Schlumberger Technology Corporation

Shunsuke Yamazaki

Shigeo Daito

Shunsuke Fukagawa

Tsutomu Yamate

A technique facilitates control over optical transmittance and, in some applications, the technique may be carried out without using moving mechanical parts. A system may comprise a light source and an optical fiber line, e.g. a plurality of optical fiber lines, in optical communication with the light source. An electrochromic device is positioned along each optical fiber line and may be selectively operated via electrical inputs to control optical transmittance along the corresponding optical fiber line. When plural optical fiber lines are employed, the corresponding plurality of electrochromic devices may be operated to also provide control over optical path selection. In fluid analysis operations, at least one sample chamber for receiving fluid samples may be positioned along a corresponding optical fiber line to enable analysis of light directed into the fluid sample as controlled by the corresponding electrochromic device.

System and methodology for controlling optical transmittance

A fluid analyzer of a downhole tool positionable in a wellbore penetrating a subterranean formation is provided. The wellbore has a downhole fluid thereabout. The downhole tool has a downhole flowline for receiving the downhole fluid. The fluid analyzer includes a microflowline fluidly coupled to the downhole flowline to receive the downhole fluid therethrough, a plurality of electrodes positionable in the microflowline to generate an electrical field therebetween and to vaporize the downhole fluid passing therebetween whereby plasma emissions are generated from the downhole fluid, and a plasma detector to measure plasma emissions whereby components of the fluid are detectable.

Fluid analyzer with plasma emission unit and method of using same

A fluid analyzer of a downhole tool is provided. The downhole tool is positionable in a wellbore penetrating a subterranean formation. The wellbore has a downhole fluid thereabout. The downhole tool has a housing with a flowline therethrough for receiving the downhole fluid. The fluid analyzer includes at least one optical source to pass a light through an optical window and through the downhole fluid in the flowline, at least one photodetector to measure the light passed through the downhole fluid in the flowline, and at least one optical mirror. An optical path of the light extends from the optical source to the photodetector. An optical path length is defined as a length of a portion of the optical path within the flowline. The optical mirror is positionable about the flowline, and has an optical layer selectively passing the light from the optical mirror to the photodetector whereby the optical path length may be varied.

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Yokohama, Japan

Shunsuke Yamazaki