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[英]Need Drives Advances

[加入收藏][字號:大中小] [時間:2011-06-08 來源：www.worldoil.com 關注度:0]

摘要: Pride International ultra-deepwater drillship Deep Ocean Clarion makes its way from South Korea to the US Gulf ...

As for the subsea equipment, Helix has an intervention riser system (IRS), which includes a 135⁄8-in., 10,000-psi connector. The IRS has a hydraulic cutting gate valve, a maximum bore diameter of 73⁄8 in. plus a well barrier and two spring-assist fail-safe-closed gate valves of the same size. Remotely controlling the IRS functions is a pilot-line hydraulic control system that was originally capable of operating in up to 5,600 ft of water; an upgrade to a multiplex control system and the use of 8,500 ft of electric cable and ½-in. hydraulic supply line have extended its reach to 8,000 ft.

The final piece of the Helix Fast Response System is the ROV-operable well cap, which is comprised of an 18¾-in., 10,000-psi hydraulic wellhead connector and a 135⁄8-in., 10,000-psi dual ram block with an 18¾-in., 10,000-psi mandrel (profile up). The cap has a 135⁄8-in. bore and 41⁄16-in., 10,000-psi side outlets with BX-155 seals. Flowrate and pressure can be regulated through two 33⁄16-in. vents.

MWCC. In July of last year, four operators came together to create MWCC as a non-profit organization to operate and maintain a rapid response system to capture and contain oil following a deepwater blowout. With ExxonMobil leading the way, Chevron, ConocoPhillips and Shell committed $1 billion to fund the initial costs of the system.

Since its inception, the company has grown to 10 members as Anadarko, Apache, BHP Billiton, BP, Hess and Statoil have joined. The member companies will each have access to the containment systems, but non-member firms will also have access to the systems through a service agreement and fees.

While Helix’s solution uses equipment that the company already uses for other tasks, MWCC is building its system around components that are strictly for use in oil containment situations. MWCC’s equipment is stored at various locations along the Gulf coast in Texas and Louisiana.

When BP joined MWCC in September, the operator made available to the consortium the equipment it used in containing the Macondo well. This equipment makes up part of MWCC’s interim containment system.

Fig. 3. The MWCC expanded containment system.

The dual-shutoff interim system is designed for use in water depths up to 8,000 ft. It has the capacity to contain 60,000 bpd of liquids and 120 MMcfd of gas, with potential for expansion. It includes a 15,000-psi single-ram capping stack and dispersant injection capability.

While the interim system is in place now, MWCC is working on an expanded system (Fig. 3), which is scheduled for launch in 2012. MWCC has contracted Technip to design dedicated subsea well containment equipment, including the containment assembly, manifold, control umbilicals, accumulator, dispersant injector, risers and flowlines.

When completed, the expanded system will be capable of operating in up to 10,000 ft of water with a 15,000-psi, three-ram stack and a dispersant injection system. It will have the capacity to contain 100,000 bpd of liquids and 200 MMcfd of gas, although using additional vessels could increase capacity.

The expanded system will have a new subsea containment assembly that will create a permanent connection and seal to prevent oil from escaping. The assembly, which is designed to prevent hydrates from forming, will have adapters and connectors so it can interact with the wellhead, BOP stack, lower marine riser package and/or casing and strings that are used by operators in the US Gulf.

Capture caisson assemblies will also be built to close off a damaged connector or leak that is outside the well casing. Once installed, the caisson will create a seal with the seabed to prevent seawater from entering.

Captured oil will flow through a flexible pipe to a riser assembly. If more than one capture vessel is required, a manifold will distribute oil from the subsea assembly to multiple riser assemblies. The risers and umbilicals will be able to quickly disconnect from capture vessels should they need to get out of the path of a hurricane.

The extended system will also include modular process equipment that will be installed on the capture vessels. The process equipment will separate oil from gas, flare the gas, and store oil until it can be offloaded to shuttle tankers.

Deployment of the system will begin within 24 hours of an incident. MWCC will make the equipment available to the incident operator, who is separately responsible for securing the required capture vessels.

原文地址：http://www.worldoil.com/May-2011-Need-Drives-Advances.html