水下GPS定位技术在流花4-1油田井口定位中的应用

Application of Underwater GPS Positioning Technique in Wellhead Positioning of Liuhua 4-1 Oilfield

在国内首个采用深水开发模式自营开发油田——流花4-1油田(LH4-1油田)的钻井作业中,要求对水下井口精确定位和井口导向基盘方位精确控制,为满足作业要求,采用了水下GPS定位技术。该技术利用水声相对定位技术与GPS水面高精度定位技术相结合的方式,经过比较分析水声定位技术三大系统长基线定位技术、短基线定位技术和超短基线定位技术的特点,在LH4-1油田水下井口定位作业中选用了长基线定位系统与GPS定位系统组合形成的组合定位系统,编制了水下无线罗经和水下机器人配合下水下井口精确定位及井口导向基盘控制的详细施工程序。作业后测量表明,定位精度均满足设计要求,取得了良好的实施效果,圆满解决了LH4-1油田钻井水下井口精确定位及基盘方位精确控制的难题。

During drilling operation of the first independently operated deep water oilfield--LH4-1 Oil- field, 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 sup- port of underwater wireless gyro and remote operated vehicle were set up. In the positioning application in LH4-10ilfield development, all the requirements of precise positioning and azimuth control were satisfied.