Method and apparatus for flow assurance management in subsea single production flowline
First Claim
1. A method of managing hydrates in a subsea production system, the subsea production system having a host production facility, a production cluster comprising one or more producers, a water injection cluster comprising one or more water injectors, a water injection line, and a single production line for directing fluids from the one or more producers to the host production facility, the method comprising:
- storing a pig in the subsea production system by injecting the pig into the water injection line, and advancing the pig into a subsea storage location in the subsea production system using injection water;
storing the pig in the subsea storage location for a period of time;
shutting in production from the one or more producers;
injecting a hydrate inhibitor into the subsea production system in order to move the pig to the subsea production cluster, thereby at least partially displacing production fluids from the production cluster;
launching the pig from the subsea storage location; and
injecting a displacement fluid into the subsea production system in order to displace the hydrate inhibitor and any remaining production fluids into the single production line, and to further move the pig through the production line.
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Abstract
Managing hydrates in a subsea includes a host production facility, a production cluster comprising one or more producers, a water injection cluster comprising one or more water injectors, a water injection line, and a single production line for directing production fluid from the one or more producers to the host production facility. The methods comprise placing a pig in the subsea production system, shutting in production from the producers, and injecting a displacement fluid into the subsea production system in order to displace the hydrate inhibitor and any remaining production fluids in the production flowline and to further move the pig through the production flowline. The method may also include further injecting displacement fluid into the subsea production system in order to displace the hydrate inhibitor and pig through the single production line and to the host production facility.
64 Citations
24 Claims
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1. A method of managing hydrates in a subsea production system, the subsea production system having a host production facility, a production cluster comprising one or more producers, a water injection cluster comprising one or more water injectors, a water injection line, and a single production line for directing fluids from the one or more producers to the host production facility, the method comprising:
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storing a pig in the subsea production system by injecting the pig into the water injection line, and advancing the pig into a subsea storage location in the subsea production system using injection water; storing the pig in the subsea storage location for a period of time; shutting in production from the one or more producers; injecting a hydrate inhibitor into the subsea production system in order to move the pig to the subsea production cluster, thereby at least partially displacing production fluids from the production cluster; launching the pig from the subsea storage location; and injecting a displacement fluid into the subsea production system in order to displace the hydrate inhibitor and any remaining production fluids into the single production line, and to further move the pig through the production line. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method of managing hydrates in a subsea production system, the subsea production system having a host production facility, a production cluster comprising one or more producers, a water injection cluster comprising one or more water injectors, a crossover manifold having a central pipeline connecting the production cluster and the water injection cluster, a water injection line, and a single production line for directing fluids from the one or more producers to the host production facility, the method comprising:
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storing a pig in a subsea storage location; shutting in production from the one or more producers; injecting a hydrate inhibitor into a production manifold of the production cluster to inhibit the formation of hydrates; further injecting the hydrate inhibitor in order to move the pig from the subsea storage location, thereby at least partially displacing production fluids from the production cluster; injecting a displacement fluid into the production system in order to displace the hydrate inhibitor and any remaining production fluids into the single production line, and to further move the pig through the production line; and further injecting the displacement fluid into the production system in order to displace the hydrate inhibitor and pig through the single production line and to the host production facility. - View Dependent Claims (21)
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22. A system for managing hydrates in a subsea production system, the subsea production system comprising:
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a production cluster comprising one or more producers operatively connected to a single production line; a water injection cluster comprising one or more water injectors operatively connected to a water injection line, which is configured to deliver a pig into a subsea storage location, wherein the subsea storage location is operatively connected to at least the water injection line, the single production line, and a chemical injection service line; a crossover manifold operatively connected to the production cluster, the water injection cluster, and the chemical injection service line configured to inject a hydrate inhibitor into the crossover manifold to move the pig through the production cluster and into the single production line; a displacement fluid injection service line configured to inject displacement fluid into the crossover manifold; and a control umbilical, the control umbilical comprises at least the displacement fluid injection service line and the chemical injection service line, wherein the production cluster further comprises a production manifold operatively connected to the single production line and at least one production jumper line, each of the at least one production jumper line operatively connected to one of the producers, wherein the water injection cluster further comprises a water injection manifold operatively connected to the water injection line and at least one injection jumper, each of the at least one injection jumper operatively connected to one of the injectors, wherein the crossover manifold further comprise a central pipeline operatively connected to at least the water injection manifold, the production manifold, the chemical injection service line, and the displacement fluid injection service line, wherein the central pipeline is further configured to store the pig and launch the pig. - View Dependent Claims (23, 24)
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Specification