鄂尔多斯盆地长8层致密砂岩平板注水实验
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陕西省科技统筹创新工程项目基金


Plate water injection experiments of Chang-8 layer tight sandstone in Ordos basin
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    摘要:

    为了探索致密砂岩油藏有效注水开发方式,采用鄂尔多斯盆地长8层露头岩心分别制作长宽高为40cm、40cm、5cm的平板模型6个,通过平板实验研究了周期注水、水平井同井异步注采、水平井异井异步注采对油水分布、压力分布、最终采出程度的影响。结果表明,周期注水平板初期注水流线向采出端均匀推进,形成扇形水驱前缘,在裂缝处形成窜流,注水半周期越长,裂缝水窜越明显,适当缩短注水半周期有利于提高采出程度。水平井同井异步注采实验由于裂缝间距小,注入水易水窜,剩余油呈块状富集在靠近采出端边角及平板中下部,水驱范围窄,最终采收率低。水平井异井异步注采实验注入水由注水缝向同井相邻的采油缝以及对面的采油缝同时流动,以相对缝间流动为主;水平井异井异步裂缝正对注采实验剩余油呈条状富集在靠近生产井边角处及平板中部,水平井异井异步裂缝错开注采实验剩余油呈折线状富集在靠近生采出端边角处及平板中部,二者水驱范围均较广,注采裂缝相互错开有效避免了过早水淹,提高了采出程度

    Abstract:

    In order to explore an effective water injection development method for tight sandstone reservoirs, six flat models with length, width, and height of 40cm, 40cm, and 5cm were made using Chang-8 layer outcrop cores from the Ordos Basin. The effects of cyclic water injection, asynchronous injection-production in the same well of horizontal wells , and asynchronous injection and production of different wells in horizontal wells on oil and water distribution, pressure distribution, and final recovery degree were studied through plate experiments.The experimental results show that the initial water injection flow line of the periodic water injection plate advances evenly towards the production end, forming a fan-shaped water drive front, and forming a channeling flow at the fracture. The longer the water injection half cycle is, the more obvious the fracture water channeling is. Properly shortening the water injection half cycle is conducive to improving the recovery degree. The injection water of asynchronous injection and production experiment in different horizontal wells flows from the injection fracture to the adjacent production fracture of the same well and the opposite production fracture at the same time, mainly between the relative fractures; The asynchronous fracture of the horizontal well is opposite the injection and production test, and the remaining oil is concentrated in a strip near the edge of the production well and in the middle of the plate. The asynchronous fracture of the horizontal well is staggered, and the remaining oil in the injection and production test is concentrated in a broken line near the edge of the production well and in the middle of the plate. Both of them have a wide range of water drive. The staggered injection and production fractures effectively avoid premature water flooding and improve the recovery degree.

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孙欣华,张鸣,党海龙,等. 鄂尔多斯盆地长8层致密砂岩平板注水实验[J]. 科学技术与工程, 2024, 24(15): 6263-6271.
SUN Xin-hua, ZHANG Ming, DANG Hai-long, et al. Plate water injection experiments of Chang-8 layer tight sandstone in Ordos basin[J]. Science Technology and Engineering,2024,24(15):6263-6271.

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  • 收稿日期:2023-06-05
  • 最后修改日期:2024-05-10
  • 录用日期:2023-11-14
  • 在线发布日期: 2024-06-04
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