Research and Field Practice of Moderate Mild Water Injection Technology in Low Permeability Tight Reservoir

doi:10.11885/j.issn.1674-5086.2022.03.07.02

Abstract

Abstract: In order to solve the technical problems of water phased channeling and flooding with fracture water, difficulties in recovery of matrix crude oil and low water drive recovery in ultra-low permeability tight reservoirs during water injection. In order to explore the effect of displacement rate on water drives recovery, we carry out the displacement experiment taking Chang-6 Reservoir of Ordos Basin as the research object. Then the NMR test results are analyzed, finally, the unsteady oilwater two-phase water flooding front propulsion mathematical model considering capillary force is established to form the policy method of moderate water injection technology. The results show that there is an optimal displacement rate in the process of water flooding, which makes the water flooding recovery maximum. The best displacement rate in the experiment is 0.06~0.08 mL/min. Taking the ZC Block of Yanchang Oil Production Plant as an example, moderate technical policies is adopted to control the water injection intensity in the block of 0.85~1.20 m³/(d·m), and the submergence of the oil pump is controlled at 100~150 m. After the application of the technology, production data show that the water flooding recovery is increased from 20% to 24%. Moderate mild water injection technology has a significant effect on EOR of low-permeability tight reservoir. The research results provide a reference for similar reservoirs in the process of high-efficiency water injection development.

Key words: moderate water injection, imbibition displacement dual action, water driven front model, ultra-low permeability tight reservoirs, EOR

CLC Number:

TE348

WANG Xiangzeng, GAO Tao, LIANG Quansheng, DANG Hailong. Research and Field Practice of Moderate Mild Water Injection Technology in Low Permeability Tight Reservoir[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2022, 44(4): 62-70.

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