Petroleum Exploration and Development >

0 20240404 - 20240404

DOI: https://doi.org/10.11698/PED.2023453

Experiment of dynamic seepage in tight/shale reservoirs under matrix fracture coupling

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  • 1. University of Chinese Academy of Sciences, Beijing 100049, China;
    2. Institute of Porous Flow & Fluid Mechanics, Chinese Academy of Sciences, Langfang 065007, China;
    3. Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China;
    4. State Key Laboratory of Enhanced Oil Recovery, Beijing 100083, China;
    5. Exploration and Development Research Institute of Jilin Oilfield, Songyuan 138000, China;
    6. PetroChina Qinghai Oilfield Company, Dunhuang, 817500, China

Received date: 2023-08-19

  Revised date: 2024-02-05

  Online published: 2024-02-19

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Abstract

A physical simulation method with a combination of dynamic displacement and imbibition was established by integrating nuclear magnetic resonance (NMR) and CT scanning. The microscopic pore throat production mechanism of tight/shale oil dynamic imbibition and the influencing factors on the development effect of dynamic imbibition were analyzed. The dynamic seepage process of fracking-soaking-backflow-production integration was simulated, which reveals the dynamic production characteristics of different development stages and their contribution to enhancing oil recovery (EOR). The results show that the seepage of tight/shale reservoirs can be divided into three stages: strong displacement and weak imbibition produced rapidly by displacement between macropores and fractures, weak displacement and strong imbibition produced slowly by reverse imbibition of small pores, and weak displacement and weak imbibition at dynamic equilibrium. The greater the displacement pressure, the higher the displacement recovery, and the lower the imbibition recovery. However, if the displacement pressure is too high, the injected water is easy to break through the front and reduce the recovery degree. The higher the permeability, the greater the imbibition and displacement recovery, the shorter the time of imbibition balance, and the higher the final recovery. The fracture can effectively increase the imbibition contact area between matrix and water, reduce the oil-water seepage resistance, promote the oil-water displacement between matrix and fracture, and improve the oil displacement rate and recovery of the matrix. The soaking after fracturing is beneficial to the imbibition replacement and energy storage of the fluid; also, the effective use of the carrying of the backflow fluid and the displacement in the mining stage is the key to enhancing oil recovery.

Key words： tight oil; shale oil; physical simulation; nuclear magnetic resonance; CT scanning; dynamic imbibition; production performance; EOR

Cite this article

DU Meng, YANG Zhengming, LYU Weifeng, LI Zhongcheng, WANG Guofeng, CHEN Xinliang, QI Xiang, YAO Lanlan, ZHANG Yuhao, JIA Ninghong, LI Haibo, CHANG Yilin, HUO Xu . Experiment of dynamic seepage in tight/shale reservoirs under matrix fracture coupling[J]. Petroleum Exploration and Development, 0 : 20240404 -20240404 . DOI: 10.11698/PED.2023453

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