Committed to giving the most progressive service of fiber-optic frameworks including fiber optic distributed acoustic detecting and fiber-optic distributed temperature detecting frameworks.
Distributed Acoustic Sensing Technology
Distributed acoustic sensing (DAS) technology is generally utilized for detection of the acoustic signal along the length of the fiber string. The movement across the fiber allows the operator, for hydraulic fracturing operations, to determine where the fluid is moving within a particular stage. There are three components required for distributed acoustic sensing:
- Interrogator unit
- Optical fiber
- Speed of light
A signal is developed from sending a light emission down the fiber string from the surface interrogator unit. A level of scattered light results when the beam of light travels down the fiber. The reflected light is then transmitted back to the examiner unit for preparing. At the point when the fiber is made, normally happening impurities influences or heterogeneities from inside the center of the fiber when the glass cools. These impurities influences are what reflect and scatter the pulse light. This is the thing that structures the distributed acoustic sensing (DAS) application and vibroacoustic signal. Distributed acoustic sensing resolution goals are dictated by the surface interrogator unit. It is regular for a goal of 1m to be distinguished over the fiber.
Seismic Distributed Acoustic Sensing
Seismic profiling utilizing fiber-optics is an emerging innovation, that has been utilized instead of conventional surface detection gear for velocity profiling. In traditional seismic strategies, a geophone array is installed inside the vertical area of an observation wellbore. Numerous administrators are presently utilizing appropriated acoustic detecting seismic frameworks for information catch. The advantages being the prominent perception well can likewise be fracked toward the finish of the seismic undertaking bringing about littler gear impression prerequisite and generally task cost decrease. An extra advantage of running fiber is the estimation of strain fronts from counterbalance wells being fracked. This permits the administrator of the circulated acoustic detecting seismic framework to decide frac hits and cross-well correspondence with more exactness, as fiber can decide at what profundity the frac reaction was recorded.
Components of fiber-optic
- Core – This is the segment of the fiber that houses and transports the optical sign of light from the source, which is the cross-examiner. For oil and gas applications, the center is made totally of glass and goes about as one single transmission gadget. Contingent upon whether single-mode or multi-mode is picked for the circulated acoustic detecting framework, the size will change from 10 microns to more than 50 microns. The bigger the center, the more light that can be transmitted. Contingent upon whether single-mode or multi-mode is picked for the circulated acoustic detecting framework, the size will fluctuate from 10 microns to more than 50 microns. The bigger the center, the more light that can be transmitted.
- Cladding – A covering with a low refractive file, which enables the light to stay contained inside the center. Without cladding, the light inside the center would scatter, with practically zero backscatters got back at the examiner unit.
- Covering and Buffer – A defensive component for the fiber link, demonstrating security and inflexibility for link twist development.