Downhole optical fiber imaging camera

Abstract

The invention relates to a downhole optical fiber imaging camera mainly comprising a remote transmission unit, a video compression unit, a storage unit, an imaging unit and a lighting unit, wherein the imaging unit comprises a front view camera and a side view camera, the two cameras have corresponding light sources, an in-well image is converged into an imaging optical fiber by a lens, the in-well image is restored on a photosensitive chip through the lens at the other end of the optical fiber, the photosensitive chip outputs a front view image and a side view image after performing digitization, a video compression module performs video compression on the images, the compressed video images are transmitted by the video compression unit to a ground system through a logging cable in the form of digitized images at a speed of two frames per second, and the digitized images are stored in the storage unit at a speed of 25-30 frames per second and are read out on the ground after the instrument is lift out from the wellhead. Due to the use of the imaging optical fiber, the photosensitive chip is away from a heating light source, which is conducive to improving the working temperature of the instrument, and moreover, the volume of the side view camera is further reduced, so that the instrument structure is further simplified.

Description

Technical field [0001] The invention relates to the technical field of petroleum and exploration, in particular to a storage type optical fiber imaging downhole camera instrument, which is applied in an open hole or a casing well. Background technique [0002] The existing downhole cameras mainly include the following two types: separate storage type downhole cameras, which cannot upload pictures, and cannot observe downhole conditions on the ground. Moreover, the design structure of the lighting module and the photosensitive chip together causes the working temperature of the instrument to deviate. Low, not suitable for operations in deep wells or in bad well conditions; downhole cameras using optical fiber cable transmission can upload videos in real time, but optical fiber cables are also required, and the downhole cost is high. The existing lighting unit shoots directly in front of the camera, which may cause reflection of particles in the front and the camera's light measure...

AI Technical Summary

Problems solved by technology

[0002] The existing downhole cameras mainly include the following two types: the downhole camera with independent storage cannot upload pictures, and the downhole conditions cannot be observed on the ground, and the design structure of the lighting module and the photosensitive chip together causes the working temperature of the instrument to be high. Low, not suitable for operations in deep wells or in harsh well conditions; downhole cameras that use optical fiber cable transmission can upload video in real time, but fiber optic cables need to be prepared, and the cost of going downhole is high

The existing lighting unit is directly in front of the camera, which may cause reflections from the front particles, and the camera’s light metering is inaccurate

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