Construction method of optical fiber television logging instrument for detecting fish top detection

Abstract

A well-logging method by optical-fiber television system includes such step as lowering oil pipe down to a target position, lifting it up by 0.4-0.5 m, installing well sealing unit, lowering a visual-light well logger down in said oil pipe while filling hot water, decreasing the lowering-down speed when the distance from the well logger to target position is 50 m, observing the water transparency, filling clean water if the water is cloudy, continuously lowering the logger down, repeating previous two steps until the logger reaches born position, and beginning well logging.

Description

Technical field: [0001] The invention relates to a downhole construction method used in the field of oilfield logging, in particular to a construction method for detecting fish tops by using optical fiber television logging. Background technique: [0002] Optical fiber television logging mainly uses visible light imaging to detect the condition of the fish top and well wall, so it requires a high degree of clarity of the medium in the wellbore. However, the logging process used now is very simple, that is, first a large amount of water is injected to wash the well twice, and then the fiber optic television logging tool is inserted into the casing to observe the target position, and the logging process does not continue according to the actual situation. rinse. This construction method has found the following defects in the actual logging process: It is difficult to make the definition of the medium in the well meet the requirements of the instrument by only cleaning the well befo...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the deficiency that the existing construction method of optical fiber television logging to detect fish tops is too simple and cannot guarantee the success rate of optical fiber television logging, the present invention provides a new construction method, which can overcome the inability of the old construction technology Solved the problem, effectively realized local clarity near the instrument probe, greatly improved the logging success rate and the clarity of the fish top image