Clear water pressing type contamination-resisting downhole video camera

Abstract

The invention provides a clear water pressing type contamination-resisting downhole video camera. The clear water pressing type contamination-resisting downhole camera comprises a cable head, a centralizer and a camera pup joint which are in sequential sealing connection. A camera is arranged at the front end of the camera pup joint. A sealed and communicated circuit channel is formed by the middles of the cable head, the centralizer and the camera pup joint, and a sealed liquid flowing channel is formed outside the circuit channel. A circuit board is arranged in the circuit channel and is electrically connected with the camera through an electric circuit and the circuit channel. An oil-well outer pumping device pumps clear water to a clear-water liquid column cavity at the front end of the camera pup joint via the liquid flowing channel, a clear-water liquid column is formed at the front end of the camera, oil dirt and the like are prevented from contaminating the camera to achieve contamination prevention effect, and clear videos can be effectively acquired in oil wells low in water content.

Description

technical field [0001] The invention relates to a camera capable of real-time observation of downhole conditions, in particular to a clean water pressure and anti-pollution downhole camera, which is especially suitable for the technical field of petroleum well logging. Background technique [0002] The downhole camera is a test instrument that uses a visible light camera to view oil, gas, and water wells. Through this instrument, the casing damage, casing dislocation, downhole falling objects, perforation quality, and water injection effective direction of the measured well can be directly observed. Condition. [0003] However, this technology has not been widely used in production practice at present, mainly due to the long downhole distance and the influence of well wall attachments during use. Staying on the axis of the well will result in an incomplete shot; on the other hand. Since oil, wax and other dirt are often attached to the well wall, the known downhole camera ...

AI Technical Summary

Problems solved by technology

[0003] However, this technology has not been widely used in production practice at present, mainly due to the long downhole distance and the influence of well wall attachments during use. Keeping on the axis of the well will result in incomplete shooting; on the other hand

Since oil, wax and other dirt are often attached to the well wall, the known downhole camera devices cannot avoid the contamination of the lens by these dirt, which will affect the clarity of the image

In addition, when the camera lens comes into contact with the above-mentioned dirt, it cannot be cleaned underground, thus affecting the accuracy of the test results

Therefore, the ubiquitous problem of camera lens contamination in downhole cameras has greatly affected the popularization and application of this technology.

[0004] Since there is no effective solution to the anti-contamination of the camera lens at present, for high-yield wells with low water cut, the camera is blocked by crude oil, and the test success rate is low. Therefore, there is no downhole camera that prevents oil pollution and can be directly used in the downhole imaging test of oil wells. superior

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