致密储层纳米增注技术研究与应用

doi:10.3969/j.issn.1006-6535.2023.01.024

摘要/Abstract

摘要： 针对魏家楼致密储层油藏注水压力上升快的问题,引入了纳米增注技术,通过微细管和岩心驱替实验装置对纳米增注技术的增注原理和影响因素进行了分析。结果表明:纳米增注剂能够改变岩石润湿性,可使亲水储层改变为中性或亲油储层,减少亲水储层孔喉表面形成的水膜的厚度;纳米增注剂还可吸附在孔喉表层,使孔喉表层的水化膜剥离,增大孔喉有效半径,降低流体阻力,从而增加地层吸水能力。微细管驱替实验表明,质量分数为0.010%的纳米增注液,对直径为50～100 μm的微细管降压效果较好,降压率最大可达30.1%;天然岩心驱替实验表明,纳米增注液注入量为1倍孔隙体积、吸附时间大于36 h时,降压效果较好,降压率达40.0%。魏家楼油田降压增注现场试验结果表明,纳米增注剂能使注水井注入压力降低2.4 MPa。该研究结果对致密储层油藏高压欠注井治理具有很好的应用价值。

关键词: 纳米增注剂, 润湿性, 降压率, 水化膜, 疏水层, 接触角, 致密储层, 魏家楼油田

Abstract: In response to the problem of rapid rise of water injection pressure in the Weijialou tight reservoir, the nano-injection enhancing technology was introduced, and the principle and influencing factors of the nano-injection enhancing technology were analyzed through slim-tubes and core flooding experiment devices. The result shows that the nano-injection enhancer can change the wettability of rocks, which can change hydrophilic reservoir into neutral or oleophilic reservoir and reduce the thickness of water film formed on the surface of pore throat of hydrophilic reservoir; the nano-injection enhancer can also adsorb on the surface of pore throat to strip the hydration film on the surface of pore throat, so as to increase the effective radius of pore throat and reduce the fluid resistance, thus increasing the water absorption capacity of the formation. The slim-tube displacement experiments show that the nano-injection enhancing solution with a mass fraction of 0.010% has a better pressure reduction effect for slim-tubes with a diameter of 50-100 μm, with a maximum pressure reduction rate of 30.1%; the natural core flooding experiments show that the nano-injection enhancing solution has a better pressure reduction effect with a pressure reduction rate of 40.0% when the injection volume of the nano-injection enhancing solution is 1 times the pore volume and the adsorption time is greater than 36 h. The results of the field test of pressure reduction and injection enhancing in Weijialou Oilfield show that the nano-injection enhancer can reduce the injection pressure of water injection wells by 2.4MPa. The results of this study have good application value for high-pressure under-injection well governance in tight reservoirs;Weijialou oilfield

Key words: nano-injection enhancer, wettability, pressure reduction rate, hydration film, hydrophobic layer, contact angle, tight reservoir, Weijialou Oilfield

中图分类号:

TE928

金永辉, 王治富, 孙庆名, 李源流, 王波, 陈义哲. 致密储层纳米增注技术研究与应用[J]. 特种油气藏, 2023, 30(1): 169-174.

Jin Yonghui, Wang Zhifu, Sun Qingming, Li Yuanliu, Wang Bo, Chen Yizhe. Research and Application of the Nano-injection Enhancing Technology in Tight Reservoirs[J]. Special Oil & Gas Reservoirs, 2023, 30(1): 169-174.

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