油藏型储气库周期注采渗流和库容特征物理模拟

摘要/Abstract

摘要： 油藏型储气库流体渗流涉及油气水三相,其库容空间不仅包含气置换液的孔隙空间,油气间还存在溶解与组分传质作用。为明确周期注采过程中油气水互驱相渗特征和储气空间的组成,基于油藏型储气库运行工况,开展了多轮次气水、油水、气油互驱相渗实验及多周期注采长岩心仿真物理模拟实验,分析了两相互驱渗流规律、周期注采气驱液效率及油气相态变化,研究了储气库周期注采渗流能力、驱油效率及库容空间的变化规律。实验结果表明：①多轮次两相互驱过程中,水相会降低气相、油相的渗流能力,不利于储气库建库扩容;②采用“地层压力下气驱到极限采收率+上下限压力循环注采”的建库模式进行长岩心建库物理模拟,模型最终驱油效率达65.11%,其中水驱采油20%,气驱采油37.51%,循环注采占7.6%。连续气驱阶段是主要提采阶段,循环注采阶段为建库形成阶段;③长岩心气驱液置换的孔隙体积是库容量的主要组成部分,占比超70%,残余油溶解气和残余油收缩孔隙体积占比不足30%。第14轮次注采气后,库容量和工作气量均趋于稳定,二者主要受含气饱和度影响。因此,建议在油藏型储气库建库中,不宜急于进行衰竭采气,应优先实施“提采”策略,再开展“建库”工作。保持地层压力气驱油,待达到极限采收率后,再进行循环注采建库,以充分提高油水采出程度,进而提升库容量和工作气量。

关键词: 油藏型储气库, 多轮次两相互驱, 渗流特征, 长岩心物理模拟, 库容量, 工作气量

Abstract: The fluid flow in oil reservoir-type gas storage involve three phases of oil, gas, and water. The storage capacity space is not only the pore space for gas displacement of liquid, but oil and gas also have dissolution and component mass transfer effects. Based on operational state of oil reservoir type storage, the paper carried on relative permeability experiments of multi-cycle gas-water、oil-water and gas-oil mutual driving, and physical simulation of multi-cycle injection and production in long cores, analysed the seepage laws of two phase mutual driving and gas driving fluid efficiencies and fluid saturation changes of multi-cycle injection and production, studied the influences of multi-cycle injection and production to seepage capacity、sweep efficiency and storage space. The experimental result showed: (1) In the multi-stage two-way coupled process, the aqueous phase reduces the permeability of the gas phase and oil phase, which is not conducive to the establishment and expansion of gas storage facilities. The gas-oil two-way coupled process reduces the residual oil saturation and increases the space of mobile fluid, which is conducive to the establishment and expansion of gas storage facilities. (2) Carrying out physical simulation of building storaget with gas driving pil to limitation + cyclic injection-production between upper and floor pressure, the model's final oil efficiency is 65.11%, and water driving is 20%, gas driving is 37.15%, cyclic injection-production is 7.6%, gas driving is main enhanced stage, cyclic injection-production is the stage of building gas storage. (3) The pore volume of the long core gas drive liquid displacement is the main part of the storage capacity, accounting for more than 70%, the proportions of residual oil dissolved gas and residual oil shrinkage pore volume are less than 30%. The capacity stabilized after the 14th round of gas production and injection. The storage capacity and working gas volume of the gas storage are mainly affected by the gas saturation . It suggested that when building oil reservoir gas storage, it is not advisable to rush to deplete gas production, but to preferentially "lifting production", then "building gas storage", recommended to drive oil by gas with maintaining the reservoir pressure, to build gas storage by circulating injection and production when it reached the ultimate recovery efficiency, it can adequately increase oil and water recovery degree, which is conducive to increasing the storage capacity and working gas volume.

Key words: oil reservoir type gas storage, multiple cycles of mutual displacement, seepage characteristics, long core physical simulation, storage capacity, working volume

中图分类号:

TE341

张国辉,徐德月,李佳慧, 等. 油藏型储气库周期注采渗流和库容特征物理模拟[J]. 油气藏评价与开发, 0, (): 2024515-2024515.

ZHANG GUOHUI,XU DEYUE,LI JIAHUI, et al. Physical simulation on seepage and reservoir capacity characteristic of multi-cycle injection and production in reservoir type gas storage[J]. Petroleum Reservoir Evaluation and Development, 0, (): 2024515-2024515.

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