LNG plant in Qalhat, near Sur. To fulfill its end of the agreement, the company had to drill wells, hook them up to a new gas processing plant at Saih Rawl, and then transport the processed gas via a 352-kilometre pipeline to Qalhat. Furthermore, PDO would then be responsible for guaranteeing the delivery of gas for 25 years. This upstream LNG project, costing $1.2 billion, is the single biggest project in PDO's history. And it was executed as planned. The Saih Rawl Central Processing Plant and the gas pipeline from Saih Rawl to Qalhat were dedicated to the nation in November 1999, the first downstream cargo of LNG was shipped to Korea in April 2000, and His Majesty the Sultan officially opened the LNG plant six months later. Having built up such momentum in its oil production as it entered the 1990s, the Company fully expected the trend to continue. Unfortunately, the company's field-development strategy for the start of the 21st century – based on incremental infill drilling with horizontal wells and extensive waterflooding – had its momentum dissipated before the waterflooding projects, which require comprehensive reservoir studies, could be fully implemented. The natural production-rate decline of its major oil fields eventually caught up with the Company at the start of the millennium. In 1997, the 35-year old Yibal field began to decline in production. Two scientific papers published in 2003 showed a decline of about 12 percent annually since 1997, with 5 percent being the regional average. Sustainability (2002–present) Following a comprehensive review in 2002 that led to a sweeping change programme, PDO laid out ambitious production-recovery plans based not only on waterflooding but also on enhanced oil recovery (EOR) techniques: the application of heat, chemicals or gas solvents to alter the way oil or injected water flows in a reservoir. But, in order for them to be sustainable in the long run, the plans had to be executed for substantially less money than originally envisaged, making them all the more challenging. A total of $2 billion in cost savings over the five-year period 2002–2008 were incorporated into the company's budget. Fortunately, because of the long-term nature of investments that would be required, the Omani Government agreed at the end of 2004 to extend PDO's exploration and production concession and operating agreements for 40 years – until 2044. Meanwhile, gas continues to be a growth area for the company.