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

Visual system and method for starting migration of pulverized coal in fracture induced by gas-water two-phase flow

A crack and pulverized coal technology is applied in the field of gas-water two-phase flow induced pulverized coal start-up and migration visualization system in coal seam cracks. Simple, Powerful Effects

Pending Publication Date: 2022-03-15
CHINA UNIV OF PETROLEUM (EAST CHINA)
View PDF2 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (1) In the prior art, it is difficult to restore the surface properties of natural cracks in the coal seam based on artificial cracks made of glass plates, and it is impossible to truly simulate the start-migration behavior of coal powder, and the accuracy of relevant information obtained is poor;
[0006] (2) In the prior art, the start-migration visualization experiment of coal powder is carried out based on the natural fractures in the coal sample. Although the start-migration behavior of coal powder can be truly reproduced, it is difficult to realize the reuse of natural cracks, so it cannot be carried out. Research on the influencing factors of pulverized coal start-up-migration behavior, the function of the experimental system is relatively simple;
[0007] (3) In the prior art, a core clamping device with a relatively complex structure is mostly used to adjust the width of artificial or natural cracks, and the experimental process is cumbersome and costly

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
  • Visual system and method for starting migration of pulverized coal in fracture induced by gas-water two-phase flow
  • Visual system and method for starting migration of pulverized coal in fracture induced by gas-water two-phase flow
  • Visual system and method for starting migration of pulverized coal in fracture induced by gas-water two-phase flow

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0053] In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, the present invention can be implemented in many other ways different from those described here, and those skilled in the art can make similar improvements without departing from the connotation of the present invention, so the present invention is not limited by the specific implementations disclosed below.

[0054] The technical solutions of the present invention will be further described below in conjunction with specific embodiments.

[0055] Such as Figure 1-Figure 2 As shown, the present invention provides a gas-water two-phase flow-induced coal powder start-up migration visualizati...

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

No PUM Login to View More

Abstract

The invention belongs to the technical field of coal bed gas development, and discloses a gas-water two-phase flow induced crack pulverized coal starting migration visualization system and method, and the visualization system comprises a micro-flow unit and a crack width adjusting device. The micro-flow unit is a cuboid coal rock slice containing an artificial fracture, the periphery of the micro-flow unit is wrapped with a silicon rubber layer, and the artificial fracture is prepared by adopting a three-point bending method; the seam width adjusting device is composed of a rock clamping device and a spiral positioner. The width of the artificial fracture is adjusted through the spiral positioner, a complex rock core clamping system is not needed, operation is easy and convenient, and cost is low; by means of a laser confocal microscopic imaging technology, visual characterization and quantitative analysis of the starting migration behavior of the pulverized coal in the gas-water two-phase flow induced fracture can be realized; the micro-flow unit provided by the invention can be repeatedly used, so that research on the influence rule of gas and liquid phase apparent velocity, two-phase flow pattern, crack width, pulverized coal size fraction and pulverized coal type on the pulverized coal starting migration behavior is facilitated, and the experiment system has more powerful functions.

Description

technical field [0001] The invention belongs to the technical field of coal bed gas development, and in particular relates to a visualization system and method for starting and migrating pulverized coal induced by gas-water two-phase flow in coal seam fissures. Background technique [0002] At present, coal rock has the characteristics of hard texture, but brittle and easy to break. Its compressive / tensile strength is low and Poisson's ratio is large. Minimal stress disturbance will induce changes in coal rock structure and lead to coal dust particles. During the drainage process of coalbed methane wells, coal powder starts-migrates with the fluid, which will not only block the seepage channels (cleats / cracks and support fractures), damage the permeability of coal seams, but also induce wellbore blockage, buried pumps, stuck pumps, Problems such as pump leakage have seriously damaged the continuous, stable and efficient drainage of coalbed methane wells. Field tests show th...

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): G01N1/28G01N21/64G01N21/03E21B47/002
CPCG01N1/28G01N21/64G01N21/03E21B47/002G01N2021/0346
Inventor 皇凡生董长银周博王超杰
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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