RISER HANDLING TOOL
Publication Date: 2016-Apr-19
The IP.com Prior Art Database
A simple and effective design for manually or pneumatically operated riser handling tool with a gear and pinion assembly is disclosed. The riser handling tool works by engaging a pinion meshed with a gear, using pneumatic or manual rotation. Rotating the pinion actuates the main body in translational motion to either engage or disengage the tool from the riser spool. The gear is internally threaded and transfers movement via external threading on the main tool shaft. The riser handling tool eliminates the need for hydraulic pressure for handling marine risers. This tool could be used as a backup or retro-fit kit to existing hydraulically operated equipment.
The invention relates to a manually or pneumatically operated handling tool for deployment of subsea drilling risers for accessing hydrocarbon resources. Current riser handling tool designs are commonly actuated by hydraulic pressure to engage or disengage the riser spools. In some circumstances, the hydraulic piston may cause operational issues due to misuse or operational error. So, there is a need for an alternative design eliminating the use of hydraulics in the riser handling tool.
BRIEF DESCRIPTION OF DRAWINGS
The invention discloses a mechanically operated riser handling tool for bore wells, wherein:
Fig.1 illustrates a riser handling tool assembly with pinion and internally threaded gear.
Fig.2 shows a front cross-sectional view of the riser handling tool assembly.
Fig.3 illustrates the riser handling tool assembly with a cap configured to cover the gears during operation.
Fig.4 shows a secondary lock mechanism used in the riser handling tool assembly.
The invention proposes a design for manually or pneumatically operated riser handling tool with a gear and pinion assembly as shown in FIG. 1. The tool comprises a body, a shaft, an internal threaded gear and a pinion. The proposed tool works by engaging a pinion with a pneumatically or manually operated rotary tool. The pinion is meshed with the gear as shown in FIG. 2, wherein the gear is internally threaded and engaged to the main tool shaft. Rotating the pinion engages the lead screw on the main tool body and actuates the main body in translational motion to either engage or disengage the dogs as shown in FIG. 2.
FIG. 1: Design of riser handling tool assembly with pinion and internally threaded gear
FIG. 2: Front view cross-section of the riser handling tool assembly
The pinion could be designed with an internal hex socket head to facilitate rotation. The gear is covered by a cap during the operation as shown in FIG. 3, while leaving the pinion and hex hole accessible. The tool is engaged and disengaged by converting rotational motion to translational motion by using a pneumatic dr...