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我国低产油藏分布广泛,提高低产油藏的采油速度,对提高这类油藏开发的经济效益有很重要的现实意义。本文收集、分析了华北、大港、长庆及克拉玛依等油田六十多个采油速度较低油藏的地质特征和开发资料,研究了这类油藏采油速度低的原因和开发中存在的问题。并用两维两相黑油模型研究了注水时机、注水方式、井网密度、注采井网完善程度及生产压差诸因素对采油速度和开发效果的影响。并对一些低产油藏提出了提高采油速度,改善开发效果的措施。
The distribution of low-yielding reservoirs in our country is wide and the rate of oil recovery from low-yielding reservoirs is very important in improving the economic benefits of such reservoirs. This paper collected and analyzed the geological characteristics and development data of more than 60 oil recovery reservoirs in North China, Dagang, Changqing and Karamay, and studied the reasons for the low oil recovery rate and the problems in the development. The effects of water injection timing, water injection method, well density, well completion rate and production pressure difference on oil recovery rate and development effect were studied by two-dimensional two-phase black oil model. And some low-yielding reservoirs put forward measures to increase the oil recovery rate and improve the development effect.