A method for testing a water-pressurized downhole camera

Abstract

The invention provides a clean-water pumping type downhole camera testing method and is applicable to the technical field of oil well logging. By the clean-water pumping type downhole camera testing method, a stable clean-water liquid film is guaranteed at the front end of a camera lens, so that the camera can acquire clear downhole image data. Meanwhile, by the testing method, pumping pressure of a clean-water boosting pump and injection speed of clean water can be adjusted in real time according to downhole pressure and camera effect, so that test safety is ensured and accurate and effective image information can be obtained. Furthermore, by the testing method, downhole testing success rate can be effectively increased.

Description

technical field [0001] The invention relates to a method for testing a clear-water pressure-type downhole camera, and the method is particularly 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 devices cannot avoid the contamination of the lens by these dirt,...

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, 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 without any oil pollution and cannot be directly used for downhole imaging of oil wells. on the test

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