Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Digital imaging technology-based method for calculating relative permeability of compact core

A relative permeability and digital imaging technology, applied in permeability/surface area analysis, calculation, earthwork drilling, etc., can solve the problems of large difference in phase permeability curves and no consideration, and avoid waste of resources, time-consuming and instrumentation. Effects of precision problems

Active Publication Date: 2020-03-06
SOUTHWEST PETROLEUM UNIV
View PDF9 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both the steady-state method and the dynamic method do not consider the influence of rock morphology characteristics such as internal structure and pore distribution on the relative permeability curve, and the calculated relative permeability curves are often quite different from the measured curves.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Digital imaging technology-based method for calculating relative permeability of compact core
  • Digital imaging technology-based method for calculating relative permeability of compact core
  • Digital imaging technology-based method for calculating relative permeability of compact core

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0132] (1) Choose different porosity fractal dimensions D f =1.3, 1.4, 1.5, same tortuosity fractal dimension D T 、Maximum pore equivalent diameter λ max and minimum pore equivalent diameter λ min , as the eigenvalue of the core pore structure parameters, used to calculate the influence of different porosity fractal dimensions on the relative permeability curve.

[0133] (2) Taking t=0 as the starting time, calculate the corresponding critical capillary diameter, and judge the distribution of all capillary fluids in the core at this moment.

[0134] (4) Simulate and calculate the flow Q of single-phase flow s , and then simulate and calculate the water phase flow rate Q when water flooding oil flows at t=0 w and oil phase flow rate Q o .

[0135] (5) simulated calculation of water phase volume, pore volume and water saturation in the rock core when t=0;

[0136] (6) Calculate the relative permeability k corresponding to the water saturation ro and k rw .

[0137] (7)...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
diameteraaaaaaaaaa
lengthaaaaaaaaaa
Login to View More

Abstract

The invention discloses a digital imaging technology-based method for calculating relative permeability of a compact core. The digital imaging technology-based method comprises the following steps ofS1, preparing a compact core small column sample conforming to resolution requirement; S2, scanning and building a digital core by MicroCT-400; S3, performing statistic analysis on a parameter for reflecting rock pole structure and shape characteristic according to the digital core; S4, calculating tortuosity fractal dimension DT and porosity fractal dimension Df by a 3D image fractal box dimension algorithm; and S5, performing analysis statistic on maximum pore equivalent diameter Lambda<max> and minimum pore equivalent diameter Lambda<min> by a label. By the digital imaging technology-basedmethod, the problems of time consumption of experiment, instrument accuracy, incapability of repeated calculation simulation and resource waste by repeated physical experiment are solved.

Description

technical field [0001] The invention relates to the field of analyzing the microscopic physical properties of tight rocks, in particular to a method for calculating the relative permeability of tight rock cores based on digital imaging technology. Background technique [0002] Tight reservoirs are currently the focus of research on the development of unconventional oil and gas resources, and have broad development prospects. The flow of oil and gas in low-permeability tight reservoirs is often accompanied by non-Darcy flow phenomenon. In order to effectively characterize the low-velocity non-Darcy flow effect, a threshold pressure gradient is introduced. Due to the low permeability and the existence of threshold pressure gradient, the measurement of relative permeability curve takes a long time and has poor accuracy. Therefore, how to establish a set of relative permeability calculation methods considering the low permeability characteristics of porous media is very critica...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08
CPCG01N15/0826G01N15/088E21B49/00G01N2015/0846Y02A10/40E21B49/0875E21B49/02G06T17/05G06T17/00
Inventor 段永刚李政澜方全堂魏明强彭瑀卫诗豪伍梓健盛舒遥
Owner SOUTHWEST PETROLEUM UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com