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

A Method for Characterizing the Wettability of Heterogeneously Wetted Porous Media Using NMR Technique

A technology of porous media and nuclear magnetic resonance, applied in the analysis of nuclear magnetic resonance, material analysis through resonance, surface/boundary effects, etc., can solve the difficulty of measuring wettability, improve oil recovery, and can not wet the porous medium And other issues

Active Publication Date: 2020-03-27
CHINA UNIV OF PETROLEUM (BEIJING)
View PDF11 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to factors such as complex pore structures, heterogeneous wetting, and distribution of multiphase fluids, wettability measurement is still a challenge.
At present, many scholars have proposed the method of applying NMR to study wettability, but the wettability index given by them cannot be directly used to describe the wettability of porous media because it ignores the wetting strength of each wet spot. It cannot be used directly to enhance oil recovery

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
  • A Method for Characterizing the Wettability of Heterogeneously Wetted Porous Media Using NMR Technique
  • A Method for Characterizing the Wettability of Heterogeneously Wetted Porous Media Using NMR Technique
  • A Method for Characterizing the Wettability of Heterogeneously Wetted Porous Media Using NMR Technique

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] What the rock sample of embodiment 1 adopts is that water and oil (light oil, viscosity is 7cp) saturation are the neutral wetting rock sample of 50%, the rock sample that other embodiment 2-6 adopts all is the embodiment After the rock sample of 1 was treated with oil, the rock sample whose wettability changed regularly was obtained.

[0063] Example 1

[0064] This example is used to illustrate the method for characterizing the wettability of heterogeneously wetted porous media using nuclear magnetic resonance technology of the present invention.

[0065] (1) A rock sample with pores is saturated with water and oil (light oil, viscosity 7cp) to obtain a heterogeneous wetted porous medium with a saturation of 50% in water and oil (light oil, viscosity 7cp) ;

[0066] (2) IR-CPMG pulse sequence using nuclear magnetic resonance (such as figure 1 sequence shown) to measure the D-T of this heterogeneous wetted porous media 2 Distribution and T 1 / T 2 ratio;

[0067]...

Embodiment 2-6

[0087] This example is used to illustrate the method for characterizing the wettability of heterogeneously wetted porous media using nuclear magnetic resonance technology of the present invention.

[0088] According to the method described in Example 1, the difference is that the rock samples with pores are saturated with water and oil with different degrees. The results are shown in Table 1.

[0089] Table 1

[0090] Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 cos(θ 1 )

[0091] Note: T of water 1 / T 2 Indicates the T resulting from water contact wetting spots 1 / T 2 , oil T 1 / T 2 Indicates the T produced by light oil contact wetting spots 1 / T 2 , f 2 Indicates that the wetting angle is θ 2 The proportion of wetted spots, that is, f 2 =1-f 1 .

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 relates to the field of wettability characterization of a heterogeneous wetted porous media and particularly relates to a method for characterizing the wettability of a heterogeneous wetted porous media by a nuclear magnetic resonance technique. The method comprises saturating a porous medium with a first fluid and a second fluid, measuring D-T2 distribution and T1 / T2 by a nuclear magnetic resonance technique, acquiring an effective surface relaxation rate and a ratio of wet spots, wetting a homogeneous porous media with a third fluid, measuring a T1 / T2 ratio through a nuclear magnetic resonance technique, grinding the media into a sheet, measuring a wetting angle of the sheet to obtain a linear relationship of T1 / T2 and the wetting angle to obtain a wetting angle value, andcalculating a visible wetting angle of the heterogeneous wetted porous media according to the wetting angle value and the ratio of wet spots, wherein the visible wetting angle can characterize wettability. The method is an accurate and comprehensive porous media wettability evaluating method using the visible wetting angle to characterize wettability and utilizing nuclear magnetic resonance to acquire the area ratio of wet spots and wetting intensity.

Description

technical field [0001] The invention relates to the field of wettability characterization of heterogeneously wetted porous media, in particular to a method for characterizing the wettability of heterogeneously wetted porous media by nuclear magnetic resonance technology. Background technique [0002] The interaction between fluid and solid surface comes from the interaction force between fluid and solid surface, including van der Waals force, structural force and electronic force. These forces result in different distributions of the fluid on the solid surface of the porous media. The adsorption or distribution of one phase fluid in another immiscible fluid on the solid surface is called wettability. Wettability is mainly divided into homogeneous wetting and heterogeneous wetting according to the properties of the solid surface. The difference between homogeneous wetting and heterogeneous wetting is that heterogeneous wetting has different composition of wetted spots. The...

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 Patents(China)
IPC IPC(8): G01N13/00G01N24/08
CPCG01N13/00G01N24/081
Inventor 肖立志王杰崔宇诗廖广志
Owner CHINA UNIV OF PETROLEUM (BEIJING)