FIELD: oil and gas production.
SUBSTANCE: system comprises underground tunnel, marine riser part sealed under ground and connected to tunnel, pipeline for transportation of products from well to shore, additional pipelines, also for provision of independent functioning of system. Tunnel is laid from shore under sea bottom towards the field. Wellhead is installed and equipped in tunnel with the possibility of further access and service at the tunnel side. With the help of tunneling equipment or by other method, underground tunnel is erected under sea bottom. Tunnel is connected to marine riser installed into sea bottom, inside of which the well is drilled. Lower part of string is removed in tunnel interval, underground wellhead is piped and connected to underground pipeline. Upper part of marine riser is removed for complete underground isolation of the system.
EFFECT: improved environmental safety of oil and gas production from marine fields.
15 cl, 10 dwg
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