A kind of self-elevating drilling platform pile legs actively pierce a hole drill bit and method

Abstract

The invention relates to a self-elevating drilling platform pile leg active-puncture one-drill multi-hole drill bit and method. The drill bit comprises a drill bit body with a male buckling joint at the top and multiple roller bits mounted on the drill bit body, the drill bit body can be connected with the bottom of a drill string of a drilling machine through the male buckling joint, multiple branches extend out of the bottom of the drill bit body around in a uniformly distributed manner, multiple extensible rods are mounted at different positions of each branch, a mandrel is arranged at the end of each extensible rod, and the roller bits are mounted on the corresponding mandrels; an inside runner is arranged inside the drill bit body, a middle hole way is formed in each of the branches, the extensible rods and the mandrels, a water hole is formed in the bottom of each roller bit, the middle hole way of each of the branches, the extensible rods and the mandrels is communicated with the inside runner of the drill bit body, and the water hole of each roller bit is communicated with the middle hole way of the corresponding mandrel. By the drill bit, multiple holes can be formed by drilling in one time, and working efficiency of active puncture drilling is improved effectively.

Description

technical field [0001] The invention relates to a ground-breaking drill bit and method for drilling, in particular to a drill bit and method for actively piercing a hole-drilling hole with the legs of a self-elevating drilling platform. Background technique [0002] The jack-up drilling platform is one of the important equipment for offshore drilling and completion, and has become the main force of drilling and completion equipment in waters less than 120 meters deep. The jack-up drilling platform relies on the legs standing on the seabed to support the hull, drilling rig and other equipment, and the hull and operating equipment climb to a certain altitude to carry out drilling and completion operations. However, the pile legs standing in the shallow soil layer of the seabed bear the hull, equipment and operating loads, which will inevitably destroy the shallow soil layer of the seabed and cause instability. The phenomenon that the legs of the jack-up drilling platform sudd...

AI Technical Summary

Problems solved by technology

In order to actively drill holes to break the huge "egg shell" formation, it is necessary to drill dozens or even hundreds of holes in the formation, resulting in dozens or even hundreds of trips of the drill string to complete active piercing with conventional drill bits Drilling operations have extremely low operating efficiency and high operating costs. For offshore drilling operations with high daily costs, the active piercing method of conventional drill bit drilling is not economical

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