页岩油用压驱一体剂的研制及性能评价——以苏北盆地阜宁组二段为例

doi:10.13809/j.cnki.cn32-1825/te.2024.05.013

摘要/Abstract

摘要：

针对苏北盆地页岩油储层在压裂过程中驱油剂与压裂液不配伍，导致压裂液黏度降低，甚至发生化学反应产生沉淀，严重影响压裂改造效果和生产效率等问题，以马来酸酐（C₄H₂O₃）、聚氧乙烯脂肪醇醚（HO（CH₂CH₂O）_m（CH₂）_nCH₃）、阴离子聚丙烯酰胺（（C₃H₅ON）_n）和白油等为原料，通过化学合成和物理复配的方法，研制出一种页岩油用压驱一体剂（HDFD）。室内评价了其表观黏度、减阻率、界面张力和驱油效率，并和现场所用的“减阻剂乳液+高温驱油剂”体系进行了对比。实验结果显示：HDFD在2×10^-3kg/L加量下表观黏度介于9~12 mPa·s，减阻率达70%以上，油水界面张力为5×10^-3mN/m，驱油效率提升40%，表明该药剂具有良好的压裂减阻和驱油性能。现场试验的2口井日产油量分别提升了40.6%和84.6%，表明该产品适用于苏北盆地阜宁组二段页岩油压裂工艺，在页岩油压裂驱油一体工艺中具有广阔的应用前景。

关键词: 苏北盆地, 页岩油, 压裂驱油, 渗吸置换, 性能评价

Abstract:

In the fracturing process of shale oil in Subei Basin, there has been a notable incompatibility between the oil displacement agent and the fracturing fluid. This issue leads to a reduction in the viscosity of the fracturing fluid and can even trigger chemical reactions that result in precipitation, adversely affecting both fracturing efficiency and productivity. To address this, a new fracturing-displacement agent（HDFD） has been developed specifically for shale oil. This agent is composed of maleic anhydride（C₄H₂O₃）, polyoxyethylene aliphatic alcohol ether（HO（CH₂CH₂O）_m（CH₂）_nCH₃）, anionic polyacrylamide（（C₃H₅ON）_n）, and white oil, produced through chemical synthesis and physical blending methods. In laboratory evaluations, the HDFD displayed an apparent viscosity of 9~12 mPa·s, a drag reduction rate of over 70%, an oil-water interfacial tension of 5×10^-3 mN/m, and a 40% increase in oil displacement efficiency at a 2×10^-3 kg/L concentration. Compared with the“drag reduction emulsion + high temperature oil displacement agent” system used in the field, these results suggest that HDFD performs exceptionally well in reducing drag in fracturing fluids and enhancing oil displacement. Field tests conducted on two wells using this agent showed a daily oil production increase of 40.6% and 84.6%, respectively. These outcomes confirm that HDFD is effective for use in the shale oil reservoir of the second member in Subei Basin and holds significant promise for future applications in integrated shale oil fracturing and displacement technologies.

Key words: Subei Basin, shale oil, fracturing-displacement, imbibition replacement, performance evaluation

中图分类号:

TE39

王维恒,郭鑫,张斌等. 页岩油用压驱一体剂的研制及性能评价——以苏北盆地阜宁组二段为例[J]. 油气藏评价与开发, 2024, 14(5): 771-778.

WANG Weiheng,GUO Xin,ZHANG Bin, et al. Development and performance evaluation of fracturing-displacement agent（HDFD） for shale oil: A case study of the second member of Funing Formation, Subei Basin[J]. Petroleum Reservoir Evaluation and Development, 2024, 14(5): 771-778.

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加量/ （kg/L）	油水界面张力/（mN/m）
加量/ （kg/L）	实验1	实验2	实验3	实验4	实验5	实验平均值
1×10^-3	0.436 50	0.357 10	0.626 30	0.321 20	0.338 40	0.415 900
2×10^-3	0.053 34	0.033 61	0.057 30	0.041 20	0.044 70	0.046 030
3×10^-3	0.005 13	0.005 05	0.006 77	0.007 21	0.002 37	0.005 306
4×10^-3	0.011 90	0.011 20	0.012 00	0.014 10	0.013 30	0.012 500
5×10^-3	0.215 20	0.318 70	0.453 30	0.517 10	0.312 90	0.363 440

井号	pH值	综合性能
井号	pH值	表观黏度/ （mPa·s）	减阻率/ %	油水界面张力/（mN/m）	驱油效率/ %
QY1-1	7~8	3~6	48.21	0.258 1	23.21
QY1-2	7~8	9~12	69.73	0.004 6	39.18
QY1-3	7~8	9~12	70.22	0.006 7	41.29

井号	段数	总液量/m³	平均液量/m³	总砂量/m³	平均砂量/m³	施工排量/（m³/min）	施工压力/MPa	破裂压力/MPa	停泵压力/MPa	砂比/%
QY1-1	24	121 989	5 082.88	3 287.1	136.9	10~15	70.5~99.5	72.4~91.4	37.5~42.7	2.69
QY1-2	23	122 317	5 318.14	3 698.2	160.8	15~18	72.6~86.1	78.9~83.2	41.5~50.1	3.02
QY1-3	25	132 482	5 299.29	4 058.2	162.3	15~17	79.2~82.7	79.4~82.2	40.9~49.9	3.06