Method for determining nuclear magnetic resonance T2 cutoff value and fluid saturation of tight oil, and apparatus thereof

A technology of nuclear magnetic resonance and determining methods, which is applied in the field of oil exploration, and can solve problems such as inaccuracy and difficult quantitative correspondence of centrifugal force

Active Publication Date: 2015-07-15
PETROCHINA CO LTD
View PDF10 Cites 22 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] It can be seen that there are many inaccuracies in the actual centrifuge experiment when dealing with tight oil, especially samples with strong pore heterogeneity.
The centrifugal force in the centrifugal experiment needs to be large enough to centrifuge t

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 determining nuclear magnetic resonance T2 cutoff value and fluid saturation of tight oil, and apparatus thereof
  • Method for determining nuclear magnetic resonance T2 cutoff value and fluid saturation of tight oil, and apparatus thereof
  • Method for determining nuclear magnetic resonance T2 cutoff value and fluid saturation of tight oil, and apparatus thereof

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach

[0080] The experiment of tight oil well R59 well S121 in Fuyu reservoir of Jilin Oilfield was taken as an example. The experimental data of the lower limit value of the pore throat radius of movable fluid in tight oil are as follows: point 1: roar radius 110nm, carbon content 36%; point 2: roar radius 88nm, carbon content 24%; point 3: roar radius Radius 76nm, carbon content 15%; No. 4 point: radius 42nm, carbon content 7%; Point 5: radius 18nm, carbon content 0%. The average value of 42nm and 18nm, 30nm, is taken as the lower limit of the pore throat radius of the movable fluid in tight oil. NMR T 2 The spectral core relaxation rate is taken as 15 μm / s, and the core relaxation rate is generally an empirical value. The empirical value of relaxation rate of sandstone is generally 15 μm / s.

[0081] The lower limit of the pore throat radius is 30nm, and the corresponding T2 cut-off value is 1.5ms ( Image 6 ).

[0082] Predecessors against T 2 The cut-off values ​​are exten...

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 nuclear magnetic resonance T2 cutoff value and the fluid saturation of tight oil, and an apparatus thereof. The method comprises the following steps: determining the carbon content of a sample to be measured to generate a carbon content determination result; determining the lower limit value of the pore throat radius of the sample to be measured according to the carbon content determination result; and determining the corresponding T2 cutoff value according to the lower limit value of the pore throat radius and the core relaxation rate of the sample to be measured. The T2 cutoff value is calculated by using the lower limit value of the pore throat radius of the tight oil movable fluid of the practical sample in the above scheme, and the lower limit value of the pore throat radius of the tight oil movable fluid of the practical sample is determined by adopting a course to fine pore throat carbon content gradual approximation technology, so the T2 cutoff value obtained in the invention is true.

Description

technical field [0001] The invention relates to the technical field of petroleum exploration, specifically tight oil nuclear magnetic resonance T 2 Method and device for determining cut-off value and fluid saturation. Background technique [0002] Nuclear Magnetic Resonance (NMR) is an important technique for monitoring the saturation of movable fluid in rocks. The T2 relaxation time spectrum in the NMR experiment contains information about the distribution of the rock pore structure and the fluid contained in it, which is the basis for the NMR experiment to determine the saturation of the movable fluid in the rock. The T2 distribution is related to the pore size. The movable fluid in larger pores has a weak interaction force with the rock pore solid surface, and the T2 relaxation time is relatively long. In contrast, the bound fluid has a strong interaction force with the rock pore solid surface, and the T2 relaxation time is small. [0003] The study of T2 cut-off value...

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): G01N24/08
Inventor 邹才能公言杰刘可禹柳少波朱如凯姜林袁选俊陶士振
Owner PETROCHINA CO LTD
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
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap