Heave compensation system as one of the key equipment of offshore floating drilling platform, not only can improve drilling efficiency and safety, but also can prolong the service life of drilling equipment. The heave compensation system mainly includes the compensation of the drill string and the water isolation system. But because of the heave compensation system is a set machine, electricity, gas, liquid, automatic control, intelligent detection for the integration of multidisciplinary high technology products, technical difficulty, investment in research, high risk, long the technology in the global scope, only a few countries have.

Types and subdivision of heave compensation

Under the action of wave, the offshore floating drilling platform will swing out of the front and back, and will also produce the heave and heave motion. This movement, which is periodic with wave motion, will cause the upper and lower movement of the drill pipe string and riser system. The periodic up and down movement of drill string will increase or decrease the pulling force of the big hook, and directly affect the bottom hole drilling pressure. The change is not conducive to the bottom of the drilling pressure and drilling drilling, when the pressure drop to a certain limit, the drill bit is off bottom, unable to continue drilling. The riser system periodically moves up and down, will enable the failure or wellhead device from the bottom. Therefore, in order to ensure the floating drilling platform drilling to improve drilling efficiency, it is necessary to use of heave compensation system, in order to reduce the drill string and the relative movement of the vibration pipe system and submarine and keep constant tension load. Usually the floating drilling platform heave compensation system mainly includes 2 aspects: the drill string compensation and riser system compensation. Drill string compensation according to the installation position and structure can be divided for dilaton heave compensation, travel car hook lift heave compensation crane lift heave compensation, fast rope, rope is fixed or sinking winch and compensation heave compensation forms.

Advantages of digital hydraulic heave compensation

Regardless of all kinds of deep compensation, and ultimately can not be separated from the implementation of the performance of the device as a basis to ensure. Then a good structure, and then a good algorithm, if the final performance of the device can not reflect the performance of high response and high precision, the final component of the compensation system can not meet the actual needs.

Digital hydraulic response due to high speed, good precision, tolerance to the environment is strong, combined with advanced compensation control algorithm and electrical control system, for rise heave compensation system application in offshore drilling, compared to the traditional hydraulic control device, has comprehensive advantages of the great.

Digital hydraulic technology to promote marine engineering to digital, information and intelligent forward.