Permeability evaluation method for hydrate-bearing sediment

US11781428B1 · kind B1 · utility

Assignee

• CHINA UNIVERSITY OF PETROLEUM (EAST CHINA) · CN

Inventors

• Lanchang Xing · Qingdao, CN
• Shuo Wang · Jinan, CN
• Huanhuan Zhang · Beijing, CN
• Bin Wang · Beijing, CN
• Zhoutuo Wei · Dongying, CN
• Xinmin Ge · Qingdao, CN
• Shaogui Deng · Dongying, CN

Key dates

• Filing date: Mar 13, 2023
• Grant date: Oct 10, 2023
• Expiry date: Mar 13, 2043

Classification

• Technology area (CPC E): Fixed Constructions
• CPC primary: E21B41/0099
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

The present application relates to a permeability evaluation method for hydrate-bearing sediment, including a complex conductivity spectrum obtaining step, a hydrate saturation calculating step based on the spectrum, a formation factor calculating step based on Archie's first law or from the complex conductivity real part, imaginary part and a conductivity of pore water; and a permeability calculating step based on relaxation time, hydrate saturation, hydrate occurrence mode correction factor and formation factor, or based on the polarization amplitude, hydrate saturation, occurrence mode correction factor and formation factor, or based on the CEC, hydrate saturation and occurrence mode correction factor, or based on the pore radius, fractal dimension, hydrate saturation and occurrence mode correction factor. The application allows a large measuring range, low cost and high accuracy, and can accurately obtain the permeability of hydrate-bearing sediment and effectively reflect the micro-pore structure thereof.