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Deepwater drilling challenges Benjamin choo Gm, Drilling – murphy malaysia. Introduction. In search for oil and gas, operators have moved further offshore and into deeper waters. Deepwater is generally described as water depths > 1000 ft or 300 m.
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Deepwater drilling challenges Benjaminchoo Gm, Drilling – murphymalaysia
Introduction • In search for oil and gas, operators have moved further offshore and into deeper waters. • Deepwater is generally described as water depths > 1000 ft or 300 m. • Deepwater is the ‘final frontier’ of oil and gas exploration. • Deepwater fields have large commercial upside, hence justifying the technical and financial risks.
Offshore Sabah Water Depths Kinabalu Field: 55m Deepwater Block K: 1,320m Petronas Towers: 452m
Deepwater Drilling Challenges • Deepwater drilling provides the greatest challenges in scope and opportunity. • Drilling costs typically make up 50% to 60% of deepwater development costs. • Overcoming deepwater drilling challenges is key to unlocking deepwater oil and gas fields as they represent the majority of the development risks and costs. • Key aspects of deepwater drilling are the deepwater drilling rig, support vessels, shore base, specialized well planning, well control equipment and emergency response.
Deepwater Drilling Rig • Deepwater drilling rigs are floating rigs. • Semi-submersible or drill ship design. • They are either moored or anchored at location or are dynamically positioned (DP). • High load capacity, large storage capability and capable of handling high wellbore pressures (15,000 psi). • High day rates (>$500k/day).
Deepwater Drilling Support Vessels • Large support vessels for deepwater drilling rigs function as: • Towing and anchor handlers for moored rigs. • Supplies fuel, tools, material and equipment to the drill rig. • Remotely Operated Underwater Vehicle (ROV) support.
Subsea Well Control Equipment • Deepwater drilling rigs utilize subsea blowout preventers (BOPs) located at the sea floor. • Subsea BOPs are designed to operate in high external pressures caused by water depth and up to 15,000 psi internal pressure. • Operated by electro-hydraulic multiplex (MUX) systems to achieve fast response.
Deepwater Well Construction • Deepwater wells construction is unique as it is based on a subsea wellhead system. • Deepwater wells are challenging due to the narrow window between the formation pressure and the rock strength. • Other challenges include gas hydrates and cold seabed temperature.
Shorebase Support for Deepwater Drilling • Good setup of a shore base helps to efficiently support deepwater drilling operations and prevent expensive shutdown of the drilling rig • The shore base needs to have good infrastructure access, ample yard space and sufficient water depth at the quay for large deepwater drilling support vessels to berth.
Deepwater Emergency Response • Emergency well control and blowout response plan need to be developed. • Emergency responsebased on ICS structure. • Access to subsea well containment package. • Subsea capping stack. • Subsea dispersant system and dispersants. • Debris removal. • Ability to drill relief well.
Other Challenges • Escalating costs, i.e. rigs, vessels, third party services, etc. • Finding and retaining competent key personnel. • Increasingly stringent regulatory requirements for deepwater drilling post Macondo. • Long lead times for tools and equipment.
Murphy’s Deepwater Operations in Malaysia • Drilled over 120 deepwater wells in Malaysia since 2002. • Global top quartile deepwater drilling performance. • Held world record for deepest water depth for mooring a semi-submersible rig for Ocean Rover in 8,430 ft (2,570m) of water depth. • Developed and producing from Kikeh since Aug 2007 which is the first deepwater field in Malaysia. • Production from subsea tieback of GumusutKakap deepwater field. • First oil achieved from Siakap North Petai deepwater project in Feb 2014. Ocean Rover SKD Menang, Kikeh DTU and Kikeh FPSO
Deepwater Drilling Performance – Murphy Malaysia vs Global Murphy