Sand gravel stratum drilling device and drilling process

Abstract

The invention relates to a sand gravel stratum drilling device and a drilling process, and belongs to the technical field of geological drilling. According to the technical scheme, a second sleeve (22) is arranged in a first sleeve (20), and cement paste (21) is arranged between the first sleeve (20) and a sand gravel stratum (23) and between the second sleeve (22) and the sand gravel stratum (23); and a drilling tool (7) and a drilling rod (17) are arranged in the second sleeve (22), and the top end of the drilling tool (7) is connected with the drilling rod (17). The sand gravel stratum drilling device and the drilling process have the beneficial effects that the machining precision of the drilling rod is high, dynamic balance is kept in the drilling process, the inner surface and the outer surface of the drilling rod are smooth, rock debris can pass through the drilling rod easily, and the flowing resistance of the rock debris is reduced; a large outer annular gap is formed between the hole wall and an outer pipe of the drilling tool, rock powder is promoted to be rapidly discharged to the ground surface, and the situation that the rock debris is precipitated in a hole, and consequently the accidents of drill sticking and drill burning are caused is prevented; and the drilling efficiency in the sand gravel stratum is improved, the core recovery rate is high, accidents are reduced, and safe drilling is achieved.

Description

technical field [0001] The invention relates to a sand and gravel formation drilling device and a drilling process, belonging to the technical field of geological drilling. Background technique [0002] Conventional wireline coring in sand and gravel formations suffers from a number of construction challenges. First of all, sand and gravel formations are mostly loose, with poor cementation, frequent soft and hard interbeds, and gravel diameters of different sizes. During drilling construction, accidents such as overdiameter, collapse, and drill paste are prone to occur, causing buried drills, stuck drills, etc. during drilling. In-hole accidents such as drill clamping and drill pipe breakage. At present, conventional wireline coring drilling technology is mostly used in sand and gravel formations in China. The outer annular water gap is small, and the chip removal is not smooth, and the cuttings sink to the bottom of the hole, causing secondary breakage; Small, chip remova...

AI Technical Summary

Problems solved by technology

First of all, sand and gravel formations are mostly loose, with poor cementation, frequent soft and hard interbeds, and gravel diameters of different sizes. During drilling construction, accidents such as overdiameter, collapse, and drill paste are prone to occur, causing buried drills, stuck drills, etc. during drilling. In-hole accidents such as drill clamping and drill pipe breakage

At present, conventional wireline coring drilling technology is mostly used in sand and gravel formations in China. The outer annular water gap is small, and the chip removal is not smooth, and the cuttings sink to the bottom of the hole, causing secondary breakage; Small, chip removal is not fast, prone to sticky drilling, affecting continuous drilling; during the drilling process, mud skin often occurs on the inner wall of the drill pipe, the inner pipe is blocked when salvaged, the core recovery rate is low, the life of the drill bit is low, and the cartridge assembly Debris is easy to deposit in the recovery tube, which prevents the card from shrinking and causes problems such as failure of salvaging and recovering the core tube.

Images