Hydraulic driving system for offshore drilling compensation winch

Abstract

The invention discloses a hydraulic driving system for an offshore drilling compensation winch.A hydraulic secondary regulation element and a driven hydraulic cylinder jointly drive the winch to fulfill a heave compensation function, and a bit feeding hydraulic motor drives the winch to fulfill an automatic bit feeding function.During compensation, the driven hydraulic cylinder and a liquid-gas energy storage device thereof are used or bearing all static loads of a drilling rig and periodically recovering and releasing gravitational potential energy of loads; the hydraulic secondary regulation element operates in a constant-pressure network to overcome other loads in the compensation process, and the liquid-gas energy storage device periodically recovers and releases inertia kinetic energy of the a winch rotary system.During bit feeding, the driven hydraulic cylinder and the liquid-gas energy storage device thereof recover the gravitational potential energy of the loads of the drilling rig and release in lifting of a drilling rig traveling system.The hydraulic driving system is integrally compact in structure, a hydraulic energy recovery system is high in operation efficiency and long in service life, and an engine is low in power and power 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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