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

Method and device for determining subsurface fracture opening and application thereof

A technology of opening degree and surface fractures, which is applied in the field of petroleum exploration and can solve the problems that natural fracture parameters cannot objectively reflect the real situation and wrong evaluation of natural fracture effects.

Active Publication Date: 2016-12-14
CHINA UNIV OF PETROLEUM (BEIJING)
View PDF2 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after the cores are taken to the surface, due to the release of formation confining pressure, there is a process of core expansion, which will cause the opening of natural fractures on the surface cores to be much larger than their real openings underground. Therefore, the fracture porosity and The permeability will be far greater than the real value of the underground, which will inevitably cause a wrong evaluation of the function of natural fractures, and the obtained parameters of natural fractures cannot objectively reflect their real conditions under the confining pressure of the formation

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 and device for determining subsurface fracture opening and application thereof
  • Method and device for determining subsurface fracture opening and application thereof
  • Method and device for determining subsurface fracture opening and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] This embodiment provides a device for determining the opening degree of underground cracks, such as figure 1 As shown, the device includes a loading system (1), a pressure control system (2) and a measurement processing system (3);

[0045] The center of the loading system (1) is a sample placement unit; the periphery of the sample placement unit is a confining pressure loading unit;

[0046] The pressure control system (2) includes a formation confining pressure control unit and an axial load control unit;

[0047] The measurement processing system (3) is used for parameter measurement, metering and post-processing of experimental data.

Embodiment 2

[0049] The present embodiment utilizes the crack opening degree distribution diagram ( figure 2 ), reflecting that as the formation confining pressure (depth) increases, the opening of fractures decreases with a negative exponential function.

[0050] Specifically:

[0051] Determine the fracture detection area, measure the static rock confining pressure in the area where the underground fracture is located at a depth of x, and calculate the opening degree e of the underground fracture according to formula I i :

[0052] e i =a f(x) +b I;

[0053] In the formula 1, f (x) represents the static rock confining pressure of the region when the fracture depth is x; the calculation formula of the f (x) is:

[0054] f ( x ) = μ 1 - μ H f ( σ v ...

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 provides a method for determining the subsurface fracture opening. The method particularly comprises the steps that a fracture detection area is determined, lithostatic confining pressure of the area where a subsurface fracture with the depth x is located is measured, and the subsurface fracture opening ei is calculated according to the formula ei=a<f(x)>+b, wherein f (x) is the lithostatic confining pressure of the area where the subsurface fracture with the depth x is located, and a and b are both fitting coefficients obtained through digital fitting. According to the technical scheme, a feasible way is provided for determining the fracture opening, porosity and permeability under the formation confining pressure condition, real distribution of the natural fracture opening, natural fracture porosity and natural fracture permeability under different formation confining pressure conditions can be restored quantificationally, and an effective means is provided for objectively and reasonably evaluating the reservoir and seepage effects and contribution of natural fractures in a compact low permeability reservoir.

Description

technical field [0001] The invention relates to the field of petroleum exploration, in particular to a method, device and application for determining the opening degree of underground fractures. Background technique [0002] Quantitative evaluation of underground opening, porosity and permeability of natural fractures are the three core parameters that reflect the role and contribution of natural fractures, and are also key parameters required for the development of fractured reservoirs. Core data is the most reliable, direct and common way to characterize the quantitative parameters of natural fractures. However, after the core is taken to the surface, due to the release of the formation confining pressure, there is a process of core expansion, which will cause the opening of the natural fractures on the surface core to be much larger than the real opening of the underground. Therefore, the fracture porosity and The permeability will be far greater than the real value of t...

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
IPC IPC(8): G01N15/08
CPCG01N15/088
Inventor 曾联波
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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