Horizontal directional cohesionless soil sampling drilling tool used for unconsolidated fractured formation

Abstract

The invention discloses a horizontal directional cohesionless soil sampling drilling tool used for an unconsolidated fractured formation. The drilling tool comprises a barrel, a first coring pipe anda second coring pipe, wherein the first coring pipe and the second coring pipe are arranged symmetrically in the barrel and are of semi-cylindrical structures correspondingly. Side grooves are formedin the bottom ends of the sides, close to each other, inside the first coring pipe and the second coring pipe correspondingly. Closing mechanisms are arranged in the side grooves correspondingly. By arranging the closing mechanisms, arc-shaped baffles are kept consistent with and located in the same planes with the inner walls of the first coring pipe and the second coring pipe correspondingly under the effects of corresponding clamping blocks, after sampling is completed, the effect of closing the bottoms of the first coring pipe and the second coring pipe is achieved by uplifting the barrelslightly and then pressing cushion plates, a sample is prevented from falling off from the lower portions, disturbance in a soil sample is reduced, the formation distribution situation can be observedintuitively by placing the first coring pipe and the second coring pipe horizontally on a work surface and taking away the coring pipes thereon, and the formation stratigraphic sequence status is kept in good condition.

Description

technical field [0001] The invention relates to the technical field of sampling drilling tools, in particular to a horizontally oriented non-cohesive soil sampling drilling tool for loose and broken formations. Background technique [0002] At present, mineral resources around the world are becoming increasingly depleted, which requires drilling companies to develop mineral resources more economically and effectively. To understand the structure and direction of mineral resources in the formation, in the existing technology, when sampling the soil, it is often Sampling drilling tools such as semi-combined pipes, multi-layer pipes, and piston drilling tools are used. [0003] Most of the existing domestic drilling and sampling methods for soft and shallow soil layers are vertical drilling, and there are very few horizontal drilling and sampling. However, in the process of vertical drilling and sampling, the distribution of soil samples in the horizontal direction cannot be a...

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Problems solved by technology

[0005] 1. In the prior art, the plugging part is closed under the action of the restoring force of the spring. At the same time, the sample descends slightly under the action of gravity, forming a negative pressure on the upper part to prevent the sample from falling off from the lower part. However, there is a certain amount of gas in the formation itself. It is difficult to negative pressure absorb the sample in the tube under the condition of shaking

[0006] 2. In the prior art, the outer wall of the drilling tool is relatively smooth, which can reduce the friction coefficient when inserted into the formation, but because the outer wall of the drilling tool is relatively smooth, it is inconvenient for workers to pull out the whole

[0007] 3. In the prior art, the drilling tool has an integrated structure, and it is inconvenient to disassemble. When checking the stratum structure after sampling, it is often necessary to push the soil sample out of the drilling tool, and this operation is laborious and cumbersome.

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