Fisher appliable to geological exploration and used for jaw-type rope coring drilling tool

Abstract

The invention discloses a fisher appliable to geological exploration and used for a jaw-type rope coring drilling tool. The fisher appliable to geological exploration and used for the jaw-type rope coring drilling tool comprises an ejection rod, a jaw capture cover, a support, a release hook, a guide sleeve, a trigger slide sleeve, a lifting shaft, a spring gland and a joint. The upper end of thelifting shaft is connected with the joint; the lower end of the lifting shaft is located in the support, and the spring gland is arranged at the top of the support; the release hook is hinged into a key slot of the support; the jaw capture cover is connected to the lower part of the support, the ejection rod and the guide sleeve are located in the support, and an ejection rod release spring is arranged between the guide sleeve and the support; the spring gland is arranged on the upper part of the support, and the lifting shaft is arranged in the support through a central hole of the spring gland; and the joint and the lifting shaft are arranged on the upper part of the spring gland in a manner of pin joint, the trigger slide sleeve is connected to the lower part of the joint; and the tailpart of the release hook is arranged in the trigger slide sleeve. In a process of recovering the fisher appliable to geological exploration and used for the jaw-type rope coring drilling tool, the fisher appliable to geological exploration and used for the jaw-type rope coring drilling tool has a self-separating function in the case of abnormal blockage, and is capable of realizing safe separationfrom a jaw of the drilling tool.

Description

technical field [0001] The invention relates to a jaw-type wireline coring tool overshot suitable for geological exploration. Background technique [0002] Wireline coring drilling technology has the advantages of high drilling efficiency and less disturbance to samples, and has been widely used in the field of geological exploration. At present, the top of the conventional wireline core drilling tool adopts the spearhead structure, and the spearhead is captured by the clip in the overshot and the recovery and lifting of the drill tool is completed. In the case of vertical drilling, if abnormal jamming occurs during the lifting process, the release pipe is manually put into the hole, and under the action of the impact force, the release pipe covers the tail of the overshot clip to make the clip open. Open so that the separation of the overshot and the inner pipe assembly can be realized, and the expansion of drilling accidents can be avoided. However, in the lifting of the...

AI Technical Summary

Problems solved by technology

However, when the hoist encounters jamming, this form cannot perform effective, fast, and reliable unjamming operations, which limits the wide application and promotion of claw-type wireline core drilling tools in complex formations, making its working reliability and stability decline

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