一种用于水平井小流量注水的主动加热分布式光纤温度监测方法及监测装置
By applying controllable thermal excitation inside the wellbore and combining it with a distributed fiber optic temperature measurement system and a one-dimensional convection-diffusion-heat transfer model, the problem of inconspicuous temperature anomalies in horizontal well injection water is solved. This enables accurate identification and quantitative analysis of background flow and injection flow, and is suitable for monitoring low-flow-rate water injection in horizontal wells.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SANYA MARINE OIL & GAS RESEARCH INSTITUTE NORTHEAST PETROLEUM UNIVERSITY
- Filing Date
- 2026-04-24
- Publication Date
- 2026-07-17
AI Technical Summary
In horizontal well water injection monitoring, existing distributed fiber optic passive temperature measurement technology has limitations due to the small temperature difference between the injected fluid and the wellbore/formation, weak thermal disturbance in the wellbore, and low background flow velocity. This results in inconspicuous temperature anomalies along the flow path, making it difficult to accurately identify background flow and injection flow, uneven water distribution, and short-circuit crossflow.
By applying controllable thermal excitation inside the wellbore and collecting temperature response signals using a distributed fiber optic temperature measurement system, the correspondence between temperature response characteristics and wellbore background flow, injection flow and its flow distribution is established. A one-dimensional convection-diffusion-heat transfer model is then used for fitting and inversion to achieve the identification and quantitative analysis of background flow and injection status in horizontal wells.
It improves the flow identification capability under weak temperature difference and low flow rate conditions, and can continuously identify uneven water distribution, local water injection abnormalities and short-circuit crossflow. It provides a rapid quantitative calibration method. The device has a clear structure and convenient operating condition control, and has good feasibility and engineering promotion value.
Smart Images
Figure CN122084149B_ABST