Drilling coring equipment by adopting natural composite slurry to drill to achieve effect of rock core coated with mud

Abstract

The invention discloses drilling coring equipment by adopting natural composite slurry to drill to achieve the effect of a rock core coated with mud. The drilling coring equipment comprises a drill pipe and a rock core pipe. A drill pipe joint located on the upper portion of the rock core pipe is a joint with a marble seat, the marble seat is arranged in the drill pipe joint, and when a water stopping marble is arranged in the marble seat, the upper portion of the rock core pipe is sealed; and the two ends of the rock core pipe are connected with a rock core pipe joint and an alloy drill bit,one end of the drill pipe is connected to the interior of the drill pipe joint, and the drill pipe joint is connected with the rock core pipe joint. The defects that in the prior art, the sandy soil rock core sample recovery is lower than 70%, and the undisturbed grain composition and structure of sandy soil cannot be maintained are overcome. The drilling coring equipment has the advantages that the sandy soil rock core sample recovery is sharply improved and can be as high as 100%, and the sampled sandy soil rock core sample is coated with mud, so that the undisturbed grain composition and structure of the sandy soil of the sandy soil rock core sample are maintained.

Description

technical field [0001] The invention relates to the technical field of taking sand core samples, in particular it is a drilling and coring device that adopts natural composite mud drilling to reach mud-coated cores; more specifically, it uses natural composite mud drilling in sand to reach mud Drilling and coring equipment for sandy soil cores wrapped in mud; more specifically, it achieves a substantial increase in the sampling rate of sandy soil cores, up to 100%, and mud coats sandy soil core samples to keep sandy soil core samples Drilling and coring equipment for undisturbed particle gradation and structure of sandy soil. Background technique [0002] Sandy soil is a common loose soil in Quaternary strata, which is granular, has no cohesive force, is easily broken under the condition of no confining pressure, and is easy to form quicksand flowing with water under the action of hydraulic force. The low rate of drilling cores in sandy soil layers has always been one of th...

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Problems solved by technology

The low rate of drilling cores in sandy soil layers has always been one of the main problems affecting the quality of engineering drilling. For some projects that need to study the microstructure of sand layers, the existing techniques and methods are difficult to meet the engineering requirements

[0003] The existing sand core sample collection technology level is low, and the sand core sample collection rate has always been low, mostly below 50%, which affects the sand layer and geological identification accuracy

[0004] Sandy soil core samples are often mixed with mud, it is difficult to accurately determine the particle composition of sandy soil core samples, and repeatedly disturbed in the drilling tool, the sandy soil core samples taken out cannot reflect the original structure of sandy soil

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