Fiber CCL (Fiber Conduit Clamp Locator)

Overview
The telescopic sensing technology based on Fabry Perot cavity can achieve high-precision, passive, high-temperature and high-pressure underground monitoring, and can be used for calibrating the depth of optical cable entering the well.
Fiber Fabry Perot cavity is a high-precision sensing technology based on optical interference. Its basic structure consists of two semi reflective mirrors, and light reflects and interferes multiple times between the two mirrors, forming an interference signal related to the cavity length. When the length of the Fabry Perot cavity changes with the external environment, the reflected light signal undergoes a phase change, and external parameters can be measured by detecting the drift of the interference signal.
In the application of oilfield casing coupling monitoring, the fiber Fabry Perot cavity can be used as an axial displacement sensor, installed at the end of the cable entering the well. When passing through the casing coupling, the device body will deform and the cavity length will also change slightly accordingly. Due to the sensitivity of the interference signal of the Fabry Perot cavity to changes in cavity length, it can detect deformations at the micrometer or even nanometer level, thus achieving high-precision measurement. By demodulating the drift of the optical fiber reflection spectrum on the ground, the optical signal changes of the Fabry Perot cavity can be recorded at different depths of the well and matched with the known wellbore structure information, thereby accurately calibrating the depth of the optical cable underground.
Fiber CCL can replace traditional CCL in fiber optic cable drilling, reducing the weight and complexity of the drilling tool string. By cooperating with fiber optic pressure gauges, it can form a fully optical production logging system, achieving barrier free measurement in high temperature and high pressure environments.

Product details 
——Core components
▪ Fiber Fabry Perot cavity sensing head: A stable interference cavity is formed by coupling a highly reflective lens with an optical fiber.
▪ High temperature and high pressure packaging: using special alloy materials for packaging, suitable for underground high temperature (>150 ° C) and high pressure (>100MPa) environments.
▪ Fiber optic transmission system: using low loss optical fibers to ensure stable long-distance signal transmission.
▪ Ground demodulator: used for real-time analysis of optical interference signals and extraction of underground deformation data.

Application scenarios and advantages
——Calibration of depth of fiber optic cable entering the well
▪ Solve the depth calculation during the process of fiber optic cable entering the well and improve the integrity of the optical logging system.
▪ Due to its advantages of small size, light weight, and wide applicability, it can be applied to deep wells, high-temperature wells, and complex wells, reducing measurement uncertainty.
▪ In the oilfield fiber optic sensing system, it can be combined with optical cables, oil connections, and fiber optic systems to improve the reliability of the overall optical production logging system, reduce manual calibration costs and difficulties.

——Other potential applications
▪ Stratum movement monitoring: installed in the slip zone of the stratum to detect small deformations.
▪ Stability analysis of drilling wellbore: detecting wellbore deformation during drilling process and optimizing wellbore structure.
▪ Earthquake monitoring: used for microseismic detection and analysis of fault activity.

Share：

To list