Wire-line coring off-axis anti-inclination drilling tool

Abstract

The invention relates to the technical field of geological detection devices, and discloses a wire-line coring off-axis anti-inclination drilling tool. The wire-line coring off-axis anti-inclination drilling tool comprises a drilling column, an inner core barrel located in the drilling column and a fisher used for fishing the inner core barrel, a drill bit is arranged at the bottom of the drilling column, a water connector is arranged at the top of the drilling column, a fishing spearhead is arranged at the top of the inner core barrel. The fisher comprises an outer pipe, an elastic lock cylinder is slidably arranged in an inner cavity of the outer pipe, a pressure applying column for extruding the elastic lock cylinder is slidably clamped in the inner cavity of the outer pipe, a clamping piece for locking the fishing spearhead is further arranged in the inner cavity of the outer pipe, and the inner wall of the elastic lock cylinder slidably extrudes the clamping piece. The pressure applying column presses the elastic lock cylinder so that the clamping piece can be separated from a locking position. According to the wire-line coring off-axis anti-inclination drilling tool, the fisher can be separated from the fishing spearhead without recovering the fisher to a wellhead, separating can be achieved in the drilling column, the operation process is simple and effective, so that the fisher can be taken out very easily.

Description

technical field [0001] The invention relates to the technical field of geological detection devices, in particular to an off-axis anti-tilt drilling tool for rope coring. Background technique [0002] In terms of geological exploration, researchers need to collect the soil under the surface, and the device used is a rope core drilling tool. During the process, when the core tube is full or the core is blocked, it is not necessary to lift the entire drill string in the hole to the surface, but the inner core tube is salvaged from the drill string with a wire rope by means of a special fishing tool. [0003] The methods of rope coring include vertical drilling, horizontal drilling and inclined drilling. No matter which method is used, in order to complete the rope coring smoothly, it is necessary to ensure that the drilling tool avoids deviation during the working process. The phenomenon of axis tilting, for this reason, most of the existing wireline core drilling tools are o...

AI Technical Summary

Problems solved by technology

[0004]During the drilling process, the phenomenon of drill burning is often caused by improper operation or drilling fluid system failure, so that the inner core tube is stuck in the drill string In this case, it is necessary to recover the drill string to the wellhead and then take out the inner core tube. At this time, the overshot is located in the drill string and is stuck with the fishing spearhead on the top of the inner core tube. If the overshot is not taken out of the drill string in time It will seriously hinder the recovery of the drill string, and in the prior art, the overshot cannot be easily and effectively separated from the fishing spearhead in the drill string, making it very difficult to take out the overshot

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