An offshore drilling technique

Abstract

The invention provides a marine drilling technology. A system comprises an air distribution shaft (3) driven by a power head (1); the air distribution shaft (3) is sleeved with an air distribution sleeve (4); a plurality of drill pipes (5) are vertically cascaded to form a drill pipe assembly; the drill pipe assembly is in drive connection with the air distribution shaft (3), and the drill pipe located at the bottommost stage of the drill pipe assembly is connected to the top of a transition joint (6); the bottom of the transition joint (6) is connected with a hybrid connection cylinder (9) through a guide section (7) and a connection cylinder (8); the power head (1) is in drive connection with the air distribution shaft (3) through a transition section (2), and an air inlet straight pipe(3.3) of the air distribution shaft (3) penetrates through the transition section (2). The marine drilling technology has the advantages that the structure is reasonable, assembly is convenient, and the slurry returning and deslagging effects are good.

Description

technical field [0001] The invention relates to a drilling process, in particular to a drilling process applied in offshore wind power construction, and belongs to the technical field of marine construction equipment. Background technique [0002] At present, in the construction of offshore wind power, drilling operation is a very critical link; it needs to carry the drilling slag through the mud and discharge it in time during the downward excavation process, otherwise the drilling slag staying at the bottom of the tunnel will hinder the drilling of the drill bit; In addition, the conventional drilling process also has the following disadvantages: [0003] 1. The high-pressure air pipes are all introduced vertically from the top, but due to the limited mechanical structure design, it is impossible to install multi-air independent air pipes, so only one main pipe can be used to introduce high-pressure gas; [0004] 2. The air duct connected inside the double-wall drill pipe...

AI Technical Summary

Problems solved by technology

[0003] 1. The high-pressure air pipes are all introduced vertically from the top, but due to the limited mechanical structure design, it is impossible to install multi-air independent air pipes, so only one main pipe can be used to introduce high-pressure gas;

[0004] 2. The air duct connected inside the double-wall drill pipe adopts a fixed connection method. Because it is a rigid connection, its torsion resistance is poor. For the drilling tool system for offshore construction, the hydraulic torque is extremely large, so it is easy to drill During the rotation of the rod, the connection between the air pipe and the top and bottom surfaces of the drill pipe breaks, resulting in air leakage and affecting the mixing and discharge of mud and air;

[0005] 3. Conventional drill pipes use one air source and one pipeline. The structure of one pipeline is simple, but the resistance of the corresponding multiple suction ports is inconsistent and the absorption capacity is different. Local blockage is prone to occur, thus affecting the effect of slurry return and slag discharge

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