Application of Underwater GPS Positioning Technique in Wellhead Positioning of Liuhua 4-1 Oilfield
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Abstract
During drilling operation of the first independently operated deep water oilfield—LH4-1 Oilfield,precise positioning of underwater wellhead and precise control of the permanent guide base azimuth were needed.In order to meet this requirement,underwater GPS positioning technique was adopted,which combines water sonic and GPS positioning.long base line system and GPS positioning system were selected in the underwater positioning operation of LH4-1 through the comparison among long base line system,short base line system and ultra short base line system.Detailed precise positioning procedure with the support of underwater wireless gyro and remote operated vehicle were set up.In the positioning application in LH4-1 Oilfield development,all the requirements of precise positioning and azimuth control were satisfied.
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