CLOSED LOOP MULTIPHASE UNDERBALANCED DRILLING PROCESS

摘要

The present invention provides apparatus and methods for handling fluids returning from a well. The fluids are introduced into a separator (110) and a separated gas stream (60) is recovered or recycled. The gas stream may comprise more than one phase. The separated gas stream is urged through a multiphase pump (200) before it is recovered. Alternatively, the return flui ds may pass through a multiphase pump before it is introduced into the separato r.