A hydraulic shearing sampling drilling tool

Abstract

The invention relates to a hydraulic shearing type sampling drilling tool which comprises an outer sampling pipe assembly and an inner sampling pipe assembly arranged in the outer sampling pipe assembly, wherein the outer sampling pipe assembly comprises an upper joint, an upper centering device, an outer pipe joint, an outer sampling pipe, a lower centering device and a drill bit which are sequentially arranged from top to bottom; and the inner sampling pipe assembly comprises a suspending system, a guiding system and a press sampling pipe assembly, the guiding system and the press sampling pipe assembly are positioned below the suspending system, and the press sampling pipe assembly can slide up and down in a sealing manner along the inner wall of an outer sampling pipe (30) and the guiding system. The hydraulic shearing type sampling drilling tool provided by the invention has capabilities of effectively solving the sampling problem under conditions of broken grounds such as sea and land water areas and the like and greatly improving quality of samples and increasing sampling efficiency.

Description

technical field [0001] The invention relates to a hydraulic shearing sampling drilling tool, which is used for exploration and sampling drilling in soft formation conditions such as ocean and land waters. It belongs to the technical fields of geology, petroleum and marine exploration. Background technique [0002] At present, with the needs of resource exploration and scientific research, the workload of sampling in soft formations such as oceans and land waters is also increasing. The quality of samples determines the accuracy and scientificity of analysis and research on formations and their components. [0003] The conventional sampling method mainly adopts rotary sampling, that is, the drilling equipment drives the drill pipe and sampling drilling tool to rotate, thereby cutting the formation and extracting samples. The sampling tube can be single or double. This method is mainly suitable for hard formations. It is easy to cause disturbance, damage and shedding of sampl...

AI Technical Summary

Problems solved by technology

[0003] The conventional sampling method mainly adopts rotary sampling, that is, the drilling equipment drives the drill pipe and sampling drilling tool to rotate, thereby cutting the formation and extracting samples. The sampling tube can be single or double. This method is mainly suitable for hard formations. It is easy to cause disturbance, damage and shedding of samples when used in soft formation conditions, and even empty pipes

[0004] Another method is to use a mechanically pressurized drilling tool. Its working principle is to apply pressure to the drill pipe through the drilling equipment, and then the drill pipe transmits pressure to the sampling drilling tool to press the sampling drilling tool into the soft formation, but this method is easy. It will cause bending or even breaking of the drill pipe, and it can only be used in shallow formations, which is greatly limited in application

[0005] The existing various sampling tools generally have problems such as difficult sampling and low efficiency in soft formation conditions such as oceans and land waters. At the same time, samples are often disturbed during the sampling process, making it difficult to obtain high-quality samples.

Another problem with traditional sampling drilling tools is that it takes a long time to disassemble and assemble the sampling mechanism of the sampling drilling tool and the efficiency is low

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