Effect of Temperature on the Imbibition Efficiency of the Jimusar Tight Oil Reservoir
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摘要: 为了明确密切割体积压裂后温度对致密油藏渗吸效率的影响，利用高温高压致密岩心渗吸实验装置，通过渗吸驱油实验，研究了吉木萨尔凹陷芦草沟组天然致密油藏岩心在不同温度、压力条件下的渗吸机理。实验结果显示：随着温度升高，渗吸效率提高，渗吸速度变快，渗吸所需时间缩短；实验温度高于吉木萨尔致密油藏温度时，温度升高对渗吸效率影响较小；实验温度低于油藏温度时，温度越低，对渗吸效率影响越大；不同温度下单位面积渗吸油量与单位面积饱和油量呈正相关关系。研究结果表明，温度的变化对吉木萨尔凹陷芦草沟组致密油藏渗吸驱油作用具有较大影响，致密油藏体积压裂过程中应尽可能降低压裂液对地层造成的冷伤害。Abstract: In order to specify the effect of temperature on the imbibition efficiency in tight reservoirs after dense cut volume fracturing, imbibition mechanism experiments on the natural tight oil reservoir cores of Lucaogou Formation of Jimusar Sag were carried out under different temperature and pressure conditions by using the HTHP imbibition experimental apparatus for tight cores. The experimental results of imbibition and oil displacement showed that the imbibition efficiency increases as the temperature increases, the imbibition rate also accelerates with the increasing temperature, and the time required for imbibition reaction is reduced. When the experimental temperature is higher than the in-situ tight oil reservoir temperature of Jimusar Sag, the temperature increase has a minor effect on the imbibition efficiency. Correspondingly, when the experimental temperature is lower than the reservoir temperature, the lower the temperature, the greater its influence on the imbibition efficiency. There is a positive correlation between the imbibition amount and the saturated oil mass per unit area at different temperature conditions. The results indicated that temperature change has a great effect on the imbibition and oil displacement of the Lucaogou tight oil reservoirs in the Jimusar Sag. Therefore, the cold damage to the formation caused by the fracture fluid should be controlled as much as possible in the volume fracturing of tight oil reservoirs.
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Keywords:
- tight oil reservoir /
- temperature /
- soaking /
- imbibition efficiency /
- physical simulation /
- Jimusar Sag
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图 2 GZCKC-1型高温高压致密岩心渗吸实验装置
Figure 2. GZCKC-1 HTHP imbibition experimental apparatusfor tight cores
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图 3 地层原油的黏度-温度关系曲线
Figure 3. Relation curve between viscosity and temperature of crude oil
表 1 温度对致密油藏岩心渗吸效率的影响
Table 1 Effect of temperature on the imbibition efficiency of cores from tight oil reservoir
岩心编号 温度/℃ 渗吸效率，% 17-4 65 7.81 18-5 80 9.52 18-4 87 11.30 18-7 95 13.40 19-2 103 13.80 17-3 110 14.10 
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表 2 不同温度条件下单位面积渗吸油量与单位面积饱和油量的关系
Table 2 Relationship between the imbibition amount and the saturated oil mass per unit area at different temperature conditions
岩心编号 温度/℃ 单位面积渗吸油量/
(kg·m–2)单位面积饱和油量/
(kg·m–2)17-4 65 0.244 737 3.307 28 18-5 80 0.368 421 3.850 16 18-4 87 0.763 158 6.816 32 18-7 95 0.568 421 4.571 11 19-2 103 0.447 368 3.576 40 17-3 110 0.384 211 2.894 54
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表 3 不同时间不同温度下的岩心渗吸效率
Table 3 Imbibition efficiencies at different time and temperature conditions of core
岩心编号 温度/℃ 时间/h 渗吸效率，% 17-2 110 71.20 12.5 17-3 144.24 13.1 18-2 65 144.50 5.8 17-4 288.20 7.6
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