复兴地区侏罗系陆相页岩渗吸规律实验研究
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周朝(1988—),男,河北保定人,副研究员,博士,从事采油采气工程和完井工程技术研究。E-mail:zhouchao_joe@163.com。

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国家科技重大专项子课题“海相碳酸盐岩超深油气井关键工程技术”(2017ZX05005-005),中国石化“十条龙”项目“复兴侏罗系陆相页岩油气采油气技术”(P21078-8),中国石化重点实验室专项课题“陆相页岩油渗吸机制与返排制度研究”(KLP24008)。


Experimental research on imbibition law of Jurassic continental shale in Fuxing area
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    摘要:

    复兴地区侏罗系陆相页岩渗吸规律不明确,为闷井试采带来较大挑战,针对陆相页岩的渗吸规律和影响因素研究仍然欠缺。为此,基于低场核磁共振技术开展了复兴地区侏罗系陆相页岩渗吸规律实验。首先,测试并分析了凉高山组和自流井组东岳庙段页岩物性差异;随后,以渗吸前后孔渗变化作为评价指标参数,开展了不同岩性、流体介质、流体压力和黏土矿物含量对陆相页岩渗吸规律的影响分析,并评价陆相页岩润湿性。实验结果表明:与东岳庙段相比,凉高山组页岩平均孔隙度较小,平均渗透率较大;平均脆性矿物含量较高,平均黏土矿物含量较低;复兴地区侏罗系陆相页岩渗吸过程中黏土水化诱导产生微裂缝,提供了额外的渗吸通道,灰岩渗吸能力弱于页岩,渗吸时无微裂缝产生,储层中的介壳灰岩夹层可能会阻碍页岩渗吸和微裂缝扩展;页岩在水相中诱导微裂缝后,油相可加剧微裂缝扩展,油水复杂相态渗吸可能对页岩储层渗透率的改善有利;与 页岩常压渗吸相比,加压渗吸的诱导微裂缝和改善渗透率作用受限,虽然渗吸速率更大,但渗吸平衡时间更早,渗吸量更小,闷井期间须考虑上覆岩层压力对渗吸的影响;高黏土矿物含量页岩的水化诱导微裂缝更显著,改善渗透率的效果更明显;页岩在油相中渗吸速率和渗吸量小于水相,润湿性为亲水。实验揭示了复兴地区侏罗系陆相页岩渗吸规律和水化诱导微裂缝特征,为陆相页岩的闷井与返排试采提供了理论依据。

    Abstract:

    The imbibition law of the Jurassic continental shale in Fuxing area is not clear, which brings great challenges to the production test after well shut-in. In addition, studies on the imbibition law and influencing factors of continental shale are insufficient.Therefore,the experiment on the imbibition law of the Jurassic continental shale in Fuxing area was conducted based on the lowfield nuclear magnetic resonance (NMR). First, the differences in physical properties of shale of Lianggaoshan Formation and Dongyuemiao Member in Ziliujing Formation were tested and analyzed. Then, the changes in permeability and porosity before and after the imbibition were set as the evaluation indexes, and the influences of lithology, fluid, fluid pressure, and clay content on the imbibition law of the continental shale were analyzed. Besides, the wettability of the continental shale was evaluated. The experimental results show that compared with that of Dongyuemiao Member, the average porosity of shale of Lianggaoshan Formation is smaller, and the average permeability is larger; the average brittle mineral content is higher, and the average clay mineral content is lower. During the imbibition process of the Jurassic continental shale in Fuxing area, micro-fractures are induced by clay hydration, which provides additional imbibition channels. However, the imbibition ability of limestone is weaker than that of shale, and there are no micro-fractures during the imbibition; in addition, the shell limestone interlayer in the reservoir may inhibit the imbibition and micro-fracture propagation in the shale. The oil phase will enhance the micro-fracture propagation after the shale induces micro-fractures in the aqueous phase, and the complicated oil-water phase imbibition may be beneficial to the permeability improvement in the shale reservoir. Compared with atmospheric imbibition, pressureed imbibition has a limited effect on inducing micro-fractures and improving permeability, and the imbibition rate is larger; the imbibition equilibrium is earlier, but the imbibition amount is smaller. The influence of confining pressure on imbibition should be considered during well shut-in. The microfractures induced by hydration in shale with high clay mineral content are more significant, and the effect of improving permeability is more obvious. The imbibition rate and imbibition amount of shale in the oil phase are smaller than those in the aqueous phase,and the wettability of shale is hydrophilic. The experiment reveals the imbibition law and the characteristics of micro-fractures induced by the hydration of the Jurassic continental shale in Fuxing area, which provides a theoretical basis for the well shut-in and production test of continental shale during flowback.

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周朝,何祖清,秦星,张炜,徐毓珠,曾星航.复兴地区侏罗系陆相页岩渗吸规律实验研究[J].油气地质与采收率,2024,31(6):118~126

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  • 收稿日期:2023-09-19
  • 最后修改日期:2024-07-10
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  • 在线发布日期: 2024-12-05
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