Application and Development of Well Site Regional Survey in Bohai Bay
Cnooc Energy, Cnooc Lt · Oil Forum · 2010
Ocean well site survey is to carry out measurement and survey of undersea rock formations,water depth,seabed topography,shallow gas and soil around the well location before spudding,which is important to ascertain the safety of drilling rigs positioning.Recently with the rapid development of Bohai Oilfield,the existing survey vessel resources are too tight to fully and timely meet the work requirements.In early 2008,the Drilling Department of Tianjin Branch proposed the assumption of well site regional survey.On the basis that the geological department provided a series of appraisal well location on the same block,the survey company designed plans to investigate a series of test wells,with an aim to understand the geological structure in complex areas,define area feature and geological characteristics distribution.Through tentative use in KL3-2 Block and successful spread in other blocks,we have not only saved half month of the survey vessel's operating time,but also saved four million investigation fee,which has created a good economic benefit for company.