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

Method for evaluating shale gas adsorption through coal/shale ultrahigh pressure gas absorption and seepage experiment

A gas adsorption and ultra-high pressure technology, which is applied in the fields of permeability/surface area analysis, suspension and porous material analysis, measuring devices, etc. It can solve problems such as deviation, inability to change core water content, and inability to imitate the physical conditions of high-temperature and high-pressure formations.

Pending Publication Date: 2017-07-21
SOUTHWEST PETROLEUM UNIV
View PDF8 Cites 42 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a coal / shale ultra-high pressure gas adsorption and percolation experiment evaluation method for shale gas adsorption, aiming to solve the problem that existing instruments for measuring shale gas adsorption have single functions and cannot change the water content of rock cores. It cannot imitate the physical conditions of high temperature and high pressure strata, so that the measured data has a large deviation from the corresponding data in the real stratum

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
  • Method for evaluating shale gas adsorption through coal/shale ultrahigh pressure gas absorption and seepage experiment
  • Method for evaluating shale gas adsorption through coal/shale ultrahigh pressure gas absorption and seepage experiment
  • Method for evaluating shale gas adsorption through coal/shale ultrahigh pressure gas absorption and seepage experiment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0125] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0126] The present invention realizes multifunctionality, under certain conditions, the permeability of the rock core can be measured, the connection of the device can be changed, and the change of the adsorption amount of the rock core in different states can be measured; it lies in changing different experimental conditions, measuring the adsorption amount of the rock core, thereby establishing different Physical factors, including the water content of the core, temperature, pressure, etc., affect the adsorption capacity.

[0127] The application principle of the present invention will be described in detail below in conj...

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 discloses a method for evaluating shale gas adsorption through a coal / shale ultrahigh pressure gas absorption and seepage experiment. The method comprises the steps that a core is selected and put in a sample cylinder, a confining pressure pump is started to make the sample cylinder reach an experimental confining pressure, and vacuumizing is performed; the temperatures of the sample cylinder and a reference cylinder are stabilized at experimental temperature; helium gas is injected into the reference cylinder, and the pressure of the reference cylinder is measured; after the reference cylinder and the sample cylinder are balanced in pressure, the pressure of the sample cylinder is measured; the pressure of the reference cylinder is increased sequentially, and free space volume measurement of the sample cylinder is completed; systematic vacuumizing is performed; water steam is injected into the sample cylinder; methane having set pressure is injected into the reference cylinder, and the pressure of the reference cylinder is acquired; a balancing valve is turned on, and the pressure of the sample cylinder is acquired; the pressure of the reference cylinder is increased sequentially, and the shale gas adsorption experiment is completed under certain water saturation. By adopting the method, the porosity, the permeability, the adsorbing capacity and gas-water seepage of the experimental core, electrical resistivity change of the core in the experimental process and the influence of different water saturations on absorption and desorption amounts can be respectively measured.

Description

technical field [0001] The invention belongs to the technical field of shale gas adsorption, in particular to a coal / shale ultra-high pressure gas adsorption and seepage test evaluation method for shale gas adsorption. Background technique [0002] It is known that shale has a certain porosity and can contain a certain amount of oil or natural gas. Shale gas refers to the natural gas resources contained in shale. This part of resources belongs to unconventional oil and gas reservoirs. my country's shale gas reserves have reached 31.5 trillion cubic meters, and the exploitation potential is huge. At present, the determination of the adsorption curve of shale gas mainly refers to the determination method of the isothermal adsorption curve of coalbed methane to conduct similar experiments. During the experiment, the shale was ground into 60-80 mesh powder for the isothermal adsorption experiment, resulting in damage. However, the pore structure of the original core is not clea...

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): G01N7/04G01N15/08
CPCG01N7/04G01N15/0826
Inventor 张广东温云帆刘建仪丁忠佩徐丹
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