RIASSUNTO
Abstract
Petronas Carigali Sdn Bhd (PCSB) is one of major oil and gas companies in South East Asia. It has had years of experience operating coil tubing unit (CTU) on relatively large oil and gas field platforms. Vast of field experience and project lessons learned have been captured, refined and eventually embedded in the company's CTU standard operating procedures. These have lead to zero lost-time incidents (LTIs) cases in 5 years of CTU operations particularly offshore Terengganu in South China Sea. The CTU operations are often complex and involve heavy lifting, weighty machineries, minimal deck space and long working hours. Hence, to achieve such a record through out the 12 months in a year with 2 units running concurrently is definitely something to be noted.
In February 2009, PCSB embarked on it first barge mounted CTU operation at offshore Terengganu. The option was choosen to access marginal field with small platform deck space and limited crane capacities. These include the process of lifting heavy equipment from workbarge with 60 degree angle to a 50 ft high platform during high swell, having to mobilize crews back and fourth from workbarge to platform and rigging up in dynamic condition. Furthermore, it was the first time the work barge crews experienced such operation and communication constraints due to remote and weather conditions further complicated the situation.
Knowing that field experience is almost zero for mounted barge CTU operations in PCSB fields, resources and time has been put to ensure that the HSE track record is intact. Starting with Project Risk Assessment (PRA) which involved all contractors and field operator personnel, the team then analyzed of the whole campaign chain. This paper will review PCSB project success experiences and lesson learns on how to do CT operation from Barge within small platform during moonson season with high level of safety.
Introduction
PCSB Peninsular Malaysia Operation (PMO) owns and operates 13 oil and gas fields in South China Sea, located at offshore Terengganu. The number of platform that had been erected was around thirty comprised of huge eight legged platform to the smallest of a monopods and been develop in water depths ranging of 65 to 75 meter. In a bigger mother platform cranes capacity of 25 MT is common while remote operating platform the design capacity only cater between 12 to 18 MT. Compliment with its big capacity crane, the deck space on mother platform will have relatively huge area. The choice of platform size, and crane capacities largely depend on the location and field development plan philosophy.
Small fields platforms philosophy were developed since 90's to access the marginal, small compartment reservoir that will not be economic using conventional platform technique. These consist of small monopod, and tripod platform. For this type of platform, the crane will be ranging from 3-5 MT with obvious smaller deck space.