US2007235223A1PendingUtilityA1

Systems and methods for managing downhole pressure

32
Individually held — no corporate assignee on recordPriority: Apr 29, 2005Filed: Apr 26, 2006Published: Oct 11, 2007
Est. expiryApr 29, 2025(expired)· nominal 20-yr term from priority
Inventors:Brian TarrEgbert Jan Van Riet
E21B 7/128E21B 21/08
32
PatentIndex Score
0
Cited by
0
References
0
Claims

Abstract

A system comprising a drilling vessel, a riser connected to the drilling vessel, a drillstring within the riser, the drillstring extending into a borehole, a drill bit connectable to the drillstring, a pump system comprising an inlet in the riser and an outlet to the drilling vessel, and a pump controller adapted to control a pressure within the riser and the borehole by raising or lowering a fluid level within the riser.

Claims

exact text as granted — not AI-modified
1 . A system, comprising: 
 a drilling vessel;    a riser connected to the drilling vessel;    a drillstring within the riser, the drillstring extending into a borehole;    a drill bit connectable to the drillstring;    a pump system comprising an inlet in the riser and an outlet to the drilling vessel; and    a pump controller adapted to control a pressure within the riser and the borehole by raising or lowering a fluid level within the riser.    
   
   
       2 . The system of  claim 1 , further comprising a subsea blow out preventer connected to the riser.  
   
   
       3 . The system of  claim 2 , further comprising at least one string of casing connected to the subsea blow out preventer, the casing within the borehole.  
   
   
       4 . The system of  claim 1 , wherein the drilling vessel is floating.  
   
   
       5 . The system of  claim 1 , further comprising a liquid level and/or pressure sensor connected to the pump control system.  
   
   
       6 . A method of controlling borehole pressure comprising: 
 installing a riser from a drilling vessel to a subsea blow out preventer or a wellhead;    installing a pump system and a pump controller, the pump system comprising an inlet in the riser and an outlet to the drilling vessel; and    selectively pumping fluid from within the riser to the drilling vessel, to control a fluid level within the riser, and to control a pressure level within the borehole.    
   
   
       7 . The method of  claim 6 , further comprising pumping fluid from within the riser to lower the pressure level within the borehole.  
   
   
       8 . The method of  claim 6 , further comprising monitoring the fluid level within the riser and/or the pressure within the borehole.  
   
   
       9 . The method of  claim 6 , further comprising stopping pumping as needed to raise the pressure level within the borehole.

Join the waitlist — get patent alerts

Track US2007235223A1 — get alerts on status changes and closely related new filings.

We store only your email — no account needed. See our privacy policy.