Managed pressure and/or temperature drilling system and method

摘要

The present invention relates to a managed pressure and/or temperature drilling system (300) and method. In one embodiment, a method for drilling a wellbore into a gas hydrates formation is disclosed. The method includes drilling the wellbore into the gas hydrates formation; returning gas hydrates cuttings to a surface of the wellbore and/or a drilling rig while controlling a temperature and/or a pressure of the cuttings to prevent or control disassociation of the hydrates cuttings.

主权项

1. A method for drilling a wellbore into a gas hydrates formation, comprising:
drilling the wellbore into the gas hydrates formation by:
injecting drilling fluid through a drill string disposed in the wellbore and rotating a drill bit disposed on an end of the drill string; andreturning gas hydrates cuttings and the drilling fluid (returns) to a surface of the wellbore and/or a drilling rig; and while drilling the wellbore:
separately injecting a coolant along an annulus of a concentric tubular string conducting the returns to control a temperature of the gas hydrates cuttings, thereby preventing or discouraging disassociation of the gas hydrates cuttings; andcommunicating pressure and temperature from sensors disposed along the concentric tubular string to a rig control system.