Air reverse circulation continuous sampling drilling system and technical method for water-containing formation

Abstract

The invention discloses an air reverse circulation continuous sampling drilling system and technical method for a water-containing formation. The system comprises a reverse circulation drilling rig, adrilling tool, an air compressor, a forward and reverse circulation remote switching joint, a forward and reverse circulation slag discharge and drainage device, a separation and collection device for forward circulation discharged rock debris samples, and a separation and collection device for reverse circulation discharged rock debris samples. The forward and reverse circulation remote switching joint is closed, an inner pipe channel of a double-wall drill pipe is closed, under the action of underground high-pressure air, formation water sequentially passes through the gap between the holewall of a drilled hole and the outer wall of the double-wall drill pipe, the forward and reverse circulation slag discharge and drainage device and the separation and collection device for the forwardcirculation discharged rock debris samples from the hole bottom of the drilled hole for formation water drainage and monitoring, the forward and reverse circulation remote switching joint is opened,and dry rock debris sample collection is achieved. According to the technical method, in the drilling and sampling process of the water-containing formation, forward circulation is used for drainage of the water-containing formation, reverse circulation is used for dry rock sample collection, and the rock sampling rate is increased on the premise that the returned rock samples are dry.

Description

technical field [0001] The invention relates to the technical field of drilling, in particular to an air reverse circulation continuous sampling drilling system and a process method for water-bearing formations. Background technique [0002] Air reverse circulation continuous sampling drilling technology is a drilling technology aimed at obtaining high-quality cuttings samples continuously and efficiently. It is a drilling process method in which rock samples are returned to the surface at high speed from the central channel. Due to the special design of the shape and structure of the bottom hole drill, the compressed air begins to diverge after reaching the bottom of the hole, and most of the air carries the cuttings that are immediately broken by the drill bit at the bottom of the hole and enters the center channel of the upper drill tool through the through hole on the drill bit face; a small part of the air Going up from the gap between the drill pipe and the hole wall ...

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Problems solved by technology

[0005] In order to overcome the defects of the prior art, the object of the present invention is to provide an air reverse circulation for water-bearing formations in order to solve the problems of using air reverse circulation continuous sampling in water-bearing formations to drill and sample, the sampling rate is too low, and sample processing is difficult. Continuous sampling drilling system and process method

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