使用压力和流量数据的恒定头过渡方法来确定紧密岩石的透性和特定存储
1Climate Change Response Research Division, Korea Institute of Geoscience and Mineral Resources, Daejeon 34132, South Korea.
MethodsX
|September 5, 2024
概括
一种新的恒定头过渡法准确地估计了紧密岩石的液压特性. 这种方法结合了流量和压力数据,缩短了测试时间,以提高透性和特定的储存测量.
科学领域:
- 地质科学 地质科学
- 水文地质学 水文地质学
- 岩石机械学 岩石机械学
背景情况:
- 精确估计液压性能,如透性和特定存储,对于理解紧密岩层中的流体流动至关重要.
- 对于极低透率的样本,如页岩和晶体岩石,传统方法可能耗时或缺乏准确性.
研究的目的:
- 开发和验证一种新的"恒定头过渡方法",以更好地估计透性和狭窄岩石中的特异性储存.
- 提高低透性地质材料液压性能测量的效率和准确性.
主要方法:
- 在限制压力下对圆柱状岩石样本进行实验测试.
- 应用一个恒定的上游压力边界条件与有限的下游储存.
- 同时测量上游流体流量 (使用注射器) 和下游压力瞬态.
- 数据分析结合流量和压力目标函数进行参数估计.
主要成果:
- 恒定头过渡方法允许直接测量上游流量,克服了上游压力波动的方法的局限性.
- 尽量减少下游储存,大大减少了整体测试时间.
- 结合上游流量和下游压力过渡数据,可以比单独使用压力数据更准确地估计透率和特定储存.
- 通过整合流量和压力目标函数,可以实现最佳的曲线适配.
结论:
- 开发的恒定头过渡方法提供了一个更准确和更有效的方法来表征紧密岩石的液压特性.
- 这种方法对具有极低透性的样品尤其有利,因为传统技术可能会遇到困难.
- 流量和压力数据的结合使用是实现可靠结果的关键在过渡流量分析.
相关概念视频
Flow Table Test
138
The flow table test is an established method used to assess the workability of concrete, particularly useful for evaluating highly flowable concrete mixes. This test employs an apparatus that consists of a wooden board topped with a steel plate, collectively weighing 35 pounds. The board is connected to a base via a hinge and measures 27.6 inches on each side.
Concrete is placed within a truncated cone mold that is 8 inches high with an 8-inch base diameter and a 5-inch top diameter. The...
Concrete is placed within a truncated cone mold that is 8 inches high with an 8-inch base diameter and a 5-inch top diameter. The...
138
Uniform Depth Channel Flow
63
Uniform depth channel flow keeps fluid depth consistent along channels such as irrigation canals. In natural channels, such as rivers, approximate uniform flow is often assumed. This condition occurs when the channel’s bottom slope matches the energy slope, balancing potential energy lost from gravity with head loss due to shear stress. This balance prevents depth changes along the channel length, resulting in a steady, uniform flow.Uniform flow in open channels with a constant cross-section...
63
Pressure Variation in a Fluid at Rest
233
In a fluid at rest, the pressure at any point beneath the fluid surface depends solely on the depth, not on the container's shape or size. This principle, known as hydrostatic pressure, arises because, in stationary fluids, there is no acceleration, meaning the forces within the fluid balance out. Only vertical forces, caused by the weight of the fluid above, contribute to pressure changes with depth.
When measuring pressure at two different levels within the fluid, the difference in...
When measuring pressure at two different levels within the fluid, the difference in...
233
Uniform Depth Channel Flow: Problem Solving
59
To calculate the flow rate for a trapezoidal channel, first, identify the bottom width, side slope, and flow depth of the channel. The cross-sectional area (A) corresponding to the depth of flow (y), channel bottom width (B), and side slope (θ) is determined by:Next, calculate the wetted perimeter, which includes the bottom width and the sloped side lengths in contact with the water. Using the values of the cross-sectional area and the wetted perimeter, determine the hydraulic radius by...
59
Conservation of Mass in Finite Cotrol Volume
1.3K
The principle of conservation of mass is a fundamental law in fluid mechanics and is applied using the continuity equation. We apply the concept to a finite control volume to derive the continuity equation.
A system is defined as a collection of unchanging contents, and the conservation of mass states that a system's mass is constant.
A system is defined as a collection of unchanging contents, and the conservation of mass states that a system's mass is constant.
1.3K
Fluid Pressure
590
In mechanical engineering, fluid pressure plays a critical role in designing systems that utilize liquid flow, such as hydraulic systems, pumps, and valves. When designing these systems, engineers must ensure they can withstand the forces created by fluid pressure to avoid damage or failure.
According to Pascal's law, a fluid at rest will generate equal pressure in all directions. This pressure is measured as a force per unit area, and its magnitude depends on the fluid's specific...
According to Pascal's law, a fluid at rest will generate equal pressure in all directions. This pressure is measured as a force per unit area, and its magnitude depends on the fluid's specific...
590


