Heave compensation device of hook block assembly for marine floating drilling

Abstract

The invention discloses a heave compensation device of a hook block assembly for marine floating drilling. Double piston type hydraulic cylinders are taken as compensation hydraulic cylinders, and high pressure cylinders are connected to high pressure air cavities of the double piston type hydraulic cylinders, so that a passive compensation force is provided to piston rods; meanwhile, hydraulic oil output by a high pressure pump is introduced to upper and lower high pressure oil cavities of the double piston type hydraulic cylinders through a proportional direction valve, so that an active compensation force, the magnitude and direction of which can be controlled, is provided to the piston rods, and the passive and active compensation forces drive a drill jointly to load to realize a heave compensation function. A PLC drives the piston rods to realize the heave compensation function through displacement closed-loop control according to a platform heave movement signal detected by a movement reference unit and a compensation hydraulic cylinder piston rod movement signal detected by a laser range finder. According to the device disclosed by the invention, the compensation control precision can be improved, the system energy consumption and manufacturing cost can be reduced and the service life of the compensation hydraulic cylinder can be prolonged.

Description

technical field [0001] The invention relates to a hydraulic control system characterized by electro-hydraulic control technology, in particular to a heave compensation device for a drill string of an ocean drilling platform. 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, automat...

AI Technical Summary

Problems solved by technology

The active heave compensation system has a good compensation effect and strong adaptability, but due to the large mass of the drill string and frequent up and down reciprocating movements, a large amount of energy is consumed in the compensation process

The passive heave compensation system basically does not require the system to provide additional energy during the compensation process, and the system is simple, but the compensation effect is not ideal, and there is a certain hysteresis phenomenon

Semi-active heave compensation can combine the advantages of both, but the system structure is more complicated and the manufacturing cost is higher

[0004] In the heave compensation device of the traveling block hook, when the ordinary single-acting hydraulic cylinder is used as the heave compensation hydraulic cylinder, the compensation system has the advantages of simple structure and low cost, but because the ordinary single-acting hydraulic cylinder can only realize single-power Stroke control, the compensation accuracy is limited; the composite hydraulic cylinder is used as the heave compensation hydraulic cylinder, and its compensation system can realize dual power stroke control, and the compensation accuracy is high. However, due to the complex structure and manufacturing process of the composite hydraulic cylinder itself, its manufacturing cost high, reduced service life

Images