Semi-open type drill rod for deposition sampling and using method of semi-open type drill rod

Abstract

The invention relates to a semi-open type drill rod for deposition sampling. The semi-open type drill rod comprises a drill rod main body and a sealing plate, wherein the drill rod main body is a cylindrical body, the side wall of the cylindrical body is provided with a notch along the length direction of the drill rod, the sealing plate is a semi-cylindrical shell, the semi-cylindrical shell matches with the notch in the drill rod main body, the semi-cylindrical shell and the notch in the drill rod main body are detachably spliced to form a closed cylindrical drill rod, a separation cutter plate is connected between the two sides of the bottom of the sealing plate, and the separation cutter plate is located in the central plane. According to the semi-open type drill rod, the sampling efficiency can be better improved, the sampling difficulty and dangerousness are reduced, the attractiveness of the section of sediment is improved, the sampling amount is increased, the cost is saved, and waste is avoided.

Description

technical field [0001] The invention relates to the technical field of sedimentary facies drilling and sampling, in particular to a semi-open drill pipe used for sedimentary sampling and a usage method thereof. Background technique [0002] Sedimentary facies is a combination of the depositional environment and the characteristics of the sedimentary rocks (objects) formed in this environment. Modern sedimentary research focuses on the macroscopic distribution and internal characteristics of sedimentary facies by analyzing the material composition, formation process, and planar distribution of modern sediments. Scholars at home and abroad have studied the deposits of modern rivers (such as the Yellow River, Mississippi River, and Amazon River), deltas (such as the Mississippi River Delta, Yangtze River Delta, and Ganjiang Delta), lakes (such as Poyang Lake, Qinghai Lake), and oceans (such as the Gulf of Mexico). A large number of studies have been carried out on these facies...

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Problems solved by technology

[0005] However, the disadvantages of adopting the sampling method of the inner plug PVC pipe are: 1) the sampling efficiency is low. In order to prevent the deformation of the PVC pipe, only 1-2m (1-2 drill pipes) depth can be continuously drilled each time. It is difficult to take out the PVC pipe from the drill pipe. When encountering sticky sediment, it is difficult to pour the sediment directly from the PVC pipe, and it needs to be cut directly with a knife. Because the hardness of the PVC pipe is high, it is difficult to cut it; 2) It cannot be continuous During drilling, if a water-bearing sand layer is encountered, the hole is likely to collapse, and the impact of the collapse on the vertical sequence of sediments needs to be considered when drilling again; 3) The operation of cutting the PVC pipe with a knife is dangerous, and The section of PVC is relatively sharp, and it is easy to scratch when sampling in the field; 4) The section of the sediment that is cut with a knife is not straight and beautiful; Higher; 6) The inner diameter of the drill pipe is only about 50mm. After the PVC pipe is plugged in, the sampling diameter is further reduced. The smaller the sampling diameter, the smaller the sampling volume, and the more difficult it is to identify the sedimentary structure

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