(Reuters) Singapore's Sembcorp Marine Ltd, one of the largest offshore drilling rig producers in the world, said its net profit in the fourth quarter rose 9.2 percent as higher operating profit offset lower contributions from associates and joint ventures. Sembcorp Marine, which is the world's second-largest jackup rig producer after crosstown rival Keppel Corporation Ltd , posted a fourth-quarter net profit of S$182.4 million ($143.89 million). Its full-year net profit rose 3.2 percent to S$555.7 million, above a mean forecast of 23 analysts of S$528.50 million. The company's order book fell to S$12.3 billion from the all-time high of S$13.5 billion a quarter earlier.