US Patent No: 6,263,981
Number of patents in Portfolio can not be more than 2000
Deepwater drill string shut-off valve system and method for controlling mud circulation
Stats
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Jul 24, 2001
Issued date -
Sep 24, 1998
filing date -
09/160,774
serial no -
In Force
status
Importance
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Abstract
A method is disclosed for controlling the mud circulation system for deepwater marine drilling operations in which a drill string is run from surface facilities, through a blowout preventor and into a borehole. Mud is injected into the drill string, up a borehole and through the blowout preventor adjacent the sea floor. There the mud is withdrawn from a mud exit return line near the blowout preventor and the hydrostatic head from the mud in the drill string is isolated from the relatively lesser ambient pressure at the sea floor seen at the mud exit return line with a pressure activated drill string shut-off valve when mud circulation is interrupted. A drill string shut-off valve system for controlling the mud circulation system for deepwater marine drilling operations is also disclosed. Further, a method of well control to overcome formation pressure in a well control event is disclosed.
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First Claim
Related Publications
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International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
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| 4,310,058 Well drilling method | 32 | 1980 | |
| 5,033,550 Well production method | 54 | 1990 | |
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| 5,803,185 Steerable rotary drilling systems and method of operating such systems | 75 | 1996 | |
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| 4,779,688 Mud saver valve | 12 | 1986 | |
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| 4,813,495 Method and apparatus for deepwater drilling | 183 | 1987 | |
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| 5,417,291 Drilling connector | 11 | 1993 | |
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| 5,417,544 Pump or compressor unit | 17 | 1992 | |
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| 5,310,012 Actuating device associated with a drill string and comprising a hydrostatic drilling fluid circuit, actuation method and application thereof | 57 | 1992 | |
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| 2002/0084,056 Aluminium alloy strips with high surface homogeneity and method for making same | 2001 | ||
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| 5,205,325 Flow control valve | 27 | 1991 | |
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| 5,628,375 Thrust face lubrication system for a rolling cutter drill bit | 6 | 1995 | |
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| 4,689,775 Direct radiator system and methods for measuring during drilling operations | 23 | 1982 | |
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| 4,867,254 Method of controlling fluid influxes in hydrocarbon wells | 20 | 1988 | |
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| 4,461,316 Drilling choke | 13 | 1982 | |
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| 4,588,035 Down hole blow out preventer and method of use | 4 | 1984 | |
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| 4,527,632 System for increasing the recovery of product fluids from underwater marine deposits | 44 | 1983 | |
| 4,619,335 Enhanced circulation drill bit | 11 | 1984 | |
| 2009/0132,648 CONTENT DELIVERY AND GLOBAL TRAFFIC MANAGEMENT NETWORK SYSTEM | 2009 | ||
| 2009/0132,648 CONTENT DELIVERY AND GLOBAL TRAFFIC MANAGEMENT NETWORK SYSTEM | 2009 | ||
| 2009/0132,648 CONTENT DELIVERY AND GLOBAL TRAFFIC MANAGEMENT NETWORK SYSTEM | 2009 | ||
Patent Citation Ranking
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Jan 24, 2013 |
| Fee | Large entity fee | small entity fee | micro entity fee |
|---|---|---|---|
| Surcharge - 11.5 year - Late payment within 6 months | $160.00 | $80.00 | $40.00 |
| Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
| Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |