Method for judging main control factors of water drive efficiency of low-permeability reservoir based on relative permeability
By conducting unsteady-state phase permeation experiments and grey relational analysis in low-permeability reservoirs, the saturation of movable fluid, the saturation of bound water, and the starting pressure gradient were identified as the main influencing factors. This solved the problem of not being able to accurately determine the main controlling factors in existing technologies, and enabled the refined development of low-permeability reservoirs.
Patent Information
- Application Number
- CN202511422713.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-30
- Publication Date
- 2026-02-03
AI Technical Summary
Existing technologies cannot quickly and accurately identify the main controlling factors in the waterflooding development of low-permeability reservoirs, resulting in inaccurate analysis results and making it difficult to provide clear guidance for the refined development of low-permeability reservoirs.
By clarifying the target reservoir conditions, conducting unsteady-state phase permeation experiments, plotting oil-water phase permeation curves, constructing fitting formulas, and using grey relational analysis to determine the main controlling factors, the impact of each factor on oil displacement efficiency was quantified.
The study identified movable fluid saturation, bound water saturation, and initiation pressure gradient as the main influencing factors, providing precise development support for low-permeability reservoirs and avoiding subjective judgment errors in traditional methods.