Quantitative Investigation of Water Sensitivity and Water Locking Damages on a Low-Permeability Reservoir Using the Core Flooding Experiment and NMR Test

• DOI: 10.1021/acsomega.1c06293
• Publication Date: 2022-01-25T20:51:04Z
• Authors: Yizheng Li; Guancheng Jiang; Xiaoqing Li; Lili Yang
• Keywords: Water flooding; Saturation (graph theory)

Production of oil and gas energy is often greatly hindered by reservoir formation damage, particularly the occurrences water sensitivity locking damages on a low-permeability reservoir. For purpose this paper, damage assessment methodology combining core flooding experiment NMR (nuclear magnetic resonance) T2 relaxation tests performed applied to quantitatively determine sensitivity/water sandstone formation. XRD are used analyze mineral composition cores. Core experiments designed simulate two permeability reduction. introduced compare saturation before after through rock cores, calculate porosity changes pore size, mechanism damages. Also, SEM morphology damage. Low-permeability cores cored from Jilantai assessed whole set experiments. The results demonstrate that samples strongly decrease with occurrence reflecting has strong prone be damaged locking. Compared previous ideas, much attention given microchanges using fluorinated instead kerosene can help observe distribution in each spectra.