油溶性封堵剂在底水油藏压裂中的适应性研究

发布时间：2018-03-08 06:00

本文选题：底水油藏　切入点：油溶性封堵剂　出处：《西安石油大学》2017年硕士论文　论文类型：学位论文

【摘要】：本文依据底水油气藏开发过程中需要进行压裂以提高原油采收效率的现实需求,采用先期堵水以便于充分利用地层能量,并防止底水锥进通道形成的堵水理念,选用容易携带和铺置,可以减少液相和沉积物对储层伤害的固体颗粒油溶性树脂作为选择性封堵剂,提出了油溶性封堵剂辅助控缝高压裂堵底水工艺的设想用于底水油气藏开发,以此为基础研究该工艺在底水油气藏开发过程中的适应性。油溶性封堵剂的室内静态实验表明,实验用油溶性封堵剂在不同携带液中无相互攒聚现象,分散性较好,易于携带,可以通过合理的携带工艺使之沉降形成人工隔层;实验用油溶性封堵剂的最佳油溶温度为70°C,原油含蜡量越低,溶解时间越长,溶解度越高;油溶性封堵剂与地层水,酸液、碱液配伍性好,可以适应于多种地层条件和工艺。室内动态导流实验表明,油溶性封堵剂和隔离剂所形成复合人工隔层的导流能力受到油溶性封堵剂与隔离剂的质量配比,油藏温度,以及油藏的含油饱和度等方面的影响。其中油藏温度、油溶性封堵剂与隔离剂的质量配比主要影响人工隔层的水相渗流能力,油藏含油饱和度主要影响人工隔层的油相渗流能力。通过对施工过程的讨论,建议使用隔离剂与油溶性封堵剂间隔式交替注入的方式将其携带入地层;通过温度场模拟确定所需油溶性封堵剂玻璃化温度后进行油溶性封堵剂类型的选择。通过建立的油溶性封堵剂与隔离剂所形成人工隔层存在条件下裂缝高度与驱替压力的计算关系式,研究人工隔层厚度、油溶性封堵剂与隔离剂质量配比对裂缝高度控制的影响。结果表明:在低油溶性封堵剂与隔离剂质量配比条件下,人工隔层厚度的增加为缝高控制的主要因素。
[Abstract]:According to the practical demand of fracturing in the development of bottom water reservoir to improve the recovery efficiency of crude oil, this paper adopts the idea of water shutoff in advance to make full use of formation energy and to prevent the formation of bottom water coning channel. The oil soluble resin of solid particles, which can reduce the damage of liquid phase and sediment to reservoir, is selected as selective plugging agent. This paper puts forward the assumption that the oil-soluble plugging agent can be used in the development of the bottom water reservoir by using the oil-soluble plugging agent as the assistant to control the fracture and plugging at high pressure. On the basis of this, the adaptability of the process in the development of the oil-soluble oil and gas reservoir is studied. The laboratory static experiment of the oil-soluble plugging agent shows that, The experimental oil-soluble plugging agent has no mutual accumulation phenomenon in different carrier liquid, has good dispersibility and is easy to carry, and can be made to form artificial interlayer by reasonable carrying technology. The optimum oil soluble plugging agent is 70 掳C, the lower the wax content in crude oil, the longer the dissolution time, the higher the solubility, the better compatibility of oil soluble plugging agent with formation water, acid and lye. It can be adapted to a variety of formation conditions and techniques. The indoor dynamic flow diversion experiments show that the conductivity of the compound artificial barrier formed by oil soluble plugging agent and isolator is affected by the mass ratio of oil soluble plugging agent to isolator and reservoir temperature. And the oil saturation of the reservoir. The temperature of the reservoir, the mass ratio of the oil soluble plugging agent and the isolator mainly affect the water phase percolation ability of the artificial interlayer. The oil saturation of reservoir mainly affects the oil phase percolation ability of artificial interlayer. Through the discussion of construction process, it is suggested to carry it into the formation by the alternate injection of the spacer and the oil soluble plugging agent. The type of oil-soluble plugging agent was selected after vitrification temperature of oil-soluble plugging agent was determined by simulation of temperature field. Fracture height and displacement under the condition of artificial interlayer between oil-soluble plugging agent and isolator were established. For the calculation of pressure, The effects of artificial interlayer thickness and the mass ratio of oil soluble plugging agent and isolator on the control of fracture height are studied. The results show that under the condition of low oil soluble plugging agent and isolation agent mass ratio, The increase of the thickness of artificial septum is the main factor to control the seam height.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE357

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