Simultaneous fiber optics detection and cement evaluation
Publication Date: 2017-Feb-06
The IP.com Prior Art Database
Downhole identification of fiber optics position in presence of the blast protectors, utilizing Electromagnetic Acoustic Transducer technology
Title: Simultaneous fiber optics detection and cement evaluation
Abstract: Downhole identification of fiber optics position in presence of the blast protectors, utilizing Electromagnetic Acoustic Transducer technology
Description: In deviated or horizontal wells, where a fiber optic is deployed behind the casing. There is a need to perforate and frac the well, without damaging the fiber optic line. The technology could be used to continuously log the cement quality and also identify blast protectors, and locating the blast protector "back bone" where the fiber optic is located. This will be used to perforate and frac in a direction such that it does not affect the fiber optic integrity.
The physics principles are acoustic, for which the success to effectively detect the position of the "back bone" across the circumference behind the casing will be dependent on the acoustic impedance contrast between the area where the back bone is located vs. the area where there is no backbone. To help identify the back bone, it may be beneficial, as an option, to install a material (for instance, rubber) that will contrast the presence of cement, or any other borehole material (such as drilling or formation fluids).