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An experimental investigation on effects of saturation levels and fluid types on elastic properties of bitumen-saturated sands at elevated temperatures
Energy ( IF 9 ) Pub Date : 2021-09-11 , DOI: 10.1016/j.energy.2021.122011
Hui Li 1 , De-hua Han 2 , Min Sun 1 , Hemin Yuan 3 , Jinghuai Gao 1
Affiliation  

The change of saturation levels and fluid types during steam-assisted gravity drainage (SAGD) production significantly influences elastic properties of oil sands. However, experimentally establishing petrophysical-elastic parameters relationships of oil sands that govern the SAGD process remains a challenge. Here, with modified low impedance transducers and an optimized measurement workflow, oil sands sample with varying saturation levels and fluid types are successfully investigated at varying temperatures and pressures. This is the first time that oil sands are measured at controlled bitumen-saturated levels at elevated temperatures. The results demonstrate that elastic properties of the tested sample are somewhat dependent on the pressure but strongly dependent on the temperature at varying saturation levels and fluid types. Specifically, both P- and S-wave velocities at dry conditions increase with increasing pressure but insensitive to the temperature change. However, both P- and S-wave velocities at fluid-saturated conditions are much higher than that at dry conditions mainly due to part of bitumen transforming to solid frame in low temperatures (<Liquid point) or fluid effects in high temperatures (>Liquid point). These experimental investigations qualitatively capture the elastic behaviors of bitumen-bearing sands at varying petrophysical conditions, thereby helping us in understanding the underlying processes of heavy oil production using the SAGD technique.



中文翻译:

高温下饱和度和流体类型对沥青饱和砂土弹性特性影响的实验研究

蒸汽辅助重力泄油(SAGD)生产过程中饱和度和流体类型的变化显着影响油砂的弹性特性。然而,通过实验建立控制 SAGD 过程的油砂的岩石物理-弹性参数关系仍然是一个挑战。在这里,通过改进的低阻抗传感器和优化的测量工作流程,在不同温度和压力下成功研究了具有不同饱和度和流体类型的油砂样品。这是第一次在高温下在受控的沥青饱和水平下测量油砂。结果表明,在不同的饱和度和流体类型下,测试样品的弹性特性在某种程度上取决于压力,但强烈取决于温度。具体来说,干燥条件下的 P 波和 S 波速度都随着压力的增加而增加,但对温度变化不敏感。然而,流体饱和条件下的 P 波和 S 波速度都远高于干燥条件下的 P 波和 S 波速度,这主要是由于部分沥青在低温下(<液点)转变为固体框架或高温下的流体效应(>液观点)。这些实验研究定性地捕获了含沥青砂在不同岩石物理条件下的弹性行为,从而帮助我们了解使用 SAGD 技术生产重油的潜在过程。流体饱和条件下的 P 波和 S 波速度均远高于干燥条件下的速度,这主要是由于部分沥青在低温下(<液点)或高温下的流体效应(>液点)转变为固体骨架. 这些实验研究定性地捕获了含沥青砂在不同岩石物理条件下的弹性行为,从而帮助我们了解使用 SAGD 技术生产重油的潜在过程。流体饱和条件下的 P 波和 S 波速度均远高于干燥条件下的速度,这主要是由于部分沥青在低温下(<液点)或高温下的流体效应(>液点)转变为固体骨架. 这些实验研究定性地捕获了含沥青砂在不同岩石物理条件下的弹性行为,从而帮助我们了解使用 SAGD 技术生产重油的潜在过程。

更新日期:2021-09-12
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