Abstract:
The invention concerns a subsea system transporting fluid, wherein the subsea system comprises a first part having a flow path carrying a flow of fluid and at least a second part having a flow path provided for carrying fluid. The second part is temporarily being closed off from the flow path of the first part of the subsea system. The heat from the fluid transported in the first part of the subsea system is transferred to the second part by a heat conducting structure establishing a contact between the first and second part of the subsea system, to prevent the formation of hydrates in the second part of the subsea system.
Abstract:
There is disclosed a subsea cooler for the cooling of a fluid flowing in a subsea flow line. The subsea cooler comprises an inlet and an outlet which are connectable to the subsea flow line and at least two cooling sections arranged in fluid communication with the inlet and the outlet of the subsea cooler. Each cooling section includes a plurality of cooling pipes which are configured such that they exchange heat energy with the surrounding sea water when the subsea cooler is in use. The subsea cooler is further provided with valve means such that the flow of fluid through the cooling sections may be regulated individually. There is also disclosed a method for removal of accumulated wax, hydrates and sand and debris which has accumulated in the subsea cooler wherein separate cooling section are shut off whereby the temperature of the fluid flowing through the subsea cooler is increased thereby melting the wax and hydrates, and whereby the speed of the fluid flow through the subsea cooler is increased thereby jetting out sand and debris.
Abstract:
There is provided a subsea system for increasing pressure and/or flow rate in a flow line (46), the subsea system being arranged in fluid communication with said flow line (46) which receives fluid from at least one fluid source (A). The subsea system comprises at least one ompressor or pump (42) and at least one subsea cooler (44) which is arranged in the flow line in series with the at least one compressor (42). The subsea system further comprises a recirculation line (50) which is confirgured such that at least a portion of the fluid flowing in the flow line (46) downstream the at least one compressor (42) and the at least one subsea cooler (44) may be recirculated back to the flow line (46) upstream the at least one compressor (44) and the at least one subsea cooler (42) such that the recirculating line (50) can be used for capacity regulation of the at least one compressor (44) and cleaning of the at least one subsea cooler (42). There is also provided a method for the removal of wax and/or sand and debris which has accumulated in at least one subsea cooler (44) of a subsea system.
Abstract:
A heat exchanger system (150) is described that includes an inlet (202) and an outlet (204) for a first fluid and a heat exchanger between the inlet (202) and the outlet (206) wherein the first fluid circulates, wherein the heat exchanger comprises at least one deflector (230, 232, 234, 236, 238, 430, 432) to guide the flow of a second fluid. A method is also described to exchange heat between a first and a second fluid using free convection velocity field to create forced convection in the heat exchanger of a heat exchanger system (150). A method to exchange heat between a first and a second fluid comprising providing a heat exchanger system (150) between the first and the second fluids, said heat exchanger system (150) comprising a heat exchanger wherein the first fluid circulates and increasing the flow turbulences of a second fluid around the heat exchanger.