Patent ID: 11913299
Assignee: ITREC B.V.
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 0:
1. A top drive system for drilling a wellbore and other wellbore related activities involving a drilling tubulars string, said top drive system comprising:
a frame structure adapted to support a load formed by a drilling tubulars string that passes along a firing line to or into a wellbore,
a top drive device comprising:
one or more top drive motors adapted to impart a rotary torque to the drilling tubulars string,
a transmission housing accommodating a transmission to which said one or more top drive motors are connected,
a floating quill system comprising a hollow vertical floating quill shaft that is vertically mobile relative to the transmission housing whilst in engagement with the transmission allowing the floating quill shaft to be driven by said one or more top drive motors, said floating quill system further comprising one or more floating quill shaft vertical displacement actuators configured to cause controlled vertical motion of the floating quill shaft, at least during a make up and/or a breaking of a threaded connection to the drill tubulars string,
a thrust bearing housing arranged below the transmission housing and suspended from the frame structure, said thrust bearing housing being provided with a thrust bearing configured to support the load of the drilling tubulars string,
a hollow vertical outer main shaft which is suspended from the thrust bearing housing via said thrust bearing so as to be rotational relative to said thrust bearing housing, said outer main shaft having a portion that extends below said thrust bearing housing,
a hollow vertical inner main shaft which is arranged vertically mobile within the outer main shaft,
wherein the inner main shaft is connected to the floating quill shaft so as to move vertically along with the floating quill shaft and so as to rotate along with the floating quill shaft when driven by the one or more top drive motors,
wherein the inner main shaft has a lower connector end that is configured to be connected to the drilling tubulars string via a threaded connection so as to allow for transmission of the rotary torque from the one or more top drive motors via the transmission, the floating quill shaft, the inner main shaft, and the threaded connection to the drilling tubular string,
wherein the inner main shaft, on the one hand, and the outer main shaft, on the other hand, are provided with cooperating axial load support faces, said axial load support faces being engaged in a lowered position of the assembly of the floating quill shaft and the inner main shaft relative to the outer main shaft and said axial load support faces being disengaged in a raised position of said assembly of the floating quill shaft and the inner main shaft relative to the outer main shaft,
wherein the outer main shaft is provided with an elevator bails carrier that is configured to carry elevator bails.