缝网压裂裂缝形态对低渗油藏渗吸采油效果影响实验

发布时间：2018-02-27 14:23

本文关键词： 大庆油田低渗油藏缝网压裂渗吸采油物理模拟机理分析　出处：《大庆石油地质与开发》2017年04期 　论文类型：期刊论文

【摘要】：大庆油田外围地区低渗油藏储量非常丰富,但由于缺乏有效的开发手段,采出程度比较低。渗吸采油是(弱)亲水低渗油藏有效开发的技术措施之一。以大庆外围扶余储层流体性质和地质特征为模拟对象,在仿真模型上开展缝网压裂裂缝长度和条数对渗吸采油效果影响实验。研究结果表明:随缝网压裂裂缝主缝长度和分支缝数量增加,渗吸面积增加,油水交渗作用增强,渗吸采收率增加,但增幅逐渐减小;"渗吸液+增能剂"组合使用能够产生原油降黏、补充驱替动力和油水交渗等3因素间协同效应,可以大幅度提高渗吸采油效果,采收率增幅超过15%。
[Abstract]:The low permeability reservoirs in the peripheral areas of Daqing Oilfield are very rich in reserves, but due to the lack of effective development means, The recovery degree is relatively low. Permeability and oil recovery is one of the technical measures for effective development of (weak) hydrophilic and low permeability reservoirs. The fluid properties and geological characteristics of Fuyu reservoir in the periphery of Daqing are taken as the simulation objects. An experiment on the effect of fracture length and number of fractures on oil absorption and recovery is carried out on the simulation model. The results show that with the increase of fracture length and number of branch fractures, the permeability area increases, and the effect of oil and water cross permeability increases. The combined use of "osmotic liquid energy enhancer" can produce the synergistic effect among three factors, such as reducing viscosity of crude oil, supplementing displacement power and oil-water permeation, which can greatly improve the effect of oil absorption and oil recovery. The increase in oil recovery is more than 15%.
【作者单位】：东北石油大学提高油气采收率重点实验室;大庆油田有限责任公司采油工程研究院;
【基金】：中国石油大庆油田重点科技攻关课题(DQYT-1204003-2015-JS-821)经费资助
【分类号】：TE357

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