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

Dual-medium reservoir rock water saturation calculating method based on percolation network simulation

A dual medium, percolation network technology, applied in wellbore/well components, earthwork drilling, etc., can solve the problems of poor adaptability and error of electrical logging in carbonate rocks

Active Publication Date: 2017-01-04
SOUTHWEST PETROLEUM UNIV
View PDF8 Cites 13 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0021] To sum up, the method of calculating rock water saturation by Archie’s formula has many defects in theory and logic, which leads to its poor adaptability to electrical logging of carbonate rocks. There will be large errors in the interpretation of rock oil and gas saturation

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
  • Dual-medium reservoir rock water saturation calculating method based on percolation network simulation
  • Dual-medium reservoir rock water saturation calculating method based on percolation network simulation
  • Dual-medium reservoir rock water saturation calculating method based on percolation network simulation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0137] It is known that a matrix-dissolved pore type carbonate gas reservoir section has a burial depth of 2100-2110m, a total porosity φ of 11.9%, a gas permeability k of 11.2mD, and a true formation resistivity R t = 16.64Ω·m. The formation water resistivity R of the well is known from the water analysis data w = 0.1 Ω·m. For regional rock electricity experiment data, see figure 2 and Figure 4 . Using the original method to fit the experimental data of rock electricity in the area: a=1.2173, m=1.658, b=1.0732, n=1.108. Calculate the water saturation of the carbonate reservoir interval.

[0138] (1) According to figure 1 A rock sample was cut into segments A, B and C as shown. The regional lithoelectric test data of this reservoir interval are as follows: figure 2 and Figure 4 shown. Since the reservoir is a natural gas reservoir, it can be assumed that the reservoir rock is hydrophilic.

[0139] (2) Refitting figure 2 The experimental data in, get figure 2...

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 dual-medium reservoir rock water saturation calculating method based on percolation network simulation. The method comprises the steps that (1) a rock sample is cut into a segment A, a segment B and a segment C, the segment A is subjected to a rock-electric test and a nuclear magnetic resonance test, the segment B is subjected to wettability measurement, and the segment C is subjected to a scanning electron microscope test; (2) the function relationship between the formation factor F and the porosity phi is fit; (3) constants C1 and C2 are calculated, and C1 and C2 reflect pore throat features and resistivity properties of dual-medium reservoir matrix pores; (4) the pore throat radius variable coefficient sigma of a rock dissolved pore system is worked out; (5) a dual-medium percolation network model is established, and by means of a trial-and-error method, the coordination number z of the dissolved pore system is determined through network simulation; and (6) the value of B' is determined, and the dual-medium reservoir rock water saturation S<w> is obtained. According to the method, an explanation method of logging through the electric field vector geophysical method is perfected, and the defects of theoretical knowledge of reservoir rock electrical properties and rock water saturation calculating methods are overcome.

Description

technical field [0001] The present invention relates to a method for calculating the electrical properties of dual-media oil-gas reservoir rocks and the water saturation of reservoir rocks, in particular to realize the quantitative calculation of the water saturation of oil-gas reservoir rocks based on the experimental data of rock electrical properties and electrical logging data. It is a geophysical electrical logging data interpretation method. Background technique [0002] Oil and gas resources are mainly stored in underground rock formations, such as sandstone and carbonate rocks. Both sandstone and carbonate reservoir rocks can develop as single-media or dual-media reservoirs. Here, the reservoir rock pore types mainly include pores, fractures, and dissolved pores. In the present invention, single medium refers to rocks with only pores in the pore space, and double medium refers to rocks with two types of pores, pores and dissolved pores in the pore space of rocks, a...

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): E21B49/00
CPCE21B49/00
Inventor 李闽唐雁冰赵金洲肖文联王颖李晓
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

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