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, and drilling and casing a first well;
(b) running a string of tubing and landing a tubing hanger in the first wellhead housing;
then(c) 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.
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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.
77 Citations
13 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, and drilling and casing a first well; (b) running a string of tubing and landing a tubing hanger in the first wellhead housing;
then(c) 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 (2, 3, 4, 5, 6, 10)
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7. 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 well; (b) running a string of tubing and landing a tubing hanger in the wellhead housing;
then(c) perforating the well, then setting a plug in the tubing hanger; (d) disconnecting the drilling riser from the wellhead housing; (e) providing a tree with a flowline connector, lowering the tree into the sea, and rotating the tree to a desired orientation while it is landing on the wellhead housing; and (f) connecting a flowline jumper to the flowline connector and to additional subsea equipment. - View Dependent Claims (8, 9, 11, 12, 13)
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Specification