SHIP USED FOR PERFORMING OPERATIONS IN UNDERWATER RUNNING WELL AND METHOD OF OFFSHORE DRILLING AT REDUCED HYDROSTATIC PRESSURE Russian patent published in 2005 - IPC

FIELD: well drilling and hydrocarbon production equipment; performing operations in running underwater wells.

SUBSTANCE: tanker carries equipment on its deck for performing operations in underwater well which is dynamically positioned above subsea riser running from underwater well. Equipment is connected with subsea riser for performing non-rotary drilling at reduced hydrostatic pressure in well bore. Multi-phase mixture thus formed is divided on tanker and separated liquid hydrocarbons are stored in tanker storage tanks. Equipment for performing operations in underwater well may be mounted on superstructure above main deck. Equipment for non-rotary drilling in well bore at reduced hydrostatic pressure may be provided with spooled tubes and may be mounted near drill ship well located above subsea riser of well to which said equipment is to be connected or near mobile platform which may be shifted to outside position above subsea riser of well.

EFFECT: possibility of performing drilling operations without putting well out of operation.

5 cl, 5 dwg