Hydraulic Drive System of Compensation Drawworks in Offshore Drilling

Abstract

The invention discloses a hydraulic drive system of a compensating winch for offshore drilling. The drawworks is jointly driven by a hydraulic secondary adjustment element and a passive hydraulic cylinder to complete the heave compensation function, and the drawworks is driven by a drilling hydraulic motor to complete the automatic drilling function. During the compensation process, the passive hydraulic cylinder and its hydro-pneumatic energy storage device are used to bear all the static loads of the drilling rig, and the gravitational potential energy of the load is periodically recovered and released; the hydraulic secondary adjustment element works in a constant pressure network to overcome the compensation process The rest of the load, and use the liquid-pneumatic energy storage device to periodically recover and release the inertial kinetic energy of the drawworks slewing system. During the drilling movement, the drilling rig load gravity potential energy is recovered by using the drilling hydraulic motor and its hydraulic-pneumatic energy storage device, and then released when the drilling rig swimming system is lifted. The present invention has compact overall structure, high working efficiency and long service life of the hydraulic energy recovery system, and low engine power and energy consumption.

Description

Technical field: [0001] The invention relates to a hydraulic drive system of a compensating winch for offshore drilling, which is a drive device characterized by hydraulic energy recovery and electro-hydraulic control technology. Background technique: [0002] The floating drilling device used in offshore oil drilling will produce periodic heave movement under the action of natural factors such as wind and waves, which will drive the drilling equipment and drill string to perform heave movement, which will affect the drilling efficiency and increase the drilling cost. Even cause safety accidents. Therefore, a floating drilling platform or drilling ship must be equipped with a heave compensation system to stabilize bottom-hole drilling pressure and reduce drilling dynamic load. The overall performance of the system directly affects the development cost of offshore oil. The heave compensation system is a complex equipment integrating mechanics, electricity, gas, hydraulics, a...

AI Technical Summary

Problems solved by technology

[0004] In recent years, the research on offshore drilling compensating winches abroad has made great progress, and electric compensating winches have been launched, which have been effectively applied on new deep-water drilling platforms. The main principle is to increase the Large motor power, using AC variable frequency motor active compensation technology, multiple motors are jointly driven, the drill string position and platform heave signals are sent to the controller through sensors, and the speed and steering of the winch motor are controlled in real time to realize the heave compensation function; The compensation winch has many performance advantages, but there are also technical problems such as high installed power and energy consumption, high motor heat generation, and poor explosion-proof performance of frequency conversion motors.

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