Drilling and producing deep water subsea wells
First Claim
1. A method of drilling and completing a plurality of subsea wells, comprising:
- (a)with a floating platform, connecting a drilling riser to a first wellhead housing, drilling and casing a first well, then running a string of tubing and landing a tubing hanger in the first wellhead housing;
(b)with the floating platform, disconnecting the drilling riser from the first wellhead housing, connecting the drilling riser to a second wellhead housing, and performing operations on a second well; and
(c) while performing at least part of step (b), lowering a production tree on a lift line from the same floating platform and connecting the tree to the first wellhead housing.
2 Assignments
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Accused Products
Abstract
Subsea wells are drilled and completed with an offshore floating platform in a manner that allows simultaneous work on more than one well. A first well is drilled and casing. Then a tubing hanger is run through a drilling riser and landed in the wellhead housing. Then, with the same floating platform, the drilling riser is disconnected and moved to a second well. While performing operations on the second well, the operator lowers a production tree from the floating platform on a lift line, and connects it to the first wellhead housing. An ROV assisted subsea plug removal tool is used for plug removal and setting operations required through the production tree. Seabed separation is configured upstream of a production choke valve.
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Citations
17 Claims
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1. A method of drilling and completing a plurality of subsea wells, comprising:
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(a)with a floating platform, connecting a drilling riser to a first wellhead housing, drilling and casing a first well, then running a string of tubing and landing a tubing hanger in the first wellhead housing;
(b)with the floating platform, disconnecting the drilling riser from the first wellhead housing, connecting the drilling riser to a second wellhead housing, and performing operations on a second well; and
(c) while performing at least part of step (b), lowering a production tree on a lift line from the same floating platform and connecting the tree to the first wellhead housing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of drilling and completing a plurality of subsea wells, comprising:
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(a)with a floating platform, connecting a drilling riser to a first wellhead housing, and drilling and casing a first well;
(b) running a string of tubing and landing a tubing hanger in the first wellhead housing;
(c) lowering a perforating gun through the tubing, perforating the well, then setting a plug in the tubing hanger;
(d) disconnecting the drilling riser from the first wellhead housing;
then(e) with the floating platform, connecting the drilling riser to a second wellhead housing, and drilling and casing a second well; and
(f) while performing at least part of step (e), lowering a production tree on a lift line from the same floating platform and connecting the tree to the first wellhead housing. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A method of producing a subsea well, comprising:
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connecting a subsea fluid separator to a subsea manifold having flowlines leading to a surface processing facility;
connecting a flowline jumper from the tree to the subsea fluid separator;
connecting a choke between the separator and the subsea manifold; and
flowing well fluid from the tree to the separator, separating heavier and lighter components of the well fluid in the separator, and reducing pressure of the flowing well fluid product as the well fluid flows through the choke to the manifold for transport to the surface facility.
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Specification