	US 12,422,342 B2
	Preparation method of micro-nanofluidic model of triple-medium carbonate reservoir
Qichao Lv, Beijing (CN); Rong Zheng, Beijing (CN); Chenggang Xian, Beijing (CN); Honglei Zhan, Beijing (CN); Juan Zhang, Beijing (CN); Tongke Zhou, Beijing (CN); Abdolhossein Hemmati-Sarapardeh, Beijing (CN); Tingting Yi, Beijing (CN); and Saeid Norouzi Apourvari, Beijing (CN)
Assigned to CHINA UNIVERSITY OF PETROLEUM—BEIJING, Beijing (CN)
Filed by CHINA UNIVERSITY OF PETROLEUM-BEIJING, Beijing (CN)
Filed on Dec. 11, 2024, as Appl. No. 18/976,628.
Claims priority of application No. 202410154853.4 (CN), filed on Feb. 2, 2024.
Prior Publication US 2025/0251322 A1, Aug. 7, 2025
Int. Cl. G01N 1/00 (2006.01); G01N 1/32 (2006.01); G01N 15/08 (2006.01); G01N 33/24 (2006.01); E21B 49/08 (2006.01)

CPC G01N 1/32 (2013.01) [G01N 15/082 (2013.01); G01N 33/24 (2013.01); E21B 49/088 (2013.01)]

9 Claims

1. A preparation method of a micro-nanofluidic model of triple-medium carbonate reservoir, comprising the following steps:

obtaining a cave structure, a fracture structure and a pore structure of a carbonate rock, and preparing a first mask, a second mask and a third mask respectively; wherein the first mask has a cave structure of the reservoir, the second mask has the cave structure and a fracture structure of the reservoir, and the third mask has the cave structure, the fracture structure and a pore structure of the reservoir;

forming at least one photoresist layer on a glass substrate, and subjecting the at least one photoresist layer to an exposure treatment and an etching treatment through the first mask, the second mask and the third mask sequentially, so that etching depth at a position corresponding to the cave structure on the glass substrate is greater than etching depth at a position of the fracture structure, and the etching depth at the position of the fracture structure is greater than etching depth at a position of the pore structure, and subjecting the at least one photoresist layer to a washing treatment, to obtain a first intermediate model; wherein the position corresponding to the cave structure on the glass substrate is etched three times, the position of the fracture structure is etched twice, and the position of the pore structure is etched once; the method uses the etching treatment three times, the first two etchings are wet etchings, and the third etching is inductively coupled plasma etching;

stacking an etched side of the first intermediate model with a glass cover to obtain a model to be bonded, placing the model to be bonded between two graphite sheets, and placing a steel plate or a corundum plate on a side of the two graphite sheets away from the model to be bonded, and then horizontally placing into a muffle furnace for a bonding treatment, to obtain a second intermediate model; wherein the bonding treatment has a temperature of 400-700° C. and time of 4-12 hours; and

introducing a first solution, a second solution and a third solution into the second intermediate model sequentially to form a calcium carbonate nanocrystalline layer and obtain the micro-nanofluidic model of triple-medium carbonate reservoir;

wherein the first solution comprises N-(trimethoxysilylpropyl) ethylenediamine triacetic acid sodium salt, and the second solution comprises Ca²⁺, and the third solution comprises CO₃²⁻.