳陷博兴洼陷为例

为提高低渗透油藏储量动用率和原油采收率,在总结博兴洼陷低渗透油藏研究成果及各种资料的基础上,依据低渗透油藏的地质特点和储层物性特征,通过理论研究和室内实验相结合的方式,研究了低渗透油藏的渗流机理,因不同渗透率级差低渗透储层流体渗流特征不同,将低渗透进一步细分为普通低渗透、特低渗透、超低渗透。对开发难度大的特低渗透、超低渗透油藏采取了常规注水开发、小井距注水开发、大型压裂弹性开发、气驱开发和长水平段水平井非常规开发等一系列差异开发技术,取得了明显的技术进展,并对这些技术在低渗透油藏开发的适用性进行了评价。研究认为,博兴洼陷低渗透油藏内的流体均具备一定的流动能力,通过差异开发技术改善渗流特征,可以实现有效动用。

Research and practice of differencial development technologies in low permeability oil reservoirs: case study of Boxing sag, Jiyang depression

In order to improve the reserve utilization and petroleum recovery of low permeability reservoir, we summarized the study results of Boxing low permeability reservoir and other related information; in the way of combining theoretical research and laboratory experiment, we studied percolation mechanism of the low permeability reservoirs. According to the corresponding percolation character of low permeability reservoir with different permeability grades, ordinary low permeability, extra low permeability and super low permeability are divided. For the extra low permeability and super low permeability reservoirs which are difficult to exploit, various differential development techniques such as normal water-injection, small well-distance water-injection, large-scale suppression with no waterinjection,gas-driving method and irregular method of long-distance level well exploitation were adopted, which have achieved promi? nent technical progress. We also evaluated the suitability of the technique used in low permeability development. We propose that the fluid in the low permeability reservoir is possessed with certain flowing ability, and all of the low permeability reservoirs could be exploited efficiently by using differential development technique to improve the percolation condition.