Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for establishing low-permeability sandstone pore network model based on conventional mercury injection data

A pore network model and low-permeability technology, applied in the field of oil and gas, can solve the problems of a single capillary bundle model in the physical model, large differences in pore structure characteristics, failure to distinguish pores from throats, etc., and achieve high accuracy Effect

Active Publication Date: 2021-06-15
SOUTHWEST PETROLEUM UNIV
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the capillary bundle model established based on conventional mercury injection data is fast and simple, the physical model is a single capillary bundle model, which cannot distinguish pores from throats, and is quite different from the real pore structure characteristics.

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 establishing low-permeability sandstone pore network model based on conventional mercury injection data
  • Method for establishing low-permeability sandstone pore network model based on conventional mercury injection data
  • Method for establishing low-permeability sandstone pore network model based on conventional mercury injection data

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] Embodiment 1: as figure 1 As shown, the method of establishing a low-permeability sandstone pore network model based on conventional mercury injection data includes the following steps:

[0082] Step 1: Select the sandstone core of the research block, and carry out routine physical property experiments on the core, including: oil washing, salt washing, drying, geometric parameter measurement, referring to the core analysis method of GB / T29172-2012, using SCMS-E type high temperature and high pressure core Multi-parameter measurement system - gas porosity and permeability measuring instrument to measure the porosity of rock core and permeability K e , and the measured data are shown in Table 1.

[0083] Table 1 Core physical parameters

[0084]

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 establishing a low-permeability sandstone pore network model based on conventional mercury injection data, which comprises the following steps: carrying out a conventional physical property experiment on a sandstone core to obtain the actually measured porosity and the actually measured permeability of the sandstone core; carrying out a conventional mercury injection experiment to obtain a mercury injection saturation increment and a mercury removal saturation increment under the pressure of two adjacent capillary tubes; according to an equal-diameter sphere accumulation principle, giving a value of a pore structure parameter average pore-throat ratio; calculating relevant parameters of each stage of pore throat capillary under the control of different capillary pressures; establishing a porosity, permeability and permeability contribution rate calculation model of the pore throat capillary bundle model by adopting a multidisciplinary crossing method; and finally, comparing experimental data with a theoretical calculation result through an experimental test, and verifying the effectiveness of the model. The defect that conventional mercury injection data can only simplify a low-permeability sandstone pore network into an equal-diameter straight capillary bundle model is overcome, pore channels and throats are distinguished, and the authenticity of the model is guaranteed.

Description

technical field [0001] The invention relates to the field of petroleum and natural gas, in particular to a method for establishing a low-permeability sandstone pore network model based on conventional mercury intrusion data. Background technique [0002] The pore structure characteristics of rocks are the main factors affecting the physical properties and seepage capacity of reservoirs. Accurately characterizing the pore structure characteristics of rocks is the key to improving the productivity of oil and gas reservoirs. Due to the complexity, diversity and randomness of rock pore structure, it brings great difficulties to the study of pore structure characteristics. Therefore, it is very important to establish a pore network model that is equivalent to real core pore-permeability properties, includes pore geometric features, and has a regular topology. Up to now, the developed pore network models include capillary bundle model, pipe network model and Micro-CT based digita...

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): G06F30/28G01N15/08G06F113/08G06F119/04
CPCG01N15/0826G01N15/088G06F30/28G06F2113/08G06F2119/04
Inventor 袁媛孟英峰唐波苏晓明李皋张聪聪
Owner SOUTHWEST PETROLEUM UNIV