Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Construction method of dense sandstone multi-scale pore model and application

A dense sandstone, multi-scale technology, applied in the direction of suspension and porous material analysis, measuring devices, scientific instruments, etc., can solve the problems of scarcity of instruments, time-consuming, and restrictions on the universal use of Nano-CT systems, and achieve easy implementation and technical advanced effects

Active Publication Date: 2018-03-20
CHINA PETROLEUM & CHEM CORP +1
View PDF4 Cites 26 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the existing Micro-CT scanning system can only obtain micron-resolution images, it cannot identify the nanopore throats commonly developed in low-permeability tight sandstones, so it is not suitable for such rocks
Although more advanced Nano-CT systems can be used to obtain pore images with nanoscale resolution, the field of view of CT images is generally inversely proportional to the resolution, that is, the higher the resolution, the smaller the size of the captured image. Therefore, Nano-CT system cannot meet the image size requirements of multi-scale pore modeling
In addition, high cost, time-consuming, and scarcity of instruments also limit the widespread use of Nano-CT systems

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
  • Construction method of dense sandstone multi-scale pore model and application
  • Construction method of dense sandstone multi-scale pore model and application
  • Construction method of dense sandstone multi-scale pore model and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0095] This embodiment is used to illustrate the construction method of the tight sandstone multi-scale pore model of the present invention, and its flow is as follows figure 2 shown.

[0096] The brown-gray fine-grained lithic sandstone samples of the tight sandstone gas field are figure 1 way to split. One of them was used for the mercury injection test described below, and the other was used for the Micro-CT scan described below.

[0097] (1) Obtain Micro-CT images of rock samples and capillary pressure curves

[0098] a.Micro-CT scan

[0099] The MicroXCT-400 system of Xradia Company in the United States was used to scan the brown-gray fine-grained lithic sandstone samples of the tight sandstone gas field mentioned above. During this process, the sample stage will rotate 360 ​​degrees and can take 1080 projection images. A three-dimensional structural image composed of 986 32-bit grayscale slice images (such as image 3 shown), the image resolution is 2.15 μm.

[0...

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
porosityaaaaaaaaaa
Login to View More

Abstract

The invention relates to the field of research on the physical properties of sandstone of low-permeability dense sandstone reservoir, and discloses a construction method of a dense sandstone multi-scale pore model and an application. The invention provides the construction method of a dense sandstone multi-scale pore model, which comprises the following steps: (1) developing a mercury injection experiment and establishing a rock sample capillary pressure curve; (2) establishing a three-dimensional digital core by using Micro-CT scanning; (3) determining the spatial position coordinates and geometric construction characteristic parameters of the pore and simplifying the pore into pore nodes; (4) determining the communication relation among the pore nodes according to the spatial position ofthe pore nodes; (5) distributing pore throat radius, establishing an initial pore model, and then fitting the initial pore model into a capillary pressure curve; and (6) adjusting pore throat parameters and pore parameters in the initial pore model according to the actually measured capillary pressure curve. The pore model disclosed by the invention is accurate and reliable.

Description

technical field [0001] The invention relates to the field of research on petrophysical properties of low-permeability tight sandstone reservoirs, in particular to a construction method and application of a multi-scale pore model of tight sandstone. Background technique [0002] Low-permeability tight sandstone is an important oil and gas reservoir, containing rich oil and gas resources, and is one of the key areas of exploration and development at present. In order to efficiently develop the oil and gas in the pore space of low-permeability tight sandstone, it is first necessary to have an accurate understanding of the pore structure and physical parameters of the reservoir rock, which is the basis and key of reservoir evaluation and oil and gas development. [0003] For medium-high permeability sandstone, currently the core experiment analysis method is mainly used to analyze the physical properties and seepage characteristics of various reservoir rocks. This type of metho...

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
Inventor 曹廷宽刘成川曾焱卜淘王勇飞高伟杨建曾宪兵甘文兵王子夜杨宇鹏马增彪罗桂滨
Owner CHINA PETROLEUM & CHEM CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Eureka Blog
Learn More
PatSnap group products