Method for determining stress sensitivity of fractured low-permeability reservoir based on scale model

A stress-sensitive and stress-sensitive technology, applied in permeability/surface area analysis, measurement device, suspension and porous material analysis, etc., can solve problems such as the inability to directly describe the flow law of the reservoir

Inactive Publication Date: 2012-10-10
CHINA UNIV OF PETROLEUM (BEIJING)
View PDF2 Cites 17 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Fractured tight reservoirs have heterogeneity, stress sensitivity and anisotropy, and the core size (usually 25mm) of the stress sensitivity evaluation experiment is limited by the coring conditions and experimental co

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 stress sensitivity of fractured low-permeability reservoir based on scale model
  • Method for determining stress sensitivity of fractured low-permeability reservoir based on scale model
  • Method for determining stress sensitivity of fractured low-permeability reservoir based on scale model

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0021] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific implementations of the present invention will now be described with examples.

[0022] 1. Determine the relationship between the effective stress and permeability of porous cores and fractured cores respectively. For example, the low-permeability tight sandstones of the He 8, Shan 2 and Taiyuan Formation three reservoirs in the Ordos Basin are selected as the analysis object. According to the well depth and pressure gradient Select the net stress value for the measurement. The net stress values ​​we choose are 2, 4, 6, 10, 15, 20, 30, and 40, a total of 8 points, and the permeability values ​​of the cores under different net stresses are measured, such as figure 2 , 3, the relationship between permeability and effective stress can be expressed as a power function:

[0023] k 2 =1.54(σ e ) -0.5925 , k 3 =233.3(σ e ) -0.7445 (5)

[0024]...

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

PropertyMeasurementUnit
Diameteraaaaaaaaaa
Login to view more

Abstract

The invention relates to a method for determining stress sensitivity of a fractured low-permeability reservoir based on a scale model. According to the method, the scale model of the stress sensitivity of the fractured compact reservoir is obtained by using a rock mechanics analysis method and a medium series-parallel model. Factors such as core size, underground flowing size, fracture density, fracture occurrence and ground stress are taken into account in the scale model. A pore type core and a fractured core are tested in a stress sensitivity experiment respectively, and the stress sensitivity experimental law of the small-sized pore type core and of the fractured core is obtained by the scale model, so that the actual reservoir large-range flowing law is deduced. Besides, the method shows that effective stress in a stress sensitivity model cannot be simply equal to effective stress of a reservoir (burden pressure-pore pressure), but is equal to normal effective stress of a fractured surface. The stress sensitivity scale model provided by the invention can be used for predicting capacity, and the method is a novel method for researching capacity calculation for fractured compact reservoir horizontal wells, multi-branch horizontal wells and staged fracturing horizontal wells.

Description

technical field [0001] The invention relates to a method for determining the stress sensitivity of fractured low-permeability reservoirs, to predict the influence of factors such as stress change, fracture density, and fracture occurrence on the permeability of fractured low-permeability reservoirs, so as to determine the stress sensitivity of tight and low-permeability fractures. Provide technical guidance for productivity prediction of permissive reservoirs. Background technique [0002] my country is very rich in low-permeability oil and gas resources. As of 2009, low-permeability oil and gas reserves accounted for 27.5% of the onshore developed geological reserves, and 70.8% of the proven unproduced reserves. With the increasing demand for oil, the recoverable reserves of the easy-to-exploit medium and high-permeability oilfields will gradually decrease, and the contribution of low-permeability oilfields, including tight oilfields, to oil and gas production will increase...

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
Inventor 赵海峰张伟
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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