Emergency disconnect system for riserless subsea well intervention system
First Claim
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1. A method for riserless intervention of a subsea well, comprising:
- lowering a pressure control assembly (PCA) from a vessel to a subsea production tree;
fastening the PCA to the tree;
lowering a control pod from the vessel to the PCA using an umbilical;
fastening the control pod to the PCA;
lowering an end of a fluid conduit from the vessel to the PCA;
fastening the fluid conduit to the PCA using a dry break connection;
lowering an intervention assembly to the PCA; and
fastening the intervention assembly to the PCA,wherein;
the fluid conduit comprises an upper portion and a lower portion connected by a second dry break connection,the umbilical comprises an upper portion and a lower portion connected by a shearable connection,a clump weight is connected to each of the fluid conduit upper portion and the umbilical upper portion, andthe clump weights are each at a depth at or above a top of the intervention assembly.
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Abstract
A method for riserless intervention of a subsea well includes: lowering a pressure control assembly (PCA) from a vessel to a subsea production tree; fastening the PCA to the tree; lowering a control pod from the vessel to the PCA using an umbilical; fastening the control pod to the PCA; lowering an end of a fluid conduit from the vessel to the PCA; and fastening the fluid conduit to the PCA using a dry break connection.
62 Citations
14 Claims
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1. A method for riserless intervention of a subsea well, comprising:
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lowering a pressure control assembly (PCA) from a vessel to a subsea production tree; fastening the PCA to the tree; lowering a control pod from the vessel to the PCA using an umbilical; fastening the control pod to the PCA; lowering an end of a fluid conduit from the vessel to the PCA; fastening the fluid conduit to the PCA using a dry break connection; lowering an intervention assembly to the PCA; and fastening the intervention assembly to the PCA, wherein; the fluid conduit comprises an upper portion and a lower portion connected by a second dry break connection, the umbilical comprises an upper portion and a lower portion connected by a shearable connection, a clump weight is connected to each of the fluid conduit upper portion and the umbilical upper portion, and the clump weights are each at a depth at or above a top of the intervention assembly. - View Dependent Claims (2, 3, 4, 5)
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6. A method for riserless intervention of a subsea well, comprising:
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lowering a pressure control assembly (PCA) from a vessel to a subsea production tree; fastening the PCA to the tree; lowering a control pod from the vessel to the PCA using an umbilical; fastening the control pod to the PCA; lowering an end of a fluid conduit from the vessel to the PCA; and fastening the fluid conduit to the PCA using a dry break connection, wherein; the control pod is fastened to the PCA by a pod receptacle comprising a latch and an actuator, the latch comprises a shearable fastener operable to release the control pod in response to a predetermined tension exerted on the umbilical, and the actuator is operable by either the control pod or a remotely operated vehicle (ROV). - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14)
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Specification