SUBSEA SYSTEM AND METHOD FOR HIGH PRESSURE HIGH TEMPERATURE WELLS

摘要

In accordance with the present disclosure, a full top-to-bottom subsea system and method used to drill, complete, produce, and perform interventions on HPHT subsea wells is provided. The disclosed systems and methods involve the use of a controlled multiple barrier system, such as a high integrity pipeline protection system (HIPPS), incorporated into the subsea system to divide the system into two sections. The sections on either side of the barrier may be rated for different pressures, temperatures, and/or flow rates. For example, the first section (upstream of the barrier) is rated for operating at pressures/temperatures/flow rates up to a first (higher) threshold. The second section (downstream of the barrier) is rated for operating at pressures/temperatures/flow rates up to a second (lower) threshold. The disclosed subsea production system methodology, which uses barriers to divide the system components between two pressure ratings, may allow for enhanced development of HPHT reservoirs.

主权项

1. A method, comprising:
installing a subsea production system comprising: a high pressure subsea wellhead, a tubing head spool (THS) disposed on the wellhead, a tubing hanger landed within the THS, a production tree disposed on the THS, a riser, and a subsea flowline system coupled between the production tree and the riser; producing hydrocarbons from a subsea reservoir to a topsides production facility via the subsea production system; and controlling at least one barrier disposed within the subsea production system to maintain a pressure barrier between components of the subsea production system located upstream of the barrier and components of the subsea production system located downstream of the barrier, wherein at least one of the components located downstream of the barrier is rated for a first maximum pressure, temperature, or flow rate, and the components located upstream of the barrier are rated for a second maximum pressure, temperature, or flow rate that is greater than the first maximum pressure, temperature, or flow rate.