致密油储层动态渗吸采油效果及其影响因素

发布时间：2018-01-27 02:27

本文关键词： 大庆致密油藏动态渗吸采油影响因素物理模拟机理分析　出处：《大庆石油地质与开发》2017年03期 　论文类型：期刊论文

【摘要】：渗吸采油是(弱)亲水致密油藏高效开发的重要技术措施之一,渗吸采油物理模拟是优选渗吸液配方组成和优化渗吸液段塞组合的重要实验手段。针对大庆外围地区致密油藏开发技术需求,以高分子材料学、物理化学和油藏工程等理论为指导,以化学分析、仪器检测和物理模拟等技术为手段,以大庆外围扶余储层地质特征和流体性质为模拟研究对象,开展了动态渗吸采油效果及其影响因素实验研究。结果表明:在渗吸采油实验中,随注液压力升高,渗吸采收率增加;随注液速度增大,渗吸采收率增幅呈现出"先增后减"变化趋势;随渗吸液注入段塞尺寸增加、憋压时间延长和交替注入次数增加,渗吸采收率增加,但增幅逐渐减小。动态渗吸采油实验最优参数推荐:注液速度为0.2 m L/min、段塞尺寸为0.3 PV、憋压时间96 h和交替注入次数为3。与单独注渗吸液或增能剂措施相比较,采取"渗吸液+增能剂"组合方式可以产生协同效应,增强孔隙内油水交渗作用,提高渗吸采油效果。
[Abstract]:Permeability and oil recovery is one of the important technical measures for high efficiency development of (weak) hydrophilic tight reservoirs. The physical simulation of permeability and oil recovery is an important experimental means to optimize the composition of permeation and liquid absorption formula and to optimize the combination of seepage and liquid absorption slug. In order to meet the technical requirements of development of dense reservoirs in the peripheral area of Daqing, polymer materials are used. Based on the theory of physical chemistry and reservoir engineering, the geological characteristics and fluid properties of Fuyu reservoir in the periphery of Daqing are studied by means of chemical analysis, instrument detection and physical simulation. The experimental study on the effect of dynamic permeation and oil recovery and its influencing factors is carried out. The results show that the permeability recovery increases with the increase of injection pressure in the experiment of permeation and oil recovery. With the increase of liquid injection rate, the increase of osmotic recovery shows a trend of "increase first and then decrease". With the increase of the size of the slug, the pressure holding time and the times of alternate injection increase, and the permeability recovery factor increases. But the increase is gradually decreasing. The optimal parameters of dynamic permeability and oil recovery experiment are recommended as follows: the injection velocity is 0.2 mL / min and the slug size is 0.3 PV. The pressure holding time is 96 h and the times of alternate injection is 3. Compared with the measures of single injection of osmotic absorbent or energy enhancer, the synergistic effect can be produced by adopting the combination of "osmotic liquid absorbent and energy enhancer". Enhance oil and water permeability in pores and improve oil absorption and oil recovery.
【作者单位】：大庆油田有限责任公司采油工程研究院;东北石油大学提高油气采收率教育部重点实验室;
【基金】：中国石油大庆油田重点科技攻关课题“缝网压裂井增能吞吐技术研究”(DQYT-1204003-2015-JS-821)经费资助
【分类号】：TE357
【正文快照】： 大庆外围地区扶余储层致密油储量十分丰富,但由于储层渗透率较低,目前该资源尚未得到大规模开发利用,仅于2002年9月在葡31区块开辟了试验区(油水井距300 m,排距150 m),投产油水井15口,其中压裂油井11口,水井4口。前期开发油水井生产资料统计表明,试验区普遍存在注水困难、油井

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