Shenjia Hydraulics

Release Date:

2022-09-14

What are the principles underlying combined porosity–permeability logging? We’ve previously provided a brief overview of this topic, but we’ve found that many customers still have questions. Today, we’ll take this opportunity to offer a more detailed explanation, hoping it will be helpful to those concerned.

What is the principle of combined porosity–permeability logging?

Porosity-permeability joint measurement of Principle What are they? We’ve previously provided a brief overview of this issue, but we’ve found that many customers still aren’t clear about it. Today, we’re taking this opportunity to explain it in more detail, hoping it will be helpful to those concerned.

Porosity-permeability joint measurement

Porosity-permeability joint measurement When using, When the gas pressure distribution along the sample length has stabilized, the gas pressure at each point along the sample varies only with displacement and not with time. Steady-state permeameters can be used only for samples with medium to high permeability. A key feature of steady-state permeability measurement is that a specified pressure is applied at the sample inlet, and, with both inlet and outlet pressures held constant, permeability is calculated using Darcy’s law. This method is not suitable for measuring low-permeability samples that do not obey Darcy’s law. Furthermore, even for samples with medium to high permeability, the lower the permeability, the longer it takes for the pressure to stabilize, resulting in slower measurement rates. Core–permeability joint measurement is based on Darcy’s law. - Kerl - A comprehensive calculation model. It is applicable not only to samples with medium and high permeability but also, in particular, to low-permeability samples that do not conform to Darcy’s law. In the porosity–permeability joint measurement, a gas reservoir at a specified pressure is positioned at the sample inlet.

Porosity-permeability joint measurement In At the start of the measurement, connect the vessel to the sample inlet and then record the pressure as a function of time. At this point, the gas pressure distribution along the sample length varies with both position and time. The sample’s permeability can be calculated from the temporal evolution of the gas‑vessel pressure and the relevant parameters, without requiring pressure stability. Core–permeability joint measurement is suitable for determining permeability across a wide range of values, particularly for low-permeability samples, and offers faster measurement speeds. Yrd-2 The fully automatic combined tester for overburden pressure, porosity, and permeability employs Boyle’s law and advanced calibration techniques to measure core porosity. Both permeability and porosity can be determined under confining pressure.

First, place the core sample into the sampler, enter the geometric parameters for each core and the required overburden pressure data into the software, and then begin the test. Initially, the instrument automatically positions… 1 The core sample is inserted into the core holder, where radial and axial pressures are applied to simulate formation overburden pressure. Permeability prediction is initiated, and the system automatically determines whether to use helium or nitrogen for permeability measurement. Subsequently, porosity and permeability measurements commence. Core–permeability joint testing. In After testing, release the radial and axial pressures, apply radial vacuum, and the line printer automatically prints the real-time measurement results.

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