SUBSEA SYSTEMS WINNER: ONESUBSEA, A SCHLUMBERGER COMPANY - MULTIPHASE COMPRESSION SYSTEM

摘要

OneSubsea, a Schlumberger company, has developed, qualified and put into operation a multiphase compressor technology enabling boosting of unprocessed well streams. This minimal footprint, contra-rotating compressor technology is a subsea compressor concept that works at any combination of gas and liquid (0% to 100% gas volume fraction). It is a robust, yet highly efficient machine tolerating transient process conditions, such as large liquid slugs and variable process pressure. Subsea compression is used to extend plateau production, accelerate production, optimize reservoir drainage and maximize ultimate recovery. The Schlumberger multiphase compressor leverages extensive OneSubsea subsea pump system experience. Subsea boosting has accumulated more than 3 million operating hours - equivalent to 350 years - and is recognized as an important part of enhanced drainage strategies. Experience is being gained from a North Sea subsea gas field, where the robustness and versatility of the equipment have contributed to large value generation. The compressor has been used to kick off dead wells and enhance liquid recovery from the field. Its capability to handle large liquid loads (up to 100%) has been pivotal to unlocking this potential. The multiphase compressor system has operated with 100% regularity since startup and has reached Technology Readiness Level 7. A major advantage of subsea compression over topside compression is that the compressor is located closer to the reservoir; hence, the power required for the same differential pressure is less and the potential drawdown of the reservoir is larger. Subsea compression stabilizes the flow and reduces flowline pressure loss.