Coring drilling tool single-action device for preventing following moving of internal assembly

Abstract

The invention provides a coring drilling tool single-action device for preventing following moving of an internal assembly and belongs to the technical field of geological core drilling. The coring drilling tool single-action device for preventing following moving of the internal assembly is composed of an upper connector, a reverse mechanism, a bearing cavity, single-action bearings and a mandrel; the upper connector and the bearing cavity are assembled in a threaded connection mode; the mandrel is installed in the bearing cavity through the two rows of single-action bearings on the upper portion and the lower portion; and the reverse mechanism is composed of a drum-shaped shell and a reverse impeller fixed in an inner cavity of the shell, the shell is sleeved with a central hole of the upper connector in a clearance fit mode, and the lower end of shell is connected with the mandrel through a reverse threaded structure. The coring drilling tool single-action device for preventing following moving of the internal assembly is simple in structure, low in manufacturing cost and convenient to promote and does not influence the structure of a drilling tool so that the core quality can be greatly improved, the core recovery rate can be greatly increased, footage per round trip can be increased, and drilling benefits can be improved.

Description

technical field [0001] The invention relates to a core drilling tool, in particular to a single-action device for a core drilling tool capable of preventing an inner assembly from following, and belongs to the technical field of geological core drilling. Background technique [0002] In the field of geological core drilling, during core drilling operations, it often happens that the inner assembly of the core drilling tool follows the outer assembly (that is, the high-speed rotating outer assembly drives the inner assembly to rotate in the same direction at a certain speed) . During coring drilling, the outer assembly of the drilling tool rotates at high speed, the rolling friction resistance F1 exists in the single-action bearing, and the drilling fluid between the inner and outer assemblies also has the friction resistance F2. The main reason is the movement, and the higher the speed of the drilling tool, the more serious the phenomenon of following movement. The phenome...

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Problems solved by technology

[0003] In the process of coring drilling, the following movement of the inner assembly is a harmful phenomenon. On the one hand, it will cause the core to break, reduce the original shape of the core, and increase the difficulty of core utilization; Footage and core rate, thereby reducing drilling efficiency and increasing engineering costs

In view of the above problems, the traditional solution is to passively increase the lubricity of the mud to reduce the frictional resistance F2 of the drilling fluid between the inner and outer assemblies, thereby weakening the following phenomenon, but this not only increases the cost of core drilling, Can not fundamentally eliminate the phenomenon of internal assembly follow-up

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